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Lucian: Lucian of Samosata was a satirist from Syria who used a distinctive tongue-in-cheek style to mock superstition, religious practices, and belief in the paranormal. He wrote all his works in ancient Greek, despite his probable native language being Syriac.

Han Yu: Han Yu was a influential figure in the Tang dynasty who was known for his essays, poetry, and government work. He greatly impacted Neo-Confucianism and was comparable to figures like Dante, Shakespeare, and Goethe in his influence on Chinese literature. Han Yu supported strong central authority and cultural orthodoxy in politics.

Murasaki Shikibu: Murasaki Shikibu, a Japanese novelist, poet, and lady-in-waiting in the Heian period, is renowned for writing The Tale of Genji, which is considered one of the world's earliest novels. Composed in Japanese between 1000 and 1012, her personal name remains unidentified, though she might have been Fujiwara no Kaoriko, mentioned as an imperial lady-in-waiting in a 1007 court diary.

Ouyang Xiu: Ouyang Xiu, a prominent figure in the Song dynasty, was a historian, calligrapher, poet, and politician. He revitalized the Classical Prose Movement and influenced future renowned writers like Su Shi and Su Zhe. He is considered the central figure of the Eight Masters of the Tang and Song.

Su Shi: Su Shi, also known as Su Dongpo, was a prominent poet, essayist, stateman, calligrapher, painter, gastronome, and travel writer during the Song dynasty. He played a crucial role in Song Dynasty politics, aligning with Sima Guang and strongly criticizing the New Policies faction led by Wang Anshi. Despite facing political exiles, Su had a successful career in bureaucracy and thrived creatively.

Giovanni Boccaccio: Giovanni Boccaccio was an Italian writer and poet who was a key figure in the European literary scene of the 14th century. He was known as "the Certaldese" due to his birthplace. Boccaccio was an important Renaissance humanist and is considered the greatest European prose writer of his time. His works were innovative and combined various literary styles and genres. He was celebrated for his experimental approach to writing.

Christine de Pizan: Christine de Pizan, an Italian-born French poet and court writer, served King Charles VI of France and various French dukes during her career.

Giacomo Casanova: Giacomo Casanova: Italian adventurer and author from Venice. His autobiography, Histoire de ma vie, provides valuable insights into European social life during the 18th century.

Miguel de Cervantes: Miguel de Cervantes Saavedra, an Early Modern Spanish writer, is widely considered the greatest writer in Spanish and one of the world's top novelists. His acclaimed novel, Don Quixote, is recognized as the first modern novel and referred to as "the first great novel of world literature". A 2002 poll of renowned authors proclaimed it the "most meaningful book of all time" among the finest works in global literary history.

Daniel Defoe: Daniel Defoe was an influential English novelist, journalist, merchant, pamphleteer, and spy. His most renowned work, Robinson Crusoe, published in 1719, is widely translated and considered a key contribution to the English novel. Defoe's political tracts and fresh ideas garnered attention from intellectuals and political leaders, even though he frequently faced legal challenges and was imprisoned at one point.

Henry Fielding: Henry Fielding was an influential English writer known for his humorous and satirical works, particularly his 1749 novel 'The History of Tom Jones'. He is considered one of the founders of the traditional English novel, along with Samuel Richardson. Additionally, Fielding played a significant role in law enforcement by establishing London's first professional police force, the Bow Street Runners, utilizing his authority as a magistrate.

Samuel Johnson: Samuel Johnson, nicknamed Dr Johnson, was an accomplished English writer known for his expertise in a wide range of fields. He made significant contributions as a poet, playwright, essayist, moralist, literary critic, sermonist, biographer, editor, and lexicographer. His impact on English literature was so profound that the Oxford Dictionary of National Biography considers him one of the most distinguished figures in the history of letters.

Michel de Montaigne: Michel de Montaigne, a prominent philosopher of the French Renaissance, is renowned for introducing and popularizing the essay genre. In his notable work Essais, he skillfully blends personal anecdotes, intellectual analysis, and autobiography. Montaigne's influence extends to countless Western writers due to his profound insights and the influential essays contained within his voluminous work.

Thomas More: Thomas More was an English lawyer, judge, philosopher, author, and statesman during the Renaissance period. He served as Lord High Chancellor of England under Henry VIII. More's notable work, Utopia, published in 1516, depicts a political system of an imaginary island. He is venerated as a saint in the Catholic Church.

Charles Perrault: Charles Perrault was a French author and member of the Académie Française. He introduced the fairy tale genre through his book Histoires ou contes du temps passé in 1697. His notable tales include "Le Petit Chaperon Rouge," "Cendrillon" ("Cinderella"), "Le Maître chat ou le Chat botté," "La Belle au bois dormant," and "Barbe Bleue" ("Bluebeard").

François Rabelais: François Rabelais, a French Renaissance humanist, was renowned as the first great French prose author and Greek scholar. He faced opposition from both John Calvin and the Catholic Church. Initially acclaimed for his profession as a physician, scholar, and diplomat, he later gained fame as a satirist for his vivid portrayals of the grotesque and larger-than-life characters.

Marquis de Sade: The Marquis de Sade, a French nobleman, was a controversial figure known for his libertine novels and activism. He was imprisoned for sex crimes, blasphemy, and pornography. His extensive body of work spanned various genres and included novels, plays, political tracts, and short stories, some of which were published anonymously or posthumously.

Jonathan Swift: Jonathan Swift was an influential Anglo-Irish satirist, author, and essayist, known as "Dean Swift" due to his position as the Dean of St Patrick's Cathedral, Dublin. He excelled in various roles, including political pamphleteer, poet, and Anglican cleric, making a significant impact on both literature and society.

Voltaire: Voltaire, born François-Marie Arouet, was a renowned French Enlightenment writer, philosopher, satirist, and historian. He criticized Christianity and slavery while advocating for freedom of speech, religion, and the separation of church and state. Known for his wit, Voltaire left a lasting impact on the Enlightenment era.

Chinua Achebe: Chinua Achebe was a Nigerian novelist, poet, and critic, considered a central figure in modern African literature. His most famous work, Things Fall Apart, is a widely studied and translated African novel. He also wrote the "African Trilogy" consisting of No Longer at Ease and Arrow of God. Achebe's later works include A Man of the People and Anthills of the Savannah. He is often regarded as the "father of African literature" in the West, although he resisted this label.

J. M. Coetzee: J. M. Coetzee, a South African and Australian author, is known for his exceptional writing in the English language. He has received numerous awards, including the Nobel Prize in Literature in 2003, twice winning the Booker Prize. Coetzee has also been honored with the CNA Literary Award three times, the Jerusalem Prize, the Prix Femina étranger, and The Irish Times International Fiction Prize. His talent extends beyond writing, as he is also a linguist and translator.

Nadine Gordimer: Nadine Gordimer, a South African writer and political activist, was awarded the Nobel Prize in Literature in 1991. Her remarkable epic writing, recognized for its immense contribution to humanity, earned her this prestigious honor.

Naguib Mahfouz: Naguib Mahfouz, an Egyptian writer, won the Nobel Prize in Literature in 1988. He is known for being one of the first contemporary Arabic writers to explore existentialism. Mahfouz published numerous novels, short stories, screenplays, op-ed columns, and plays over a 70-year career, with all of his works set in Egypt. Notably, he wrote The Cairo Trilogy and Children of Gebelawi, which have been adapted into films. His literature is considered realist with elements of existentialism.

Ben Okri: Ben Okri is a prominent Nigerian-born British poet and novelist, recognized for his contributions to postmodern and post-colonial African literature. His acclaimed novel, The Famished Road, was awarded the Booker Prize in 1991. In recognition of his literary achievements, Okri was knighted in 2023 as part of the Birthday Honours. He is often compared to esteemed authors like Salman Rushdie and Gabriel García Márquez.

Ngũgĩ wa Thiong'o: Ngũgĩ wa Thiong'o is a renowned Kenyan author and academic. He is known as "East Africa's leading novelist" and has a diverse body of work including novels, plays, short stories, and essays. Initially writing in English, he later transitioned to predominantly writing in Gikuyu. Ngũgĩ is also the founder and editor of the Gikuyu-language journal Mũtĩiri. His impactful short story, The Upright Revolution: Or Why Humans Walk Upright, has been translated into 100 languages.

Isaac Asimov: Isaac Asimov was an American writer and biochemistry professor known as one of the "Big Three" science fiction writers. He authored over 500 books, including works in various genres like science fiction, mysteries, and fantasy. Asimov's expertise extended to popular science and non-fiction writing.

Margaret Atwood: Margaret Atwood is a versatile Canadian writer known for her poetry, novels, essays, and activism. She has an extensive body of work, including 18 books of poetry, 18 novels, and 11 non-fiction books. Atwood has received numerous prestigious awards, including two Booker Prizes and the Governor General's Award. Her works have been adapted for film and television.

Saul Bellow: Saul Bellow, a Canadian-American writer, achieved remarkable recognition in the literary world. He won the Pulitzer Prize and the Nobel Prize in Literature in 1976. Bellow's remarkable accomplishments include being the only writer to secure the National Book Award for Fiction three times and receiving the National Medal of Arts. In 1990, he was also honored with the National Book Foundation's lifetime Medal for Distinguished Contribution to American Letters.

Ray Bradbury: Ray Bradbury was an acclaimed American author and screenwriter known for his diverse contribution to various genres like fantasy, science fiction, horror, mystery, and realistic fiction.

William S. Burroughs: William S. Burroughs was an influential American writer and artist associated with the Beat Generation. He is known for his postmodern literature that heavily impacted popular culture. Burroughs authored numerous novels, short stories, essays, interviews, and correspondences, often using the pen name William Lee. He collaborated with various performers and musicians, appeared in films, and created a vast collection of visual artworks, notably his acclaimed "Shotgun Art."

Raymond Chandler: Raymond Chandler, an American-British novelist and screenwriter, began writing detective fiction after losing his job during the Great Depression. He wrote his first short story in 1933 and published his first novel in 1939. Chandler wrote a total of seven novels, most of which were adapted into movies. He was elected president of the Mystery Writers of America before his death.

William Faulkner: William Faulkner was a celebrated American writer known for his novels and short stories set in the fictional Yoknapatawpha County, based on his home state of Mississippi. He is considered one of the greatest writers of Southern literature and a Nobel laureate in American literature.

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Nathaniel Hawthorne: Nathaniel Hawthorne, an American novelist and short story writer, explored themes of history, morality, and religion in his works.

Robert A. Heinlein: Robert A. Heinlein was an influential American science fiction author, engineer, and naval officer. Known as the "dean of science fiction writers," he pioneered the subgenre of hard science fiction by prioritizing scientific accuracy. Heinlein's works, encompassing fiction and non-fiction, emphasized competence, critical thinking, and often challenged social norms. His enduring influence can be seen in the science fiction genre and modern culture at large.

Ernest Hemingway: Ernest Hemingway was an influential American novelist known for his economical and understated writing style. His adventurous lifestyle and public image earned him admiration from later generations. He received the Nobel Prize in Literature in 1954. Hemingway published numerous novels, short-story collections, and nonfiction works, many of which are considered American literary classics.

Henry James: Henry James, an influential American-British author, was a vital link between literary realism and modernism. Highly acclaimed as one of the greatest English novelists, he was the son of Henry James Sr. and the sibling of philosopher William James and diarist Alice James.

Jack Kerouac: Jack Kerouac, also known as Jean-Louis Lebris de Kérouac, was an influential American novelist and poet. He played a key role in the emergence of the Beat Generation along with William S. Burroughs and Allen Ginsberg.

Stephen King: Stephen King is an American author known for his horror, supernatural fiction, crime, science-fiction, and fantasy novels. His books have sold over 350 million copies worldwide. Many of his works have been adapted into popular films, TV series, miniseries, and comic books. He has also written approximately 200 short stories and has collaborated with other authors including his friend Peter Straub and his sons Joe Hill and Owen King.

Ursula K. Le Guin: Ursula K. Le Guin was an influential American author known for her speculative fiction, particularly science fiction and the Earthsea fantasy series. Her career spanned almost six decades, during which she published over 20 novels, more than a hundred short stories, and other literary works. While she is often described as a science fiction writer, Le Guin preferred to be recognized as an American novelist, and her impact on American literature is widely acknowledged.

Jack London: Jack London, born John Griffith Chaney, was an influential American author and activist. He excelled in commercial fiction and became one of the first American writers to achieve worldwide recognition and financial success. Additionally, London made significant contributions to the development of science fiction.

H. P. Lovecraft: H. P. Lovecraft was an influential American writer known for his weird, science, fantasy, and horror fiction. He is most renowned for the creation of the Cthulhu Mythos.

Herman Melville: Herman Melville was a prominent American novelist, poet, and short story writer in the American Renaissance period. His notable works include Moby-Dick, Typee, and Billy Budd, Sailor. Although he was not well-known during his lifetime, a revival of his works began in 1919, with Moby-Dick being regarded as one of the great American novels.

Toni Morrison: Toni Morrison, born Chloe Anthony Wofford, was an influential American novelist. Her notable works include The Bluest Eye (1970), Song of Solomon (1977), which garnered critical acclaim, and Beloved (1987), for which she won both the Pulitzer Prize and the Nobel Prize in Literature in 1988 and 1993, respectively.

Edgar Allan Poe: Edgar Allan Poe was an influential American writer known for his poetry and short stories on mystery and the macabre. He is considered a central figure of Romanticism, Gothic fiction, and American literature. Poe pioneered the short story and is credited with inventing the detective fiction and contributing to science fiction. Despite his literary success, he faced financial hardships throughout his life.

Ayn Rand: Ayn Rand, the pen name of Alice O'Connor, was a Russian-born American author and philosopher who developed the Objectivism philosophy. She gained fame with her novels "The Fountainhead" and "Atlas Shrugged," and later focused on promoting her philosophy through non-fiction writings. Rand's work continues to be influential in the fields of literature and philosophy.

Upton Sinclair: Upton Sinclair was an influential American writer, activist, and political nominee who wrote nearly 100 books and received the Pulitzer Prize for Fiction in 1943. His work was widely popular and he was known for being a muckraker, addressing social issues of his time. Sinclair also ran for governor of California in 1934 as a Democratic Party nominee.

John Steinbeck: John Steinbeck was an acclaimed American writer known for his realistic and imaginative works. He won the Nobel Prize in Literature in 1962 for his ability to blend sympathetic humor and keen social perception. Steinbeck is widely regarded as a significant figure in American literature.

Mark Twain: Mark Twain, or Samuel Langhorne Clemens, was a great American writer known for his humor and satire. He wrote famous novels like The Adventures of Tom Sawyer and Adventures of Huckleberry Finn, which is often called the "Great American Novel". He also wrote A Connecticut Yankee in King Arthur's Court and Pudd'nhead Wilson, and co-wrote The Gilded Age: A Tale of Today. Twain was hailed as the "greatest humorist" in the United States and is considered the "father of American literature".

Kurt Vonnegut: Kurt Vonnegut, an influential American writer, captivated readers with satirical and darkly humorous novels. Throughout his prolific 50-year career, he authored fourteen novels, three short-story collections, five plays, and five nonfiction works. Even after his passing, additional collections of his work have been published.

Edith Wharton: Edith Wharton was an American writer and designer known for her realistic portrayal of the lives and morals of New York's upper-class during the Gilded Age. She was the first woman to win the Pulitzer Prize in Fiction in 1921 for her novel The Age of Innocence. Wharton's works also include The House of Mirth, Ethan Frome, and notable ghost stories.

Jorge Amado: Jorge Amado was a prominent Brazilian writer known for his modernist works. His writing has been translated into 49 languages and adapted into films like "Dona Flor and Her Two Husbands." Amado's literature showcases a diverse Brazil, with influences of religious syncretism. Despite highlighting social and economic disparities, his work portrays a vibrant and hopeful nation.

Machado de Assis: Machado de Assis, also known as Joaquim Maria Machado de Assis, was a renowned Brazilian novelist, poet, playwright, and short story writer. He is considered the most prominent figure in Brazilian literature and was the first President of the Brazilian Academy of Letters, which he founded in 1897. He was a polyglot, mastering French, English, German, and Greek later in his life.

Jorge Luis Borges: Jorge Luis Borges, an Argentine writer, was a key figure in Spanish-language and international literature. His famous collections, Ficciones and El Aleph, delve into themes of dreams, labyrinths, chance, infinity, and mythology while also contributing to philosophical literature and the fantasy genre. Borges had a significant influence on the magic realist movement in 20th century Latin American literature.

Alejo Carpentier: Alejo Carpentier, a Cuban novelist, essayist, and musicologist, greatly influenced Latin American literature during the "boom" period. Despite being born in Switzerland, he strongly identified as Cuban. He traveled extensively and took an interest in Latin American politics, aligning himself with revolutionary movements such as Fidel Castro's Communist Revolution. Carpentier was jailed and exiled for his leftist political philosophies.

Carlos Fuentes: Carlos Fuentes was a renowned Mexican novelist and essayist. His notable works include The Death of Artemio Cruz, Aura, Terra Nostra, The Old Gringo, and Christopher Unborn. Fuentes was considered one of the most admired writers in the Spanish-speaking world and a prominent figure in the Latin American Boom. He was Mexico's most celebrated novelist and received prestigious literary honors such as the Miguel de Cervantes Prize. Although frequently mentioned as a potential Nobel laureate, Fuentes never won the coveted prize.

Gabriel García Márquez: Gabriel García Márquez, known as Gabo or Gabito, was a Colombian novelist, journalist, and screenwriter. His self-directed education led him from law school to a career in journalism. He gained recognition as one of the most important authors of the 20th century, particularly in Spanish literature. García Márquez was honored with the 1972 Neustadt International Prize for Literature and the 1982 Nobel Prize in Literature. He fearlessly criticized both Colombian and foreign politics. He married Mercedes Barcha Pardo in 1958 and they had two sons, Rodrigo and Gonzalo.

Mario Vargas Llosa: Mario Vargas Llosa is a Peruvian novelist, essayist, journalist, and former politician. He is regarded as one of Latin America's most important writers and has had a significant global impact. In 2010, he won the Nobel Prize in Literature for his exploration of power structures and portrayals of resistance and defeat. He has also received numerous other prestigious awards. In 2021, he was elected to the Académie française.

Chinghiz Aitmatov: Chinghiz Aitmatov was a prominent Kyrgyz author known for his works in both Russian and Kyrgyz languages. He is highly recognized in Kyrgyzstan's literature.

Ryūnosuke Akutagawa: Ryūnosuke Akutagawa, also known as Chōkōdō Shujin, was a prominent Japanese writer during the Taishō period. He is considered the pioneer of the Japanese short story and is honored through the prestigious Akutagawa Prize. Sadly, he tragically ended his life at the age of 35 by overdosing on barbital.

Jin Yong: Jin Yong, pen name of Louis Cha Leung-yung, was a renowned Chinese novelist and essayist. He co-founded the Hong Kong newspaper Ming Pao and served as its first editor-in-chief. Known as Hong Kong's most famous writer, he is considered one of the "Three Legs of the Tripod of Wuxia," along with Gu Long and Liang Yusheng. Jin Yong is also recognized as one of the "Four Great Talents of Hong Kong."

Yasunari Kawabata: Yasunari Kawabata, a Japanese novelist and short story writer, was awarded the Nobel Prize in Literature in 1968. His acclaimed works are known for their spare, lyrical prose and subtle storytelling. He was the first Japanese author to receive this prestigious honor. Kawabata’s works continue to have a global influence and remain popular to this day.

Lao She: Lao She, pen name of Shu Qingchun, was a Chinese novelist and dramatist known for his 20th-century works. His novel Rickshaw Boy and play Teahouse are renowned. Lao She, of Manchu ethnicity, was acclaimed for his vivid use of the Beijing dialect.

Lu Xun: Lu Xun, born Zhou Shuren, was a prominent Chinese writer, critic, and state servant. He was a leading figure in modern Chinese literature and proficient in both vernacular and classical Chinese. Lu Xun was a versatile author, contributing as a short story writer, editor, translator, critic, essayist, poet, and designer. In the 1930s, he served as the head of the League of Left-Wing Writers in Shanghai, during the republican-era China.

Yukio Mishima: Yukio Mishima, the pen name of Kimitake Hiraoka, was a prominent Japanese author, poet, playwright, actor, and model. He also had a strong affiliation with Shintoism and nationalism and founded a group called Tatenokai. Mishima is highly regarded as one of the significant 20th-century writers, although he was never awarded the Nobel Prize in Literature despite being considered five times. His works, such as "Confessions of a Mask" and "The Temple of the Golden Pavilion," combine traditional Japanese and modern Western literary styles, using an extravagant vocabulary and decadent metaphors. Mishima explored the interplay of beauty, eroticism, and death with an obsessive intensity.

Haruki Murakami: Haruki Murakami is a highly acclaimed Japanese writer known for his bestselling novels, essays, and short stories that have been translated into 50 languages and sold millions of copies worldwide. He has received numerous prestigious awards, including the Gunzo Prize for New Writers, the World Fantasy Award, the Frank O'Connor International Short Story Award, the Franz Kafka Prize, the Jerusalem Prize, and the Princess of Asturias Awards.

Natsume Sōseki: Natsume Sōseki, a renowned Japanese novelist and scholar of British literature, is best known for his novels Kokoro, Botchan, I Am a Cat, Kusamakura, and the unfinished Light and Darkness. He also wrote haiku, kanshi poetry, and fairy tales.

Kenzaburō Ōe: Kenzaburō Ōe, a prominent Japanese writer, explored political, social, and philosophical themes in his influential novels, short stories, and essays. Influenced by French and American literature, he delved into issues such as nuclear weapons, non-conformism, and existentialism. In 1994, Ōe received the Nobel Prize in Literature for his creation of a thought-provoking world that confronts the complexities of the human condition.

Orhan Pamuk: Orhan Pamuk is a Turkish novelist, screenwriter, and academic. He won the Nobel Prize in Literature in 2006 and is one of Turkey's most prominent writers. He has sold over 13 million books in 63 languages, making him the country's best-selling author.

Premchand: Premchand, also known as Munshi Premchand, was a renowned Indian writer famous for his modern Hindustani literature. He was a pioneer in Hindi and Urdu social fiction, highlighting caste hierarchies and the hardships faced by women and laborers in the late 1880s society. He is regarded as one of the foremost Hindi writers of the early twentieth century. Some of his notable works include Godaan, Karmabhoomi, Gaban, Mansarovar, Idgah, and his first collection of short stories published in 1907 called Soz-e-Watan.

Joseph Conrad: Joseph Conrad was a renowned Polish-British novelist known for his mastery of prose. Despite learning English later in life, he is considered one of the greatest English language writers. Conrad's novels and stories often featured nautical settings and explored the existential struggles of individuals in a chaotic and morally ambiguous world.

Ismail Kadare: Ismail Kadare is a renowned Albanian novelist, poet, essayist, screenwriter, and playwright. Initially a poet, he gained international fame with the publication of his first novel, The General of the Dead Army. He is considered a significant literary and intellectual figure globally.

Henryk Sienkiewicz: Henryk Sienkiewicz, a notable Polish writer, gained recognition for his epic historical novels, including the popular Trilogy series. His internationally acclaimed masterpiece, Quo Vadis (1896), remains his most renowned work.

Elie Wiesel: Elie Wiesel was an influential Romanian-American writer and professor. He survived the Holocaust and wrote extensively about his experiences, particularly in his book Night. Esteemed as a Nobel laureate, he authored 57 books in English and French.

Hans Christian Andersen: Hans Christian Andersen, a Danish author, was renowned for his fairy tales. He wrote a diverse range of literature, including plays, travelogues, novels, and poems. However, it is his literary fairy tales that endure as his most memorable works.

Karen Blixen: Karen Blixen, a Danish author, wrote in Danish and English. She used pen names such as Isak Dinesen, Tania Blixen, Osceola, and Pierre Andrézel.

Knut Hamsun: Knut Hamsun, a Nobel Prize-winning Norwegian writer, had a versatile career spanning over 70 years. His extensive body of work consisted of over 23 novels, poetry, short stories, plays, non-fiction, essays, and a travelogue. Hamsun's writings showcased a range of perspectives, consciousness, subjects, and environments.

Selma Lagerlöf: Selma Lagerlöf was a Swedish writer who achieved several notable firsts. She published her debut novel, Gösta Berling's Saga, at 33 and became the first woman to win the Nobel Prize in Literature in 1909. Moreover, she was granted membership in the Swedish Academy in 1914, making her the first woman to be recognized by this prestigious institution.

Halldór Laxness: Halldór Laxness was an Icelandic writer and Nobel laureate known for his diverse body of work, which included novels, poetry, articles, essays, plays, travelogues, and short stories. Influenced by writers like Strindberg, Freud, Hamsun, Lewis, Sinclair, Brecht, and Hemingway, Laxness's contributions to literature were recognized with the Nobel Prize in Literature in 1955.

Astrid Lindgren: Astrid Lindgren was a renowned Swedish writer of fiction and screenplays. She is famous for her children's book series like Pippi Longstocking and Emil of Lönneberga. Lindgren worked at a publishing house and wrote over 30 books for children. She is recognized as the world's 18th most translated author and has sold approximately 167 million books worldwide. Lindgren received the Right Livelihood Award for her dedication to children's rights and her opposition to corporal punishment. She also campaigned for animal welfare, which led to the creation of a new law called Lex Lindgren.

Mikhail Bulgakov: Mikhail Bulgakov was a prominent Russian writer, doctor, and playwright in the early 20th century. His most notable work, The Master and Margarita, is considered one of the greatest novels of the 20th century.

Ivan Bunin: Ivan Bunin, a Russian writer, was the first to win the Nobel Prize for Literature. He excelled in maintaining classical Russian traditions in his prose and poetry, known for their artistic finesse. His writings are recognized for their rich texture, often referred to as "Bunin brocade," making his works highly regarded in Russian literature.

Fyodor Dostoevsky: Fyodor Dostoevsky, a Russian writer, is widely recognized as a renowned novelist and influential figure in world literature. His literary genius is acknowledged by critics, as his works are considered influential masterpieces.

Maxim Gorky: Maxim Gorky, also known as Alexei Maximovich Peshkov, was a prominent Russian and Soviet writer, political thinker, and advocate of socialism. He had a remarkable career, with five nominations for the Nobel Prize in Literature. Before his success as an author, Gorky traveled extensively throughout the Russian Empire, taking on various jobs that would greatly shape his later writing.

Mikhail Lermontov: Mikhail Lermontov was a prominent Russian Romantic writer, poet, and painter, known as "the poet of the Caucasus." Considered the most significant figure in Russian Romanticism after Alexander Pushkin, his influence on later Russian literature is still evident today. Lermontov's contributions extend beyond poetry, as his prose established the foundation for the Russian psychological novel tradition.

Vladimir Nabokov: Vladimir Nabokov was a renowned Russian-American novelist, translator, poet, and entomologist. He gained recognition for his works written in both Russian and English. Born in Imperial Russia in 1899, he wrote his early novels in Russian while living in Berlin, and later achieved international acclaim after moving to the United States in 1940. Nabokov became an American citizen in 1945 and settled in Montreux, Switzerland in 1961.

Mikhail Sholokhov: Mikhail Sholokhov, a Russian novelist, was awarded the Nobel Prize in Literature in 1965. His writing centered on the Don Cossacks' experiences during the Russian Revolution, the civil war, and collectivization. His renowned work is the novel "And Quiet Flows the Don."

Aleksandr Solzhenitsyn: Aleksandr Solzhenitsyn, a renowned Russian writer and dissident, played a crucial role in shedding light on political repression in the Soviet Union, particularly the Gulag prison system.

Leo Tolstoy: Leo Tolstoy, a renowned Russian writer, is widely considered one of the most influential authors in history. He was nominated multiple times for the Nobel Prize in Literature and also for the Nobel Peace Prize.

Ivan Turgenev: Ivan Turgenev was a Russian writer known for his novels, short stories, and plays. He also translated and promoted Russian literature in the West.

Honoré de Balzac: Honoré de Balzac, a renowned French novelist and playwright, is best known for his masterpiece La Comédie humaine, a series of novels that provide a wide-ranging depiction of post-Napoleonic French society.

Albert Camus: Albert Camus was a notable French philosopher, author, and political activist. At just 44 years old, he became the second-youngest recipient of the Nobel Prize in Literature in 1957. His renowned works, including The Stranger, The Plague, and The Myth of Sisyphus, delve into existentialist themes and human condition.

Alexandre Dumas: Alexandre Dumas, born in 1802 and died in 1870, was a renowned French author known as Alexandre Dumas père. He made his mark as a novelist and playwright.

Umberto Eco: Umberto Eco, an Italian academic and writer, was renowned for his wide-ranging intellectual pursuits. He was a medievalist, philosopher, semiotician, novelist, cultural critic, and political and social commentator. His best-known works include the popular 1980 novel "The Name of the Rose," which skillfully combined semiotics, biblical analysis, medieval studies, and literary theory in a historical mystery setting. Eco’s 1988 novel "Foucault's Pendulum" also explored similar themes, showcasing his talent for weaving complex ideas into gripping narratives.

Gustave Flaubert: Gustave Flaubert, a renowned French novelist, is considered a prominent figure in literary realism. He achieved formal perfection in his realistic works, highlighting the value of style in presenting reality objectively. Flaubert's notable contributions include his debut novel Madame Bovary, his extensive correspondence, and his dedication to style and aesthetics. He also mentored the celebrated short story writer Guy de Maupassant.

Anne Frank: Anne Frank was a German Jewish girl who wrote a diary during the Nazi occupation of the Netherlands. Her powerful diary about hiding from 1942 to 1944 was published after her death and became a globally recognized book, inspiring plays and films. She remains one of the most notable Holocaust victims, providing a deeply personal account of everyday life in hiding.

André Gide: André Gide was a renowned French author who wrote extensively in various styles and subjects. His works received critical acclaim, leading him to receive the Nobel Prize in Literature in 1947. Gide's career spanned from his involvement in the symbolist movement to his outspoken criticism of imperialism during the interwar period. With over fifty published books, he was considered by many as "France's greatest contemporary man of letters" and the most significant French writer of the 20th century.

Brothers Grimm: The Brothers Grimm, Jacob and Wilhelm, were German academics who collected and published folklore. They are famous for popularizing well-known folktales such as "Cinderella", "Hansel and Gretel", and "Snow White". Their first collection, Children's and Household Tales, was published in 1812.

Victor Hugo: Victor Hugo, a French Romantic writer and politician, had a diverse literary career spanning over 60 years, during which he wrote in various genres and forms.

Franz Kafka: Franz Kafka, a German-speaking Bohemian Jewish author from Prague, is considered a major figure in 20th-century literature. His work combines realism and the fantastic, featuring isolated protagonists facing surreal predicaments and incomprehensible societal powers. Themes of alienation, existential anxiety, guilt, and absurdity are explored in his writing. Notable works include The Metamorphosis, The Trial, and The Castle. The term "Kafkaesque" describes absurd situations like those depicted in his works.

Thomas Mann: Thomas Mann was a German novelist and social critic who won the Nobel Prize in Literature in 1929. He wrote epic novels and novellas that explored the psychology of artists and intellectuals. Mann used symbolism and irony, drawing inspiration from German and Biblical stories, as well as the ideas of Goethe, Nietzsche, and Schopenhauer.

Guy de Maupassant: Guy de Maupassant was a renowned French author in the 19th century known for his expertise in short story writing. He was considered a representative of the naturalist school, portraying human lives, destinies, and social forces with a disillusioned and often pessimistic perspective.

Marcel Proust: Marcel Proust was a French novelist known for his influential work, À la recherche du temps perdu. Published in seven volumes between 1913 and 1927, it is considered a monumental novel of the 20th century. Proust's literary genius has earned him recognition as one of the most influential authors by critics and writers.

José Saramago: José Saramago (1922-2010) was a Portuguese novelist and recipient of the 1998 Nobel Prize in Literature. He overcame poverty to educate himself and worked various jobs while pursuing his literary career. Known for his imaginative and compassionate storytelling, his works often offer subversive perspectives on historical events. Saramago's distinctive narrative style and his ability to blend wisdom and ignorance have earned him a place in the Western canon of literature.

Stendhal: Stendhal, a 19th-century French writer, is famous for his novels Le Rouge et le Noir and La Chartreuse de Parme. He is highly respected for his insightful analysis of characters' psychology and is considered an early practitioner of realism. Stendhal also introduced his self-proclaimed egotism concept known as "Beylism" into his characters.

Jules Verne: Jules Verne was a French writer known for his adventure novels, including "Journey to the Center of the Earth," "Twenty Thousand Leagues Under the Seas," and "Around the World in Eighty Days." He collaborated with Pierre-Jules Hetzel and created the popular series called Voyages extraordinaires. Verne's well-documented novels are set in the late 19th century, incorporating technological advancements of the time.

Émile Zola: Émile Zola was a renowned French novelist, journalist, and playwright known for his naturalistic writing style. He played a significant role in the political liberalization of France and was instrumental in the exoneration of Alfred Dreyfus, a wrongfully accused army officer. Zola was also a two-time nominee for the Nobel Prize in Literature in 1901 and 1902.

Jane Austen: Jane Austen was an influential English novelist known for her six novels that critiqued the British landed gentry in the late 18th century. Her works explored women's reliance on marriage for social status and economic stability, while also critiquing the sentimental novels of the time. Austen's skilled use of social commentary, realism, and biting irony has earned her widespread acclaim among critics and scholars.

Enid Blyton: Enid Blyton was a highly successful English children's writer known for selling over 600 million books worldwide. Her works have been translated into 90 languages, leading her to be ranked as the 4th most translated author as of June 2019. Blyton's writings covered various genres such as education, natural history, fantasy, mystery, and biblical narratives. Her most famous book series include Noddy, Famous Five, Secret Seven, the Five Find-Outers, and Malory Towers, although she also authored many others like St. Clare's, The Naughtiest Girl, and The Faraway Tree series.

Brontë family: The Brontë family, famous for their literary contributions in the 19th century, hailed from Thornton and later resided in Haworth, Yorkshire, England. Comprised of Charlotte, Emily, and Anne, the sisters gained recognition as poets and novelists. To navigate gender biases, they adopted male pseudonyms when publishing their works. Their stories immediately captivated readers with their passion and originality. While Charlotte's novel "Jane Eyre" achieved early success, Emily's "Wuthering Heights," Anne's "The Tenant of Wildfell Hall," and other works were acclaimed as literary masterpieces posthumously.

Lewis Carroll: Lewis Carroll, born Charles Lutwidge Dodgson, was a renowned English author, mathematician, poet, and photographer. His famous works include Alice's Adventures in Wonderland and Through the Looking-Glass. Carroll's talent lay in word play, logic, and fantasy, which were evident in his notable poems Jabberwocky and The Hunting of the Snark, both classified as literary nonsense.

Agatha Christie: Agatha Christie, a famous English writer, is known for her 66 detective novels and 14 short story collections featuring Hercule Poirot and Miss Marple. She also wrote the long-running play, The Mousetrap. Christie is considered the "Queen of Crime" and has sold over two billion copies of her novels, making her the best-selling fiction writer of all time.

Arthur C. Clarke: Arthur C. Clarke was an English writer known for his science fiction works, as well as his skills as a scientist, inventor, undersea explorer, and television host.

Roald Dahl: Roald Dahl, a British author, wrote popular children's literature, short stories, and poetry. He was also a screenwriter and a successful fighter pilot during wartime. His books have sold over 300 million copies worldwide, making him one of the greatest storytellers for children in the 20th century.

Charles Dickens: Brief summary: Charles Dickens, an English novelist and social critic, is considered the greatest novelist of the Victorian era. He created famous fictional characters and his works became immensely popular during his lifetime. Today, he is recognized as a literary genius and his novels and short stories are still widely read.

Arthur Conan Doyle: Arthur Conan Doyle, a British writer and physician, is renowned for creating Sherlock Holmes in 1887. Holmes and his trusty sidekick Dr. Watson feature in four novels and fifty-six short stories, and are considered pivotal in the crime fiction genre.

George Eliot: George Eliot, the pen name of Mary Ann Evans, was a prominent Victorian novelist and poet from England. Known for her realistic and insightful writings, she created seven novels including Adam Bede, The Mill on the Floss, and Middlemarch. Her works often originated from provincial England and skillfully portrayed the countryside, while offering a deep understanding of psychology and the environment.

William Golding: William Golding was a British writer who gained recognition for his debut novel Lord of the Flies in 1954. He wrote a total of twelve fiction novels, receiving accolades like the Booker Prize in 1980 for Rites of Passage. Golding was also honored with the Nobel Prize in Literature in 1983.

Thomas Hardy: Thomas Hardy, an English novelist and poet in the Victorian era, was influenced by Romanticism and the works of William Wordsworth. He criticized the declining status of rural people in Britain, particularly in his native South West England.

Kazuo Ishiguro: Kazuo Ishiguro is a highly acclaimed British novelist, screenwriter, musician, and short-story writer. He received the 2017 Nobel Prize in Literature for his emotionally powerful novels, which explore the deceptive nature of our perceived connection with the world.

James Joyce: James Joyce was an influential Irish novelist known for his contributions to the modernist avant-garde movement. His novel Ulysses paralleled episodes from Homer's Odyssey using innovative literary styles like stream of consciousness. Other notable works include the short-story collection Dubliners, the novel A Portrait of the Artist as a Young Man, and the complex Finnegans Wake. Joyce's writings also encompassed poetry, a play, letters, and occasional journalism.

Rudyard Kipling: Rudyard Kipling was an influential English writer and journalist. Born in British India, his surroundings greatly influenced his literary works, which include novels, short stories, and poems.

D. H. Lawrence: D. H. Lawrence: English writer known for modernist works exploring modernity, social alienation, and industrialization. Famous novels like Sons and Lovers, The Rainbow, Women in Love, and Lady Chatterley's Lover faced censorship trials due to their explicit language and radical portrayals of sexuality.

C. S. Lewis: Clive Staples Lewis, a British writer and theologian, taught English literature at Oxford and Cambridge. Known for The Chronicles of Narnia, Lewis also wrote The Screwtape Letters and The Space Trilogy. His non-fiction works include Mere Christianity, Miracles, and The Problem of Pain, focusing on Christian apologetics.

V. S. Naipaul: V. S. Naipaul was a Trinidadian-born British writer known for his comic early novels set in Trinidad and his bleaker novels of alienation in the wider world. He published over thirty books in fifty years and was admired for his prose, although his controversial views sparked controversy.

George Orwell: George Orwell, born Eric Arthur Blair, was an influential English writer known for his lucid prose, social criticism, and opposition to totalitarianism. He wrote under the pseudonym George Orwell and his work often supported democratic socialism.

Salman Rushdie: Salman Rushdie is an Indian-born British-American novelist known for his works that blend magic realism and historical fiction. His stories explore the connections and migrations between Eastern and Western civilizations, often set on the Indian subcontinent. His novel, Midnight's Children, won the prestigious Booker Prize in 1981 and was recognized as the best novel in the award's history on multiple anniversaries.

Walter Scott: Walter Scott, a Scottish historian, novelist, poet, and playwright, was a renowned figure in European and Scottish literature. His notable works include the novels Ivanhoe, Rob Roy, Waverley, Old Mortality, The Heart of Mid-Lothian, and The Bride of Lammermoor, along with the narrative poems Marmion and The Lady of the Lake. Scott's writings had a significant influence on both European and American literature.

Mary Shelley: Mary Shelley, an English novelist, wrote the Gothic novel Frankenstein, an early example of science fiction. She edited and promoted the works of her husband, Romantic poet Percy Bysshe Shelley. Her parents were political philosopher William Godwin and women's rights advocate Mary Wollstonecraft.

Robert Louis Stevenson: Robert Louis Stevenson was a Scottish writer known for his novels, poems and travel writings. His notable works include Treasure Island, Dr Jekyll and Mr Hyde, Kidnapped, and A Child's Garden of Verses.

J. R. R. Tolkien: J. R. R. Tolkien, an English writer and philologist, is known for his high fantasy novels The Hobbit and The Lord of the Rings.

H. G. Wells: H. G. Wells was a highly accomplished English writer known for his diverse range of works, including over 50 novels and numerous short stories. He covered various genres, including science fiction, along with social commentary, politics, history, popular science, satire, biography, and autobiography. His science fiction novels are considered exceptional, earning him the title "father of science fiction."

Virginia Woolf: Virginia Woolf was a pioneering English writer who is considered one of the most significant modernist authors of the 20th century. She revolutionized storytelling by introducing the use of stream of consciousness as a narrative technique.

Patrick White: Patrick White was an Australian writer who wrote 12 novels, 3 short-story collections, and 8 plays from 1935 to 1987.

Kalidasa: Kalidasa was a renowned Classical Sanskrit author and playwright during the Gupta era. He drew inspiration from Hindu Puranas and philosophy to create three plays, two epic poems, and two shorter poems.

Qu Yuan: Qu Yuan, a patriotic Chinese poet and aristocrat from the State of Chu, was influential during the Warring States period. He made significant contributions to classical poetry, mainly through his poems in the Chu Ci anthology. Alongside the Shi Jing, it is one of the most celebrated collections of ancient Chinese verse. Qu Yuan's association with the Dragon Boat Festival is also notable.

Catullus: Catullus, a Latin poet of the late Roman Republic, wrote in a personal and modern style, rather than focusing on classical heroes. His works, which are widely read, continue to influence poetry and other art forms.

Hesiod: Hesiod, an ancient Greek poet, lived around the same time as Homer and is considered the first written poet to have a personal role in his work. He, along with Homer, shaped Greek religious practices. Hesiod is regarded by modern scholars as a significant source on Greek mythology, farming, economics, astronomy, and time-keeping.

Homer: Homer, a Greek poet, is known for crafting the Iliad and the Odyssey, both foundational works of ancient Greek literature. He is highly respected and considered an immensely influential author in history.

Horace: Horace, or Quintus Horatius Flaccus, was a prominent Roman lyric poet during the reign of Augustus. His Odes were highly regarded by Quintilian, a rhetorician, as the most worthwhile Latin lyrics, praising Horace's ability to be both lofty and charming, graceful and versatile in his word choice.

Ovid: Ovid, also known as Publius Ovidius Naso, was a Roman poet who lived during the reign of Augustus. He is considered one of the three major poets of Latin literature, along with Virgil and Horace. Despite his popularity, Ovid was exiled by Augustus to Tomis, where he spent the last nine or ten years of his life. The specifics of his banishment remain a mystery, leading to much speculation among scholars.

Sappho: Sappho, an ancient Greek poet from Lesbos, was revered as one of the greatest lyric poets. She wrote poetry meant to be sung with music, but most of her work is lost, with only fragments remaining. Sappho was praised as the "Tenth Muse" and "The Poetess", and her only complete poem is the Ode to Aphrodite. Besides lyric poetry, she was said to have written elegiac and iambic poetry. Some surviving epigrams imitate Sappho's style, but they were created during Hellenistic times.

Virgil: Virgil, or Publius Vergilius Maro, was an ancient Roman poet of the Augustan period, known for his famous Latin literature works. These include the Eclogues, Georgics, and the epic Aeneid. While some minor poems in the Appendix Vergiliana were once attributed to him, modern scholars doubt his authorship of these.

Abu Nuwas: Abu Nuwas was an influential classical Arabic poet known for his modern style of poetry during the early years of the Abbasid Caliphate. He is also recognized in folkloric traditions and is mentioned multiple times in the famous collection, One Thousand and One Nights.

Bai Juyi: Bai Juyi, also known as Letian, was a prominent figure in the Tang dynasty. He was a musician, poet, and politician, serving as a governor in multiple provinces. His poems often revolved around his personal experiences and everyday life observations. Bai Juyi gained fame for his simplistic and widely appreciated writing style, which had a significant influence in East Asia during medieval times.

Du Fu: Du Fu, a renowned Chinese poet and politician in the Tang dynasty, is widely regarded as one of the greatest Chinese poets, along with his friend Li Bai. He aspired to be a successful civil servant but faced difficulties in achieving this goal. Unfortunately, his life, similar to the rest of China, was severely affected by the An Lushan Rebellion in 755, leading to fifteen tumultuous years of unrest.

Ferdowsi: Ferdowsi, also known as Abul-Qâsem Ferdowsi Tusi or Firdawsi, was an influential Persian poet who authored Shahnameh, an epic poem considered the greatest in Persian-speaking countries. As one of the most celebrated figures in Persian literature and history, Ferdowsi has left an enduring impact as a talented poet and storyteller.

Hafez: Hafez, also known as Khwāje Shams-od-Dīn Moḥammad Ḥāfeẓ-e Shīrāzī, was a renowned Persian lyric poet. His collected works are considered to be among the highest achievements in Persian literature. Hafez's poems are cherished by many Iranians, who memorize them and use them as everyday proverbs. His life, poems, and interpretations have significantly influenced Persian writing since the 14th century.

Jami: Jami, also known as Nūr ad-Dīn 'Abd ar-Rahmān Jāmī, was a prominent Sunni poet and scholar of Sufi literature. He was an eloquent poet-theologian of the school of Ibn Arabi and a member of the Naqshbandi Sufi order. Jami's notable works include Haft Awrang, Tuhfat al-Ahrar, and Layla wa Majnun. He is recognized for his analysis of the metaphysics of mercy and his contribution to mystical writings.

Omar Khayyam: Omar Khayyam, born in Nishapur, was a Persian polymath known for his contributions to mathematics, astronomy, philosophy, and poetry. He lived during the rule of the Seljuk dynasty and resided in the capital of the empire, Nishapur.

Amir Khusrau: Amir Khusrau, also known as Amīr Khusrau, was a renowned Indo-Persian Sufi singer, musician, poet, and scholar. He lived during the Delhi Sultanate era.

Li Bai: Li Bai, also known as Li Bo, was a renowned poet in the Tang dynasty and is considered one of the greatest poets in Chinese history. Alongside his friend and fellow poet Du Fu, they contributed to the flourishing era of Chinese poetry during the Tang dynasty, often referred to as the "Golden Age of Chinese Poetry." The "Three Wonders" encompass Li Bai's poetry, Pei Min's swordplay, and Zhang Xu's calligraphy.

Nizami Ganjavi: Nizami Ganjavi, also known as Nizami or Nezāmi, was a renowned 12th-century Muslim poet. He is celebrated as the greatest romantic epic poet in Persian literature, bringing a colloquial and realistic style to the Persian epic. His influence is cherished and embraced by Afghanistan, the Republic of Azerbaijan, Iran, the Kurdistan region, and Tajikistan.

Rudaki: Rudaki was a renowned poet, singer, and musician, known as the first prominent writer in New Persian. He served as a court poet for the Samanids and is believed to have written over 180,000 verses. Sadly, only a fraction of his work remains, including a section of his adaptation of the Indian fable collection, Kalila wa-Dimna.

Rumi: Rumi, also known as Jalāl al-Dīn Muḥammad Rūmī, was a prominent 13th-century Persian poet, Islamic scholar, and Sufi mystic from Greater Khorasan in Iran. He was not only a Hanafi faqih and Maturidi theologian but also a highly revered figure in the field of Islamic spirituality.

Saadi Shirazi: Saadi Shirazi, also known as Saadi, was a renowned Persian poet and prose writer in the medieval era. He is admired for the excellence of his works and his profound insights into society and ethics.

Tao Yuanming: Tao Yuanming, also known as Tao Qian, was a Chinese poet and politician. He lived during the Six Dynasties period and was famous for his poems reflecting on the joys and challenges of life. Tao lived a simple life in the countryside, farming, reading, and writing poetry. He was seen as a recluse during the Tang dynasty and praised for his authenticity and spontaneity in poetry. Tao's work was included in a 6th-century literary anthology, showing recognition in his own era. He became known as a representative of Fields and Gardens poetry, finding inspiration in the natural world. Tao Yuanming is depicted in the Wu Shuang Pu by Jin Guliang.

Wang Wei (Tang dynasty): Wang Wei, a prominent figure in the Tang dynasty, was a talented musician, painter, poet, and politician. He is highly revered for his remarkable contributions to arts and literature during his time. His poetry, reflecting the beauty of the local surroundings, remains preserved, with 29 of his exquisite works included in the renowned anthology Three Hundred Tang Poems.

Geoffrey Chaucer: Geoffrey Chaucer was an English poet and author, known for The Canterbury Tales. He is often referred to as the "father of English literature" or "father of English poetry". He was the first writer buried in Poets' Corner at Westminster Abbey. Chaucer was also a philosopher, astronomer, and civil servant, serving as a bureaucrat, courtier, diplomat, and member of parliament. He even wrote a scientific treatise on the astrolabe for his young son.

Dante Alighieri: Dante Alighieri, a renowned Italian poet, writer, and philosopher, is best known for his masterpiece Divine Comedy. This epic poem, originally named Comedìa and later titled Divina, is regarded as a significant work from the Middle Ages and a pinnacle of Italian literature.

Petrarch: Petrarch, or Francesco Petrarca, was an influential Italian Renaissance scholar and poet. He is considered one of the earliest humanists, emphasizing the value of human achievements and knowledge.

Chrétien de Troyes: Chrétien de Troyes was a French poet and troubadour who wrote popular Arthurian tales like Gawain, Lancelot, Perceval, and the Holy Grail. His renowned chivalric romances, including Erec and Enide, Lancelot, Perceval, and Yvain, are highly regarded in medieval literature. Notably, his structural innovations in Yvain are considered influential in the development of the modern novel.

François Villon: François Villon, a renowned French poet of the Late Middle Ages, gained fame for his criminal activities and numerous brushes with the law. His poems depict his personal encounters with law enforcement, making them a reflection of his life experiences.

Fuzuli (poet): Fuzuli, a renowned 16th-century poet, wrote in Azerbaijani, Persian, and Arabic. His works made significant contributions to Turkic, Azerbaijani, and Ottoman literature. Fuzuli's fame extended throughout the Turkic cultural landscape, reaching Central Asia and India from the 16th to the 19th centuries.

Kabir: Kabir, an Indian mystic poet and saint, greatly influenced the Bhakti movement in Hinduism. His verses are included in the Sikh scripture Guru Granth Sahib and other sacred texts. Today, Kabir's poems are cherished and sung by Hindus, Sikhs, and Muslims, particularly Sufis.

Matsuo Bashō: Matsuo Bashō was a renowned poet in Japan's Edo period, recognized as the greatest master of haiku. He was also known for his travel essays and his poetry is renowned internationally. While famous for his hokku, he considered his best work to be in leading and participating in renku.

Mir Taqi Mir: Mir Taqi Mir, a renowned Urdu poet in 18th century Mughal India, played a vital role in developing the Urdu language itself. Despite facing familial challenges and experiencing the care of various relatives, his poetry primarily conveyed sorrow, particularly the decline of his beloved city, Delhi. As a prominent figure in the Delhi School of Urdu ghazal, Mir is revered as one of the finest poets in the Urdu language. He adopted the pen name Mir, and the latter part of his life was spent at the court of Asaf-ud-Daulah in Lucknow.

Mirabai: Mirabai, also known as Meera, was a 16th-century Hindu mystic poet and devout follower of Krishna. She is widely revered as a Bhakti saint, especially in North Indian Hindu practice.

Tukaram: Tukaram, also known as Tuka or Tukoba, was a 17th-century Hindu saint from Maharashtra. He belonged to the Varkari sampradaya and lived in Dehu village. Tukaram was a devoted bhakt of Lord Pandurang of Pandharpur. He is renowned for his influential and widely popular devotional poetry called Abhanga. Many of his poems tackle social reform along with spiritual themes.

Tulsidas: Tulsidas, also known as Rambola Dubey, was a revered Hindu saint and poet who was devoted to the deity Rama. He composed famous literary works in Sanskrit, Awadhi, and Braj Bhasha. His most notable works include the Hanuman Chalisa and the epic Ramcharitmanas, a retelling of the Ramayana in the vernacular language Awadhi, based on Rama's life.

Robert Burns: Robert Burns, often called Rabbie Burns, was a Scottish poet and lyricist who is known as the national poet of Scotland. He wrote in both the Scots language and standard English, and his works were accessible to a global audience. Burns is renowned for his political and civil commentary, which he expressed in a blunt manner.

Luís de Camões: Luís de Camões, often referred to as Camoens, is Portugal's greatest poet and is known for his exceptional mastery of verse. He is considered to be on par with renowned poets such as Shakespeare, Milton, and Dante. Camões wrote a substantial amount of lyrical poetry and drama, but he is most remembered for his epic work Os Lusíadas. Unfortunately, his collection of poetry, The Parnasum of Luís de Camões, was lost during his lifetime. Camões' influence is so profound that Portuguese is sometimes referred to as the "language of Camões."

John Donne: John Donne was an English poet, scholar, soldier, and secretary, known for his metaphysical style. He was born into a recusant family and later became a clergyman in the Church of England. As Dean of St. Paul's Cathedral in London, he enjoyed royal patronage. Donne's diverse works include sonnets, love poems, religious poems, Latin translations, epigrams, elegies, songs, satires, and sermons.

John Dryden: John Dryden, an English poet and playwright, became England's inaugural Poet Laureate in 1668.

Johann Wolfgang von Goethe: Johann Wolfgang von Goethe, a German writer, is considered the greatest and most influential writer in the German language. His works have had a profound impact on Western literary, political, and philosophical thought from the late 18th century to today. Goethe was a polymath, excelling in poetry, plays, novels, science, politics, theater, and criticism. His diverse works span literature, aesthetics, botany, anatomy, and color.

John Milton: John Milton was an influential English poet during a time of religious and political change. His epic poem Paradise Lost, written in blank verse, explores the fall of man and the temptation of Adam and Eve by Satan. This work established Milton as one of the greatest poets in history. He also worked as a civil servant for the Commonwealth of England and served under both the Council of State and Oliver Cromwell.

Alexander Pope: Alexander Pope, a notable poet of the Enlightenment era, was recognized as one of the leading English poets of the early 18th century. He excelled in satire and discursive poetry, particularly renowned for works like The Rape of the Lock, The Dunciad, and An Essay on Criticism. Pope's translations of Homer also contributed to his literary acclaim.

Edmund Spenser: Edmund Spenser, an English poet, is famous for The Faerie Queene, an epic poem that celebrates the Tudor dynasty and Elizabeth I. He is considered a premier craftsman of nascent Modern English verse and is recognized as one of the great poets in the English language.

Maya Angelou: Maya Angelou was an influential American writer and activist known for her memoirs, poetry, and work in the civil rights movement. She published several autobiographies and books of essays, along with poetry and works in various media over 50 years. Angelou received numerous awards and honorary degrees for her contributions. Her highly acclaimed autobiography, I Know Why the Caged Bird Sings, explored her childhood and early adulthood, gaining international recognition.

Emily Dickinson: Emily Dickinson was a little-known American poet who is now considered one of the most important figures in American poetry. Born in Amherst, Massachusetts, into a prominent family, she lived in isolation and had a penchant for white clothing. She rarely greeted guests and never married, and most of her friendships were maintained through correspondence.

T. S. Eliot: T. S. Eliot: influential 20th-century poet, essayist, playwright, and literary critic. Pioneer of Modernist poetry, he revitalized English verse and challenged conventional cultural ideas through his language, style, and critical essays.

Robert Frost: Robert Frost, an American poet, is known for his realistic portrayals of rural life in New England. His work was first published in England before gaining recognition in the United States. Frost often utilized American colloquial speech to explore deep social and philosophical themes.

Allen Ginsberg: Allen Ginsberg was an influential American poet and writer, known for his association with the Beat Generation. He formed close friendships with fellow writers including Lucien Carr, William S. Burroughs, and Jack Kerouac during his time at Columbia University. Ginsberg was a vocal critic of militarism, materialism, and sexual repression, and his countercultural beliefs encompassed views on drugs, multiculturalism, Eastern religions, and opposition to bureaucracy.

Langston Hughes: Langston Hughes was an influential American poet, novelist, playwright, and social activist. Known as a pioneer of jazz poetry, he played a key role in the Harlem Renaissance. Hughes described this vibrant era as a time when the African American experience was at its peak popularity, often expressed as "when Harlem was in vogue."

Sylvia Plath: Sylvia Plath, an American poet and novelist, pioneered confessional poetry. Her notable works include The Colossus and Other Poems, Ariel, and The Bell Jar. Plath's posthumously published collection, The Collected Poems, earned her a Pulitzer Prize in Poetry in 1982.

Ezra Pound: Ezra Pound was an American poet and critic associated with modernist poetry. He collaborated with the Fascist Italy and Salò Republic during World War II. Pound's notable works include Ripostes, Hugh Selwyn Mauberley, and The Cantos, his epic poem spanning 800 pages.

Dr. Seuss: Dr. Seuss, the pen name of Theodor Seuss Geisel, was a renowned American children's author and cartoonist. His impressive body of work included over 60 books, widely cherished for their imaginative writing and whimsical illustrations. With a legacy that spans decades, Dr. Seuss's books remain among the most popular in history, captivating young readers worldwide. By the time of his passing, his books had sold over 600 million copies and had been translated into over 20 languages.

Walt Whitman: Walt Whitman, an influential American poet, essayist, and journalist, is known as the father of free verse. He blended transcendentalism and realism in his writings and his 1855 poetry collection Leaves of Grass sparked controversy due to its explicit sensuality.

José Martí: José Martí was a Cuban nationalist, poet, philosopher, educator, and publisher. He played a crucial role in liberating Cuba from Spanish rule and is hailed as a national hero. Martí was an influential figure in Latin American literature and a significant political theorist. Through his writings, activism, and political involvement, he became a symbol of Cuba's struggle for independence. Martí's dedication to liberty and independence for Cuba and Spanish Americans made him the "Apostle of Cuban Independence". His death served as a rallying cry for Cuban revolutionaries and inspired reluctant Cubans to join the fight for independence.

Pablo Neruda: Pablo Neruda, a Chilean poet-diplomat, won the 1971 Nobel Prize in Literature. He wrote in diverse styles, including surrealism, historical epics, and passionate love poems. Notably, his collection "Twenty Love Poems and a Song of Despair" showcased his renowned works.

Ghalib: Mirza Ghalib, also known as Mirza Beg Asadullah Khan, was a renowned Mughal poet in Urdu and Persian. He used the pen names Ghalib and Asad and was honored with the titles Dabir-ul-Mulk and Najm-ud-Daula. Ghalib's work reflects the decline of the Mughal Empire and the rise of British East India Company rule, including the events of the Indian Rebellion of 1857.

Kahlil Gibran: Kahlil Gibran, a Lebanese-American writer, poet and visual artist, is renowned for his internationally acclaimed book, The Prophet. Despite his rejection of the philosopher title, he is considered a philosophical figure. Published in 1923, The Prophet has become a global bestseller, translated into over 100 languages.

Muhammad Iqbal: Muhammad Iqbal, known as Allama, was an Indian Muslim philosopher, author, and politician. His exceptional poetry in the 20th century inspired the Pakistan Movement. He envisioned a cultural and political ideal for British-ruled India's Muslims, which influenced the creation of Pakistan.

Rabindranath Tagore: Rabindranath Tagore, a Bengali polymath, was a renowned poet, writer, playwright, composer, philosopher, social reformer, educationist, and painter during the Bengal Renaissance. He revolutionized Bengali literature, music, and Indian art with Contextual Modernism in the late 19th and early 20th centuries. Tagore's poetic songs were spiritually captivating, while his prose and magical poetry gained immense popularity in the Indian subcontinent. In 1913, he became the first non-European and lyricist to win the Nobel Prize in Literature for his profoundly sensitive and beautiful poetry in Gitanjali. Often referred to as "the Bard of Bengal," Tagore was revered with titles like Gurudeb, Kobiguru, and Biswokobi. He also held membership in the Royal Asiatic Society.

Constantine P. Cavafy: Constantine P. Cavafy, also known as C. P. Cavafy, was a renowned Greek poet, journalist, and civil servant from Alexandria. He is considered a leading figure in Modern Greek literature and one of the most distinguished Greek poets of the 20th century. His works, known for their unique style, have made significant contributions to both Greek and Western poetry.

Adam Mickiewicz: Adam Mickiewicz was a highly influential Polish poet, political activist, and translator, known as a national poet in Poland, Lithuania, and Belarus. He is regarded as one of Poland's greatest poets and a leading figure in Polish Romanticism. Mickiewicz's works have earned him comparisons to renowned European poets Byron and Goethe, and he is widely recognized as a significant Slavic bard.

Sándor Petőfi: Sándor Petőfi: Hungarian poet, liberal revolutionary, and Hungary's national poet. Key figure in the Hungarian Revolution of 1848. Author of the Nemzeti dal, inspiring Hungary's fight for independence from the Austrian Empire. Most likely died in the Battle of Segesvár, one of the final battles of the war.

Taras Shevchenko: Taras Shevchenko, also known as Kobzar Taras, was a multifaceted Ukrainian poet, writer, artist, and political figure. He was recognized as a member of the esteemed Imperial Academy of Arts and the Brotherhood of Saints Cyril and Methodius.

Tristan Tzara: Tristan Tzara was a Romanian avant-garde artist who co-founded the Dada movement. He was a poet, essayist, journalist, playwright, critic, composer, and film director. With Adrian Maniu's influence, he explored Symbolism and established the magazine Simbolul with Ion Vinea and Marcel Janco.

Anna Akhmatova: Anna Akhmatova, pen name of Anna Andreyevna Gorenko, was a highly influential Russian poet in the 20th century. She was a finalist for the Nobel Prize in 1965 and was nominated for it three times in the following year.

Joseph Brodsky: Joseph Brodsky was a Russian and American poet and essayist who was born in Leningrad in 1940. He was expelled from the Soviet Union in 1972 and settled in the United States with the help of W. H. Auden. He taught at various prestigious universities and received the Nobel Prize in Literature in 1987. Brodsky was also appointed as the United States Poet Laureate in 1991.

Vladimir Mayakovsky: Vladimir Mayakovsky was a versatile Russian and Soviet artist, known mainly as a poet, playwright, and actor.

Boris Pasternak: Boris Pasternak: Russian poet, novelist, composer, and literary translator.

Alexander Pushkin: Alexander Pushkin was a highly influential Russian poet and writer, known as the founder of modern Russian literature. His works, which include poetry, plays, and novels, epitomized the Romantic era and earned him the title of the greatest Russian poet by many.

Charles Baudelaire: Charles Baudelaire was a multi-talented French poet known for his mastery of rhyme and rhythm. He also excelled as an essayist, art critic, and translator. His poems, influenced by the Romantics, combine exoticism and a keen observation of real life.

Heinrich Heine: Heinrich Heine was a German poet, writer, and literary critic known for his early lyric poetry. His later works were known for their satirical wit and irony. Heine was a member of the Young Germany movement and his radical views led to his works being banned in Germany. He spent the last 25 years of his life in Paris as an expatriate.

Hermann Hesse: Hermann Hesse was a renowned German-Swiss artist and writer famous for his exploration of self-discovery and spirituality. His notable works, including Demian, Steppenwolf, Siddhartha, and The Glass Bead Game, delve into the search for authenticity and self-knowledge. Hesse received the esteemed Nobel Prize in Literature in 1946.

Federico García Lorca: Federico García Lorca, a Spanish poet, playwright, and theatre director, was a prominent member of the Generation of '27. He introduced European influences into Spanish literature and gained international recognition.

Stéphane Mallarmé: Stéphane Mallarmé, a French poet and critic also known as Étienne Mallarmé, was a prominent symbolist poet. His innovative work influenced revolutionary artistic movements like Cubism, Futurism, Dadaism, and Surrealism in the early 20th century.

Fernando Pessoa: Fernando Pessoa: Portuguese poet, writer, critic, translator, publisher, and philosopher. Prominent literary figure of the 20th century. A renowned Portuguese poet, he also wrote and translated in English and French.

Rainer Maria Rilke: Rainer Maria Rilke was an influential Austrian poet and novelist known for his unique style and exploration of mysticism. His works, which include poetry, a novel, and correspondence, are highly regarded for their subjective themes and expressive nature.

Arthur Rimbaud: Arthur Rimbaud, a French poet, was known for his transgressive and surreal themes. He greatly influenced modern literature and arts, particularly surrealism. Starting as a talented student in Charleville, Rimbaud abandoned his education during the Franco-Prussian War and fled to Paris. During his late teens and early twenties, he created most of his literary works. However, he abruptly stopped writing at age 20 after completing his final major work, Illuminations.

William Blake: William Blake was an influential English poet, painter, and printmaker of the Romantic Age. Although not appreciated in his time, he is now recognized as a significant figure in poetry and visual art. His visionary pieces are considered underappreciated but remarkable, as described by critic Northrop Frye. Blake is regarded as the greatest British artist ever by modern critic Jonathan Jones. His works were varied and symbolically profound, emphasizing the imagination as divine or the essence of humanity. Despite living in London for most of his life, he created a diverse collection of meaningful artwork. In 2002, he was ranked 38th in the BBC's list of the 100 Greatest Britons.

Lord Byron: Lord Byron, a prominent Romantic poet and peer, is considered one of the greatest English poets. Notable for his works "Don Juan" and "Childe Harold's Pilgrimage," as well as popular Hebrew Melodies.

Samuel Taylor Coleridge: Samuel Taylor Coleridge, an English poet and literary critic, co-founded the Romantic Movement with William Wordsworth. He was a member of the Lake Poets, collaborated with notable writers like Charles Lamb, Robert Southey, and Charles Lloyd, and contributed to philosophy and theology.

John Keats: John Keats was an influential English Romantic poet who, alongside Lord Byron and Percy Bysshe Shelley, formed the second generation of Romantic poets. Despite dying at the age of 25 from tuberculosis, his poems gained fame posthumously. His sensual, emotionally-charged style greatly influenced writers of the Pre-Raphaelite Brotherhood. Keats' works, including notable odes like "Ode to a Nightingale" and "Ode on a Grecian Urn," are celebrated for their natural imagery and exploration of extreme emotions. Even today, his poems and letters are widely popular and studied in English literature.

Percy Bysshe Shelley: Percy Bysshe Shelley, a British writer, was a prominent English Romantic poet known for his radical poetry, political & social views. Although he wasn't initially famous, his poetic achievements gained recognition posthumously and influenced future renowned poets like Browning, Swinburne, Hardy, and Yeats. Critics hail him as a stellar craftsman, an unrivaled lyric poet, and possessing an exceptionally skeptical intellect.

Alfred, Lord Tennyson: Alfred, Lord Tennyson, was a renowned English poet and the Poet Laureate during Queen Victoria's reign. He gained recognition with his award-winning poem "Timbuktu" and his influential collection of poems, "Poems, Chiefly Lyrical". Tennyson's celebrated works included "Claribel" and "Mariana" which displayed his powerful visual imagery. His early poetry influenced the Pre-Raphaelite Brotherhood and caught the attention of prominent writers like Samuel Taylor Coleridge.

Dylan Thomas: Dylan Thomas was a Welsh poet and writer known for powerful works like "Do not go gentle into that good night" and "And death shall have no dominion." He also wrote the renowned play "Under Milk Wood" and captivating stories like "A Child's Christmas in Wales." Thomas gained popularity during his lifetime for his unique and expressive style. Even after his death at 39 in New York City, he remained celebrated, with a reputation as a vibrant and doomed poet.

William Wordsworth: William Wordsworth, an English Romantic poet, played a pivotal role in initiating the Romantic Age in English literature through his collaborative work with Samuel Taylor Coleridge on Lyrical Ballads in 1798.

W. B. Yeats: W.B. Yeats was an influential Irish poet and writer in the early 20th century. He played a key role in the Irish Literary Revival and co-founded the Abbey Theatre. Yeats won the Nobel Prize in Literature in 1923 and also served as a Senator in the Irish Free State.

Banjo Paterson: Banjo Paterson was an Australian poet, journalist, and author known for his ballads and poems about Australian rural and outback life. He spent his childhood in Binalong, New South Wales, and wrote notable works such as "Clancy of the Overflow," "The Man from Snowy River," and "Waltzing Matilda," which is often considered Australia's unofficial national anthem.

Aeschylus: Aeschylus was an influential ancient Greek tragedian, known as the father of tragedy. His work marks the beginning of academic knowledge of the genre, and his surviving plays inform our understanding of earlier Greek tragedy. Aeschylus introduced more characters to the theatre and permitted conflict among them, challenging the previous format where characters only interacted with the chorus.

Aristophanes: Aristophanes was an ancient Athenian comic playwright and poet of Old Attic Comedy. He is known for writing 40 plays, 11 of which survive almost completely intact. These plays are valuable examples of Old Comedy and help define the genre. Additionally, fragments from Aristophanes and his contemporaries' lost plays contribute to our understanding of ancient comedic drama.

Bhavabhuti: Bhavabhūti was an influential 8th-century Indian scholar known for his Sanskrit plays and poetry. He is revered for his work, which is considered on par with that of Kalidasa. His significant contribution includes the composition of the Uttararamacarita, earning him the title "Poet of Karun Rasa."

Euripides: Euripides, a tragedian of classical Athens, is one of the three ancient Greek playwrights who have survived in a significant number. While scholars attributed around 95 plays to him, only 18 or 19 are fully preserved. Fragments of his other works exist. Euripides' popularity increased during the Hellenistic Age, making him a vital figure in ancient literary education alongside Homer, Demosthenes, and Menander.

Menander: Menander, a Greek playwright, was a prominent figure in Athenian New Comedy. He authored 108 comedies and achieved success at the Lenaia festival on eight occasions. However, his accomplishments at the City Dionysia are undisclosed.

Plautus: Plautus was an influential Roman playwright known for his comedies, which are the oldest surviving complete works in Latin literature. He wrote in the genre of Palliata comoedia, which was pioneered by Livius Andronicus. The term "Plautine" refers to both his works and those influenced by him.

Sophocles: Sophocles was an ancient Greek tragedian and one of three playwrights whose works have survived in full. He wrote over 120 plays, with seven of them remaining complete. His most famous works include Antigone, Oedipus Rex, and Electra. Sophocles was highly successful in the dramatic competitions of Athens, winning 24 out of 30 competitions and never placing lower than second. He lived during a time when Aeschylus and Euripides were also prominent playwrights.

Terence: Terence, a Roman playwright during the Republic, gained freedom after being educated by a Roman senator. He died young, possibly in a shipwreck, while seeking inspiration for his comedies. His works were widely used for Latin language learning in the Middle Ages and Renaissance, and even influenced Shakespeare.

Pedro Calderón de la Barca: Pedro Calderón de la Barca was a renowned Spanish dramatist and poet during the Baroque period. He earned recognition as one of the top writers of the Spanish Golden Age, primarily for his exceptional plays. Additionally, Calderón de la Barca held the title of knight of the Order of Santiago.

Pierre Corneille: Pierre Corneille was a prominent French tragedian, known as one of the three notable seventeenth-century French dramatists, alongside Molière and Racine.

Ben Jonson: Ben Jonson, an influential English playwright and poet, is known for his satirical plays and witty poetry. He popularized the comedy of humours and is regarded as the second most important English dramatist after Shakespeare. Some of his notable works include Every Man in His Humour, Volpone, The Alchemist, and Bartholomew Fair. Jonson's artistry had a lasting impact on English poetry and stage comedy during the reign of James I.

Christopher Marlowe: Christopher Marlowe, also known as Kit Marlowe, was an influential English playwright and poet during the Elizabethan era. He is considered one of the most famous playwrights of his time, and his play Tamburlaine was highly imitated. Marlowe was a pioneer in the use of blank verse and his plays often featured ambitious protagonists. Despite being known for his realistic humanistic themes, his works also catered to the violent and bloodthirsty tastes of his Elizabethan audience. He is believed to have greatly influenced William Shakespeare, who succeeded him as the leading playwright of the era.

Molière: Molière, or Jean-Baptiste Poquelin, was a prominent French playwright, actor, and poet. His significant contributions to French and world literature include various comedic, farcical, and tragicomic works. Molière's plays are translated and performed worldwide, with the Comédie-Française regularly featuring his plays more than any other playwright. He is revered for his profound influence on the French language, hence often referred to as the "language of Molière."

Jean Racine: Jean Racine was a renowned French dramatist of the 17th century, considered a significant figure in world literature. Alongside Molière and Corneille, he is one of the most influential playwrights of his time. Racine specialized in tragic plays, notably crafting masterpieces like Phèdre, Andromaque, and Athalie. Despite his preference for tragedies, he also created a comedy called Les Plaideurs and a restrained tragedy called Esther, aimed at a younger audience.

Friedrich Schiller: Friedrich Schiller: German poet, playwright, historian, philosopher, and physician. Considered Germany's foremost classical playwright.

William Shakespeare: William Shakespeare, an English playwright, poet, and actor, is widely considered the greatest writer in the English language. He is known as England's national poet and the "Bard of Avon." Shakespeare wrote 39 plays, including collaborations, as well as 154 sonnets, three long narrative poems, and other verses. His works have been translated into numerous languages and are performed more frequently than any other playwright's. Shakespeare remains highly influential, and his works are still studied and reinterpreted today.

Lope de Vega: Lope de Vega was a prominent Spanish writer during the Golden Age of Baroque literature. He was known for his plays, poems, and novels, and is considered second only to Miguel de Cervantes in Spanish literature. Cervantes himself praised Lope de Vega as an exceptional genius.

Wole Soyinka: Wole Soyinka is a Nigerian playwright, novelist, poet, and essayist who was awarded the 1986 Nobel Prize in Literature. He is known for his work in the English language and is the first sub-Saharan African to receive this prestigious honor. His writing explores various aspects of existence through a wide cultural perspective and poetic expressions.

Arthur Miller: Arthur Miller was a renowned American playwright, essayist, and screenwriter of the 20th century. He is well-known for his plays such as All My Sons, Death of a Salesman, The Crucible, and A View from the Bridge. Miller also wrote screenplays, including The Misfits. His play Death of a Salesman is considered a masterpiece of American theater in the 20th century.

Tennessee Williams: Tennessee Williams, the pen name of Thomas Lanier Williams III, was a renowned American playwright and screenwriter. He is widely recognized as one of the most important playwrights in 20th-century American drama, standing with Eugene O'Neill and Arthur Miller.

Antonin Artaud: Antonin Artaud, a French artist, is a prominent figure in the European avant-garde. His diverse work spans various mediums, with his writings, theatre, and cinema contributions being particularly notable. He revolutionized twentieth-century theatre with his Theatre of Cruelty concept. Artaud's raw and transgressive style delved into themes encompassing ancient cosmologies, philosophy, the occult, mysticism, and indigenous practices of Mexico and Bali.

Samuel Beckett: Samuel Beckett, an Irish writer, was known for his bleak and tragicomic works that incorporated black comedy and nonsense. As a novelist, dramatist, and poet, he explored minimalism, linguistic experimentation, and stream of consciousness techniques. Beckett is recognized as a key figure in the Theatre of the Absurd, alongside being one of the last modernist writers.

Bertolt Brecht: Bertolt Brecht, born Eugen Berthold Friedrich Brecht in Germany, was a renowned theatre practitioner, poet, and playwright. He rose to fame during the Weimar Republic and achieved early success in Munich before settling in Berlin in 1924. In collaboration with Kurt Weill, he wrote The Threepenny Opera and established a lifelong partnership with composer Hanns Eisler. Immersed in Marxist ideology, Brecht became a leading figure in epic theatre and developed the concept of Verfremdungseffekt (alienation effect), while also writing didactic Lehrstücke.

Anton Chekhov: Anton Chekhov, a Russian playwright and short-story writer, is regarded as one of the greatest writers of all time. His career produced four influential plays and his best short stories are highly regarded. He, alongside Ibsen and Strindberg, is considered one of the pioneers of early modernism in theatre. Chekhov, also a physician, famously said, "Medicine is my lawful wife, and literature is my mistress."

Nikolai Gogol: Nikolai Gogol was a renowned Russian writer of Ukrainian descent. He is celebrated for his notable works as a novelist, playwright, and short story writer.

Henrik Ibsen: Henrik Ibsen was a Norwegian playwright known as "the father of realism" and a key figure in modernism in theatre. His influential works include A Doll's House, Hedda Gabler, and Peer Gynt. Ibsen is the most frequently performed dramatist after Shakespeare, and his play A Doll's House was the most performed worldwide in 2006.

Eugène Ionesco: Eugène Ionesco, a Romanian-French playwright, was a leading figure in the French avant-garde theatre of the 20th century. His groundbreaking "anti play", The Bald Soprano, sparked the Theatre of the Absurd movement, exploring concepts of absurdism and surrealism. In recognition of his contributions, he became a member of the Académie française in 1970 and received prestigious literary prizes in 1970 and 1973.

Luigi Pirandello: Luigi Pirandello, an Italian writer, is known for his plays and was awarded the Nobel Prize in Literature in 1934. He wrote numerous novels, hundreds of short stories, and about 40 plays, some in Sicilian. His tragic farces are considered precursors to the Theatre of the Absurd.

George Bernard Shaw: George Bernard Shaw was an Irish playwright, critic, and political activist. He wrote over 60 plays, including influential works like Man and Superman, Pygmalion, and Saint Joan. Shaw's writings covered contemporary satire and historical allegory, making him a leading dramatist of his time. In 1925, he was honored with the Nobel Prize in Literature for his contributions to Western theatre, culture, and politics.

August Strindberg: August Strindberg was a prolific Swedish writer and painter, known for his innovative and experimental work. He wrote over sixty plays and thirty works of fiction, autobiography, and politics. Strindberg is considered the "father" of modern Swedish literature and his novel The Red Room is seen as the first modern Swedish novel. While known as a novelist and playwright in Sweden, he is mostly recognized as a playwright in other countries.

Oscar Wilde: Oscar Wilde was an Irish poet and playwright, known for his wit and plays. He gained popularity in London during the 1890s. He is remembered for his epigrams, plays like The Picture of Dorian Gray, and his conviction for homosexual acts.

Stan Lee: Stan Lee, the iconic American comic book writer, editor, publisher, and producer, played a pivotal role in the growth and success of Marvel Comics. He led the company's transformation from a small division of a publishing house to a powerful multimedia corporation that dominated both the comics and film industries for over twenty years.

Svetlana Alexievich: Svetlana Alexievich is a Belarusian investigative journalist, essayist, and oral historian who writes in Russian. She received the 2015 Nobel Prize in Literature for her polyphonic writings that reflect the suffering and courage of our time. Alexievich is the first writer from Belarus to be honored with this award.

Nellie Bly: Nellie Bly, whose real name was Elizabeth Cochran Seaman, was an American journalist known for her groundbreaking achievements. She gained fame by circumnavigating the globe in just 72 days, inspired by Jules Verne's Phileas Fogg. Additionally, she conducted undercover reporting inside a mental institution, revealing its mistreatment. Considered a pioneer, Bly revolutionized investigative journalism.

Walter Lippmann: Walter Lippmann, an influential American writer and political commentator, introduced the concept of the Cold War and coined the term "stereotype" in its modern psychological sense. He extensively critiqued media and democracy through his newspaper column and notable book, Public Opinion, published in 1922.

Ida Tarbell: Ida Tarbell was an influential American writer, journalist, and lecturer during the late 19th and early 20th centuries. Known as one of the leading muckrakers and reformers of the Progressive Era, she played a pivotal role in the development of investigative journalism.

Hunter S. Thompson: Hunter S. Thompson, an American journalist and author, gained recognition for his book "Hell's Angels" (1967) after immersing himself in the Hells Angels motorcycle club. His article, "The Kentucky Derby Is Decadent and Depraved" (1970), established him as a countercultural icon. Thompson developed his unique style of New Journalism called "Gonzo," in which he inserted himself as a central figure in his stories.

Bob Woodward: Bob Woodward is an American investigative journalist who joined The Washington Post in 1971 and currently serves as an associate editor.

Walter Cronkite: Walter Cronkite was a highly respected American broadcast journalist who served as anchorman for CBS Evening News for 19 years. He earned the title "the most trusted man in America" during the 1960s and 1970s. Cronkite was honored with multiple awards, including two Peabody Awards and a Presidential Medal of Freedom.

Edward R. Murrow: Edward R. Murrow, an American broadcaster and journalist, achieved fame during World War II with live radio reports from Europe for CBS. He formed a group of correspondents, called the Murrow Boys, who collaborated closely with him.

Horace Greeley: Horace Greeley was an influential American newspaper editor, founder of the New-York Tribune, and active politician. Although his presidential campaign in 1872 as the candidate of the new Liberal Republican Party was unsuccessful, Greeley played a significant role in shaping the political landscape during his time.

William Randolph Hearst: William Randolph Hearst was an American businessman, newspaper publisher, and politician. He developed the country's largest newspaper chain and media company, Hearst Communications. With his flamboyant and sensationalist approach called yellow journalism, he greatly influenced the popular media. He started his publishing career in 1887 when he gained control of The San Francisco Examiner.

Joseph Pulitzer: Joseph Pulitzer was a Hungarian-American politician and influential newspaper publisher. He notably led the St. Louis Post-Dispatch and the New York World. Pulitzer gained prominence within the Democratic Party and served as a congressman from New York.

Anna Wintour: Anna Wintour is a highly influential British and American media executive based in New York City. As the editor-in-chief of Vogue since 1988, she has been instrumental in shaping the fashion industry. Wintour is known for her distinctive style, including her iconic bob haircut and dark sunglasses. She holds prominent positions within Condé Nast, overseeing its global magazines as the global chief content officer and serving as the artistic director of Condé Nast and global editorial director of Vogue. Although praised for her trend-spotting abilities, Wintour's reputation also includes being labeled "Nuclear Wintour" due to her reputedly aloof and demanding personality.

Giotto: Giotto di Bondone, an Italian painter and architect from Florence, was a prominent figure during the Late Middle Ages. He worked in the Gothic and Proto-Renaissance period, making a significant impact on the art world. Giotto was renowned for his ability to depict figures and postures realistically, drawing inspiration from nature. He is credited with breaking away from the prevalent Byzantine style, introducing a more lifelike technique in painting. His work marked a crucial shift in the history of art, reviving the practice of drawing accurately from life after its neglect for over two centuries.

Hieronymus Bosch: Hieronymus Bosch, a Dutch painter from Brabant, was a prominent figure in Early Netherlandish painting. His artwork, primarily oil on oak wood, is famous for its remarkable depictions of religious themes and stories. His imaginative and often eerie images, particularly of hell, were widely copied during his time and are sought after in collections across the Netherlands, Austria, and Spain.

Sandro Botticelli: Sandro Botticelli, also known as Alessandro di Mariano di Vanni Filipepi, was an Italian painter of the Early Renaissance. He was rediscovered by the Pre-Raphaelites in the late 19th century, leading to a reevaluation of his work. Botticelli's paintings represent the graceful style of late Italian Gothic and Early Renaissance, even though they were created during the latter half of the Italian Renaissance.

Pieter Bruegel the Elder: Pieter Bruegel the Elder, a renowned artist of Dutch and Flemish Renaissance painting, was a pioneer in creating large paintings of landscapes and peasant scenes. His works are highly regarded for their depiction of both subjects, and he is recognized as a significant figure in the art world.

Caravaggio: Caravaggio, also known as Michelangelo Merisi, was an influential Italian painter who spent most of his career in Rome. In his final years, he traveled between Naples, Malta, and Sicily. His distinct style combined realistic depictions of the human condition with dramatic lighting, shaping the development of Baroque painting.

Jacques-Louis David: Jacques-Louis David, a prominent French painter, played a significant role in shifting artistic tastes from Rococo to Neoclassical style. He specialized in history painting, characterized by intellectual content, classical elements, and emotional intensity. His work reflected the moral climate of the final years of the Ancien Régime, favoring austerity and severity over frivolity.

Albrecht Dürer: Albrecht Dürer, a renowned German artist and theorist of the Renaissance, gained fame in his twenties for his exceptional woodcut prints. His influence spread across Europe, and he had connections with important Italian artists such as Raphael, Giovanni Bellini, and Leonardo da Vinci. Emperor Maximilian I became his patron from 1512 onwards.

Jan van Eyck: Jan van Eyck was a pioneering Flemish painter in Bruges, known for his contributions to Early Netherlandish and Northern Renaissance art. While he is credited with inventing oil painting, this claim is now considered oversimplified by most art historians.

Artemisia Gentileschi: Artemisia Gentileschi was an Italian Baroque painter, known for her stunning artwork and being one of the most accomplished artists of the seventeenth century. She began her career at a young age and was the first woman to become a member of the Accademia di Arte del Disegno in Florence. Despite living in an era with limited opportunities for women in the arts, Gentileschi had an international clientele, showcasing her talent and breaking barriers.

El Greco: El Greco, born Domḗnikos Theotokópoulos, was a Greek painter, sculptor, and architect of the Spanish Renaissance. He is known for his distinctive style and use of elongated figures. Although he signed his paintings with his full birth name, he was commonly referred to as El Greco.

Francisco Goya: Francisco Goya, a prominent Spanish painter and printmaker, was a key figure in the late 18th and early 19th centuries. His art captured the turmoil of his time and greatly influenced later painters. Goya is recognized as both an Old Master and a precursor to modern art.

William Hogarth: William Hogarth was an influential English artist known for his realistic portraits, satirical illustrations, and comic strip-like series called "modern moral subjects". His iconic works like A Harlot's Progress, A Rake's Progress, and Marriage A-la-Mode are widely recognized. The term "Hogarthian" is used to describe satirical political illustrations in his distinct style.

Hans Holbein the Younger: "Hans Holbein the Younger was a renowned 16th-century German-Swiss painter and printmaker, known for his exceptional portrait work. His artistic repertoire also included religious art, satire, and Reformation propaganda, and he played a crucial role in the development of book design. To differentiate him from his father, Hans Holbein the Elder, a skilled Late Gothic painter, he is referred to as 'the Younger'."

Leonardo da Vinci: Leonardo da Vinci, the Italian polymath of the High Renaissance, was a painter, engineer, scientist, sculptor, and architect. His famous notebooks contain drawings and notes on anatomy, astronomy, botany, cartography, painting, and paleontology. Leonardo is considered a genius who embodied the Renaissance humanist ideal. His extensive works rival those of Michelangelo and continue to inspire future generations of artists.

Masaccio: Masaccio, a prominent Italian artist of the Quattrocento period, is often considered the first great painter of the Italian Renaissance. Renowned for his ability to realistically portray nature, he skillfully depicted lifelike figures and movements with a remarkable sense of depth. Masaccio's innovative use of nudes and foreshortening in his artwork was groundbreaking for his time.

Nicolas Poussin: Nicolas Poussin was a French painter known for his classical French Baroque style. He spent most of his career in Rome, painting religious and mythological subjects for a select group of Italian and French collectors. He briefly served as First Painter to the King in Paris but returned to Rome and continued with his traditional themes. In his later years, he emphasized landscapes in his work. Poussin's paintings are characterized by clarity, logic, and order, with an emphasis on line rather than color. He greatly influenced classical artists like Jacques-Louis David, Jean-Auguste-Dominique Ingres, and Paul Cézanne until the 20th century.

Raphael: Raphael, also known as Raffaello Sanzio da Urbino, was an esteemed Italian painter and architect of the High Renaissance. His exceptional work is distinguished by its clear form, effortless composition, and embodiment of the Neoplatonic concept of human greatness. Alongside Leonardo da Vinci and Michelangelo, he is considered one of the leading masters of that era.

Rembrandt: Rembrandt was a renowned Dutch painter, printmaker, and draughtsman during the Dutch Golden Age. He is regarded as one of the greatest visual artists in history. Known for his innovation and prolific output, Rembrandt created around 300 paintings, 300 etchings, and 2,000 drawings.

Peter Paul Rubens: Peter Paul Rubens was a Flemish artist and diplomat known for his influential Baroque style. His highly charged compositions referenced classical and Christian history, emphasizing movement, color, and sensuality. He produced altarpieces, portraits, landscapes, and history paintings of mythological and allegorical subjects. Rubens also designed cartoons for tapestry workshops and frontispieces for publishers in Antwerp.

Titian: Titian, born Tiziano Vecelli or Vecellio, was an Italian Renaissance painter from Lombardy. He is recognized as the leading member of the 16th-century Venetian school. His birthplace was Pieve di Cadore, near Belluno, and he was commonly referred to as "da Cadore" during his lifetime, indicating his connection to the region.

Diego Velázquez: Diego Velázquez was a prominent Spanish painter during the Golden Age. He served as the leading artist in the court of King Philip IV of Spain and Portugal and was a Knight of the Order of Santiago.

Johannes Vermeer: Johannes Vermeer, a Dutch painter in the Baroque Period, is known for his exceptional depictions of middle-class life and domestic interior scenes. He is celebrated as one of the most accomplished artists of the Dutch Golden Age. Although he had a modest career as a provincial genre painter, mainly recognized in Delft and The Hague, Vermeer's output was limited, and he primarily earned his livelihood as an art dealer. He passed away with little wealth, leaving his wife in debt.

Antoine Watteau: Antoine Watteau was a French painter who played a significant role in reviving interest in color and movement. He transformed the fading Baroque style into a more naturalistic Rococo style. Watteau is known for inventing the genre of fêtes galantes, charming scenes with a theatrical atmosphere. His famous subjects often came from the world of Italian comedy and ballet.

Paul Cézanne: Paul Cézanne, a French Post-Impressionist painter, revolutionized art by introducing innovative styles and influenced avant-garde movements of the early 20th century. He bridged the gap between Impressionism and Cubism, leaving a lasting impact on the art world.

Marc Chagall: Marc Chagall, a Belarusian and French artist, was a versatile early modernist known for his diverse artistic styles and mediums. His creations encompassed painting, drawings, book illustrations, stained glass, stage sets, ceramics, tapestries, and fine art prints.

John Constable: John Constable, an English landscape painter, transformed landscape painting by depicting his beloved home, Dedham Vale. His works in the Romantic tradition were filled with intense affection and emotion, as he believed that painting was a way to express one's feelings.

Gustave Courbet: Gustave Courbet was a leading French painter of the 19th-century Realism movement. He challenged academic conventions and rejected the Romantic style of his predecessors. His commitment to painting only what he observed set an influential example for later artists, including the Impressionists and Cubists. Courbet's innovative work and bold social statements have secured his place as a key figure in 19th-century French painting.

Salvador Dalí: Salvador Dalí, born Salvador Domingo Felipe Jacinto Dalí i Domènech, Marquess of Dalí of Púbol, was a Spanish surrealist artist known for his skillful techniques, meticulous drawings, and extraordinary and unconventional imagery.

Edgar Degas: Edgar Degas, a renowned French Impressionist artist, excelled in pastel drawings and oil paintings.

Eugène Delacroix: Eugène Delacroix was a French Romantic artist who was known as the leader of the French Romantic school.

Max Ernst: Max Ernst was a German artist who played a vital role in the Dada movement and Surrealism in Europe. Despite lacking formal training, he pioneered frottage and grattage techniques, using unconventional methods to create art. Ernst also excelled in collages, creating novels and pamphlets. His World War I experience left him critical of the modern world, and during World War II, he was classified as an "undesirable foreigner" while residing in France.

Caspar David Friedrich: Caspar David Friedrich, a prominent German Romantic landscape painter, is renowned for his allegorical landscapes depicting contemplative figures set against night skies, misty mornings, desolate trees, and Gothic ruins. He emphasized the contemplation of nature and conveyed subjective, emotional responses through symbolic and anti-classical works. Friedrich's paintings feature human figures in small proportion to vast landscapes, inviting viewers to explore their metaphysical aspects.

Paul Gauguin: Paul Gauguin was a French Post-Impressionist artist known for his distinct use of color and Synthetist style. Initially unappreciated, his work gained recognition after his death. He spent the last decade of his life in French Polynesia, where he created paintings depicting the people and landscapes of the region.

Vincent van Gogh: Vincent van Gogh, a Dutch Post-Impressionist painter, is a renowned figure in Western art. Known for his expressive brushwork and symbolic colors, he created over 2,100 artworks in just over a decade. These included landscapes, portraits, and still lifes. Van Gogh's fame came after his suicide at the age of 37, following a life of poverty and mental illness. Though only one artwork was sold during his lifetime, his contributions laid the groundwork for modern art.

Edward Hopper: Edward Hopper was a renowned American painter and printmaker known for his realist style. He excelled in oil painting, watercolor, and etching.

Jean-Auguste-Dominique Ingres: Jean-Auguste-Dominique Ingres, a prominent French Neoclassical painter, sought to preserve traditional artistic practices and resisted the growing Romantic style. While he considered himself a history painter, it is his remarkable portraits that endure as his most significant contribution. Ingres' unique manipulation of form and space profoundly influenced modern art, inspiring notable artists such as Picasso and Matisse.

Frida Kahlo: Frida Kahlo, a Mexican painter, is renowned for her portraits, self-portraits, and works influenced by Mexico's culture. Her art explores themes of identity, gender, race, and class using a naïve folk art style. Kahlo's paintings combine realism and fantasy, often with autobiographical elements. She was associated with the post-revolutionary Mexicayotl movement and is recognized as a surrealist or magical realist. Kahlo also depicted her chronic pain through her art.

Wassily Kandinsky: Wassily Kandinsky, a Russian painter and art theorist, is credited as a pioneer of abstraction in western art. He was born in Moscow but spent his childhood in Odessa, where he graduated from Odessa Art School. While successful in law and economics, he began painting at the age of 30 and later became a professor at the University of Dorpat.

Paul Klee: Paul Klee was a Swiss-born German artist known for his highly individual style influenced by expressionism, cubism, and surrealism. He extensively explored color theory, writing about it in his influential lectures called the Paul Klee Notebooks. Klee taught at the Bauhaus school alongside Wassily Kandinsky. His works reflect a dry sense of humor, a childlike perspective, personal moods and beliefs, and a deep musicality.

René Magritte: René Magritte was a Belgian surrealist artist who depicted familiar objects in unusual ways, questioning the nature of reality. His work has influenced pop art, minimalist art, and conceptual art.

Kazimir Malevich: Kazimir Malevich, a Russian artist and art theorist, revolutionized abstract art in the 20th century. He aimed to distance art from natural forms and subject matter by creating the concept of Suprematism. By prioritizing pure feeling and spirituality, Malevich sought to achieve the "supremacy of pure feeling." Additionally, he is recognized as part of the Ukrainian avant-garde, which encompassed artists who influenced art movements across Europe and America.

Édouard Manet: Édouard Manet was a pioneering French painter who helped bridge the gap between Realism and Impressionism. He was among the first to depict modern life in his works, making him a key figure in the 19th-century art movement.

Franz Marc: Franz Marc was a prominent German painter and printmaker known for being a key figure of German Expressionism. He co-founded Der Blaue Reiter, a renowned journal that represented a collective of artists.

Henri Matisse: Henri Matisse was a French visual artist known for his vibrant use of color and original draughtsmanship. He was primarily a painter but also excelled in printmaking and sculpture. Matisse, along with Pablo Picasso, played a crucial role in revolutionizing the visual arts during the early 20th century, making significant contributions to painting and sculpture.

Joan Miró: Joan Miró i Ferrà was a prominent Spanish artist known for his paintings, sculptures, and ceramics. Born in Barcelona, he is widely recognized simply as Joan Miró. The city of Barcelona established the Fundació Joan Miró in 1975, showcasing his extensive body of work. Additionally, the Fundació Pilar i Joan Miró was established in his adoptive city of Palma in 1981.

Piet Mondrian: Piet Mondrian, formerly known as Pieter Cornelis Mondriaan, was a Dutch painter and art theoretician. He is considered one of the greatest artists of the 20th century and a pioneer in abstract art. Mondrian transitioned from figurative painting to a highly simplified style, using basic geometric elements. His work became synonymous with simplicity and the exploration of space and balance.

Claude Monet: Claude Monet, a French painter and founder of impressionist painting, was a key precursor to modernism. He sought to paint nature as he perceived it, primarily focusing on plein air landscape painting. His consistent and prolific career made him the most notable practitioner of impressionism, a philosophy that expressed one's perceptions before nature. The term "Impressionism" was derived from his painting "Impression, soleil levant," which was exhibited in 1874 as an alternative to the Salon.

Edvard Munch: Edvard Munch, a Norwegian painter, is renowned for his iconic painting, The Scream, which is considered one of the most acclaimed images in Western art.

Georgia O'Keeffe: Georgia O'Keeffe, an American modernist painter, was internationally recognized as the "Mother of American modernism". Her career spanned seven decades, during which she created meticulously detailed paintings of natural forms, specifically flowers and desert landscapes. O'Keeffe's work remained independent of major art movements and was inspired by the places and environments in which she lived.

Pablo Picasso: Pablo Picasso was a Spanish artist who lived most of his life in France. He was highly influential in the 20th century and is renowned for co-founding the Cubist movement, innovating constructed sculpture, and co-inventing collage. Picasso also explored a wide range of styles. Notable works include Les Demoiselles d'Avignon, an early Cubist piece, and Guernica, a powerful anti-war painting depicting the bombing of Guernica during the Spanish Civil War.

Camille Pissarro: Camille Pissarro was a Danish-French painter known for his contributions to Impressionism and Post-Impressionism. He studied under influential artists such as Courbet and Corot and later worked with Seurat and Signac in the Neo-Impressionist style.

Jackson Pollock: Jackson Pollock was an influential American painter known for his unique "drip technique" where he poured or splashed paint onto a canvas. This abstract expressionist style allowed him to paint from all angles, using his whole body's force. While some appreciated the immediate creation and dynamic style, others criticized the random effects. In 2016, one of his paintings sold for a staggering $200 million in a private transaction.

Pierre-Auguste Renoir: Pierre-Auguste Renoir was a French Impressionist artist known for his celebration of beauty and feminine sensuality. His work is considered to be the continuation of a tradition that spans from Rubens to Watteau.

Ilya Repin: Ilya Repin was a famous Russian painter in the 19th century, originally from Ukraine. He created notable works such as "Barge Haulers on the Volga," "Religious Procession in Kursk Province," "Ivan the Terrible and His Son Ivan," and "Reply of the Zaporozhian Cossacks." Repin was also known for his revealing portraits of prominent Russian literary and artistic figures, including Leo Tolstoy, Pavel Tretyakov, and Modest Mussorgsky.

Gerhard Richter: Gerhard Richter is a renowned German artist known for his diverse range of artwork, including abstract and photorealistic paintings, photographs, and glass sculptures. He is highly regarded as one of the most significant contemporary German artists and has achieved record-breaking prices for his works at auctions.

Diego Rivera: Diego Rivera, a renowned Mexican painter, is responsible for popularizing the mural movement in art. Known for his large frescoes, he made significant contributions to both Mexican and international art scenes.

Henri Rousseau: Henri Rousseau, also known as Le Douanier, was a French post-impressionist painter who worked in the Naïve or Primitive style. Initially a toll and tax collector, he began painting seriously in his forties and eventually retired at age 49 to dedicate himself fully to his art.

John Singer Sargent: John Singer Sargent, a prominent American expatriate artist, was renowned as the foremost portrait painter of his time, capturing the opulence of the Edwardian era. With a vast collection of over 900 oil paintings, 2,000 watercolors, and numerous sketches and charcoal drawings, his work reveals a documentation of global exploration, ranging from Venice and the Tyrol to Spain, the Middle East, Montana, Maine, and Florida.

Georges Seurat: Georges Seurat, a French post-Impressionist artist, invented chromoluminarism and pointillism painting techniques. He also utilized conté crayon for drawings on rough-surfaced paper.

Henri de Toulouse-Lautrec: Henri de Toulouse-Lautrec, also known as Toulouse-Lautrec, was a renowned French painter, printmaker, illustrator, and caricaturist. Immersed in the vibrant and theatrical atmosphere of late 19th-century Paris, he created a captivating collection of elegant and provocative images that depicted the decadent affairs of the time.

J. M. W. Turner: J.M.W. Turner, also known as William Turner, was an English Romantic painter, printmaker, and watercolourist. He was recognized for his expressive use of color, imaginative landscapes, and tumultuous marine paintings. Turner produced over 550 oil paintings, 2,000 watercolours, and 30,000 works on paper. He gained significant support from influential critic John Ruskin and is celebrated for elevating landscape painting to the level of historical painting.

Andy Warhol: Andy Warhol, an influential American artist in the pop art movement, explored the connection between artistic expression, advertising, and celebrity culture. He created works in various mediums such as painting, silkscreening, photography, film, and sculpture. Notable pieces include Campbell's Soup Cans and Marilyn Diptych. Warhol also directed films like Empire and Chelsea Girls, and organized multimedia events like the Exploding Plastic Inevitable.

James McNeill Whistler: James McNeill Whistler was an American painter known for his oil and watercolor works, as well as printmaking. He was active during the American Gilded Age, but mostly based in the United Kingdom. Whistler rejected sentimentality and moral messages in his art, emphasizing the belief in "art for art's sake."

Aubrey Beardsley: Aubrey Beardsley was an English illustrator and author known for his black ink drawings inspired by Japanese woodcuts. His artworks depicted the grotesque, the decadent, and the erotic. Beardsley was a leading member of the aesthetic movement, alongside Oscar Wilde and James McNeill Whistler. Despite dying young from tuberculosis, his contributions to Art Nouveau and poster styles were significant. Beardsley is considered an important figure in the Modern Style artistic movement.

Will Eisner: Will Eisner was an influential American cartoonist and writer who worked in the comic book industry. He introduced the term "graphic novel" and experimented with content and form in his series The Spirit. He also contributed to the study of comics through his book Comics and Sequential Art. The Eisner Award and Comic Book Hall of Fame were named in his honor.

M. C. Escher: M. C. Escher, a Dutch graphic artist, created artistic works inspired by mathematics, including woodcuts, lithographs, and mezzotints. Despite initial neglect, his work gained popularity in the late twentieth century and has since been celebrated in exhibitions worldwide.

Hergé: Hergé, the pen name of Georges Prosper Remi, was a highly acclaimed Belgian comic strip artist known for his distinctive ligne claire drawing style. He is most famous for creating The Adventures of Tintin, a series of comic albums considered to be one of the most popular European comics of the 20th century. Hergé also created two other notable series: Quick & Flupke and The Adventures of Jo, Zette and Jocko.

Jack Kirby: Jack Kirby, an influential American comic book artist, was a major innovator in the industry. Growing up in New York City, he honed his skills by tracing characters from comic strips. He entered the comics world in the 1930s under various pen names before settling on Jack Kirby. Alongside writer-editor Joe Simon, he co-created the iconic superhero character Captain America in 1940. Throughout the 1940s, Kirby collaborated with Simon, generating numerous characters for both Timely Comics (later Marvel Comics) and National Comics Publications (later DC Comics).

Winsor McCay: Zenas Winsor McCay, an American cartoonist and animator, is renowned for creating Little Nemo, a famous comic strip. He is also celebrated for his groundbreaking animated film, Gertie the Dinosaur, released in 1914. McCay adopted the pen name Silas for his comic strip Dream of the Rarebit Fiend due to contractual obligations.

Norman Rockwell: Norman Rockwell, an American painter and illustrator, is renowned for his art that captures the essence of American culture. He is famous for creating cover illustrations for The Saturday Evening Post magazine, showcasing everyday life in the United States. Some of his most notable works include the Willie Gillis series, Rosie the Riveter, The Problem We All Live With, Saying Grace, and the Four Freedoms series. Rockwell also had a longstanding involvement with the Boy Scouts of America, producing illustrations for Boys' Life and other publications, which exemplify the Scout Oath and Scout Law.

Osamu Tezuka: Osamu Tezuka, a Japanese manga artist, cartoonist, and animator, is known as "the Father of Manga" and "the Godfather of Manga." He had a prolific output and used pioneering techniques, earning him the title "the God of Manga." Considered the Japanese equivalent to Walt Disney, he was inspired by Disney during his formative years. While praised for his early manga works for children, Tezuka also had a significant influence with his later, more literary gekiga works.

Gian Lorenzo Bernini: Gian Lorenzo Bernini, an Italian sculptor and architect, was a leading figure in the Baroque style of sculpture. He is compared to Shakespeare in his influence on his art form. Bernini's talents extended to painting and theater, where he wrote, directed, and acted in plays and also designed stage sets and theatrical machinery. He was also skilled in designing decorative art objects, including lamps, tables, mirrors, and coaches.

Constantin Brâncuși: Constantin Brâncuși, a Romanian sculptor, painter, and photographer, is considered one of the most influential sculptors of the 20th century and a pioneer of modernism. He is known for his emphasis on clean geometrical lines and symbolic allusions, inspired by non-European cultures and Romanian folk art. Brâncuși's career blossomed in France, where he studied at prestigious institutions like the École des Beaux-Arts in Paris. His work is often associated with primitive exoticism and has left a lasting impact on the world of sculpture.

Donatello: Donatello, an Italian sculptor of the Renaissance period, developed an Early Renaissance style of sculpture through his classical training. He worked in various cities, introducing his techniques to different parts of Italy. His notable works include the first freestanding nude male sculpture since antiquity, David, commissioned by the Medici family.

Marcel Duchamp: Marcel Duchamp was a French artist associated with Cubism, Dada, and conceptual art, who had a significant impact on 20th- and 21st-century art. Along with Picasso and Matisse, he helped define revolutionary developments in painting and sculpture. Duchamp rejected art intended to please the eye, instead aiming to use art to serve the mind.

Alberto Giacometti: Alberto Giacometti: Swiss artist known for sculpture, painting, drawing, and printmaking. Lived in Paris, frequently visited hometown Borgonovo, and created notable artworks.

Michelangelo: Michelangelo, a renowned Italian artist of the High Renaissance, was a master in sculpture, painting, architecture, and poetry. Inspired by classical antiquity, his work had a profound impact on Western art. Alongside Leonardo da Vinci, he is considered an archetypal Renaissance man. Michelangelo's extensive surviving correspondence, sketches, and accolades make him one of the best-documented artists of the 16th century. He was highly regarded by contemporary biographers as the most accomplished artist of his time.

Henry Moore: Henry Moore was an English artist famous for his large bronze sculptures that can be found in public spaces worldwide. He also created a series of drawings portraying Londoners seeking shelter during World War II and produced other graphic works on paper.

Phidias: Phidias, an Ancient Greek sculptor, painter, and architect, created the Statue of Zeus at Olympia, one of the Seven Wonders of the Ancient World. He also designed the statues of Athena on the Athenian Acropolis, including the Athena Parthenos inside the Parthenon and the Athena Promachos. Phidias was the son of Charmides of Athens and learned under the guidance of Hegias and Ageladas.

Auguste Rodin: Auguste Rodin, a French sculptor, is hailed as the pioneer of modern sculpture. With a traditional education in sculpting, he adopted a craftsman-like approach to his work. One of his remarkable skills was his ability to sculpt intricate and emotionally charged surfaces in clay. Rodin is renowned for masterpieces like The Thinker, Monument to Balzac, The Kiss, The Burghers of Calais, and The Gates of Hell.

Alvar Aalto: Alvar Aalto was a Finnish architect and designer known for his diverse body of work including architecture, furniture, textiles, and glassware. He considered himself primarily an architect, with painting and sculpture as supplemental forms. Aalto thrived during Finland's rapid economic growth in the early 20th century, attracting industrialist clients such as the Ahlström-Gullichsen family. His career spanned from the 1920s to the 1970s, showcasing styles ranging from Nordic Classicism to a rational International Style Modernism and finally settling into an organic modernist approach in the 1940s.

Leon Battista Alberti: Leon Battista Alberti, an Italian Renaissance polymath, was a humanist author, artist, architect, poet, priest, linguist, philosopher, and cryptographer. Often regarded as the founder of Western cryptography, he shares this distinction with Johannes Trithemius.

Le Corbusier: Le Corbusier, born Charles-Édouard Jeanneret, was a Swiss-French architect, designer, painter, urban planner, and writer. He is considered a pioneer of modern architecture and designed buildings across the globe. He attained French nationality and had a career spanning five decades. He believed that modern architecture's foundation lay in Viollet-le-Duc.

Filippo Brunelleschi: Filippo Brunelleschi, an Italian architect, designer, goldsmith, and sculptor, is considered a founding father of Renaissance architecture and the first modern engineer. He received the first patent in the Western world. Brunelleschi is renowned for designing the dome of Florence Cathedral and introducing the mathematical technique of linear perspective in art. His wide-ranging accomplishments include other architectural works, sculpture, mathematics, engineering, and ship design. Most of his surviving works can be found in Florence.

Buckminster Fuller: Richard Buckminster Fuller, also known as R. Buckminster Fuller, was a multi-talented American architect, designer, inventor, and philosopher. He was renowned for his innovative ideas and concepts, having coined or popularized terms such as "Spaceship Earth", "Dymaxion", "synergetics", and "tensegrity". Fuller published over 30 books, showcasing his prolific writings on various subjects.

Antoni Gaudí: Antoni Gaudí, a renowned Catalan architect and designer, is hailed as the foremost figure of Catalan Modernism. His unique and distinctive style is evident in his works, most notably the Sagrada Família church situated in Barcelona.

Frank Gehry: Frank Gehry is an acclaimed Canadian-born American architect and designer known for creating renowned buildings, such as his iconic home in Santa Monica that have attracted global attention.

Walter Gropius: Walter Gropius was a renowned German-American architect who founded the influential Bauhaus School in 1919. He is considered a pioneering master of modernist architecture and a leading figure in the International Style movement. His notable contemporaries include Alvar Aalto, Ludwig Mies van der Rohe, Le Corbusier, and Frank Lloyd Wright.

Zaha Hadid: Zaha Hadid was an influential Iraqi-British architect, artist, and designer known for her innovative work during the late-20th and early-21st centuries. She studied mathematics before pursuing architecture and used painting as a design tool, drawing inspiration from Suprematism and the Russian avant-garde. Hadid aimed to push the boundaries of Modernism and explore new building possibilities in her designs.

Imhotep: Imhotep was an ancient Egyptian chancellor, architect of Djoser's step pyramid, and high priest of the sun god Ra. Although little is known about him as a historical figure, he was revered and worshipped for over 3,000 years after his death.

Philip Johnson: Philip Johnson was an influential American architect who is renowned for his modern and postmodern designs. Some of his most notable works include the Glass House in Connecticut, the 550 Madison Avenue building in New York City, and the Sculpture Garden of the Museum of Modern Art. His architectural masterpieces are considered iconic of the 20th century.

Louis Kahn: Louis Kahn, an Estonian-born American architect, established his own atelier in 1935 and worked for various firms in Philadelphia. He also served as a design critic and professor at Yale and later at the University of Pennsylvania's School of Design.

Ludwig Mies van der Rohe: Ludwig Mies van der Rohe, a German-American architect and interior designer, is known as one of the pioneers of modern architecture. He is commonly referred to as Mies and his work is highly influential in the field.

Oscar Niemeyer: Oscar Niemeyer, a Brazilian architect, was a key figure in modern architecture. He is renowned for designing civic buildings in Brasília, Brazil's capital, and collaborating on the UN headquarters in New York. Niemeyer's exploration of reinforced concrete aesthetics greatly influenced architecture in the 20th and 21st centuries.

Andrea Palladio: Andrea Palladio, an influential Italian Renaissance architect in the Venetian Republic, drew inspiration from Roman and Greek architecture, particularly Vitruvius. He is renowned for his country houses and villas, although he also designed churches and palaces. His teachings, outlined in his famous treatise, The Four Books of Architecture, earned him widespread recognition for his lasting impact on the field of architecture.

I. M. Pei: Ieoh Ming Pei, a Chinese-American architect, drew inspiration from the garden villas at Suzhou during his upbringing in Shanghai. After moving to the United States in 1935, he enrolled in the University of Pennsylvania before transferring to the Massachusetts Institute of Technology due to his dissatisfaction with the focus on Beaux-Arts architecture. Pei spent his free time researching emerging architects, notably Le Corbusier.

Mimar Sinan: Mimar Sinan, also known as Koca Mi'mâr Sinân Âğâ, was the chief Ottoman architect, engineer, and mathematician during the reigns of Suleiman the Magnificent, Selim II, and Murad III. He oversaw the construction of over 300 significant structures, including the Selimiye Mosque, the Kanuni Sultan Suleiman Bridge, and the Mehmed Paša Sokolović Bridge. His apprentices went on to design the Sultan Ahmed Mosque and the Stari Most bridge.

Albert Speer: Albert Speer, a German architect, was a close associate of Adolf Hitler and served as the Minister of Armaments and War Production in Nazi Germany during World War II. He was convicted at the Nuremberg trial and received a 20-year prison sentence.

Louis Sullivan: Louis Sullivan was a prominent American architect known as the "father of skyscrapers" and "father of modernism." He played a vital role in the Chicago School of architecture and was a mentor to Frank Lloyd Wright. Sullivan's famous principle, "form follows function," emphasized that structure and purpose should determine the design of buildings. His influence extended to the Prairie School of architects in Chicago. Sullivan was awarded the prestigious AIA Gold Medal posthumously in 1944, making him the second architect to receive this honor.

Vitruvius: Vitruvius was a Roman architect and engineer in the 1st century BC. His renowned work, De architectura, is the sole surviving treatise on architecture from antiquity. It is considered the first book on architectural theory and a significant source on classical architecture. The level of originality and importance of his book during his time remains uncertain.

Christopher Wren: Christopher Wren was a highly acclaimed English architect, astronomer, mathematician, and physicist. He is known for his work in the English Baroque style and was responsible for rebuilding 52 churches in London after the Great Fire of 1666. His masterpiece is considered to be St Paul's Cathedral, completed in 1711 on Ludgate Hill.

Frank Lloyd Wright: Frank Lloyd Wright Sr. was a prominent American architect and designer who created over 1,000 structures in a career spanning 70 years. He greatly influenced architectural movements of the twentieth century, teaching and inspiring countless architects through his Taliesin Fellowship and designing in harmony with humanity and the environment, a concept known as organic architecture. Fallingwater (1935), his renowned masterpiece, is regarded as one of the greatest achievements in American architecture.

Georges-Eugène Haussmann: Baron Haussmann, a French official, was appointed by Emperor Napoleon III to transform Paris through a vast urban renewal effort known as Haussmann's renovation. This project included constructing boulevards, parks, and public works. Although criticized for extravagance, Haussmann's vision continues to shape the heart of Paris.

Robert Moses: Robert Moses was a highly influential American urban planner in the early to mid 20th century. He never held elected office, yet his grand infrastructure projects and urban development philosophy greatly impacted New York City and State. Moses' work left a lasting mark, inspiring countless engineers, architects, and urban planners throughout the United States.

Frederick Law Olmsted: Frederick Law Olmsted was an influential American landscape architect known as the father of landscape architecture in the United States. He co-designed famous urban parks like New York's Central Park and worked on other notable projects including Prospect Park in Brooklyn and Cadwalader Park in Trenton, New Jersey. His consultancy, later expanded by his sons, was the leading landscape architecture and planning firm of the late 19th century in the United States, known as Olmsted Brothers.

Raymond Loewy: Raymond Loewy, a French-born American industrial designer, gained immense fame for his influential designs in various industries. Time magazine acknowledged his remarkable contributions, featuring him on its cover on October 31, 1949.

Coco Chanel: Coco Chanel, known as Gabrielle Bonheur, was a French fashion designer and businesswoman. She popularized a casual and sporty feminine style after World War I, replacing the corseted silhouette. Chanel's designs were simpler, more comfortable, and affordable, without sacrificing elegance. She is the only fashion designer on Time magazine's list of the most influential people of the 20th century. Chanel's influence extended to jewelry, handbags, and fragrance, with her iconic Chanel No. 5 perfume. She also created the famous interlocked-CC monogram, which has been in use since the 1920s.

Yves Saint Laurent (designer): Yves Saint Laurent (YSL) was a French fashion designer known for founding his eponymous fashion label in 1962. He is considered one of the most influential designers of the twentieth century. YSL played a key role in reviving couture in the 1960s and establishing the reputation of ready-to-wear fashion.

Shigeru Miyamoto: Shigeru Miyamoto is a highly influential Japanese video game designer, producer, and director at Nintendo. He is known for creating massively popular game franchises such as Mario, Zelda, Donkey Kong, Star Fox, and Pikmin. His creations have collectively sold over 1 billion copies worldwide.

Ansel Adams: Ansel Adams was an American landscape photographer and environmentalist known for his black-and-white images of the American West. He co-founded Group f/64, a photographers' association advocating "pure" photography with sharp focus and a full tonal range. He and Fred Archer created the Zone System, a method to achieve desired prints by understanding tonal range through exposure, development, and printing choices.

Henri Cartier-Bresson: Henri Cartier-Bresson, a renowned French artist and photographer, was a pioneer of street photography and a master of capturing candid moments. He embraced 35mm film and believed in the art of seizing decisive moments through his lens.

Eadweard Muybridge: Eadweard Muybridge, an English photographer, was a pioneer in capturing motion through photography. He also played a significant role in early motion-picture projection. Muybridge chose the name "Eadweard" to reflect its original Anglo-Saxon form, and believed that "Muybridge" was an archaic surname. His notable works include photographs of Yosemite, San Francisco, the Alaskan Territory, subjects related to the Modoc War, and lighthouses along the West Coast. Muybridge conducted his groundbreaking "moving" picture studies in California during the 19th century.

Sergey Prokudin-Gorsky: Sergey Prokudin-Gorsky, a Russian chemist and photographer, revolutionized color photography in early 20th-century Russia. His remarkable efforts aimed to document the country's landscape and culture during this time.

Man Ray: Man Ray was an influential American visual artist, primarily based in Paris. He made significant contributions to the Dada and Surrealist movements, emphasizing his identity as a painter. Man Ray became renowned for his pioneering photography, particularly in fashion and portraits. He also experimented with photograms, known as "rayographs," which showcased his distinct style.

Edward Weston: Edward Weston was a highly influential American photographer known for his innovative and diverse style. He captured a wide range of subjects including landscapes, still lifes, nudes, portraits, and genre scenes. His focus on the American West led to a quintessentially American approach to photography. In 1937, Weston became the first photographer to receive a Guggenheim Fellowship, enabling him to produce numerous notable images. Among his most famous works are photographs of trees and rocks at Point Lobos, California, where he resided for many years.

Joseph Beuys: Joseph Beuys was a influential German artist who explored concepts of humanism, sociology, and creativity. He co-founded the Free International University for Creativity & Interdisciplinary Research and led the development of Performance Art. A member of the Fluxus movement, Beuys was known for his Kunst Aktionen and was a significant inspiration for other artists, such as Allan Kaprow and Carolee Schneemann. His impact is still evident today in performance art groups like BBeyond in Belfast, led by Alastair MacLennan.

Antonio Stradivari: Antonio Stradivari, an Italian luthier renowned for crafting string instruments, notably violins, cellos, and guitars. His instruments are often referred to as Stradivarius or Strad. Stradivari produced 1,116 instruments, with 960 being violins. Today, around 650 of his instruments survive, including 450 to 512 violins. Stradivari's creations are considered exceptional and highly valuable collector's items.

Shitao: Shitao, also known as Shi Tao, was a prominent Chinese Buddhist monk, calligrapher, and landscape painter. He belonged to the Ming dynasty imperial clan, but rose to fame during the early Qing dynasty.

Wang Xizhi: Wang Xizhi, a renowned Chinese politician and writer from the Jin dynasty, is revered as the greatest calligrapher in Chinese history. His expertise in various calligraphic forms, particularly the running script, earned him admiration from Emperor Taizong of Tang. One of his notable works, the Preface to the Poems Composed at the Orchid Pavilion, was buried with the emperor in his mausoleum.

Hokusai: Hokusai, a Japanese ukiyo-e artist, was active during the Edo period, known for his woodblock print series Thirty-Six Views of Mount Fuji. His most famous work, The Great Wave off Kanagawa, became an iconic image. He transformed ukiyo-e from focusing on courtesans and actors to broader themes like landscapes, plants, and animals. Hokusai's works greatly influenced Van Gogh and Monet during the Japonisme movement in 19th-century Europe.

Hiroshige: Hiroshige, originally named Andō Tokutarō, was an influential Japanese ukiyo-e artist who is recognized as the leading figure in the tradition.

Kanō Masanobu: Kanō Masanobu was a prominent Japanese painter known as the founder of the Kanō painting school. He served as chief painter for the Ashikaga shogunate and excelled in creating Zen paintings, as well as intricate artworks featuring Buddhist deities and Bodhisattvas.

Sesshū Tōyō: Sesshū Tōyō, a Japanese Zen monk and painter known as Sesshū, was a great master of Japanese ink painting. Influenced by Chinese landscapes, his work combines a unique Japanese style with Zen Buddhist aesthetics. Sesshū's notable paintings include landscapes, portraits, and bird and flower images, characterized by Zen beliefs, flattened perspective, and bold lines.

Hildegard of Bingen: Hildegard of Bingen, a German Benedictine abbess, was a prolific writer, composer, philosopher, mystic, and visionary during the High Middle Ages. She was also a skilled medical practitioner and writer. Hildegard is renowned for her sacred monophony compositions and is the most recorded composer in modern history. Additionally, she is considered the founder of scientific natural history in Germany.

Guillaume de Machaut: Guillaume de Machaut - Prominent French composer, poet, and central figure of the ars nova style in late medieval music. His death marks the transition from ars nova to ars subtilior. Widely considered the most important composer and poet of the 14th century, he is regarded as the leading European composer of the time.

Josquin des Prez: Josquin des Prez, a French or Franco-Flemish composer of the High Renaissance, was a central figure in the Franco-Flemish School. He greatly influenced 16th-century European music by developing a complex style of expressive polyphony. Josquin emphasized the relationship between text and music and departed from the Renaissance tendency for lengthy melismatic lines. His vocal compositions include masses, motets, and secular chansons.

Guillaume Du Fay: Guillaume Du Fay, a renowned composer and music theorist of the early Renaissance, was regarded as the foremost composer in Europe during his time. His music was highly popular and often performed and reproduced. Although he had strong ties with other composers of the Burgundian School, such as Gilles Binchois, he was not a permanent member of the Burgundian chapel.

Giovanni Pierluigi da Palestrina: Giovanni Pierluigi da Palestrina: Italian composer of late Renaissance music, leading figure of the Roman School, considered the top composer in late 16th-century Europe alongside Orlande de Lassus and Tomás Luis de Victoria.

Johann Sebastian Bach: Johann Sebastian Bach, a German composer, was a renowned musician during the late Baroque period. He is famous for his orchestral music, instrumental compositions, keyboard works, organ works, and vocal music. Since the 19th-century Bach revival, he is widely recognized as one of the greatest composers in Western music history.

George Frideric Handel: George Frideric Handel was a renowned German-British Baroque composer known for his operas, oratorios, anthems, concerti grossi, and organ concertos. His training in Halle, work in Hamburg and Italy, and eventual settlement in London shaped his illustrious career. Influenced by the German choral tradition and Italian Baroque composers, Handel's music represents the pinnacle of the "high baroque" style. He excelled in Italian opera, pioneered English oratorio and organ concerto genres, and introduced a new style to English church music. Handel is widely regarded as one of the greatest composers of his time.

Claudio Monteverdi: Claudio Monteverdi, an influential Italian composer and choirmaster, played a vital role in bridging the gap between the Renaissance and Baroque periods. He is renowned for his contributions to both secular and sacred music, while also being recognized as a pioneer in the advancement of opera.

Henry Purcell: Henry Purcell, an English composer, specialized in Baroque music.

Antonio Vivaldi: Antonio Vivaldi was an influential Italian Baroque composer, virtuoso violinist, and music impresario. He pioneered many developments in orchestration, violin technique, and programmatic music. Vivaldi's influence spread across Europe and he ranks among the greatest Baroque composers. He also consolidated the emerging concerto form and shaped it into a widely accepted style.

Ludwig van Beethoven: Ludwig van Beethoven was a respected German composer and pianist, celebrated for his significant contributions to Western music. His compositions are widely performed, exemplifying the transition from Classical to Romantic music. Divided into early, middle, and late periods, Beethoven's career witnessed his growth as an artist. The middle period was marked by personal development and the emergence of a unique style. Suffering from increasing deafness, he persisted and continued to innovate in his late period, expanding musical form and expression.

Joseph Haydn: Joseph Haydn, an Austrian composer of the Classical period, is known as the "Father of the Symphony" and "Father of the String Quartet." He played a vital role in developing chamber music and musical forms, including the string quartet and piano trio.

Wolfgang Amadeus Mozart: Wolfgang Amadeus Mozart was a highly productive and influential composer of the Classical period, known for composing over 800 works in various genres. His compositions are considered exceptional in symphonic, concertante, chamber, operatic, and choral music. Mozart is widely regarded as one of the greatest composers in Western music history, admired for his beautiful melodies, elegant form, and rich harmony. Despite his short life, his vast musical legacy lives on.

Hector Berlioz: Hector Berlioz was a renowned French Romantic composer and conductor, famous for his diverse and innovative musical compositions. He created symphonies like the Symphonie fantastique and Harold in Italy, as well as choral works including the Requiem and L'Enfance du Christ. Berlioz's operatic works comprised Benvenuto Cellini, Les Troyens, and Béatrice et Bénédict, while his unique creations included the "dramatic symphony" Roméo et Juliette and the "dramatic legend" La Damnation de Faust.

Johannes Brahms: Johannes Brahms was a renowned German composer and pianist from the mid-Romantic period. He spent a significant part of his career in Vienna and is often associated with Johann Sebastian Bach and Ludwig van Beethoven as the "Three Bs" of music. His notable contributions to classical music made him one of the most influential figures in the field.

Anton Bruckner: Anton Bruckner was an Austrian composer known for his symphonies and sacred music. His symphonies are emblematic of Austro-German Romanticism, featuring rich harmonies, strong polyphony, and considerable length. Bruckner's compositions were considered radical due to their dissonances, unprepared modulations, and unique harmonies.

Frédéric Chopin: Frédéric Chopin was a renowned Polish composer and pianist of the Romantic period. Known for his exceptional skill on the piano, he primarily composed solo piano music. Chopin is considered a leading musician of his time, praised for his unique combination of poetic genius and unmatched technical ability.

Antonín Dvořák: Antonín Dvořák, a Czech composer, integrated traditional rhythms and folk elements from Moravia and Bohemia into his music. Following the example of his predecessor Bedřich Smetana, he created a symphonic tradition that effectively incorporated national influences. Dvořák's style is renowned for its ability to recreate a distinct national idiom and skillfully utilize folk influences in his compositions.

Edward Elgar: Edward Elgar, a renowned English composer, created many well-known classical compositions, including the Enigma Variations, Pomp and Circumstance Marches, concertos for violin and cello, and two symphonies. His works are widely performed in British and international classical concerts. Elgar also composed choral works, chamber music, and songs. In 1924, he was honored with the appointment as Master of the King's Musick.

Gilbert and Sullivan: Gilbert and Sullivan were a Victorian-era theatrical partnership consisting of dramatist W. S. Gilbert and composer Arthur Sullivan. They collaborated on fourteen comic operas between 1871 and 1896, including famous works like H.M.S. Pinafore, The Pirates of Penzance, and The Mikado.

Franz Liszt: Franz Liszt, a Hungarian composer and pianist, was a prominent figure during the Romantic period. Having a prolific and influential career that spanned over six decades, he is recognized as one of the most important composers of his time. His piano works remain popular and frequently performed today.

Felix Mendelssohn: Felix Mendelssohn, a renowned German composer and pianist of the early Romantic period, is known for his symphonies, concertos, and chamber music. His famous works include the overture for A Midsummer Night's Dream, the Italian Symphony, the oratorio Elijah, and the melody in "Hark! The Herald Angels Sing". His Songs Without Words are his most renowned solo piano compositions.

Modest Mussorgsky: Modest Mussorgsky was a Russian composer, part of "The Five" group, and an innovator of Russian music in the Romantic era. He aimed to create a distinct Russian musical identity, often challenging Western music conventions.

Nikolai Rimsky-Korsakov: Nikolai Rimsky-Korsakov was a prominent Russian composer and member of The Five. He was highly skilled in orchestration and his most famous works include Capriccio Espagnol, Russian Easter Festival Overture, and Scheherazade. He frequently drew inspiration from fairy tales and folk subjects in his compositions.

Gioachino Rossini: Gioachino Rossini, an Italian composer, achieved fame with his 39 operas but also composed songs, chamber music, piano pieces, and sacred music. He revolutionized both comic and serious opera, setting new standards. Surprisingly, he retired from composing in his thirties, at the peak of his popularity.

Franz Schubert: Franz Schubert, an Austrian composer of the late Classical and early Romantic eras, was known for his extensive musical output despite his short life. His works spanned various genres including over 600 secular vocal pieces, symphonies, sacred music, operas, piano and chamber music. Some of his renowned compositions include the art songs Erlkönig, Gretchen am Spinnrade, and Ave Maria, as well as the Trout Quintet and Symphony No. 8 in B minor. He also composed the well-known String Quartet No. 14 "Death and the Maiden," String Quintet, Impromptus for solo piano, and the song cycles Die schöne Müllerin, Winterreise, and Schwanengesang.

Clara Schumann: Clara Schumann, a German pianist and composer, was a highly influential figure during the Romantic era. With a 61-year concert career, she revolutionized piano recitals by shifting away from purely virtuosic works. Known for her solo piano pieces, concerto, chamber music, choral compositions, and songs, she left an enduring impact on music.

Robert Schumann: Robert Schumann was a highly influential German composer and pianist of the Romantic era. Despite initially pursuing a career as a virtuoso pianist, a hand injury forced him to shift his focus to composing. He is widely regarded as one of the greatest composers of his time.

Johann Strauss II: Johann Strauss II, also known as Johann Strauss Jr., was an Austrian composer and violinist. He was famous for his light music, including over 500 waltzes, polkas, and other dance music. Strauss popularized the waltz in nineteenth-century Vienna, earning him the title "The Waltz King". His notable works include "The Blue Danube", "Kaiser-Walzer", and "Tales from the Vienna Woods". He also composed operettas like "Die Fledermaus" and "Der Zigeunerbaron".

Pyotr Ilyich Tchaikovsky: Pyotr Ilyich Tchaikovsky was a renowned Russian composer during the Romantic period. He was the first Russian composer to establish a global influence. His compositions encompass beloved works such as Swan Lake, The Nutcracker, and the 1812 Overture. Tchaikovsky also created remarkable symphonies, concertos, and operas, including the popular Eugene Onegin.

Giuseppe Verdi: Giuseppe Verdi was an influential Italian composer known for his operas. Born into a modest family near Busseto, he received a musical education with the support of a local patron. Verdi became a leading figure in Italian opera, following the era of Rossini, Bellini, and Donizetti, whose works had a significant impact on him.

Richard Wagner: Richard Wagner was a German composer known for his operas. He wrote both the libretto and music for his stage works, revolutionizing opera with his concept of the Gesamtkunstwerk, which combined poetry, visuals, music, and drama. He fully realized this vision in the four-opera cycle, Der Ring des Nibelungen.

Gabriel Fauré: Gabriel Fauré, a French composer, organist, pianist, and teacher, was an influential figure in 20th-century music. His notable works include the Pavane, Requiem, Sicilienne, and nocturnes for piano. Fauré's musical style had a profound impact on his peers and he composed his most celebrated pieces in his later years, showcasing a sophisticated and intricate harmony and melody.

Gustav Mahler: Gustav Mahler was a prominent Austro-Bohemian composer and conductor who bridged the gap between 19th-century Austro-German tradition and early 20th-century modernism. While he achieved renown as a conductor in his lifetime, his own music gained widespread popularity only after being neglected and banned during the Nazi era. However, Mahler's compositions were rediscovered after 1945, making him one of the most frequently performed and recorded composers. His enduring influence has extended into the 21st century.

Giacomo Puccini: Giacomo Puccini, an Italian composer, is renowned for his operas. He is considered the greatest after Verdi, descending from a line of composers in the late-Baroque era. Initially rooted in the Romantic Italian opera tradition, he later became a leading figure in the realistic verismo style.

Sergei Rachmaninoff: Sergei Rachmaninoff was a renowned Russian composer, pianist, and conductor. He is considered as one of the greatest pianists in his time and a notable representative of Romanticism in Russian classical music. Influenced by Tchaikovsky and other Russian composers, Rachmaninoff developed a distinctive style characterized by expressive melodies, intricate counterpoint, and vibrant orchestration. His compositions prominently showcase the piano, which he skillfully explored both technically and emotionally.

Jean Sibelius: Jean Sibelius was a Finnish composer known for his late Romantic and early-modern music. He is celebrated as Finland's greatest composer and his work played a significant role in strengthening the national identity of Finland during a period of Russian influence in the late 19th century.

Richard Strauss: Richard Strauss was a renowned German composer and conductor known for his impactful tone poems and operas. He is regarded as a leading figure in late Romantic and early modern music, following in the footsteps of influential composers Richard Wagner and Franz Liszt. Alongside Gustav Mahler, Strauss represented the pinnacle of German Romanticism, blending innovative orchestration with a progressive harmonic style.

Béla Bartók: Béla Bartók was a highly influential Hungarian composer, pianist, and ethnomusicologist of the 20th century. He is recognized as one of Hungary's greatest composers, alongside Franz Liszt. Bartók's groundbreaking work in analyzing and collecting folk music established him as a pioneer of comparative musicology, later known as ethnomusicology.

Benjamin Britten: Benjamin Britten, Baron Britten, was a prominent English composer, conductor, and pianist of the 20th century. He is known for his wide repertoire, including opera, vocal music, orchestral, and chamber pieces. Notable works include the acclaimed opera Peter Grimes, the War Requiem, and the popular orchestral showcase The Young Person's Guide to the Orchestra.

Aaron Copland: Aaron Copland was an influential American composer, conductor, critic, writer, and teacher. He is known as the "Dean of American Composers" and his music reflects the spirit of the American landscape. Copland is renowned for his accessible and populist style, seen in works like Appalachian Spring, Billy the Kid, and Rodeo. Alongside ballets and orchestral pieces, he composed in various genres including chamber music, vocal works, opera, and film scores.

Claude Debussy: Claude Debussy, a French composer, was influential during the late 19th and early 20th centuries. He is considered a precursor of Impressionist music, despite his denial of the label.

George Gershwin: George Gershwin was a celebrated American composer and pianist known for his diverse musical styles. His notable compositions included the orchestral works "Rhapsody in Blue" and "An American in Paris," as well as popular songs like "Swanee" and "Fascinating Rhythm." Gershwin also created jazz classics like "Embraceable You" and "I Got Rhythm," and his opera "Porgy and Bess" featured the beloved song "Summertime."

Sergei Prokofiev: Sergei Prokofiev, a renowned Russian composer, pianist, and conductor, is considered one of the major composers of the 20th century. His diverse creations include masterpieces in various music genres. Prokofiev's notable works comprise the March from The Love for Three Oranges, the Lieutenant Kijé suite, the ballet Romeo and Juliet, along with the famous "Dance of the Knights," and the beloved children's piece, Peter and the Wolf. Remarkably prolific, Prokofiev completed seven operas, symphonies, ballets, piano and violin concertos, a cello concerto, and nine piano sonatas throughout his career.

Maurice Ravel: Maurice Ravel, a French composer, pianist, and conductor, is often linked to Impressionism despite rejecting the term. In the 1920s and 1930s, he was acclaimed as France's preeminent living composer.

Arnold Schoenberg: Arnold Schoenberg, an Austrian-American composer, was a prominent figure in 20th-century music. He was a leader of the Second Viennese School and associated with expressionism. Schoenberg's works were labeled as degenerate music by the Nazis. He emigrated to the United States in 1933, where he became an American citizen in 1941.

Dmitri Shostakovich: Dmitri Shostakovich: Soviet-era Russian composer and pianist, famous for his First Symphony in 1926. Considered a significant composer internationally.

Igor Stravinsky: Igor Stravinsky, a Russian composer with French and American citizenship, was a highly influential figure in 20th-century music, particularly in the realm of modernist music.

Ralph Vaughan Williams: Ralph Vaughan Williams, an influential English composer, crafted a diverse array of works spanning operas, ballets, chamber music, vocal pieces, and symphonies. Over six decades, his compositions showcased a distinct departure from the 19th-century German-influenced British music, drawing inspiration from Tudor music and English folk-song.

Pierre Boulez: Pierre Boulez, a prominent French composer and conductor, founded multiple musical institutions. He played a significant role in post-war contemporary classical music.

John Cage: John Cage was an influential American composer and music theorist known for his pioneering work in indeterminacy and electroacoustic music. He was a leading figure in the post-war avant-garde and considered one of the most influential composers of the 20th century. Cage also made significant contributions to modern dance, particularly through his partnership with choreographer Merce Cunningham.

Philip Glass: Philip Glass is an influential American composer and pianist known for his minimalist style of music, characterized by repetitive phrases and shifting layers. He is regarded as one of the most significant composers of the late 20th century and has helped evolve music with repetitive structures.

György Ligeti: György Ligeti, a Hungarian-Austrian composer, is regarded as a significant avant-garde figure in contemporary classical music. His innovative and influential compositions have left a lasting impact in the latter half of the 20th century.

Karlheinz Stockhausen: Karlheinz Stockhausen, a German composer, is recognized as a highly influential and contentious figure in 20th and 21st-century music. He made significant contributions to electronic music, pioneered controlled chance in serial composition, and embraced the concept of musical spatialization.

Scott Joplin: Scott Joplin, an African-American composer and pianist, was known as the "King of Ragtime." He composed over 40 ragtime pieces, a ragtime ballet, and two operas. His most famous work, the "Maple Leaf Rag," was the first influential hit in the ragtime genre. Joplin believed that ragtime should be performed in concert halls, not in saloons, and he considered it a form of classical music.

Nadia Boulanger: Nadia Boulanger, a French music teacher, conductor, and composer, was influential in the 20th century. She taught renowned composers and musicians, while showcasing her own talents as a pianist and organist.

Pablo Casals: Pablo Casals, also known as Pau Casals i Defilló, was a renowned Spanish and Puerto Rican cellist, conductor, and composer. He left a notable legacy through his extensive recordings of solo, chamber, and orchestral music, particularly his interpretation of Bach's Cello Suites. In recognition of his accomplishments, Casals was honored with the Presidential Medal of Freedom in 1963 by President John F. Kennedy.

Mstislav Rostropovich: Mstislav Rostropovich, a prominent Russian cellist and conductor, revolutionized the cello repertoire by inspiring and premiering more than 100 new works. His exceptional interpretations and technique earned him admiration and long-term collaborations with renowned composers such as Dmitri Shostakovich, Sergei Prokofiev, and Benjamin Britten. Through his artistic partnerships, Rostropovich significantly expanded the cello's musical possibilities, leaving an enduring legacy in the world of classical music.

Leonard Bernstein: Leonard Bernstein, an American conductor and composer, was celebrated as one of the most influential musicians of his era. He was the first American-born conductor to achieve global recognition and was highly regarded by critics for his immense talent. Bernstein garnered numerous accolades, including seven Emmy Awards, two Tony Awards, 16 Grammy Awards, and a nomination for an Academy Award. In 1981, he was honored with the Kennedy Center Honor for his groundbreaking contributions to music.

Herbert von Karajan: Herbert von Karajan was a prominent Austrian conductor known for his long tenure as the principal conductor of the Berlin Philharmonic. He made his mark during the Nazi era, conducting at renowned festivals and opera houses. Widely recognized as one of the greatest conductors of the 20th century, he gained both fame and controversy. Karajan's extensive discography, with an estimated 200 million records sold, cemented him as the top-selling classical music recording artist ever.

Arturo Toscanini: Arturo Toscanini, an Italian conductor, was an influential musician known for his intensity, perfectionism, and exceptional memory. He held positions at La Scala and the New York Philharmonic, and later became the first music director of the NBC Symphony Orchestra. His radio and television broadcasts and numerous recordings made him a household name in the United States.

Glenn Gould: Glenn Gould, a Canadian classical pianist, was renowned for his interpretation of Johann Sebastian Bach's keyboard works. He was considered one of the most celebrated and famous pianists of the 20th century, known for his exceptional technical skills and ability to bring out the contrapuntal intricacies of Bach's music.

Vladimir Horowitz: Vladimir Horowitz, a notable Russian-American pianist, was renowned for his exceptional skill, impressive technique, and the electrifying impact he had on audiences. His talent and unique timbre solidified his status as one of the greatest pianists in history.

Sviatoslav Richter: Sviatoslav Richter was a highly acclaimed Soviet and Russian classical pianist. He is widely considered one of the greatest pianists ever, known for his profound interpretations, virtuoso skills, and extensive repertoire.

Arthur Rubinstein: Arthur Rubinstein was a Polish-American pianist, widely recognized as one of the greatest of all time. He received international acclaim for his exceptional interpretation of Chopin's music. His career spanned eight decades, during which he captivated audiences with performances of various composers' works.

Maria Callas: Maria Callas, an American-born Greek soprano, was a highly influential opera singer of the 20th century. She was praised for her bel canto technique, versatile voice, and emotionally powerful performances. Callas excelled in a wide range of repertoire, from classical opera seria to the works of Verdi, Puccini, and Wagner. Her exceptional musical and dramatic talents earned her the title of "La Divina."

Enrico Caruso: Enrico Caruso, an Italian operatic tenor, achieved tremendous success at major opera houses in Europe and the Americas. Known for his exceptional range, he performed a diverse repertoire of roles encompassing lyrical and dramatic styles. Caruso was one of the first highly recorded singers, making 247 commercially released recordings from 1902 to 1920, catapulting him to international stardom in the entertainment industry.

Plácido Domingo: Plácido Domingo is a renowned Spanish opera singer, conductor, and arts administrator. With over a hundred recorded operas, he is known for his versatility in performing in multiple languages. Primarily a lirico-spinto tenor, he excelled in iconic roles like Cavaradossi, Hoffmann, Don José, and Canio. Domingo later ventured into more dramatic parts, becoming celebrated as the leading Otello of his time. In recent years, he shifted to baritone roles, notably exemplified by Simon Boccanegra. Throughout his career, Domingo has performed an impressive 151 different roles.

Dietrich Fischer-Dieskau: Dietrich Fischer-Dieskau was a renowned German lyric baritone and conductor. He gained fame for his exceptional performances of Franz Schubert's Lieder, especially the iconic "Winterreise." Even today, his recordings of these works, accompanied by Gerald Moore and Jörg Demus, continue to receive critical acclaim 50 years later.

Kirsten Flagstad: Kirsten Flagstad was a renowned Norwegian opera singer and considered the most remarkable Wagnerian soprano of her time. Her legendary debut in New York in 1935 made her one of the greatest opera singers. Giulio Gatti-Casazza, the former General Manager of the Metropolitan Opera, described her as one of America's greatest gifts, alongside Caruso.

Luciano Pavarotti: Luciano Pavarotti, the renowned Italian tenor, effortlessly bridged the gap between opera and popular music to become one of the most celebrated tenors in history. With his exceptional tone, he earned the moniker "King of the High Cs." Pavarotti's global recognition stemmed from his extensive collection of opera recordings and individual arias.

Joan Sutherland: Joan Sutherland, an Australian soprano, was a prominent figure in the revival of bel canto music during the late 1950s to the 1980s. Known for her dramatic coloratura style, she made significant contributions to this repertoire.

Niccolò Paganini: Niccolò Paganini, an Italian violinist and composer, was a renowned virtuoso and a leading figure in modern violin technique. His famous composition, 24 Caprices for Solo Violin Op. 1, not only established his fame but also inspired numerous prominent composers.

Muthuswami Dikshitar: Muthuswami Dikshitar (1776-1835) was a renowned composer and musician of Indian classical music. He was born in Tamil Nadu and is considered one of the trinity of Carnatic music. Dikshitar's compositions, known for their poetic descriptions and emphasis on veena-style gamakas, capture the essence of Hindu gods and temples. With around 500 widely sung and played compositions, his legacy continues to influence classical concerts.

Tyagaraja: Tyagaraja was a renowned composer and vocalist of Carnatic music, a form of Indian classical music. Alongside Shyama Shastri and Muthuswami Dikshitar, he is considered as one of the Trinity of Carnatic music. Tyagaraja primarily composed devotional songs in Telugu, praising Rama, with thousands of his compositions remaining popular today. One of his most famous compositions is "Nagumomu." He is noted for the Pancharatna Kritis, five compositions often sung in his honor, and the Utsava Sampradaya Krithis, frequently performed during temple rituals.

Syama Sastri: Syama Sastri, also known as Shyama Shastri, was a renowned musician and composer in Carnatic music. He was part of a trio that included Tyagaraja and Muthuswami Dikshitar, and is considered the eldest among them.

Ali Akbar Khan: Ali Akbar Khan, an Indian Hindustani classical musician, was renowned for his skill in playing the sarod. Trained by his father, he composed classical ragas and film scores. In 1956, he founded a music school in Calcutta and later established the Ali Akbar College of Music in the United States, currently located in San Rafael, California, with a branch in Basel, Switzerland.

Ravi Shankar: Ravi Shankar, an Indian sitarist and composer, was a renowned virtuoso of North Indian classical music. He influenced musicians worldwide and was honored with India's highest civilian award, the Bharat Ratna, in 1999.

Mohammad-Reza Shajarian: Mohammad-Reza Shajarian was a renowned Iranian singer, calligrapher, and humanitarian. He began his singing career in 1959 and became known for his unique vocal style. Shajarian was trained by notable masters of Persian traditional music and was influenced by legendary tar soloist Jalil Shahnaz. He was admired for his mastery of Persian calligraphy and his involvement in humanitarian activities.

Nusrat Fateh Ali Khan: Nusrat Fateh Ali Khan was a renowned Pakistani singer and songwriter, primarily known for his mesmerizing qawwali performances. Often referred to as the "Shahenshah-e-Qawwali," Khan is considered one of the greatest qawwali singers of all time. He possessed exceptional vocal abilities and could sustain intense performances for hours. Widely recognized for his contributions, he introduced qawwali music to global audiences and was also well-versed in Hindustani classical music.

Stephen Foster: Stephen Foster, known as "the father of American music", was a Romantic period composer. He wrote over 200 songs, including popular ones like "Oh! Susanna" and "Camptown Races". He is also known for his compositions "Hard Times Come Again No More", "Old Folks at Home", "Jeanie with the Light Brown Hair", "Old Black Joe", and "Beautiful Dreamer".

John Gielgud: John Gielgud was a renowned English actor and theatre director known for his illustrious career spanning eight decades. Alongside Ralph Richardson and Laurence Olivier, he was part of a trio of actors dominating the British stage in the 20th century. Descending from the Terry family of theatre performers, Gielgud started his acting journey in 1922 with his cousin's company, Phyllis Neilson-Terry. Following his education at the Royal Academy of Dramatic Art, he worked in various theatre productions before making a name for himself as a Shakespearean performer at the esteemed Old Vic theater from 1929 to 1931.

Humphrey Bogart: Humphrey Bogart, also known as Bogie, was an iconic American actor known for his performances in classic Hollywood films. He is considered a cultural icon and was recognized by the American Film Institute as the greatest male star of classic American cinema in 1999.

Marlon Brando: Marlon Brando Jr. was a highly acclaimed American actor and activist. He is regarded as one of the greatest actors of the 20th century and received numerous prestigious awards during his six-decade-long career, including two Academy Awards. Brando played a pivotal role in introducing the Stanislavski system and method acting to mainstream audiences.

James Cagney: James Cagney was a highly acclaimed American actor, dancer, and film director known for his energetic performances, unique voice, and comedic timing. He achieved recognition and received numerous awards for his versatile talent in a variety of roles.

Gary Cooper: Gary Cooper was a highly acclaimed American actor known for his quiet and powerful on-screen presence. He received two Academy Awards for Best Actor and was nominated three more times. In recognition of his career accomplishments, he was also awarded an Academy Honorary Award in 1961. Cooper was consistently ranked as one of the top film personalities for over two decades and was also recognized as one of the highest-earning stars for 18 years. The American Film Institute (AFI) ranked him 11th on their list of the greatest male stars in classic Hollywood cinema.

Robert De Niro: Robert De Niro is a highly influential American actor known for his collaborations with Martin Scorsese. He has received numerous accolades, including two Academy Awards, a Golden Globe, and a Presidential Medal of Freedom. De Niro is considered one of the most influential actors of his generation.

Henry Fonda: Henry Fonda was an American actor known for his roles that represented the average person. He had a successful career in both Broadway and Hollywood, spanning five decades.

Clark Gable: Clark Gable, known as the 'King of Hollywood', was a prominent American film actor. With a career spanning 37 years, he appeared in 60+ movies across different genres. Gable spent three decades as a leading man, earning the title of the seventh greatest male movie star of classic American cinema, according to the American Film Institute.

Cary Grant: Cary Grant was an English-American actor known for his suave style, charming persona, and comedic talent. He received multiple Academy Award nominations and was honored with an Academy Honorary Award in 1970. Grant was recognized as one of the leading men of classic Hollywood and was ranked the second greatest male star of the Golden Age of Hollywood by the American Film Institute.

Tom Hanks: Tom Hanks is an American actor and filmmaker known for his comedic and dramatic roles. He is a highly popular and recognizable film star worldwide, regarded as an American cultural icon. Hanks' films have grossed over $9.96 billion globally, making him the fourth-highest-grossing actor in North America. He has received numerous prestigious honors, including the AFI Life Achievement Award, Kennedy Center Honor, Presidential Medal of Freedom, French Legion of Honor, and Golden Globe Cecil B. DeMille Award.

Jack Nicholson: Jack Nicholson is an esteemed American actor and filmmaker, known as one of the greatest of his generation. With a career spanning five decades, he has appeared in 80 films, earning three Academy Awards, three BAFTA Film Awards, and six Golden Globe Awards, among others. He received recognition from the American Film Institute and the Kennedy Center for his outstanding contributions. Nicholson often portrayed rebellious characters challenging societal norms.

Gregory Peck: Gregory Peck, an American actor, was a highly popular film star from the 1940s to the 1970s. He was recognized as the 12th-greatest male star of Classic Hollywood Cinema by the American Film Institute in 1999.

Sidney Poitier: Sidney Poitier was a Bahamian-American actor, film director, and diplomat. He made history as the first Black actor and first Bahamian to win the Academy Award for Best Actor in 1964. He also received numerous accolades, including two Golden Globe Awards, a BAFTA Award, and a Grammy Award. Poitier was recognized as one of the "American Film Institute's 100 Stars" in 1999. As one of the last surviving stars from Hollywood's Golden Age, his contributions to cinema are significant.

James Stewart: James Stewart (1908-1997) was an iconic American actor known for his distinctive voice and everyman persona. He appeared in 80 films over a career spanning almost six decades, capturing the essence of the "American ideal" with his strong moral characters. Considered one of the greatest male actors in American cinema, he received numerous honors, including the AFI Life Achievement Award, the Kennedy Center Honor, and the Academy Honorary Award. Stewart's contributions to film and society were recognized with the Presidential Medal of Freedom in 1985.

Spencer Tracy: Spencer Tracy was a highly acclaimed American actor known for his natural style and versatility. He won two consecutive Academy Awards for Best Actor and received nine nominations overall. With a career spanning 75 films, Tracy earned a reputation as one of the screen's greatest actors. In 1999, he was ranked as the 9th greatest male star of Classic Hollywood Cinema by the American Film Institute.

Rudolph Valentino: Rudolph Valentino, born Rodolfo Guglielmi, was an Italian actor known for his roles in popular silent films. He gained fame as "The Latin Lover" in the United States, starring in iconic movies like The Four Horsemen of the Apocalypse, The Sheik, Blood and Sand, The Eagle, and The Son of the Sheik.

John Wayne: John Wayne, born Marion Robert Morrison, was an American actor known as The Duke or Duke Wayne. He achieved popularity during Hollywood's Golden Age through his leading roles in Western and war films. With a career spanning from the 1920s to the American New Wave, he appeared in 179 film and TV productions. Wayne was a top box-office draw for three decades and starred alongside other iconic Hollywood figures. In 1999, the American Film Institute recognized him as one of the greatest male stars in classic American cinema.

Amitabh Bachchan: Amitabh Bachchan is a highly acclaimed Indian actor in Hindi cinema, known for his pivotal roles in over 200 films spanning five decades. He is widely recognized as one of the most influential and accomplished actors in Indian cinema, earning titles such as the Shahenshah of Bollywood, Sadi Ke Mahanayak, Star of the Millennium, or simply Big B. His dominance in the Indian film industry during the 1970s-80s was so significant that it was described as a "one-man industry" by French director François Truffaut.

Jackie Chan: Jackie Chan is a renowned Hong Kong actor, filmmaker, martial artist, and stuntman. He is known for his acrobatic fighting style, comic timing, and innovative stunts, which he performs himself. Prior to his film career, he trained in acrobatics, martial arts, and acting at the China Drama Academy. With over 150 films, Chan is considered one of the most influential action film stars ever.

Toshiro Mifune: Toshiro Mifune was a renowned Japanese actor and producer known for his exceptional performances in Akira Kurosawa's historical films. His most notable works include Rashomon, Seven Samurai, Throne of Blood, The Hidden Fortress, and Yojimbo. Additionally, Mifune portrayed iconic characters like Miyamoto Musashi in Samurai Trilogy, Lord Toranaga in the miniseries Shōgun, and Admiral Isoroku Yamamoto in various films.

Rajinikanth: Rajinikanth, born Shivaji Rao Gaikwad, is an iconic Indian actor known for his work in Tamil cinema. With a career of over five decades, he has appeared in 169 films in various languages including Tamil, Hindi, Telugu, Kannada, Bengali, and Malayalam. Rajinikanth is renowned for his distinctive dialogue delivery and unique mannerisms on-screen, which have garnered him a massive international fan base, making him one of the most successful and popular actors in Indian cinema history. Recognized for his contributions to the industry, he received the prestigious Padma Bhushan in 2000, Padma Vibhushan in 2016, and the Dadasaheb Phalke Award in 2019, the highest honor in Indian cinema.

Sean Connery: Sean Connery, a Scottish actor, is most well-known for being the first to portray James Bond, a British secret agent, in seven films from 1962 to 1983. He originated the role in "Dr. No" and continued to star in films like "Goldfinger" and "Diamonds Are Forever." He made his final appearance in the franchise in "Never Say Never Again." Connery's contribution to the Bond series is highly significant and cemented his status as a legendary actor.

Alain Delon: Alain Delon, a French actor, filmmaker, and businessman, was a prominent figure in European cinema during the 1960s-1980s. Known as a sex symbol, he won the César Award for Best Actor in 1985 and received the Honorary Golden Bear at the Berlin International Film Festival. In 1991, he became a member of France's Legion of Honour and in 2019, he received the Honorary Palme d'Or at the Cannes Film Festival.

Jean Gabin: Jean Gabin was a celebrated French actor and singer, renowned for his contributions to French cinema. He starred in numerous iconic films such as Pépé le Moko, La grande illusion, Le Quai des brumes, La bête humaine, Le jour se lève, and Le plaisir. Gabin's talent was recognized internationally, earning him the Silver Bear for Best Actor twice at the Berlin International Film Festival and the Volpi Cup for Best Actor at the Venice Film Festival. He was also honored with membership in the Légion d'honneur for his significant role in shaping the French film industry.

Alec Guinness: Alec Guinness was an English actor known for his roles in Ealing comedies like 'Kind Hearts and Coronets' and 'The Lavender Hill Mob.' He collaborated multiple times with director David Lean, winning an Academy Award for 'The Bridge on the River Kwai.' Guinness also portrayed Obi-Wan Kenobi in the original 'Star Wars' trilogy, earning a nomination for Best Supporting Actor.

Klaus Kinski: Klaus Kinski was a renowned German actor known for his intense performances and volatile personality. He appeared in over 130 films from 1948 to 1988, with his most notable work being in five films directed by Werner Herzog. Their tumultuous relationship was later documented in the documentary My Best Fiend.

Marcello Mastroianni: Marcello Mastroianni, an Italian film actor, is celebrated as one of Italy's most iconic performers of the 20th century. He starred in numerous films for top Italian directors over his impressive career, spanning 1939 to 1997. Mastroianni received international recognition with prestigious awards, including 2 BAFTAs, 2 Best Actor prizes at the Venice and Cannes festivals, 2 Golden Globes, and 3 Academy Award nominations.

Laurence Olivier: Laurence Olivier was a prominent English actor and director, known for his dominance on the British stage during the mid-20th century. He also played over fifty roles in films, and later achieved significant success in television.

Peter O'Toole: Peter O'Toole was an acclaimed English stage and film actor known for his Shakespearean performances. He gained recognition at the Bristol Old Vic and the English Stage Company before making his West End debut in 1959. O'Toole played the title role in Hamlet in the National Theatre's inaugural production in 1963. Alongside his successful career, he was known for his notorious off-stage behavior.

Sarah Bernhardt: Sarah Bernhardt was a renowned French stage actress who starred in popular plays of the late 19th and early 20th centuries. She excelled in dramatic roles, including in works by Dumas, Hugo, and Sardou, and even portrayed male characters like Hamlet. Known for her powerful voice and expressive gestures, she toured internationally and was one of the first actresses to record sound and act in movies.

Mary Pickford: Mary Pickford, also known as Gladys Marie Smith, was a Canadian actress, producer, screenwriter, and film studio founder. Her Hollywood career lasted five decades, making her a pioneer in the US film industry.

Lauren Bacall: Lauren Bacall, born Betty Joan Perske, was a highly acclaimed American actress. She was recognized for her captivating on-screen presence, distinctive husky voice, and alluring allure. Named as the 20th-greatest female star of classic Hollywood cinema by the American Film Institute, Bacall received an Academy Honorary Award in 2009 for her contributions to the Golden Age of motion pictures. She was one of the last surviving major stars from that era.

Claudette Colbert: Claudette Colbert, born Émilie Chauchoin, was a prominent American actress known for her work in both Broadway productions and films. She started her career in the late 1920s and transitioned to movies during the era of talking pictures. Unlike many of her contemporaries, Colbert worked independently from the studio system, making her one of the few notable actresses of the time to do so.

Joan Crawford: Joan Crawford, an American actress, rose to fame in the 1920s and 1930s through her breakthrough with Metro-Goldwyn-Mayer. She crafted an image as a flapper, gaining recognition and popularity. Notably, Crawford excelled as hardworking heroines achieving success against the odds. Although she became one of Hollywood's highest-paid actresses, her career later suffered setbacks, earning her the unfortunate label of "box office poison."

Bette Davis: Bette Davis was a prolific American actress whose career spanned over 50 years and included over 100 acting credits. She was known for her portrayal of unsympathetic and sardonic characters across various film genres, from crime melodramas to historical films and suspense horror. Although she also appeared in comedies, her greatest successes came from romantic dramas. Davis received two Academy Awards and holds the record for the first actor to be nominated ten times.

Doris Day: Doris Day, the American actress and singer, gained fame as a big band singer in 1939. She achieved commercial success in 1945 with hit songs like "Sentimental Journey" and "My Dreams Are Getting Better All the Time." In addition to her collaboration with Les Brown and His Band of Renown, she went on to record over 650 songs during her solo career from 1947 to 1967.

Greta Garbo: Greta Garbo, a Swedish-American actress, was renowned for her melancholic and somber persona, and her portrayal of tragic characters. Considered one of the greatest screen actresses of all time, she was praised for her subtle and understated performances. In 1999, the American Film Institute ranked her fifth among the greatest female stars of classic Hollywood cinema.

Judy Garland: Judy Garland was a highly acclaimed American actress, singer, and recording artist. She achieved international fame for her versatility in both musical and dramatic roles. Garland received numerous awards, including an Academy Juvenile Award, a Golden Globe Award, and a Special Tony Award. She also made history as the first woman to win the Grammy Award for Album of the Year with her live recording, "Judy at Carnegie Hall," released in 1961.

Lillian Gish: Lillian Gish was a renowned American actress, director, and screenwriter. With a career spanning 75 years, she started in silent film shorts in 1912, revolutionizing film performance techniques. Regarded as the "First Lady of American Cinema," Gish was ranked as the 17th greatest female movie star of Classic Hollywood cinema by the American Film Institute in 1999.

Rita Hayworth: Rita Hayworth, an American actress, rose to fame in the 1940s as one of Hollywood's biggest stars. With a career spanning 37 years, she appeared in 61 films. Nicknamed "The Love Goddess," Hayworth became an iconic symbol of glamour in the 1940s and was the preferred pin-up girl for soldiers during World War II.

Katharine Hepburn: Katharine Hepburn was a legendary American actress known for her strong and independent characters. She was recognized for her spirited personality and outspokenness on and off-screen. Hepburn's career spanned six decades, during which she excelled in various genres, receiving four Academy Awards for Best Actress. In 1999, the American Film Institute named her the greatest female star of classic Hollywood cinema.

Grace Kelly: Grace Kelly was an American actress and Princess of Monaco. She married Prince Rainier III in 1956 and remained married until her death in 1982. Before her marriage, she starred in notable films in the 1950s. Kelly is renowned as an iconic actress from the Golden Age of Hollywood. She received an Academy Award and three Golden Globe Awards, and was recognized as the 13th greatest female star by the American Film Institute.

Marilyn Monroe: Marilyn Monroe was a popular American actress, singer, and model known for her iconic portrayal of "blonde bombshell" characters. She became a symbol of the sexual revolution in the 1950s and early 1960s and was a highly sought-after actress whose films grossed $200 million. Even after her passing in 1962, Monroe continues to be a significant pop culture icon, recognized as the sixth-greatest female screen legend from Hollywood's Golden Age by the American Film Institute in 1999.

Barbara Stanwyck: Barbara Stanwyck, an American actress, model, and dancer, had a remarkable 60-year career. Known for her powerful on-screen presence and versatility, she worked with esteemed directors such as Cecil B. DeMille, Fritz Lang, and Frank Capra. Stanwyck starred in 85 films over 38 years before transitioning to television.

Meryl Streep: Meryl Streep, an acclaimed American actress known for her versatility and adaptability, is often regarded as the best actress of her generation. With a career spanning over four decades, Streep has received numerous accolades including 21 Academy Award nominations, winning three, and 33 Golden Globe Award nominations, winning eight.

Shirley Temple: Shirley Temple Black, an American actress, singer, dancer, and diplomat, ruled Hollywood as the top child actress between 1934 and 1938. Later becoming a US Ambassador to Ghana and Czechoslovakia, she also held the role of Chief of Protocol for the United States.

Mae West: Mae West was a famous American actress, singer, comedian, screenwriter, and playwright. Known for her sexual independence and witty double entendres, she had a career spanning over seven decades. She started in vaudeville and stage in New York before transitioning to Hollywood to pursue a film career.

Setsuko Hara: Setsuko Hara, the renowned Japanese actress, gained fame for her roles in Yasujirō Ozu's Late Spring and Tokyo Story. Prior to collaborating with Ozu, she had already acted in 67 films.

Madhubala: Madhubala, an iconic Indian actress, achieved remarkable success during the post-independence era. With a career spanning over 20 years, she appeared in over 60 Hindi-language films. Despite her relatively short active period of only a decade, Madhubala became one of India's highest-paid entertainers. Her untimely death in 1969 marked the end of a phenomenal career.

Julie Andrews: Julie Andrews, an English actress, singer, and author, is widely recognized for her incredible career spanning over seven decades. She has received numerous prestigious awards, including an Academy Award, a BAFTA Award, two Emmy Awards, three Grammy Awards, and six Golden Globe Awards. Andrews was a major box office draw in the 1960s and has been honored with the Kennedy Center Honors, the Screen Actors Guild Life Achievement Award, and the AFI Life Achievement Award. In 2000, she was made a Dame by Queen Elizabeth II for her remarkable contributions.

Ingrid Bergman: Ingrid Bergman, a Swedish actress, was highly influential in the film industry, with a career spanning five decades. She won multiple prestigious awards, including three Academy Awards and four Golden Globe Awards. In 1999, Bergman was recognized by the American Film Institute as the fourth greatest female screen legend of Classic Hollywood Cinema.

Marlene Dietrich: Marlene Dietrich, a German and American actress and singer, had an extensive career from the 1910s to the 1980s.

Audrey Hepburn: Audrey Hepburn, a British actress, was a renowned film and fashion icon. She holds the third position as a female screen legend in Classical Hollywood cinema, as recognized by the American Film Institute. Hepburn's influential style also earned her a place in the International Best Dressed Hall of Fame List.

Vivien Leigh: Vivien Leigh, also known as Lady Olivier, was a renowned British actress. She achieved great success by winning two Academy Awards for her iconic roles in Gone with the Wind and A Streetcar Named Desire. Additionally, she won a Tony Award for her work in the Broadway musical Tovarich. Despite periods of inactivity, Leigh's talent and presence made her the 16th-greatest female movie star of classic Hollywood cinema, according to the American Film Institute in 1999.

Sophia Loren: Sophia Loren, born Sofia Costanza Brigida Villani Scicolone, is a renowned Italian actress. She is considered one of the greatest stars of classical Hollywood cinema and holds a prominent position on the American Film Institute's list of the 50 greatest stars in American film history. As one of the last surviving major stars from that era, Loren continues to be celebrated for her contributions to the industry.

Jeanne Moreau: Jeanne Moreau was a notable French actress, singer, director, and socialite. She rose to fame in the 1960s with leading roles in influential films such as "Elevator to the Gallows," "La Notte," and "Jules et Jim." Moreau was praised by Orson Welles as "the greatest actress in the world."

Elizabeth Taylor: Elizabeth Taylor, a British and American actress, was a child actress in the 1940s who rose to become one of the most popular stars in classical Hollywood cinema in the 1950s. She later became the highest paid movie star of the 1960s and remained a well-known public figure until her death. Her significant contributions to film were recognized by the American Film Institute, who named her the seventh-greatest female screen legend of Classic Hollywood cinema in 1999.

Ousmane Sembène: Ousmane Sembène, a Senegalese film director, producer, and writer, is known as the "father of African film." He favored being credited as Sembène Ousmane to challenge the colonial naming tradition. The Los Angeles Times recognizes him as one of Africa's greatest authors. Sembène had a deep interest in Serer religious festivals, notably the Tuur festival.

James Cameron: James Cameron is a Canadian filmmaker known for his innovative use of technology and classical filmmaking style. Some of his notable works include The Terminator, Aliens, The Abyss, Terminator 2: Judgment Day, True Lies, Titanic, and Avatar. Cameron has received numerous industry accolades, including Academy Awards, and has had three of his films selected for preservation in the National Film Registry.

Woody Allen: Woody Allen is an American filmmaker, actor, and comedian with a career spanning six decades. He holds the record for the most Academy Award nominations for Best Original Screenplay. Allen has won four Academy Awards, ten BAFTA Awards, two Golden Globe Awards, and a Grammy Award. He has also received honors such as the Golden Lion, BAFTA Fellowship, Honorary Palme d'Or, and the Golden Globe Cecil B. DeMille Award. Two of his films have been included in the National Film Registry.

Frank Capra: Frank Capra was an Italian-American director, producer, and screenwriter known for his award-winning films in the 1930s and 1940s. Raised in Los Angeles, his rags-to-riches story embodies the American Dream.

Francis Ford Coppola: Francis Ford Coppola is a highly acclaimed American film director, producer, and screenwriter, known for his significant contribution to the New Hollywood film movement. He is widely regarded as one of the greatest directors in the history of cinema, having won five Academy Awards, six Golden Globe Awards, two Palmes d'Or, and a British Academy Film Award.

Cecil B. DeMille: Cecil B. DeMille was a significant American filmmaker and actor who produced and directed 70 films between 1914 and 1958. Considered a pioneer of American cinema, he was known for his epic-scale productions and impressive showmanship. DeMille's wide-ranging works covered social dramas, comedies, Westerns, farces, morality plays, and historical pageants, making him the most commercially successful producer-director in film history.

Walt Disney: Walt Disney was a pioneering American animator, film producer, and entrepreneur known for his contributions to the animation industry. He holds the record for the most Academy Awards earned and nominations by an individual, and his films are considered some of the greatest ever by the American Film Institute.

Clint Eastwood: Clint Eastwood - American actor and film director known for his Western roles and iconic character "Man with No Name." He gained global recognition as Harry Callahan in the Dirty Harry films and has become an enduring symbol of masculinity. Eastwood also served as the mayor of Carmel-by-the-Sea, California for two years after being elected in 1986.

John Ford: John Ford, born John Martin Feeney, was a highly influential American film director and producer. He emerged during Hollywood's Golden Age, becoming recognized as an auteur and directing over 140 films spanning five decades. Ford won a record-breaking four Academy Awards for Best Director for films including The Informer, The Grapes of Wrath, How Green Was My Valley, and The Quiet Man.

Miloš Forman: Miloš Forman was a Czech-American film director, screenwriter, and actor. He gained fame in Czechoslovakia before moving to the United States in 1968. Forman received numerous awards during his career, including two Academy Awards, three Golden Globe Awards, and a BAFTA Award.

Samuel Goldwyn: Samuel Goldwyn, a Polish-born American film producer, founded and led multiple Hollywood studios. He received prestigious awards such as the 1973 Golden Globe Cecil B. DeMille Award, the Irving G. Thalberg Memorial Award in 1947, and the Jean Hersholt Humanitarian Award in 1958.

D. W. Griffith: David Wark Griffith, an influential American film director, revolutionized film editing and storytelling, leaving a lasting impact on the motion picture industry.

Howard Hawks: Howard Hawks was an influential American film director, producer, and screenwriter known for his work in the classic Hollywood era. Despite not being widely recognized, he is regarded as one of the greatest American directors. Hawks found success in various genres, showcasing his distinct style in each. He received an Academy Award nomination for Best Director and was honored with a Lifetime Achievement Award in 1974.

Buster Keaton: Buster Keaton, or Joseph Frank Keaton, was an American actor, comedian, and director. He became famous for his silent film performances, featuring physical comedy and a stoic, deadpan expression that earned him the nickname "The Great Stone Face."

Stanley Kubrick: Stanley Kubrick, a renowned American filmmaker and photographer, is widely regarded as one of the greatest filmmakers in history. His films, mostly adaptations of novels or short stories, stand out for their meticulous attention to detail, groundbreaking cinematography, elaborate set designs, and dark humor.

George Lucas: George Lucas is an American filmmaker known for creating Star Wars and Indiana Jones. He founded Lucasfilm and other important companies in the film industry. He is one of the most financially successful filmmakers and has been nominated for Academy Awards. Lucas is considered a pioneer of the modern blockbuster and a significant figure in the New Hollywood movement.

Ida Lupino: Ida Lupino was a British actress, director, writer, and producer, known for her significant contributions to the film industry in the United States. With a career spanning 48 years, she acted in 59 films and directed eight. Lupino was considered the leading female filmmaker during the 1950s Hollywood studio system. She gained American citizenship in 1948 and became the first woman to direct a film noir, The Hitch-Hiker, in 1953. Additionally, Lupino co-wrote and co-produced influential social-message films through her independent production company.

David Lynch: David Lynch is an accomplished American filmmaker, artist, musician, and actor known for his surrealist films. He has received critical acclaim and prestigious awards, including the Golden Lion in 2006 and an Honorary Academy Award in 2019. According to The Guardian, Lynch is widely regarded as the most significant filmmaker of the present time.

Frances Marion: Frances Marion was an acclaimed American screenwriter, director, journalist, and author. Known as one of the most prominent female screenwriters of the 20th century, she wrote over 325 scripts during her career. Marion was the first writer to win two Academy Awards. She started her film journey with Lois Weber and later became known for her work with Mary Pickford.

Louis B. Mayer: Louis B. Mayer, a Canadian-American film producer, co-founded MGM in 1924. As its manager, he transformed it into the most esteemed Hollywood movie studio, attracting the finest writers, directors, and stars.

Martin Scorsese: Martin Scorsese is an American film director, producer, screenwriter, and actor who rose to prominence during the New Hollywood era. He has won multiple prestigious awards, including an Academy Award and Golden Globe Awards. Scorsese has also been recognized with special honors such as the AFI Life Achievement Award and Kennedy Center Honor. Additionally, five of his films have been deemed significant enough to be included in the National Film Registry.

Steven Spielberg: Steven Spielberg is an influential American film director, producer, and screenwriter known for his blockbuster movies. He holds the title of the most commercially successful director in history. Spielberg has won numerous awards, including three Academy Awards and the Presidential Medal of Freedom. Many of his films have been recognized as culturally significant by the Library of Congress.

Quentin Tarantino: Quentin Tarantino: American film director, screenwriter, and actor known for his distinctive style. His films feature stylized violence, extensive dialogue with profanity, and references to popular culture.

Irving Thalberg: Irving Thalberg, known as "The Boy Wonder," was a trailblazing American film producer in the early days of cinema. He gained recognition for his remarkable ability to choose scripts, cast actors, assemble production teams, and create successful films like Grand Hotel, China Seas, and A Night at the Opera. Thalberg's movies not only achieved financial success but also projected an enticing image of American life, filled with energy, democracy, and personal freedom.

Jack L. Warner: Jack L. Warner was a Canadian-American film executive who led and shaped Warner Bros. Studios in Burbank, California. He had an impressive career spanning over 55 years, making him one of the most influential Hollywood studio moguls.

Orson Welles: Orson Welles was a prominent American film director, actor, writer, and producer. He was highly regarded for his groundbreaking contributions to film, radio, and theatre, making him one of the most influential and acclaimed filmmakers in history.

Billy Wilder: Billy Wilder was an Austrian-born filmmaker and screenwriter. He had a successful career in Hollywood for five decades and is recognized as a brilliant and versatile filmmaker of Classic Hollywood cinema. He received multiple prestigious awards, including seven Academy Awards, a BAFTA Award, the Cannes Film Festival's Palme d'Or, and two Golden Globe Awards.

William Wyler: William Wyler was a German-born American film director and producer who had a prolific career spanning over five decades. He received three Academy Awards and holds the record for twelve nominations for Best Director. He was honored with the Irving G. Thalberg Memorial Award, Directors Guild of America Lifetime Achievement Award, and American Film Institute Life Achievement Award.

Guru Dutt: Guru Dutt was a renowned Indian filmmaker known for his work in directing, producing, acting, choreography, and writing. He is considered one of the foremost figures in the history of Indian cinema.

Raj Kapoor: Raj Kapoor, a prominent Indian actor, director, and producer, was a significant figure in Hindi cinema. Known as the "Greatest Showman" and "Charlie Chaplin" of Indian cinema, he is widely regarded as one of the most influential figures in the history of Indian film.

Abbas Kiarostami: Abbas Kiarostami was a highly acclaimed Iranian filmmaker, poet, photographer, and screenwriter. With over forty films to his name, he gained international recognition for directing the Koker trilogy, Close-Up, The Wind Will Carry Us, and Taste of Cherry, which won the Palme d'Or at the Cannes Film Festival. He expanded his horizons by shooting Certified Copy in Italy and Like Someone in Love in Japan. Three of his films were listed among the 100 best foreign films in 2018 by BBC Culture, and Close-Up was ranked among the 50 greatest movies of all time in the 2012 Sight & Sound poll.

Akira Kurosawa: Akira Kurosawa was a highly regarded Japanese filmmaker and painter, known for directing 30 influential films over five decades. His style was bold and dynamic, drawing strong influence from Western cinema while maintaining a distinct approach. Kurosawa was involved in all aspects of film production.

Ang Lee: Ang Lee is a Taiwanese filmmaker known for his emotionally charged films that explore repressed emotions. Educated in Taiwan and the United States, he has received international acclaim and has won two Academy Awards, four BAFTA Awards, and three Golden Globe Awards. In 2003, he was ranked 27th in The Guardian's 40 best directors.

Hayao Miyazaki: Hayao Miyazaki: Japanese animator, filmmaker, and manga artist. Co-founder of Studio Ghibli. Internationally acclaimed as a masterful storyteller and creator of Japanese animated feature films. Widely regarded as one of the most accomplished filmmakers in animation history.

Yasujirō Ozu: Yasujirō Ozu was a Japanese filmmaker known for his films about family and marriage relationships. He started with silent comedies and later explored more serious themes. Notable works include Late Spring (1949), Tokyo Story (1953), and An Autumn Afternoon (1962), which were made in color.

Satyajit Ray: Satyajit Ray, an Indian director, was a multi-talented artist celebrated for his influential work in world cinema. He excelled in various fields such as directing, screenwriting, and composing. Some of his renowned works include The Apu Trilogy, The Music Room, The Big City, and Charulata. He is also known for the Goopy-Bagha trilogy.

Wong Kar-wai: Wong Kar-wai is a renowned Hong Kong director known for his distinctive filmmaking style, featuring non-linear narratives, atmospheric music, and vibrant cinematography with bold colors. As a prominent figure in Hong Kong cinema, he is considered a contemporary auteur and was ranked third on Sight & Sound's list of the greatest filmmakers in the last 25 years. His films are frequently featured in best-of lists worldwide.

Michelangelo Antonioni: Michelangelo Antonioni, an influential Italian director, is renowned for his "trilogy on modernity" and movies like L'Avventura, La Notte, L'Eclisse, and Blowup. His films, characterized by intricate mood and stunning visuals, explore enigmatic plots and modern landscapes. Antonioni's work significantly influenced art cinema, and he received multiple awards, notably being the only director to win the Palme d'Or, Golden Lion, Golden Bear, and Golden Leopard.

Ingmar Bergman: Ingmar Bergman was a highly influential Swedish screenwriter and director, regarded as one of the greatest filmmakers of all time. His films delve into profound psychological and spiritual struggles, making him a master of deeply personal storytelling. Some of his most celebrated works, including The Seventh Seal, Wild Strawberries, Persona, and Fanny and Alexander, were recognized among the greatest films ever made. Bergman also ranked among the top directors in Sight & Sound's prestigious lists.

Robert Bresson: Robert Bresson was a French film director renowned for his minimalist style. He used non-professional actors, minimal music and ellipses to create powerful and tragic stories. Bresson's works are considered prime examples of minimalist film-making.

Luis Buñuel: Luis Buñuel was a Spanish filmmaker renowned for his avant-garde surrealism and political commentary. He worked in France, Mexico, and Spain, and is widely regarded as one of the most influential filmmakers of all time.

Charlie Chaplin: Charlie Chaplin, an English comic actor and filmmaker, achieved worldwide fame during the silent film era. Known for his iconic character, the Tramp, he is considered a significant figure in the film industry. His career spanned 75 years, from the Victorian era until 1977. Chaplin's impact was characterized by both admiration and controversy.

Jean Cocteau: Jean Cocteau was a French artist known for his work in various fields such as poetry, playwriting, filmmaking, and visual arts. He was a key figure in surrealist, avant-garde, and Dadaist movements, and had a significant impact on early 20th century art. His diverse talents and innovative approach led him to be regarded as a Renaissance man of his generation.

Vittorio De Sica: Vittorio De Sica, an acclaimed Italian film director and actor, played a significant role in the neorealist movement.

Carl Theodor Dreyer: Carl Theodor Dreyer, a Danish film director, is celebrated for his emotionally restrained and deliberately paced movies. Frequently exploring themes of societal intolerance, the interconnectedness of fate and death, and the presence of evil in daily existence, Dreyer is widely regarded as one of cinema's finest directors.

Sergei Eisenstein: Sergei Eisenstein was a groundbreaking Soviet film director, screenwriter, editor, and theorist known for his mastery of montage. His notable works include the silent films Strike, Battleship Potemkin, and October, as well as historical epics like Alexander Nevsky and Ivan the Terrible. In Sight & Sound's 2012 poll, Battleship Potemkin was ranked as the 11th-greatest film of all time.

Federico Fellini: Federico Fellini, the renowned Italian filmmaker, was celebrated for his unique blend of fantasy and baroque imagery with a touch of realism. Regarded as one of the most notable and influential filmmakers in history, his films, including the masterpiece "8+1⁄2", consistently feature among the greatest ever made, according to prestigious polls like Cahiers du Cinéma and Sight & Sound.

Jean-Luc Godard: Jean-Luc Godard, a Franco-Swiss film director and critic, was a pioneering figure in the French New Wave movement of the 1960s. Considered the most influential French filmmaker of the post-war era, his work revolutionized the motion picture form through experimentation with narrative, sound, continuity, and camerawork. Some of his best-known films include Breathless (1960), Contempt (1963), Alphaville (1965), and Goodbye to Language (2014).

Werner Herzog: Werner Herzog, a notable German filmmaker, actor, opera director, and author, is regarded as a pioneer of New German Cinema. His films anchor on protagonists with audacious dreams, peculiar talents, or challenging encounters with nature. Herzog's distinctive style involves eschewing storyboards, prioritizing improvisation, and immersing his team in real-life scenarios that parallel the film's narrative.

Alfred Hitchcock: Alfred Hitchcock was an influential English film director known for his suspenseful movies. He directed over 50 films in a career spanning six decades, and his work is still widely watched and studied today. Hitchcock also became famous for his interviews, cameo roles in his own films, and hosting a television anthology series. Although he never won a Best Director Oscar, his films earned 46 Academy Award nominations with six wins.

Elia Kazan: Elia Kazan, born Elias Kazantzoglou, was a celebrated American film and theatre director, producer, screenwriter, and actor. He is widely regarded as one of the most honored and influential directors in the history of Broadway and Hollywood.

Fritz Lang: Fritz Lang was an influential Austrian film director known for his expressionist style. He was hailed as the "Master of Darkness" and worked in Germany before moving to the United States. His impact on film has made him one of the most influential directors in history.

David Lean: David Lean was a renowned English film director, producer, screenwriter, and editor, who is considered one of the most significant figures in British cinema. His notable works include epic films like The Bridge on the River Kwai, Lawrence of Arabia, Doctor Zhivago, Ryan's Daughter, and A Passage to India. He also directed film adaptations of Charles Dickens novels, Great Expectations and Oliver Twist, as well as the romantic drama Brief Encounter.

Auguste and Louis Lumière: Auguste and Louis Lumière were French manufacturers of photography equipment. They developed the Cinématographe motion picture system and produced short films between 1895 and 1905, making them among the earliest filmmakers.

Georges Méliès: Georges Méliès, a French magician and film pioneer, revolutionized early cinema through his technical and narrative innovations. He was not only an actor but also a talented film director who played a major role in shaping the development of the medium.

Roman Polanski: Roman Polanski is a renowned French and Polish filmmaker who has achieved significant success in his career. He has received several prestigious awards, including an Academy Award, two Golden Globe Awards, and ten César Awards. Polanski's remarkable talent has earned him recognition as both a director and an actor.

Jean Renoir: Jean Renoir was a French film director, screenwriter, actor, producer, and author, known for making over forty films from the silent era to the late 1960s. His films "La Grande Illusion" and "The Rules of the Game" are considered some of the greatest movies ever made, and he was ranked as the fourth greatest director of all time by critics. He received a Lifetime Achievement Academy Award in 1975 for his contributions to the film industry. Renoir was the son of renowned painter Pierre-Auguste Renoir and is recognized as one of the first filmmakers called an auteur.

Leni Riefenstahl: Leni Riefenstahl was a German filmmaker, photographer, and actress best recognized for her role in producing Nazi propaganda during World War II.

Andrei Tarkovsky: Andrei Tarkovsky, a Russian film director and screenwriter, is regarded as one of the most important directors in cinema history. His films delve into spiritual and metaphysical subjects, featuring slow pacing, dreamlike visuals, and a strong emphasis on nature and memory.

François Truffaut: François Truffaut was a prominent French filmmaker, actor, and critic, and a pioneer of the French New Wave movement. His influential career spanned over 25 years, making him an iconic figure in the French film industry.

Agnès Varda: Agnès Varda, a respected Belgian-born filmmaker and artist, held French and Greek heritage. Her notable works encompass directing, screenwriting, photography, and various artistic endeavors.

David Attenborough: David Attenborough is a British broadcaster and naturalist, known for his work with the BBC Natural History Unit. He has written and presented the renowned Life collection, which explores the diverse animal and plant life on Earth.

Jim Henson: Jim Henson was an American puppeteer and filmmaker. He is famous for creating the Muppets, as well as directing notable films such as The Dark Crystal and Labyrinth. He also created Fraggle Rock.

George Balanchine: George Balanchine, a Russian-Georgian choreographer, was a highly influential figure in 20th-century ballet. Co-founding the New York City Ballet, he served as its artistic director for over 35 years. His distinctive style includes plotless ballets with minimal costumes and décor, performed to classical and neoclassical music. He is often referred to as the father of American ballet.

Mikhail Baryshnikov: Mikhail Baryshnikov is a renowned Latvian and American dancer, choreographer, and actor. He dominated the world of male classical dance in the 1970s and 1980s. Later, he established himself as a prominent dance director.

Margot Fonteyn: Margot Fonteyn, an English ballerina, is renowned for her career with the Royal Ballet. She was appointed prima ballerina assoluta by Queen Elizabeth II. Fonteyn started ballet at four, training in England and China. Her interest in Russian ballet emerged from studying with Georgy Goncharov in Shanghai. Joining Vic-Wells Ballet School, she became prima ballerina in 1935, collaborating with choreographer Sir Frederick Ashton and partner Robert Helpmann.

Vaslav Nijinsky: Vaslav Nijinsky, a Russian ballet dancer and choreographer, was revered as the greatest male dancer of the early 20th century. Known for his virtuosity, he captivated audiences with his intense characterizations and extraordinary gravity-defying leaps. Nijinsky's exceptional skill also included the rare ability to dance en pointe, setting him apart from other male dancers of his time.

Rudolf Nureyev: Rudolf Nureyev, a celebrated Soviet-born ballet dancer and choreographer, is considered one of the greatest male ballet dancers of his time.

Anna Pavlova: Anna Pavlova was a Russian ballerina known for her roles in the Imperial Russian Ballet and the Ballets Russes. She is famous for creating the role of The Dying Swan and was the first ballerina to tour globally with her own company, performing in various countries including South America, India, Mexico, and Australia.

Marius Petipa: Marius Petipa, a French and Russian ballet dancer, choreographer, and teacher, holds immense influence in ballet history. He is renowned as one of the most influential ballet masters and choreographers.

Fred Astaire: Fred Astaire was an American dancer, actor, singer, and choreographer who is considered the greatest popular-music dancer ever. He received numerous prestigious awards, including an Honorary Academy Award, three Primetime Emmy Awards, a BAFTA Award, two Golden Globe Awards, and a Grammy Award. His talents were recognized by the Film Society of Lincoln Center, the Kennedy Center Honors, and the AFI Life Achievement Award. Astaire also earned a star on the Hollywood Walk of Fame and was inducted into the American Theatre Hall of Fame and the Television Hall of Fame.

Josephine Baker: Josephine Baker was an influential American-born French dancer, singer, and actress. Her career blossomed in France, where she became the first black woman to star in a major motion picture, the 1927 film Siren of the Tropics.

Isadora Duncan: Isadora Duncan was an American dancer and choreographer known for revolutionizing contemporary dance. She gained fame performing in Europe and the US, and had a tragic death in France when her scarf got caught in a car wheel.

Bob Fosse: Bob Fosse was a multifaceted American artist known for his work as an actor, choreographer, dancer, and director. He is famous for directing and choreographing iconic stage and screen musicals like The Pajama Game, Damn Yankees, How to Succeed in Business Without Really Trying, Sweet Charity, Pippin, and Chicago. In addition, Fosse directed several notable films, including Sweet Charity, Cabaret, Lenny, All That Jazz, and Star 80.

Martha Graham: Martha Graham, an influential American dancer and choreographer, revolutionized American dance with her innovative Graham technique. Her style redefined the art form and continues to be taught globally.

Gene Kelly: Gene Kelly was an American dancer, actor, singer, director, and choreographer renowned for his energetic and athletic dancing style. He aimed to popularize "dance for the common man" and played a significant role in creating a new form of American dance accessible to the general public. Kelly collaborated with Stanley Donen to create highly acclaimed musical films during the 1940s and 1950s, where he starred, choreographed, and co-directed.

Izumo no Okuni: Izumo no Okuni, a Japanese entertainer and shrine maiden, is known as the inventor of kabuki, a theatrical art form. She started performing kabuki in Kyoto's Kamo River riverbed, gaining immense popularity. Her all-female theatre group, which included lower-class women, became renowned for their talented performers.

Ginger Rogers: Ginger Rogers, an American actress, dancer, and singer, was a prominent figure during the Golden Age of Hollywood. She achieved recognition through her performances in RKO's musical films alongside Fred Astaire. Rogers won an Academy Award for Best Actress for her role in Kitty Foyle (1940), and her career spanned the 20th century, encompassing stage, radio, and television.

George Carlin: George Carlin was a highly influential American comedian, actor, author, and social critic. He was regarded as one of the greatest stand-up comedians, known for his black comedy and thought-provoking reflections on politics, language, psychology, religion, and taboo subjects. Carlin was often referred to as "the dean of counterculture comedians."

Louis de Funès: Louis de Funès, a beloved French actor and comedian, is renowned for his dynamic performances, exceptional facial expressions, and entertaining tics. With over 150 film roles and 100 stage appearances, he has become France's most adored actor. Notably, many of his most famous acts were directed by Jean Girault.

Laurel and Hardy: Laurel and Hardy were a famous British-American comedy duo in the early Hollywood era. Consisting of Stan Laurel and Oliver Hardy, they started in silent films and successfully transitioned to "talkies". Known for slapstick comedy, Laurel played a clumsy friend to Hardy's pompous bully. Their signature theme song, "The Cuckoo Song" was emblematic of their films.

Marx Brothers: The Marx Brothers were a popular American comedy act in vaudeville, Broadway, and movies from 1905-1949. They made 14 films, with two, Duck Soup and A Night at the Opera, considered among the top comedies. Critically acclaimed, they are widely regarded as influential comedians of the 20th century, and were recognized by AFI in their list of greatest male stars in Classical Hollywood cinema.

Richard Pryor: Richard Pryor was an influential American stand-up comedian and actor. He captivated audiences with his sharp observations and storytelling, earning him recognition as one of the greatest comedians ever. Pryor received numerous awards, including a Primetime Emmy and five Grammy Awards. He was honored with the first Kennedy Center Mark Twain Prize for American Humor and ranked first on Comedy Central's and Rolling Stone's lists of all-time best stand-up comedians.

Lucille Ball: Lucille Ball, an American actress and comedienne, achieved great success in her career. She was nominated for 13 Primetime Emmy Awards, winning five times, and received numerous accolades such as the Golden Globe Cecil B. DeMille Award. Ball was honored with two stars on the Hollywood Walk of Fame and earned other prestigious recognitions including the Women in Film Crystal Award and induction into the Television Hall of Fame. Her contributions were further acknowledged with a Kennedy Center Honor and the Governors Award from the Academy of Television Arts & Sciences.

Carol Burnett: Carol Burnett is a groundbreaking American comedian, actress, and singer. She hosted one of the first comedy-variety shows on CBS, breaking barriers for women. Burnett has excelled in various entertainment mediums, receiving multiple prestigious awards including Emmys, a Tony, a Grammy, and Golden Globes. She has also been honored with the Presidential Medal of Freedom, the Mark Twain Prize, and the Screen Actors Guild Life Achievement Award.

Bill Cosby: Bill Cosby is an American former comedian and actor known for his portrayal of Cliff Huxtable on The Cosby Show. He has contributed to American and African American culture, earning the nickname "America's Dad." However, his career was tainted by sexual assault allegations in 2014, leading to the revocation of many awards and honorary degrees he received.

Monty Python: Monty Python was a British comedy troupe formed in 1969. They gained fame for their sketch comedy series, Monty Python's Flying Circus, which aired from 1969 to 1974 on the BBC. The group consisted of Graham Chapman, John Cleese, Terry Gilliam, Eric Idle, Terry Jones, and Michael Palin. Their influence on comedy has been likened to the Beatles' impact on music. Monty Python's work encompassed live shows, films, albums, books, and musicals, making them an important force in the evolution of television comedy.

Johnny Carson: Johnny Carson, an American television host and comedian, achieved fame as the host of The Tonight Show Starring Johnny Carson from 1962 to 1992. He won numerous awards, including six Primetime Emmy Awards and a Peabody Award. In recognition of his contributions to television, he was inducted into the Television Academy Hall of Fame. Carson also received the Presidential Medal of Freedom in 1992 and a Kennedy Center Honor in 1993.

Ed Sullivan: Ed Sullivan, an American television host, created and hosted The Ed Sullivan Show, a long-running variety program from 1948 to 1971. It is considered the last great American TV show and holds the record for being the longest-running variety show in U.S. broadcast history. Sullivan was also a sports and entertainment reporter and syndicated columnist.

Oprah Winfrey: Oprah Winfrey, also known as Oprah, is an American media mogul and influential figure. She gained fame as the host of the popular talk show, The Oprah Winfrey Show, which aired for 25 years. Oprah is known as the "Queen of All Media" and was the richest African-American of the 20th century. She has been ranked as one of the most influential women in the world.

P. T. Barnum: P. T. Barnum was an influential American showman, businessman, and politician known for his promotion of famous deceptions. He co-founded the Barnum & Bailey Circus alongside James Anthony Bailey.

Harry Houdini: Harry Houdini, born Erik Weisz, was a Hungarian-American escape artist, illusionist, and stunt performer. He gained fame for his incredible escape acts and was inspired by French magician Robert-Houdin.

Marcel Marceau: Marcel Marceau was a renowned French mime artist and actor known for his iconic stage character, "Bip the Clown." He dedicated his career to the art of silence, showcasing his exceptional talent globally for over six decades.

Brigitte Bardot: Brigitte Bardot, also known as B.B., is a French animal rights activist and former actress, singer, and model. She gained fame for her sexually liberated roles and was a prominent figure in the sexual revolution of the 1950s–1970s. Although she left the entertainment industry in 1973, Bardot remains an influential popular culture icon. She starred in 47 films, performed in musicals, and recorded over 60 songs. In recognition of her contributions, she was honored with the Legion of Honour in 1985.

Aristotle: Aristotle, an ancient Greek philosopher and polymath, covered various subjects including natural sciences, philosophy, linguistics, economics, politics, psychology, and the arts. He founded the Peripatetic school of philosophy in Athens, which paved the way for the development of modern science.

Augustine of Hippo: Augustine of Hippo, also known as Saint Augustine, was a Berber theologian and philosopher who served as the bishop of Hippo Regius in Roman North Africa. His writings greatly influenced Western philosophy and Christianity, making him a prominent Church Father of the Latin Church during the Patristic Period. His notable works include The City of God, On Christian Doctrine, and Confessions.

Cicero: Cicero was a prominent Roman statesman, scholar, and writer who advocated for traditional Roman values during a time of political turmoil. He is revered for his eloquence as an orator and for his influential writings on rhetoric, philosophy, and politics. Educated in both Rome and Greece, Cicero came from a wealthy family and served as consul in 63 BC.

Confucius: Confucius, a Chinese philosopher during the Spring and Autumn period, is revered as the epitome of wisdom in Chinese culture. His teachings, known as Confucianism, continue to shape East Asian society by emphasizing morality, social relationships, justice, kindness, sincerity, and a ruler's responsibility to their subjects.

Democritus: Democritus, an Ancient Greek philosopher, is known for his atomic theory of the universe. Unfortunately, none of his work has been preserved.

Diogenes: Diogenes, a Greek philosopher born in Sinope in 412 or 404 BC, was one of the founders of Cynicism. He died in Corinth in 323 BC.

Epicurus: Epicurus was an ancient Greek philosopher who founded the influential school of Epicureanism. He established his own school called "the Garden" in Athens, where he and his followers enjoyed simple meals and discussed a wide range of philosophical subjects. He had a policy of allowing women and slaves to join the school. While most of his works have been destroyed, three letters and two collections of quotes have survived, providing insights into his philosophy. Later authors like Diogenes Laërtius, Lucretius, Philodemus, Sextus Empiricus, and Cicero have contributed to our understanding of his teachings.

Han Fei: Han Fei, also called Han Feizi, was a respected philosopher and statesman from ancient China. He belonged to the Legalist school during a time of war and was also a prince in the state of Han.

Heraclitus: Heraclitus was a pre-Socratic philosopher from Ephesus in ancient Greece, which was under the rule of the Persian Empire.

Kaṇāda (philosopher): Kaṇāda was an ancient Indian philosopher who founded the Vaisheshika school of Indian philosophy. He is considered to be an early natural scientist and is known for his contributions to Indian physics.

Laozi: Laozi, also known as Lao Tzu, was a legendary Chinese philosopher and the author of the Tao Te Ching, a significant text in Taoism. He is often referred to as "the Old Master." While his biographical details are considered to be invented, he was said to be born in the state of Chu during the 6th century BC and served as the royal archivist for the Zhou court. Laozi is believed to have crossed paths with Confucius and composed the Tao Te Ching before withdrawing from societal life.

Li Si: Li Si, a Chinese calligrapher, philosopher, and politician, was a prominent figure during the Qin dynasty. He served as Chancellor under Qin Shi Huang, the First Emperor, and later under Qin Er Shi, the Second Emperor. Li Si admired the administrative techniques of Shen Buhai and Han Fei, but primarily followed the legal principles of Shang Yang.

Lucretius: Lucretius was a Roman poet and philosopher known for his work, De rerum natura, a poem explaining Epicurean philosophy. Very little is known about his life. The poem was dedicated to his friend or client, Gaius Memmius. De rerum natura greatly influenced Virgil and Horace. The poem was almost lost but rediscovered in 1417. It contributed to the development of atomism and influenced thinkers during the Enlightenment era.

Mencius: Mencius, also known as Mengzi, was a Chinese Confucian philosopher considered as the "second Sage" after Confucius himself. He expanded on Confucius' teachings and travelled extensively during the Warring States period, advising rulers. The conversations he had with these rulers became the Mencius, an important Confucian classic.

Plato: Plato, an influential Greek philosopher, was born in Athens during the Classical period.

Plotinus: Plotinus was a Greek philosopher considered the founder of Neoplatonism. He was born in Roman Egypt and influenced by his self-taught teacher Ammonius Saccas. The term "neoplatonism" was coined in the 19th century to describe Plotinus' philosophy, which had a significant impact during various historical periods. Porphyry's preface to Plotinus' major work, The Enneads, provides much of the biographical information about him. Plotinus's metaphysical writings centered around three principles: the One, the Intellect, and the Soul. His works influenced pagan, Jewish, Christian, Gnostic, and early Islamic thinkers, contributing to mainstream theological concepts. Notably, he explored the duality of the One in two metaphysical states.

Seneca the Younger: Seneca the Younger was a prominent Stoic philosopher, statesman, and writer in Ancient Rome. He was known for his influential works in various genres including drama and satire, contributing significantly to the post-Augustan period of Latin literature.

Shang Yang: Shang Yang, also known as Wei Yang, was an influential Chinese philosopher, statesman, and reformer during the Warring States period. He served in the State of Qin and implemented policies that strengthened the state economically and politically. His administrative reforms contributed to the unification of China under the Qin dynasty. Shang Yang's ideas also influenced The Book of Lord Shang, a significant work in Chinese legalism.

Socrates: Socrates, an influential Greek philosopher, is considered the founder of Western philosophy and moral thought. Though he left no writings, his ideas were preserved through dialogues by his students, such as Plato and Xenophon. These dialogues gave rise to the Socratic dialogue literary genre. Due to contradictory accounts, his philosophy remains a subject of debate, known as the Socratic problem. Socrates was a controversial figure in Athens and was ultimately sentenced to death in 399 BC after being accused of impiety and corrupting the youth.

Thales of Miletus: Thales of Miletus was a pre-Socratic philosopher from Ancient Greece, known as one of the Seven Sages. He came from Miletus in Ionia, Asia Minor. Thales is famous for his saying "know thyself", inscribed on the Temple of Apollo at Delphi.

Xunzi (philosopher): Xunzi, a Chinese philosopher of Confucianism, synthesized Daoist and Mohist ideas with earlier Confucian thought during the late Warring States period. His revision of Confucianism was crucial for its later success. His works are preserved in the book "Xunzi", arranged by Liu Xiang after Xunzi's death.

Peter Abelard: Peter Abelard, a prominent figure in medieval France, was a scholastic philosopher known for his expertise in logic and theology. He was also a talented poet, composer, and musician.

Averroes: Averroes, also known as Ibn Rushd, was a versatile Andalusian scholar and jurist who explored a wide range of subjects, such as philosophy, theology, medicine, astronomy, physics, psychology, mathematics, Islamic law, and linguistics. He authored over 100 books, including influential commentaries on Aristotle, earning him the titles "The Commentator" and "Father of Rationalism" in the Western world.

Duns Scotus: Duns Scotus: A Scottish Catholic priest and philosopher who lived in the High Middle Ages. He was a prominent theologian and university professor, known for his contributions to Christian philosophy. Alongside famous figures such as Thomas Aquinas, Bonaventure, and William of Ockham, he is considered one of the most important philosopher-theologians in Western Europe.

Al-Farabi: Al-Farabi, also known as Alpharabius in the Latin West, was an influential Islamic philosopher, music theorist, and considered the "Father of Islamic Neoplatonism." He is renowned as the "Founder of Islamic Political Philosophy."

Thomas Aquinas: Thomas Aquinas was an influential Italian Dominican friar, philosopher, theologian, and jurist, known for his contributions to scholasticism.

Wang Yangming: Wang Yangming, a prominent figure during the Ming Dynasty, was a versatile Chinese calligrapher, general, philosopher, politician, and writer. Considered one of the most influential Neo-Confucian thinkers after Zhu Xi, he challenged traditional dualistic interpretations, emphasizing the unity of knowledge and action. Wang, along with Lu Xiangshan, established the Lu-Wang school, also known as the School of the Mind.

William of Ockham: William of Ockham, an influential English Franciscan friar, theologian, and philosopher, was born in Ockham, Surrey. He played a crucial role in medieval thought and was involved in significant intellectual and political disputes of the 14th century. Known for Occam's razor, his principle of simplicity, he made significant contributions to logic, physics, and theology. The Church of England commemorates him on April 10th.

Zhu Xi: Zhu Xi, also known as Chu Hsi, was a influential Chinese figure in the Song dynasty. He was a calligrapher, historian, philosopher, poet, and politician. With his contributions to Neo-Confucianism, he greatly shaped Chinese philosophy and worldview. Zhu's notable works include his editing and commentaries on the Four Books, his exploration of the "investigation of things," and his advancement of meditation as a means of self-cultivation.

Francis Bacon: Francis Bacon, 1st Viscount St Alban, was an English philosopher and statesman. He served as Attorney General and Lord Chancellor of England under King James I. Bacon played a crucial role in advancing natural philosophy and the scientific method. His works continued to have a significant impact during the Scientific Revolution.

Jeremy Bentham: Jeremy Bentham, the English philosopher, jurist, and social reformer, is credited with founding modern utilitarianism.

George Berkeley: George Berkeley, also known as Bishop Berkeley, was an Anglo-Irish philosopher who developed the theory of "immaterialism." This theory denies the existence of material substance and asserts that objects like tables and chairs only exist as ideas perceived by the mind. Berkeley is also notable for his critique of abstraction, which supports his argument for immaterialism.

Giordano Bruno: Giordano Bruno was an Italian philosopher and poet known for his cosmological theories, including the idea of distant suns with their own exoplanets. He believed in cosmic pluralism and insisted on an infinite universe with no center.

René Descartes: René Descartes was a French philosopher, scientist, and mathematician who played a crucial role in the development of modern philosophy and science. He pioneered the integration of geometry and algebra, forming analytic geometry. Descartes spent most of his career in the Dutch Republic, becoming a prominent figure in the Dutch Golden Age. Despite being associated with a Protestant state and criticized as a deist, Descartes remained a Roman Catholic.

Denis Diderot: Denis Diderot, a French philosopher and writer, is renowned for co-founding and editing the Encyclopédie. As a key figure in the Age of Enlightenment, he made significant contributions to the fields of art criticism and philosophy.

Erasmus: Erasmus was a Dutch Christian humanist, theologian, educator, satirist, and philosopher. He was known for his translations, books, essays, prayers, and letters. He is considered a highly influential thinker of the Northern Renaissance and a major figure in Dutch and Western culture.

Johann Gottlieb Fichte: Johann Gottlieb Fichte was a German philosopher, known as a founding figure of German idealism. He made original contributions to the understanding of self-consciousness and is wrongly associated with the thesis–antithesis–synthesis concept, which actually originated with Hegel. Fichte's works also explored political philosophy and he is considered one of the fathers of German nationalism.

David Hume: David Hume was a Scottish philosopher and historian who championed philosophical empiricism, skepticism, and naturalism during the Scottish Enlightenment. His most influential work, A Treatise of Human Nature, explored the psychological aspects of human nature and rejected the concept of innate ideas, asserting that all knowledge stems from experience. Hume's beliefs align him with empiricist thinkers like Francis Bacon, Thomas Hobbes, John Locke, and George Berkeley.

Immanuel Kant: Immanuel Kant was a German philosopher and a key figure of the Enlightenment. His comprehensive works in epistemology, metaphysics, ethics, and aesthetics have earned him the titles of the "father of modern ethics," "father of modern aesthetics," and "father of modern philosophy."

Jean-Jacques Rousseau: Jean-Jacques Rousseau, a philosopher, writer, and composer from Geneva, had a significant impact on the Age of Enlightenment, the French Revolution, and modern political, economic, and educational thought.

Baruch Spinoza: Baruch Spinoza, also known as Benedictus de Spinoza, was a prominent Portuguese-Jewish philosopher of the seventeenth century. Expelled from the Jewish community, he lived a modest life centered around philosophy in the Dutch Republic. His writings were circulated among a devoted group of supporters who formed a philosophical sect.

John Dewey: John Dewey, an influential American philosopher, psychologist, and educational reformer, was a leading scholar in the early 1900s.

Ralph Waldo Emerson: Ralph Waldo Emerson, an American essayist, lecturer, philosopher, abolitionist, and poet, led the transcendentalist movement in the mid-19th century. He championed individualism, critical thinking, and criticized societal pressures and conformity. Friedrich Nietzsche called him the most gifted American, and Walt Whitman regarded him as his master.

Frantz Fanon: Frantz Fanon, a prominent Afro-Caribbean psychiatrist and political philosopher from Martinique, made significant contributions to post-colonial studies, critical theory, and Marxism. His work explored the psychological effects of colonization and the societal consequences of decolonization. Fanon was not only an intellectual but also a political radical, Pan-Africanist, and Marxist humanist.

William James: William James was an influential American philosopher and psychologist. He was the first to teach a psychology course in the United States, earning him the title "Father of American psychology." James is widely recognized as one of the leading thinkers of the late 19th century and is considered one of the most influential philosophers in American history.

Marshall McLuhan: Marshall McLuhan was a Canadian philosopher known as the "father of media studies". He studied at the University of Manitoba and the University of Cambridge before becoming a professor of English. He later moved to the University of Toronto, where he spent his entire career. McLuhan's work is a cornerstone of media theory and he is widely recognized for his significant contributions to the field.

Charles Sanders Peirce: Charles Sanders Peirce, known as "the father of pragmatism," was a renowned American scientist, mathematician, logician, and philosopher. Considered the most original and versatile philosopher in America, he was also hailed as the greatest American thinker ever by Bertrand Russell.

John Rawls: John Rawls, an influential American philosopher, specialized in moral, legal, and political ideologies. His liberal views positioned him as a key figure of the 20th century.

Henry David Thoreau: Henry David Thoreau was an influential American naturalist, essayist, poet, and philosopher. He was a leading figure in the transcendentalist movement and is renowned for his book Walden, which explores the concept of living simply in harmony with nature. Thoreau also authored the essay "Civil Disobedience," advocating for peaceful resistance against an unjust government.

Hannah Arendt: Hannah Arendt, an American historian and philosopher, was a highly influential political theorist in the 20th century.

Simone de Beauvoir: Simone de Beauvoir was a French philosopher, writer, social theorist, and feminist activist. Her significant influence on feminist existentialism and theory is recognized, despite not considering herself or being considered a philosopher during her lifetime.

Henri Bergson: Henri Bergson was a notable French philosopher known for his influential ideas in analytic and continental philosophy during the first half of the 20th century. His work emphasized the importance of immediate experience and intuition over abstract rationalism and science in understanding reality.

Isaiah Berlin: Isaiah Berlin was a notable Russian-British social and political theorist, philosopher, and historian of ideas. He occasionally gave improvised lectures that were later transcribed into published essays and books. Henry Hardy, his primary editor from 1974, played a crucial role in bringing his spoken words into print.

Auguste Comte: Auguste Comte, a French philosopher, mathematician, and writer, is known as the first modern philosopher of science. He formulated the doctrine of positivism and played a crucial role in the development of sociology, even coining the term itself.

Jacques Derrida: Jacques Derrida was a French philosopher born in Algeria. He invented the philosophy of deconstruction, drawing inspiration from linguistics and phenomenology. Derrida is a significant figure in post-structuralism and postmodern philosophy, although he distanced himself from post-structuralism and rejected the term "postmodernity."

Michel Foucault: Michel Foucault was a French philosopher, writer, and political activist known for his theories on power and knowledge. He explored how these concepts are used to control society through various institutions. Foucault's ideas have influenced academics in fields such as communication studies, anthropology, psychology, sociology, criminology, cultural studies, literary theory, feminism, Marxism, and critical theory. He defied labels like structuralist and postmodernist.

Jürgen Habermas: Jürgen Habermas is a prominent German philosopher and social theorist known for his critical theory and pragmatism. He explores the concepts of communicative rationality and the public sphere in his extensive body of work.

Georg Wilhelm Friedrich Hegel: Georg Wilhelm Friedrich Hegel, a prominent German philosopher, greatly influenced German idealism and 19th-century philosophy. His impact covered a wide spectrum of philosophical subjects, including metaphysics, politics, history, art, religion, and the history of philosophy.

Martin Heidegger: Martin Heidegger, a renowned German philosopher, made significant contributions to phenomenology, hermeneutics, and existentialism. Widely regarded as one of the most influential philosophers of the 20th century.

Edmund Husserl: Edmund Husserl was an influential Austrian-German philosopher and mathematician who founded phenomenology, a renowned philosophical school.

Søren Kierkegaard: Søren Kierkegaard was a Danish theologian and philosopher, known as the first existentialist. He critiqued organized religion, emphasizing personal choice and commitment. Kierkegaard's work encompassed topics such as morality, psychology, and the philosophy of religion, often using metaphor and irony. He opposed the quick understanding of intellectuals like Swedenborg, Hegel, and Hans Christian Andersen by literary critics.

John Stuart Mill: John Stuart Mill, an influential English philosopher and political economist, advocated for individual liberty and opposed excessive state control. He made significant contributions to social theory, political theory, and political economy.

Friedrich Nietzsche: Friedrich Nietzsche was a German philosopher known for his influential works. He began as a classical philologist but later turned to philosophy. Despite health issues, he held a prestigious academic position at a young age and wrote extensively over the next decade. At the age of 44, he suffered a mental collapse and lived under the care of family members until his passing in 1900, after battling pneumonia and strokes.

Karl Popper: Karl Popper was a renowned philosopher who rejected classical views of scientific method and emphasized empirical falsification. He argued that theories in science cannot be proven but can be scrutinized through decisive experiments. Popper also opposed the classical account of knowledge and developed critical rationalism, a philosophy rooted in criticism.

Bertrand Russell: Bertrand Russell, a British mathematician, philosopher, and public intellectual, greatly influenced mathematics, logic, set theory, and analytic philosophy.

Jean-Paul Sartre: Jean-Paul Sartre, a prominent French philosopher and writer, was a key figure in 20th-century French philosophy and Marxism. He played a significant role in developing the philosophy of existentialism and his influence extends to sociology, critical theory, post-colonial theory, and literary studies. Despite his refusal, Sartre was awarded the 1964 Nobel Prize in Literature, as he believed writers should not become institutions.

Arthur Schopenhauer: Arthur Schopenhauer was a German philosopher, known for his work 'The World as Will and Representation.' He viewed the world as a manifestation of a blind and irrational will. Influenced by Kant, Schopenhauer developed an atheistic metaphysical and ethical system, rejecting the contemporary German idealist ideas.

Alfred North Whitehead: Alfred North Whitehead was a notable English mathematician and philosopher who developed process philosophy. His revolutionary ideas have influenced various fields such as ecology, theology, education, physics, biology, economics, and psychology.

Ludwig Wittgenstein: Ludwig Wittgenstein, an Austrian philosopher, focused on logic, mathematics, mind, and language in his work.

Eusebius: Eusebius of Caesarea, a Greek Palestinian historian and bishop, was a prominent figure in late antiquity. He was known for his extensive knowledge of Christianity and the biblical canon. Eusebius authored significant works including Demonstrations of the Gospel, Preparations for the Gospel, and On Discrepancies between the Gospels, which delved into the study of the biblical text. He gained the title "Father of Church History" for his major work, the Ecclesiastical History, and also wrote biographies on Constantine the Great, the first Christian Roman Emperor.

Herodotus: Herodotus, a Greek historian and geographer, wrote the Histories, a detailed account of the Greco-Persian Wars. He conducted systematic investigations and is recognized as "The Father of History" by Cicero.

Josephus: Josephus was a Roman-Jewish historian and military leader. He wrote The Jewish War and was born in Jerusalem, part of the Roman province of Judea. His father was of priestly descent and his mother claimed royal ancestry.

Plutarch: Plutarch, a Greek philosopher, historian, biographer, essayist, and priest at the Temple of Apollo in Delphi, is known for his Parallel Lives, a collection of biographies of noteworthy Greeks and Romans, and Moralia, a compilation of essays and speeches. He may have become a Roman citizen and took on the name Lucius Mestrius Plutarchus.

Sima Qian: Sima Qian, a historian of early Han dynasty, is known as the father of Chinese historiography. His work, Records of the Grand Historian, covers a comprehensive history of China for over two millennia. It starts from the legendary Yellow Emperor to Emperor Wu of Han. This first universal history became a model for official histories in Chinese dynasties and cultural sphere until the 20th century.

Tacitus: Publius Cornelius Tacitus, or simply Tacitus, was a prominent Roman politician and historian. Modern scholars consider him one of the greatest Roman historians.

Thucydides: Thucydides was an Athenian historian and general known for his historical account of the Peloponnesian War. His work is considered the foundation of "scientific history," as he emphasized impartiality, evidence-gathering, and analysis of cause and effect. Thucydides' writings provide a detailed and unbiased perspective on the war between Sparta and Athens until the year 411 BC, without attributing events to divine intervention.

Xenophon: Xenophon of Athens, a Greek military leader, philosopher, and historian, commanded the Ten Thousand, a large Greek army, and nearly captured Babylon in 401 BC. He is considered a genius by military historian Theodore Ayrault Dodge and is known for establishing logistical operations and describing strategic flanking maneuvers and feints in combat.

Bede: Bede, also known as Saint Bede or The Venerable Bede, was a highly respected English monk, author, and scholar during the Early Middle Ages. His renowned work, Ecclesiastical History of the English People, earned him the title "The Father of English History". Bede served at the monasteries of St. Peter and St. Paul in the Kingdom of Northumbria, leaving a lasting impact on the field of education and literature.

Jean Froissart: Jean Froissart was a medieval author and court historian known for his Chronicles, which are considered the primary portrayal of the chivalric revival in 14th-century England, France, and Scotland. He also wrote an Arthurian romance called Meliador and a significant amount of poetry. His work is a valuable source for understanding the early period of the Hundred Years' War.

Geoffrey of Monmouth: Geoffrey of Monmouth, a Catholic cleric from Monmouth, Wales, played a significant role in British historiography and popularizing King Arthur stories. His renowned work, The History of the Kings of Britain, was highly influential and translated into various languages. However, it is now regarded as historically unreliable, despite receiving credibility until the 16th century.

Ibn Khaldun: Ibn Khaldun, an influential Arab scholar, is highly regarded as a leading social scientist of the Middle Ages. Often referred to as the father of historiography, sociology, economics, and demography studies, his work holds significant importance in those fields.

Edward Gibbon: Edward Gibbon was a multi-talented English essayist, historian, and politician known for his notable work, The History of the Decline and Fall of the Roman Empire. This six-volume masterpiece, published between 1776 and 1789, stands out for its high-quality and ironic prose, extensive use of primary sources, and its critical examination of organized religion.

Nikolay Karamzin: Nikolay Karamzin was a renowned Russian historian, writer, and poet. He is most famous for his monumental work, the 12-volume History of the Russian State, which remains an essential national historical account.

Charles A. Beard: Charles A. Beard was an American historian and professor at Columbia University. He is known for his radical re-evaluation of the Founding Fathers, which claimed their economic motivations were more significant than their philosophical ideals. His most influential book, "An Economic Interpretation of the Constitution of the United States" (1913), sparked controversy and led to a reinterpretation of early American history.

Fernand Braudel: Fernand Braudel, a French historian and leader of the Annales School, is known for his significant contributions to the fields of Mediterranean studies, civilization and capitalism, and the identity of France. He played a vital role in the development of the Annales School of French historiography and social history, and was a student of Henri Hauser.

Eric Hobsbawm: Eric Hobsbawm was a British historian who focused on the study of industrial capitalism, socialism, and nationalism. He is well-known for his works on the "long 19th century" and the "short 20th century." He also introduced the concept of "invented traditions" through an influential edited volume. Hobsbawm, a lifelong Marxist, was deeply influenced by his socio-political convictions, which shaped the nature of his work.

Leopold von Ranke: Leopold von Ranke, a German historian and pioneer of modern source-based history, introduced the seminar teaching method and emphasized archival research and analysis of historical documents. He established the first historical seminar, revolutionizing historical writing by prioritizing reliance on primary sources, emphasizing narrative history, and focusing on international politics. He was ennobled in 1865, adding "von" to his name.

A. J. P. Taylor: A. J. P. Taylor was a renowned British historian, journalist, and broadcaster, known for his expertise in 19th- and 20th-century European diplomacy. He gained popularity through his television lectures, earning the nickname "the Macaulay of our age" for his combination of academic excellence and public appeal. In a 2011 poll, he was ranked the fourth most significant historian of the past 60 years by History Today magazine.

Frederick Jackson Turner: Frederick Jackson Turner was an influential American historian in the early 20th century. He developed the frontier thesis and taught at the University of Wisconsin-Madison and Harvard University. Turner trained numerous PhDs who later became renowned historians. He emphasized interdisciplinary and quantitative approaches, particularly focusing on the Midwest region of the United States.

Milton Friedman: Milton Friedman, a renowned American economist and statistician, won the Nobel Memorial Prize in Economic Sciences in 1976 for his groundbreaking research on consumption analysis, monetary history, and stabilization policy. Alongside George Stigler, he spearheaded the Chicago school of economics, which rejected Keynesianism in favor of monetarism and later embraced new classical macroeconomics. Many of Friedman's students and mentees at the University of Chicago, such as Gary Becker, Robert Fogel, and Robert Lucas Jr., went on to become influential economists themselves.

John Kenneth Galbraith: John Kenneth Galbraith, aka Ken Galbraith, was a renowned Canadian-American economist and diplomat. His books on economics were widely acclaimed and popular for over five decades. Galbraith was known for his inclination towards post-Keynesian economics with an institutionalist viewpoint.

Friedrich Hayek: Friedrich Hayek, also known as F.A. Hayek, was an influential Austrian-British economist and political philosopher known for his contributions to various fields. He received the Nobel Memorial Prize in Economic Sciences in 1974 for his work on money, economic fluctuations, and the interdependence of economic, social, and institutional phenomena. Hayek's idea about how prices convey information is considered a significant contribution to economics.

John Maynard Keynes: John Maynard Keynes, a notable English economist and philosopher, revolutionized macroeconomics and governmental economic policies. Trained in mathematics, he refined the understanding of business cycles and became one of the most influential economists of the 20th century. His writings formed the basis of Keynesian economics and its derivatives, with his ideas remaining central to mainstream macroeconomics. He is revered as the "father of macroeconomics."

Thomas Robert Malthus: Thomas Robert Malthus: English economist, cleric, and scholar, known for his influence in political economy and demography.

Karl Marx: Karl Marx, a German philosopher and revolutionary socialist, was a prominent figure in various disciplines such as economics, politics, history, sociology, and journalism. His significant contributions include the famous publication "The Communist Manifesto" in 1848 and the extensive analysis of capitalism in "Das Kapital" from 1867 to 1894, employing his critical approach of historical materialism. His ideas and theories, collectively known as Marxism, have had a profound impact on the intellectual, economic, and political history of modern society.

Vilfredo Pareto: Vilfredo Pareto was an influential Italian polymath known for his contributions to economics. He extensively studied income distribution and individual decision-making, and popularized the term "elite" in social analysis.

David Ricardo: David Ricardo, a prominent British political economist and politician, played a vital role in the field of classical economics. He is considered highly influential and is often mentioned alongside renowned figures including Thomas Malthus, Adam Smith, and James Mill.

Paul Samuelson: Paul Samuelson was an influential American economist who won the Nobel Memorial Prize in Economic Sciences in 1970. He elevated the level of scientific analysis in economic theory and is regarded as the "Father of Modern Economics". Samuelson is considered the foremost academic economist of the 20th century.

Adam Smith: Adam Smith was a Scottish economist and philosopher known as "The Father of Economics" and "The Father of Capitalism". His most notable works are The Theory of Moral Sentiments and The Wealth of Nations, which is considered a groundbreaking modern work in economics. Smith explores various factors like politics, society, environment, and technology in explaining the distribution of wealth and power, rejecting the notion of God's will. He also introduces the concept of absolute advantage in economics.

Mikhail Bakunin: Mikhail Bakunin, a Russian revolutionary anarchist and influential figure in anarchism, was a major advocate of revolutionary socialism, social anarchism, and collectivist anarchism. He achieved great popularity and gained substantial influence among radicals in Russia and Europe, becoming one of the most famous ideologues in Europe.

Edmund Burke: Edmund Burke - Anglo-Irish statesman and philosopher. Spent career in Great Britain, serving as a member of Parliament (MP) from 1766 to 1794. Aligned with the Whig Party.

Chanakya: Chanakya, an ancient Indian polymath, was a renowned teacher, author, strategist, philosopher, economist, jurist, and royal advisor. He was the author of the Arthashastra, an influential political treatise, considered a precursor to classical economics. Chanakya played a major role in establishing the Maurya Empire, serving as the chief advisor to Emperor Chandragupta and his son Bindusara. His work was lost for centuries but rediscovered in the early 20th century.

Antonio Gramsci: Antonio Gramsci was an influential Italian Marxist philosopher, writer, and politician. He wrote extensively on various topics including philosophy, politics, sociology, history, and linguistics. As a founding member of the Italian Communist Party, he became a prominent critic of Benito Mussolini and fascism. Gramsci was imprisoned in 1926 and remained so until his death in 1937.

Thomas Hobbes: Thomas Hobbes was an influential English philosopher known for his writings on social contract theory in his book Leviathan. He made significant contributions to various fields like political philosophy, history, theology, and ethics, establishing himself as one of the founders of modern political philosophy.

Peter Kropotkin: Peter Kropotkin, a Russian anarchist and geographer, was a noted advocate for anarchist communism.

John Locke: John Locke, an influential English philosopher and physician, is known as the "father of liberalism" and a key figure in the Enlightenment. He contributed to social contract theory, epistemology, and political philosophy. His writings influenced prominent thinkers such as Voltaire, Rousseau, and the American Revolutionaries. Locke's ideas greatly affected the development of classical republicanism and liberal theory, as seen in the United States Declaration of Independence. His political-legal principles continue to shape limited representative government and the protection of basic rights worldwide.

Niccolò Machiavelli: Niccolò Machiavelli, a renowned Florentine diplomat, author, and philosopher of the Renaissance era, is famed for his political treatise "The Prince." Considered the father of modern political philosophy and science, Machiavelli's work was published posthumously in 1532, five years after his demise.

Montesquieu: Montesquieu, also known as Charles Louis de Secondat, was a French judge, historian, and political philosopher.

Thomas Paine: Thomas Paine, an English-born American Founding Father and political activist, was a key figure in the American Revolution. He authored influential pamphlets like "Common Sense" and "The American Crisis" which inspired the Patriots to declare independence from Great Britain. Paine's ideas centered around Enlightenment-era ideals of human rights.

Pierre-Joseph Proudhon: Pierre-Joseph Proudhon, a French socialist, philosopher, and economist, is known as the "father of anarchism" for founding the mutualist philosophy. He was the first to call himself an anarchist and is a prominent figure in anarchist theory. Proudhon served in the French Parliament and identified as a federalist. His philosophy sought the balance between community and property, often linked to individualist or social anarchism.

Herbert Spencer: Herbert Spencer was a versatile English scholar known for his work as a philosopher, psychologist, biologist, sociologist, and anthropologist. He coined the phrase "survival of the fittest" after reading Darwin's book, connecting it with the concept of natural selection. Spencer expanded this notion to encompass sociology and ethics, and also supported Lamarckism.

Alexis de Tocqueville: Alexis de Tocqueville, a French aristocrat, diplomat, and scholar, is renowned for his influential works on democracy and society. His most notable works include Democracy in America and The Old Regime and the Revolution, where he scrutinized the living standards, social conditions, and the interplay of individuals, the market, and the state in Western societies. Democracy in America, inspired by his travels in the United States, is recognized as one of the early pillars of sociology and political science.

Mary Wollstonecraft: Mary Wollstonecraft, a British writer and philosopher, was a pioneer in advocating for women's rights. Despite her unconventional personal relationships, her writings gained recognition centuries later. She is now considered one of the founding feminist philosophers, with her life and works serving as significant influences for feminists today.

Noam Chomsky: Noam Chomsky is an influential American professor, linguist, and political activist. He is considered the "father of modern linguistics" and has made significant contributions to analytic philosophy and cognitive science. Chomsky holds prestigious positions at the University of Arizona and MIT. With over 150 books, he is one of the most cited living authors, covering subjects like linguistics, war, and politics. Ideologically, he aligns with anarcho-syndicalism and libertarian socialism.

Pāṇini: Pāṇini, an esteemed scholar in ancient India, was a logician, Sanskrit philologist, and grammarian. He lived between the 6th and 4th century BCE.

Ferdinand de Saussure: Ferdinand de Saussure, a Swiss linguist, semiotician, and philosopher, was a key figure in 20th-century linguistics and semiotics. He is widely recognized as one of the founders of these fields, laying the groundwork for important developments.

Sequoyah: Sequoyah, also known as George Gist or George Guess, was a Native American polymath and neographer of the Cherokee Nation. In 1821, he created the Cherokee syllabary, allowing reading and writing in Cherokee. This remarkable achievement made him one of the few individuals in history to develop a writing system for a pre-literate group. His invention enabled the Cherokee nation to become one of the earliest Indigenous groups in North America to have a written language. Additionally, Sequoyah represented the Cherokee nation in Washington, D.C., signing two important relocation and trading treaties.

Noah Webster: Noah Webster was an influential figure in American education and language. He was a lexicographer, writer, and editor, known for his efforts in spelling reform. His famous "Blue-backed Speller" books taught multiple generations of American children. Webster's name is closely associated with dictionaries in the United States, particularly the modern Merriam-Webster dictionary, first published in 1828.

Theodor W. Adorno: Theodor W. Adorno was a renowned German philosopher, musicologist, and social theorist.

Pierre Bourdieu: Pierre Bourdieu was a renowned French sociologist known for his influential contributions to education, sociology, and aesthetics. He held prominent positions at the School for Advanced Studies in Paris and the Collège de France, establishing his reputation as a leading public intellectual.

W. E. B. Du Bois: W. E. B. Du Bois: American sociologist, historian, and activist known for his pan-Africanist civil rights advocacy.

Émile Durkheim: Émile Durkheim, a French sociologist, is recognized as a key figure in the development of sociology. He is considered one of the main founders of modern social science, alongside Karl Marx and Max Weber.

Friedrich Engels: Friedrich Engels: German philosopher, political theorist, historian, journalist, and revolutionary socialist. Closest collaborator of Karl Marx. Also a businessman.

Marcel Mauss: Marcel Mauss was a French sociologist and anthropologist, known as the "father of French ethnology." He bridged the gap between sociology and anthropology, analyzing topics like magic, sacrifice, and gift exchange in various cultures worldwide. Mauss greatly influenced Claude Lévi-Strauss, founder of structural anthropology, and his most renowned work is 'The Gift' (1925).

Talcott Parsons: Talcott Parsons was a highly influential American sociologist known for his social action theory and structural functionalism. He earned a PhD in economics and taught at Harvard University from 1927 to 1973, playing a role in the establishment of the sociology department and the Department of Social Relations.

Max Weber: Max Weber was a German sociologist, historian, jurist, and political economist, integral to the development of modern sociology. His profound ideas had a significant impact on social theory and research, making him one of the most important theorists in the development of modern Western society.

Franz Boas: Franz Boas: German-American anthropologist and pioneer of modern anthropology, known as the "Father of American Anthropology". Associated with historical particularism and cultural relativism movements.

Clifford Geertz: Clifford Geertz, a prominent American anthropologist, was a strong advocate and influential figure in the field of symbolic anthropology. Widely considered the most influential cultural anthropologist in the US for three decades, he held the position of professor emeritus at the Institute for Advanced Study in Princeton until his death.

Claude Lévi-Strauss: Claude Lévi-Strauss, a French anthropologist and ethnologist, played a crucial role in advancing the theories of structuralism and structural anthropology. He held the chair of Social Anthropology at the Collège de France from 1959 to 1982 and was a distinguished member of the Académie française. Lévi-Strauss received recognition and honors from various global universities and institutions.

Bronisław Malinowski: Bronisław Malinowski, a Polish-British anthropologist, is renowned for his significant contributions to the field of anthropology. His influential writings on ethnography, social theory, and field research have left a lasting impact on the discipline.

Margaret Mead: Margaret Mead - American cultural anthropologist, prominent author and speaker in the mass media during the 1960s-1970s.

Alfred Radcliffe-Brown: Alfred Radcliffe-Brown was an influential English social anthropologist who played a key role in advancing the theory of structural functionalism.

Heinrich Schliemann: Heinrich Schliemann was a German businessman and influential amateur archaeologist. He believed in the historical accuracy of places mentioned in Homer's works and excavated Hisarlik, which is now believed to be the site of Troy, along with Mycenae and Tiryns. His work supported the idea that the Iliad reflects historical events. However, his excavation methods have been criticized for destroying important historical artifacts, including the presumed site of the historical Troy.

Gotthold Ephraim Lessing: Gotthold Ephraim Lessing was a influential German philosopher, dramatist, and art critic of the Enlightenment era. His plays and writings significantly shaped German literature, and he is recognized as the first dramaturg at Abel Seyler's Hamburg National Theatre.

Edward Said: Edward Said was a Palestinian-American academic, literary critic, political activist, and musician. He co-founded post-colonial studies and his book, Orientalism (1978), is a key critique of Western cultural representations of the Orient. His approach to textual analysis revolutionized the fields of literary theory, literary criticism, and Middle Eastern studies.

Giorgio Vasari: Giorgio Vasari was an influential Italian Renaissance painter and architect. He is famous for his book "Lives of the Most Excellent Painters, Sculptors, and Architects," which remains a major reference in art history. Vasari covers numerous artists, including Leonardo da Vinci and Michelangelo, but his work is known to contain factual errors, especially for artists predating his time.

Theodor Mommsen: Theodor Mommsen: German scholar, historian, jurist, journalist, politician, and archaeologist. Renowned classicist of the 19th century. His research on Roman history is highly influential. Awarded the Nobel Prize in Literature in 1902 for his monumental work, "A History of Rome." Influential figure in German politics. Notable impact on German civil code with works on Roman law and obligations.

Louis Braille: Louis Braille, a French educator, invented braille, a reading and writing system for visually impaired people. His system, used globally, remains unchanged today.

Maria Montessori: Maria Montessori, an Italian physician and educator, is well-known for her philosophy of education and scientific pedagogy. She started off in a technical school but shifted to medical school, where she graduated with honors, becoming one of Italy's early women in medicine. Her innovative educational method is currently implemented in numerous public and private schools worldwide.

Cesare Beccaria: Cesare Beccaria was an influential Italian criminologist, philosopher, and jurist during the Age of Enlightenment. His renowned work, "On Crimes and Punishments," denounced torture and the death penalty, establishing the foundation of modern criminal law and justice. Considered a prominent figure in the field of penology and the Classical School of criminology, Beccaria is widely regarded as one of the greatest thinkers of his time.

William Blackstone: William Blackstone was an English jurist and Tory politician known for his Commentaries on the Laws of England, a famous description of English common law. He was educated at Oxford and became a barrister before pursuing a successful career in university administration. Blackstone gave up his legal practice to deliver influential lectures on English law and wrote An Analysis of the Laws of England, which sold well and introduced his later works.

Hugo Grotius: Hugo Grotius, also known as Hugo de Groot or Huig de Groot, was a Dutch humanist, diplomat, lawyer, theologian, and poet. He is considered a teenage prodigy, studying at Leiden University. He was imprisoned for his involvement in religious disputes in the Dutch Republic but managed to escape hidden in a chest of books. Grotius wrote his major works in exile in France.

William Murray, 1st Earl of Mansfield: William Murray, 1st Earl of Mansfield, was a British barrister, politician, and judge known for his law reform efforts. He belonged to the Scottish Clan Murray and was educated in Perth before moving to London at 13. He attended Christ Church, Oxford, and became a skilled barrister upon joining Lincoln's Inn.

John Marshall: John Marshall was an influential American statesman and lawyer. He served as the fourth chief justice of the United States from 1801 until his death in 1835. Marshall is known for his long tenure on the Supreme Court and his impact on American jurisprudence. He had also served as the U.S. secretary of state and a representative in the U.S. House of Representatives from Virginia, making him one of the few to have served in all three branches of the federal government.

Edward Bernays: Edward Bernays was an influential American figure in the fields of public relations and propaganda. Known as the "father of public relations," he worked for major corporations like Procter & Gamble, General Electric, and government agencies. Bernays gained recognition for his campaigns, such as the 1929 effort to empower women through cigarette branding and the controversial work he did for the United Fruit Company in the 1950s, which played a role in the overthrow of the Guatemalan government.

Alfred Kinsey: Alfred Kinsey was a pioneering American sexologist and biologist who founded the Institute for Sex Research at Indiana University in 1947, now known as the Kinsey Institute. He is famous for writing the Kinsey Reports, which examined sexual behavior in both males and females. Kinsey's controversial research on human sexuality has had a lasting impact on social and cultural values, both in the United States and internationally.

Jane Jacobs: Jane Jacobs was a prominent American-Canadian journalist, author, theorist, and activist. She significantly impacted urban studies, sociology, and economics. In her influential book, The Death and Life of Great American Cities (1961), Jacobs voiced her opposition to urban renewal and slum clearance, arguing that these approaches failed to address the actual needs of city-dwellers.

Gordon Allport: Gordon Allport was an influential American psychologist known for his focus on personality psychology. He rejected psychoanalytic and behavioral approaches, developing an eclectic theory based on traits. Allport emphasized the importance of understanding the uniqueness of individuals and the present context in shaping personality.

Albert Bandura: Albert Bandura, a Canadian-American psychologist and professor at Stanford University, made significant contributions to social science and psychology.

Raymond Cattell: Raymond Cattell was a prominent British-American psychologist known for his extensive research on various aspects of psychology, including personality, cognition, motivation, and social behavior. He authored numerous scholarly books, research articles, and psychometric tests. While highly esteemed in his field, Cattell's controversial associations with white supremacists and neo-Nazis have raised concerns.

Albert Ellis: Albert Ellis, an American psychologist and psychotherapist, founded rational emotive behavior therapy (REBT) and was a key figure in the cognitive revolutionary paradigm shift in psychotherapy. He held advanced degrees in clinical psychology from Columbia University and founded the Albert Ellis Institute in New York City. Ellis was known for his contributions to cognitive-behavioral therapies.

Erik Erikson: Erik Erikson was a prominent child psychoanalyst known for his theory on the psychosocial development of individuals. He introduced the concept of an "identity crisis" and was of German-American descent.

Leon Festinger: Leon Festinger was an American social psychologist who developed the theory of cognitive dissonance and social comparison. He challenged the behaviorist view of social psychology, popularizing the use of laboratory experiments while emphasizing the study of real-life situations. Festinger gained recognition for infiltrating a doomsday cult to investigate its dynamics. He also contributed to social network theory with the concept of the proximity effect.

Anna Freud: Anna Freud was a British psychoanalyst of Austrian-Jewish descent, born in Vienna. She was the youngest child of Sigmund Freud and Martha Bernays. Anna Freud followed in her father's footsteps and made significant contributions to the field of psychoanalysis. She is considered one of the founders of psychoanalytic child psychology, along with Hermine Hug-Hellmuth and Melanie Klein.

Sigmund Freud: Sigmund Freud, an Austrian neurologist, founded psychoanalysis - a method for treating mental disorders arising from conflicts in the mind. It involves dialogue between patient and psychoanalyst, leading to the development of a unique theory of mind and human agency.

Carl Jung: Carl Jung, a Swiss psychiatrist, established analytical psychology and was renowned as a prolific writer, illustrator, and correspondent.

Kurt Lewin: Kurt Lewin: German-American psychologist, a pioneer in social and applied psychology in the United States. Known for his work on applied research, action research, and group communication.

Abraham Maslow: Abraham Maslow, an American psychologist, developed the theory of Maslow's hierarchy of needs, which prioritizes fulfilling innate human needs leading to self-actualization. He emphasized focusing on positive qualities in individuals, rather than viewing them as collections of symptoms. Maslow was a renowned psychology professor and considered one of the most cited psychologists of the 20th century.

George Armitage Miller: George Armitage Miller, an American psychologist, was a pioneer in cognitive psychology and cognitive science. He also made significant contributions to psycholinguistics and developed WordNet, an online word-linkage database. His renowned paper, "The Magical Number Seven, Plus or Minus Two," established the average limit of seven for human short-term memory capacity. Miller received numerous awards, including the prestigious National Medal of Science.

Ivan Pavlov: Ivan Pavlov was a Russian neurologist and physiologist known for discovering classical conditioning through his dog experiments.

Jean Piaget: Jean Piaget was a Swiss psychologist known for his groundbreaking research on child development. His theory of cognitive development, referred to as "genetic epistemology," is highly influential and has greatly contributed to our understanding of how children learn and develop their understanding of the world.

Carl Rogers: Carl Rogers, an American psychologist, co-founded humanistic psychology and is renowned for his person-centered psychotherapy. He is considered a pioneer in psychotherapy research and received the Award for Distinguished Scientific Contributions from the American Psychological Association in 1956.

B. F. Skinner: B. F. Skinner was an influential American psychologist and behaviorist known as the father of Behaviorism. He served as the Edgar Pierce Professor of Psychology at Harvard University from 1958 to 1974.

Edward Thorndike: Edward Thorndike was an influential American psychologist known for his work on comparative psychology, learning processes, and connectionism. He spent most of his career at Teachers College, Columbia University, where he contributed to the scientific groundwork of educational psychology. Additionally, Thorndike provided solutions for industrial issues, including employee examinations and testing.

Lev Vygotsky: Lev Vygotsky, a Soviet psychologist, is renowned for his contributions to the understanding of children's psychological development and his development of the cultural-historical activity theory.

John B. Watson: John B. Watson was an influential American psychologist known for popularizing behaviorism. He delivered a significant address in 1913 titled "Psychology as the Behaviorist Views It," which revolutionized the field. Watson conducted research on animal behavior, child rearing, and advertising, including controversial experiments like "Little Albert" and the Kerplunk experiment. Additionally, he served as the editor of Psychological Review. A survey ranked him as the 17th most cited psychologist of the 20th century.

Wilhelm Wundt: Wilhelm Wundt, a German physiologist and philosopher, is recognized as one of the pioneers of modern psychology. He is credited with establishing psychology as a separate scientific discipline and was the first person to refer to himself as a psychologist.

Kapila: Kapila, a sage in Hindu tradition, is known as the founder of the Samkhya school of Hindu philosophy. He was the son of the sage Kardama and Devahuti, and his home was in Mithila. Kapila, estimated to have lived in the 6th or 7th century BCE, had a significant influence on Buddha and Buddhism.

Patanjali: Patanjali, also known as Gonardiya or Gonikaputra, was a Hindu author, mystic, and philosopher. He is believed to have lived between the 2nd century BCE and the 4th century CE. Patanjali is respected as an embodiment of Adi Sesha, the divine serpent.

Valmiki: Valmiki, revered as the first poet and Ādi Kavi, is a legendary poet celebrated as the author of the epic Ramayana. His attribution in the text itself solidifies his role as the creator of the first epic poem.

Vyasa: Vyasa, also known as Krishna Dvaipayana or Vedavyasa, is a highly respected sage in Hindu traditions. He is widely believed to be the author of the significant epic Mahābhārata.

Basava: Basava, also known as Basaveshwara and Basavanna, was an Indian philosopher, poet, and social reformer. He played a key role in the Shiva-focused bhakti movement and sought to bring about reform in the Lingayat community. Basava was particularly influential during the rule of King Bijjala II in Karnataka, India, and worked towards social reforms within the Hindu Shaivite tradition.

Gaudapada: Gaudapada, an influential Hindu philosopher and scholar, belonged to the Advaita Vedanta school of Hindu philosophy. Though little is known about his life, his ideas greatly influenced Adi Shankara, who regarded him as a Paramaguru.

Kumārila Bhaṭṭa: Kumārila Bhaṭṭa, an influential Hindu philosopher in medieval India, was a leading scholar of the Mimamsa school. Known for his work Mimamsaslokavarttika, he strongly believed in the supreme authority of Vedic teachings and was a devout ritualist. His most significant work, the Varttika, serves as a subcommentary to Sabara's commentary on Jaimini's Purva Mimamsa Sutras. Scholars classify his philosophy as existential realism.

Madhvacharya: Madhvacharya, also known as Purna Prajna and Ānanda Tīrtha, was an influential Indian philosopher and theologian. He was the main advocate of the Dvaita (dualism) school of Vedanta. His philosophy, called Tattvavāda, emphasized arguments from a realist viewpoint.

Ramanuja: Ramanuja, or Ramanujacharya, was an influential Indian Hindu philosopher and social reformer. He played a key role in the Sri Vaishnavism tradition within Hinduism and had a significant impact on the Bhakti movement.

Adi Shankara: Adi Shankara, also known as Adi Shankaracharya, was an 8th-century Indian scholar and teacher. His works offered a holistic interpretation of sastras, emphasizing the liberation of self. He combined the teachings of Advaita Vedanta prevalent during his era.

Sri Aurobindo: Sri Aurobindo, an Indian philosopher, yogi, poet, nationalist, and journalist, played a pivotal role in India's independence movement. Later, he transitioned into a spiritual reformer, sharing his insights on human progress and spiritual evolution.

Chaitanya Mahaprabhu: Chaitanya Mahaprabhu was a 15th-century Indian saint, considered to be the combined avatar of Radha and Krishna. He worshipped Krishna through singing, dancing, and bhajan-kirtan, significantly influencing Vaishnavism in Bengal. He founded Gaudiya Vaishnavism and promoted the chanting of the Hare Krishna Maha-mantra. He also propagated the Vedantic philosophy of Achintya Bheda Abheda Tattva and composed the Shikshashtakam.

A. C. Bhaktivedanta Swami Prabhupada: A.C. Bhaktivedanta Swami Prabhupada was an Indian spiritual teacher and the founder of the "Hare Krishna movement". He established the International Society for Krishna Consciousness (ISKCON) and is seen as a representative of Chaitanya Mahaprabhu by his followers.

Ramakrishna: Ramakrishna Paramahansa was an Indian Hindu mystic, devoted to the goddess Kali. He practiced a variety of religious traditions and believed that different religions lead to the same goal. He taught that diverse religions can unite people in the realization of God, and is considered by his followers to be a divine incarnation of God.

Ramana Maharshi: Ramana Maharshi, an Indian Hindu sage, achieved spiritual liberation as a jivanmukta. Also known as Bhagavan Sri Ramana Maharshi, he was born as Venkataraman Iyer.

Swami Vivekananda: Swami Vivekananda, born Narendranath Datta, was an influential Indian Hindu monk and philosopher. He was the chief disciple of Ramakrishna, an Indian mystic. Vivekananda played a crucial role in introducing Vedanta and Yoga to the Western world. He is considered the father of modern Indian nationalism, credited with promoting interfaith understanding and elevating Hinduism to a major global religion.

Paramahansa Yogananda: Paramahansa Yogananda was an Indian-American Hindu monk and guru who brought meditation and Kriya Yoga to millions through his organization, Self-Realization Fellowship. Sent by his guru to spread yoga teachings in the West, he immigrated to America at 27, promoting a balance between Western material growth and Indian spirituality. He played a significant role in the American yoga movement, earning the title "Father of Yoga in the West."

The Buddha: The Buddha, Siddhartha Gautama, was an influential religious teacher who lived in South Asia during the 6th or 5th century BCE. He was a wandering ascetic and the founder of Buddhism.

Nagarjuna: Nagarjuna, an Indian Buddhist philosopher (c.150-c.250 CE), was a prominent monk of the Madhyamaka school in Mahayana Buddhism. He is recognized as one of the most significant Buddhist philosophers and is regarded by some as a leading figure in Asian philosophy.

Padmasambhava: Padmasambhava, also known as Guru Rinpoche, was a medieval Indian Vajrayana master who taught Buddhism in Tibet. He played a crucial role in building Samye Monastery, the first Buddhist monastery in Tibet. Little is known about his actual historical figure, but he is renowned for his association with Vajrayana and Indian Buddhism.

Bodhidharma: Bodhidharma is a semi-legendary Buddhist monk credited with transmitting Chan Buddhism to China. He is considered the first Chinese patriarch and trained the monks of Shaolin Monastery, leading to the creation of Shaolin kungfu. Known as Dámó in China and Daruma in Japan, his name means "dharma of awakening" in Sanskrit.

Lushan Huiyuan: Lushan Huiyuan was a Chinese Buddhist teacher who founded Donglin Temple and wrote On Why Monks Do Not Bow Down Before Kings. He was born in Shanxi and died in Jiujiang. He moved from the north to the south to live within the Eastern Jin Dynasty.

Huineng: Huineng, the Sixth Patriarch of Chan Buddhism, is a significant figure in Chinese Buddhism. He was an uneducated layman who achieved enlightenment upon hearing the Diamond Sutra. Despite his lack of formal training, he demonstrated his deep understanding to the fifth patriarch and was chosen as the true successor instead of the publicly favored Shenxiu.

Kumārajīva: Kumārajīva, a revered Buddhist monk, scholar, and missionary from Kucha, is renowned as a highly influential translator of Chinese Buddhism. His translations are considered unmatched in both technical skill and faithfulness, as stated by Lu Cheng.

Zhiyi: Zhiyi, also known as Chen De'an, was the fourth patriarch of the Tiantai tradition of Buddhism in China. He was a renowned Śramaṇa, connecting him to Indian asceticism. Zhiyi is revered for creating a comprehensive classification of Buddhist teachings, marking a significant departure from Indian traditions and developing an original Chinese system.

Ānanda: Ānanda was the primary attendant of the Buddha and known for his exceptional memory. He is credited with recalling the Buddha's teachings during the First Buddhist Council, making him the Treasurer of the Dhamma. Ānanda was the first cousin of the Buddha and became ordained as a monk under Puṇṇa Mantānīputta. After twenty years, he became the Buddha's devoted attendant, acting as a mediator between the Buddha, the laypeople, and the saṅgha. Ānanda accompanied the Buddha until his death, serving as an assistant, secretary, and spokesperson.

Maudgalyayana: Maudgalyāyana, also known as Mahāmaudgalyāyana or Kolita, was one of Buddha's closest disciples and a contemporary of renowned disciples like Śāriputra and Mahākāśyapa. He is considered the second foremost male disciple along with Śāriputra. Maudgalyāyana became a spiritual wanderer in his youth, searching for truth until he encountered the teachings of Buddhism. He eventually met the Buddha, ordained as a monk, and quickly achieved enlightenment.

Śāriputra: Śāriputra was a top disciple of the Buddha and one of his two chief male disciples, along with Maudgalyāyana. He played a key leadership role in the Buddha's ministry and had a significant impact on the development of Buddhist Abhidharma. He is often mentioned in Mahayana sutras and sometimes symbolizes the Hinayana school of Buddhism.

Vasubandhu: Vasubandhu was a prominent Buddhist monk and scholar from Gandhara. He wrote influential commentaries on Abhidharma, representing Sarvastivada and Sautrāntika perspectives. He co-founded the Yogacara school after embracing Mahayana Buddhism, alongside his half-brother Asanga.

Dōgen: Dōgen was an influential Japanese Buddhist priest, writer, poet, and philosopher. He is recognized as the founder of the Sōtō school of Zen in Japan. His contributions led to the development of Zen teachings, emphasizing meditation and direct realization of one's true nature.

Kūkai: Kūkai, also known as Kōbō Daishi, was a Japanese Buddhist monk who founded the Shingon school of Buddhism. He studied in China and upon his return, he established Shingon in Japan. Kūkai gained support from Emperors to spread Shingon teachings and build temples. He also undertook public works and chose Mount Kōya as a sacred site. Kūkai spent his final years there, passing away in 835 C.E.

14th Dalai Lama: The 14th Dalai Lama, also known as Gyalwa Rinpoche, is the highest spiritual leader and head of Tibet. He is considered a living Bodhisattva, an emanation of Avalokiteśvara and Chenrezig. He is a monk and leader of the Gelug school of Tibetan Buddhism. The central government of Tibet granted him temporal duties until his exile in 1959.

Rabbi Akiva: Rabbi Akiva, also known as Akiva ben Joseph, was a renowned Jewish scholar and sage in the first and second centuries. He made significant contributions to the Mishnah and Midrash halakha. Referred to as the "Chief of the Sages" in the Talmud, Rabbi Akiva met with a tragic fate and was executed by the Romans following the Bar Kokhba revolt.

Baal Shem Tov: The Baal Shem Tov, also known as Israel ben Eliezer or Yisroel ben Eliezer, was a Jewish mystic and healer. He is considered the founder of Hasidic Judaism. The term "BeshT" is an acronym for Baal Shem Tov, meaning "Master of the Good Name," referring to a holy man with the secret name of God.

Judah Loew ben Bezalel: Judah Loew ben Bezalel, known as Rabbi Loew or the Maharal of Prague, was a renowned Jewish scholar who excelled in the fields of Talmudic studies, Jewish mysticism, mathematics, astronomy, and philosophy. He held prominent rabbinical positions in Mikulov and Prague throughout his life.

Maimonides: Maimonides, or Moses ben Maimon, was an influential Sephardic Jewish philosopher, Torah scholar, astronomer, and physician in the Middle Ages. He served as the personal physician of Saladin and worked in various roles in Morocco and Egypt.

Rashi: Rashi, or Shlomo Yitzchaki, was a medieval French rabbi famous for his comprehensive commentaries on the Talmud and Hebrew Bible.

Vilna Gaon: The Vilna Gaon, also known as Elijah ben Solomon Zalman, was a prominent leader of non-hasidic Jewry in Lithuania. He was a renowned Talmudist, halakhist, and kabbalist, and is often referred to as the "genius from Vilnius."

Jesus: Jesus was a Jewish preacher and religious leader in the first century. He is central to Christianity and believed by most Christians to be the incarnation of God the Son. Jesus is also known as Jesus Christ and Jesus of Nazareth. He is seen as the awaited messiah prophesied in the Hebrew Bible.

Mary, mother of Jesus: Mary, mother of Jesus, was a Jewish woman from Nazareth who was married to Joseph. She is revered in Christianity, with various titles like virgin and queen mentioned in the Litany of Loreto. The Eastern Orthodox, Oriental Orthodox, Church of the East, Catholic, Anglican, and Lutheran churches believe she is the Mother of God. Protestant views on Mary differ, with some assigning her lesser status.

John the Apostle: John the Apostle, also known as Saint John the Beloved, was a disciple of Jesus and one of the Twelve Apostles. He is believed to be the youngest apostle and the son of Zebedee and Salome. His brother James was also an apostle. John was referred to by various names such as John the Evangelist, John of Patmos, John the Elder, and the Beloved Disciple. According to Church Fathers, he outlived the other apostles and died of natural causes, although scholars debate the truth of these assertions.

Judas Iscariot: Judas Iscariot, a disciple and one of the original Twelve Apostles of Jesus Christ, betrayed Jesus to the Sanhedrin in the Garden of Gethsemane by kissing him and revealing his identity to the arresting crowd. His name is commonly associated with betrayal and treason, parallel to Brutus.

Saint Peter: Saint Peter, also called Peter the Apostle, was a leader among Jesus Christ's Twelve Apostles and an important figure in the early Christian Church. He is mentioned prominently in all four New Testament gospels and the Acts of the Apostles. Additionally, according to Catholic and Orthodox tradition, Peter is considered the first bishop of Rome (pope) and Antioch.

John the Baptist: John the Baptist was a preacher in Judea in the early 1st century AD. He is considered a saint and known by various names in different religious traditions, such as Saint John the Forerunner and Prophet Yahya. His significant role included baptizing people in the Jordan River.

Mary Magdalene: Mary Magdalene was a devoted follower of Jesus who witnessed his crucifixion and resurrection. She is mentioned more frequently than most apostles and any other woman in the gospels, aside from Jesus's family. The name "Magdalene" suggests she may have come from the town of Magdala in Roman Judea.

Paul the Apostle: Paul the Apostle, also known as Saint Paul, was a Christian apostle who played a vital role in spreading Jesus' teachings in the first-century world. He is considered a significant figure of the Apostolic Age and is credited with founding Christian communities in Asia Minor and Europe from the mid-40s to the mid-50s AD. Additionally, his contributions to the New Testament have cemented his importance in Christian history.

Ambrose: Ambrose of Milan, a theologian and statesman, was the Bishop of Milan from 374 to 397. He vigorously defended Roman Christianity against Arianism and paganism, and left behind a significant body of writings. His most renowned works are the ethical commentary De officiis ministrorum and the exegetical Exameron. He was a highly influential figure in the 4th century due to his powerful preaching, impactful actions, literary contributions, and innovative musical hymnography.

Arius: Arius was a Cyrenaic presbyter, ascetic, and priest. Though traditionally believed to be the founder of Arianism, recent insights suggest he did not dominate the mid-century eastern Church with his teachings.

Athanasius of Alexandria: Athanasius of Alexandria, also known as Athanasius the Great, was a Christian theologian and leader in the fourth century. He served as the 20th Greek Orthodox patriarch of Alexandria for 45 years, enduring five exiles ordered by four Roman emperors. Athanasius was a prominent Church Father, recognized for his defense of Trinitarianism against Arianism. He played a crucial role in shaping Christian theology during his time.

Basil of Caesarea: Basil of Caesarea, known as Saint Basil the Great, was a prominent bishop and theologian from Caesarea Mazaca in Asia Minor. He played a crucial role in supporting the Nicene Creed and challenging heresies such as Arianism and the followers of Apollinaris of Laodicea. Basil's influential position and alliances enabled him to effectively advocate for the Nicene stand, skillfully balancing theology and politics.

Benedict of Nursia: Benedict of Nursia, a revered Italian Christian monk, theologian, and writer, is venerated by various Christian denominations and declared the patron saint of Europe by Pope Paul VI in 1964.

Clement of Alexandria: Clement of Alexandria, also known as Titus Flavius Clemens, was a Christian theologian and philosopher who taught at the Catechetical School of Alexandria. He was highly influenced by Hellenistic philosophy, particularly Plato and the Stoics. Clement's knowledge extended to classical Greek literature as well. He had notable pupils like Origen and Alexander of Jerusalem. His fragments of secret works indicate familiarity with pre-Christian Jewish esotericism and Gnosticism. Notably, he argued that Greek philosophy had non-Greek origins, citing Egyptian scholars as the teachers of Plato and Pythagoras.

Cyril and Methodius: Cyril and Methodius were Byzantine Christian theologians and missionaries who evangelized the Slavs. They are known as the "Apostles to the Slavs."

Cyril of Alexandria: Cyril of Alexandria: Patriarch of Alexandria from 412 to 444. Played a major role in Christological controversies of 4th and 5th centuries. Key figure in the Council of Ephesus in 431, leading to Nestorius' deposition. Regarded as a Church Father and Doctor of the Church. Called "Pillar of Faith" and "Seal of all the Fathers." Denounced as a heretic by Nestorian bishops.

Saint George: Saint George, also known as George of Lydda, was a Christian soldier in the Roman army. He refused to renounce his faith and was sentenced to death. He is highly revered as a saint and martyr in Christianity, particularly as a military saint during the Crusades. He is respected by Christians, Druze, and some Muslims for his unwavering commitment to monotheistic faith.

Gregory of Nazianzus: Gregory of Nazianzus, a 4th-century archbishop and theologian, infused Hellenism into the early church, establishing the Byzantine theological tradition. Widely recognized for his rhetorical skills, he is considered the most accomplished stylist of his time.

Gregory of Nyssa: Gregory of Nyssa was a bishop in Cappadocia from 372 to 376 and from 378 to 395. He is revered as a saint in various Christian denominations. Together with his brother Basil of Caesarea and their friend Gregory of Nazianzus, he is known as one of the Cappadocian Fathers.

Irenaeus: Irenaeus was a Greek bishop who played a significant role in guiding and expanding Christian communities in southern France. He is recognized for his efforts in combating heretical interpretations of Scripture by defining proto-orthodoxy and contributing to the development of Christian theology. Irenaeus had direct connections with the Apostles through Polycarp and was the last known person to have this connection.

Jerome: Jerome of Stridon, a prominent early Christian figure, was a priest, theologian, translator, and historian. He is widely recognized as Saint Jerome.

John Chrysostom: John Chrysostom, an important Early Church Father and archbishop of Constantinople, was renowned for his eloquent preaching and public speaking. He boldly spoke out against abuse of authority by religious and political leaders. Chrysostom's Divine Liturgy of Saint John Chrysostom and ascetic lifestyle were also notable. His Greek epithet, Χρυσόστομος, meaning "golden-mouthed", highlighted his celebrated eloquence. Additionally, Chrysostom was one of the most prolific authors of the early Christian Church.

John of Damascus: John of Damascus, an Arab Christian monk and priest from Damascus, was born around 675 or 676. He was known as a hymnographer, defender of the Christian faith, and lived until his death on 4 December 749, believed to have been at his monastery, Mar Saba, near Jerusalem.

Saint Nicholas: Saint Nicholas, also known as Nicholas of Myra, was an early Christian bishop from Myra in Asia Minor during the Roman Empire. He is recognized for his many miracles and is referred to as Nicholas the Wonderworker. Saint Nicholas is known as the patron saint of sailors, merchants, archers, repentant thieves, children, brewers, pawnbrokers, unmarried people, and students across Europe. His reputation and secret gift-giving tradition led to the creation of the traditional model of Sinterklaas.

Origen: Origen of Alexandria, also known as Origen Adamantius, was a highly influential early Christian scholar, ascetic, and theologian. He lived in Alexandria and wrote about 2,000 treatises on various theological topics, including textual criticism, biblical interpretation, preaching, and spirituality. Despite his significant contributions, Origen was a controversial figure in early Christian theology and asceticism. His brilliance earned him the title of "the greatest genius the early church ever produced."

Tertullian: Tertullian, an influential early Christian writer from Carthage, was known for his extensive corpus of Latin Christian literature. He defended the Christian faith against heresy, particularly contemporary Gnosticism. Often referred to as "the father of Latin Christianity" and "the founder of Western theology."

Clement of Rome: Clement of Rome, also known as Pope Clement I, was a bishop of Rome in the late first century AD. He held office from 88 AD to his death in 99 AD and is considered the first Apostolic Father of the Church. Alongside Polycarp and Ignatius of Antioch, he is recognized as one of the three chief Apostolic Fathers.

Pope Leo I: Pope Leo I, also known as Leo the Great, served as Bishop of Rome from 440 until his death in a summary.

Pope Gregory I: Pope Gregory I, also known as Saint Gregory the Great, was the bishop of Rome from 590 to his death. He initiated a significant mission, known as the Gregorian mission, to convert the Anglo-Saxons to Christianity. His writings were prolific, surpassing those of any previous pope. He is referred to as Saint Gregory the Dialogist in Eastern Christianity due to his Dialogues. The epithet "Dialogos" or "Dialogus" is sometimes attached to his name in translations of Eastern texts.

Anselm of Canterbury: Anselm of Canterbury was an Italian Benedictine monk, philosopher, and theologian who later became Archbishop of Canterbury from 1093 to 1109. He was canonized as a saint after his death and declared a Doctor of the Church in 1720 by Pope Clement XI.

Bonaventure: Bonaventure, an Italian Catholic bishop, was known as a cardinal, scholastic theologian, and philosopher.

Francis of Assisi: Francis of Assisi, an Italian mystic and Catholic friar, founded the Franciscan religious order. He embraced poverty and preached as a beggar. Canonized in 1228, he is highly revered in Christianity. Often depicted in a brown habit with a symbolic rope around his waist, representing vows of poverty, chastity, and obedience.

Jan Hus: Jan Hus was a Czech theologian and philosopher who became a Church reformer and inspired Hussitism. He is considered the first Church reformer and influenced the approval of a reformed Bohemian religious denomination. His teachings also had a significant impact on Martin Luther.

Ignatius of Loyola: Ignatius of Loyola was a Spanish Catholic priest and theologian who founded the Jesuits and became their first Superior General in 1541.

John of the Cross: John of the Cross was a Spanish Catholic priest, mystic, and Carmelite friar. He played a significant role in the Counter-Reformation in Spain and is recognized as one of the thirty-seven Doctors of the Church.

Mother Teresa: Mother Teresa, born Mary Teresa Bojaxhiu, was a Catholic nun from Albania who founded the Missionaries of Charity. She moved to Ireland and then to India, where she spent the majority of her life. She was canonized by the Catholic Church as Saint Teresa of Calcutta on September 4, 2016. Her feast day is celebrated on September 5th, the date of her death.

Teresa of Ávila: Teresa of Ávila, also known as Saint Teresa of Jesus, was a Spanish Carmelite nun and religious reformer who had a significant impact as a mystic in Spain.

Tomás de Torquemada: Tomás de Torquemada, also known as Thomas of Torquemada, was a Dominican friar from Castile who became the first Grand Inquisitor of the Tribunal of the Holy Office. He played a prominent role in the Spanish Inquisition, a religious organization formed in 1478 to maintain Catholic religious orthodoxy. This Inquisition was responsible for upholding religious unity in the Kingdom of Spain, which consisted of the united lands of Castile and Aragon.

John Wycliffe: John Wycliffe, an influential English philosopher and theologian, was a reformer and Catholic priest in the 14th century. He challenged the powerful role of the clergy and supported their radical poverty. Considered a precursor to Protestantism, he also translated the Bible and taught at the University of Oxford.

Francis Xavier: Saint Francis Xavier was a Spanish Catholic missionary, co-founder of the Society of Jesus, and the first Christian missionary in Japan, representing the Portuguese empire.

Pope Pius IX: Pope Pius IX, who reigned from 1846 to 1878, holds the record for the longest papal reign. He convened the influential First Vatican Council in 1868 but lost control of the Papal States to Italy in 1870. Following this, he declared himself a "prisoner in the Vatican" and refused to leave Vatican City.

Pope John XXIII: Pope John XXIII, head of Catholic Church and Vatican City State from 1958 until his death in 1963. Born into a sharecropper family in Lombardy, Italy, he became a priest in 1904 and held various roles, including a cardinal and patriarch. Elected as pope at 76, he surprised by initiating the influential Second Vatican Council in 1962.

Pope John Paul II: Pope John Paul II, the leader of the Catholic Church from 1978 until 2005, held significant influence over the Vatican City State during his tenure.

Patriarch Nikon of Moscow: Patriarch Nikon of Moscow (also known as Nikita Minin) was the seventh leader of the Russian Orthodox Church from 1652 to 1666. Known for his eloquence, energy, and piety, he had a close relationship with Tsar Alexis of Russia. However, his controversial liturgical reforms caused a lasting schism known as Raskol in the church. Despite being a dominant political figure for many years, he was eventually stripped of his powers and reduced to a simple monk by a synod of church officials in 1667.

Grigori Rasputin: Grigori Rasputin, a Russian mystic, gained significant influence in the final years of the Russian Empire by befriending Nicholas II, the last Emperor of Russia and his family.

Jacobus Arminius: Jacobus Arminius was a Dutch Reformed minister and theologian during the Protestant Reformation. His ideas formed the basis of Arminianism and the Dutch Remonstrant movement. He was a professor of theology at the University of Leiden and authored numerous theological writings.

Karl Barth: Karl Barth was a Swiss theologian known for his influential work, "The Epistle to the Romans." He played a significant role in the Confessing Church and authored the Barmen Declaration. Barth's most prominent achievement was his unfinished theological masterpiece, the multi-volume "Church Dogmatics." His impact extended beyond academics to mainstream culture, earning him a cover feature on Time magazine in April 1962.

Dietrich Bonhoeffer: Dietrich Bonhoeffer was a German Lutheran pastor, theologian, and anti-Nazi dissident. He co-founded the Confessing Church and his writings on Christianity's role in the world have been widely influential. Known for his resistance to the Nazi regime, he opposed Hitler's euthanasia program and persecution of Jews. He was arrested by the Gestapo in 1943 and imprisoned for one-and-a-half years before being transferred to Flossenbürg concentration camp.

John Calvin: John Calvin was a French theologian and key figure in the Protestant Reformation in Geneva. He developed the system of theology known as Calvinism, which emphasized predestination and God's absolute sovereignty in salvation. His influence can be seen in Congregational, Reformed, and Presbyterian churches worldwide.

Thomas Cranmer: Thomas Cranmer was an influential leader of the English Reformation and Archbishop of Canterbury during the reigns of Henry VIII, Edward VI, and briefly Mary I. He played a key role in securing the annulment of Henry's marriage to Catherine of Aragon, leading to the separation of the English Church from the Holy See. Cranmer also favored the principle of royal supremacy, granting the king authority over the Church within his realm, alongside Thomas Cromwell.

Jonathan Edwards (theologian): Jonathan Edwards was an influential American preacher and theologian known for his role in the Great Awakening revivalist movement. He was also a notable philosopher and a Congregationalist.

Billy Graham: Billy Graham, an American evangelist and civil rights advocate, was a well-known figure for his international broadcast and live sermons. As an ordained Southern Baptist minister, he played a prominent role in the evangelical Christian movement in the United States for six decades.

John Knox: John Knox, a Scottish minister, theologian, and writer, played a key role in leading Scotland's Reformation. Notably, he founded the Presbyterian Church of Scotland.

Martin Luther: Martin Luther, a German priest and theologian, led the Protestant Reformation. He was a prolific author, hymnwriter, and professor, known for his foundational role in Lutheranism.

Philip Melanchthon: Philip Melanchthon, a German Lutheran reformer and Martin Luther's collaborator, was an influential figure in the Protestant Reformation. He was the first systematic theologian of the movement and played a significant role in shaping educational systems during this period.

Desmond Tutu: Desmond Tutu, a South African Anglican bishop, was a prominent anti-apartheid and human rights activist. He held the positions of Bishop of Johannesburg and Archbishop of Cape Town, being the first black African to do so. Tutu sought to merge black theology with African theology in his theological work.

John Wesley: John Wesley was an influential English cleric, theologian, and evangelist, known for leading a revival movement within the Church of England called Methodism. He established societies that sparked the growth of the independent Methodist movement, which still thrives today.

Huldrych Zwingli: Huldrych Zwingli was a Swiss leader of the Reformation, born during a period of growing Swiss patriotism and criticism of the Swiss mercenary system. He attended prestigious universities and served as a pastor, with a major influence from the writings of Erasmus.

Joseph Smith: Joseph Smith Jr. was an American religious leader who founded Mormonism and the Latter Day Saint movement. He published the Book of Mormon at the age of 24, gathering a significant following before his death. Today, millions of people worldwide follow the religion he established, primarily through the largest church, the Church of Jesus Christ of Latter-day Saints.

Mary Baker Eddy: Mary Baker Eddy was an influential American religious leader, founder of The Church of Christ, Scientist, and The Christian Science Monitor. She authored the widely acclaimed Science and Health with Key to the Scriptures and established important religious magazines. Her legacy also includes the Manual of The Mother Church and Prose Works Other than Science and Health.

Muhammad: Muhammad, an Arab leader and the founder of Islam, was a prophet who preached and confirmed monotheistic teachings. Believed to be the Seal of the Prophets, his teachings and the Quran are the foundation of Islamic belief.

Khadija bint Khuwaylid: Khadija bint Khuwaylid, the daughter of a noble from the Quraysh tribe, was the first wife and follower of Prophet Muhammad. She was a successful merchant based in Makkah.

Fatima: Fatima, also known as Fatima al-Zahra, was the daughter of Prophet Muhammad and his wife Khadija. She was married to Ali, the fourth Rashidun Caliph and first Shia Imam. Her sons, Hasan and Husayn, became the second and third Shia Imams. Fatima is revered in Shia Islam, often compared to Mary, and considered an exemplary figure for Muslim women. Muhammad held her in high esteem and she is admired for her compassion, generosity, and resilience. Her lineage persists till today, and her name continues to be popular among Muslim girls.

Aisha: Aisha was the youngest wife of Islamic prophet Muhammad and is known as the "Mother of the Believers" in Islamic writings due to her special status among his wives mentioned in the Qur'an.

Abu Hanifa: Abu Hanifa, or Imam Abu Hanifa, was a prominent Muslim theologian and jurist who founded the Hanafi school of Sunni jurisprudence. His school of thought is widely practiced in Central Asia, Afghanistan, Iran, Turkey, the Balkans, Russia, Circassia, Pakistan, Bangladesh, India, and parts of the Arab world. He is revered as al-Imām al-Aʿẓam and Sirāj al-Aʾimma by Sunni Muslims.

Ahmad ibn Hanbal: Ahmad ibn Hanbal was an eighth-century Muslim scholar who founded the Hanbali school of jurisprudence. He was highly influential and had a profound impact on traditionalist Sunni Islam. Ahmad emphasized the use of scriptural sources and compiled the significant hadith collection called the Musnad.

Ibn Taymiyya: Ibn Taymiyya was a Sunni Muslim scholar known for his involvement in the Battle of Marj al-Saffar and his diplomatic work with Ghazan Khan. He was also a Hanbali jurist and a theologian who rejected saint veneration and tomb visitations. Due to his controversial views, he was imprisoned multiple times.

Malik ibn Anas: Malik ibn Anas, known as al-Imām Mālik, was a prominent Muslim jurist, theologian, and hadith traditionist. He was born in Medina and became the foremost scholar of prophetic traditions, striving to apply them to all aspects of Muslim jurisprudence. Malik's views on jurisprudence were highly esteemed, and he founded the Maliki school of Sunni law. This school became widely adopted in North Africa, Al-Andalus, Egypt, Syria, Yemen, Sudan, Iraq, and Khorasan, alongside influential Sufi orders like Shadiliyya and Tijaniyyah.

Muhammad ibn Abd al-Wahhab: Muhammad ibn Abd al-Wahhab was a prominent Sunni Muslim scholar and reformer from central Arabia. He is considered the founder of the Wahhabi movement, with influential students such as his sons and grandson. He played a key role in shaping Islamic theology, preaching, and activism, with his teachings eventually influencing the religious and political landscape of the region.

Muhammad al-Bukhari: Muhammad al-Bukhari, also known as Imām al-Bukhāri, was a prominent 9th-century Muslim scholar known for his extensive work on hadith, or sayings of the Prophet Muhammad. He is highly respected in Sunni Islam as the most significant hadith scholar. Al-Bukhari authored several important texts, including Sahih al-Bukhari, which is a famous collection of authentic hadith. Additionally, he wrote Al-Tarikh al-Kabir, a historical work, and Al-Adab al-Mufrad, a book on ethics.

Muslim ibn al-Hajjaj: Muslim ibn al-Hajjaj, also known as Imam Muslim, was a renowned Islamic scholar from Nishapur. He is famous for his collection of authentic hadiths called Sahih Muslim. This collection is considered one of the most reliable and significant in Sunni Islam, alongside Sahih al-Bukhari.

Al-Nawawi: Al-Nawawi, also known as Imam Nawawi, was an influential Sunni Shafi'ite jurist and hadith scholar. Despite his early death at the age of 45, he left behind an extensive collection of writings covering various subjects such as hadith, theology, biography, and jurisprudence. His works continue to be widely read and studied today.

Al-Shafi'i: Al-Shafi'i was a Muslim theologian and scholar known as "Shaykh al-Islām". He played a significant role in establishing the principles of Islamic jurisprudence and was one of the four great Sunni Imams. His teachings led to the formation of the Shafi'i school of fiqh. He studied under Imam Malik ibn Anas and served as a judge in Najran. Al-Shafi'i lived in various places, including Palestine, Mecca, Medina, Yemen, Baghdad, and Egypt.

Al-Ghazali: Al-Ghazali, a Persian polymath, was a prominent and influential figure in Islamic history. He was known for his expertise in jurisprudence, legal theory, theology, philosophy, logic, and mysticism. His full name is Abu Hamid Muhammad ibn Muhammad at-Tusi al-Ghazali, and he was called Imam Muhammad-i Ghazali in Persian-speaking countries and Algazelus or Algazel in Medieval Europe.

Ibn Arabi: Ibn Arabi was a renowned Andalusi Muslim scholar, mystic, poet, and philosopher, who greatly influenced Islamic thought. He is credited with 850 works, of which 700 are authentic and over 400 still exist today. His teachings on cosmology became widely accepted in various Muslim regions.

Ali: Ali ibn Abi Talib, a cousin and son-in-law of Muhammad, was the fourth caliph and the first Shia Imam, ruling from 656 to 661. He was raised by Muhammad and played a crucial role in the early years of Islam, when Muslims faced persecution in Mecca.

Husayn ibn Ali: Husayn ibn Ali was a prominent figure in early Islam, renowned as the grandson of Prophet Muhammad and the son of Ali ibn Abi Talib and Fatima, Muhammad's daughter. He is considered the third Imam in Shia Islam, following his brother Hasan and preceding his son Ali ibn Husayn. As a member of the Ahl al-Bayt, he holds great significance and is recognized as a participant in the event of Mubahala. Muhammad referred to him and his brother Hasan as leaders of the youth in Paradise.

Ja'far al-Sadiq: Jaʿfar al-Ṣādiq, an 8th-century Shia Muslim scholar and jurist, founded the Jaʿfarī school of Islamic jurisprudence. He was the sixth Imam of the Twelver and Ismāʿīlī denominations of Shīʿa Islam. His teachings, along with his predecessor al-Bāqir, have more hadith reports than all other Shīʿīte Imams and even Prophet Muhammad combined. Jaʿfar al-Ṣādiq made significant contributions to theology, including elaborating on the doctrines of nass, isma, and taqiya.

Mulla Sadra: Mulla Sadra, also known as Mullā Ṣadrā, was a Persian philosopher, theologian, and Islamic mystic in the 17th century. He played a significant role in the Iranian cultural renaissance. Considered the most influential philosopher in the Muslim world during the past four centuries.

Helena Blavatsky: Helena Blavatsky, also known as Madame Blavatsky, was a Russian-American mystic and author who co-founded the Theosophical Society in 1875. She became famous internationally as a leading theoretician in Theosophy.

Aleister Crowley: Aleister Crowley, an English occultist, founded Thelema and proclaimed himself the prophet to lead humanity into the Æon of Horus. He was a versatile artist, excelling as a philosopher, ceremonial magician, poet, painter, novelist, mountaineer, and prolific writer.

Baháʼu'lláh: Baháʼu'lláh, founder of the Baháʼí Faith, was born into a noble Persian family and was exiled for following the Bábí Faith. In 1863, he declared his divine revelation in Iraq and spent the remainder of his life imprisoned in the Ottoman Empire. His teachings emphasized unity, spiritual growth, and global governance.

Mahavira: Mahavira, also known as Vardhamana, was the 24th tirthankara of Jainism and the successor of Parshvanatha. Born in ancient India in the 6th century BCE, he abandoned his royal life and pursued spiritual enlightenment. Through intense meditation, he attained omniscience and preached for 30 years. He achieved liberation, or moksha, in the 6th century BCE.

Guru Gobind Singh: Guru Gobind Singh was the tenth Sikh Guru, who became the leader of the Sikhs at the age of nine after his father was executed. He was a warrior, poet, and philosopher. Sadly, all four of his sons died during his lifetime.

Guru Nanak: Guru Nanak, also called Baba Nanak, was the pioneering Guru who founded Sikhism and served as the first of the ten Sikh Gurus. His birth, commemorated as Guru Nanak Gurpurab, occurs on the day of Katak Pooranmashi in October or November.

Zoroaster: Zoroaster, also known as Zarathustra, was a religious reformer who founded Zoroastrianism, the first documented monotheistic religion. His teachings influenced major philosophical and religious figures, including Plato, Pythagoras, and the Abrahamic religions. Zoroastrians consider him a prophet who challenged ancient Iranian traditions, while he is also revered as a prophet in the Ahmadiyya branch of Islam and Baháʼí Faith. He was a native speaker of Avestan and lived in the eastern part of the Iranian plateau, although his birthplace remains uncertain.

Ezana of Axum: Ezana of Axum was a ruler of the Kingdom of Aksum and the first king to adopt Christianity as the official religion. He succeeded his father at a young age, with his mother serving as a regent until he came of age. Ezana is known for being one of the most well-documented rulers of Aksum.

Gaiseric: Gaiseric, a ruler of the Vandals and Alans, reigned from 428 to 477 and was instrumental in the fall of the Western Roman Empire in the 5th century.

Narmer: Narmer, an ancient Egyptian pharaoh of the Early Dynastic Period, is considered by many scholars as the unifier of Egypt and founder of the First Dynasty. He had a significant influence in Canaan and is often believed to be the same person as Menes. Neithhotep is thought to be either his queen consort or daughter.

Thutmose I: Thutmose I, the third pharaoh of the 18th Dynasty of Egypt, expanded Egypt's borders into the Levant and Nubia during his reign. He constructed numerous temples in Egypt and built a tomb in the Valley of the Kings, becoming the first confirmed king to do so.

Hatshepsut: Hatshepsut, the Great Royal Wife of Pharaoh Thutmose II, was the fifth Pharaoh of Egypt's Eighteenth Dynasty. She ruled as regent first and then as queen regnant from around 1479 BC until approximately 1458 BC. Hatshepsut was Egypt's second confirmed queen regnant, with the first being Sobekneferu/Nefrusobek in the Twelfth Dynasty.

Thutmose III: Thutmose III, also known as Thutmose the Great, was the sixth pharaoh of the 18th Dynasty in ancient Egypt. He ruled from 1479 to 1425 BC, starting at the age of two. Initially, he shared power with his stepmother, Hatshepsut, who was also named pharaoh. Thutmose III led the armies of Hatshepsut and appointed his son, Amenhotep II, as co-regent towards the end of his reign. His firstborn son, Amenemhat, died before him.

Akhenaten: Akhenaten, aka Akhenaton or Echnaton, was an Egyptian pharaoh from 1353-1336 or 1351-1334 BC. He was the tenth ruler of the Eighteenth Dynasty and was previously known as Amenhotep IV before his fifth year of reign.

Nefertiti: Nefertiti, queen of Ancient Egypt's 18th Dynasty, and her husband, Pharaoh Akhenaten, introduced the earliest form of monotheism in Ancient Egypt. Their rule, during the wealthiest period in Egyptian history, saw the promotion of Atenism, centered around the sun disc and its connection to the royal household. There is debate over whether Nefertiti briefly ruled as Neferneferuaten after Akhenaten's death, leading to the fall of Amarna and the capital's return to Thebes.

Tutankhamun: Tutankhamun, also known as Tutankhamon or Tutankhamen, was a pharaoh of ancient Egypt's Eighteenth Dynasty. He was the antepenultimate ruler of the dynasty, and his death marked the end of the royal line.

Ramesses II: Ramesses II, also known as Ramesses the Great, was an influential Egyptian pharaoh from the Nineteenth Dynasty. Considered one of the New Kingdom's greatest rulers, he led 15 successful military campaigns, except for the notable Battle of Kadesh.

Ramesses III: Ramesses III was a Pharaoh who ruled during the Twentieth Dynasty in Ancient Egypt from 26 March 1186 to 15 April 1155 BC. He is recognized as the final influential monarch of the New Kingdom in Egypt.

Ptolemy I Soter: Ptolemy I Soter was a Macedonian Greek general and historian who succeeded Alexander the Great and founded the Ptolemaic Kingdom in Egypt. He ruled as basileus and pharaoh from 305/304 BC until his death, establishing a flourishing center of Hellenistic civilization in Egypt, particularly in the city of Alexandria.

Cleopatra: Cleopatra VII Thea Philopator, the last ruler of Egypt's Ptolemaic Kingdom, reigned from 51 to 30 BC. She descended from Ptolemy I Soter, a Macedonian Greek general and companion of Alexander the Great. Following her death, Egypt became a Roman province, marking the end of the Hellenistic period and the age since Alexander. Cleopatra was unique among Ptolemaic ruler as she learned the Egyptian language despite her first language being Koine Greek.

Cao Cao: Cao Cao, a Chinese statesman, warlord, and poet, attained great power in the late Eastern Han dynasty. He established the precursor to the Cao Wei state, succeeded by his son Cao Pi, marking the end of the Eastern Han and the start of the Three Kingdoms period. Legends also emerged, depicting Cao Cao's skill, cruelty, and peculiarities.

Emperor Gaozu of Han: Emperor Gaozu of Han, Liu Bang, was the founder and first emperor of the Han dynasty (202-195 BC). He was commonly referred to as Gaozu, even though his temple name was Taizu and his posthumous name was Emperor Gao.

Modu Chanyu: Modu Chanyu was the founder of the Xiongnu Empire in 209 BCE. He became the leader by having his father, Touman, assassinated.

Qin Shi Huang: Qin Shi Huang, the first emperor of China's Qin dynasty, unified the country and introduced a new title, "emperor." Reigning from 221 to 210 BC, he established a precedent for future Chinese monarchs, who would adopt this title for the next 2000 years.

Emperor Wu of Han: Emperor Wu of Han, the seventh emperor of the Han dynasty, reigned from 141 to 87 BC. His 54-year rule remains the longest in Chinese history by an ethnic Han emperor. He expanded the Chinese civilization's influence through geopolitics and centralized the state through policies mixing Legalist and Confucian principles. Known for his religious innovations, he supported the arts, particularly poetry and music. Additionally, he fostered cultural contact with western Eurasia, increasing its influence on Chinese society.

Yu the Great: Yu the Great, also known as Yu the Engineer, was a legendary king in ancient China, famous for his successful flood control efforts and for establishing the Xia dynasty, marking the beginning of dynastic rule in China. He was highly regarded for his moral character and was praised by Confucius and other Chinese scholars. Posthumously honored as "the Great," Yu remains one of the few Chinese monarchs with this title.

Gwanggaeto the Great: Gwanggaeto the Great, the nineteenth monarch of Goguryeo, had a posthumous name that described him as a peacemaker and a supreme king. His era name was Yeongnak, and he is sometimes referred to as Yeongnak Taewang. He held an imperial reign title, which elevated Goguryeo to the status of an empire alongside China's imperial dynasties.

Ajatashatru: Ajatashatru, also known as Ajatasattu, was a significant king of the Haryanka dynasty in East India. He seized the Magadha kingdom from his father, King Bimbisara, and later defeated the Vajjika League, including the republic of Vaishali. Ajatashatru is noted for his role as a contemporary of both Mahavira and Gautama Buddha. He established the fortified city of Pataliputra.

Ashoka: Ashoka the Great was the Mauryan Emperor of Magadha in ancient India from 268 to 232 BCE. His vast empire spanned from Afghanistan to Bangladesh, with its capital in Pataliputra. Ashoka is known for promoting Buddhism and facilitating its spread throughout Asia.

Chandragupta II: Chandragupta II, a ruler of the Gupta Empire in India, was known as Vikramaditya. He was the third ruler and his reign was significant.

Chandragupta Maurya: Chandragupta Maurya founded the Maurya Empire in Magadha around 320 BCE. His reign lasted from 320 BCE to 298 BCE. Under his grandson Ashoka the Great, the empire reached its peak from 268 BCE to 231 BCE. The political structure of Chandragupta's time is unclear, but the Mauryan empire was loosely united with autonomous regions within its boundaries.

Kanishka: Kanishka I, also known as Kanishka the Great, was a legendary emperor of the Kushan dynasty. He achieved significant military, political, and spiritual accomplishments, ruling over an extensive empire that stretched from Central Asia and Gandhara to Pataliputra. His main capital was located in Puruṣapura, with another major capital at Mathura. Kanishka's coins were even discovered in Tripuri.

Menander I: Menander I Soter was a notable Greco-Bactrian and Indo-Greek king. He ruled over a vast territory in Northwestern Indian Subcontinent with Sagala as his capital. Menander is renowned for his role as a patron and potential convert to Greco-Buddhism. He is considered one of the most prominent Indo-Greek kings.

Samudragupta: Samudragupta was the second emperor of the Gupta Empire in ancient India. He is considered one of India's greatest rulers. Born to Emperor Chandragupta I and Kumaradevi, a Licchavi princess, Samudragupta significantly extended his dynasty's political and military influence.

Mithridates VI Eupator: Mithridates VI Eupator ruled the Kingdom of Pontus from 120 to 63 BC. He was a formidable opponent of the Roman Republic, aiming to dominate Asia Minor and the Black Sea region. Despite waging multiple wars against Rome, he was unable to break their dominion. Mithridates was known for his effectiveness, ambition, and ruthlessness as a ruler. He developed an immunity to poisons through mithridatism, regularly consuming sub-lethal doses. After his death, he was honored with the title Mithridates the Great.

Tigranes the Great: Tigranes the Great was a king of Armenia from 95 BC to 55 BC. He belonged to the Artaxiad dynasty and successfully expanded the Armenian kingdom beyond its traditional borders, becoming the most powerful state to the east of the Roman Republic. Tigranes claimed the title of Great King or King of Kings during his reign.

Zenobia: Zenobia was a queen from the third century who ruled over the Palmyrene Empire in Syria. She married the city's ruler and after his death, she became the regent for her son and held power throughout his reign. Zenobia's husband brought Palmyra to power by defeating the Persian Empire and stabilizing the Roman East.

Ashurbanipal: Ashurbanipal was the final great king of the Neo-Assyrian Empire, ruling from 669 to 631 BC. He ascended the throne as his father's favored heir and had one of the longest reigns in Assyrian history. While his rule represented the peak of ancient Assyria, it also signaled the decline of Assyrian dominance as it marked the end of their military campaigns in the region.

Hammurabi: Hammurabi, the 6th king of the Old Babylonian Empire, ruled from approx. 1792 to 1750 BC. He expanded his empire by conquering Larsa, Eshnunna, and Mari city-states. He also defeated Assyria's king and made their ruler pay tribute, establishing Babylonian rule over most of Mesopotamia. His reign marked a significant period of expansion and consolidation of power in Babylonian history.

Nebuchadnezzar II: Nebuchadnezzar II was a Neo-Babylonian emperor from 605 BC to 562 BC, renowned as Nebuchadnezzar the Great. He was the longest-reigning king of the Babylonian dynasty, known for his military campaigns and construction projects in Babylon, including the Hanging Gardens. He holds significance in Jewish history and was one of the most powerful rulers of his time.

Antigonus I Monophthalmus: Antigonus I Monophthalmus, a Macedonian Greek general, succeeded Alexander the Great and became a prominent military leader in his army. He controlled significant portions of Alexander's empire and took the title of king in 306 BC. Antigonus established the Antigonid dynasty, which ruled over Macedonia until it was conquered by the Roman Republic in 168 BC.

Antiochus III the Great: Antiochus III the Great was a Greek Hellenistic king who ruled the Seleucid Empire from 223 to 187 BC. He expanded the empire's territory through successful military campaigns in western Asia, but was eventually defeated by Rome. He took on the titles of Basileus Megas and the Great, reflecting his military prowess and ambitions.

Seleucus I Nicator: Seleucus I Nicator, a Macedonian Greek general, was the successor of Alexander the Great and founder of the Seleucid Empire. Initially a secondary player, he eventually became the ruler of Asia Minor, Syria, Mesopotamia, and the Iranian plateau. His empire was a major power in the Hellenistic world until it was conquered by the Roman Republic and Parthian Empire in the late second and early first centuries BC.

Puduḫepa: Puduḫepa, a Hittite queen married to King Hattusili III, was one of the most influential women in the ancient Near East.

Cyrus the Great: Cyrus the Great, founder of the Achaemenid Persian Empire, expanded his territory by defeating the Median Empire and other ancient Near East states. Under the rule of his successor Darius the Great, the Achaemenid Empire became the world's first superpower, stretching from Southeast Europe to the Indus Valley.

Darius the Great: Darius the Great was a Persian ruler who served as the third King of Kings of the Achaemenid Empire from 522 BCE to 486 BCE. He ruled over an expansive empire that stretched from Western Asia and parts of the Balkans to Central Asia, the Indus Valley, and portions of North Africa and Northeast Africa.

Xerxes I: Xerxes I, also known as Xerxes the Great, was the fourth King of Kings of the Achaemenid Empire. He ruled from 486 BC until his assassination in 465 BC. Xerxes invaded Greece in 480 BC but was ultimately defeated. He inherited a vast empire and consolidated his power by suppressing revolts in Egypt and Babylon. Xerxes led a large army and achieved victories at Thermopylae and Artemisium. He captured Athens before being defeated at the Battle of Salamis. Xerxes retreated back to Asia, leaving Mardonius to continue the campaign. Mardonius was defeated the following year, effectively ending the Persian invasion.

Sargon of Akkad: Sargon of Akkad, also called Sargon the Great, was the first ruler of the Akkadian Empire in the 24th to 23rd centuries BC. Known for conquering the Sumerian city-states, he is considered the earliest recorded person to govern an empire.

Attila: Attila the Hun, ruler from 434 to 453, led an empire in Central and Eastern Europe comprising Huns, Ostrogoths, Alans, Bulgars, and more.

Decebalus: Decebalus, the last Dacian king also known as Diurpaneus, fought three wars against the Roman Empire. He successfully repelled a Roman invasion under the rule of Domitian, leading to a period of independence. Decebalus consolidated his rule during this time.

Alcibiades: Alcibiades, an Athenian statesman and general, was a crucial figure in the latter part of the Peloponnesian War. He held prominent roles as a strategic advisor, military commander, and politician. However, he later experienced a downfall and lost his prominence.

Demosthenes: Demosthenes, a Greek statesman and orator in ancient Athens, was known for his influential speeches that showcased the intellectual prowess and provided insights into the politics and culture of ancient Greece. He studied the speeches of previous great orators to master rhetoric and successfully argued for his inheritance. He also worked as a professional speechwriter and lawyer, writing speeches for private legal suits.

Draco (lawgiver): Draco, also known as Drako or Drakon, was an ancient Greek legislator. He introduced the Draconian constitution, a written code that replaced oral law and blood feuds. This constitution could only be enforced through a court of law.

Lycurgus (lawgiver): Lycurgus, the mythic lawgiver of Sparta according to tradition, implemented reforms based on the Oracle of Apollo. His changes aimed to establish a military-centric society, emphasizing three Spartan virtues: equality, military readiness, and austerity.

Pericles: Pericles was a prominent Greek politician and general during the Golden Age of Athens. He played a significant role in Ancient Athenian politics between the Greco-Persian Wars and the Peloponnesian War. Thucydides, a contemporary historian, hailed him as "the first citizen of Athens." Pericles transformed the Delian League into an Athenian empire and led his people in the initial years of the Peloponnesian War. His leadership, spanning from 461 to 429 BC, is often referred to as the "Age of Pericles."

Pyrrhus of Epirus: Pyrrhus of Epirus, a Greek king and statesman, was known for his leadership skills and opposition to early Rome. Despite being regarded as one of the greatest generals of antiquity, his victories often came at great cost, leading to the term "Pyrrhic victory" to describe a win with heavy losses.

Solon: Solon, an ancient Athenian statesman, was a lawmaker, philosopher, and poet. He is a recognized member of the Seven Sages of Greece and is known for establishing the groundwork for Athenian democracy. Through his constitutional reform, Solon overturned the majority of Draco's laws, addressing political, economic, and moral decadence.

Themistocles: Themistocles was an Athenian politician and general who became prominent during the early years of Athenian democracy. He was a populist with support from lower-class Athenians and often clashed with the aristocracy. In 493 BC, as an elected archon, he persuaded Athens to increase its naval power. He fought at the Battle of Marathon during the first Persian invasion of Greece and may have been one of the generals.

Philip II of Macedon: Philip II of Macedon (359-336 BC) was the king of Macedonia, founder of the Argead dynasty and father of Alexander the Great.

Alexander the Great: Alexander the Great, also known as Alexander III of Macedon, was the ruler of ancient Greek kingdom of Macedon. He ascended to the throne at the age of 20 and led a extensive military campaign across Western Asia and Egypt. By the age of 30, he had established one of the largest empires ever known, spanning from Greece to northwestern India. Regarded as one of the greatest military commanders in history, Alexander was undefeated in battle.

Alaric I: Alaric I, the inaugural ruler of the Visigoths, reigned from 395 to 410. As leader of the Goths, he controlled Moesia, won by the Goths and Alans after the Battle of Adrianople.

Arminius: Arminius, chieftain of the Germanic Cherusci tribe, led an alliance of Germanic tribes to defeat three Roman legions commanded by general Publius Quinctilius Varus at the Battle of the Teutoburg Forest in AD 9. This victory forced the Roman Empire to permanently retreat from Germania Magna and was a major turning point in history, preventing Romanization of the Germanic peoples and marking one of Rome's greatest defeats.

Boudica: Boudica was an ancient British queen of the Iceni tribe who led a unsuccessful rebellion against the Roman Empire in AD 60 or 61. She is revered as a national hero and symbolizes the fight for justice and independence in Britain.

Theodoric I: Theodoric I: King of the Visigoths from 418 to 451, known for crucial role in defeating Attila at the Battle of the Catalaunian Plains, where he tragically lost his life.

Vercingetorix: Vercingetorix, a Gallic king and chief of the Arverni tribe, led an unsuccessful revolt against the Romans in the final stages of Julius Caesar's Gallic Wars. He surrendered to Caesar, spent almost six years imprisoned, and was later executed in Rome.

Cato the Elder: Cato the Elder, a Roman soldier, senator, and historian, was known for his conservatism and opposition to Hellenization. He wrote the first Latin history book, Origines, about Rome's history. De agri cultura, his oldest surviving work, covers agriculture, farming, rituals, and recipes. His epithet "Elder" differentiates him from Cato the Younger, who opposed Julius Caesar.

Gracchi brothers: The Gracchi brothers, Tiberius and Gaius, were influential figures in the late Roman Republic. They served in the plebeian tribunates during 133 BC and 122–121 BC respectively. As advocates for social reform, they were known for their noble backgrounds and eloquence. However, both faced untimely deaths at the hands of the reactionary political system. Their time in power triggered a chain of domestic crises that greatly disturbed and played a part in the downfall of the Roman Republic.

Julius Caesar: Julius Caesar - Roman general and statesman, led Roman armies in Gallic Wars, defeated political rival Pompey, became dictator, critical role in demise of Roman Republic and rise of Roman Empire.

Augustus: Augustus, also known as Octavian, was the founder and first emperor of the Roman Empire. His reign from 27 BC to AD 14 marked the beginning of the Pax Romana, a time of relative peace throughout the Roman world. Augustus established the imperial cult and implemented the Principate system of imperial rule, which lasted until the Crisis of the Third Century.

Tiberius: Tiberius was a Roman emperor who ruled from AD 14 to 37. He became the successor of his stepfather Augustus, the first Roman emperor. Born in 42 BC to Tiberius Claudius Nero and Livia Drusilla, Tiberius' mother divorced his father and married Augustus. Known for his diplomatic skills and military success, Tiberius conquered regions including Pannonia, Dalmatia, Raetia, and parts of Germania, which established the empire's northern frontier.

Caligula: Caligula, also known as Gaius Caesar Augustus Germanicus, was a Roman Emperor from AD 37 to AD 41. He was born into the powerful Julio-Claudian dynasty and was the son of the renowned general Germanicus and Augustus' granddaughter, Agrippina the Elder. Unfortunately, Caligula's reign was cut short by his assassination, just four years after his ascension to power.

Nero: Nero was a Roman emperor who ruled from AD 54 to 68, making him the last emperor of the Julio-Claudian dynasty.

Domitian: Domitian, a member of the Flavian dynasty, was the Roman emperor from 81 to 96. Known as a ruthless and efficient autocrat, he curtailed the powers of the Senate through his authoritarian rule, creating conflict between them. He followed his father, Vespasian, and brother, Titus, as emperor.

Trajan: Trajan was a successful Roman emperor from 98 to 117 AD and one of the Five Good Emperors. He expanded the Roman Empire to its largest extent and was regarded as a philanthropic ruler. The Roman Senate honored him with the title of optimus.

Hadrian: Hadrian was a Roman emperor from 117 to 138. He was born in Italica, Spain, and came from the Aelia gens. He belonged to the Nerva-Antonine dynasty.

Marcus Aurelius: Marcus Aurelius was a Roman emperor and Stoic philosopher who reigned from 161 to 180 AD. He was part of the Nerva-Antonine dynasty and the last of the Five Good Emperors. He was also the final emperor during the Pax Romana period, which brought relative peace and stability to the Roman Empire from 27 BC to 180 AD. Additionally, he held the position of Roman consul in 140, 145, and 161.

Diocletian: Diocletian, also known as Jovius, was a Roman emperor from 284 to 305. Born into a humble family in Dalmatia, he started in the military and eventually became a cavalry commander under Emperor Carus. After Carus and his son died, Diocletian was declared emperor by the troops, defeating Carus's surviving son in battle.

Constantine the Great: Constantine I, also called Constantine the Great, was a Roman emperor who ruled from AD 306 to 337. He was the first emperor to embrace Christianity, influenced by his mother Helena who was later canonized as a saint. Constantine gained military fame under the emperors Diocletian and Galerius and served in both the eastern and western provinces. After his father's death, he became the sole ruler of the Roman Empire by winning civil wars against Maxentius and Licinius.

Theodosius I: Theodosius I, or Theodosius the Great, was a Roman emperor from 379 to 395. He emerged victorious in significant wars against the Goths and civil conflicts. Theodosius played a crucial role in establishing the Nicaean Creed as the accepted doctrine for Christianity. He was the final emperor to rule over the whole Roman Empire before its permanent division between the West and East.

Abd Allah al-Mahdi Billah: Abd Allah al-Mahdi Billah, also known as al-Mahdi bi'llah, was the founder of the Isma'ili Fatimid Caliphate, the prominent Shi'a caliphate in Islamic history. He was the eleventh Imam of the Isma'ili branch of Shi'ism.

Amda Seyon I: Amda Seyon I, also known as Gebre Mesqel, ruled as Emperor of Ethiopia (1314-1344). He belonged to the Solomonic dynasty, and his reign left a significant impact on Ethiopian history.

Baybars: Baybars, also known as Baibars, was the fourth Mamluk sultan of Egypt and Syria in the Bahri dynasty. He led the Egyptian forces to victory against the Seventh Crusade of King Louis IX of France. Baybars also played a significant role in the pivotal Battle of Ain Jalut in 1260, which marked the first significant defeat of the Mongol army and is seen as a turning point in history.

Al-Hakim bi-Amr Allah: Summary: Al-Hakim bi-Amr Allah, the sixth Fatimid caliph and 16th Ismaili imam, ruled from 996 to 1021. He is esteemed by several Shia Ismaili sects, including the Nizaris, Musta'lis, and Druze, with a combined global population of 18-19 million followers.

Mansa Musa: Mansa Musa, the ninth ruler of the Mali Empire, was renowned for his unprecedented wealth and expansive territory. Despite being considered the richest person in history, the precise extent of his riches remains uncertain. His reign marked the zenith of the Mali Empire's territorial dominance, and he gained recognition for his extraordinary generosity.

Al-Nasir Muhammad: Al-Nasir Muhammad was the ninth Mamluk sultan of the Bahri dynasty in Egypt from 1285 to 1341. He ruled during three distinct periods: 1293–1294, 1299–1309, and 1310 until his death. He faced domination by different figures in each reign, executing one and accepting the resignation of another to maintain his authority as sultan.

Batu Khan: Batu Khan, a Mongol ruler and grandson of Genghis Khan, founded the Golden Horde, which was part of the Mongol Empire. His rule spanned over 250 years and included territories such as Kievan Rus', Volga Bulgaria, Cumania, and the Caucasus.

Bumin Qaghan: Bumin Qaghan, also known as Illig Qaghan or Yamï Qaghan, was the founder of the Turkic Khaganate. He was the eldest son of Ashina Tuwu and served as the chieftain of the Turks under the Rouran Khaganate's rule. Bumin is credited with establishing and leading the Turkic Khaganate, playing a significant role in its formation and expansion. He is also mentioned as Tumen of the Rouran Khaganate.

Hulegu Khan: Hulegu Khan, also known as Hülegü or Hulagu, was a Mongol ruler and grandson of Genghis Khan. He conquered a major part of Western Asia. He was the son of Tolui and Princess Sorghaghtani Beki of the Keraite tribe. Hulegu was also a brother to Ariq Böke, Möngke Khan, and Kublai Khan.

Jochi: Jochi Khan, the eldest son of Temüjin (Genghis Khan), was a skilled Mongol army commander. He played a crucial role in his father's conquest of Central Asia, fighting alongside his brothers and uncles. Despite doubts about his paternity, Jochi was an accomplished military leader.

Khosrow I: Khosrow I, also known as Anushirvan, ruled as the Sasanian King of Kings of Iran from 531 to 579. He followed in the footsteps of his father, Kavad I.

Mahmud of Ghazni: Mahmud of Ghazni, also known as Mahmud Ghaznavi, was the ruler of the Ghaznavid Empire from 998 to 1030. Under his leadership, the empire became a powerful military force, stretching from Iran to the Indian subcontinent, Transoxiana, and Makran.

Muhammad of Ghor: Muhammad of Ghor, also known as Muhammad Ghori, was a ruler from Afghanistan who reigned from 1173 to 1206. He was part of the Ghurid dynasty and ruled alongside his brother until his death in 1203. Muhammad extended Islamic rule in South Asia, creating a foundation that lasted for several centuries under Muslim dynasties.

Muhammad II of Khwarazm: Muhammad II of Khwarazm, also known as Alā' al-Din Muhammad, ruled the Khwarazmian Empire from 1200 to 1220. He was a descendant of Anushtegin Gharchai, a Turkic Ghulam who rose to power in the province of Khwarizm. Muhammad II's actions led to the Mongol conquest of his empire, ultimately resulting in its complete devastation.

Nizam al-Mulk: Nizam al-Mulk, also known as Abu Ali Hasan ibn Ali Tusi, was a Persian scholar and vizier of the Seljuk Empire. Despite starting from a humble position, he effectively ruled the empire for 20 years after the assassination of Sultan Alp Arslan in 1072. Nizam al-Mulk's policies had a lasting impact and served as the basis for administrative structures in the Muslim world until the 20th century. He is considered one of the most significant statesmen in Islamic history.

Tamar of Georgia: Tamar of Georgia, also known as Tamar the Great, was a member of the Bagrationi dynasty. She ruled as Queen of Georgia from 1184 to 1213, during the Georgian Golden Age. Tamar's significant achievement was being the first woman to rule Georgia independently, and she was even referred to as "king" in medieval Georgian sources.

Timur: Timur, also known as Tamerlane, was a Turco-Mongol conqueror who founded the Timurid Empire in Afghanistan, Iran, and Central Asia. He was a formidable military leader, renowned for his victories. However, his methods were ruthless and brutal. Despite this, Timur was a significant supporter of art and architecture, engaging with intellectuals during his reign and contributing to the Timurid Renaissance.

Tokhtamysh: Tokhtamysh, ruler of the Golden Horde, briefly united the Blue and White Hordes, creating a single polity.

Tughril I: Tughril I was a Turkoman leader who established the Seljuk Empire in 1037, ruling from 1037 to 1063. He is known for founding and governing the empire.

Hongwu Emperor: Hongwu Emperor, named Zhu Yuanzhang, was the founder of the Ming dynasty. He reigned from 1368 to 1398 and is commonly referred to as Emperor Taizu of Ming.

Emperor Taizong of Tang: Emperor Taizong of Tang (626-649) was the second emperor of the Tang dynasty in China. He played a crucial role in the dynasty's foundation and defeating major adversaries, establishing stable rule over China.

Emperor Taizu of Song: Emperor Taizu of Song, also known as Zhao Kuangyin, founded the Song dynasty in China. He reigned from 960 until his death in 976, after ousting the last ruler of the Later Zhou dynasty, Emperor Gong, through a coup d'état. Emperor Taizu had a distinguished military career before claiming the throne.

Emperor Wen of Sui: Emperor Wen of Sui, also known as Yang Jian, was the founder and first emperor of the Sui dynasty in China. He played a significant role in reuniting China after a long period of division and encouraged the spread of Buddhism. His reign saw the construction of the Grand Canal, a major engineering feat.

Wu Zetian: Wu Zetian, known as Wu Zhao, was the first and only female emperor in Chinese history. She ruled the Tang dynasty from 665 to 705, initially as an empress consort and later as the empress dowager. Eventually, she established her own Wu Zhou dynasty from 690 to 705. Wu Zetian was a legitimate and widely respected female sovereign, exercising power for 40 years. Under her rule, China expanded, becoming a global power, while experiencing a cultural and economic revival. Notably, she tackled corruption within the court. However, she was overthrown in a coup and passed away shortly after.

Emperor Xuanzong of Tang: Emperor Xuanzong of Tang, also known as Li Longji, was the longest-reigning emperor of the Tang dynasty in China, ruling from 712 to 756 CE. Despite initially inheriting a prosperous empire, his reign marked a turning point as political missteps led to a sharp decline and near collapse. The golden age of the Tang dynasty came to an end with the An Lushan Rebellion, caused by Xuanzong's over-trusting of officials like Li Linfu, Yang Guozhong, and An Lushan.

Yang Guifei: Yang Guifei, also known as Yang Yuhuan, was the cherished consort of Emperor Xuanzong of Tang. During his later years, she was recognized as one of the Four Beauties of ancient China.

Taejo of Goryeo: Taejo of Goryeo, also known as Taejo Wang Kŏn, was the founder and ruler of the Goryeo dynasty in Korea from 918 to 943. He achieved the unification of the Later Three Kingdoms in 936.

Taejo of Joseon: Taejo of Joseon, or Yi Seong-gye, founded the Joseon dynasty in Korea after ousting the Goryeo dynasty in 1392. He ruled as the first king until his abdication six years later, caused by a conflict among his sons. Following the establishment of the Korean Empire, he was revered as Emperor Go.

Genghis Khan: Genghis Khan (1162-1227) was the founder and first ruler of the Mongol Empire, which became the largest contiguous empire ever. He united Mongol tribes and led military campaigns, conquering vast regions in China and Central Asia.

Ögedei Khan: Ögedei Khan, son of Genghis Khan, was the second ruler of the Mongol Empire. He continued his father's mission of expanding the empire during his reign.

Kublai Khan: Kublai Khan, the founder and first emperor of the Yuan dynasty in China, was also known as Emperor Shizu of Yuan and Setsen Khan. He held the position of the fifth khagan-emperor in the Mongol Empire from 1260 to 1294, but this became symbolic after the empire's division. Kublai Khan established the "Great Yuan" dynasty in 1271 and reigned over China until his demise in 1294.

Anawrahta: Anawrahta Minsaw, the founder of the Pagan Empire, transformed a small principality into the first Burmese Empire. He is considered the father of the Burmese nation and his reign laid the foundation for modern-day Burma. He ascended the Pagan throne in 1044, marking the start of historically verifiable Burmese history.

Gajah Mada: Gajah Mada was a military leader in the 14th century Javanese empire of Majapahit. Also known as Jirnnodhara, he is recognized for leading the empire to its highest point of greatness, as noted in ancient Javanese manuscripts, poems, and inscriptions.

Jayavarman VII: Jayavarman VII, posthumously known as Mahaparamasaugata, was a powerful king of the Khmer Empire. He was the first Khmer king devoted to Buddhism and constructed the Bayon as a Buddhist monument. Jayavarman VII implemented a welfare state, constructing hospitals, highways, rest houses, and temples, to cater to the physical and spiritual needs of the Khmer people. He is widely regarded as the most influential Khmer monarch in history.

Ram Khamhaeng: Ram Khamhaeng was the third king of the Sukhothai Kingdom, reigning from 1279 to 1298. He led during the kingdom's most prosperous period and was part of the Phra Ruang Dynasty.

Suryavarman II: Suryavarman II was a Khmer king from 1113 to 1145/1150 AD who built Angkor Wat, the world's largest religious monument dedicated to Hindu god Vishnu. He is regarded as one of the empire's greatest kings due to his notable architectural achievements, military campaigns, and restoration of strong government.

Trần Thánh Tông: Trần Thánh Tông was the second emperor of the Trần dynasty in Vietnam, ruling from 1258 to 1278. He held the title of retired emperor after passing the throne to his son and played a crucial role in repelling Mongol invasions. Considered one of the greatest emperors in Vietnamese history, Thánh Tông brought prosperity and peace to the country through successful governance in military and civil matters.

Prithviraj Chauhan: Prithviraj Chauhan, also known as Prithviraj III or Rai Pithora, was a king from the Chauhan dynasty who ruled over the territory of Sapadalaksha, centered at Ajmer in Rajasthan. He became king at a young age and aimed to expand his kingdom through military campaigns, successfully defeating the Chandelas and ruling over a vast region from Thanesar to Jahazpur.

Harsha: Harsha, a Pushyabhuti emperor, ruled northern India from 606 to 647 CE. He was the son of Prabhakaravardhana, who had defeated Alchon Hun invaders, and the younger brother of Rajyavardhana, the king of Thanesar in present-day Haryana.

Alauddin Khalji: Alauddin Khalji, a ruler from the Khalji dynasty in the Delhi Sultanate of the Indian subcontinent, implemented important administrative changes. These changes included reforms in revenue and price controls, as well as society. He successfully defended against Mongol invasions. Alauddin was the nephew and son-in-law of his predecessor, Jalaluddin. After holding various governorships, he raided Devagiri and used the loot to overthrow Jalaluddin. Alauddin consolidated his power in Delhi and subjugated Jalaluddin's sons in Multan.

Rajaraja I: Rajaraja I, also known as Rajaraja the Great, was a powerful Chola emperor (985-1014 CE) who achieved remarkable conquests in Southern India, Sri Lanka, and expanded Chola influence in the Indian Ocean.

Osman I: Osman I, also known as Osman Ghazi, established the Ottoman Empire. Although initially a small Turkoman principality, it evolved into a formidable global empire after his time. This empire lasted until the aftermath of World War I.

Saladin: Saladin, also known as Salah ad-Din Yusuf ibn Ayyub, was a Kurdish leader who founded the Ayyubid dynasty. He became the first sultan of Egypt and Syria and played a crucial role in the Third Crusade. As a Muslim military commander, he led the fight against the Crusader states in the Levant. At the peak of his power, the Ayyubid empire covered vast territories including Egypt, Syria, Upper Mesopotamia, the Hejaz, Yemen, and Nubia.

Abu Bakr: Abu Bakr was a senior companion of the Islamic prophet Muhammad and the first Caliph of the Rashidun Caliphate. He held the honorific title al-Siddiq by Sunni Muslims and was also the father-in-law of Muhammad through his daughter Aisha.

Umar: Umar ibn al-Khattab was the second Rashidun caliph from August 634 until his assassination in 644. He succeeded Abu Bakr and was known for his just nature. Umar was a senior companion and father-in-law of Muhammad, and he held the title Amir al-Mu'minin, being the first to receive this title.

Uthman: Uthman ibn Affan was the third Rashidun caliph and a prominent companion of Muhammad. He ruled from 644 until his assassination in 656. During his caliphate, he ordered the compilation of the standardized version of the Quran that is still used today.

Mu'awiya I: Mu'awiya I was the first caliph of the Umayyad Caliphate, ruling from 661 to his death. He was not an early companion of Prophet Muhammad, unlike his predecessors.

Abd al-Malik ibn Marwan: Abd al-Malik ibn Marwan was the fifth Umayyad caliph (685-705). He was born in Medina and held important positions under his father and caliph Mu'awiya I. Abd al-Malik restored Umayyad authority in Syria and Egypt after a period of collapse due to the Second Fitna.

Harun al-Rashid: Harun al-Rashid, also known as Abu Ja'far Harun ibn al-Mahdi, was the fifth Abbasid caliph of the Abbasid Caliphate from 786 to 809. His reign marked the start of the Islamic Golden Age. He was called al-Rashid, meaning "the Orthodox" or "the Just."

Alfred the Great: Alfred the Great was King of the West Saxons and the Anglo-Saxons from 871 to 899. He implemented significant administrative and military reforms, leading to lasting changes in England.

Æthelstan: Æthelstan: King of the Anglo-Saxons (924-927) and King of the English (927-939). Considered the first King of England and one of the greatest Anglo-Saxon kings. Son of King Edward the Elder, he had no children and was succeeded by his half-brother, Edmund I.

William the Conqueror: William the Conqueror, also known as William the Bastard, was the first Norman king of England from 1066 to 1087. He was initially the Duke of Normandy and established his throne in 1060 after a challenging struggle. In 1066, he invaded England, defeating Harold Godwinson at the Battle of Hastings, which led to the Norman Conquest. Throughout his reign, he faced numerous challenges, including English revolts, and struggled to maintain control over both England and his continental lands. He also had difficulties with his eldest son, Robert Curthose.

Henry II of England: Henry II of England ruled from 1154 until his death in 1189. He held control over England, Wales, Ireland, and a significant portion of France, known as the Angevin Empire. Additionally, he exerted influence over Scotland and the Duchy of Brittany.

Richard I of England: Richard I of England, also known as Richard the Lionheart, ruled as King of England from 1189 until his death in 1199. He held various titles and territories, including Duke of Normandy, Aquitaine, and Gascony, Lord of Cyprus, and Count of Poitiers, Anjou, Maine, and Nantes. Richard was recognized for his exceptional military leadership and prowess, earning him the nickname "Cœur de Lion." He was the third son of Henry II of England and Eleanor of Aquitaine and ascended to the throne after his two elder brothers passed away. Richard's reputation for terseness earned him the nickname "Richard Oc-e-Non" by the troubadour Bertran de Born.

John, King of England: Summary: John, King of England (1199-1216), suffered losses of his French territories to King Philip II, which led to the collapse of the Angevin Empire and the rise of the Capetian dynasty. The baronial revolt during his reign resulted in the creation of Magna Carta, an influential document in the development of the UK's constitution.

Edward I of England: Edward I of England, also known as Edward Longshanks and the Hammer of the Scots, ruled England from 1272 to 1307. He was involved in political intrigues from an early age and supported a reform movement in 1259. Edward was held hostage during the Second Barons' War but escaped and defeated the baronial leader in 1265. He joined the Ninth Crusade to the Holy Land in 1270 and was crowned upon returning to England in 1274.

Edward III of England: Edward III of England was King of England from 1327 until his death in 1377. He restored royal authority after his father’s troubled reign and transformed England into a powerful military force in Europe. His long reign saw important developments in legislation and government, including the evolution of the English Parliament. Edward III also faced challenges like the Black Death and outlived his eldest son, passing the throne to his grandson.

Robert the Bruce: Robert the Bruce, or Robert I, was the Scottish King from 1306 to 1329. He led Scotland in the First War of Scottish Independence, fighting to regain independence from England. His reign was dedicated to restoring Scotland as a sovereign kingdom, making him a revered national hero in Scotland.

Charlemagne: Charlemagne, King of the Franks and Lombards, became Emperor in 800. He united much of Western and Central Europe and was the first recognized ruler post the fall of the Western Roman Empire. His rule brought lasting political and societal changes, shaping the Middle Ages in Europe.

Charles Martel: Charles Martel, known as "The Hammer," was a Frankish leader who effectively ruled over the Franks from 718 until his death. He restored centralized government and reclaimed Gaul through successful military campaigns. Charles was recognized for his exceptional skills in battle.

Clovis I: Clovis I was the initial king of the Franks who successfully unified all the Frankish tribes under one ruler, transforming the leadership from numerous petty kings to a lone monarch. He established the influential Merovingian dynasty, which governed the Frankish kingdom for 200 years. As "the first king of what would become France," Clovis plays a significant role in French historiography.

Eleanor of Aquitaine: Eleanor of Aquitaine was a powerful and wealthy woman in the High Middle Ages. She was Duchess of Aquitaine and Queen of France and England through her marriages to King Louis VII and King Henry II respectively. She played significant roles in the Second Crusade and a revolt in support of her son. Eleanor also supported and patronized poets and the arts during this era.

Louis the Pious: Louis the Pious, also known as Louis I, was a Frankish king and co-emperor with his father Charlemagne. He ruled as the sole ruler of the Franks after his father's death in 814. However, he was deposed briefly from 833 to 834. He was also the King of Aquitaine and known for being fair and debonair.

Philip II of France: Philip II of France, also known as Philip Augustus, reigned from 1180 to 1223. He was the first French monarch to style himself "King of France" and expanded the crown lands significantly, earning the epithet "Augustus".

Louis IX of France: Louis IX, also known as Saint Louis, was the King of France from 1226 to 1270. He was the most distinguished ruler of the Direct Capetians and was crowned at the age of 12. His mother, Blanche of Castile, acted as his regent and adviser. Blanche successfully dealt with rebellious vassals and supported the Capetian cause in the Albigensian Crusade.

Philip IV of France: Philip IV of France, also known as Philip the Fair, ruled France from 1285 to 1314. He became King of Navarre in 1284 through marriage and was also the Count of Champagne. Nicknamed "the Iron King," Philip was known for his inflexible and imposing personality, despite being called "the Bel" due to his handsome appearance. His fierce opponent, Bishop Bernard Saisset, described him as neither human nor animal, but a statue.

Charles the Fat: Charles the Fat, a member of the Carolingian dynasty, was the emperor of the Carolingian Empire from 881 to 887. He was the youngest son of Louis the German and Hemma and a great-grandson of Charlemagne. Notably, he was the last Carolingian emperor born into the dynasty and the final ruler to govern a united kingdom of the Franks.

Henry the Lion: Henry the Lion was a prominent member of the Welf dynasty, known as Henry III, Duke of Saxony and Henry XII, Duke of Bavaria.

Otto the Great: Otto the Great, also known as Otto I, was the East Frankish king from 936 and Holy Roman Emperor from 962 until 973. He was the eldest son of Henry the Fowler and Matilda of Ringelheim.

Henry IV, Holy Roman Emperor: Henry IV was Holy Roman Emperor from 1084 to 1105. He was also King of Germany from 1054 to 1105 and King of Italy and Burgundy from 1056 to 1105. He was the son of Henry III, Holy Roman Emperor, and Agnes of Poitou. Under the guardianship of his mother after his father's death, Henry faced challenges with the Church and was kidnapped by Archbishop Anno II of Cologne. Archbishop Anno II administered Germany until Henry reached adulthood in 1065.

Frederick Barbarossa: Frederick Barbarossa, also known as Frederick I, was the Holy Roman Emperor from 1155 until his death in 1190. He was crowned King of Germany in 1152 and King of Italy in 1155. He was named Barbarossa due to his red beard and his attempts to rule northern Italian cities. His Italian campaigns played a central role in his career.

Frederick II, Holy Roman Emperor: Summary: Frederick II, Holy Roman Emperor, was a powerful ruler who held various titles including King of Sicily, Germany, Italy, and Jerusalem during the 12th and 13th centuries. He was born and raised within the influential Hohenstaufen dynasty and was the son of Emperor Henry VI and Queen Constance of Sicily.

Charles IV, Holy Roman Emperor: Charles IV, also called Charles of Luxembourg, was the first Bohemian King to become Holy Roman Emperor. He belonged to the House of Luxembourg and the Bohemian House of Přemyslid. Charles's love for his Bohemian heritage and his Přemyslid ancestry, which included two saints, greatly influenced his rule.

Sigismund, Holy Roman Emperor: Sigismund was a ruler who held various titles including King of Hungary, Croatia, Germany, and Bohemia. He also served as the Holy Roman Emperor from 1433 until his death in 1437. Additionally, he was a prince-elector of Brandenburg and the last male member of the House of Luxembourg.

Robert Guiscard: Robert Guiscard, a Norman adventurer in the 11th century, conquered southern Italy and Sicily. He is known as "the Guiscard" for his successful military campaigns in the region.

Roger II of Sicily: Roger II of Sicily, also known as Roger the Great, was a powerful ruler who became the King of Sicily and Africa. He started as the Count of Sicily in 1105, later becoming the Duke of Apulia and Calabria in 1127. Finally, in 1130, he ascended to the throne as the King of Sicily and in 1148, he became the King of Africa.

Theodoric the Great: Theodoric the Great, king of the Ostrogoths, ruled over the independent Ostrogothic Kingdom of Italy from 493 to 526. He also served as the regent of the Visigoths and held the title of patrician in the Eastern Roman Empire. Controlling territories from the Atlantic Ocean to the Adriatic Sea, Theodoric is sometimes considered a Western Roman Emperor due to his immense power and acquisition of imperial regalia.

Pope Gregory VII: Pope Gregory VII, also known as Hildebrand of Sovana, led the Catholic Church and governed the Papal States from 1073 until 1085. He is revered as a saint in the Catholic Church.

Pope Urban II: Pope Urban II, also known as Odo of Châtillon or Otho de Lagery, led the Catholic Church and ruled the Papal States from 1088 until his death. His most significant achievement was gathering the Council of Clermont, which sparked the Crusades - a series of Christian military expeditions.

Pope Innocent III: Pope Innocent III (Lotario dei Conti di Segni) led the Catholic Church and governed the Papal States from 1198 to 1216.

Pope Boniface VIII: Pope Boniface VIII (1294-1303) was the Catholic Church leader and ruler of the Papal States. He came from the influential Caetani family with ties to the papacy. Boniface followed Pope Celestine V and started his career in diplomacy.

Cnut: Cnut the Great, also known as Canute, ruled as King of England, Denmark, and Norway from 1016 until his death in 1035. His reign united these three kingdoms, forming the North Sea Empire.

Margaret I of Denmark: Margaret I of Denmark was a queen regnant who ruled Denmark, Norway, and Sweden in the late 1380s until her death. She founded the Kalmar Union, which unified the Scandinavian kingdoms for over a century. Margaret was admired for her wise and capable leadership, earning the nickname "Semiramis of the North". Despite derogatory nicknames, she was recognized by her subjects as a skilled ruler, known as "Lady King". Margaret is considered the first great ruling queen in European history.

Abd al-Rahman I: Abd al-Rahman I, founder of the Umayyad dynasty, ruled Al-Andalus in Iberia for nearly 3 centuries. He broke away from the Abbasids, who had overthrown the Umayyads in Damascus in 750, and established a new Umayyad government in Iberia.

Abd al-Rahman III: Abd al-Rahman III, also known as al-Nasir li-Din Allah, was the Umayyad Emir of Cordoba from 912 to 929. He then established the Caliphate of Cordoba and became its first caliph until his death. He gained the title al-Nasir li-Din Allah for supporting Berbers against Fatimid expansion and later declared himself caliph. His 50-year rule was marked by religious tolerance.

Afonso I of Portugal: Afonso I of Portugal, also known as Afonso Henriques, was the first king of Portugal. He gained independence for the County of Portugal and expanded its territory through the Reconquista until his death. He is renowned as the Conqueror and the Founder.

Stefan Dušan: Stefan Dušan, also known as Dušan the Mighty, ruled as the king of Serbia starting from September 1331. He became the tsar and autocrat of the Serbs, Greeks, Albanians, and Bulgarians in April 1346, maintaining his authority until his demise in 1355.

Stephen the Great: Stephen III, also known as Stephen the Great, was the Voivode of Moldavia from 1457 to 1504. After his father's murder, he was forced to flee but later returned with help, dethroning his uncle. Stephen was anointed prince by the Metropolitan of Moldavia and successfully defended his kingdom against Poland, ultimately acknowledging their suzerainty in 1459.

Svatopluk I of Moravia: Svatopluk I, known as Svatopluk the Great, ruled Great Moravia and led it to its largest territorial expansion.

Vlad the Impaler: Vlad the Impaler, also known as Vlad III or Vlad Dracula, ruled Wallachia three times from 1448 until his death in 1476/77. He is highly regarded as a significant leader in Wallachian history and a revered national hero of Romania.

Krum: Krum, also known as Krum the Fearsome, was the Khan of Bulgaria from 796 to 814. Under his reign, Bulgaria's territory expanded significantly, reaching from the middle Danube to the Dnieper and from Odrin to the Tatra Mountains. Krum's effective leadership brought stability and structure to Bulgaria, establishing the foundations of a functioning state.

Boris I of Bulgaria: Boris I of Bulgaria (852-889) was a skilled ruler of the First Bulgarian Empire. He is regarded as one of the greatest figures in history. Boris I achieved significant events that shaped Bulgarian and European history. In 864, he Christianized Bulgaria, abolishing paganism. He also skillfully utilized conflicts between the Patriarchate of Constantinople and the Papacy to establish an independent Bulgarian Church, ensuring protection against Byzantine interference.

Ivan Asen II: Ivan Asen II, also known as John Asen II, was Emperor of Bulgaria from 1218 to 1241. He became emperor as a child after his father's assassination and later fled to Rus' principalities.

Justinian I: Justinian I, also known as Justinian the Great, ruled as Eastern Roman emperor from 527 to 565.

Theodora (wife of Justinian I): Theodora, wife of Justinian I, was a Byzantine empress with humble origins. She became empress in 527 and was a chief adviser to her husband. Notably, Theodora is recognized as a saint by the Eastern Orthodox Church and the Oriental Orthodox Church, honored on 28 June.

Heraclius: Heraclius, Byzantine emperor from 610 to 641, came to power through a revolt in 608 with his father, Heraclius the Elder, against the disliked usurper Phocas.

Leo III the Isaurian: Leo III the Isaurian, Byzantine Emperor from 717 to 741, ended the Twenty Years' Anarchy and founded the Isaurian dynasty. He defended the Empire against the Umayyads and prohibited the worship of icons.

Basil II: Basil II, known as the Bulgar Slayer, was a Byzantine emperor from 976 to 1025. He became co-emperor with his brother following their father's death, but they were too young to rule. Basil eventually became the senior emperor, though his great-uncle remained the de facto ruler until 985. His reign of 49 years and 11 months was the longest ever for a Roman emperor.

Manuel I Komnenos: Manuel I Komnenos, also known as Porphyrogennetos and Latinized as Comnenus, was a 12th-century emperor who presided over a pivotal era for the Byzantine Empire and the Mediterranean. His reign marked the final period of the Komnenian restoration, characterized by a revitalized military, economic strength, and a cultural renaissance.

Stephen I of Hungary: Stephen I of Hungary, also known as King Saint Stephen, was the last Grand Prince of the Hungarians and the first King of Hungary. He ruled from 997/1000 until his death in 1038. Stephen was born around 975 in Esztergom and was baptized as a Christian. He was the son of Grand Prince Géza and Sarolt, and he married Gisela of Bavaria from the Ottonian dynasty.

Béla IV of Hungary: Béla IV of Hungary was the King of Hungary and Croatia from 1235 to 1270 and the Duke of Styria from 1254 to 1258. Despite opposition from his father, he was crowned in 1214 and appointed Duke of Slavonia in 1220. He married Maria, daughter of Emperor Theodore I Laskaris, and governed Transylvania from 1226. Béla supported Christian missions and gained the title of King of Cumania in 1233. He sought to regain royal authority by reclaiming former royal estates, causing discontent among the nobles and prelates.

Louis I of Hungary: Louis I of Hungary, also known as Louis the Great or Louis the Hungarian, was the King of Hungary and Croatia from 1342 and the King of Poland from 1370. He was the first surviving child of Charles I of Hungary and Elizabeth of Poland. A treaty in 1338 confirmed his right to inherit the Polish kingdom if his uncle died without a son, with the condition that he assist in reclaiming lost Polish lands. He also held the title of Duke of Transylvania briefly.

Bolesław I the Brave: Bolesław I the Brave, also known as Bolesław the Great, was a Duke of Poland and the first King of Poland. He expanded his rule over Bohemia briefly, and was a skilled mediator in Central European affairs. Bolesław promoted Western Christianity, and elevated Poland to a kingdom, becoming the first Polish ruler to be titled as king.

Casimir III the Great: Casimir III the Great was the King of Poland from 1333 to 1370. He also became King of Ruthenia and fought to maintain his title during the Galicia-Volhynia Wars. He was the final king of Poland from the Piast dynasty.

Gediminas: Gediminas, ruler of Lithuania from approximately 1315-1341, held the title of Grand Duke.

Mieszko I: Mieszko I, the first ruler of Poland, founded the independent Polish state known as the Duchy of Poland. He reigned from 960 until his death and was a member of the Piast dynasty. Mieszko I was the father of Bolesław I the Brave and Gunhild of Wenden. He is considered the ancestor of Sigrid the Haughty, Canute the Great, and Gunhilda of Denmark, who became the wife of Henry III, Holy Roman Emperor.

Vytautas: Vytautas, or Vytautas the Great, was a ruler of the Grand Duchy of Lithuania in the late 14th century. He held titles as prince of Grodno and Lutsk and had aspirations of becoming the king of the Hussites.

Władysław II Jagiełło: Władysław II Jagiełło, also known as Jogaila, was the Grand Duke of Lithuania who became the King of Poland in 1386. He converted to Catholicism, married Queen Jadwiga, and played a significant role in establishing the Polish–Lithuanian union. His reign lasted for 35 years, and he belonged to the influential Jagiellonian dynasty. The dynasty ruled both Poland and Lithuania until 1572, leaving a lasting impact on medieval and early modern Europe.

Alexander Nevsky: Alexander Yaroslavich Nevsky, a Russian prince, held positions as the Prince of Novgorod, Grand Prince of Kiev, and Grand Prince of Vladimir during the 13th century.

Daniel of Galicia: Daniel of Galicia, also known as Danylo Romanovych, was a 13th-century ruler who held important titles including King of Ruthenia, Prince of Galicia, Peremyshl, and Volodymyr. In 1253, he became the first King of Ruthenia after being crowned by a papal archbishop in Dorohochyn.

Dmitry Donskoy: Dmitry Donskoy, a Russian prince, ruled Moscow and later Vladimir from 1359 until his death in the 14th century. He succeeded his father, Ivan II.

Sviatoslav I: Sviatoslav I was the Prince of Kiev from 945 to 972. He waged successful campaigns in the east and south, leading to the downfall of Khazaria and the First Bulgarian Empire. Sviatoslav conquered various East Slavic tribes, defeated the Alans, and launched attacks on the Volga Bulgars. Additionally, he formed alliances with the Pechenegs and Magyars (Hungarians).

Vladimir the Great: Vladimir I Sviatoslavich, known as Vladimir the Great, was a leader in Novgorod and Kiev from 970 to 1015. He was later canonized as Saint Vladimir by the Eastern Orthodox Church.

Yaroslav the Wise: Yaroslav the Wise, or Yaroslav I Vladimirovich (1019-1054), was a prominent ruler in medieval Eastern Europe. He held various titles, including Grand Prince of Kiev, Prince of Novgorod, and Prince of Rostov. Yaroslav's leadership saw the temporary unification of these principalities. His baptismal name was George, inspired by Saint George.

Ahmad ibn Ibrahim al-Ghazi: Ahmad ibn Ibrahim al-Ghazi, also known as the "King of Zeila," was the Imam of the Adal Sultanate from 1527 to 1543. He successfully led the Sultanate in conquering the Ethiopian Empire during the Ethiopian-Adal War.

Ahmad al-Mansur: Ahmad al-Mansur, the Saadi Sultan of Morocco from 1578-1603, was a prominent figure in the 16th century in both Europe and Africa. With a formidable army and strategic location, he held significant influence during the late Renaissance. Known for his Islamic knowledge, love for books and scholarly discussions, al-Mansur was also skilled in calligraphy, mathematics, and was fond of mystical texts.

Askia Muhammad I: Askia Muhammad I (1443–1538), also known as Askia the Great, was the first ruler of the Askia dynasty of the Songhai Empire. He expanded his empire, making it the largest in West Africa's history, which included the Hausa states and territories that were previously part of the Songhai empire. Askia Muhammad's reign led to increased trade with Europe and Asia, the establishment of Islam, the creation of schools, and the consolidation of his empire's power.

Nzinga of Ndongo and Matamba: Nzinga of Ndongo and Matamba was a powerful queen who ruled over the Ambundu Kingdoms of Ndongo and Matamba in present-day northern Angola (1624-1663). Born into the ruling family of Ndongo, she became queen after her father's reign came to an end. Known for her strategic intelligence and leadership skills, Nzinga successfully defended her kingdoms against Portuguese colonization and slavery. She is remembered for her resistance against European dominance and her efforts to unite various African tribes against the colonizers.

Zara Yaqob: Zara Yaqob, also known as Emperor Kwestantinos I, was a ruler of Ethiopia from the Solomonic dynasty. During his 34-year reign, he promoted Ge'ez literature and effectively handled internal Christian affairs and external conflicts with Muslims. He established Debre Birhan as his capital.

Tecumseh: Tecumseh, a Shawnee chief and warrior, opposed US expansion onto Native American lands. He traveled extensively, uniting Native American tribes and advocating intertribal unity. Sadly, his efforts ended with his death in the War of 1812. Nonetheless, Tecumseh became an iconic and revered figure in American, Indigenous, and Canadian history.

La Malinche: La Malinche, a Nahua woman from Mexico, played a significant role in the Spanish conquest of the Aztec Empire. She served as an interpreter, advisor, and intermediary for the Spanish conquistador Hernán Cortés. Given to the Spaniards as a slave, she became Cortés' consort and mothered his first son, Martín - one of the earliest Mestizos in New Spain.

Moctezuma I: Moctezuma I, also known as Moteuczomatzin Ilhuicamina or Montezuma I, was the second Aztec emperor and fifth king of Tenochtitlan. He consolidated and expanded the Aztec Empire, which thrived until the Spanish arrival. Moctezuma I ruled from 1440 to 1453, bringing social, economic, and political reforms to strengthen Aztec rule. Tenochtitlan benefited from its relations with other cities during his reign.

Moctezuma II: Moctezuma II, also known as Motecuhzoma Xocoyotzin, was the ninth Emperor of the Aztec Empire from 1502/1503 to 1520. He had multiple variant spellings of his name and was referred to as Moctezuma II by European sources. He was married to Queen Tlapalizquixochtzin of Ecatepec, making him the king consort of that altepetl.

Toussaint Louverture: Toussaint Louverture, also known as Toussaint L'Ouverture or Toussaint Bréda, was a Haitian general and the most prominent leader of the Haitian Revolution. He fought against Spanish and Royalist forces, joined with Republican France, and fought against Napoleon Bonaparte's Empire. Louverture's military and political skills transformed a slave rebellion into a revolutionary movement, earning him the title "Father of Haiti".

Atahualpa: Atahualpa, the last Incan emperor, was captured and executed by the Spanish conquistadors during their conquest of the Inca Empire.

Pachacuti: Pachacuti Inca Yupanqui, known as Pachacutec, was the ninth ruler of the Kingdom of Cusco, who transformed it into the Inca Empire. Today, it is believed that Machu Picchu was built as Pachacuti's personal estate.

Túpac Amaru: Túpac Amaru, the last Sapa Inca of the Neo-Inca State, was executed by the Spanish after their months-long pursuit when the Neo-Inca State crumbled, ultimately ending the Inca Empire's independence.

Túpac Amaru II: Túpac Amaru II, also known as José Gabriel Condorcanqui, was an indigenous leader who led a major rebellion against the Spanish in Peru. He proclaimed himself as the Sapa Inca of a new Inca Empire, inspiring the Peruvian struggle for independence and indigenous rights. His legacy extended beyond Peru, becoming an inspiration for various causes throughout Spanish America and beyond.

George Washington: George Washington, an American Founding Father and military officer, was the first president of the United States. He led the Continental Army to victory in the Revolutionary War and played a crucial role in shaping the Constitution of the United States as president of the Constitutional Convention. Washington is widely known as the "Father of the Nation."

John Adams: John Adams, a prominent American statesman and Founding Father, served as the second president of the United States. He played a key role in achieving independence from Great Britain during the American Revolution. Adams also served as a senior diplomat in Europe during the Revolutionary War and the early years of the new nation. He was the first vice president of the United States and maintained regular correspondence with influential figures like his wife Abigail Adams and his political rival Thomas Jefferson.

Thomas Jefferson: Thomas Jefferson was a prominent American statesman, Founding Father, and the third president of the United States. He played a significant role in drafting the Declaration of Independence and served as the first U.S. secretary of state under George Washington. Prior to becoming president, Jefferson also served as the nation's second vice president under John Adams. He possessed a diverse range of skills as a diplomat, lawyer, architect, and philosopher.

James Madison: James Madison, the fourth US President, was a distinguished statesman and Founding Father. He earned the title "Father of the Constitution" for his crucial contribution to drafting and endorsing the US Constitution and Bill of Rights.

Benjamin Franklin: Benjamin Franklin, a Founding Father of the United States, was an influential polymath who excelled in various fields such as writing, science, invention, diplomacy, and printing. He played a crucial role in drafting and signing the Declaration of Independence, and served as the first postmaster general.

Alexander Hamilton: Alexander Hamilton was a Founding Father, military officer, and statesman who served as the first secretary of the treasury from 1789 to 1795 under George Washington.

Abbas the Great: Abbas the Great, the fifth shah of Safavid Iran (1588-1629), is hailed as one of Iran's greatest rulers and a prominent figure in the Safavid dynasty. He is the son of Shah Mohammad Khodabanda.

Ahmad Shah Durrani: Ahmad Shah Durrani, also known as Ahmad Shah Abdali, founded the Durrani Empire and is considered the founder of modern Afghanistan. He was appointed King by a loya jirga in Kandahar in 1747. Supported by Pashtun tribes, he expanded his control towards the Mughal and Maratha Empires, the disintegrating Afsharid Empire, and the Khanate of Bukhara. Within a few years, he extended his rule from Khorasan to North India and from the Amu Darya to the Arabian Sea.

Babur: Babur, descendant of Timur and Genghis Khan, founded the Mughal Empire in India. Known as Firdaws Makani after his death.

Humayun: Humayun was the second Mughal emperor who ruled over a vast territory including Eastern Afghanistan, Bangladesh, Northern India, and Pakistan. His reign lasted from 1530 to 1540 and again from 1555 until his death in 1556. By the end of his rule, the Mughal Empire had expanded to almost one million square kilometres.

Ismail I: Ismail I was the first shah of Safavid Iran, ruling from 1501 to 1524. His reign marked the beginning of modern Iranian history and the rise of gunpowder empires. Before his rule, Iran had not been unified under native Iranian leadership since the Arab conquest nearly 850 years earlier. Only the Buyids had briefly restored Iranian rule from 945 to 1055.

Nader Shah: Nader Shah Afshar, founder of Iran's Afsharid dynasty, was a powerful ruler from 1736 to 1747. Known as a military genius, he fought battles across the Middle East, Caucasus, Central Asia, and South Asia before being assassinated during a rebellion. He is sometimes compared to Napoleon and Alexander the Great. Nader belonged to the Turkoman Afshars, who played a role in establishing the Safavid dynasty's power in Iran.

Ulugh Beg: Ulugh Beg, a Timurid sultan known as Mīrzā Muhammad Tāraghay bin Shāhrukh, was a renowned astronomer and mathematician.

Jeongjo of Joseon: Jeongjo of Joseon, also known as Yi San or Jeongjo the Great, was the 22nd ruler of the Joseon dynasty in Korea. He aimed to bring reforms and advancements to the nation after ascending to the throne following his grandfather, King Yeongjo.

Seonjo of Joseon: Seonjo of Joseon was the 14th king of the Joseon dynasty of Korea from 1567 to 1608. He promoted Confucianism and reformed the government at the start of his rule. However, he became infamous for his ineffective leadership and political conflict during the Japanese invasions.

Sejong the Great: Sejong the Great, fourth king of the Joseon dynasty in Korea (1418-1450), is revered as one of the greatest rulers in Korean history. He is known for inventing Hangul, the native alphabet of the Korean language.

Hong Taiji: Hong Taiji, also known as Huang Taiji, was the second khan of the Later Jin dynasty and the founder of the Qing dynasty. He consolidated his father's empire and prepared for the conquest of the Ming dynasty. He changed the name of the Jurchen ethnicity to "Manchu" and renamed his dynasty from "Great Jin" to "Great Qing". The Qing dynasty lasted from 1636 to 1912.

Jiajing Emperor: The Jiajing Emperor was the 12th emperor of the Ming dynasty, ruling from 1521 to 1567. He was the cousin of the former Zhengde Emperor. His father was the Prince of Xing, and his era name was "Jiajing," meaning "admirable tranquility."

Kangxi Emperor: The Kangxi Emperor, or Emperor Shengzu of Qing, was the third emperor of the Qing dynasty. He ruled China from 1661 to 1722 and was the second Qing emperor to govern China proper.

Nurhaci: Nurhaci was the first ruler of the Later Jin dynasty in China, reigning from 1616 to 1626. He is also referred to as Emperor Taizu of Qing, and he played a significant role in founding the Jurchen dynasty.

Qianlong Emperor: The Qianlong Emperor was the fifth emperor of the Qing Dynasty in China, ruling from 1735 to 1796. He abdicated in favor of his son out of respect for his grandfather, the longest-reigning emperor. Despite retirement, he retained ultimate power until his death in 1799. He is known for being one of the longest-reigning and longest-lived monarchs in history. The Tibetan peoples gave him the deified title of "Emperor Manjushri".

Wanli Emperor: The Wanli Emperor, also known as Emperor Shenzong, was the 14th ruler of the Ming dynasty, reigning from 1572 to 1620. His reign lasted 48 years, the longest among all Ming emperors. Initially successful, his rule saw the decline of the dynasty due to his withdrawal from government responsibilities around 1600.

Yongle Emperor: The Yongle Emperor, also known as Zhu Di, ruled the Ming dynasty from 1402 to 1424. He was the third emperor and played a significant role during his reign.

Oda Nobunaga: Oda Nobunaga was a prominent Japanese daimyō during the Sengoku period, known as the first "Great Unifier" of Japan and the Tenka-bito.

Toyotomi Hideyoshi: Toyotomi Hideyoshi, also known as Kinoshita Tōkichirō and Hashiba Hideyoshi, was a renowned Japanese samurai and daimyō in the late Sengoku period. He is praised as the second "Great Unifier" of Japan for his vital role in uniting the country.

Tokugawa Ieyasu: Tokugawa Ieyasu was the founder and first shōgun of the Tokugawa Shogunate of Japan, ruling from 1603 to 1868. He was instrumental in the unification of Japan, along with Oda Nobunaga and Toyotomi Hideyoshi. Initially a hostage, Ieyasu became a daimyo and allied with the Oda clan, gradually building his power under Oda Nobunaga's leadership.

Akbar: Akbar, also known as Akbar the Great, was the third Mughal emperor who ruled from 1556 to 1605. He succeeded his father, Humayun, and with the aid of his regent, Bairam Khan, he expanded and consolidated Mughal territories in the Indian subcontinent.

Aurangzeb: Aurangzeb, also known as Alamgir I, was the sixth Mughal emperor from 1658 to 1707. His reign witnessed the Mughal Empire's expansion to encompass most of the Indian subcontinent.

Robert Clive: Robert Clive, also known as Clive of India, was the first British Governor of the Bengal Presidency. He played a significant role in establishing the British East India Company's rule in Bengal by winning the Battle of Plassey in 1757. In exchange for his support, Clive received a yearly jagir of £30,000 from the Nawab. Upon leaving India, he had amassed a fortune of £180,000 which he sent back through the Dutch East India Company.

Hyder Ali: Hyder Ali, Sultan and de facto ruler of the Kingdom of Mysore in southern India, began as a soldier and caught the attention of Mysore's rulers. He rose to become commander-in-chief and effectively controlled both the monarch and the government. By 1761, he had become the de facto ruler of Mysore. Hyder Ali played a crucial military role in the intermittent conflicts against the East India Company during the First and Second Anglo–Mysore Wars.

Krishnadevaraya: Krishnadevaraya, emperor of the Vijayanagara Empire (1509-1529), is regarded as one of India's greatest rulers. He led the largest Indian empire post the Islamic Delhi Sultanate's fall and defeated several powerful sultans, establishing Hindu dominance. Krishnadevaraya ruled at the empire's zenith and is considered an icon in Indian history.

Shah Jahan: Shah Jahan was the fifth Mughal Emperor, reigning from 1628-1658. His rule marked the pinnacle of Mughal architectural and cultural accomplishments.

Prithvi Narayan Shah: Prithvi Narayan Shah (1723-1775) was the final ruler of the Gorkha Kingdom and the founding monarch of Nepal. He initiated the unification process of Nepal.

Shivaji: Shivaji, an Indian ruler and member of the Bhonsle Maratha clan, established his own kingdom from the declining Adilshahi Sultanate of Bijapur. This eventually led to the formation of the Maratha Empire. In 1674, he was officially crowned the Chhatrapati of his realm at Raigad Fort.

Sher Shah Suri: Sher Shah Suri, known as the "Just King", founded the Sur Empire in India by defeating the Mughal Empire in 1540. He ruled Bihar from 1529—1540 and became the emperor of Delhi. His reign saw significant innovations and reforms, and he was acclaimed as an exceptional Afghan general, remaining undefeated in battle. After his accidental death, his son Islam Shah succeeded him.

Tipu Sultan: Tipu Sultan, also known as Sher-e-Mysore or "Tiger of Mysore," was an Indian Muslim ruler in South India. He introduced administrative changes, including a new coinage and calendar, and initiated the growth of the Mysore silk industry. Tipu pioneered rocket artillery and expanded iron-cased Mysorean rockets. He deployed these rockets during the Anglo-Mysore Wars against British forces, such as in the Battle of Pollilur and Siege of Srirangapatna. He also introduced Channapatna toys and commissioned the military manual Fathul Mujahidin.

Sultan Agung of Mataram: Sultan Agung of Mataram, also known as Sultan Anyakrakusuma, was the powerful third Sultan of Mataram in Central Java from 1613 to 1645. He was a skilled military leader, successfully annexing neighboring states and strengthening his kingdom to its greatest territorial and military supremacy.

Rama I: Rama I, also known as Phra Phutthayotfa Chulalok, founded the Rattanakosin Kingdom and the Chakri dynasty in Siam. He became the first monarch in 1782 after the removal of King Taksin of Thonburi. Rama I is recognized for establishing Rattanakosin as the capital of the reunited kingdom.

Iskandar Muda: Iskandar Muda was the twelfth Sultan of Aceh Darussalam, known for expanding the territory of the sultanate and making it a powerful and wealthy state in the western Indonesian archipelago and the Strait of Malacca. He was compared to Alexander the Great for his conquests. During his reign, Aceh became a center of Islamic learning and trade. Iskandar Muda's death marked the end of the founding dynasty of the Aceh Sultanate.

Naresuan: Naresuan, the 18th monarch of Ayutthaya Kingdom and 2nd monarch of the Sukhothai dynasty, reigned from 1590 to 1605. He freed Ayutthaya from the Taungoo Empire and fought multiple wars against Taungoo Burma. Naresuan is highly respected in Thailand and welcomed the Dutch during his reign.

Alaungpaya: Alaungpaya was the founder and first emperor of the Konbaung Dynasty in Burma. He united Burma, defeated Manipur and Lan Na, and conquered the Restored Hanthawaddy Kingdom with help from the French and British forces. Additionally, he expanded settlements in Dagon and renamed the town Yangon.

Bayinnaung: Bayinnaung Kyawhtin Nawrahta was the king of the Toungoo Dynasty of Myanmar from 1550 to 1581. He had a 31-year reign characterized by his ability to amass a vast and possibly the biggest empire in Southeast Asian history. His empire extended over modern-day Myanmar, the Chinese Shan states, Lan Na, Lan Xang, Manipur, and Siam. Bayinnaung's rule is renowned for its remarkable display of human energy, earning him the title of having the "greatest explosion of human energy ever seen in Burma."

Tabinshwehti: Tabinshwehti was a king of Burma from 1530 to 1550, who created the First Toungoo Empire through his successful military campaigns. He established the largest kingdom in Burma since the fall of the Pagan Empire in 1287. However, his kingdom faced administrative challenges, leading to its eventual reunification by his brother-in-law and successor, Bayinnaung.

Lê Lợi: Lê Lợi, aka Lê Thái Tổ, was a Vietnamese rebel leader who founded the Later Lê dynasty and became the first Emperor of Đại Việt. He rebelled against the Ming dynasty's rule and utilized guerrilla tactics to defeat their armies. Lê Lợi's 9-year resistance movement restored Vietnamese independence and he is considered a renowned figure in Vietnamese history.

Lê Thánh Tông: Lê Thánh Tông, also known as Lê Hạo, was an emperor of Đại Việt from 1460 to 1497. He is considered one of the greatest emperors in Vietnamese history. Coming to power through a coup, he was the fifth and longest-reigning emperor of the Later Lê dynasty.

Quang Trung: Quang Trung, also known as Nguyễn Huệ, was the second emperor of the Tây Sơn dynasty in Vietnam from 1788 to 1792. He was a highly successful military commander and led the Tây Sơn rebellion, which conquered Vietnam and overthrew the Later Lê dynasty, as well as the rival houses of Nguyễn and Trịnh.

Roxelana: Roxelana, also called Hürrem Sultan, was the influential wife of Ottoman Sultan Suleiman the Magnificent. She became a powerful and controversial figure during the period known as the Sultanate of Women in Ottoman history.

Mehmed II: Mehmed II, also known as Mehmed the Conqueror, ruled the Ottoman Empire twice. His first reign was from August 1444 to September 1446, and his second from February 1451 to May 1481.

Mehmed IV: Mehmed IV, also called Mehmed the Hunter, ruled the Ottoman Empire from 1648 to 1687. He became sultan at six years old following his father's overthrow. Mehmed had the second-longest reign in Ottoman history, overseeing a period of military defeats and political instability. However, his middle years saw the empire's recovery during the Köprülü era. Known for his piety, Mehmed IV was referred to as a "holy warrior" for his involvement in numerous conquests throughout his reign.

Selim I: Selim I, also known as Selim the Grim or Selim the Resolute, was the Sultan of the Ottoman Empire from 1512 to 1520. During his short reign, he achieved significant territorial expansion, notably conquering the Mamluk Sultanate of Egypt in 1516-1517, which included the Levant, Hejaz, Tihamah, and Egypt itself. Under his leadership, the Ottoman Empire grew by 70% to approximately 3.4 million km2 (1.3 million sq mi).

Selim III: Selim III, an enlightened ruler of the Ottoman Empire from 1789 to 1807, was deposed and imprisoned by the Janissaries. They replaced him with his cousin, Mustafa IV, as the new sultan. Unfortunately, Selim was later assassinated.

Suleiman the Magnificent: Suleiman the Magnificent, also known as Suleiman the Lawgiver, was the longest-reigning sultan of the Ottoman Empire. He ruled from 1520 until his death in 1566 and had a vast empire with over 25 million subjects.

Louis XI: Louis XI, known as "Louis the Prudent," ruled as King of France from 1461 to 1483. He rebelled against his father and was banished from court, but managed the Dauphiné province. Despite opposition from his father, Louis married Charlotte of Savoy. With help from the Duke of Burgundy, he escaped Charles VII's army.

Francis I of France: Francis I of France was the king from 1515 to 1547. He inherited the throne after his father-in-law Louis XII died without a male heir.

Henry IV of France: Henry IV of France, known as Good King Henry or Henry the Great, was the first Bourbon monarch of France. He ruled from 1589 to 1610 and successfully balanced the interests of Catholics and Protestants within France and among European states. Despite his pragmatic approach, he was assassinated by a Catholic zealot in 1610 and was succeeded by his son Louis XIII.

Louis XIV: Louis XIV, also known as Louis the Great or the Sun King, was the King of France from 1643 until his death in 1715. With a reign of 72 years and 110 days, he has the longest rule of any sovereign. He symbolized the Age of Absolutism, but his court was filled with significant figures from politics, military, and culture. Some notable individuals included Bossuet, Colbert, Louvois, Le Brun, Le Nôtre, Lully, Mazarin, Molière, Racine, Turenne, Condé, and Vauban.

Louis XV: Louis XV, also known as Louis the Beloved, was the King of France from 1715 until his death in 1774, succeeding his great-grandfather at the age of five. During his early years, his grand-uncle served as Regent of France. After cardinal Fleury's death in 1743, Louis XV assumed sole control of the kingdom.

Louis XVI: Louis XVI, the final French king, ruled until the monarchy's collapse in the French Revolution.

Napoleon: Napoleon Bonaparte, also known as Napoleon I, was a French emperor and military commander who played a significant role in the French Revolution. He led successful campaigns during the Revolutionary Wars and served as the leader of the French Republic. Later, he became the Emperor of the French, ruling from 1804 to 1814 and briefly in 1815. Napoleon introduced lasting reforms but faced criticism for his authoritarian rule. He is renowned as a brilliant military strategist and his wars and campaigns continue to be analyzed in military schools worldwide. However, historians still debate his responsibility for the Napoleonic Wars, which resulted in the deaths of millions.

Catherine de' Medici: Catherine de' Medici, an Italian noblewoman from the powerful Medici family, became Queen of France through her marriage to King Henry II. She was the mother of three French kings and had significant influence on the political landscape of France during their reigns. This era was later known as "the age of Catherine de' Medici."

Marie Antoinette: Marie Antoinette was the last queen of France before the French Revolution. She was born in Austria and became the dauphine of France at 14 when she married Louis-Auguste. In 1774, her husband became Louis XVI and she became queen.

Cardinal Mazarin: Cardinal Mazarin, born Giulio Mazzarino, was an Italian prelate and diplomat. He served as the chief minister to the French kings Louis XIII and Louis XIV from 1642 until his death. Mazarin acquired the titles Duke of Mayenne, Rethel, and Nevers during his career.

Madame de Pompadour: Madame de Pompadour, or Jeanne Antoinette Poisson, was a prominent French court member. She held the title of chief mistress to King Louis XV from 1745 to 1751 and remained influential as a court favorite until her death.

Cardinal Richelieu: Cardinal Richelieu, or Armand Jean du Plessis, was a French statesman and Catholic prelate. He was dubbed "the Red Eminence" due to his influential position as a cardinal and his customary red robes.

Henry V of England: Henry V of England, also known as Henry of Monmouth, ruled from 1413 until 1422. His exceptional military triumphs during the Hundred Years' War established England as a formidable military force in Europe. Shakespeare's plays further immortalized him, solidifying Henry's reputation as one of medieval England's most esteemed warrior-kings.

Henry VIII: Henry VIII was the King of England who reigned from 1509 until his death in 1547. He is famous for his six marriages and his quest to annul his first marriage. This disagreement with the Pope led Henry to create the Church of England, making himself its leader and resulting in the dissolution of convents and monasteries. His actions led to his excommunication by the Pope.

Mary I of England: Mary I, also known as Mary Tudor, was Queen of England and Ireland from July 1553. She married King Philip II of Spain in January 1556 and remained Queen until her death in 1558. Mary tried to reverse the English Reformation initiated by her father, King Henry VIII. Despite Parliament's resistance, she burned over 280 religious dissenters at the stake during her five-year reign, earning the nickname "Bloody Mary."

Elizabeth I: Elizabeth I, the final Tudor monarch, ruled England and Ireland from 1558 to 1603 until her demise.

Mary, Queen of Scots: ' Mary, Queen of Scots', also known as Mary Stuart or Mary I of Scotland, was the Queen of Scotland from 1542 to 1567.

James VI and I: James VI and I was the king of Scotland and England from 1567 until his death in 1625. He sought a closer political union between the two kingdoms, but they remained separate with their own parliaments, judiciaries, and laws. James ruled both kingdoms in personal union.

Charles I of England: Charles I was the King of England, Scotland, and Ireland from 1625 until his execution in 1649.

William III of England: William III of England, also known as William of Orange, was the Prince of Orange and Stadtholder in the Dutch Republic. He became the King of England, Ireland, and Scotland in 1689, ruling alongside his wife, Queen Mary II. Their joint reign is known as William and Mary.

George III: George III was the King of Great Britain and Ireland from 1760 until his death in 1820. He played a significant role in the Acts of Union 1800, which united Great Britain and Ireland into the United Kingdom. George was also the Duke and Prince-elector of Hanover before becoming the King of Hanover in 1814. Unlike his predecessors, he was born in Great Britain, spoke English as his first language, and never visited Hanover.

Robert Walpole: Robert Walpole, 1st Earl of Orford, was a British statesman and Whig politician. He served as the de facto first Prime Minister of Great Britain from 1725 to 1742. Walpole held important positions such as First Lord of the Treasury, Chancellor of the Exchequer, and Leader of the House of Commons.

William Pitt the Younger: William Pitt the Younger was a British statesman who served as the last prime minister of Great Britain before the Acts of Union in 1800. He then became the first prime minister of the United Kingdom from January 1801. He held office twice, from 1783 to 1801 and from 1804 until his death in 1806. Pitt was also the Chancellor of the Exchequer throughout his tenure as prime minister. He is commonly referred to as "Pitt the Younger" to distinguish him from his father, William Pitt the Elder, who had previously served as prime minister.

Oliver Cromwell: Oliver Cromwell was an influential English statesman, politician, and soldier. He played a significant role during the Wars of the Three Kingdoms from 1639 to 1653. Cromwell first served as a commander in the Parliamentarian army before becoming a politician. He strongly advocated for the execution of Charles I in 1649, which led to the establishment of The Protectorate. From 1653 until his death in 1658, he ruled as the Lord Protector. However, Cromwell remains a controversial figure due to his use of the army to gain political power and his brutal campaign in Ireland in 1649.

Maximilian I, Holy Roman Emperor: Maximilian I, Holy Roman Emperor, reigned from 1508 until his death in 1519. He became King of the Romans in 1486 and proclaimed himself emperor in 1508, breaking the tradition of requiring a papal coronation. He was the only surviving son of Frederick III, Holy Roman Emperor, and Eleanor of Portugal, and ran a double government with his father until 1493. The Pope's refusal to crown Maximilian in Rome prompted his self-election at Trent.

Charles V, Holy Roman Emperor: Charles V was a powerful ruler in the 16th century. He was the Holy Roman Emperor, King of Spain, and Lord of the Netherlands. He controlled vast territories in Europe, including Germany, Austria, Italy, and the Low Countries. He also had possessions in the Americas, overseeing Spanish and German colonization. Charles V's empire was so vast that it was called "the empire on which the sun never sets."

Ferdinand I, Holy Roman Emperor: Ferdinand I was Holy Roman Emperor from 1556 until his death in 1564. He ruled over Austria on behalf of his elder brother, Charles V, before becoming emperor. Ferdinand had strong ties with German princes and developed important relationships with the banking houses of Jakob Fugger and Banca Palenzuela Levi Kahana.

Leopold I, Holy Roman Emperor: Leopold I was a Holy Roman Emperor, ruling from 1658 until his death in 1705. He also held the titles of King of Hungary, Croatia, and Bohemia. As the heir apparent, he took the throne after the death of his elder brother Ferdinand IV in 1654. Leopold was known for being the second longest-ruling Habsburg emperor and a significant patron of music, as well as being a composer himself.

Maria Theresa: Maria Theresa was the ruler of the Habsburg dominions from 1740 until her death in 1780. She held numerous titles and territories including Austria, Hungary, Croatia, Bohemia, Transylvania, Mantua, Milan, Galicia and Lodomeria, the Austrian Netherlands, and Parma. Additionally, she was married to the Duke of Lorraine, Grand Duke of Tuscany, and Holy Roman Emperor.

Joseph II, Holy Roman Emperor: Joseph II, Holy Roman Emperor (1765-1790), was the ruler of the Habsburg monarchy and eldest son of Empress Maria Theresa and Emperor Francis I. He introduced reforms, advocated religious tolerance, and was part of the Habsburg-Lorraine dynasty.

William the Silent: William the Silent, also known as William of Orange, was the leader of the Dutch revolt against the Spanish Habsburgs. This revolt sparked the Eighty Years' War and eventually led to the formal independence of the United Provinces. He became Prince of Orange in 1544 and is the founder of the Orange-Nassau branch and ancestor of the Dutch monarchy. He is also known as the Father of the Fatherland in the Netherlands.

Frederick the Great: Frederick the Great, or Frederick II, was King of Prussia from 1740 to 1786. He achieved military success in the Silesian wars and reorganized the Prussian Army. He also played a pivotal role in the First Partition of Poland and supported the arts and Enlightenment ideals. Annexing Royal Prussia marked a turning point in his reign, and Prussia became a dominant military force in Europe. Frederick was known as Frederick the Great and earned the nickname "Old Fritz."

Frederick William I of Prussia: Frederick William I of Prussia, known as the Soldier King, ruled Prussia and Brandenburg from 1713 until his death in 1740. He also held the title of Prince of Neuchâtel.

Charles XII of Sweden: Charles XII of Sweden, also known as Carl XII or Carolus Rex, was the King of Sweden from 1697 to 1718. He came from the House of Palatinate-Zweibrücken, a branch line of the House of Wittelsbach. As the sole surviving son of Charles XI and Ulrika Eleonora the Elder, he took the throne at the young age of fifteen after a seven-month caretaker government.

Christina, Queen of Sweden: Christina, Queen of Sweden, was a member of the House of Vasa and ruled from 1632 to 1654. She became queen at the age of 18 and took control of the Swedish Empire in 1644.

Gustavus Adolphus: Gustavus Adolphus, also known as Gustav II Adolf, was the King of Sweden from 1611 to 1632. He played a significant role in making Sweden a dominant European power during the Thirty Years' War. As a skilled military leader, he led Sweden to become one of the primary military forces in Europe at that time. His reign had a profound impact on the political and religious balance of power in Europe. In recognition of his accomplishments, he was posthumously awarded the title Gustavus Adolphus the Great in 1634.

Cesare Borgia: Cesare Borgia: Italian cardinal and condottiero, illegitimate son of Pope Alexander VI. His pursuit of power influenced Niccolò Machiavelli's "The Prince".

Cosimo de' Medici: Cosimo de' Medici, an Italian banker and politician, rose to power as the effective ruler of Florence during the Italian Renaissance. He gained influence through his wealth as a banker and strategic inter-marriages. Known for his patronage, he generously invested over 600,000 gold florins in art, culture, and architecture. Notably, he sponsored Donatello's David, a groundbreaking freestanding nude male sculpture.

Lorenzo de' Medici: Lorenzo de' Medici, also known as Lorenzo the Magnificent, was an influential Italian statesman and patron of the arts during the Renaissance. He ruled over the Florentine Republic and supported renowned artists such as Botticelli and Michelangelo. Lorenzo held significant power within the Italic League, a group of states that stabilized the Italian peninsula. He opposed Pope Sixtus IV's territorial ambitions and was targeted in the Pazzi conspiracy, leading to the collapse of the Peace of Lodi. Lorenzo's tomb can be found in the Medici Chapel in Florence.

Girolamo Savonarola: Girolamo Savonarola, an Italian Dominican friar, preached in Renaissance Florence. He prophesied civic glory, called for the destruction of secular art and culture, and demanded Christian renewal. He denounced corruption, despotic rule, and the exploitation of the poor.

Pope Alexander VI: Summary: Pope Alexander VI, born into the powerful Borgia family, was the head of the Catholic Church and ruler of the Papal States from 1492 until his death in 1503. He studied law, became a cardinal, and gained influence in the Curia under multiple popes. In 1492, he was elected as Pope Alexander VI.

Pope Julius II: Pope Julius II, also known as the Warrior Pope, was the head of the Catholic Church and ruler of the Papal States from 1503 to 1513. He was nicknamed for his military prowess and admired Julius Caesar. His influential leadership during the High Renaissance left a significant cultural and political legacy. Through his policies in the Italian Wars, the Papal States gained power and centralization, and the papacy remained crucial in diplomacy and politics throughout the 16th century in Italy and Europe.

Prince Henry the Navigator: Prince Henry the Navigator was a Portuguese nobleman who played a crucial role in the European maritime discoveries of the 15th century. He was instrumental in initiating the Age of Discovery through his administrative direction. As the fourth child of King John I of Portugal, Henry was also known as Dom Henrique and Duke of Viseu.

Sebastião José de Carvalho e Melo, 1st Marquis of Pombal: Sebastião José de Carvalho e Melo, also known as the Marquis of Pombal, was a powerful Portuguese statesman who served as chief minister to King Joseph I from 1750 to 1777. Influenced by the Enlightenment, he implemented reforms and restored Portugal after the devastating 1755 Lisbon earthquake. However, his autocratic rule and persecution of the lower classes led to him being known as the "Nero of Trafaria."

Ferdinand II of Aragon: Ferdinand II of Aragon was the King of Aragon from 1479 until his death in 1516 and the King of Castile from 1475 to 1504. Together with his wife Isabella I, he ruled over a united Spain and became known as the Catholic Monarchs. Despite legal separation, Ferdinand is considered the first king of Spain.

Isabella I of Castile: Isabella I of Castile, known as Isabella the Catholic, was Queen of Castile and León from 1474 until she died in 1504. She also became Queen of Aragon in 1479 as the wife of King Ferdinand II. Isabella and Ferdinand are famous for ruling a unified Spain and are called the Catholic Monarchs.

Philip II of Spain: Philip II of Spain, also known as Philip the Prudent, ruled as King of Spain, Portugal, Naples, and Sicily from 1554 until his death in 1598. He was briefly the King of England and Ireland through his marriage to Queen Mary I. Additionally, he held the title of Duke of Milan and Lord of the Seventeen Provinces of the Netherlands from 1555.

Philip V of Spain: Philip V of Spain was the longest-reigning monarch in Spanish history, ruling from 1700 until his death in 1746. He implemented significant reforms that centralized power, abolished regional privileges, and restructured the administration of the Spanish Empire. These reforms were carried out through the Nueva Planta decrees, affecting both the Iberian Peninsula and overseas territories.

Bohdan Khmelnytsky: Bohdan Khmelnytsky was a Ruthenian nobleman who led a Cossack uprising against the Polish-Lithuanian Commonwealth (1648-1654), resulting in the establishment of an independent Cossack state in Ukraine. He later aligned with Russia through the Treaty of Pereiaslav (1654), granting central Ukraine Russian protection. The uprising included a massacre of Jews, a significant event in Ukrainian and Jewish history.

Matthias Corvinus: Matthias Corvinus, King of Hungary and Croatia (1458-1490), conducted military campaigns, became King of Bohemia (1469) and Duke of Austria (1487). He was the son of John Hunyadi and imprisoned in 1457. Matthias was proclaimed king at 14 years old, taking control of government shortly after.

Augustus II the Strong: Augustus II the Strong was an Elector of Saxony and King of Poland and Grand Duke of Lithuania. He belonged to the Albertine line of the House of Wettin.

Stephen Báthory: Stephen Báthory, a prominent figure in Eastern European history, held several titles throughout his life. He was a Voivode and later Prince of Transylvania (1571–1586), as well as King of Poland and Grand Duke of Lithuania (1576–1586).

John III Sobieski: John III Sobieski, also known as John Sobieski, was a prominent Polish king and grand duke of Lithuania from 1674 until his death in 1696.

Sigismund III Vasa: Sigismund III Vasa was a Polish and Swedish king who ruled from 1587 to 1632. He spread Roman Catholicism throughout his territories and launched successful military campaigns to expand Poland's borders. As an enlightened despot, he oversaw a period of prosperity and relocated the capital from Kraków to Warsaw.

Alexis of Russia: Alexei Mikhailovich, aka Alexis, was the Tsar of Russia from 1645 to 1676.

Catherine the Great: Catherine II, also known as Catherine the Great, ruled Russia from 1762 to 1796. She ousted her husband, Peter III, to become empress. During her reign, inspired by Enlightenment ideas, Russia flourished culturally and scientifically, resulting in the creation of new cities, universities, and theaters. This era also saw significant immigration from Europe and cemented Russia's status as a major European power.

Elizabeth of Russia: Elizabeth of Russia reigned as Empress from 1741 until 1762. She is highly regarded for her mercy, having refrained from executing anyone during her rule. Elizabeth undertook ambitious construction projects and fiercely opposed Prussian policies.

Ivan III of Russia: Ivan III Vasilyevich, also known as Ivan the Great, was the Grand Prince of Moscow and all Russia from 1462 until his death in 1505. He served as a co-ruler and regent for his blind father Vasily II before taking full control of the throne.

Ivan the Terrible: Ivan the Terrible, also known as Ivan IV, was the Grand Prince of Moscow and all Russia from 1533. He became the first Russian monarch to be crowned as Tsar in 1547 and ruled until his death in 1584.

Peter the Great: Peter the Great, also referred to as Peter I, was the Tsar and then Emperor of Russia from 1682 until his death in 1725. Initially sharing power with his half-brother, Peter became an absolute monarch in 1696 and held complete authority. Known for his harsh and autocratic methods, he played a significant role in modernizing Russia.

Kamehameha I: Kamehameha I, also known as Kamehameha the Great, was the first ruler of the Kingdom of Hawaii. He was a conqueror and a significant figure in Hawaiian history. A statue of him was gifted by the state of Hawaii to the National Statuary Hall Collection in Washington, D.C., representing his importance.

Menelik II: Menelik II was an Ethiopian king and later emperor from 1889 until his death in 1913. He successfully expanded Ethiopia's territory and established the modern empire-state by 1898.

Rainilaiarivony: Rainilaiarivony, a Malagasy politician, was the prime minister of Madagascar from 1864 to 1895, following his older brother Rainivoninahitriniony. He continued in his father's footsteps, as his father was an esteemed military figure and former prime minister under Queen Ranavalona I.

Tewodros II: Tewodros II was the Emperor of Ethiopia from 1855 to 1868. His reign marked the start of modern Ethiopia and put an end to the fragmented Zemene Mesafint era.

Yohannes IV: Yohannes IV was Emperor of Ethiopia from 1871 until he died in 1889 at the Battle of Gallabat. He was also the king of Tigray from 1869 to 1871. Yohannes IV is known for successfully defending Ethiopia against a significant Egyptian invasion.

Emir Abdelkader: Emir Abdelkader, also known as Abd al-Qadir al-Hassani al-Jaza'iri, was an Algerian religious and military leader in the early 19th century. He led a successful resistance against the French colonial invasion of Algiers. Despite being an Islamic scholar and Sufi, he gathered Algerian tribesmen and held strong against the advanced European army. His respect for human rights, even towards his Christian adversaries, earned him admiration. In 1860, he saved the Christian community of Damascus from a massacre, receiving honors globally. Within Algeria, he united Arab and Berber tribes to resist French colonization and was hailed as a "modern Jugurtha" for his efforts. He is recognized for his ability to combine religious and political authority, earning the title of the "Saint among the Princes, the Prince among the Saints."

Isma'il Pasha of Egypt: Isma'il Pasha, known as Ismail the Magnificent, was the Khedive of Egypt and Sudan from 1863 to 1879. He modernized both countries, investing in industrial and economic development, urbanization, and expanding Egypt's boundaries in Africa. However, he was removed from power by Great Britain and France.

Muhammad Ahmad: Muhammad Ahmad, a Sudanese leader, declared himself the Mahdi in 1881 and waged a victorious war against Egyptian rule in Sudan. He established an Islamic state covering a large region from the Red Sea to Central Africa. His movement had long-lasting influence in Sudan.

Muhammad Ali of Egypt: Muhammad Ali, an Ottoman Albanian ruler, governed Egypt from 1805 to 1848. Known as the founder of modern Egypt, he held control over Egypt, Sudan, Hejaz, Najd, the Levant, Crete, and parts of Greece during his peak.

Cecil Rhodes: Cecil Rhodes, an English colonialist, mining magnate, and politician, served as Prime Minister of the Cape Colony. He founded Rhodesia and worked towards establishing a Cape to Cairo Railway. Rhodes set up the Rhodes Scholarship, funded by his estate.

Shaka: Shaka, also known as Shaka Zulu, was the powerful king of the Zulu Kingdom from 1816 to 1828. He implemented significant military reforms that transformed his forces into a formidable fighting power. Shaka's reign had a tremendous impact on the Zulu nation, and he is regarded as one of their most influential monarchs.

Andrew Jackson: Andrew Jackson Jr was the 7th US president, serving from 1829 to 1837. He was a lawyer, planter, general, and statesman. Prior to his presidency, Jackson was a prominent general in the U.S. Army and had served in Congress. He is admired for his efforts to represent and protect ordinary Americans, while also criticized for his treatment of Native Americans.

James K. Polk: James K. Polk was the 11th president of the United States and a protégé of Andrew Jackson. He was a member of the Democratic Party and a strong advocate of Jacksonian democracy. During his presidency, Polk annexed the Republic of Texas, acquired the Oregon Territory, and expanded the nation's territory through the Mexican–American War.

Abraham Lincoln: Abraham Lincoln was the 16th president of the United States, serving from 1861 until his assassination in 1865. He led the nation during the American Civil War, defending the constitution and defeating the Confederate States. Lincoln abolished slavery, expanded federal power, and modernized the U.S. economy.

Theodore Roosevelt: Theodore Roosevelt Jr., also known as Teddy or T. R., was the 26th president of the United States from 1901 to 1909. He was a prominent American politician, conservationist, and writer. Before becoming president, he served as the 33rd governor of New York and the 25th vice president under President William McKinley. Roosevelt was a leader of the Republican Party and played a crucial role in promoting anti-trust and Progressive policies.

Woodrow Wilson: Woodrow Wilson was the 28th president of the United States from 1913 to 1921. He was a Democratic politician and academic, previously serving as the president of Princeton University and as the governor of New Jersey. Wilson transformed the nation's economic policies and led the United States into World War I in 1917. He is renowned as the main architect of the League of Nations and his progressive foreign policy approach is called Wilsonianism.

Franklin D. Roosevelt: Franklin D. Roosevelt, commonly known as FDR, was the 32nd president of the United States. He served from 1933 until his death and was a member of the Democratic Party. FDR is the only U.S. president to have served more than two terms. He focused on combatting the Great Depression during his first two terms and shifted his attention to America's participation in World War II in his third and fourth terms.

John C. Calhoun: John C. Calhoun was an influential American politician and thinker. He served as the 7th Vice President of the United States from 1825 to 1832 and was born in South Carolina. Initially a supporter of a strong federal government and protective tariffs, his beliefs evolved, leading him to champion states' rights, limited government, nullification, and oppose high tariffs. His defense of slavery and advocacy for Southern interests greatly influenced Southern secession from the Union in 1860 and 1861. Calhoun's resignation as Vice President was the first in U.S. history, with the second being Spiro Agnew in 1973.

Henry Clay: Henry Clay was an influential American lawyer and politician from Kentucky. He served in both the U.S. Senate and House of Representatives, and held important positions such as House speaker and secretary of state. Clay made unsuccessful bids for the presidency in 1824, 1832, and 1844. He played a significant role in founding the National Republican Party and the Whig Party. Known as the "Great Compromiser," Clay helped resolve conflicts between different regions of the United States. He was also part of the esteemed "Great Triumvirate" in Congress, along with Daniel Webster and John C. Calhoun.

Eleanor Roosevelt: Eleanor Roosevelt, a prominent American political figure and activist, was the longest-serving First Lady of the United States during her husband President Franklin D. Roosevelt's four terms in office. She redefined the role of First Lady through her travels, public engagement, and advocacy. As a United States Delegate to the United Nations, she played a leading role in designing the Universal Declaration of Human Rights, receiving a standing ovation upon its adoption in 1948. President Harry S. Truman recognized her as the "First Lady of the World" for her significant human rights achievements.

Sitting Bull: Sitting Bull was a Hunkpapa Lakota leader who fought against US government policies. He was killed during an attempted arrest on the Standing Rock Indian Reservation while authorities feared his involvement with the Ghost Dance movement.

John A. Macdonald: John A. Macdonald was Canada's first prime minister, serving from 1867 to 1873 and from 1878 to 1891. He played a crucial role in Canadian Confederation and had a long political career that lasted nearly 50 years.

Porfirio Díaz: Porfirio Díaz, also known as José de la Cruz Porfirio Díaz Mori, was a Mexican general and politician. He held the presidency of Mexico for a total of 31 years, from 1876 to 1880 and from 1884 to 1911. His time in power, known as the Porfiriato, is considered a de facto dictatorship.

Benito Juárez: Benito Juárez was the first indigenous president of Mexico and a prominent lawyer and statesman. He served as the 26th president from 1858 until his death in 1872. Prior to his presidency, he held various federal positions including Secretary of the Interior, Secretary of Public Education, and President of the Supreme Court. Juárez led the Liberals to success in the Reform War and the Second French intervention in Mexico.

Antonio López de Santa Anna: Antonio López de Santa Anna, also known as Santa Anna or López de Santa Anna, was a Mexican soldier, politician, and leader who served as the 8th president of Mexico several times between 1833 and 1855. He was also the Vice President of Mexico from 1837 to 1839. Santa Anna played a significant role in Mexican politics during the 19th century and is often referred to as an influential figure, even considered an "uncrowned monarch." Historians often refer to the three decades following Mexican independence as the "Age of Santa Anna."

Francisco Morazán: Francisco Morazán was a liberal politician who served as president of the Federal Republic of Central America from 1830 to 1839. He previously held the position of head of state in Honduras and gained prominence after the Battle of La Trinidad in 1827. Morazán played a dominant role in the politics and military affairs of Central America until his execution in 1842.

Rafael Trujillo: Rafael Trujillo, also known as El Jefe, was a Dominican dictator who ruled from 1930 to 1961. His 31-year regime, referred to as the Trujillo Era, was marked by a personality cult and brutal repression. Trujillo's security forces, such as the infamous SIM, were responsible for up to 50,000 murders, including the notorious Parsley massacre of Haitians in 1937. His dictatorship continues to impact Dominican-Haitian relations today.

José de San Martín: José de San Martín, also known as the Liberator of Argentina, Chile, and Peru, was an Argentine general and the main leader in South America's victorious fight for independence from the Spanish Empire. He served as the Protector of Peru. Born in Yapeyú, Argentina, he left at a young age to study in Spain.

Antonio José de Sucre: Antonio José de Sucre, also known as the "Gran Mariscal de Ayacucho," was a Venezuelan general and politician. He served as the president of Bolivia from 1825 to 1828 and played a significant role in South America's fight for independence from the Spanish Empire. Sucre was a trusted friend and associate of Simón Bolívar, making him one of the key leaders during this crucial period of history.

Pedro I of Brazil: Pedro I of Brazil, also known as "the Liberator," was the founder and first ruler of the Empire of Brazil. He briefly reigned as King Dom Pedro IV of Portugal and earned the titles of "the Liberator" and "the Soldier King." Born in Lisbon, Pedro I was the fourth child of King Dom John VI of Portugal. He and his family fled to Brazil when the country was invaded by French troops in 1807.

Pedro II of Brazil: Pedro II of Brazil, also known as Dom Pedro II, was the last emperor of the Empire of Brazil. He reigned for over 58 years, from a young age after his father's abdication. Born in Rio de Janeiro, he grew up facing challenges and developed a strong sense of duty towards his country. Despite court intrigues and political disputes, Pedro II remained devoted to his people but grew resentful of his role as monarch.

Getúlio Vargas: Getúlio Vargas, a prominent Brazilian lawyer and politician, served as the 14th and 17th president of Brazil from 1930 to 1945 and 1951 to 1954. Known for his lengthy and contentious leadership in various roles, Vargas is widely regarded as the most influential Brazilian politician of the 20th century by historians.

Simón Bolívar: Simón Bolívar was a Venezuelan military and political leader who liberated several South American countries from Spanish rule, including Colombia, Venezuela, Ecuador, Peru, Panama, and Bolivia. He is commonly referred to as El Libertador, or the Liberator of America.

Empress Dowager Cixi: Empress Dowager Cixi, a noblewoman from the Yehe Nara clan, ruled China for almost 50 years in the late Qing dynasty. She became a concubine in her youth and gave birth to a son. After her husband's death, she shared power with his first wife. Cixi then took control, removing a group of regents and becoming the regent herself. She solidified her power by appointing her nephew as the new emperor. Co-regency continued until the death of her partner, Ci'an, in 1881.

Puyi: Puyi was the last Emperor of China, ruling during the Qing dynasty. He became emperor at the age of two in 1908 but was forced to abdicate at the age of six in 1912. Later, he served as the leader of the puppet state of Manchukuo under Japan from 1934 to 1945.

Chiang Kai-shek: Chiang Kai-shek was a prominent Chinese politician, military leader, and revolutionary. He served as the leader of the Republic of China and the Generalissimo of the National Revolutionary Army from 1928 until 1949. Following the defeat of his nationalist Kuomintang party by the Chinese Communist Party in the Chinese Civil War, he led the remaining ROC government on Taiwan until his death.

Soong Mei-ling: Soong Mei-ling, also known as Madame Chiang Kai-shek, was a prominent Chinese political figure and the wife of President Chiang Kai-shek. She played a significant role in the politics of the Republic of China and was actively involved in various civic positions. Soong was the sister-in-law of Sun Yat-sen, the founder and leader of the Republic of China. During World War II, she actively opposed the Japanese and conducted a successful speaking tour in the United States in 1943 to gain support.

Emperor Meiji: Emperor Meiji, the 122nd emperor of Japan, ruled from 1867 until his death and was the first monarch of the Empire of Japan. His reign oversaw the Meiji Restoration, a period of rapid change that transformed Japan from an isolationist, feudal state to an industrialized world power.

Hideki Tojo: Hideki Tojo was a Japanese politician and military leader who served as prime minister of Japan during World War II. He was involved in extreme state-perpetrated violence and was personally responsible for promoting Japanese ultranationalism. Tojo held various positions of power, including president of the Imperial Rule Assistance Association and chief of staff of the Imperial Army. He was later convicted as a war criminal and removed from power in July 1944.

Chulalongkorn: Chulalongkorn, also known as Rama V, was the fifth monarch of Siam under the House of Chakri. He ruled from 1868 until his death in 1910.

George Curzon, 1st Marquess Curzon of Kedleston: George Curzon, 1st Marquess Curzon of Kedleston, was a prominent British statesman and writer. He served as Viceroy of India from 1899 to 1905 and held various titled positions within the British aristocracy.

Abdul Hamid II: Abdul Hamid II, the 34th sultan of the Ottoman Empire (1876-1909), commanded the declining state, faced rebellions, and engaged in conflicts. He led an unsuccessful war with the Russian Empire (1877-78) and a successful war against the Kingdom of Greece in 1897. However, Western European intervention limited Ottoman gains.

Mustafa Kemal Atatürk: Mustafa Kemal Atatürk was a Turkish leader who served as the first president of the Republic of Turkey from 1923 until his death in 1938. He was a field marshal, revolutionary statesman, author, and the founder of modern Turkey. Atatürk implemented progressive reforms that modernized the country, turning it into a secular and industrialized nation. His political theories and policies, known as Kemalism, emphasized secularism and nationalism.

Mahmud II: Mahmud II was the sultan of the Ottoman Empire from 1808 to 1839. Known as the "Peter the Great of Turkey," he implemented widespread administrative, military, and fiscal reforms. His most significant reform was the Decree of Tanzimat, later carried out by his successors. By disbanding the conservative Janissary corps, Mahmud removed a major obstacle to his and his successors' reforms. However, his reign was also marked by Ottoman military defeats, territorial losses, nationalist uprisings, and European intervention.

Ibn Saud: Ibn Saud, also known as Abdulaziz bin Abdul Rahman Al Saud, was a prominent Arab leader who established Saudi Arabia as its first king in 1932. He had gradually ruled parts of the kingdom since 1902, holding titles such as Emir, Sultan, and King of Nejd, as well as King of Hejaz. Ibn Saud's reign continued until his death in 1953.

Leopold II of Belgium: Leopold II of Belgium: Second King of Belgium (1865-1909) and the founder of the Congo Free State (1885-1908).

Georges Clemenceau: Georges Clemenceau was a French statesman and Prime Minister from 1906-1909 and 1917-1920. He was a leading member of the Independent Radicals and advocated for the separation of church and state, amnesty for exiled Communards, and opposed colonisation. Originally a physician, Clemenceau played a major role in the politics of the Third Republic.

Louis Philippe I: Louis Philippe I, the Citizen King, ruled France from 1830 to 1848 as its penultimate monarch.

Napoleon III: Napoleon III was the first president of France (1848-1852) and the last monarch, serving as Emperor of the French (1852-1870) before being overthrown on 4 September 1870.

Adolphe Thiers: Adolphe Thiers was a prominent French statesman and historian. He served as the first President of the Third Republic and was the second elected President of France.

Eduard Bernstein: Eduard Bernstein was a prominent German social democratic theorist and politician who initially embraced Marxism. However, he gradually challenged and criticized key aspects of Marxist thinking, particularly the materialist theory of history and the concept of an inherent economic necessity for socialism. He rejected the influence of Hegelian metaphysics and advocated for a more moderate and reformist approach within the Social Democratic Party of Germany.

Otto von Bismarck: Otto von Bismarck was a prominent Prussian and German statesman and diplomat. He held titles such as Prince of Bismarck, Count of Bismarck-Schönhausen, and Duke of Lauenburg.

William I, German Emperor: William I, German Emperor, was the first head of state for a united Germany. He was the King of Prussia from 1861 and the German Emperor from 1871 until his death in 1888. As a member of the House of Hohenzollern, he became the de facto head of state of Prussia in 1858 when he became regent for his brother. He was widely recognized as Wilhelm the Great during the reign of his grandson, Wilhelm II.

Wilhelm II: Wilhelm II, the last German Emperor and King of Prussia, reigned from 1888 to 1918. His abdication marked the end of the German Empire and the House of Hohenzollern's 300-year rule in Prussia and 500-year rule in Brandenburg.

Joseph Goebbels: Joseph Goebbels was a prominent Nazi politician and influential figure during the Third Reich. He held various positions, including Gauleiter of Berlin and Reich Minister of Propaganda. Goebbels was known for his powerful public speaking and extreme hatred towards Jews, advocating for their extermination in the Holocaust.

Adolf Hitler: Adolf Hitler was an Austrian-born German dictator who led the Nazi Party. He became chancellor in 1933 and later held the title of Führer und Reichskanzler. Hitler initiated World War II by invading Poland in 1939 and was heavily involved in military operations. He played a central role in the Holocaust, the genocide of approximately six million Jews and millions of other victims.

Michael Collins (Irish leader): Michael Collins was an important leader in the fight for Irish independence in the early 20th century. He served as Director of Intelligence for the IRA during the War of Independence and held positions in the Irish Republic's government. Collins later became Chairman of the Irish Free State's Provisional Government and commander-in-chief of the National Army. Sadly, he was killed in an ambush during the Civil War in August 1922.

Éamon de Valera: Éamon de Valera, an Irish statesman and leader, played a significant role in Irish politics. He served as both head of government and head of state, introducing the 1937 Constitution of Ireland.

Camillo Benso, Count of Cavour: Camillo Benso, Count of Cavour was a leading figure in the movement towards Italian unification. He served as Prime Minister of the Kingdom of Sardinia and later became the first Prime Minister of Italy after the country's unification. Despite his short tenure, he played a crucial role in solving the Roman Question.

Benito Mussolini: Benito Mussolini, an Italian dictator and journalist, was the founder and leader of the National Fascist Party. He served as the Prime Minister of Italy from 1922 to 1943 and was known as the "Duce" of Italian fascism. Mussolini played a major role in spreading fascism worldwide during the inter-war period. His rule ended in 1945 when he was executed by Italian partisans.

Charles XIV John: Charles XIV John was the King of Sweden and Norway from 1818 until his death in 1844 and the first monarch of the Bernadotte dynasty. He was also known as Charles III John in Norway and his original name was Jean-Baptiste Jules Bernadotte. Prior to becoming royalty in Sweden, he served as a Marshal of France during the Napoleonic Wars and participated in numerous battles.

Carl Gustaf Emil Mannerheim: Carl Gustaf Emil Mannerheim was a Finnish military leader and statesman who played significant roles in Finnish history. He led the Whites in the Finnish Civil War, served as Regent of Finland, and was commander-in-chief of the Finnish Defence Forces during World War II. He also served as Finland's sixth president and held the distinguished titles of field marshal and honorary Marshal of Finland.

Queen Victoria: Queen Victoria reigned over the United Kingdom from 1837 until 1901, marking the Victorian era. Her 63-year rule witnessed significant industrial, political, scientific, and military transformations within the country, along with the expansion of the British Empire. In recognition of her influence, she was also granted the title Empress of India in 1876.

Robert Peel: Robert Peel, a British statesman, was Prime Minister and Chancellor of the Exchequer twice. He is known as the father of modern British policing for establishing the Metropolitan Police Service. Peel was also a founder of the modern Conservative Party.

Benjamin Disraeli: Benjamin Disraeli was a British statesman who served as Prime Minister twice. He played a vital role in shaping the modern Conservative Party and was known for his political battles with Liberal Party leader William Gladstone. Disraeli's one-nation conservatism or "Tory democracy" helped make the Conservatives popular by associating them with the British Empire and military expansion. Notably, he was the only British Prime Minister of Jewish heritage.

William Ewart Gladstone: William Ewart Gladstone was a renowned British statesman and Liberal politician who served as the Prime Minister of the United Kingdom for four non-consecutive terms spanning from 1868 to 1894. Additionally, he held the position of Chancellor of the Exchequer for over 12 years, making significant contributions to the country's economic matters.

David Lloyd George: David Lloyd George, 1st Earl Lloyd-George of Dwyfor, was a Welsh Liberal Party politician who served as Prime Minister of the United Kingdom from 1916 to 1922. He led the country during World War I, implemented significant social reforms, played a crucial role in the Paris Peace Conference, and negotiated the creation of the Irish Free State. He was the last Liberal Party prime minister, and the party's decline began shortly after his tenure.

Winston Churchill: Winston Churchill, a renowned British statesman, soldier, and writer, served as the Prime Minister of the United Kingdom during the Second World War. He also held the position from 1951 to 1955. Churchill was a Member of Parliament from 1900 to 1964, representing multiple constituencies. He was known for his economic liberalism, imperialism, and leadership of the Conservative Party from 1940 to 1955. Additionally, he was a member of the Liberal Party from 1904 to 1924.

Charles Stewart Parnell: Charles Stewart Parnell was an influential Irish nationalist politician who served as an MP from 1875 to 1891. He was the leader of the Home Rule League and later the Irish Parliamentary Party, holding significant power during debates on Home Rule from 1885 to 1886. However, his political career ended due to revelations of a scandalous affair, and he died at the age of 45.

Francis II, Holy Roman Emperor: Francis II, Holy Roman Emperor, also known as Francis I of Austria, ruled from 1792 to 1806 as the last Holy Roman Emperor. He later became the first Emperor of Austria from 1804 to 1835. Francis II was also the King of Hungary, Croatia, and Bohemia, and played a vital role as the first president of the German Confederation after its formation in 1815.

Franz Joseph I of Austria: Franz Joseph I of Austria, also known as Francis Joseph I, was the Emperor of Austria and King of Hungary from 1848 until his death in 1916. He ruled over the Habsburg monarchy and his territories were initially referred to as the Austrian Empire, later becoming the Austro-Hungarian Empire in 1867. During his reign, from 1850 to 1866, he also served as the president of the German Confederation.

Klemens von Metternich: Klemens von Metternich, also known as Prince Metternich, was an influential Austrian statesman and diplomat. He played a central role in the European balance of power known as the Concert of Europe. Serving as Austria's foreign minister from 1809 and later as Chancellor from 1821, he held significant influence for three decades. However, his resignation was ultimately forced due to the liberal Revolutions of 1848.

Józef Piłsudski: Józef Piłsudski was a Polish statesman and the Chief of State and first Marshal of Poland from 1918-1922. He played a crucial role in shaping Poland's foreign policy after World War I and is considered the father of the Second Polish Republic, established in 1918. Piłsudski also served as the de facto leader of the Second Republic from 1926-1935 as the Minister of Military Affairs.

Alexander I of Russia: Alexander I, also known as "the Blessed," was the Emperor of Russia from 1801 until his death in 1825. He was the first king of Congress Poland from 1815 and the grand duke of Finland from 1809. Alexander I was the eldest son of Emperor Paul I and Sophie Dorothea of Württemberg.

Alexander II of Russia: Alexander II of Russia was the Emperor of Russia, King of Poland, and Grand Duke of Finland from 1855 to 1881. He is remembered as Alexander the Liberator for his significant reform of freeing Russia's serfs in 1861.

Nicholas I of Russia: Nicholas I of Russia, Emperor of Russia and King of Congress Poland, was known for his centralized policies and repression of dissent during his controversial reign. Despite a failed revolt, he expanded Russia's borders and had a successful marriage that resulted in seven surviving children.

Nicholas II of Russia: Nicholas II was the last Emperor of Russia, King of Poland, and Grand Duke of Finland from 1894 to 1917. He supported economic and political reforms, but clung to autocratic rule and faced opposition. His reign was marked by defeats in wars and a collapse in public support, leading to his abdication and the end of the 304-year Romanov dynasty in Russia.

Vladimir Lenin: Vladimir Lenin was a Russian revolutionary, politician, and political theorist who founded and led the Soviet Union. He established a one-party socialist state and developed the ideology known as Leninism.

Joseph Stalin: Joseph Stalin was a Soviet revolutionary and politician who led the Soviet Union from 1924 until his death in 1953. He held powerful positions within the Communist Party and the government, becoming a dictator in the 1930s. Stalin adhered to the ideology of Marxism–Leninism and his policies are known as Stalinism.

Leon Trotsky: Leon Trotsky was a Russian revolutionary, politician, theorist, and founder of the Red Army. He played a crucial role in the October Revolution, Russian Civil War, and the establishment of the Soviet Union. Alongside Lenin, Trotsky was a prominent figure and de facto second-in-command during the early years of the Russian Soviet Republic. His Marxist and Leninist ideas gave rise to Trotskyism, a significant school of Marxism.

Ante Pavelić: Ante Pavelić was a Croatian politician who founded and led the ultranationalist group Ustaše. He served as the dictator of the fascist puppet state, Independent State of Croatia (NDH), from 1941 to 1945. Pavelić and the Ustaše targeted minority groups including Serbs, Jews, Romani, and anti-fascists, orchestrating genocides and the Holocaust in the NDH.

Ion Antonescu: Ion Antonescu, a Romanian military officer and marshal, served as Prime Minister and Conducător during World War II. He played a role in enabling the Holocaust in Romania and was later tried for war crimes, ultimately being executed in 1946.

John Curtin: John Curtin was the 14th prime minister of Australia from 1941 until his death in 1945. He led the country through most of World War II, including the Pacific War. Curtin's leadership and character were highly regarded, making him one of Australia's greatest political leaders.

Muammar Gaddafi: Muammar Gaddafi was a Libyan revolutionary and politician who ruled Libya from 1969 until his death in 2011. He served as Revolutionary Chairman of the Libyan Arab Republic from 1969 to 1977 and then as the Brotherly Leader of the Great Socialist People's Libyan Arab Jamahiriya from 1977 to 2011. Gaddafi started with Arab nationalism and socialism but later developed his own ideology called the Third International Theory. He was killed by NATO-backed rebel forces.

Gamal Abdel Nasser: Gamal Abdel Nasser was an Egyptian military officer and politician who became the second president of Egypt. He led the 1952 revolution, implemented land reforms, and cracked down on the Muslim Brotherhood. He assumed executive office after an assassination attempt on his life, and was later elected president in June 1956.

Anwar Sadat: Anwar Sadat was a prominent Egyptian politician and military officer who served as the third president of Egypt from 1970 until his assassination in 1981. He was a key member of the Free Officers who overthrew King Farouk in 1952 and a close confidant of President Gamal Abdel Nasser. Sadat signed a peace treaty with Israeli Prime Minister Menachem Begin in 1978, which earned them the Nobel Peace Prize.

Kenneth Kaunda: Kenneth Kaunda, aka KK, was the first president of Zambia (1964-1991) and played a vital role in the country's struggle for independence from British rule. He broke away from the Northern Rhodesian African National Congress and formed the Zambian African National Congress, later leading the socialist United National Independence Party (UNIP).

Haile Selassie: Haile Selassie was the Emperor of Ethiopia from 1930 to 1974, and also served as Regent Plenipotentiary for Empress Zewditu from 1916 to 1930. He is an important figure in Ethiopian history and played a crucial role in the Rastafari movement in Jamaica. Haile Selassie was victorious in the Battle of Anchem in 1928, defeating Ras Gugsa Wole Bitul of Begemidr. He belonged to the Solomonic dynasty, claiming ancestry from Menelik I, believed to be the son of King Solomon and the Queen of Sheba.

Jomo Kenyatta: Jomo Kenyatta was a Kenyan anti-colonial activist and politician who served as Prime Minister and the first President of Kenya from 1963 to 1978. He played a crucial role in Kenya's independence from British rule and was an African nationalist leader of the Kenya African National Union (KANU) party.

Julius Nyerere: Julius Nyerere was a Tanzanian political leader and theorist. He played a key role in the country's independence movement and served as prime minister and president of Tanganyika and later Tanzania from 1961 to 1985. He was a founding member of TANU and Chama Cha Mapinduzi parties. Nyerere advocated for African nationalism and socialism, famously promoting the Ujamaa philosophy.

Idi Amin: Idi Amin was a Ugandan military officer and politician who ruled as the third president of Uganda from 1971 to 1979. He was known for his brutal dictatorship and is considered one of the most ruthless despots in recent history.

Kofi Annan: Kofi Annan, a Ghanaian diplomat, was the seventh UN secretary-general from 1997 to 2006. He received the Nobel Peace Prize in 2001 alongside the United Nations. Annan established the Kofi Annan Foundation and chaired The Elders, an organization formed by Nelson Mandela.

Kwame Nkrumah: Kwame Nkrumah was a Ghanaian politician and revolutionary who served as Prime Minister and later President of Ghana from 1957 to 1966. He was a Marxist and a strong advocate of Pan-Africanism. Nkrumah played a crucial role in gaining independence for Ghana from Britain and was a founding member of the Organization of African Unity. He was also awarded the Lenin Peace Prize by the Soviet Union in 1962.

Ellen Johnson Sirleaf: Ellen Johnson Sirleaf, a Liberian politician, made history as Africa's first elected female head of state. Serving as the 24th president of Liberia from 2006 to 2018, her tenure marked significant progress in the country.

Nnamdi Azikiwe: Nnamdi Azikiwe, also known as "Zik," was a Nigerian statesman who played a crucial role in Nigeria's independence. He served as the 3rd governor-general of Nigeria from 1960 to 1963 and became the 1st president of Nigeria during the First Nigerian Republic from 1963 to 1966. Azikiwe was highly influential and regarded as the "father of Nigerian nationalism."

Olusegun Obasanjo: Olusegun Obasanjo is a Nigerian retired military General and statesman. He served as Nigeria's head of state from 1976 to 1979 and later as its president from 1999 to 2007. Obasanjo is a Nigerian nationalist, and he was a member of the Peoples Democratic Party (PDP) from 1998 to 2015 and since 2018.

Léopold Sédar Senghor: Léopold Sédar Senghor, a Senegalese poet, politician, and cultural theorist, served as the first president of Senegal from 1960 to 1980.

Mobutu Sese Seko: Mobutu Sese Seko, also known as Mobutu, was a Congolese politician and military officer who ruled Zaire from 1965 to 1997. He took power through two coups, one in 1960 and another in 1965, and played a significant role in the Congo Crisis. With the support of Belgium and the United States, he ousted the democratically elected government of Patrice Lumumba and orchestrated Lumumba's execution. Mobutu served as Chairman of the Organisation of African Unity from 1967 to 1968.

Hastings Banda: Hastings Banda led Malawi from 1964 to 1994, serving as Prime Minister initially and later becoming the country's first president. He ruled until his defeat in 1994 after overseeing the transition of Malawi into a republic in 1966.

Robert Mugabe: Robert Mugabe was a Zimbabwean revolutionary and politician who served as Prime Minister and later President of Zimbabwe from 1980 to 2017. He led the Zimbabwe African National Union (ZANU) and its successor, the ZANU – Patriotic Front, during his tenure. Mugabe identified as an African nationalist, followed Marxist-Leninist ideology during the 1970s and 1980s, and later became a socialist.

F. W. de Klerk: F. W. de Klerk, a South African politician, served as state president of South Africa from 1989 to 1994. He played a crucial role in dismantling the apartheid system and introducing universal suffrage. De Klerk was the last head of state from the era of white-minority rule and led the National Party from 1989 to 1997.

Nelson Mandela: Nelson Mandela was a South African anti-apartheid activist and politician. He served as the first black president of the country from 1994 to 1999, following a fully representative democratic election. Mandela's government prioritized the dismantling of apartheid and promoting racial reconciliation. He was an African nationalist and socialist, and also served as the president of the African National Congress (ANC) party from 1991 to 1997.

Pierre Trudeau: Pierre Trudeau: a Canadian lawyer and politician who served as the 15th prime minister of Canada from 1968 to 1979 and from 1980 to 1984. He also briefly led the opposition from 1979 to 1980.

Harry S. Truman: Harry S. Truman, the 33rd US President (1945-1953), was a member of the Democratic Party and previously served as a senator from Missouri. He became vice president in 1945 under FDR and assumed the presidency upon his death. Truman implemented the Marshall Plan to rebuild post-WWII Western Europe, established the Truman Doctrine and NATO to counter Soviet communism, and proposed liberal domestic reforms that faced opposition from a conservative Congress.

Dwight D. Eisenhower: Dwight D. Eisenhower, aka Ike, was a prominent American military officer and statesman. He served as the 34th president of the United States from 1953 to 1961. Eisenhower played a crucial role in World War II, serving as Supreme Commander of the Allied Expeditionary Force in Europe. He achieved the distinguished five-star rank of General of the Army. Eisenhower was responsible for planning and overseeing significant military campaigns, including Operation Torch in the North Africa campaign and the invasion of Normandy in 1944.

John F. Kennedy: John F. Kennedy, also known as JFK or Jack, was the 35th President of the United States. He served from 1961 until his assassination in 1963 and was the youngest person elected president. He focused on Cold War concerns, particularly in relations with the Soviet Union and Cuba. Prior to his presidency, he represented Massachusetts in the U.S. Congress as a Democrat.

Lyndon B. Johnson: Lyndon B. Johnson, also known as LBJ, was the 36th president of the United States from 1963 to 1969. He took office following the assassination of John F. Kennedy. Prior to becoming president, Johnson served as the vice president from 1961 to 1963. Additionally, he had a political career as a U.S. representative and U.S. senator, representing the Democratic Party from Texas.

Richard Nixon: Richard Nixon was the 37th president of the United States from 1969 to 1974. He was a member of the Republican Party and had previously served as a representative, senator, and vice president under President Eisenhower. Nixon's presidency involved reducing U.S. involvement in the Vietnam War, improving relations with the Soviet Union and China, overseeing the Apollo 11 Moon landing, and creating the Environmental Protection Agency and Occupational Safety and Health Administration. However, his second term was cut short due to his resignation after the Watergate scandal.

Ronald Reagan: Ronald Reagan, the 40th president of the United States, was an influential American politician and actor from 1981 to 1989. As a member of the Republican Party, his presidency defined the Reagan era and established him as a prominent conservative figure in US history.

George W. Bush: George W. Bush, an American politician and businessman, was the 43rd president of the United States from 2001 to 2009. He belonged to the Republican Party and was also the 46th governor of Texas from 1995 to 2000.

Barack Obama: Barack Obama is an American politician who became the first African-American president of the United States from 2009 to 2017. Prior to his presidency, he served as a senator representing Illinois and a civil rights lawyer and university lecturer.

Donald Trump: Donald Trump, a well-known American politician, media personality, and businessman, held the position of the 45th president of the United States from 2017 to 2021.

Fidel Castro: Fidel Castro was a Cuban revolutionary and politician, who led Cuba from 1959 to 2008. He served as prime minister from 1959 to 1976 and president from 1976 to 2008. Castro was a Marxist-Leninist and Cuban nationalist, and he also held the position of first secretary of the Communist Party of Cuba from 1965 to 2011. During his leadership, Cuba became a one-party communist state with nationalized industry and business, as well as implementing socialist reforms throughout society.

François Duvalier: François Duvalier, also known as Papa Doc, was the president of Haiti from 1957 until 1971. Initially elected on a populist and black nationalist platform, his regime quickly turned autocratic and despotic. He used a government death squad, the Tonton Macoute, to brutally suppress dissent, creating a climate of fear. Duvalier also cultishly incorporated Haitian mythology into his rule.

Juan Perón: Juan Perón was an Argentine military general and politician who served as the President of Argentina from 1946 to 1955 and from 1973 until his death in 1974. He held various government positions, including Minister of Labour and Vice President, and played a significant role in Argentine politics during his tenure.

Salvador Allende: Salvador Allende was a socialist politician who became the 28th president of Chile in 1970. He was a democratic socialist, known for his commitment to democracy and was the first Marxist to be elected as president in a Latin American liberal democracy. He served in this role until his death in 1973.

Augusto Pinochet: Augusto Pinochet was a Chilean military officer and politician who ruled as the de facto dictator of Chile from 1973 to 1990. He first led the Military Junta of Chile and later became President of the Republic. Pinochet's rule was the longest in Chilean history.

Alfredo Stroessner: Alfredo Stroessner was a Paraguayan army officer and politician who served as President of Paraguay from 1954 to 1989. He came to power through a coup d'état supported by the army and the Colorado Party. Stroessner was affiliated with the party and became its presidential candidate in the 1954 election, winning uncontested due to the ban on other political parties during that time.

Hugo Chávez: Hugo Chávez was a Venezuelan politician and military officer who served as president of Venezuela from 1999 until his death in 2013. He was the leader of the Fifth Republic Movement political party and later the United Socialist Party of Venezuela.

Deng Xiaoping: Deng Xiaoping, a Chinese revolutionary and market socialist, was the paramount leader of the People's Republic of China from 1978 to 1989. After Mao Zedong's death, Deng implemented significant market-economy reforms, earning him the title "Architect of Modern China."

Jiang Qing: Jiang Qing, also called Madame Mao, was a prominent Chinese communist revolutionary and actress. She was Mao Zedong's fourth wife and played a significant role in the Cultural Revolution as part of the Gang of Four.

Mao Zedong: Mao Zedong, a Chinese politician and revolutionary, founded the People's Republic of China (PRC) in 1949 and led the country until his death in 1976. He was also the chairman of the Chinese Communist Party. Mao's legacy includes his theories, military strategies, and policies which are known as Maoism.

Xi Jinping: Xi Jinping is a Chinese politician and the current leader of China since 2012. He holds multiple key positions including general secretary of the Chinese Communist Party, chairman of the Central Military Commission, and president of the People's Republic of China. Xi Jinping belongs to the fifth generation of Chinese leadership.

Zhou Enlai: Zhou Enlai was a prominent Chinese statesman and diplomat who served as the first Premier of the People's Republic of China from 1954 until his death in 1976. He played a vital role in helping the Communist Party gain power under Chairman Mao Zedong and was instrumental in shaping China's foreign policy and economic development.

Hirohito: Hirohito, also known as Emperor Shōwa, was the 124th emperor of Japan. He ruled for over 62 years, from 1926 until his death in 1989, making him the longest-reigning Japanese emperor and one of the longest-reigning monarchs worldwide.

Shinzo Abe: Shinzo Abe, a prominent Japanese politician, served as the Prime Minister of Japan and President of the Liberal Democratic Party (LDP) from 2006-2007 and 2012-2020. An influential figure in Japanese politics, Abe holds the record for being the country's longest-serving prime minister, having served nearly nine years overall. He also played significant roles as Chief Cabinet Secretary from 2005-2006 and briefly as the opposition leader in 2012.

Eisaku Satō: Eisaku Satō, a Japanese politician, served as prime minister of Japan from 1964 to 1972. He is the third longest-serving prime minister and second in longest uninterrupted service.

Kim Il Sung: Kim Il Sung, a North Korean politician, founded and ruled North Korea as its Supreme Leader from 1948 until his death in 1994. He was later declared eternal president.

Park Chung Hee: Park Chung Hee, a South Korean politician and army general, seized power in a 1961 coup and became the third President of South Korea in 1963. He governed until his assassination in 1979. Park is considered a significant figure in Korean history, but his military dictatorship remains a source of debate.

Syngman Rhee: Syngman Rhee, a South Korean politician also known as Unam, served as the first president of South Korea from 1948 to 1960. He was also the first and last president of the Provisional Government of the Republic of Korea from 1919 to 1925 and from 1947 to 1948. Rhee's presidency was marked by authoritarianism, limited economic development, and increasing political instability and public opposition in the late 1950s.

Ne Win: Ne Win, a prominent Burmese politician and military commander, held significant positions of power in Burma. He served as Prime Minister from 1958 to 1960 and 1962 to 1974, while also holding the presidency from 1962 to 1981. Ne Win became Burma's military dictator during the Socialist Burma era from 1962 to 1988.

Pol Pot: Pol Pot, a Cambodian dictator and politician, led the Khmer Rouge communist movement from 1963 to 1997. Serving as Prime Minister from 1976 to 1979, he transformed Cambodia into a one-party communist state and carried out the devastating Cambodian genocide.

Suharto: Suharto was a military officer and politician who served as the second and longest-serving president of Indonesia. He led the country as an authoritarian regime for 32 years, following the fall of his predecessor Sukarno in 1967. Suharto's dictatorship is widely regarded as one of the most brutal and corrupt of the 20th century, and he resigned in 1998 due to nationwide unrest.

Sukarno: Sukarno: Indonesian statesman, orator, and revolutionary. First president of Indonesia from 1945 to 1967. A prominent nationalist figure.

Mahathir Mohamad: Mahathir Mohamad is a Malaysian politician and physician, known for being the country's longest-serving prime minister. He held office for a total of 24 years, from 1981 to 2003 and later from 2018 to 2020. Before becoming prime minister, he served in various cabinet positions and as deputy prime minister. He also had a long political career, spanning over 75 years, and was involved in protests against non-Malay citizenship policies.

Corazon Aquino: Corazon Aquino was the eleventh president of the Philippines from 1986 to 1992. She played a significant role in the 1986 People Power Revolution, which brought an end to President Ferdinand Marcos' rule and established the current democratic Fifth Philippine Republic.

Ferdinand Marcos: Ferdinand Marcos was a Filipino politician who served as the tenth president of the Philippines from 1965 to 1986. He ruled as a dictator, implementing martial law from 1972 to 1981 and maintaining its powers until his overthrow. His regime was marked by corruption, extravagance, and brutality.

Lee Kuan Yew: Lee Kuan Yew, often referred to as LKY, was a Singaporean statesman and lawyer. He served as the first Prime Minister of Singapore and was the Secretary-General of the People's Action Party. Lee was widely recognized as the founding father of modern Singapore, known for transforming the island into a highly developed city-state.

Ho Chi Minh: Ho Chi Minh, also known as Uncle Ho, was a Vietnamese communist revolutionary and politician. He served as the Prime Minister and later as the President of the Democratic Republic of Vietnam from 1945 until his death in 1969. He was a Marxist-Leninist and the Chairman and First Secretary of the Workers' Party of Vietnam.

Sheikh Mujibur Rahman: Sheikh Mujibur Rahman, also known as Bangabandhu, was a Bangladeshi politician and revolutionary. He played a crucial role in leading the country's independence movement and restoring Bengali sovereignty after centuries of foreign rule. Mujib held multiple positions as president and prime minister from 1971 until his assassination in 1975. He is honored as the 'Father of the Nation' in Bangladesh and his political ideology is known as Mujibism.

Indira Gandhi: Indira Gandhi was an Indian politician who served as the third and only female Prime Minister of India. She was a central figure in Indian politics as the leader of the Indian National Congress. Gandhi held office from 1966 to 1977 and again from 1980 until she was assassinated in 1984. She was the daughter of India's first Prime Minister, Jawaharlal Nehru, and the mother of Rajiv Gandhi, who also became Prime Minister. Known for her tough personality, she is often referred to as the "Iron Lady."

Jawaharlal Nehru: Jawaharlal Nehru was an influential Indian leader and statesman who played a central role in India's fight for independence from colonial rule. He served as India's first prime minister for 16 years after independence in 1947. Nehru advocated for parliamentary democracy, secularism, and science and technology, shaping India's development as a modern nation. He pursued a non-aligned foreign policy during the Cold War. Nehru was also a respected author, known for books like Letters from a Father to His Daughter and The Discovery of India. He is often referred to as Pandit Nehru.

Vallabhbhai Patel: Vallabhbhai Patel, known as Sardar Patel, was a prominent leader of the Indian National Congress and played a key role in India's struggle for independence and political integration. He served as the first Deputy Prime Minister and Home Minister of India from 1947 to 1950. As Home Minister, he oversaw the political integration of India and played a crucial role in the Indo-Pakistani War of 1947.

Manmohan Singh: Manmohan Singh is an Indian politician and economist who served as India's 13th Prime Minister from 2004 to 2014. He is the third longest-serving prime minister, the first Sikh and non-Hindu to hold the position, and the first to be re-elected after a full five-year term.

Atal Bihari Vajpayee: Atal Bihari Vajpayee was an Indian politician and poet who served as the 10th Prime Minister of India for three terms. He held office for a combined period of 6 years and was the first non-Congress party prime minister to complete a full term. Vajpayee was a co-founder and senior leader of the Bharatiya Janata Party and a member of the Hindu nationalist organization RSS. He was also a celebrated Hindi poet and writer.

Benazir Bhutto: Benazir Bhutto was a Pakistani politician and stateswoman who served as Pakistan's prime minister twice. She was the first woman to lead a democratic government in a Muslim-majority nation. Bhutto was a liberal and secularist, and she played a prominent role in the Pakistan People's Party (PPP) until she was assassinated in 2007.

Muhammad Ali Jinnah: Muhammad Ali Jinnah, a barrister and politician, was the founder of Pakistan. He led the All-India Muslim League and played a pivotal role in the creation of Pakistan on August 14, 1947. After its inception, Jinnah became the first Governor-General of the Dominion of Pakistan until his death.

D. S. Senanayake: D. S. Senanayake, a Ceylonese statesman, was the first Prime Minister of Ceylon and leader of Sri Lankan independence movement. He is revered as the "Father of the Nation" for his efforts in establishing self-rule in Ceylon.

Mohammad Zahir Shah: Mohammad Zahir Shah was the last King of Afghanistan, ruling for 40 years from 1933 to 1973. He expanded diplomatic relations and modernized the country, establishing a constitutional monarchy system. His reign was characterized by peace until the Afghan conflict began.

Eduard Shevardnadze: Eduard Shevardnadze was a Soviet and Georgian politician and diplomat. He governed Georgia on multiple occasions from 1972 to 2003. Shevardnadze also served as the final Soviet Minister of Foreign Affairs from 1985 to 1990.

Ruhollah Khomeini: Ruhollah Khomeini, an Iranian Islamic revolutionary, served as the first supreme leader of Iran from 1979 until his death in 1989. He founded the Islamic Republic of Iran and led the Iranian Revolution, which overthrew the monarchy of Mohammad Reza Pahlavi.

Mohammad Mosaddegh: Mohammad Mosaddegh was the 35th Prime Minister of Iran from 1951 to 1953. He was a politician, author, and lawyer who served in the Iranian parliament for many years. His government was overthrown in 1953 in a coup aided by the intelligence agencies of the United Kingdom and the United States.

Mohammad Reza Pahlavi: Mohammad Reza Pahlavi, also known as Mohammad Reza Shah, was the last Iranian monarch who ruled from 1941 until the Iranian Revolution in 1979. He succeeded his father, Reza Shah, and held the title of Shah. He adopted the title Shahanshah in 1967 and had various other titles, including Aryamehr and Bozorg Arteshtaran.

Yasser Arafat: Yasser Arafat was a Palestinian political leader, serving as Chairman of the PLO from 1969 to 2004 and President of the PNA from 1994 to 2004. He was a founding member and leader of the Fatah political party, known for his Arab nationalist and socialist ideology.

Saddam Hussein: Saddam Hussein was an Iraqi politician and revolutionary who served as the fifth president of Iraq from 1979 to 2003. He also held positions as prime minister from 1979 to 1991 and then from 1994 to 2003. Saddam Hussein was a prominent member of the Ba'ath Party and advocated for a mix of Arab nationalism and socialism known as Ba'athism.

David Ben-Gurion: David Ben-Gurion, the primary national founder and first prime minister of Israel, immigrated to Palestine from Poland in 1906. He became a prominent leader of the Jewish community in British-ruled Mandatory Palestine from 1935 until the establishment of Israel in 1948. Ben-Gurion led Israel until 1963, with a brief break in 1954–55.

Golda Meir: Golda Meir is an Israeli politician who became the fourth prime minister of Israel from 1969 to 1974. She holds the distinction of being Israel's first female head of government and the first female head of government in the Middle East.

Charles de Gaulle: Charles de Gaulle was a French army officer and statesman who led the Free French Forces during World War II. He chaired the Provisional Government of the French Republic to restore democracy in France from 1944 to 1946. In 1958, he became Prime Minister and rewrote the Constitution, founding the Fifth Republic. He was elected President of France in the same year and served until his resignation in 1969.

François Mitterrand: François Mitterrand was a French politician who served as the President of France from 1981 to 1995, making him the longest-serving president in French history. He was the first left-wing politician to hold the presidency under the Fifth Republic, previously serving as the First Secretary of the Socialist Party.

Konrad Adenauer: Konrad Adenauer was the first chancellor of the Federal Republic of Germany from 1949 to 1963. He also founded and led the Christian Democratic Union (CDU), which became the country's dominant party during his reign.

Willy Brandt: Willy Brandt, a prominent German politician and statesman, led the Social Democratic Party of Germany (SPD) from 1964 to 1987 and served as the chancellor of West Germany from 1969 to 1974. Notably, he was awarded the Nobel Peace Prize in 1971 for his work in strengthening cooperation in western Europe and fostering reconciliation between West Germany and Eastern European nations. Brandt was also the first Social Democratic chancellor since 1930.

Helmut Kohl: Helmut Kohl was a prominent German politician who served as Chancellor of Germany from 1982 to 1998. He led the Christian Democratic Union (CDU) for 25 years, overseeing the end of the Cold War, German reunification, and the creation of the European Union (EU). Kohl's 16-year tenure is the longest of any German chancellor since Otto von Bismarck and the longest for any democratically elected German chancellor.

Angela Merkel: Angela Merkel, a former German politician and scientist, was the country's chancellor from 2005 to 2021. As the first female chancellor, she led the Christian Democratic Union and served as the leader of the Opposition. Merkel was hailed as the de facto leader of the European Union and widely recognized as the most powerful woman globally. She was also described as the leader of the free world.

Juan Carlos I: Juan Carlos I is a former King of Spain from 1975 to 2014. He is a member of the Spanish royal family and is commonly referred to as the rey emérito after his abdication.

Francisco Franco: Francisco Franco: Spanish general who led Nationalist forces during the Spanish Civil War and ruled as dictator from 1939 to 1975. His regime, commonly known as Francoist Spain, lasted until his death and was marked by authoritarian control.

António de Oliveira Salazar: António de Oliveira Salazar was a Portuguese politician who led Portugal as Prime Minister from 1932 to 1968. He transformed the dictatorship of the Ditadura Nacional into the corporatist regime known as Estado Novo, where he held dictatorial power. This authoritarian regime remained in place until 1974, making it one of Europe's longest-lasting authoritarian governments.

Gro Harlem Brundtland: Gro Harlem Brundtland, a Norwegian politician, was the 29th prime minister of Norway and leader of the Labour Party from 1981 to 1992. She also served as the director-general of the World Health Organization from 1998 to 2003 and chaired the Brundtland Commission, which presented the influential Brundtland Report on sustainable development.

Dag Hammarskjöld: Dag Hammarskjöld was a Swedish economist and diplomat who served as the youngest Secretary-General of the United Nations from 1953 to 1961 until his death in a plane crash. He was appointed at the age of 47 and was the son of former Prime Minister Hjalmar Hammarskjöld.

Elizabeth II: Elizabeth II was the Queen of the United Kingdom and other Commonwealth realms from 1952 until her death in 2022. She served as queen regnant of 32 sovereign states and remained the monarch of 15 realms at the time of her death. Her reign of over 70 years is the longest among British monarchs and the second longest in history.

Clement Attlee: Clement Attlee, 1st Earl Attlee, was a prominent British politician who served as Prime Minister from 1945 to 1951. He was also the leader of the Labour Party from 1935 to 1955, making him their longest-serving leader. Attlee played a crucial role as Deputy Prime Minister during World War II. Historians and the public widely regard him as one of the UK's greatest Prime Ministers.

Margaret Thatcher: Margaret Thatcher, Baroness Thatcher, was a British stateswoman and Conservative politician. She was Prime Minister of the United Kingdom from 1979 to 1990, making her the longest-serving British prime minister of the 20th century. Thatcher was also the first woman to hold this position. She was known for implementing economic policies known as Thatcherism and had an uncompromising leadership style, earning her the nickname "Iron Lady".

Alexander Dubček: Alexander Dubček was a Slovak statesman who led significant reforms during the Prague Spring in Czechoslovakia from January 1968 to April 1969. However, these reforms were reversed after the Warsaw Pact invasion in August 1968. He later became Chairman of the Federal Assembly from 1989 to 1992 following the Velvet Revolution.

Václav Havel: Václav Havel was a Czech statesman, author, poet, playwright, and dissident. He served as the last president of Czechoslovakia from 1989 to 1992 and the first president of the Czech Republic from 1993 to 2003. Notably, he was the first democratically elected president after the fall of communism. Havel is recognized for his significant contributions to Czech literature through his plays, essays, and memoirs.

Erich Honecker: Erich Honecker was a German communist politician who led East Germany from 1971 to 1989. He held key positions in the Socialist Unity Party of Germany and National Defence Council. Known as a dictator, Honecker had close ties with the Soviet Union, which stationed a large army in East Germany.

Lech Wałęsa: Lech Wałęsa is a prominent Polish statesman and dissident who served as the president of Poland from 1990 to 1995. He was the first democratically elected president of Poland since 1926, leading a successful pro-democratic effort that ended Communist rule in Poland and contributed to the end of the Cold War. Prior to his political career, Wałęsa was an electrician and rose to prominence as the leader of the Solidarity movement. He was awarded the Nobel Peace Prize for his advocacy of human rights and democratic values.

Vladimir Putin: Vladimir Putin, a Russian politician and former intelligence officer, has been the President of Russia since 2000, with a brief period as Prime Minister. He is currently the longest-serving Russian leader since Joseph Stalin.

Boris Yeltsin: Boris Yeltsin, a Soviet and Russian politician, served as the first President of Russia from 1991 to 1999. Initially a member of the Communist Party, he later became politically independent and aligned with liberalism.

Leonid Brezhnev: Leonid Brezhnev was a Soviet politician who served as General Secretary of the Communist Party of the Soviet Union for 18 years. While his rule was marked by political stability and foreign policy achievements, it was also plagued by corruption, inefficiency, economic stagnation, and technological gaps with the West.

Mikhail Gorbachev: Mikhail Gorbachev was a Soviet and Russian politician who led the Soviet Union from 1985 until its dissolution in 1991. He served as General Secretary of the Communist Party and later became the country's President. Gorbachev shifted from Marxism-Leninism to social democracy during his leadership.

Nikita Khrushchev: Nikita Khrushchev was a Soviet leader who served as the first secretary of the Communist Party and chairman of the Council of Ministers. He shocked the communist world by condemning Stalin's crimes and initiating de-Stalinization. Khrushchev also supported the Soviet space program, implemented moderate domestic reforms, and successfully negotiated to ease Cold War tensions with the United States. However, he was eventually ousted from power in 1964 and replaced by Leonid Brezhnev.

Nicolae Ceaușescu: Nicolae Ceaușescu, a Romanian communist politician, was the general secretary of the Romanian Communist Party from 1965 to 1989 and the country's head of state from 1967. He was widely considered a dictator and served as President of the State Council and President of the Republic until his overthrow and execution during the Romanian Revolution in December 1989.

Enver Hoxha: Enver Hoxha was a Communist dictator who ruled Albania from 1944 until his death in 1985. He was the First Secretary of the Party of Labour, chairman of the Democratic Front, and commander-in-chief of the Albanian People's Army. Hoxha also served as the prime minister, foreign minister, and defence minister of Albania.

Slobodan Milošević: Slobodan Milošević was a Serbian-Yugoslav politician who served as the president of Serbia from 1989 to 1997 and the Federal Republic of Yugoslavia from 1997 to 2000. He led the Socialist Party of Serbia and played a significant role in the Yugoslav Wars. Under his regime, protests and desertions from the Yugoslav People's Army occurred, leading to mass emigration from Serbia. Milošević was charged by the International Criminal Tribunal for war crimes during the Bosnian, Croatian, and Kosovo conflicts, becoming the first sitting head of state to face such charges.

Josip Broz Tito: Josip Broz, also known as Tito, was a Yugoslav communist revolutionary, politician, and leader of the Yugoslav Partisans during World War II. He held various national leadership positions from 1943 until his death in 1980, including prime minister and president of the Socialist Federal Republic of Yugoslavia. Tito's ideology and policies, known as Titoism, shaped Yugoslavia's political landscape.

Hannibal: Hannibal, a Carthaginian general, led Carthage against Rome in the Second Punic War.

Sun Tzu: Sun Tzu, a Chinese military general, strategist, philosopher, and writer during the Eastern Zhou period, is traditionally credited as the author of The Art of War. This influential work has had a profound impact on both Western and East Asian philosophy and military thought. Sun Tzu is held in high esteem in Chinese and East Asian cultures as a legendary historical and military figure. His birth name was Sun Wu, but he was commonly referred to as Sun Tzu, meaning "Master Sun."

Zhuge Liang: Zhuge Liang, also known as Kongming, was a prominent Chinese statesman, strategist, and engineer. He played a significant role during the Three Kingdoms period, serving as the Imperial Chancellor of Shu Han and later as regent until his death in 234.

Aetius (magister militum): Aetius, a Roman general and statesman, was a powerful figure during the decline of the Western Roman Empire. He controlled military and political decisions for 20 years, effectively dealing with attacks from barbarian federates. A notable achievement was his leadership in the Battle of the Catalaunian Plains in 451, halting Attila's devastating invasion of Gaul. However, Attila later invaded Italy, resulting in the notorious Sack of Aquileia and the intervention of Pope Leo I.

Mark Antony: Mark Antony, or Marcus Antonius, was a Roman politician and general. He played a crucial role in turning the Roman Republic into the autocratic Roman Empire.

Pompey: Pompey, also called Pompey the Great, was a Roman general and statesman who played a crucial role in the transition of Rome from republic to empire. Initially a follower of Sulla, he later became allies with Julius Caesar before turning into his enemy.

Scipio Africanus: Scipio Africanus, a Roman general and statesman, played a crucial role in Rome's triumph over Carthage during the Second Punic War. Renowned as a brilliant military strategist, his greatest accomplishment was defeating Hannibal at the Battle of Zama in 202 BC. This victory earned him the title Africanus, symbolizing his conquest of Africa.

Sulla: Sulla, or Lucius Cornelius Sulla Felix, was a Roman general and statesman known for winning the first major civil war in Roman history. He became the first person in the Republic to seize power through force.

Leonidas I: Leonidas I, a king of Sparta, descended from the mythical demigod Heracles. He ruled from 489 BC, succeeding his half-brother Cleomenes I, and his co-ruler was Leotychidas. His son, Pleistarchus, succeeded him.

Subutai: Subutai, a Mongol general, was the chief military strategist for Genghis Khan and Ögedei Khan. His 20+ campaigns led to the conquest of more territory than any other commander in history. With sophisticated strategies, he coordinated armies operating hundreds of kilometers apart and achieved victories. Subutai's expeditions covered a wide range, from central Asia to the Russian steppe and Europe. He is considered one of the greatest military commanders and strategists of the early Mongol expansion.

Trần Hưng Đạo: Trần Hưng Đạo, also known as Grand Prince Hưng Đạo, was a Vietnamese prince, statesman, and military commander during the Trần dynasty. He led the Vietnamese armies that successfully defended against two of three major Mongol invasions in the late 13th century. His victories over the Yuan dynasty under Kublai Khan are considered significant military achievements in Vietnamese history.

John Hunyadi: John Hunyadi was a prominent 15th-century Hungarian military leader. He hailed from a Wallachian noble family and gained military expertise defending Hungary's southern border against Ottoman attacks. In 1441, he was appointed voivode of Transylvania and took charge of frontier defense.

Jan Žižka: Jan Žižka, a Czech general and follower of Jan Hus, was a Radical Hussite who led the Taborites. Despite being blind, he successfully led the Hussite forces against three crusades, never losing a battle. Žižka is a Czech national hero and was nicknamed "One-eyed Žižka".

Amr ibn al-As: Amr ibn al-As, an Arab commander, led the Muslim conquest of Egypt and governed it twice between 640 and 664. He embraced Islam in 629 and played important roles in the early Muslim community. Appointed by the first caliph, he conquered and governed Palestine, achieving decisive victories over the Byzantines in 634 and 636.

Khalid ibn al-Walid: Khalid ibn al-Walid was a prominent 7th-century Arab military commander who first fought against Muhammad but later converted to Islam. He played a crucial role in the Ridda Wars, campaigns in Sasanian Iraq, and the conquest of Byzantine Syria. He served under the first two Rashidun caliphs, Abu Bakr and Umar.

El Cid: El Cid was a medieval Spanish knight who fought for both Christian and Muslim armies. He was born in Vivar near Burgos. El Cid became a powerful ruler in the Levante region of Spain in the 11th century. He briefly reclaimed Valencia from Muslim control during the Reconquista. His wife, Jimena Díaz, inherited the city and held it until it was reconquered by the Moors in 1102.

Godfrey of Bouillon: Godfrey of Bouillon was a leader of the First Crusade and the first ruler of the Kingdom of Jerusalem. He avoided the title of king and preferred to be called prince and Advocate of the Holy Sepulchre. He became Duke of Lower Lorraine in 1087. Godfrey, along with his brothers, joined the First Crusade and played a significant role in capturing Jerusalem in 1099. He accepted the role of ruler when it was declined by Raymond IV and secured his kingdom by defeating the Fatimids at Ascalon. Godfrey died in 1100 and was succeeded by his brother Baldwin as King of Jerusalem.

Joan of Arc: Joan of Arc, a patron saint of France, defended the nation during the Hundred Years' War. She led the siege of Orléans and insisted on the coronation of Charles VII as the rightful king. Guided by divine inspiration, Joan defied gender norms and became a renowned military leader, earning recognition as a savior of France.

William Wallace: William Wallace was a Scottish knight and a prominent leader during the First War of Scottish Independence.

Hernán Cortés: Hernán Cortés was a Spanish conquistador who led the expedition that conquered the Aztec Empire in the early 16th century. He brought large parts of mainland Mexico under Spanish rule, playing a significant role in the first phase of Spanish colonization in the Americas.

Francisco Pizarro: Francisco Pizarro, a Spanish conquistador, conquered the Inca Empire through his expeditions.

Hayreddin Barbarossa: Hayreddin Barbarossa, also called Hayreddin Pasha or Hızır Reis, was an Ottoman corsair and admiral. Through his naval victories, he established Ottoman control over the Mediterranean in the 16th century.

Miyamoto Musashi: Miyamoto Musashi was a legendary Japanese swordsman who gained fame for his unparalleled double-bladed sword skills and undefeated record in 61 duels. He was also a philosopher, strategist, writer, and rōnin. Musashi, nicknamed Kensei, founded the Niten Ichi-ryū style of swordsmanship and wrote The Book of Five Rings and Dokkōdō in his later years.

Yi Sun-sin: Yi Sun-sin was a renowned Korean admiral and military general known for his triumphs against the Japanese navy during the Imjin war in the Joseon Dynasty.

John Churchill, 1st Duke of Marlborough: John Churchill, 1st Duke of Marlborough, was an English soldier and statesman. He rose through the ranks due to his bravery and diplomatic abilities. Known for his success in battle, he never lost a single one.

Francis Drake: Francis Drake, an English explorer and privateer, achieved the first English circumnavigation of the world from 1577 to 1580. He began his career as a seaman and later played a crucial role as a vice-admiral in the battle against the Spanish Armada in 1588.

Horatio Nelson, 1st Viscount Nelson: Horatio Nelson, 1st Viscount Nelson, was a British flag officer in the Royal Navy during the French Revolutionary and Napoleonic Wars. Known for his exceptional leadership, strategic acumen, and unorthodox tactics, he achieved numerous significant victories. Nelson's most renowned success occurred on October 21, 1805, at the Battle of Trafalgar, where his triumph secured British naval dominance for more than a century.

Arthur Wellesley, 1st Duke of Wellington: Arthur Wellesley, 1st Duke of Wellington, was a British statesman, soldier, and Tory politician. He played a crucial role in the Napoleonic Wars and won the Battle of Waterloo in 1815. He served as prime minister of the United Kingdom twice and is considered one of the prominent military and political figures of 19th-century Britain.

Prince Eugene of Savoy: Prince Eugene of Savoy was a skilled military leader who served in the Army of the Holy Roman Empire and the Austrian Habsburg dynasty. He achieved great success and held high-ranking positions at the Imperial court in Vienna.

Michiel de Ruyter: Michiel de Ruyter – Dutch admiral, renowned for his exceptional leadership and skills in the Dutch Navy during the Anglo-Dutch Wars. Regarded as one of the most accomplished naval commanders in history.

Alexander Suvorov: Alexander Suvorov was a Russian general and military theorist who served the Russian Empire and the Habsburg monarchy. He was known for his brilliant military strategies and never lost a battle he commanded. Suvorov held several titles and honors, including Prince of Italy and Prince or Knyaz of the Russian Empire. He expanded Russia's borders, revived its military reputation, and left a legacy of warfare theories. Suvorov authored military manuals, including The Science of Victory, and is considered one of the greatest military commanders in Russian history. He won a total of 63 battles without a major defeat and elevated Russian military glory. Various institutes, monuments, and orders in Russia are dedicated to him.

Afonso de Albuquerque: Afonso de Albuquerque, 1st Duke of Goa, was a Portuguese general, admiral, and statesman. He was the viceroy of Portuguese India from 1509 to 1515, expanding Portuguese influence in the Indian Ocean. Known for his military prowess, he built a reputation as a fierce and skilled commander.

Fernando Álvarez de Toledo, 3rd Duke of Alba: Fernando Álvarez de Toledo, 3rd Duke of Alba, was a Spanish noble, general, and diplomat. Known as the Grand Duke of Alba in Spain and Portugal, and the Iron Duke in the Netherlands, he played a significant role in the Eighty Years' War. However, his brutal military campaigns and repressive tactics failed to quell the Dutch Revolt.

Ulysses S. Grant: Ulysses S. Grant was the 18th president of the United States, serving from 1869 to 1877. He successfully led the Union Army to victory during the American Civil War as its commanding general. Grant also briefly served as the U.S. secretary of war. As president, he played a significant role in advancing civil rights, signing the bill that established the Justice Department and working with Radical Republicans to protect African Americans during Reconstruction.

Robert E. Lee: Robert E. Lee was a highly regarded Confederate general in the American Civil War. He commanded the powerful Army of Northern Virginia and is known for his tactical expertise. He led the Confederacy's forces from 1862 until their surrender in 1865.

Douglas MacArthur: Douglas MacArthur was a distinguished American military leader who served as a General in the United States Army and as a field marshal in the Philippine Army. He had notable roles in World War I, as Chief of Staff of the United States Army in the 1930s, and in the Pacific theater during World War II. MacArthur received the Medal of Honor for his service in the Philippines campaign, becoming the first father and son to be awarded this honor. He held the rank of General of the Army in the U.S. Army, one of only five men to attain this rank, and was also conferred the rank of field marshal in the Philippine Army.

Alfred Thayer Mahan: Alfred Thayer Mahan, a US naval officer and historian, was an influential strategist in the 19th century. His book on the impact of sea power, starting with The Influence of Sea Power Upon History, gained immediate recognition, making him renowned worldwide.

George C. Marshall: George C. Marshall was an influential American army officer and statesman. He served as Chief of Staff of the U.S. Army and later as Secretary of State and Secretary of Defense. Winston Churchill credited him as the "organizer of victory" for his role in leading the Allies to victory in World War II. Marshall also tried but failed to prevent the Chinese Civil War. As Secretary of State, he championed the Marshall Plan, a crucial initiative for European recovery after the war. Marshall's significant contributions earned him the Nobel Peace Prize in 1953, making him the only Army general to ever receive this honor.

Enver Pasha: Enver Pasha, also known as İsmail Enver, was an Ottoman military officer and revolutionary. He played a key role as one of the "Three Pashas," a dictatorial triumvirate in the Ottoman Empire. Enver Pasha was later convicted as a war criminal.

Võ Nguyên Giáp: Võ Nguyên Giáp, a self-taught military genius, played a pivotal role in Vietnam's communist forces. He led the Việt Minh and later the People's Army of Vietnam (PAVN) from 1941 to 1972. Giáp was the Minister of Defense and Deputy Prime Minister, serving his country until 1991. Known as one of the greatest military strategists of the 20th century, Giáp's remarkable legacy remains as a key member of the Communist Party of Vietnam.

Isoroku Yamamoto: Isoroku Yamamoto was a Japanese Marshal Admiral in World War II, leading the Imperial Japanese Navy's Combined Fleet.

Giuseppe Garibaldi: Giuseppe Garibaldi was an Italian general and patriot who played a vital role in the unification of Italy, ultimately forming the Kingdom of Italy. He is considered one of Italy's national heroes, alongside key figures like Cavour and Mazzini. Garibaldi earned the title "Hero of the Two Worlds" due to his military exploits in both South America and Europe.

Robert Baden-Powell, 1st Baron Baden-Powell: Robert Baden-Powell, 1st Baron Baden-Powell, was a British Army officer, writer, and founder of the Scout Movement. He also established the Girl Guide/Girl Scout Movement with his sister. Baden-Powell authored the influential book Scouting for Boys, which inspired the Scout Movement.

T. E. Lawrence: T.E. Lawrence, also known as Lawrence of Arabia, was a British archaeologist, army officer, diplomat, and writer. He gained international fame for his role in the Arab Revolt and the Sinai and Palestine Campaign against the Ottoman Empire during World War I. Lawrence's diverse activities and persuasive writing skills contributed to his renown.

Bernard Montgomery: Bernard Montgomery, 1st Viscount Montgomery of Alamein, known as "Monty," was a prominent British Field Marshal. He served in the First and Second World Wars, as well as the Irish War of Independence.

Carl von Clausewitz: Carl von Clausewitz was a Prussian general and military theorist known for emphasizing the moral and political aspects of war. His unfinished work, Vom Kriege, is highly regarded as a fundamental treatise on military strategy and science.

Hermann Göring: Hermann Göring, a German politician and military leader, was a key figure in the Nazi Party, known for his immense power. He was convicted as a war criminal and played a significant role in Germany's governance during the Nazi regime from 1933 to 1945.

Paul von Hindenburg: Paul von Hindenburg was a German field marshal and statesman who led the Imperial German Army in World War I. He later became president of Germany until his death. During his presidency, he played a significant role in the Nazi seizure of power by appointing Adolf Hitler as chancellor in 1933.

Erich Ludendorff: Erich Ludendorff, a German general and military theorist, played a crucial role in Germany's victories at Liège and Tannenberg during World War I. Later, as First Quartermaster General, he became the chief policymaker in a military dictatorship that ruled Germany. After Germany's defeat, Ludendorff played a significant role in the Nazis' rise to power.

Helmuth von Moltke the Elder: Helmuth von Moltke the Elder was a Prussian field marshal and chief of staff, known for revolutionizing military tactics. He commanded troops in several wars and was skilled in organizing armies. He pioneered the military use of railways and is considered a military genius. He is often referred to as Moltke the Elder to differentiate him from his nephew. Interestingly, he is the earliest-born person to be audio-recorded, with two of his recordings preserved from 1889.

Erwin Rommel: Erwin Rommel, also known as the Desert Fox, was a prominent German general during World War II. He served in the Wehrmacht, the Reichswehr, and the army of Imperial Germany. Rommel sustained injuries in both world wars.

Georgy Zhukov: Georgy Zhukov, a Marshal of the Soviet Union, was a renowned military leader during World War II. He led the Red Army to several significant victories and served as the Chief of the General Staff, Minister of Defence, and a member of the Communist Party's Presidium. Additionally, he played the role of military governor of Germany before being succeeded by Wilhelm Pieck.

Spartacus: Spartacus was a Thracian gladiator and one of the leaders of the Third Servile War, a major slave uprising against the Roman Republic. He and other escaped slaves led the rebellion, and although little is known about him, historical accounts agree that he was a skilled military leader and former gladiator.

Abu Muslim: Abu Muslim was a Persian general who led the Abbasid Revolution, which resulted in the downfall of the Umayyad dynasty and the rise of the Abbasid Caliphate.

Babak Khorramdin: Babak Khorramdin was a prominent Iranian revolutionary leader who led a local freedom movement called Iranian Khorram-Dinān. They fought against the Abbasid Caliphate, advocating for a return to the political glory of Iran's past. The rebellion spread across Western and Central Iran and lasted over two decades before being betrayed and defeated. Babak's uprising showcased the enduring strength of ancestral Iranian sentiments in Azerbaijan.

Huang Chao: Huang Chao, a Chinese rebel, led a significant rebellion that greatly weakened the Tang dynasty.

Bartolomé de las Casas: Bartolomé de las Casas was a Spanish clergyman and writer known for his work as a historian and social reformer. He became a Dominican friar and was appointed as the first resident Bishop of Chiapas, known as the "Protector of the Indians." His writings, including A Short Account of the Destruction of the Indies and Historia de Las Indias, exposed the atrocities committed by colonizers against indigenous peoples during the colonization of the West Indies.

Blackbeard: Blackbeard, or Edward Teach, was an English pirate who operated in the West Indies and British North American colonies in the early 18th century. He started as a sailor during Queen Anne's War and later settled on the Bahamian island of New Providence, joining Captain Benjamin Hornigold's crew. Given command of a sloop, they engaged in piracy. Eventually, they gained two more ships, one commanded by Stede Bonnet. However, Hornigold retired with two vessels in 1717.

William Wilberforce: William Wilberforce was a British politician and philanthropist. He led the movement to abolish the slave trade and served as an independent Member of Parliament for Yorkshire. He underwent a religious conversion and became an Evangelical Anglican, which led to his lifelong dedication to reform.

Thomas Müntzer: Thomas Müntzer was a German preacher and theologian who opposed both Martin Luther and the Roman Catholic Church. He openly defied late-feudal authority and played a leading role in the German Peasants' War of 1525.

Yemelyan Pugachev: Yemelyan Pugachev was a leader of the Pugachev's Rebellion, a major uprising in the Russian Empire during Catherine the Great's reign. He was an ataman of the Yaik Cossacks and played a significant role in this popular rebellion.

Georges Danton: Georges Jacques Danton, a French lawyer, played a significant role in the French Revolution. He was a leading figure in the Paris Commune, known for his oratory skills at the Cordeliers Club. After the monarchy fell in 1792, he became the Minister of Justice and was rumored to have incited the September Massacres. He later became the first president of the Committee of Public Safety and was sent to Belgium on a diplomatic mission.

Jean-Paul Marat: Jean-Paul Marat, a French political theorist and scientist, was a journalist and politician during the French Revolution. He strongly supported the sans-culottes, publishing his radical views in various forms of media. His periodical L'Ami du peuple established him as a connection to the powerful Jacobin group that rose to dominance in June 1793.

Maximilien Robespierre: Maximilien Robespierre was a prominent French lawyer and statesman during the French Revolution. He played a key role in the downfall of the French monarchy and the establishment of the National Convention. Robespierre aimed to create a united France with equality under the law, eradicating privileges and supporting direct democracy.

Steve Biko: Steve Biko was a prominent anti-apartheid activist from South Africa. He championed the Black Consciousness Movement and fought against racial segregation. Biko's ideologies centered around African nationalism and socialism, which he expressed through articles published under the pseudonym Frank Talk.

Patrice Lumumba: Patrice Lumumba, born Isaïe Tasumbu Tawosa, was a Congolese politician and independence leader. He became the first prime minister of the Democratic Republic of the Congo in June 1960 after the May 1960 election. Lumumba was the leader of the Congolese National Movement (MNC) from 1958 until his execution in January 1961. He was an African nationalist and pan-Africanist, playing a crucial role in the transformation of Congo's independence from Belgium.

Sayyid Qutb: Sayyid Qutb was an Egyptian scholar, author, and a prominent member of the Egyptian Muslim Brotherhood. He was convicted of plotting to assassinate President Gamal Abdel Nasser and was executed in 1966. Qutb is known as "the Father of Salafi jihadism" which influenced the ideological foundation of extremist groups like al-Qaeda and ISIL.

Thomas Sankara: Thomas Sankara, a Burkinabè military officer and Marxist revolutionary, served as President of Burkina Faso from 1983 until his assassination in 1987. He is revered as a charismatic and iconic figure of the revolution.

Ken Saro-Wiwa: Ken Saro-Wiwa, a Nigerian writer, TV producer, and environmental activist, was a member of the Ogoni people, a minority group in Nigeria. He fought against crude oil extraction in their homeland, Ogoniland, which suffered severe environmental damage from decades of petroleum waste dumping in the Niger Delta.

Louis Riel: Louis Riel, a Canadian politician and founder of Manitoba, was a prominent leader of the Métis people. He fought against the Government of Canada and Prime Minister John A. Macdonald, leading two resistance movements in defense of Métis rights and identity. Riel's actions were driven by his desire to preserve Métis heritage as the Northwest Territories fell under Canadian influence.

Marcus Garvey: Marcus Garvey was a Jamaican political activist and the founder of the Universal Negro Improvement Association and African Communities League. He declared himself Provisional President of Africa and advocated for black nationalism and Pan-Africanism, which became known as Garveyism.

Che Guevara: 'Che Guevara' refers to Ernesto "Che" Guevara, an Argentine revolutionary, diplomat, and author. He played a significant role in the Cuban Revolution and is now an iconic symbol of rebellion and counterculture worldwide.

Miguel Hidalgo y Costilla: Miguel Hidalgo y Costilla, also known as Miguel Hidalgo, was a Catholic priest who led the Mexican War of Independence. He is celebrated as the Father of the Nation in Mexico.

Pancho Villa: Pancho Villa was a Mexican general during the Revolution. He played a crucial role in overthrowing President Porfirio Díaz and bringing Francisco Madero to power in 1911. After Madero's removal by General Huerta in 1913, Villa joined the anti-Huerta forces and later clashed with Carranza. Villa allied with Emiliano Zapata and sought land reform but didn't implement it when in power. In late 1914, Villa gained significant popularity and the US contemplated recognizing him as Mexico's legitimate authority.

Emiliano Zapata: Emiliano Zapata was a prominent Mexican revolutionary and key leader during the Mexican Revolution. He spearheaded the people's revolution in Morelos and inspired the agrarian movement known as Zapatismo.

Jane Addams: Jane Addams was an influential American activist, author, and social worker in the late 19th and early 20th centuries. She co-founded Chicago's Hull House, a renowned settlement house that assisted immigrant families. Addams played a pivotal role in social work and women's suffrage movements, and was the first woman to receive an honorary degree from Yale University. She also co-founded the American Civil Liberties Union (ACLU) in 1920.

Susan B. Anthony: Susan B. Anthony was a prominent American activist for women's rights and social reform. She was a key figure in the women's suffrage movement and was born into a Quaker family dedicated to equality. At just 17 years old, she started collecting anti-slavery petitions. Later, in 1856, Anthony became the New York state agent for the American Anti-Slavery Society.

Frederick Douglass: Frederick Douglass was a prominent American social reformer, abolitionist, writer, and statesman who played a crucial role in advocating for African-American civil rights in the 19th century.

Betty Friedan: Betty Friedan was an influential American feminist writer and activist. Her book The Feminine Mystique, published in 1963, is widely recognized for its role in igniting the second wave of American feminism. In 1966, Friedan co-founded the National Organization for Women (NOW) and became its first president, advocating for gender equality and women's full participation in American society.

Helen Keller: Helen Keller, an American author and disability rights advocate, overcame her deafblindness to become the first person in the US with these impairments to earn a Bachelor of Arts degree. With the help of her lifelong teacher, Anne Sullivan, Keller learned to communicate and attend school, ultimately attending Radcliffe College.

Martin Luther King Jr.: Martin Luther King Jr. was an American Christian minister, activist, and political philosopher who played a pivotal role in the civil rights movement from 1955 to 1968. He advocated for civil rights through nonviolent resistance and civil disobedience against discrimination in the US, particularly Jim Crow laws. King's assassination in 1968 marked a tragic end to his influential leadership.

Harvey Milk: Harvey Milk was the first openly gay man to be elected to public office in California. He was a politician who served on the San Francisco Board of Supervisors. Milk was born and raised in New York, where he embraced his homosexuality during adolescence but remained discreet in his adult life. His countercultural experiences in the 1960s led him to challenge his conservative views on individual freedom and sexual expression.

John Muir: John Muir, "John of the Mountains" and "Father of the National Parks," was a Scottish-born American naturalist, author, and advocate for preserving wilderness in the United States.

Rosa Parks: Rosa Parks was an American civil rights activist known for her pivotal role in the Montgomery bus boycott. She joined the NAACP in 1943 and participated in various civil rights campaigns. In 1955, Parks refused to give up her seat on a bus to a white passenger. Her arrest inspired the Black community to boycott Montgomery buses for over a year. The subsequent court case, Browder v. Gayle, resulted in a 1956 ruling that bus segregation is unconstitutional. Parks is honored as "the first lady of civil rights" and "the mother of the freedom movement."

Margaret Sanger: Margaret Sanger, an American activist and nurse, pioneered the concept of birth control, opened the first US clinic, and founded organizations that evolved into Planned Parenthood.

Elizabeth Cady Stanton: Elizabeth Cady Stanton, an American writer and activist, was a prominent leader of the women's rights movement in the mid- to late-19th century. She spearheaded the historic 1848 Seneca Falls Convention, advocating for women's rights and authoring the influential Declaration of Sentiments. Stanton's passionate demand for women's suffrage provoked both controversy and widespread support, becoming a key principle of the women's movement. Aside from her pivotal role in women's rights, she actively participated in social reform, particularly abolitionism.

Sojourner Truth: Sojourner Truth, an American abolitionist and civil rights activist, fought for African-American and women's rights as well as alcohol temperance. Born into slavery, she escaped in 1826 and later became the first black woman to win a legal case against a white man, establishing an important precedent.

Harriet Tubman: Harriet Tubman was an American abolitionist and social activist who rescued around 70 enslaved people through the Underground Railroad. During the Civil War, she served as an armed scout and spy for the Union Army. She also fought for women's suffrage later in her life.

Booker T. Washington: Booker T. Washington was a prominent African-American educator, author, and speaker who held significant influence within the black community from 1890 to 1915. He was a leading figure among the contemporary Black elite.

Malcolm X: Malcolm X was an influential American Muslim minister and civil rights activist. He played a significant role in the civil rights movement, particularly as a spokesperson for the Nation of Islam until 1964. Malcolm X advocated for Black empowerment and the spread of Islam in the Black community. In 1965, a posthumous autobiography written with Alex Haley was published.

B. R. Ambedkar: B. R. Ambedkar was an Indian jurist, economist, social reformer, and political leader. He spearheaded the drafting of India's constitution and served as the Law and Justice minister. Ambedkar inspired the Dalit Buddhist movement after renouncing Hinduism.

Aung San: Aung San: Burmese politician, independence activist, and revolutionary. Instrumental in Myanmar's fight against British rule. Assassinated just before achieving independence. Founder of modern-day Myanmar and the Tatmadaw. Referred to as "Father of the Nation," "Father of Independence," and "Father of the Tatmadaw."

Aung San Suu Kyi: Aung San Suu Kyi, also known as Suu Kyi, is a prominent Burmese politician, diplomat, and author. She was awarded the Nobel Peace Prize in 1991. Suu Kyi served as State Counsellor of Myanmar and Minister of Foreign Affairs from 2016 to 2021. She has been the general secretary of the National League for Democracy since its founding in 1988. Suu Kyi played a significant role in Myanmar's transition from military rule to a partial democracy in the 2010s.

Subhas Chandra Bose: Subhas Chandra Bose, an Indian nationalist, became a hero for defying British rule in India. However, his alliances with Nazi Germany and Imperial Japan created controversy due to authoritarianism, anti-Semitism, and military failures. He was honored with the title "Netaji" by Indian soldiers and officials in Germany in 1942, and this title is now widely used in India.

Diponegoro: Diponegoro, a Javanese prince, strongly opposed Dutch colonization in the 19th century. He played a significant role in the Java War from 1825 to 1830. Following his defeat, he was imprisoned in Makassar and died there at the age of 69.

Mahatma Gandhi: Mahatma Gandhi, an Indian lawyer and anti-colonial nationalist, led India to independence from British rule through nonviolent resistance. He inspired global movements for civil rights and freedom. The honorific Mahātmā, initially given to him in South Africa in 1914, is now recognized worldwide.

Hong Xiuquan: Hong Xiuquan, a Chinese revolutionary and religious leader, waged the Taiping Rebellion against the Qing dynasty. Known as the "Heavenly King," he founded the Taiping Heavenly Kingdom, ruling vast regions of southern China.

Rani of Jhansi: The Rani of Jhansi, Lakshmibai Newalkar, was the wife of Maharaja Gangadhar Rao Newalkar of Jhansi in the Maratha Empire. She played a prominent role in the Indian Rebellion of 1857 and is revered as a national hero and symbol of resistance against British rule in India.

José Rizal: José Rizal was a Filipino nationalist, writer, and polymath during the Spanish colonial period in the Philippines. He is recognized as a national hero. Originally an ophthalmologist, Rizal became a prominent writer and a leading figure in the Filipino Propaganda Movement, which sought political reforms under Spanish rule.

Sun Yat-sen: Sun Yat-sen was a Chinese revolutionary and political leader who played a significant role in the overthrow of the Qing dynasty during the 1911 Revolution. He served as the first provisional president of the Republic of China and was the founder of the Kuomintang. Known as the "Father of the Nation" in Taiwan and the "Forerunner of the Revolution" in mainland China, Sun is respected by both the Communist Party and the Nationalist Party for his contributions to Chinese history.

Bal Gangadhar Tilak: Bal Gangadhar Tilak, also known as Lokmanya, was an Indian nationalist and freedom fighter. He was a prominent leader in the Lal Bal Pal trio and was recognized as the "father of the Indian unrest" by British authorities. Tilak was revered as the "Maker of Modern India" by Mahatma Gandhi and was honored with the title "Lokmanya", meaning "accepted leader of the people".

Henry Dunant: Henry Dunant, a Swiss humanitarian and founder of Red Cross, was awarded the first Nobel Peace Prize in 1901 for his notable social activism and efforts in promoting humanitarian aid.

Emma Goldman: Emma Goldman was a Lithuanian-born writer, political activist, and revolutionary known for her influential contributions to anarchist political philosophy in North America and Europe during the first half of the 20th century.

Theodor Herzl: Theodor Herzl, an Austro-Hungarian Jewish journalist and activist, was the founding figure of modern political Zionism. He established the Zionist Organization and advocated for Jewish immigration to Palestine with the aim of establishing a Jewish state.

Rosa Luxemburg: Rosa Luxemburg, a Polish-German revolutionary socialist, was a prominent figure in the socialist movements of Poland and Germany in the late 19th and early 20th centuries. She was a staunch anti-war activist and an influential orthodox Marxist.

Emmeline Pankhurst: Emmeline Pankhurst, a notable British activist, organized the suffragette movement in the UK and played a crucial role in securing women's right to vote. Recognized as one of the 100 Most Important People of the 20th Century by Time in 1999, her efforts prompted societal change that was irreversible. While her militant tactics received criticism and their effectiveness remains debated among historians, Pankhurst's work remains acknowledged as a fundamental factor in achieving women's suffrage in the United Kingdom.

Apollonius of Perga: Apollonius of Perga, an ancient Greek geometer and astronomer, advanced the work of Euclid and Archimedes, bringing conic sections to a state prior to the invention of analytic geometry. He provided definitions for the terms ellipse, parabola, and hyperbola that are still used today. Apollonius is recognized as one of the greatest mathematicians of antiquity.

Archimedes: Archimedes of Syracuse, an Ancient Greek mathematician, physicist, engineer, astronomer, and inventor, is considered one of the greatest scientists in classical antiquity. He is renowned for his contributions in mathematics, where he anticipated modern calculus and analysis through the concept of the infinitely small. Archimedes rigorously derived and proved various geometrical theorems, such as the area of a circle, surface area and volume of a sphere, and area under a parabola.

Diophantus: Diophantus of Alexandria, a Greek mathematician, wrote the Arithmetica series of books, known for their focus on solving algebraic equations.

Eratosthenes: Eratosthenes of Cyrene was a Greek polymath who excelled in various fields such as mathematics, geography, poetry, astronomy, and music theory. He held the position of chief librarian at the prestigious Library of Alexandria and his work contributed significantly to the study of geography. He also introduced terminology that continues to be used in the field today.

Euclid: Euclid was an ancient Greek mathematician known as the "father of geometry." His Elements treatise laid the foundations of geometry, which dominated the field until the 19th century. Euclidean geometry combined innovations and theories from earlier Greek mathematicians. He is considered one of the greatest mathematicians of antiquity and had a significant impact on the history of mathematics.

Galen: Galen, a Roman Greek physician, surgeon, and philosopher, was a highly accomplished medical researcher of antiquity. His influence extended to many scientific disciplines including anatomy, physiology, pathology, pharmacology, and neurology. Galen's contributions also reached into philosophy and logic.

Hipparchus: Hipparchus was a renowned Greek astronomer, geographer, and mathematician. Regarded as the pioneer of trigonometry, he is primarily remembered for unexpectedly discovering the precession of the equinoxes. Born in Nicaea, Bithynia, he lived between 162 and 127 BC, and his work greatly contributed to the field of astronomy.

Hippocrates: Hippocrates of Kos, a Greek physician of great historical significance, is known as the "Father of Medicine." He made lasting contributions to the field, including the use of prognosis, clinical observation, and the categorization of diseases. Hippocrates revolutionized ancient Greek medicine, establishing it as a separate profession.

Hypatia: Hypatia, a Neoplatonist philosopher, astronomer, and mathematician, taught philosophy and astronomy in Alexandria, Egypt. She was the first well-recorded female mathematician and praised for her teaching and counsel. Hypatia wrote commentaries on Diophantus's Arithmetica and Apollonius of Perga's treatise on conic sections, and may have also edited Ptolemy's Almagest.

Pliny the Elder: Pliny the Elder was a Roman author and commander known for his encyclopedic work, Naturalis Historia. He was a friend of the emperor Vespasian and spent his spare time studying and investigating natural phenomena.

Ptolemy: Ptolemy was an Alexandrian mathematician, astronomer, astrologer, geographer, and music theorist. He authored important scientific treatises, including the Almagest, a significant astronomical text. He also wrote the Geography, which discussed maps and the knowledge of the Greco-Roman world. Ptolemy attempted to adapt horoscopic astrology to Aristotelian natural philosophy in his astrological treatise known as the Tetrábiblos or Quadripartite.

Pythagoras: Pythagoras, an ancient Greek philosopher, founded Pythagoreanism. His teachings influenced Plato, Aristotle, and the Western world. Little is known about his life due to legends, but it is agreed that he established a secretive school in southern Italy. A communal, ascetic lifestyle with dietary restrictions, potentially including vegetarianism, was practiced.

Zhang Heng: Zhang Heng, a remarkable polymathic scientist and statesman, thrived during China's Han dynasty. His extensive education in Luoyang and Chang'an empowered him to become a successful astronomer, mathematician, seismologist, hydraulic engineer, inventor, geographer, cartographer, ethnographer, artist, poet, philosopher, politician, and literary scholar.

Aryabhata: Aryabhata I was an important mathematician-astronomer from ancient India. He wrote the Āryabhaṭīya and Arya-siddhanta, significant works in Indian mathematics and astronomy.

Avicenna: Avicenna, also known as Ibn Sina, was a renowned Muslim philosopher and physician. He flourished during the Islamic Golden Age and served in the courts of Iranian rulers. Often called the father of early modern medicine, his philosophy was influenced by the Muslim Peripatetic school which drew from Aristotelian principles.

Al-Biruni: Al-Biruni, an Iranian scholar from the Khwarazmian Empire, was a prominent polymath during the Islamic Golden Age. His significant contributions include being considered the "founder of Indology," "Father of Comparative Religion," and "Father of modern geodesy." He is also recognized as the first anthropologist.

Brahmagupta: Brahmagupta, an Indian mathematician and astronomer, wrote two important works: the Brāhmasphuṭasiddhānta, a theoretical treatise, and the Khaṇḍakhādyaka, a practical text. His contributions to math and astronomy are notable.

Fibonacci: Fibonacci, or Leonardo Bonacci, was an accomplished Italian mathematician from the Middle Ages. He is revered as the most skilled Western mathematician of his time, hailing from the Republic of Pisa.

Ibn al-Haytham: Ibn al-Haytham was a medieval mathematician, astronomer, and physicist from Iraq. He is known as "the father of modern optics" for his contributions to optics and visual perception. His influential work, Kitāb al-Manāẓir, written from 1011 to 1021, had a Latin edition. Alhazen's works were cited by Newton, Kepler, Huygens, and Galileo during the scientific revolution.

Jabir ibn Hayyan: Jabir ibn Hayyan, also known as Abū Mūsā Jābir ibn Ḥayyān, was an influential figure in Arabic literature. He is attributed with an extensive collection of works known as the Jabirian corpus. His surviving works encompass alchemy, chemistry, magic, and Shi'ite religious philosophy. Originally, his writings covered a wide range of subjects including cosmology, astronomy, medicine, botany, metaphysics, logic, and grammar.

Al-Khwarizmi: Al-Khwarizmi, a Persian polymath, made significant contributions to mathematics, astronomy, and geography. He is known for his influential Arabic-language works. He served as the astronomer and head of the House of Wisdom in Baghdad in the 9th century.

Abu Bakr al-Razi: Abu Bakr al-Razi, also known as Rhazes, was a Persian physician, philosopher, and alchemist who lived during the Islamic Golden Age. He made significant contributions to medicine, logic, astronomy, and grammar. Al-Razi is recognized as one of the most important figures in the history of medicine. His critical stance on religion, particularly regarding concepts of prophethood and revelation, is notable. However, his religious and philosophical beliefs, including a belief in five "eternal principles," are only known through reports by hostile authors.

Shen Kuo: Shen Kuo, a Chinese polymath in the Song dynasty, excelled in mathematics, optics, and horology. He held various government positions, including finance minister and head official for the Bureau of Astronomy. Shen was aligned with the Reformist faction led by Chancellor Wang Anshi.

Nasir al-Din al-Tusi: Nasir al-Din al-Tusi, a Persian polymath, was a renowned author and scientist in various fields including mathematics, astronomy, logic, biology, and chemistry. He made significant contributions to astronomy with accurate planetary tables and an updated model, and is considered the creator of trigonometry. Tusi's work influenced later Persian scholars and possibly even heliocentrism. He also proposed the idea of varying levels of awareness among humans and animals.

Al-Zahrawi: Al-Zahrawi, also known as Albucasis or Abulcasis, was a renowned physician, surgeon, and chemist from al-Andalus. He is celebrated as one of the most significant surgeons of the Middle Ages.

William Gilbert (physicist): William Gilbert, an English physician, physicist, and natural philosopher, was a vocal opponent of Aristotle's philosophy and the Scholastic teaching method. His notable work, De Magnete (1600), remains his enduring legacy.

Robert Hooke: Robert Hooke was an acclaimed English polymath known for his work in science, architecture, and philosophy. He is recognized as one of the first scientists to discover microorganisms using a microscope he created. Hooke gained recognition through his architectural surveys after the Great Fire of London in 1666. He was a member of the Royal Society and served as its curator of experiments. Additionally, Hooke held the position of Professor of Geometry at Gresham College from 1665 to 1703.

Christiaan Huygens: Christiaan Huygens was a Dutch mathematician, physicist, engineer, astronomer, and inventor. He made significant contributions to optics and mechanics, discovered Titan (Saturn's largest moon), improved telescopes, and invented the pendulum clock. Huygens was a talented mathematician and physicist who introduced mathematical parameters to solve physical problems and explained unobservable phenomena.

Mikhail Lomonosov: Mikhail Lomonosov was a Russian polymath known for his contributions to literature, education, and science. He discovered the atmosphere of Venus and the law of conservation of mass in chemical reactions. He had a vast knowledge in various fields including natural science, chemistry, physics, mineralogy, history, art, philology, and optics. Lomonosov is considered as the founder of modern geology and played a significant role in shaping the modern Russian literary language.

Isaac Newton: Isaac Newton was an influential English mathematician, physicist, astronomer, alchemist, theologian, and author. He played a significant role in the Scientific Revolution and the Enlightenment. Newton's book, Philosophiæ Naturalis Principia Mathematica, published in 1687, revolutionized classical mechanics and consolidated previous scientific findings. He made groundbreaking contributions to optics and developed calculus independently, alongside Gottfried Wilhelm Leibniz. Regarded as one of history's greatest scientists, Newton's impact on science is immense.

André-Marie Ampère: André-Marie Ampère, a French physicist and mathematician, was a pioneer in classical electromagnetism, known as "electrodynamics." He invented important devices like the solenoid and the electrical telegraph. Despite being self-taught, Ampère was a member of the French Academy of Sciences and held professorships at the École polytechnique and the Collège de France.

Amedeo Avogadro: Amedeo Avogadro was an Italian scientist known for his contribution to molecular theory, specifically Avogadro's law. This law states that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. To honor him, the Avogadro constant (6.02214076×10^23 mol−1) represents the ratio of particles to substance and is one of the defining constants of the SI system.

Henri Becquerel: Henri Becquerel was a French physicist and engineer who discovered radioactivity. He received the Nobel Prize in Physics in 1903, along with Marie Skłodowska-Curie and Pierre Curie. The unit of radioactivity, the becquerel (Bq), is named after him.

Hans Bethe: Hans Bethe: German-American physicist known for significant contributions to nuclear physics, astrophysics, quantum electrodynamics, and solid-state physics. He received the 1967 Nobel Prize in Physics for his work on stellar nucleosynthesis theory. Bethe spent the majority of his career as a professor at Cornell University.

Niels Bohr: Niels Bohr, a Danish physicist and philosopher, made groundbreaking contributions to atomic structure and quantum theory. He received the Nobel Prize in Physics in 1922 and was actively engaged in promoting scientific research.

Ludwig Boltzmann: Ludwig Boltzmann, an Austrian physicist and philosopher, made significant contributions to statistical mechanics and explained the second law of thermodynamics. He defined entropy in 1877 as a measure of statistical disorder in a system. The Boltzmann constant, kB, was later named after him by Max Planck.

Max Born: Max Born, a German-British physicist and mathematician, played a crucial role in the advancement of quantum mechanics. His contributions extended to solid-state physics and optics as well. Born's supervision of notable physicists in the 1920s and 1930s was noteworthy. He received the 1954 Nobel Prize in Physics for his fundamental research in quantum mechanics, particularly the statistical interpretation of the wave function.

William Henry Bragg: William Henry Bragg was an accomplished English scientist and sportsman, known for his contributions to physics, chemistry, and mathematics. He made groundbreaking discoveries in crystal structure analysis using X-rays, for which he shared the 1915 Nobel Prize in Physics with his son Lawrence Bragg. Braggite, a mineral, was named in their honor. In recognition of his achievements, he was knighted in 1920.

Nicolas Léonard Sadi Carnot: Nicolas Léonard Sadi Carnot, a French mechanical engineer and physicist known as the "father of thermodynamics." His book, Reflections on the Motive Power of Fire, laid the groundwork for thermodynamics and the maximum efficiency of heat engines. Although initially overlooked, his work influenced the second law of thermodynamics and the concept of entropy, proving crucial for modern science and inventions like the automobile and jet engine.

Henry Cavendish: Henry Cavendish, an English natural philosopher and scientist, made significant contributions as an experimental chemist and physicist. He discovered hydrogen, calling it "inflammable air", and described its properties in a 1766 paper. Antoine Lavoisier later confirmed Cavendish's findings and named the element.

James Chadwick: James Chadwick was an English physicist who discovered the neutron and won the Nobel Prize in Physics in 1935. He wrote the MAUD Report in 1941, inspiring the US government's atom bomb research. He led the British team in the Manhattan Project during World War II and was knighted in 1945 for his contributions to physics.

Marie Curie: Marie Curie, a Polish-French physicist and chemist, conducted groundbreaking research on radioactivity. She was the first woman to win a Nobel Prize, winning it twice and in two scientific fields. Her husband Pierre Curie was her first co-winner, making them the first married couple to receive the Nobel Prize. Curie also became the first woman to be a professor at the University of Paris in 1906.

Pierre Curie: Pierre Curie was a French physicist known for his contributions to crystallography, magnetism, piezoelectricity, and radioactivity. He shared the 1903 Nobel Prize in Physics with his wife Marie Skłodowska–Curie and Henri Becquerel for their research on radiation. The Curies became the first married couple to win the Nobel Prize, starting a family legacy of five Nobel Prizes.

John Dalton: John Dalton, an English chemist and physicist, revolutionized chemistry with his atomic theory. He further investigated and suffered from color blindness, now widely referred to as Daltonism in multiple languages.

Paul Dirac: Paul Dirac was an influential English physicist known for his contributions to quantum mechanics and quantum electrodynamics. His work laid the groundwork for quantum field theory. He held prestigious positions at Cambridge and various American universities and was awarded the Nobel Prize in Physics in 1933.

Albert Einstein: Albert Einstein, a German-born theoretical physicist, is widely considered one of the most influential scientists of all time. He is best known for his development of the theory of relativity and his contributions to quantum mechanics. Einstein's famous equation, E=mc2, is a result of his work on relativity theory. He received the Nobel Prize in Physics in 1921 for his discovery of the photoelectric effect, which played a significant role in the development of quantum theory. Einstein's work has greatly impacted the philosophy of science, and his intellectual achievements have made him synonymous with genius.

Michael Faraday: Michael Faraday was an influential English scientist who made significant contributions to the study of electromagnetism and electrochemistry. Despite limited formal education, he discovered principles such as electromagnetic induction, diamagnetism, and electrolysis. Faraday established the concept of the electromagnetic field and its relationship with magnetism and light. His inventions in electric motor technology paved the way for practical use of electricity in technology.

Enrico Fermi: Enrico Fermi, an Italian-American physicist, is famous for creating the world's first nuclear reactor, the Chicago Pile-1, and for his involvement in the Manhattan Project. He is known as the "architect of the nuclear age" and the "architect of the atomic bomb". Fermi excelled in both theoretical and experimental physics, earning him the 1938 Nobel Prize in Physics for his work on induced radioactivity and the discovery of transuranium elements. He also contributed significantly to statistical mechanics, quantum theory, and nuclear and particle physics, filing patents that were later acquired by the US government.

Richard Feynman: Richard Feynman was an American theoretical physicist known for his work in quantum mechanics, quantum electrodynamics, and particle physics. His contributions to the development of quantum electrodynamics earned him a Nobel Prize in Physics in 1965.

Léon Foucault: Léon Foucault, a prominent French physicist, is renowned for his pivotal contributions in various areas. He cleverly showcased Earth's rotation with his Foucault pendulum invention. Additionally, Foucault played a significant role in measuring the speed of light, identifying eddy currents, and assigning the name "gyroscope" to this important apparatus.

Augustin-Jean Fresnel: Augustin-Jean Fresnel, a French engineer and physicist, established the wave theory of light in the 19th century, replacing Newton's corpuscular theory. He is renowned for inventing the catadioptric Fresnel lens, which enhanced the visibility of lighthouses, saving numerous lives at sea. Additionally, he reinvented the simpler dioptric stepped lens, widely used in screen magnifiers and condenser lenses for overhead projectors.

Murray Gell-Mann: Murray Gell-Mann was an American physicist known for his contributions to the theory of elementary particles. He introduced the concept of quarks as fundamental building blocks and played a key role in the development of quantum chromodynamics (QCD). Gell-Mann's work also involved chirality in weak interactions and spontaneous symmetry breaking in strong interactions, contributing to our understanding of mesons and baryons.

Stephen Hawking: Stephen Hawking was an influential English physicist, cosmologist, and author. He served as the director of research at the Centre for Theoretical Cosmology in Cambridge and held the esteemed position of Lucasian Professor of Mathematics at Cambridge from 1979 to 2009.

Werner Heisenberg: Werner Heisenberg was a German theoretical physicist and a pioneer of quantum mechanics. In 1925, he published a breakthrough paper and further developed the matrix formulation of quantum mechanics with Max Born and Pascual Jordan. He is best known for his uncertainty principle, published in 1927, and was awarded the Nobel Prize in Physics in 1932 for his significant contributions to the creation of quantum mechanics.

Hermann von Helmholtz: Hermann Ludwig Ferdinand von Helmholtz was a notable German physicist and physician. He made significant contributions in various scientific domains, most notably in hydrodynamic stability. The Helmholtz Association, the largest association of research institutions in Germany, is named after him.

Heinrich Hertz: Heinrich Hertz was a German physicist who confirmed the presence of electromagnetic waves, as predicted by James Clerk Maxwell's equations. The frequency unit "hertz" is named after him.

James Prescott Joule: James Prescott Joule, an English physicist, mathematician, and brewer, explored the relationship between heat and mechanical work, leading to the discovery of the law of conservation of energy. This in turn laid the foundation for the development of the first law of thermodynamics. As a tribute to his contributions, the SI unit of energy, the joule, was named after him.

Charles K. Kao: Charles K. Kao, a Chinese physicist and Nobel laureate, pioneered the use of fiber optics in telecommunications. During the 1960s, he developed methods to transmit digital data by combining glass fibers with lasers, thus paving the way for the Internet's evolution.

Gustav Kirchhoff: Gustav Kirchhoff, a German physicist, made significant contributions to understanding electrical circuits, spectroscopy, and black-body radiation.

Ernest Lawrence: Ernest Lawrence, an American nuclear physicist, won the 1939 Nobel Prize in Physics for inventing the cyclotron. He played a vital role in uranium-isotope separation during the Manhattan Project. Additionally, he founded the Lawrence Berkeley National Laboratory and the Lawrence Livermore National Laboratory.

Tsung-Dao Lee: Tsung-Dao Lee is a Chinese-American physicist, renowned for his contributions in various fields such as parity violation, the Lee-Yang theorem, particle physics, and relativistic heavy ion physics. He is also known for his research on nontopological solitons and soliton stars. Lee taught at Columbia University for almost six decades until his retirement in 2012.

Hendrik Lorentz: Hendrik Lorentz, a Dutch physicist, shared the 1902 Nobel Prize in Physics for discovering and explaining the Zeeman effect. He also derived the Lorentz transformation and force equations, fundamental to the special theory of relativity. Additionally, he developed the Lorentz oscillator model to explain abnormal refractive indices in dielectric materials.

Ernst Mach: Ernst Mach was an Austrian/Czech physicist and philosopher known for his contributions to the physics of shock waves. The ratio of speed to sound in a flow or object is named after him as the Mach number. He greatly influenced logical positivism and American pragmatism as a philosopher of science. His criticism of Newton's theories presaged Einstein's theory of relativity.

James Clerk Maxwell: James Clerk Maxwell was a Scottish physicist who formulated the classical theory of electromagnetic radiation. He recognized that electricity, magnetism, and light are different manifestations of the same phenomenon. His equations for electromagnetism are considered as a significant unification in physics, after Isaac Newton's achievements.

Lise Meitner: Lise Meitner was an Austrian-Swedish physicist known for discovering protactinium and nuclear fission. In 1917, she found the radioisotope protactinium-231 while researching radioactivity in Berlin. In 1938, Meitner and her nephew Otto Frisch discovered nuclear fission. Albert Einstein referred to her as the "German Marie Curie."

Albert A. Michelson: Albert A. Michelson, a Prussian-born American physicist, was known for his groundbreaking research on measuring the speed of light. He gained fame for conducting the Michelson-Morley experiment. In 1907, Michelson became the first American scientist to be awarded the Nobel Prize in Physics. Additionally, he founded and led the physics departments at the Case School of Applied Science and the University of Chicago.

Robert Andrews Millikan: Robert Andrews Millikan, an American experimental physicist, won the Nobel Prize for Physics in 1923. He is renowned for accurately measuring the elementary electric charge and his contributions to the photoelectric effect.

Georg Ohm: Georg Ohm was a German physicist and mathematician who discovered Ohm's law, which states that the potential difference across a conductor is directly proportional to the electric current flowing through it. This led to the creation of the unit of electrical resistance called the ohm, named after him.

J. Robert Oppenheimer: J. Robert Oppenheimer, an American physicist, led the Los Alamos Laboratory during World War II. He is renowned as the "father of the atomic bomb" due to his role in directing the Manhattan Project.

Hans Christian Ørsted: Hans Christian Ørsted, a Danish physicist and chemist, made a groundbreaking discovery that electric currents generate magnetic fields, establishing the initial link between electricity and magnetism. He is honored through Oersted's law and the oersted unit (Oe).

Wolfgang Pauli: Wolfgang Pauli, an Austrian theoretical physicist, made significant contributions to quantum physics. He was awarded the Nobel Prize in Physics in 1945 for his discovery of the exclusion principle or Pauli principle, which revealed a new law of Nature. This principle was based on his work in spin theory, which contributed to our understanding of the structure of matter.

Max Planck: Max Karl Ernst Ludwig Planck, a German theoretical physicist, earned the Nobel Prize in Physics in 1918 for his groundbreaking revelation of energy quanta.

C. V. Raman: C. V. Raman was an Indian physicist who discovered the change in wavelength and frequency of light when it passes through a transparent material, known as the Raman effect. He received the Nobel Prize in Physics in 1930 for this discovery, becoming the first Asian to receive a Nobel Prize in any branch of science.

Wilhelm Röntgen: Wilhelm Röntgen was a German engineer and physicist who discovered X-rays in 1895, earning him the first Nobel Prize in Physics. He was honored by having element 111 named roentgenium after him, and the unit of measurement roentgen was also named in his honor.

Ernest Rutherford: Ernest Rutherford, a New Zealand physicist, was a renowned researcher in atomic and nuclear physics. He is considered the "father of nuclear physics" and was highly regarded as an experimentalist. Rutherford was awarded the Nobel Prize in Chemistry in 1908 for his groundbreaking work on the disintegration of elements and radioactive substances. He was the first Oceanian Nobel laureate and conducted his awarded research in Canada.

Andrei Sakharov: Andrei Sakharov, a Soviet physicist and Nobel Peace Prize laureate, advocated for global human rights. He was awarded the prize in 1975.

Erwin Schrödinger: Erwin Schrödinger, an Austrian-Irish physicist, made significant contributions to quantum theory. He proposed the Schrödinger equation, which calculates the wave function of a system and its changes over time. He introduced the term "quantum entanglement" in 1932, being the earliest to discuss this phenomenon. Additionally, Schrödinger won the Nobel Prize for his groundbreaking work.

Edward Teller: Edward Teller, a Hungarian-American theoretical physicist, was dubbed "the father of the hydrogen bomb" and co-developed the Teller-Ulam design. Renowned for his scientific prowess, Teller also had a tumultuous personality and challenging relationships with others.

J. J. Thomson: J. J. Thomson, a British physicist and Nobel Laureate, discovered the electron, the first subatomic particle.

Lord Kelvin: Lord Kelvin, born William Thomson, was a prominent British mathematician, physicist, and engineer. He held the position of Professor of Natural Philosophy at the University of Glasgow for over five decades. Kelvin made significant contributions to the study of electricity, formulated the laws of thermodynamics, and played a crucial role in unifying physics. His achievements were recognized by the Royal Society, who awarded him the prestigious Copley Medal. In addition, Kelvin became the first British scientist to be elevated to the House of Lords in 1892.

Johannes Diderik van der Waals: Johannes Diderik van der Waals, a Dutch physicist and thermodynamicist, is known for his groundbreaking work on the equation of state for gases and liquids. He began as a schoolteacher and later became the first physics professor at the University of Amsterdam. He was awarded the 1910 Nobel Prize in physics for his contributions to the field.

Thomas Young (scientist): Thomas Young (scientist) was a British polymath and member of the Royal Society, known for his groundbreaking work in various fields such as vision, light, physiology, and Egyptology. He played a crucial role in deciphering Egyptian hieroglyphs, particularly through his study of the Rosetta Stone.

Tycho Brahe: Tycho Brahe, a renowned Danish astronomer, made precise astronomical observations and was recognized as an astronomer, astrologer, and alchemist. He is considered the last significant astronomer before the creation of the telescope.

Nicolaus Copernicus: Nicolaus Copernicus, a Renaissance polymath, was a mathematician, astronomer, and Catholic canon. He proposed a groundbreaking model of the universe, placing the Sun at its center instead of the Earth. He developed this model independently of Aristarchus of Samos, who had suggested a similar idea centuries before.

Galileo Galilei: Galileo Galilei, an Italian polymath, was a prominent astronomer, physicist, and engineer born in Pisa. Considered the father of modern science, he made groundbreaking contributions to observational astronomy, classical physics, the scientific method, and overall advancements in scientific thinking.

Edmond Halley: Edmond Halley: English astronomer, mathematician, and physicist. Succeeded John Flamsteed as the second Astronomer Royal in Britain in 1720.

Caroline Herschel: Caroline Herschel was a German-born British astronomer known for her discovery of comets, including one named after her. She collaborated closely with her brother, William Herschel, and made significant contributions to the field of astronomy.

William Herschel: William Herschel was a German-British astronomer and composer who collaborated with his sister Caroline. He moved to Britain at 19 after serving in the military band of Hanover.

Edwin Hubble: Edwin Hubble: American astronomer who pioneered extragalactic astronomy and observational cosmology.

Johannes Kepler: Johannes Kepler was a German astronomer, mathematician, and writer. He is known for his laws of planetary motion and influential books. Kepler's work laid the foundation for Isaac Newton's theory of universal gravitation and made him one of the founders of modern astronomy and the scientific method.

Georges Lemaître: Georges Lemaître, a Belgian Catholic priest, was a renowned physicist, mathematician, astronomer, and professor. He first proposed that the universe is expanding and suggested the concept of the "Big Bang theory" for the origin of the universe. Lemaître derived Hubble's law and published the first estimation of the Hubble constant prior to Edwin Hubble. His work was crucial in our understanding of the universe's evolution.

Carl Sagan: Carl Sagan was a prominent American astronomer and science communicator. His notable research centered around the possibility of extraterrestrial life and the production of amino acids from basic chemicals using light. He also created significant messages - the Pioneer plaque and the Voyager Golden Record - intended for potential understanding by extraterrestrial beings. Sagan advocated that the greenhouse effect causes the high temperatures on Venus, an idea now widely accepted.

Svante Arrhenius: Svante Arrhenius was a Swedish scientist known for his contributions to physical chemistry. He received the Nobel Prize for Chemistry in 1903 and was the first Swedish Nobel laureate. He played a significant role in establishing the field of physical chemistry and later became the director of the Nobel Institute.

Jöns Jacob Berzelius: Jöns Jacob Berzelius, a Swedish chemist, is considered one of the founders of modern chemistry. He became a member of the Royal Swedish Academy of Sciences and served as its principal functionary. Known as the "Father of Swedish Chemistry," he is universally recognized as Jacob Berzelius.

Robert Boyle: Robert Boyle was a prominent natural philosopher, chemist, physicist, alchemist, and inventor of the Anglo-Irish descent. Considered the first modern chemist, he played a crucial role in the development of modern chemistry and experimental scientific methods. Boyle's law, which explains the relationship between gas pressure and volume, is one of his notable contributions. His book, The Sceptical Chymist, is highly regarded in the field of chemistry. Additionally, he is recognized for his theological writings and his strong religious beliefs as an Anglican.

Humphry Davy: Humphry Davy was a British chemist and inventor known for inventing the Davy lamp and an early arc lamp. He also isolated elements such as potassium, sodium, calcium, strontium, barium, magnesium, and boron using electricity. Davy discovered the elemental nature of chlorine and iodine and pioneered the field of electrochemistry. He also made significant contributions to the study of clathrate hydrates.

Peter Debye: Peter Debye was a Dutch-American physics and physical chemistry Nobel laureate known for his significant contributions in these fields.

Joseph Louis Gay-Lussac: Joseph Louis Gay-Lussac, a renowned French chemist and physicist, is known for his groundbreaking discoveries including the composition of water as two parts hydrogen and one part oxygen by volume. His work on alcohol-water mixtures led to the development of the degrees Gay-Lussac, a widely used measurement system for alcoholic beverages. Additionally, Gay-Lussac formulated two important laws concerning gases, solidifying his legacy as a notable contributor to the field of chemistry and physics.

Josiah Willard Gibbs: Josiah Willard Gibbs, an American scientist, made significant contributions to physics, chemistry, and mathematics. His work in thermodynamics transformed physical chemistry into a rigorous science by applying statistical properties to explain the laws of thermodynamics. Gibbs also contributed to physical optics by applying Maxwell's equations and invented modern vector calculus as a mathematician.

Fritz Haber: Fritz Haber, a German chemist, invented the Haber-Bosch process, which synthesizes ammonia from nitrogen and hydrogen gases. This method is crucial for producing fertilizers and explosives at a large scale. Approximately one-third of global food production and half the world's population depend on ammonia produced through this process. Haber also proposed the Born-Haber cycle to evaluate the lattice energy of ionic solids. His contributions have established him as one of the most significant scientists and industrial chemists in history.

Otto Hahn: Otto Hahn was a German chemist known as the father of nuclear chemistry and nuclear fission. He discovered radioactive isotopes and phenomena like atomic recoil and nuclear isomerism. In 1938, Hahn, along with Lise Meitner and Fritz Strassmann, discovered nuclear fission, which led to the development of nuclear reactors and weapons. Hahn's contributions earned him the 1944 Nobel Prize in Chemistry.

Dorothy Hodgkin: Dorothy Hodgkin, an influential English chemist, revolutionized X-ray crystallography, a method used to analyze biomolecular structures. Her groundbreaking work in this field was pivotal to the advancement of structural biology and led to her Nobel Prize win.

Irving Langmuir: Irving Langmuir, an American scientist, won the 1932 Nobel Prize in Chemistry for his contributions to surface chemistry. He excelled in the fields of chemistry, physics, and engineering.

Antoine Lavoisier: Antoine Lavoisier was a French nobleman and chemist who played a crucial role in the chemical revolution of the 18th century. He greatly influenced the fields of chemistry and biology.

Gilbert N. Lewis: Gilbert N. Lewis, an American physical chemist, made significant contributions in various areas of chemistry. He discovered the covalent bond and developed the concept of electron pairs, revolutionizing our understanding of chemical bonding. His Lewis dot structures and valence bond theory remain influential in modern chemistry. Lewis also made important contributions to chemical thermodynamics, photochemistry, and isotope separation, and he formulated the concept of acids and bases. Additionally, he conducted research on relativity and quantum physics and famously coined the term "photon" to describe the smallest unit of radiant energy in 1926.

Justus von Liebig: Justus von Liebig, a German scientist and professor at the University of Giessen, is considered one of the founders of organic chemistry. He revolutionized agriculture by emphasizing the importance of nitrogen and trace minerals for plant growth. He also developed the law of the minimum, which explained how plant growth depended on the scarcest nutrient resource. Liebig's innovations extended to the manufacturing of beef extracts, and his concept led to the founding of the Liebig Extract of Meat Company, which later introduced the popular Oxo brand bouillon cube. He also popularized the Liebig condenser, an apparatus for condensing vapors.

Dmitri Mendeleev: Dmitri Mendeleev: Russian chemist known for formulating the Periodic Law and creating the periodic table. Corrected properties of known elements and predicted three undiscovered elements.

Linus Pauling: Linus Pauling was an influential American scientist, chemist, peace activist, and educator. He published a significant number of scientific papers and books, earning him the Nobel Prize in Chemistry in 1954. Additionally, he was awarded the Nobel Peace Prize in 1962 for his peace advocacy. Pauling stands as one of only five individuals to receive multiple Nobel Prizes, and the only one to have been awarded two unshared Prizes. He is also among the few individuals to have received Nobel Prizes in different fields.

Joseph Priestley: Joseph Priestley, the English chemist and philosopher, was renowned for his diverse contributions. He authored over 150 works, conducted experiments in various scientific fields, and excelled as a theologian, grammarian, and educator. Additionally, he held liberal political views.

Frederick Sanger: Summary: Frederick Sanger, a notable British biochemist, achieved the remarkable feat of winning the Nobel Prize in Chemistry not once, but twice.

Harold Urey: Harold Urey was an American physical chemist known for his groundbreaking research on isotopes, specifically the discovery of deuterium, which earned him the Nobel Prize in Chemistry in 1934. He made significant contributions to the development of the atom bomb and also played a role in theories regarding the emergence of organic life from inorganic matter.

Jacobus Henricus van 't Hoff: Jacobus Henricus "Henry" van 't Hoff Jr. was a Dutch physical chemist and the first winner of the Nobel Prize in Chemistry. He made significant contributions to the modern theories of chemical affinity, equilibrium, kinetics, and thermodynamics. Van 't Hoff also formulated the theory of the tetrahedral carbon atom, laid the foundation for stereochemistry, and correctly predicted the structures of allenes and cumulenes. He is recognized as one of the founders of physical chemistry.

Friedrich Wöhler: Friedrich Wöhler was a distinguished German chemist who made significant contributions to organic and inorganic chemistry. He successfully isolated beryllium and yttrium in pure metallic form for the first time. Moreover, Wöhler also achieved the first-ever preparation of important inorganic compounds, such as silane and silicon nitride.

Robert Burns Woodward: Robert Burns Woodward was a renowned American organic chemist who made significant contributions to the field. He is known for his expertise in synthesizing complex natural products and determining their molecular structure. Woodward collaborated with Roald Hoffmann to conduct theoretical studies on chemical reactions. In recognition of his achievements, he was awarded the Nobel Prize in Chemistry in 1965.

Louis Agassiz: Louis Agassiz was a Swiss-American biologist and geologist known for his expertise in Earth's natural history.

John James Audubon: John James Audubon, a French-American artist and naturalist, created a comprehensive visual record of North American bird species. His notable work, The Birds of America, is a renowned color-plate book filled with detailed illustrations. Audubon also identified 25 new bird species and has numerous locations named after him. His scientific contributions are still significant today.

Joseph Banks: Joseph Banks was an English naturalist, botanist, and supporter of the natural sciences. He held the title of 1st Baronet and made significant contributions in these fields.

Norman Borlaug: Norman Borlaug, an American agronomist, played a leading role in the Green Revolution by spearheading global agricultural initiatives. He received prestigious accolades such as the Nobel Peace Prize, the Presidential Medal of Freedom, and the Congressional Gold Medal, making him one of the few individuals to have received all three awards.

Rachel Carson: Rachel Carson was an influential American marine biologist, writer, and conservationist. Her book, Silent Spring (1962), and other writings greatly contributed to the global environmental movement.

George Washington Carver: George Washington Carver, a prominent black scientist, was an American agricultural scientist and inventor. He advocated for alternative crops to cotton and developed methods to prevent soil depletion. He made significant contributions in the early 20th century.

Edward Drinker Cope: Edward Drinker Cope was a renowned American scientist known for his contributions to various fields of study, including zoology, paleontology, anatomy, herpetology, and ichthyology. Despite coming from a wealthy Quaker family, he demonstrated exceptional scientific talent from an early age, publishing his first scientific paper at just 19 years old. While his father initially wanted him to pursue farming, Cope's passion for science eventually prevailed.

Francis Crick: Francis Crick was an English scientist who, along with James Watson, Rosalind Franklin, and Maurice Wilkins, played a crucial role in discovering the helical structure of DNA.

Georges Cuvier: Georges Cuvier, also known as Baron Cuvier, was a French naturalist and zoologist in the early 19th century. He is considered the "founding father of paleontology" and played a crucial role in establishing the fields of comparative anatomy and paleontology. Cuvier's work involved comparing living animals with fossils, shaping the way we understand the natural sciences today.

Charles Darwin: Charles Darwin, an English naturalist, geologist, and biologist, made significant contributions to evolutionary biology. He proposed that all life forms derive from a common ancestor, a concept now widely accepted in science. Together with Alfred Russel Wallace, he introduced the theory of natural selection, explaining how life evolves through a process similar to artificial selection. Darwin's impact on history is immense, and he was honored with burial in Westminster Abbey.

Rosalind Franklin: Rosalind Franklin, a British chemist and X-ray crystallographer, made significant contributions to understanding the structures of DNA, RNA, viruses, coal, and graphite. Her work on coal and viruses gained recognition during her lifetime, but her pivotal role in discovering the structure of DNA was largely overlooked. Franklin has been called the "wronged heroine," the "dark lady of DNA," the "forgotten heroine," a "feminist icon," and the "Sylvia Plath of molecular biology."

Jane Goodall: Dame Jane Goodall is a renowned English primatologist known as the foremost expert on chimpanzees. With over 60 years of study, Goodall's research delves into the social and family interactions of wild chimpanzees. Her observations started in 1960 at Gombe Stream National Park in Tanzania.

Stephen Jay Gould: Stephen Jay Gould was a prominent American paleontologist, evolutionary biologist, and science historian. He was highly influential in the field of popular science writing, teaching at Harvard University and working at the American Museum of Natural History. Later in his career, he split his time teaching between Harvard and New York University.

Ernst Haeckel: Ernst Haeckel was a German biologist, naturalist and artist, born in 1834. He is known for his contributions to evolutionary biology, the concept of recapitulation, and his stunning illustrations of the natural world. Haeckel coined the terms "ecology" and "stem cell" and advocated for the popularization of science through his widely-read books. Despite some controversy surrounding his theories, Haeckel made lasting contributions to our understanding of the natural world.

W. D. Hamilton: W. D. Hamilton was a British evolutionary biologist known for his significant contributions to evolutionary theory. He developed the gene-centered view of evolution, providing a genetic basis for altruism. Hamilton's work on sex ratios and the evolution of sex was influential. He is considered a forerunner of sociobiology and held the position of Royal Society Research Professor at Oxford University until his death in 2000.

Joseph Dalton Hooker: Joseph Dalton Hooker was a British botanist and explorer, known as the founder of geographical botany. He was Charles Darwin's closest friend and served as the director of the Royal Botanical Gardens, Kew for 20 years. He succeeded his father, William Jackson Hooker, and received prestigious honors in British science.

Thomas Henry Huxley: Thomas Henry Huxley, an eminent English biologist and anthropologist, was famously referred to as "Darwin's Bulldog" due to his fervent promotion of Charles Darwin's theory of evolution. His expertise lay in the field of comparative anatomy, making significant contributions in the field.

Hans Krebs (biochemist): Hans Krebs was a German-British biochemist known for studying cellular respiration. He discovered the citric acid cycle (Krebs cycle), which generates energy in oxygen-respiring organisms, earning him a Nobel Prize. He also found the urea cycle and the glyoxylate cycle, both important in various organisms.

Jean-Baptiste Lamarck: Jean-Baptiste Lamarck, a French naturalist and soldier, was one of the earliest supporters of biological evolution. He believed that evolution followed natural laws.

Antonie van Leeuwenhoek: Antonie van Leeuwenhoek, a self-taught Dutch scientist, was a pioneer in microscopy and microbiology during the Golden Age of Dutch science and technology. Often referred to as "the Father of Microbiology," he made significant contributions to the field and played a crucial role in the establishment of microbiology as a scientific discipline.

Carl Linnaeus: Carl Linnaeus, a Swedish biologist and physician, is known as the "father of modern taxonomy." He formalized binomial nomenclature, the modern system of naming organisms. Linnaeus' name is rendered in Latin as Carolus Linnæus and, after his ennoblement in 1761, as Carolus a Linné.

Konrad Lorenz: Konrad Lorenz, an Austrian zoologist and ornithologist, shared the Nobel Prize in Physiology or Medicine in 1973 for his contributions in the study of animal behavior. He is considered one of the founders of modern ethology and built upon the work of his teacher Oskar Heinroth.

Barbara McClintock: Barbara McClintock was an American scientist who won the 1983 Nobel Prize in Physiology or Medicine. She specialized in maize cytogenetics and made significant contributions to genetic research. McClintock developed techniques to study chromosomes and demonstrated genetic recombination during meiosis. She created the first genetic map for maize and discovered the importance of telomeres and centromeres in preserving genetic information. McClintock was highly respected in her field and received numerous accolades for her work.

Gregor Mendel: Gregor Mendel was a German-Czech biologist and Augustinian friar who became known as the founder of modern genetics. He conducted experiments with pea plants between 1856 and 1863, establishing the laws of heredity and discovering how certain traits are passed on through generations. Mendel was an abbot of St. Thomas' Abbey in Brno and gained posthumous recognition for his groundbreaking work.

Santiago Ramón y Cajal: Santiago Ramón y Cajal: Spanish neuroscientist and Nobel laureate specialized in neuroanatomy, histology, and the central nervous system. His groundbreaking research on the structure of the brain established him as a pioneer in modern neuroscience.

Alfred Russel Wallace: Alfred Russel Wallace, an English naturalist and explorer, independently developed the theory of evolution through natural selection. His paper on this topic, published in 1858, helped inspire Charles Darwin to publish "On the Origin of Species" in 1859. Wallace was also a geographer, anthropologist, biologist, and illustrator.

Eugenius Warming: Eugen Warming, a Danish botanist, is considered a pioneer in the field of ecology. He authored the first textbook on plant ecology, taught the first university course on the subject, and gave the discipline its definition and significance. Scholar R. J. Goodland accords him the title of the founder of ecology.

James Watson: James Watson is an American molecular biologist who, along with Francis Crick, proposed the double helix structure of DNA in 1953. He was awarded the Nobel Prize in Physiology or Medicine in 1962 for his contribution to understanding the molecular structure of nucleic acids and their role in transferring information in living organisms.

Claude Bernard: Claude Bernard was a renowned French physiologist known for his contributions to the concept of homeostasis. Referred to as "one of the greatest men of science," he coined the term milieu intérieur.

Alexander Fleming: Alexander Fleming was a Scottish physician and microbiologist who discovered penicillin, the world's first effective antibiotic, in 1928. His discovery of benzylpenicillin from the mold Penicillium rubens is considered the greatest victory over disease. He shared the 1945 Nobel Prize in Physiology or Medicine for this breakthrough with Howard Florey and Ernst Boris Chain.

Luigi Galvani: Luigi Galvani, an Italian physician, biologist, and philosopher, is known for his study of animal electricity. He made a significant discovery in 1780, observing that the muscles of deceased frogs' legs exhibited movement when exposed to an electrical spark. His work contributed to the early understanding of bioelectricity, building upon previous research by John Walsh and Hugh Williamson.

William Harvey: William Harvey, an important English physician, made significant contributions in the fields of anatomy and physiology. He was the first to fully describe the systemic circulation and the heart's role in pumping blood to the brain and body. Although others had hinted at this theory before, Harvey provided a comprehensive understanding of the topic.

Edward Jenner: Edward Jenner, an English physician and scientist, invented the smallpox vaccine, the world's first vaccine. He named it Variolae vaccinae after cowpox, which he discovered could protect against smallpox. Jenner's work in 1798, called Inquiry into the Variolae vaccinae, detailed this protective effect.

Robert Koch: Robert Koch was a German physician and microbiologist known for discovering the causes of deadly diseases like tuberculosis, cholera, and anthrax. He is considered a founder of modern bacteriology and is often called the father of microbiology and medical bacteriology. Koch's identification of the anthrax bacterium in 1876 marked the birth of modern bacteriology. His work proved that germs caused specific diseases, establishing the scientific basis of public health and saving countless lives. Koch is recognized as one of the founders of modern medicine.

Li Shizhen: Li Shizhen, a renowned Chinese physician during the Ming dynasty, was a multifaceted expert in acupuncture, herbal medicine, and pharmacology. His exceptional accomplishment, the Compendium of Materia Medica, is a vast and comprehensive 27-year work. Li Shizhen devised innovative techniques for categorizing herbal components and formulating remedies to effectively combat various ailments.

Joseph Lister: Joseph Lister, a British surgeon and medical scientist, pioneered antiseptic surgery and preventive healthcare. He revolutionized the craft of surgery, similar to how John Hunter revolutionized the science of surgery.

Florence Nightingale: Florence Nightingale was a pioneering English social reformer and statistician. She is known as the founder of modern nursing and rose to prominence during the Crimean War. Nightingale significantly reduced death rates by improving hygiene and living standards for wounded soldiers. She became an iconic figure in Victorian culture as "The Lady with the Lamp," who made nightly rounds to care for injured soldiers.

Paracelsus: Paracelsus, also known as Theophrastus von Hohenheim, was a Swiss physician, alchemist, theologian, and philosopher. He made significant contributions during the German Renaissance.

Louis Pasteur: Louis Pasteur was a French chemist and microbiologist known for his discoveries in vaccination, fermentation, and pasteurization. His breakthroughs in understanding diseases and hygiene laid the foundations for modern medicine. Pasteur's development of vaccines for diseases like rabies and anthrax saved millions of lives. He is considered a founder of modern bacteriology and microbiology and is honored as the "father of bacteriology" and the "father of microbiology."

Jonas Salk: Jonas Salk, an American virologist and medical researcher, developed one of the first successful polio vaccines. He attended City College of New York and New York University School of Medicine.

Ignaz Semmelweis: Ignaz Semmelweis, a Hungarian physician and scientist, pioneered antiseptic procedures to combat postpartum infections. He discovered that requiring healthcare workers to disinfect their hands drastically reduced infection rates. His work at Vienna General Hospital's First Obstetrical Clinic led to a significant drop in maternal mortality rates, from 18% to less than 2%. Semmelweis published his findings in 1861, emphasizing the importance of handwashing to prevent childbed fever.

Andreas Vesalius: Andreas Vesalius, a renowned anatomist and physician, revolutionized the study of human anatomy with his masterpiece, De Humani Corporis Fabrica Libri Septem. This groundbreaking book surpassed the previous work of Galen, making Vesalius the founder of modern human anatomy. Born in Brussels, he later became a professor at the University of Padua and served as the Imperial physician at the court of Emperor Charles V.

Jacques Cousteau: Jacques Cousteau was a French naval officer, oceanographer, filmmaker, and author. He co-invented the Aqua-Lung, the first successful SCUBA apparatus, which helped him produce groundbreaking underwater documentaries.

James Hutton: James Hutton was a Scottish scientist known as the "Father of Modern Geology." He was a geologist, agriculturalist, chemical manufacturer, naturalist, and physician. Hutton played a vital role in establishing geology as a modern science.

Charles Lyell: Charles Lyell was a Scottish geologist known for his work in explaining the Earth's history using natural causes. He is famous for his book Principles of Geology, which popularized the idea that the Earth's shape is determined by ongoing natural processes. Lyell's viewpoint, dubbed "uniformitarianism," contrasted with the prevailing theory of catastrophism. His book convinced many readers of the importance of "deep time" in understanding the Earth and its environment.

Marie Tharp: Marie Tharp: American geologist and oceanographic cartographer. Teamed up with Bruce Heezen to create the first scientific map of the Atlantic Ocean floor in the 1950s. Their collaboration unveiled a more intricate topography and multi-dimensional landscape of the sea's bottom.

Alfred Wegener: Alfred Wegener was a German scientist who specialized in various fields including climatology, geology, geophysics, meteorology, and polar research.

Leo Baekeland: Leo Baekeland, a Belgian chemist, is renowned for his inventions of Velox photographic paper in 1893 and Bakelite in 1907. He is hailed as "The Father of the Plastics Industry" due to Bakelite, an affordable, non-flammable, and adaptable plastic. This breakthrough marked the inception of the modern plastics industry.

John Logie Baird: John Logie Baird, a Scottish inventor and electrical engineer, showcased the world's first operational television system in 1926. He also invented the first publicly displayed color television system and the first practical electronic color television tube.

John Bardeen: John Bardeen was a renowned American physicist and electrical engineer. He holds the unique distinction of being the only person to receive the Nobel Prize in Physics twice. The first Nobel Prize was awarded in 1956 for his groundbreaking work on the invention of the transistor, along with William Shockley and Walter Brattain. Bardeen was awarded the second Nobel Prize in 1972 for his significant contributions to the BCS theory, a fundamental theory explaining conventional superconductivity, alongside Leon N. Cooper and John Robert Schrieffer.

Alexander Graham Bell: Alexander Graham Bell was a Scottish-Canadian-American inventor, scientist, and engineer who patented the first practical telephone. He co-founded AT&T in 1885.

Carl Benz: Carl Friedrich Benz, a German engine designer and automotive engineer, is renowned for creating the first practical modern automobile, known as the Benz Patent Motorcar. This groundbreaking vehicle was both the first car to be put into series production and the first to receive a patent in 1886. In that same year, Benz publicly test drove his invention, the Benz Patent-Motorwagen.

Emile Berliner: Emile Berliner (1851-1929) was a German-American inventor known for creating the flat disc record used in gramophones. He established several companies, including the United States Gramophone Company, The Gramophone Company in London, Deutsche Grammophon, and Berliner Gram-o-phone Company of Canada. Additionally, Berliner pioneered the first radial aircraft engine (1908), a helicopter (1919), and acoustical tiles (1920s).

Wernher von Braun: Wernher von Braun was a German-American aerospace engineer known for his role in developing rocket technology. He was a member of the Nazi Party and SS, and later became a pioneer of rocket and space technology in the United States.

Isambard Kingdom Brunel: Isambard Kingdom Brunel, a British civil and mechanical engineer, was a prominent figure in engineering history and the Industrial Revolution. He constructed dockyards, the Great Western Railway, steamships, bridges, and tunnels, all of which brought significant advancements to public transport and modern engineering. His designs transformed the English landscape and earned him the reputation as one of the greatest engineers of his time.

Cai Lun: Cai Lun, a Chinese eunuch court official of the Eastern Han dynasty, is credited with inventing paper and revolutionizing the papermaking process. By adding pulp from tree bark and hemp ends, he enabled large-scale paper production and its worldwide dissemination, despite earlier paper forms existing since the 3rd century BCE.

Wallace Carothers: Wallace Carothers, an American chemist, was a pioneering inventor and leader of organic chemistry at DuPont. He is best known for his significant contribution to the invention of nylon.

Louis Daguerre: Louis Daguerre was a renowned French artist and photographer who invented the daguerreotype process. He is considered one of the fathers of photography and also excelled in painting, scenic design, and the development of the diorama theatre.

Rudolf Diesel: Rudolf Diesel, a renowned German inventor and mechanical engineer, is credited with creating the Diesel engine, named after him. This engine is acclaimed for its ability to burn Diesel fuel efficiently, revolutionizing the automotive and industrial sectors.

George Eastman: George Eastman was an American entrepreneur who founded the Eastman Kodak Company. He pioneered the use of roll film in photography, making it accessible to the public. He also played a key role in expanding the company and the film industry as its president.

Thomas Edison: Thomas Edison was a prominent American inventor and businessman. His inventions, including the phonograph, motion picture camera, and early versions of the electric light bulb, greatly influenced the modern world. Edison was known for his application of organized science and teamwork in the invention process, and he established the first industrial research laboratory.

Gustave Eiffel: Gustave Eiffel, a French civil engineer, gained notoriety for constructing bridges for the French railway. He is most recognized for the iconic Eiffel Tower and his involvement in building the Statue of Liberty. After retiring from engineering, Eiffel dedicated himself to researching meteorology and aerodynamics, making noteworthy advancements in both fields.

Philo Farnsworth: Philo Taylor Farnsworth, an American inventor and TV pioneer, made significant contributions to the early development of all-electronic television. He is renowned for inventing the first fully functional all-electronic image pickup device, known as the image dissector, in 1927. Farnsworth also created the first complete all-electronic television system, including a receiver and camera, which he commercially produced from 1938 to 1951 through the Farnsworth Television and Radio Corporation in Fort Wayne, Indiana.

Lee de Forest: Lee de Forest was an American inventor who played a crucial role in the early development of electronics. He is best known for inventing the first practical electronic amplifier called the "Audion" triode vacuum tube in 1906. This breakthrough initiated the Electronic Age and paved the way for the invention of the electronic oscillator. De Forest's inventions revolutionized various fields, including radio broadcasting, long distance telephone lines, and even led to the creation of talking motion pictures.

Robert Fulton: Robert Fulton, an American engineer and inventor, is known for creating the first successful steamboat, the North River Steamboat. This steamboat made a groundbreaking round trip of 300 nautical miles on the Hudson River in 1807, taking 62 hours. It revolutionized river traffic and trade in the United States.

Robert H. Goddard: Robert H. Goddard was an American inventor and engineer who built the world's first liquid-fueled rocket in 1926. He also improved the solid-fueled rocket, marking the beginning of modern rocketry. His team successfully launched 34 rockets, reaching altitudes of 2.6 km and speeds of 885 km/h.

Johannes Gutenberg: Johannes Gutenberg, a German inventor, revolutionized Europe with his movable-type printing press. His invention led to an information revolution, widespread literature, and influenced the Renaissance, Reformation, and humanist movements. Gutenberg’s printing press is considered an essential catalyst for these significant changes in history.

Jack Kilby: Jack Kilby, an American electrical engineer, co-developed the first integrated circuit in 1958 at Texas Instruments. He was also awarded the Nobel Prize in Physics in 2000.

Sergei Korolev: Sergei Korolev was a prominent Soviet rocket engineer and spacecraft designer during the Space Race. He played a crucial role in inventing the R-7 Rocket, Sputnik 1, and launching various historic missions. These missions included sending Laika, the first living being, into space, and Yuri Gagarin, the first human, as well as Alexei Leonov, the first person to conduct a spacewalk. Korolev's contributions significantly advanced the Soviet Union's space exploration efforts.

Guglielmo Marconi: Guglielmo Marconi was an Italian inventor known for creating a practical wireless telegraph system using radio waves. He is credited as the inventor of radio and shared the Nobel Prize in Physics in 1909 for his contributions to the development of wireless telegraphy.

Cyrus McCormick: Cyrus McCormick was an American inventor and businessman known for founding the McCormick Harvesting Machine Company. He played a key role in the development of the mechanical reaper, building on the work of his father and a slave named Jo Anderson. His company became successful due to his efforts in manufacturing, marketing, and sales. McCormick and his family were prominent residents of Chicago.

Montgolfier brothers: The Montgolfier brothers were French pioneers in aviation and paper manufacturing. They invented the Montgolfière-style hot air balloon and conducted the first human piloted ascent in 1783. Jacques-Étienne Montgolfier was the first person to be carried in their invention.

Samuel Morse: Samuel Morse, an American inventor and painter, achieved fame as a portrait painter before inventing the single-wire telegraph system. He co-developed Morse code in 1837 and played a key role in advancing the use of telegraphy commercially.

Nicéphore Niépce: Joseph Nicéphore Niépce, a French inventor, was one of the earliest pioneers of photography. He developed heliography, the first photographic process, and created the oldest surviving photographic print in 1825. Using a primitive camera, Niépce also captured the oldest surviving photograph of a real-world scene in 1826 or 1827. He additionally invented the Pyréolophore, one of the world's first internal combustion engines, in collaboration with his brother Claude Niépce.

Alfred Nobel: Alfred Nobel, a Swedish chemist, inventor, engineer, and businessman, is renowned for his invention of dynamite. He held 355 patents in his lifetime and made significant contributions to science. Nobel dedicated his fortune to establish the prestigious Nobel Prize. His most famous invention, patented in 1867, was dynamite, which utilized nitroglycerin as an explosive.

Charles Algernon Parsons: Charles Algernon Parsons was an Anglo-Irish engineer who invented the compound steam turbine, revolutionizing power generation. He had a significant impact on naval and electrical engineering with his work on dynamo and turbine design. Parsons also developed optical equipment for searchlights and telescopes.

William Shockley: William Shockley was an American inventor and physicist, known for his work at Bell Labs. He led a research group that included John Bardeen and Walter Brattain, and together they discovered the transistor effect. This groundbreaking research earned them the 1956 Nobel Prize in Physics. Additionally, Shockley had controversial beliefs as a eugenicist.

George Stephenson: George Stephenson, a renowned English civil and mechanical engineer during the Industrial Revolution, earned the title "Father of Railways". His dedication and desire for progress made him an exemplary figure admired by the Victorians. Additionally, Stephenson's adoption of the 4-foot-8+1⁄2-inch (1.435 m) standard gauge, known as the "Stephenson gauge", became widely employed by railways worldwide.

Nikola Tesla: Nikola Tesla, a Serbian-American inventor and engineer, greatly impacted the modern electrical system, particularly in the development of alternating current (AC) electricity supply.

Alessandro Volta: Alessandro Volta was an Italian physicist and chemist known for inventing the electric battery and discovering methane. His voltaic pile invention in 1799 proved that electricity could be generated chemically, debunking the theory that it solely came from living beings. This sparked scientific excitement and paved the way for the development of electrochemistry.

James Watt: James Watt was a Scottish inventor and engineer who developed and improved upon the steam engine, revolutionizing industrialization in Great Britain and the world.

Eli Whitney: Eli Whitney Jr. was a prominent American inventor who created the cotton gin in 1793. His invention greatly influenced the Antebellum South's economy, becoming a crucial invention of the Industrial Revolution.

Steve Wozniak: Steve Wozniak, also known as "Woz," is an American technology entrepreneur, engineer, scientist, programmer, philanthropist, and inventor. He co-founded Apple Computer with Steve Jobs in 1976 and played a significant role in the personal computer revolution of the 1970s and 1980s.

Wright brothers: The Wright brothers, Orville and Wilbur Wright, invented, built, and flew the first successful airplane in 1903. Their historic flight took place in Kitty Hawk, North Carolina. They went on to develop more advanced aircraft, including the first practical fixed-wing plane in 1905.

Jean le Rond d'Alembert: Jean le Rond d'Alembert was a French mathematician, physicist, philosopher, music theorist, and co-editor of the Encyclopédie. He is known for his formula for solving the wave equation and his contributions to the fundamental theorem of algebra in French.

Daniel Bernoulli: Daniel Bernoulli, a Swiss mathematician and physicist, applied mathematics to mechanics, particularly fluid mechanics. He was a pioneer in probability and statistics and is best known for the Bernoulli's principle. This principle explains the mechanics behind the carburetor and airplane wings.

Jacob Bernoulli: Jacob Bernoulli was a prominent mathematician from the Swiss Bernoulli family. He supported Leibniz during the calculus controversy and made significant contributions to Leibnizian calculus and the calculus of variations. Bernoulli discovered the constant e and his major contribution lies in the field of probability, where he derived the first version of the law of large numbers in his work Ars Conjectandi.

Johann Bernoulli: Johann Bernoulli, a Swiss mathematician from the renowned Bernoulli family, made significant contributions to infinitesimal calculus. He played a crucial role in educating the famous mathematician Leonhard Euler during his early years.

Gerolamo Cardano: Gerolamo Cardano was an influential Italian polymath known for his expertise in various fields including mathematics, medicine, biology, physics, chemistry, astrology, astronomy, philosophy, writing, and gambling. He made significant contributions to the development of probability, introducing the binomial coefficients and the binomial theorem in the Western world. He authored over 200 scientific works.

Leonhard Euler: Leonhard Euler, a Swiss mathematician and physicist, was a pioneer in graph theory, topology, and analytic number theory. He made influential contributions in diverse mathematical branches such as complex analysis, infinitesimal calculus, and introduced modern mathematical terminology and notation. Euler's work also extended to mechanics, fluid dynamics, optics, astronomy, and music theory.

Pierre de Fermat: Pierre de Fermat, a French mathematician, played a crucial role in the early development of infinitesimal calculus and made significant contributions to analytic geometry, probability, and optics. He is renowned for his technique of adequality and his original method of finding the greatest and smallest ordinates of curved lines, resembling differential calculus. Fermat is famously known for his Fermat's principle and his groundbreaking Fermat's Last Theorem in number theory. Additionally, he pursued a career as a lawyer at the Parlement of Toulouse, France.

Gottfried Wilhelm Leibniz: Gottfried Wilhelm Leibniz, a German polymath, was a mathematician, philosopher, scientist, and diplomat. He is known for inventing calculus and making significant contributions to various disciplines, including mathematics, physics, technology, and library science. Leibniz's extensive knowledge and skills in different fields earned him the title of the "last universal genius." His works spanned philosophy, theology, ethics, politics, law, history, games, music, and more. He also anticipated concepts later developed in probability theory, biology, medicine, psychology, linguistics, and computer science. Leibniz's contributions were documented in numerous writings, letters, and manuscripts in Latin, French, and German.

Blaise Pascal: Blaise Pascal, a notable French figure, excelled in various fields including mathematics, physics, invention, philosophy, and Catholic writing.

Niels Henrik Abel: Niels Henrik Abel was a Norwegian mathematician known for his groundbreaking contributions in various fields. His most notable achievement was proving the impossibility of solving the general quintic equation in radicals, resolving a longstanding mathematical problem. Despite living in poverty, Abel also made significant advancements in the study of elliptic functions and discovered Abelian functions. Unfortunately, he died at the age of 26 from tuberculosis.

Stefan Banach: Stefan Banach, a prominent Polish mathematician, is regarded as a highly influential figure in 20th-century mathematics. He played a crucial role in establishing modern functional analysis and was a founding member of the Lwów School of Mathematics. His notable accomplishment includes authoring the groundbreaking 1932 book, Théorie des opérations linéaires, which served as the pioneering monograph on the general theory of functional analysis.

George Boole: George Boole was an English mathematician, philosopher, and logician who pioneered the field of Boolean algebra. He served as the first mathematics professor at Queen's College, Cork in Ireland, and made significant contributions to differential equations and algebraic logic. His book, The Laws of Thought (1854), introduced Boolean logic, which is considered the foundation of the Information Age. Boole's work, along with Claude Shannon, established the groundwork for modern information and computer science.

Georg Cantor: Georg Cantor was a mathematician known for his creation of set theory, which is a fundamental theory in mathematics. He established the significance of one-to-one correspondence between sets, defined infinite and well-ordered sets, and showed that the real numbers are more numerous than the natural numbers. Cantor's work also included the development of cardinal and ordinal numbers. His contributions have profound mathematical and philosophical implications.

Augustin-Louis Cauchy: Augustin-Louis Cauchy, a French mathematician, engineer, and physicist, made significant contributions to various branches of mathematics. He played a crucial role in the development of mathematical analysis, continuum mechanics, complex analysis, and abstract algebra by rigorously proving theorems and rejecting previous algebraic approaches.

Arthur Cayley: Arthur Cayley, a prominent British mathematician, made significant contributions to the field of algebra. He was instrumental in establishing the contemporary British pure mathematics discipline.

Peter Gustav Lejeune Dirichlet: Peter Gustav Lejeune Dirichlet, a German mathematician, made significant contributions to number theory, Fourier series, and mathematical analysis. He is known as one of the pioneers who established the modern definition of a function.

Ronald Fisher: Ronald Fisher was a British polymath and key figure in statistics and genetics. He is credited with creating the foundations for modern statistical science and played a significant role in combining Mendelian genetics and natural selection. Fisher's work contributed to the revival of Darwinism and he is regarded as one of the founding fathers of Neo-Darwinism.

Joseph Fourier: Joseph Fourier was a French mathematician and physicist known for his work on Fourier series, Fourier analysis, and harmonic analysis. He made significant contributions to understanding heat transfer, vibrations, and the greenhouse effect. His name is associated with the Fourier transform and Fourier's law of conduction.

Gottlob Frege: Gottlob Frege was a German philosopher, logician, and mathematician known as the father of analytic philosophy. He focused on the philosophy of language, logic, and mathematics while working as a math professor at the University of Jena. Although overlooked during his lifetime, his work was introduced by prominent philosophers such as Peano, Russell, and Wittgenstein. Frege is widely regarded as one of the most influential logicians in history and a profound philosopher of mathematics.

Évariste Galois: Évariste Galois, a French mathematician and political activist, revolutionized algebra by solving a long-standing problem on polynomial solvability. His achievement paved the way for the development of Galois theory and group theory, key branches in abstract algebra.

Francis Galton: Sir Francis Galton, a versatile British scholar, played an instrumental role in pioneering the eugenics movement in the Victorian era.

Carl Friedrich Gauss: Carl Friedrich Gauss was a renowned German mathematician, geodesist, and physicist. His remarkable contributions to various fields in mathematics and science make him one of history's most influential and celebrated mathematicians, often referred to as the "Prince of Mathematicians."

Kurt Gödel: Kurt Gödel, a prominent logician, mathematician, and philosopher, exerted a significant influence on scientific and philosophical thought in the 20th century. Often mentioned alongside Aristotle and Gottlob Frege, he played a crucial role in the investigation of the foundations of mathematics, following the footsteps of mathematicians such as Richard Dedekind, Georg Cantor, and Gottlob Frege. His work impacted renowned thinkers like Bertrand Russell, Alfred North Whitehead, and David Hilbert who were exploring logic and set theory during that period.

Alexander Grothendieck: Alexander Grothendieck, a renowned French mathematician, greatly contributed to modern algebraic geometry. His groundbreaking research expanded the field and incorporated commutative algebra, homological algebra, sheaf theory, and category theory. Grothendieck's "relative" perspective led to transformative advancements in various areas of pure mathematics. Widely regarded as the greatest mathematician of the 20th century.

William Rowan Hamilton: William Rowan Hamilton was an Irish mathematician, astronomer, and physicist. He held prestigious positions as the Andrews Professor of Astronomy at Trinity College Dublin and Royal Astronomer of Ireland at Dunsink Observatory.

Charles Hermite: Charles Hermite was a renowned French mathematician known for his extensive research in number theory, quadratic forms, invariant theory, orthogonal polynomials, elliptic functions, and algebra.

David Hilbert: David Hilbert, a highly influential German mathematician, made significant contributions in various fields such as geometry, algebra, number theory, calculus of variations, and mathematical physics. His discoveries and developments span from invariant theory and commutative algebra to the foundations of mathematics and integral equations.

Carl Gustav Jacob Jacobi: Carl Gustav Jacob Jacobi was a prominent German mathematician who made significant contributions to various fields including elliptic functions, dynamics, differential equations, determinants, and number theory. He was also known as Carolus Gustavus Iacobus Iacobi in his Latin books, and sometimes referred to as Karl.

Andrey Kolmogorov: Andrey Kolmogorov was a Soviet mathematician known for his contributions to probability theory, topology, logic, turbulence, classical mechanics, information theory, and computational complexity.

Joseph-Louis Lagrange: Joseph-Louis Lagrange, also known as Giuseppe Luigi Lagrange or Lagrangia, was a renowned mathematician, physicist, and astronomer. He made notable contributions to analysis, number theory, classical mechanics, and celestial mechanics. Lagrange was Italian by birth but later became a French citizen.

Pierre-Simon Laplace: Pierre-Simon Laplace, a French scholar and polymath, made significant contributions to multiple fields including engineering, mathematics, statistics, physics, astronomy, and philosophy. His five-volume Mécanique céleste extended and summarized the work of his predecessors, transforming classical mechanics with calculus and expanding problem-solving possibilities. Laplace also played a pivotal role in developing the Bayesian interpretation of probability in statistics.

Nikolai Lobachevsky: Nikolai Lobachevsky was a Russian mathematician known for his groundbreaking work on hyperbolic geometry, also called Lobachevskian geometry. He further contributed to the field with his influential study on Dirichlet integrals, known as the Lobachevsky integral formula.

Benoit Mandelbrot: Benoit Mandelbrot was a mathematician who had a strong interest in the practical sciences and the study of roughness in physical phenomena. He coined the term "fractal" and contributed to the field of fractal geometry. Mandelbrot's theories explored the concept of self-similarity in nature and the unpredictable aspects of life.

Gaspard Monge: Gaspard Monge, a French mathematician and Minister of the Marine during the French Revolution, is known for inventing descriptive and technical drawing. He is considered the father of differential geometry and played a part in reforming the French educational system, co-founding the École Polytechnique.

John von Neumann: John von Neumann, a Hungarian-American mathematician and scientist, made significant contributions to various fields such as mathematics, physics, economics, computing, and statistics. He played a key role in quantum physics, functional analysis, and game theory. Von Neumann introduced important concepts like cellular automata, universal constructor, and the digital computer. His work on self-replication preceded the discovery of DNA's structure.

Emmy Noether: Emmy Noether, a German mathematician, made significant contributions to abstract algebra. She discovered fundamental theorems in mathematical physics, earning her recognition as the most important woman in math history by renowned mathematicians. Her work in rings, fields, and algebras further established her as a leading mathematician of her time. In physics, Noether's theorem explains the link between symmetry and conservation laws.

Karl Pearson: Karl Pearson was a notable English mathematician and biostatistician known for establishing mathematical statistics. He founded the first university statistics department at University College London and made significant contributions in biometrics and meteorology. Pearson's work demonstrates scientific racism, as he advocated for Social Darwinism and eugenics. He was a protégé of Francis Galton and also completed important works by Clifford and Todhunter after their deaths.

Henri Poincaré: Henri Poincaré was a French polymath who excelled in mathematics, physics, engineering, and philosophy of science. He was known as "The Last Universalist" for his expertise in all aspects of mathematics. Poincaré's scientific contributions and groundbreaking discoveries have earned him the title of "the philosopher par excellence of modern science."

Siméon Denis Poisson: Siméon Denis Poisson was a French mathematician and physicist who made significant contributions in various fields including statistics, complex analysis, and partial differential equations. He also worked on topics such as calculus, mechanics, electricity, magnetism, thermodynamics, elasticity, and fluid mechanics. Notably, he predicted the Poisson spot while attempting to refute Augustin-Jean Fresnel's wave theory, which was later validated.

Srinivasa Ramanujan: Srinivasa Ramanujan was an Indian mathematician who made significant contributions to various fields including mathematical analysis, number theory, infinite series, and continued fractions. Despite having minimal formal training, he solved mathematical problems that were previously believed to be unsolvable.

Bernhard Riemann: Bernhard Riemann, a German mathematician, made profound contributions to analysis, number theory, and differential geometry. He formulated the Riemann integral and advanced Fourier series in real analysis. In complex analysis, he introduced Riemann surfaces, revolutionizing the geometric treatment. His 1859 paper presented the Riemann hypothesis, foundational to analytic number theory. Riemann also laid the groundwork for general relativity through his work in differential geometry. He is widely regarded as one of the greatest mathematicians in history.

Claude Shannon: Claude Shannon, the "father of information theory," was an American mathematician, engineer, computer scientist, and cryptographer. He, along with George Boole, established the groundwork of the Information Age.

Alfred Tarski: Alfred Tarski, a Polish-American logician and mathematician, was a prominent figure in various fields such as model theory, metamathematics, and algebraic logic. He made significant contributions to abstract algebra, topology, geometry, measure theory, mathematical logic, set theory, and analytic philosophy.

Karl Weierstrass: Karl Weierstrass, the "father of modern analysis," was a German mathematician. Although he didn't graduate college, he studied math and trained as a school teacher. He taught various subjects, including math, physics, botany, and gymnastics. Weierstrass later received an honorary doctorate and became a mathematics professor in Berlin.

Hermann Weyl: Hermann Weyl was a German mathematician, physicist, logician, and philosopher associated with the University of Göttingen tradition of mathematics. He spent his working life in Zürich and Princeton.

Charles Babbage: Charles Babbage, an English polymath, was a mathematician, philosopher, inventor, and mechanical engineer. He conceptualized the idea of a digital programmable computer, establishing the foundation for modern computing.

Tim Berners-Lee: Tim Berners-Lee, or TimBL, is an English computer scientist renowned for creating the World Wide Web, HTML, URLs, and HTTP. He holds research positions at the University of Oxford and MIT.

Edsger W. Dijkstra: Edsger W. Dijkstra, a prominent Dutch computer scientist, was an accomplished programmer, software engineer, and science essayist.

Douglas Engelbart: Douglas Engelbart was an American engineer and inventor who pioneered the field of human-computer interaction. He is famous for creating the computer mouse and developing hypertext, networked computers, and graphical user interfaces. His accomplishments were showcased in The Mother of All Demos in 1968. Engelbart's law, which states that human performance rate is exponential, is named after him.

Grace Hopper: Grace Hopper was a computer scientist, mathematician, and U.S. Navy rear admiral. She pioneered computer programming as one of the first programmers of the Harvard Mark I computer. Hopper devised the theory of machine-independent programming languages and created the FLOW-MATIC language. Her work led to the development of COBOL, an early high-level programming language still used today.

Donald Knuth: Donald Knuth is an esteemed American computer scientist and mathematician, known as the "father of the analysis of algorithms." He is a professor emeritus at Stanford University and earned the prestigious ACM Turing Award in 1974, recognized as the highest honor in computer science.

Ada Lovelace: Ada Lovelace was an English mathematician and writer who worked on Charles Babbage's Analytical Engine, a proposed mechanical computer. She was the first to realize that the machine could have uses beyond just calculations.

Dennis Ritchie: Dennis Ritchie was a renowned American computer scientist famous for creating the C programming language and co-developing Unix OS. He received distinguished awards, including the Turing Award, Hamming Medal, and the National Medal of Technology. Ritchie was the head of Lucent Technologies System Software Research Department before retiring in 2007. He was commonly referred to as "dmr" and is known for his contributions to K&R C.

Linus Torvalds: Linus Torvalds, a prominent Finnish-American software engineer, is best known as the creator and lead developer of the Linux kernel. This kernel is widely used in various operating systems, including Chrome OS, Android, Debian, and Arch. Torvalds also contributed significantly to the development of Git, a popular distributed version control system.

Alan Turing: Alan Turing was an influential English mathematician, computer scientist, and logician. He formalized the idea of algorithm and computation with the Turing machine, seen as a model of a general-purpose computer. Known as the father of theoretical computer science and artificial intelligence, Turing made significant contributions to these fields and played a crucial role in World War II as a cryptanalyst.

Konrad Zuse: Konrad Zuse, a pioneering computer scientist and engineer, was a German inventor and businessman. He is celebrated for creating the world's first programmable computer called the Z3, which became operational in May 1941. Due to his groundbreaking machines, Zuse is considered by some as the inventor and father of the modern computer.

Johan Cruyff: Johan Cruyff, the legendary Dutch football player and manager, is widely considered one of the greatest players in history. He won the Ballon d'Or three times and popularized the football philosophy known as Total Football. Cruyff's playing style and coaching ideas have had a significant impact on modern football, making him one of the most influential figures in the sport. He is also recognized as one of the greatest managers of all time.

Cristiano Ronaldo: Cristiano Ronaldo is a Portuguese footballer, known as one of the greatest players in history. He has won several prestigious awards, including five Ballon d'Ors and three UEFA Men's Player of the Year titles. Ronaldo has achieved remarkable success in his career, winning 33 trophies, including seven league titles and five UEFA Champions Leagues. He holds numerous records, such as most appearances, goals, and assists in the Champions League, as well as the highest goal scorer in the European Championship and internationally. Ronaldo's longevity and prolific goal-scoring have made him the top scorer of all time, with over 850 official goals for club and country.

Alfredo Di Stéfano: Alfredo Di Stéfano was a highly respected footballer and coach known for his incredible skills and contribution to Real Madrid's success in the 1950s and 1960s. He was a forward and regarded as one of the greatest footballers of all time. Nicknamed "Saeta Rubia," he played a crucial role in the club's dominance in the European Cup and La Liga. Di Stéfano played an important part in all of Real Madrid's five European Cup victories, scoring goals in each final. Although he played internationally for Spain, he also represented Argentina and Colombia during his career.

Mia Hamm: Mia Hamm, a former American soccer player, achieved great success in her career. She won two Olympic gold medals and two FIFA Women's World Cup titles. Known as a soccer icon, Hamm played as a forward for the US national team from 1987 to 2004. She was also the face of the Women's United Soccer Association (WUSA) and played for the Washington Freedom from 2001 to 2003. Additionally, Hamm had a successful college soccer career at the University of North Carolina, helping the team win four NCAA Division I Women's Soccer Championship titles.

Lionel Messi: Lionel Messi, or Leo Messi, is an Argentine professional footballer known for his outstanding career. He plays as a forward, captaining both Major League Soccer club Inter Miami and the Argentina national team. Messi has an impressive record, winning numerous prestigious awards including eight Ballon d'Or and six European Golden Shoes. He spent most of his career with Barcelona, where he won 34 trophies and achieved great success in both domestic and international competitions. Messi is a prolific scorer and skilled playmaker, holding multiple records for goals and assists in La Liga and the UEFA Champions League. He is also the highest-scoring South American male in international matches. With over 800 career goals, Messi is considered one of the greatest players of all time.

Pelé: Pelé, the Brazilian professional footballer, is widely regarded as one of the greatest players of all time. He achieved immense success and popularity in the 20th century and was named Athlete of the Century by the International Olympic Committee. Pelé's impressive career included scoring 1,279 goals in 1,363 games, a record recognized by Guinness World Records. He was also honored as World Player of the Century by the International Federation of Football History & Statistics and was one of the joint winners of the FIFA Player of the Century award.

Ronaldo (Brazilian footballer): Ronaldo Luís Nazário de Lima, also known as Ronaldo or Ronaldo Nazário, is a legendary Brazilian footballer who played as a striker and is now involved in club ownership. Often called O Fenômeno and R9, he is celebrated as one of the greatest players in history. Ronaldo revolutionized the striker position with his versatility, inspiring future generations of players. His remarkable career saw him win the FIFA World Player of the Year title three times and claim two Ballon d'Or awards.

Zinedine Zidane: Zinedine Zidane, also known as Zizou, is a renowned French football manager and former player. He excelled as an attacking midfielder and is considered one of the greatest players of all time. Zidane's skills and style were characterized by elegance, vision, passing, ball control, and technique. Throughout his career, he received numerous accolades, including the FIFA World Player of the Year award in 1998, 2000, and 2003, as well as the prestigious Ballon d'Or in 1998. Recently, Zidane achieved considerable success as the coach of Real Madrid, being widely regarded as one of the most accomplished coaches worldwide.

Diego Maradona: Diego Maradona, an Argentine football legend, was a renowned player and manager. He is considered among the greatest athletes in football history and was honored with the FIFA Player of the 20th Century award.

Franz Beckenbauer: Franz Beckenbauer, also known as der Kaiser, was a German football legend who achieved remarkable success as a player, manager, and official. He is widely considered one of the greatest players ever, having won the FIFA World Cup, the European Champions Cup, and the Ballon d'Or. Beckenbauer revolutionized the game by inventing the modern sweeper position, showcasing his versatility as a midfielder turned central defender.

Lev Yashin: Lev Yashin, a Soviet professional footballer, is considered the greatest goalkeeper ever. Known for his athleticism, positioning, and acrobatic saves, he had an imposing presence in goal. Yashin was also a deputy chairman of the Football Federation of the Soviet Union.

Kareem Abdul-Jabbar: Kareem Abdul-Jabbar, an American former professional basketball player, had a remarkable career in the NBA. He played for the Milwaukee Bucks and Los Angeles Lakers for 20 seasons, winning six MVP titles and earning a record 19 NBA All-Star selections. Abdul-Jabbar was renowned for his skills as a center, and he won six NBA championships as a player and two as an assistant coach. He holds the distinction of being the NBA's all-time leading scorer until 2023 when LeBron James surpassed his record. Regarded as one of the greatest players in history, Abdul-Jabbar's achievements speak volumes about his exceptional talent and influence in the sport.

Wilt Chamberlain: Wilt Chamberlain, a 7ft 1in tall American basketball legend, played center in the NBA for 14 seasons. He is widely considered one of the greatest basketball players ever, earning multiple Hall of Fame inductions. Chamberlain also participated in volleyball and served as league president before featuring in a movie. Notably, he boasted about having had sexual relations with 20,000 women.

LeBron James: LeBron James, also known as "King James," is an exceptional American basketball player for the Los Angeles Lakers in the NBA. Considered one of the greatest players in history, he has won four NBA championships and has appeared in 10 NBA Finals. He is often compared to Michael Jordan in debates about the best basketball player ever. Additionally, LeBron has earned two Olympic gold medals while representing the United States.

Magic Johnson: Magic Johnson, also known as Earvin "Magic" Johnson Jr., is a renowned American businessman and former professional basketball player. He is widely considered as the greatest point guard in basketball history. Johnson played 13 seasons in the NBA, leading the Los Angeles Lakers to five NBA championships during their Showtime era. He rose to prominence after winning a national championship in college and being selected as the first overall pick in the 1979 NBA draft. Johnson shocked the world when he announced his HIV diagnosis in 1991, but remarkably returned to win the All-Star MVP Award in 1992. Following a brief retirement due to controversy, he returned in 1996 for one final season before retiring for good.

Michael Jordan: Michael Jordan, also known as MJ, is a highly successful American businessman and former basketball player. He spent fifteen seasons in the NBA, winning six championships with the Chicago Bulls. Jordan is credited with popularizing basketball globally and is considered by many as the greatest player of all time.

Jackie Robinson: Jackie Robinson was a historic American baseball player who broke the color barrier in Major League Baseball. He became the first African American to play in the modern era when he started for the Brooklyn Dodgers on April 15, 1947. His signing with the Dodgers marked the end of racial segregation in professional baseball, which had forced black players into the Negro leagues since the 1880s. Robinson's significant contribution to the sport led to his induction into the Baseball Hall of Fame in 1962.

Sadaharu Oh: Sadaharu Oh, a Japanese baseball player and manager also known as Wang Chen-chih, holds the world record for most home runs with 868. He currently serves as the chairman of the Fukuoka SoftBank Hawks. Oh is renowned for establishing numerous Nippon Professional Baseball records in categories such as runs batted in (2,170), slugging percentage (.634), bases on balls (2,390), and on-base plus slugging percentage (OPS) (1.080). He received the People's Honour Award in 1977 and was inducted into the Japanese Baseball Hall of Fame in 1994.

Hank Aaron: Hank Aaron, also known as "Hammer" or "Hammerin' Hank," was a highly regarded professional baseball right fielder and designated hitter. He played for 23 seasons in Major League Baseball, primarily with the Milwaukee/Atlanta Braves in the National League. Aaron held numerous career power-hitting records, including breaking Babe Ruth's long-standing record for career home runs. He hit at least 24 home runs every year from 1955 to 1973 and is one of only two players to hit 30 or more home runs in a season more than fifteen times.

Ty Cobb: Ty Cobb, known as "the Georgia Peach," was a legendary American MLB center fielder. He spent most of his career with the Detroit Tigers and finished with the Philadelphia Athletics. Cobb received an impressive 98.2% of the votes for the National Baseball Hall of Fame in 1936 and was ranked third on the Sporting News' list of "Baseball's 100 Greatest Players."

Willie Mays: Willie Mays, also known as the "Say Hey Kid," was an exceptional center fielder in MLB. He is considered one of the greatest players of all time, ranking second only to Babe Ruth on various all-time lists. Mays played for the New York / San Francisco Giants and the New York Mets in the National League from 1951 to 1973.

Babe Ruth: 'Babe Ruth' is a legendary American baseball player who had a successful career in Major League Baseball (MLB) from 1914 to 1935. He started as a standout pitcher for the Boston Red Sox before becoming a renowned power-hitting outfielder for the New York Yankees. Nicknamed "the Bambino" and "the Sultan of Swat," Ruth is considered one of the greatest sports heroes and baseball players of all time. He was inducted into the Baseball Hall of Fame in 1936 as one of its inaugural members.

Don Bradman: Don Bradman, known as "The Don," was an Australian cricketer and is widely regarded as the greatest batsman of all time. With a career Test batting average of 99.94, he is considered to have achieved the greatest record in any major sport. His remarkable success in cricket has led many, including Shane Warne, to hail him as the greatest sportsperson in history.

Viv Richards: Viv Richards is a legendary cricketer from Antigua, known for representing the West Indies from 1974 to 1991. He batted at number three and is widely considered one of the greatest batsmen ever. Richards played a crucial role in winning the 1979 Cricket World Cup for his team.

Sachin Tendulkar: Sachin Tendulkar is a retired Indian cricketer, considered one of the greatest batsmen in cricket history. He holds records for the most runs in both One Day Internationals and Test matches. Tendulkar also received the most player of the match awards in international cricket. Additionally, he served as a Member of Parliament from 2012 to 2018.

Shane Warne: Shane Warne, known as Warnie, was a highly skilled Australian cricketer from 1992 to 2007. As a right-arm leg spin bowler and right-handed batsman, he played for Victoria, Hampshire, and Australia. With 145 Test matches, he took 708 wickets, setting a record for most wickets in Test cricket until 2007. Warne was part of the Australian team that won the 1999 Cricket World Cup, and is considered one of the greatest players ever.

W. G. Grace: W. G. Grace was a prominent English amateur cricketer regarded as one of the greatest players in the sport's history. He played a vital role in cricket's development and earned more money from it than professional players. Known for his competitiveness, he was both famous and controversial due to his gamesmanship and financial gains.

Garfield Sobers: Garfield Sobers, also known as Sir Gary or Sir Garry Sobers, is a former cricketer from the West Indies who played from 1954 to 1974. He is considered one of cricket's greatest all-rounders, excelling in bowling, batting, and fielding. Sobers is widely regarded as one of the greatest cricketers of all time.

Wayne Gretzky: Wayne Gretzky, a Canadian ice hockey legend, played 20 seasons in the NHL, earning the nickname "the Great One." He holds numerous records, including being the leading goal scorer, assist producer, and point scorer in NHL history. Gretzky achieved the remarkable feat of scoring over 200 points in a season four times, and he surpassed 100 points in 15 seasons consecutively. Retiring in 1999, he left a remarkable legacy, setting 61 NHL records in total.

Gordie Howe: Gordie Howe, a Canadian ice hockey legend, had a remarkable career spanning 32 years. Known as "Mr. Hockey," he played 26 seasons in the NHL and six in the WHA, primarily with the Detroit Red Wings. Howe held multiple NHL records, including 801 goals, 1,049 assists, and 1,850 total points until Wayne Gretzky surpassed them. He was a 23-time NHL All-Star and one of the greatest players ever. Howe's longevity was unparalleled, as he played in 1,767 NHL games, a record that was later surpassed by Patrick Marleau. In recognition of his exceptional contributions, Howe was named one of the "100 Greatest NHL Players" in 2017.

Tom Brady: Tom Brady is a legendary former American football quarterback who played in the NFL for 23 seasons. He had an impressive 20-year career with the New England Patriots and played a vital role in their dynasty from 2001 to 2019. In his last three seasons, he joined the Tampa Bay Buccaneers. Regarded as the greatest quarterback of all time, Brady's legacy is unmatched in the sport.

Jim Brown: Jim Brown was an American football fullback, civil rights activist, and actor. He played for the Cleveland Browns from 1957-1965 and is considered one of the greatest running backs in NFL history. Brown was a Pro Bowl invitee every season, a three-time AP NFL Most Valuable Player, and won an NFL championship with the Browns in 1964. He led the league in rushing yards in eight out of his nine seasons and holds numerous rushing records. In 2002, he was recognized as the greatest professional football player ever by The Sporting News.

Jerry Rice: Jerry Rice is an American former professional football player known for his 20-season career as a wide receiver in the NFL. He won three Super Bowl titles with the San Francisco 49ers and played briefly for the Oakland Raiders and Seattle Seahawks. Regarded as the greatest wide receiver of all time, Rice holds numerous records and is recognized as the most prolific wide receiver in NFL history. He was named the greatest player in NFL history by NFL Network's The Top 100: NFL's Greatest Players.

Margaret Court: Margaret Court, also known as Margaret Smith Court, was a renowned Australian tennis player and Christian minister. She held the world No. 1 ranking and is regarded as one of the greatest tennis players ever. Court's remarkable record includes 24 women's singles major titles and a total of 64 major titles, which remain unmatched in the history of tennis.

Roger Federer: Roger Federer, a Swiss former tennis player, held the world No. 1 singles ranking for a record 310 weeks. He won 103 ATP Tour singles titles, including 20 major men's singles titles and six year-end championships.

Steffi Graf: Steffi Graf, a German tennis player, holds the second-most major singles titles in women's tennis since 1968 and is ranked third for all-time wins. In 1988, she achieved the Golden Slam by winning all major singles tournaments and an Olympic gold in a single year, a feat unmatched by any other player. Remarkably, Graf has won each major singles tournament at least four times, a unique record in tennis history.

Rod Laver: Rod Laver, a retired Australian tennis player, was the indisputable world number 1 for five years from 1965 to 1969, and potentially in 1964 and 1970. He also held the top amateur ranking in 1961 and 1962. Laver holds the record for the most singles titles won in history, with 198 victories.

Suzanne Lenglen: Suzanne Lenglen, a French tennis player, dominated women's tennis in the 1920s. She held the world No. 1 ranking from 1921 to 1926 and won a total of eight Grand Slam titles. Lenglen achieved a remarkable six consecutive Wimbledon singles victories from 1919 to 1923. She also excelled in doubles and mixed doubles, winning multiple titles at Wimbledon. In addition to her amateur success, Lenglen was the first prominent player to turn professional. She is widely considered one of the greatest women's tennis players of all time.

Rafael Nadal: Rafael Nadal is a Spanish professional tennis player known for his outstanding achievements in the sport. He has been ranked world No. 1 in singles for 209 weeks and has finished as the year-end No. 1 five times. Nadal has won 22 Grand Slam men's singles titles, including a record 14 French Open titles. He has also won 92 ATP-level singles titles, including 36 Masters titles and an Olympic gold medal, with a remarkable 63 of these victories on clay courts. Nadal is one of only two men to achieve the Career Golden Slam in singles. Additionally, his 81 consecutive wins on clay mark the longest single-surface win streak in the Open Era.

Martina Navratilova: Martina Navratilova, a Czech former professional tennis player, is widely regarded as one of the greatest tennis players ever. She holds the record for the most major titles in the Open Era, with a total of 59. Navratilova's dominance in women's tennis during the 1970s and 1980s, alongside her rival Chris Evert, is particularly noteworthy.

Serena Williams: Serena Williams, an American former professional tennis player, is widely considered one of the greatest tennis players of all time. She held the world No. 1 ranking for 319 weeks, including a record-breaking 186 consecutive weeks. With 23 Grand Slam singles titles, she holds the most in the Open Era and is the only player to achieve a career Golden Slam in both singles and doubles.

Jack Nicklaus: Jack Nicklaus, nicknamed "the Golden Bear," is a retired American golfer widely regarded as one of the greatest of all time. He won 117 professional tournaments, including a record 18 major championships. His focus was on the Masters Tournament, U.S. Open, Open Championship, and PGA Championship. Nicklaus competed in the most major tournaments (164), and his 73 PGA Tour victories rank third in history. He is surpassed only by Sam Snead (82) and Tiger Woods (82).

Annika Sörenstam: Annika Sörenstam is a Swedish professional golfer and one of the best female golfers in history. She has won 90 international tournaments, including 72 official LPGA tournaments and ten majors. Sörenstam holds the record for the most wins by a female golfer. After retiring, she returned at age 50 and won the 2021 U.S. Senior Women's Open.

Tiger Woods: Tiger Woods, known as Eldrick Tont Woods, is an accomplished American golfer. He has achieved remarkable success, holding the record for tied first in PGA Tour wins and second in men's major championships. Widely considered one of the greatest golfers ever, Woods also holds several golf records. To honor his achievements, he has been inducted into the esteemed World Golf Hall of Fame.

Fanny Blankers-Koen: Fanny Blankers-Koen, a Dutch track and field athlete, achieved fame by winning four gold medals at the 1948 Summer Olympics. Despite being a 30-year-old mother of two, she earned the nickname "the Flying Housewife" for her remarkable performances. She remains the most successful athlete in the competition.

Usain Bolt: Usain Bolt, a Jamaican retired sprinter, is widely regarded as the greatest sprinter in history. He holds world records in the 100m, 200m, and 4x100m relay events.

Sergey Bubka: Sergey Bubka is a retired Ukrainian pole vaulter, known for representing the Soviet Union. He was named Athlete of the Year twice and was inducted into the International Association of Athletics Federations Hall of Fame in 2012.

Hicham El Guerrouj: Hicham El Guerrouj, a retired Moroccan middle-distance runner, holds the world record for the 1500 meters and mile events. He also previously held the world record for the 2000 meters. El Guerrouj is notable for being the only man since Paavo Nurmi to win gold medals in both the 1500 meters and 5000 meters at the same Olympic Games.

Florence Griffith Joyner: Florence Griffith Joyner, aka Flo-Jo, was an American track and field athlete known as the fastest woman ever. In 1988, she set world records in the 100m and 200m events. She gained popularity in the late 80s for her remarkable athleticism and unique personal style.

Haile Gebrselassie: Haile Gebrselassie, an Ethiopian former long-distance track athlete and businessman, is considered one of the greatest long-distance runners ever. He achieved two Olympic gold medals and four World Championship titles in the 10,000 meters. Additionally, he won four consecutive Berlin Marathons and three consecutive Dubai Marathons. Gebrselassie also holds four world titles indoors and was the 2001 World Half Marathon Champion.

Jackie Joyner-Kersee: Jacqueline Joyner-Kersee is a highly accomplished American track and field athlete, known for her success in the heptathlon and long jump events. Over the course of her career, she earned a remarkable total of three gold, one silver, and two bronze Olympic medals. Notably, she has been recognized as the Greatest Female Athlete of All-Time by Sports Illustrated for Women magazine. Additionally, she served on the board of directors for USA Track & Field (U.S.A.T.F.), the country's national governing body for the sport.

Carl Lewis: Carl Lewis is a renowned American track and field athlete. He dominated the sport from 1979 to 1996, winning nine Olympic gold medals and a silver medal, along with eight gold medals in World Championships. What sets him apart is his incredible achievement of winning the same individual event in four consecutive Olympic Games, a feat accomplished by only six athletes in history.

Edwin Moses: Edwin Moses is a former American track and field athlete. He earned gold medals in the 400m hurdles at the 1976 and 1984 Olympics. Moses achieved an incredible record of 107 consecutive finals victories and set the world record in the event four times, between 1977 and 1987. He also played a crucial role in the reform of Olympic eligibility and drug testing. Moreover, Moses became the first Chairman of the Laureus World Sports Academy in 2000, serving as an international service organization for top athletes.

Paavo Nurmi: Paavo Nurmi, also known as the "Flying Finn" or the "Phantom Finn," was a legendary Finnish runner who dominated distance running in the 1920s. He held 22 world records and won nine gold and three silver Olympic medals in 12 events. Nurmi was undefeated in 121 races and remained unbeaten in cross country and the 10,000 meters throughout his 14-year career.

Jesse Owens: Jesse Owens, an American track and field athlete, achieved remarkable success at the 1936 Olympic Games by winning four gold medals.

Wilma Rudolph: Wilma Rudolph, an American sprinter, overcame polio as a child and became an Olympic champion in track and field. She won a bronze medal in the 4 × 100-meter relay at the 1956 Olympics and three gold medals in the 1960 Olympics. Rudolph was regarded as the fastest woman in the world during the 1960s and was the first American woman to win three gold medals in track and field at a single Olympic Games.

Emil Zátopek: Emil Zátopek, the renowned Czech long-distance runner, achieved fame by winning three gold medals at the 1952 Summer Olympics in Helsinki. Notably, he triumphed in the 5,000 meters and 10,000 meters events. However, his remarkable story reached its peak when he unexpectedly competed in his first-ever marathon and clinched yet another gold. Due to his remarkable achievements, Zátopek earned the nickname "Czech Locomotive."

Yuzuru Hanyu: Yuzuru Hanyu is a Japanese figure skater acclaimed for winning two Olympic gold medals, two World Championships, and four Grand Prix Finals. He is also a successful ice show producer and has won multiple national championships in Japan. Hanyu has achieved seven world championship medals, including bronze and silver finishes on separate occasions.

Sonja Henie: Sonja Henie was a Norwegian figure skater and actress who achieved numerous achievements in her career. She won three Olympic gold medals, ten World championships, and six European championships in women's singles. Henie holds the record for the most Olympic and World titles for a female figure skater. She is also one of two skaters to successfully defend a ladies' singles Olympic title, alongside Katarina Witt, and her six European titles have only been equaled by Witt.

Muhammad Ali: Muhammad Ali, an American boxer and activist, was nicknamed "the Greatest" and is considered one of the most important sports figures of the 20th century. He held various heavyweight titles, including the Ring magazine title from 1964-1970 and the undisputed championship from 1974-1978. In 1999, he was recognized as Sportsman of the Century by Sports Illustrated and the Sports Personality of the Century by the BBC.

Joe Louis: Joe Louis was a legendary American boxer, known as "the Brown Bomber". He fought professionally from 1934 to 1951 and is considered one of the greatest boxers ever. Louis held the world heavyweight title from 1937 to 1949, winning 25 consecutive title defenses, a record in all weight classes. His reign as champion was the longest in boxing history.

Sugar Ray Robinson: Sugar Ray Robinson, born Walker Smith Jr., was a legendary American professional boxer from 1940 to 1965. Inducted into the International Boxing Hall of Fame in 1990, he is widely considered the greatest pound-for-pound boxer in history.

Aleksandr Karelin: Aleksandr Karelin: Russian politician, retired athlete.

Kanō Jigorō: Kanō Jigorō was a Japanese educator, athlete, and founder of Judo, which became an internationally recognized martial art and an official Olympic sport. He introduced the use of black and white belts and the ranking system to show relative skill levels. His mottoes emphasized the efficient use of energy and the importance of mutual welfare and benefit.

Bruce Lee: Bruce Lee was a Hong Kong-American martial artist and actor who founded Jeet Kune Do, a hybrid martial arts philosophy. He is considered a highly influential martial artist and pop culture icon, bridging the gap between East and West. Additionally, Lee promoted Hong Kong action cinema and improved the portrayal of Chinese people in American films.

Eddy Merckx: Eddy Merckx is a Belgian cyclist, widely regarded as the most successful rider in cycling history. He has won eleven Grand Tours, all five Monuments, set the hour record, won three World Championships, numerous one-day races, and achieved extensive wins on the track.

Nadia Comăneci: Nadia Comăneci, a retired Romanian gymnast, is a five-time Olympic gold medalist, winning all medals in individual events. At age 14 in 1976, she became the first gymnast to receive a perfect score of 10.0 at the Olympics, earning her three gold medals. Comăneci also won two more gold medals, with two additional perfect 10s, at the 1980 Olympics. Throughout her career, she earned a total of nine Olympic medals and four medals at the World Artistic Gymnastics Championships.

Larisa Latynina: Larisa Latynina, a former Soviet artistic gymnast, holds numerous records in Olympic gymnastics. Between 1956 and 1964, she won a total of 18 Olympic medals, including 9 golds, making her the gymnast with the most Olympic gold medals in history. She also held the record for individual event medals with 14 for over 52 years. Latynina played a significant role in establishing the Soviet Union as a dominant force in gymnastics.

Juan Manuel Fangio: Juan Manuel Fangio, the Argentine racing car driver known as El Chueco or El Maestro, achieved remarkable dominance in the early years of Formula One. He won the prestigious World Drivers' Championship an impressive five times, solidifying his status as a legendary figure in motorsport history.

Michael Schumacher: Michael Schumacher, a German former racing driver, is renowned for his successful career in Formula One. Competing for Jordan, Benetton, Ferrari, and Mercedes, Schumacher holds the record for the joint-most World Drivers' Championship titles with seven. He also achieved the most wins (91), pole positions (68), and podium finishes (155) until they were surpassed by Lewis Hamilton. Schumacher holds records for consecutive Drivers' Championships and total fastest laps (77), among others.

Ayrton Senna: Ayrton Senna was a Brazilian Formula One driver who won the World Championship three times. He held the record for the most pole positions until 2006, and won 41 Grands Prix. Unfortunately, he died in a tragic accident during the 1994 San Marino Grand Prix.

Michael Phelps: Michael Phelps is a retired American swimmer, best known for being the most successful and decorated Olympian of all time. He holds the record for the most Olympic medals with a total of 28, including 23 gold medals. Phelps also holds the records for the most Olympic gold medals in individual events (13) and the most medals in individual events (16). He tied the record for the most medals at a single Olympic Games with eight in 2004, and broke the record for the most gold medals at a single Games with eight in 2008. Phelps continued his success in 2012 and 2016, solidifying his position as the most successful athlete in those Olympics.

Mark Spitz: Mark Spitz is an American swimmer and nine-time Olympic champion. He won seven gold medals at the 1972 Summer Olympics in Munich, setting world records for each. His record stood for 36 years until Michael Phelps won eight gold medals in 2008.

Johnny Weissmuller: Johnny Weissmuller was a renowned American athlete who excelled in competitive swimming, water polo, and later in his career, acting. He held numerous world records and won a total of five gold medals in two consecutive Summer Olympics. At the 1924 Olympics in Paris and the 1928 Olympics in Amsterdam, Weissmuller triumphed in the 100m freestyle and the 4 × 200m relay team event. Additionally, he won gold in the 400m freestyle and earned a bronze medal in water polo in Paris.

Gareth Edwards: Gareth Edwards, a Welsh former rugby player, was considered one of the greatest players to represent Wales. He played as a scrum-half and was praised by the BBC.

Jonah Lomu: Jonah Lomu, a New Zealand rugby player, was the first global superstar of rugby. He had a significant impact on the game and is widely regarded as one of the greatest players in the sport's history. Lomu is considered one of the most talented sportsmen ever.

Bobby Fischer: Bobby Fischer, an American chess grandmaster, was the eleventh World Chess Champion. He became a prodigy, winning his first of a record eight US Championships at the age of 14. In 1964, he achieved a perfect score of 11-0, a tournament record. Fischer qualified for the 1972 World Championship by dominating opponents like Mark Taimanov and Bent Larsen with 6-0 scores. He then defeated Tigran Petrosian to challenge Boris Spassky of the USSR and won the title match in Reykjavík, Iceland, attracting global interest as a Cold War contest between the US and USSR.

Garry Kasparov: Garry Kasparov is a Russian chess grandmaster, former World Chess Champion, and political activist. He held the highest FIDE chess rating until 2013 and was ranked world no. 1 for a record 255 months. Kasparov achieved the most consecutive professional tournament victories and won the most Chess Oscars.

Ole Einar Bjørndalen: Ole Einar Bjørndalen, a retired Norwegian biathlete and coach, is known as the "King of Biathlon." He holds 13 Winter Olympic Games medals, the second highest in history, and 45 medals at the Biathlon World Championships. With 95 World Cup wins, he is the all-time leader and has won the Overall World Cup title six times.

Edmund Hillary: Sir Edmund Percival Hillary was a New Zealand mountaineer and explorer. He, along with Tenzing Norgay, was the first to reach the summit of Mount Everest in 1953. He also served as New Zealand's High Commissioner to India and Bangladesh and Ambassador to Nepal.

Tenzing Norgay: Tenzing Norgay, also known as Sherpa Tenzing, was a Nepalese-Indian Sherpa mountaineer. He was one of the first two people to reach the summit of Mount Everest on 29 May 1953, alongside Edmund Hillary. Norgay was named one of the 100 most influential people of the 20th century by Time magazine.

Junko Tabei: Junko Tabei was a Japanese mountaineer and author who became the first woman to reach the summit of Mount Everest. She also accomplished the remarkable feat of ascending the highest peak on every continent, known as the Seven Summits.

Steve Redgrave: Steve Redgrave is a British retired rower who achieved incredible success at the Olympics, winning gold medals in five consecutive Games from 1984 to 2000. He also earned three gold medals at the Commonwealth Games and nine golds at the World Rowing Championships. Redgrave holds the record for being the most successful male rower in Olympic history and is the sole endurance sport athlete to win gold medals in five Olympics.

Marit Bjørgen: Marit Bjørgen is a retired Norwegian cross-country skier and the most successful athlete in Winter Olympics history. She holds the record for the most medals won, with a total of 15. Bjørgen also tops the all-time Cross-Country World Cup rankings with 114 individual victories, including 29 sprint victories. Her exceptional performance at the 2010 Winter Olympics, where she won five medals including three gold, solidified her status as a dominant force in the sport. At the 2018 Pyeongchang Games, she added five more medals to her collection, further cementing her legacy as one of the greatest cross-country skiers of all time.

Ingemar Stenmark: Ingemar Stenmark is a Swedish skiing champion, known as the greatest slalom and giant slalom specialist in history. He competed for Tärna IK Fjällvinden and is considered one of the most prominent Swedish athletes.

Bonnie Blair: Bonnie Blair is a retired American speed skater and one of the most successful athletes in Olympic history. She competed in four Olympics, winning five gold medals and one bronze medal for the United States.

Eric Heiden: Eric Heiden is an American physician and former long track speed skater, road cyclist, and track cyclist. He achieved the remarkable feat of winning five individual gold medals and setting multiple Olympic and world records at the 1980 Winter Olympic Games. He is the most successful Winter Olympian from a single edition and delivered the Athlete's Oath at the same games. Heiden's coach was Dianne Holum.

Jim Thorpe: Jim Thorpe was an American athlete and Olympic gold medalist. He was the first Native American to win a gold medal for the United States in the Olympics. Thorpe was known for his versatility in sports and won two Olympic gold medals in the 1912 Summer Olympics. He excelled in football, professional baseball, and basketball as well.

Babe Didrikson Zaharias: Babe Didrikson Zaharias was a versatile American athlete who achieved success in multiple sports, including golf, basketball, baseball, and track and field. At the 1932 Summer Olympics, she won two gold medals and a silver in track and field events. Later, she transitioned to professional golf and became the winner of 10 LPGA major championships.

Luciana Aymar: Luciana Aymar, an Argentine field hockey player, is known for her remarkable skill. Having retired, she is regarded as one of the greatest players in the sport's history.

Dhyan Chand: Dhyan Chand was an Indian field hockey player considered the greatest in history. He had exceptional ball control, scoring numerous goals and winning three Olympic gold medals in 1928, 1932, and 1936. His influence extended to India dominating field hockey, winning seven out of eight Olympic events from 1928 to 1964.

James Naismith: James Naismith, a Canadian-American physical educator and physician, invented the game of basketball. He wrote the original basketball rule book and established the University of Kansas basketball program in the United States. Basketball was later included in the Olympic Games and Naismith witnessed its growth, as well as the creation of the National Invitation Tournament and the NCAA Tournament.

Pierre de Coubertin: Pierre de Coubertin, a French educator and historian, is known as the father of modern Olympic Games. He co-founded the International Olympic Committee, serving as its second president, and was passionate about promoting sports in French schools.

Warren Buffett: Warren Buffett is an influential American businessman, investor, and philanthropist, renowned for co-founding, chairing, and serving as the CEO of Berkshire Hathaway. With a net worth of $122 billion as of January 2024, he is recognized as one of the world's most successful investors, earning widespread recognition and acclaim.

Jakob Fugger: Jakob Fugger of the Lily, also known as Jakob Fugger the Rich, was a prominent German merchant, miner, and banker from the Fugger family in Augsburg. He expanded the family business throughout Europe, had an extensive education in Venice, and held various clerical roles. Despite living in a monastery, Jakob studied investment history in early Asian markets. His wealth is estimated to be about $400 billion today, equivalent to 2% of Europe's GDP at that time.

Andrew Mellon: Andrew Mellon, also known as A. W. Mellon, was an influential American businessman, politician, and philanthropist from the wealthy Mellon family. He served as the U.S. Secretary of the Treasury from 1921 to 1932, overseeing the prosperous 1920s and the devastating Wall Street Crash of 1929. As a conservative Republican, Mellon prioritized reducing taxation and national debt after World War I. Additionally, he played a role in funding and managing Kennywood Park in Pennsylvania.

J. P. Morgan: J.P. Morgan was a prominent American financier and investment banker. He played a significant role in shaping corporate finance during the Gilded Age and Progressive Era. As the head of his eponymous banking firm, he was instrumental in driving industrial consolidations in the United States in the early 1900s.

Rothschild family: The Rothschild family is a wealthy Ashkenazi Jewish noble banking family from Frankfurt. They gained prominence through Mayer Amschel Rothschild who established a banking business in the 1760s. His five sons expanded the family's influence by setting up businesses in major European cities. The family achieved noble status in the Holy Roman Empire and the United Kingdom. Their documented history dates back to 16th century Frankfurt, named after their family house, Rothschild, built in 1567.

Bill Gates: Bill Gates is a renowned American businessman, investor, philanthropist, and writer. He co-founded Microsoft with Paul Allen and played various key roles within the company, including chairman, CEO, president, and chief software architect. Gates was a major player in the microcomputer revolution during the 1970s and 1980s.

Steve Jobs: Steve Jobs, an American entrepreneur, co-founded Apple Inc., NeXT, and Pixar. He played a vital role in the personal computer revolution with Steve Wozniak.

Estée Lauder (businesswoman): Estée Lauder, an influential American businesswoman, co-founded her eponymous cosmetics company with her husband, Joseph Lauter. She was recognized as the only woman on Time magazine's list of the 20 most influential business geniuses of the 20th century in 1998.

John D. Rockefeller: John D. Rockefeller was an American business magnate and philanthropist. He founded the Standard Oil Company in 1870, becoming the richest person in modern history. Born in Upstate New York, he started as an assistant bookkeeper and later focused on oil refining. Even after his retirement, Rockefeller devoted his immense wealth and energy to philanthropy, particularly in education, medicine, and modernizing the American South.

George Westinghouse: George Westinghouse Jr. was an American entrepreneur and engineer known for inventing the railway air brake and pioneering the use of alternating current for electric power distribution. He competed with Thomas Edison's direct current system and founded the Westinghouse Electric Corporation in 1886. Westinghouse's contributions earned him the prestigious Edison Medal in 1911.

Rupert Murdoch: Rupert Murdoch is an Australian-born American media mogul and investor, known for owning a vast empire of publishing outlets worldwide. He controls News Corp, which includes prominent media assets like HarperCollins, Fox News, and Sky News Australia. With a net worth of $21.7 billion, Murdoch ranks among the richest individuals, as reported by Forbes.

David Sarnoff: David Sarnoff, a Russian-American businessman, played a vital role in the development of radio and television in the United States. He served as a leader in RCA, starting shortly after its establishment in 1919, and held various positions until his retirement in 1970.

Ted Turner: Ted Turner, an American entrepreneur and media pioneer, is known for founding CNN, the first 24-hour cable news channel. He also created WTBS, a superstation concept that became TBS. Additionally, Turner has been active in philanthropy.

Andrew Carnegie: Andrew Carnegie was an American industrialist who played a major role in the expansion of the steel industry in the late 19th century. He became incredibly wealthy and used his fortune to become a leading philanthropist. In his later years, Carnegie donated around $350 million, most of his wealth, to charities, foundations, and universities. He also wrote an influential article in 1889 advocating for the rich to use their wealth to benefit society and supported progressive taxation and an estate tax. His actions inspired a significant increase in philanthropy.

Jamsetji Tata: Jamsetji Tata was an Indian industrialist who founded the Tata Group, India's largest conglomerate. He is renowned as a great philanthropist and established the city of Jamshedpur.

John Jacob Astor: John Jacob Astor was a German-born American businessman, known for his success in the fur trade, opium smuggling, and real estate investments. He was the first prominent member of the Astor family and the first multi-millionaire in the United States.

Li Ka-shing: Summary: Li Ka-shing, a Hong Kong billionaire business magnate, investor, and philanthropist, is the senior advisor for CK Hutchison Holdings and CK Asset Holdings, where he oversees port investments and operates the largest health and beauty retailer in Asia and Europe. With an estimated net wealth of US$37.7 billion, he is currently the 33rd richest person in the world as of July 2023.

Carlos Slim: Carlos Slim is a Mexican business magnate, investor, and philanthropist. He was once the richest person in the world and derives his fortune from his extensive holdings in Mexican companies. As of December 2023, he is ranked as the 11th-richest person globally with a net worth of $105 billion, making him the richest person in Latin America.

George Soros: George Soros is a Hungarian-American billionaire hedge fund manager and philanthropist. He has a net worth of $6.7 billion and is known for donating over $32 billion to the Open Society Foundations. He is considered the "most generous giver" by Forbes and resides in New York.

Sam Walton: Sam Walton was an American business magnate who founded Walmart and Sam's Club in the 1960s and 1980s. His company, Wal-Mart Stores Inc., became the world's largest corporation by revenue and the largest private employer globally. Walton was the richest person in the United States for a time, and his family remains the richest in the country. He passed away in 1992 at the age of 74 due to blood cancer and was buried in Bentonville, Arkansas.

Enzo Ferrari: Enzo Ferrari, also known as Il Commendatore or Il Drake, was an influential Italian motor racing driver, entrepreneur, and founder of the Scuderia Ferrari Grand Prix team. He later established the iconic Ferrari automobile brand. In his later years, he was nicknamed L'Ingegnere or Il Grande Vecchio.

Henry Ford: Henry Ford was an American industrialist, founder of Ford Motor Company, and pioneer of assembly line production. He revolutionized the automobile industry by making affordable cars for the middle class, which greatly impacted society in the 20th century.

Howard Hughes: Howard Hughes was an influential and wealthy American who excelled in aerospace engineering, business, film production, investment, philanthropy, and piloting. He became prominent as a film producer and made significant contributions to the aviation industry. However, later in life, his eccentric behavior and reclusive nature were attributed to his worsening obsessive-compulsive disorder, chronic pain, and increasing deafness resulting from a near-fatal plane crash.

Leland Stanford: Leland Stanford was a prominent American attorney, industrialist, and philanthropist. He briefly served as the 8th Governor of California before becoming a United States Senator. Alongside his wife, Jane, he founded Stanford University as a memorial to their deceased son.

Cornelius Vanderbilt: Cornelius Vanderbilt, known as "the Commodore," was a prominent American business tycoon who amassed his fortune through railroads and shipping. Starting with his father's business, he gained prominence in the inland water trade before becoming a major investor in the booming railroad industry, greatly influencing the nation's transportation landscape.

Marcus Licinius Crassus: Marcus Licinius Crassus was a Roman general and statesman who played a pivotal role in transitioning the Roman Republic into the Roman Empire. He was famously known as "the richest man in Rome."

Josiah Wedgwood: Josiah Wedgwood, an English potter, entrepreneur, and abolitionist, founded the Wedgwood company in 1759. He pioneered the industrialization of European pottery by experimenting with improved pottery bodies.

Hanno the Navigator: Hanno the Navigator, a Carthaginian explorer of the 5th century BC, sailed along the western coast of Africa. His voyage, documented in a Greek translation called periplus, is his sole known source. He is occasionally speculated to be a king.

Zhang Qian: Zhang Qian, a Chinese diplomat and explorer during the Western Han dynasty, was one of the earliest official diplomats to bring back crucial information about Central Asia to the Han dynasty imperial court. He discovered remains from the Greco-Bactrian and Parthian Empires, providing valuable knowledge to Emperor Wu of Han.

Ibn Battuta: Ibn Battuta, a renowned Maghrebi traveller, explored and studied various regions including North Africa, the Middle East, East Africa, Central Asia, South Asia, Southeast Asia, China, the Iberian Peninsula, and West Africa between 1325 and 1354. His extensive journeys led him to write a detailed account of his experiences titled "A Gift to Those Who Contemplate the Wonders of Cities and the Marvels of Travelling," also known as "The Rihla."

Leif Erikson: Leif Erikson, also known as Leif the Lucky, was a Norse explorer believed to be the first European to reach continental America. He established a Norse settlement in Vinland (coastal North America) and there is speculation that it corresponds to L'Anse aux Meadows in Newfoundland, Canada.

Marco Polo: Marco Polo was a Venetian merchant, explorer, and writer who traveled through Asia along the Silk Road between 1271 and 1295. His travels, documented in The Travels of Marco Polo, provided Europeans with their first in-depth understanding of the Eastern world. His book revealed the wealth and vastness of the Mongol Empire, China during the Yuan Dynasty, as well as insights into Persia, India, Japan, and other Asian cities and countries.

Xuanzang: Xuanzang, a Chinese Buddhist monk in the 7th century, made major contributions to Chinese Buddhism. He embarked on a remarkable journey to India (629–645 CE) and brought back over 657 Indian texts. Though he could only translate 75 out of 1335 chapters, his translations included important Mahayana scriptures.

Zheng He: Zheng He was a renowned Chinese mariner, explorer, and fleet admiral during the Ming dynasty. He is considered the greatest admiral in Chinese history. Commissioned by two emperors, he led seven treasure voyages to various regions from 1405 to 1433. His ships were legendary for their size, carrying hundreds of sailors on four decks and unprecedented dimensions.

Vitus Bering: Vitus Bering was a Danish cartographer and explorer who served in the Russian Navy. He led the First Kamchatka Expedition and the Great Northern Expedition, exploring the Asian and North American coasts. Several geographical landmarks bear his name, including the Bering Strait, Bering Sea, Bering Island, Bering Glacier, and Vitus Lake.

Pedro Álvares Cabral: Pedro Álvares Cabral, a Portuguese explorer, discovered Brazil and was the first person to set foot on four continents in 1500. He conducted a significant exploration of South America's northeast coast, claiming it for Portugal. Cabral had a good education and came from a minor noble family. He was appointed to lead an expedition to India with the goal of establishing trade relations and bypassing the Arab, Turkish, and Italian spice trade monopoly. Cabral's voyage marked the first known expedition to touch Europe, Africa, America, and Asia.

Jacques Cartier: Jacques Cartier was a French-Breton explorer who mapped the Gulf of Saint Lawrence and the shores of the Saint Lawrence River. He named this region "The Country of Canadas" after the native settlements he encountered.

Christopher Columbus: Christopher Columbus, an Italian explorer and navigator, completed four voyages across the Atlantic Ocean sponsored by the Catholic Monarchs of Spain. His expeditions were the first European contact with the Caribbean, Central, and South America, opening the way for widespread European exploration and colonization of the Americas.

James Cook: James Cook was a British explorer known for his three expeditions to the Pacific Ocean between 1768 and 1779. He made important contributions to cartography by creating detailed maps of Newfoundland. Cook was the first European to make contact with the eastern coast of Australia and the Hawaiian Islands. He also completed the first recorded circumnavigation of New Zealand.

Vasco da Gama: Vasco da Gama was a Portuguese explorer and the first European to reach India by sea.

Ferdinand Magellan: Ferdinand Magellan was a Portuguese explorer who led the 1519 Spanish expedition to the East Indies. He planned and navigated the first European voyage to Asia via the Pacific Ocean, discovering a passage that now bears his name. Magellan's main achievement was opening a new maritime trade route, establishing important connections between Europe and Asia.

Juan Ponce de León: Juan Ponce de León, a Spanish explorer and conquistador, led the first European expeditions to Puerto Rico in 1508 and Florida in 1513. Born in Valladolid, Spain in 1474, he came from a noble background and served in the Spanish military. He journeyed to the Americas as part of Christopher Columbus's second expedition in 1493.

Hernando de Soto: Hernando de Soto was a Spanish explorer and conquistador known for his expeditions in Nicaragua, the Yucatan Peninsula, and Peru. He led the first European expedition into the modern-day United States and was the first European to cross the Mississippi River.

Abel Tasman: Abel Tasman was a Dutch seafarer and explorer who completed significant voyages for the Dutch East India Company in the 17th century.

Amerigo Vespucci: Amerigo Vespucci, an Italian explorer and navigator from Florence, was instrumental in giving America its name.

Willem Barentsz: Willem Barentsz, also known as William Barents or Barentz, was a Dutch explorer, navigator, and cartographer who is recognized for his extensive Arctic exploration.

Roald Amundsen: Roald Amundsen, a Norwegian explorer, played a vital role in the Heroic Age of Antarctic Exploration. He was an adventurous figure known for his expeditions to polar regions.

Amelia Earhart: Amelia Earhart, an American aviation pioneer, set records as the first female aviator to fly solo across the Atlantic Ocean. She advocated for commercial air travel and co-founded The Ninety-Nines, an organization for female pilots. Additionally, she authored popular books about her flying experiences.

Alexander von Humboldt: Alexander von Humboldt was a polymath and explorer. His work on botanical geography laid the foundation for biogeography. He also pioneered modern geomagnetic and meteorological monitoring through his measurement advocacy.

Charles Lindbergh: Charles Lindbergh was an American aviator who made the first solo nonstop flight from New York City to Paris in 1927, covering a distance of 3,600 miles in 33.5 hours. His aircraft, the Spirit of St. Louis, was built to compete for the Orteig Prize. This flight marked a significant milestone in aviation history and paved the way for global air transportation.

David Livingstone: David Livingstone was a Scottish colonialist, physician, Christian missionary, and explorer in Africa. He had mythic status as a Protestant martyr, inspirational figure, scientist, imperial reformer, anti-slavery activist, and advocate of British expansion. He was married to Mary Moffat Livingstone and became a highly revered British hero in the late 19th century.

Fridtjof Nansen: Fridtjof Nansen, a Norwegian polymath and Nobel Peace Prize laureate, was a renowned explorer, scientist, diplomat, and humanitarian. Notably, he co-founded the Fatherland League and made significant contributions in various spheres throughout his life.

Robert Falcon Scott: Robert Falcon Scott was a British explorer and naval officer who led two significant expeditions to the Antarctic: the Discovery expedition from 1901 to 1904 and the Terra Nova expedition from 1910 to 1913.

Ernest Shackleton: Ernest Shackleton, an Anglo-Irish explorer, led three British expeditions to the Antarctic during the Heroic Age of Antarctic Exploration.

Neil Armstrong: Neil Armstrong: American astronaut, engineer, and professor. First person to walk on the Moon in 1969. Also a naval aviator and test pilot.

Yuri Gagarin: Yuri Gagarin was a Soviet pilot and cosmonaut who became the first human to journey into outer space aboard Vostok 1. He completed one orbit of Earth in 108 minutes on 12 April 1961. Gagarin's achievement in the Space Race made him an international celebrity and he received many medals and titles, including the Hero of the Soviet Union.

Valentina Tereshkova: Valentina Tereshkova is a Russian engineer, politician, and former cosmonaut. She made history as the first woman in space, flying a solo mission on Vostok 6 in 1963. During her nearly three-day orbit, she circled the Earth 48 times. Tereshkova is the only woman to have embarked on a solo space mission and is the sole surviving cosmonaut from the Vostok program. Notably, she held the record as the youngest woman in space until 2023 when Anastatia Mayers flew a suborbital mission at the age of 18. However, since Mayers' flight was not an orbital one, Tereshkova remains the youngest woman to have flown in Earth's orbit.

J. Edgar Hoover: J. Edgar Hoover was an influential American law enforcement administrator who served as the final Director of the Bureau of Investigation (BOI) and the first Director of the Federal Bureau of Investigation (FBI). He was appointed by President Calvin Coolidge in 1924 and played a crucial role in establishing the FBI in 1935. Hoover served as the director for an impressive 48 years, leading both the BOI and the FBI, and worked under eight different Presidents until his death in 1972.

Heinrich Himmler: Heinrich Himmler was the powerful Reichsführer of the Schutzstaffel, a key leader in the Nazi Party, and a major orchestrator of the Holocaust.

Pablo Escobar: Pablo Escobar was a Colombian drug lord and politician who founded and led the Medellín Cartel. Known as "the king of cocaine," he became one of the richest criminals in history, accumulating a net worth of around $30 billion. His cartel dominated the cocaine trade into the United States during the 1980s and early 1990s.

Al Capone: Al Capone, also known as "Scarface," was an influential American gangster and businessman. He co-founded and led the Chicago Outfit during the Prohibition era from 1925 to 1931. Capone's reign as a crime boss came to an end when he was imprisoned at the age of 33.

Osama bin Laden: Osama bin Laden was a Saudi-born Islamic dissident and militant leader, who founded and led the terrorist organization al-Qaeda from 1988 until his death in 2011. He was the mastermind behind the September 11 attacks and his group is recognized as a terrorist organization by numerous entities including the United Nations Security Council, NATO, and the European Union.

Nostradamus: Nostradamus, a renowned French astrologer, apothecary, physician, and seer, is famous for his book Les Prophéties. This collection of 942 poetic quatrains supposedly foretells future events.

Human history: Human history is the story of how modern humans emerged in Africa 300,000 years ago. Initially, they lived as hunter-gatherers and later migrated out of Africa during the Last Glacial Period. By the end of the Ice Age, approximately 12,000 years ago, they had settled across much of the Earth.

History: History is the organized examination and recording of humanity's past events and developments.

Historical method: The historical method is a set of techniques used by historians to study and document past events. It involves analyzing primary and secondary sources, as well as material evidence like archaeology, to construct an accurate and reliable narrative. Historians skillfully identify sources, evaluate their authority, and combine their evidence to create a comprehensive picture of the past.

Civilization: A civilization is a complex society with key features including advanced governance, social hierarchy, urban development, and non-verbal forms of communication.

Archive: An archive is a collection of historical records or materials in any form, housed in a physical facility.

Archaeology: Archaeology is the study of human activity by analyzing material culture like artifacts, architecture, and ecofacts. It is both a social science and a humanities discipline, often classified as part of anthropology, history, or geography.

Archaeological culture: An archaeological culture is a collection of artifacts, buildings, and monuments from a specific time and place that represent the material remains of a past human society. It helps archaeologists understand and interpret ethnic and political groups, although debates about their connections are common. This concept is crucial in culture-historical archaeology.

Archaeological excavation: Archaeological excavation involves uncovering, studying, and documenting ancient artifacts and structures. It takes place at specific excavation sites or "digs" that can vary in size and duration of the project.

Radiocarbon dating: Radiocarbon dating is a technique that uses the behavior of a radioactive form of carbon to determine the age of organic materials.

Chronology: Chronology is the science of organizing events based on their order in time. It involves creating timelines or sequences of events and determining the actual sequence of past events.

Diplomatics: Diplomatics is a scholarly field that analyzes historical documents. It examines the conventions, protocols, and formulae used by document creators to understand how documents are created, information is transmitted, and the relationship between recorded facts and reality.

Epigraphy: Epigraphy is the study of inscriptions, including the identification and interpretation of the symbols used, their historical context, and cultural significance. It excludes the artistic value and historical importance as a document. An epigrapher is responsible for reconstructing, translating, and dating inscriptions. Epigraphy is essential for archaeology and is considered an auxiliary science of history. It can also aid in identifying forgeries.

Genealogy: Genealogy is the study of family lineage and history. It involves tracing lineages using oral interviews, historical records, genetics, and other sources. Genealogists use this information to demonstrate kinship and create pedigrees. The results are often presented in charts or narratives. Beyond genealogy, family history also encompasses community history and biographies.

Heraldry: Heraldry is the study of armorial bearings, including the design and display of coats of arms on shields, as well as related disciplines such as vexillology. Armory is the most well-known branch, focusing on the design and transmission of heraldic achievements which typically include a coat of arms, helmet, crest, and other accompanying symbols like supporters, badges, banners, and mottoes.

Historiography: Historiography is the study of how historians develop history as an academic discipline. It encompasses the body of historical work on a specific subject, examining the sources, techniques, and theoretical approaches used by historians. Historiography is discussed by topic and different approaches, such as political and social history. Since the nineteenth century, there has been a growth in historiographic literature. The influence of historians' own affiliations, like their loyalty to their nation, is a topic of debate.

Conspiracy theory: Conspiracy theory: Explanation for an event that suggests a powerful and secretive group is behind it, often politically motivated. Associated with prejudice, emotional conviction, or lack of evidence. Different from a conspiracy, it opposes mainstream consensus by qualified experts.

Palaeography: Palaeography is the study of historical writing systems and manuscripts. It includes deciphering and dating manuscripts, analyzing handwriting and printed media. The discipline also considers the cultural context of writing and the methods of production. Palaeography helps understand and authenticate historic texts, but precise dating requires interdisciplinary inquiry.

Flag: A flag is a piece of fabric with a distinctive design and colors used as a symbol, signal, or decoration. Flags also serve as graphic tools for basic communication and identification, especially in challenging environments. They are grouped into families based on design. The study of flags is called vexillology.

National flag: A national flag is a symbolic flag representing a nation, flown by both the government and citizens. It is designed with specific meanings for colors and symbols, often used separately as national symbols. The design of a national flag can be changed after significant historical events. Burning or destroying a national flag holds great symbolic significance.

History of art: The history of art explores the creation of objects by humans for various purposes, with a main emphasis on their visual appeal. It encompasses spiritual, narrative, philosophical, symbolic, documentary, decorative, and functional aspects. Art can be categorized into fine arts and applied arts, and it spans various media like architecture, sculpture, painting, film, photography, and graphic arts. Advancements in technology have led to the emergence of video art, computer art, performance art, animation, television, and videogames.

History of architecture: The history of architecture explores changes in buildings across cultures and time periods. It encompasses diverse traditions, stylistic trends, and dates. Architecture began with humans seeking shelter and safety. The term encompasses more than just buildings, including urbanism, civil engineering, naval, military, and landscape architecture.

History of film: The history of film traces the evolution of a visual art form that emerged in the late 19th century, utilizing film technologies.

History of literature: The history of literature refers to the progression of written works in prose or poetry that aim to entertain or educate readers. It also includes the development of literary techniques used to communicate these works. Not all writings are considered literature, as certain recorded materials, like data compilations, are excluded. This summary concentrates on the evolution of the defined works.

History of music: The history of music is a topic of great debate, as its origins are not clearly identified. It is considered a universal cultural practice, present in every known culture. There are varying theories on whether music predates, coexists, or follows the development of language. Many scholars have proposed different ideas, but no consensus has been reached. Different cultures have their own myths and beliefs about the invention of music, often tied to their religion, philosophy, or mythology.

History of opera: Opera, which emerged in 1597 with the creation of the first opera called Dafne by Jacopo Peri, has a relatively short history in the context of music. Since its inception, it has evolved alongside different musical trends, ultimately becoming associated with the contemporary concept of classical music.

History of theatre: The history of theatre is a study of its development over 2,500 years. It involves distinguishing theatre as an art form and entertainment from other performative activities. The focus is on the origin and growth of theatre as an independent activity since ancient Athens. Theatre traditions have thrived globally since the 5th century BC.

History of human sexuality: The impact of human sexuality on cultures since ancient times, encompassing its taboos, regulation, and social and political influence, is explored in the History of human sexuality.

History of philosophy: The history of philosophy is the study of how philosophical thought has evolved over time. It examines rational inquiry and argumentation, while some theories encompass myths, religion, and proverbs.

History of atheism: The history of atheism is rooted in the absence of belief in deities. Atheism asserts that there are no gods and rejects statements suggesting otherwise. Dating back to the sixteenth century, the term "atheist" emerged in English, and atheistic ideas have a significant historical influence.

History of political thought: The history of political thought is the study of chronological and conceptual transformations in human political ideas. It intersects with philosophy, law, history, and political science.

History of religion: The history of religion refers to written records of human religious beliefs. It started with the invention of writing about 5,200 years ago. Before written records, there was the prehistory of religion. A timeline of religion helps study comparative religious chronology. Writing standardized religious texts and made it easier to memorize prayers and rules. The Christian Bible includes oral texts passed down over centuries.

History of Buddhism: Buddhism originated in Ancient India around 5th century BCE, founded by Siddhārtha Gautama. It spread throughout Asia, significantly impacting Central, East, and Southeast regions. The religion's teachings influenced a large part of Asia.

History of Christianity: The history of Christianity is a chronological account of the development and transformation of the Christian religion, spanning from the 1st century to the present day. It encompasses the evolution of beliefs and practices, geographical expansion, and the emergence of diverse global forms.

History of Hinduism: The history of Hinduism includes various religious traditions in India, dating back to prehistoric times. Hinduism is considered the oldest religion, with diverse roots and no singular founder. It emerged as a synthesis of Indian cultures after the Vedic period and flourished during the medieval era. This happened in parallel with the decline of Buddhism in India.

History of Islam: The history of Islam encompasses the growth and influence of the Islamic civilization, covering political, social, economic, military, and cultural aspects. It is believed to have originated in the 7th century CE with Muhammad's mission in Mecca and Medina. Muslims consider Islam a continuation of the faith practiced by previous prophets, including Adam, Noah, Abraham, Moses, David, Solomon, and Jesus, emphasizing submission to God's will.

Jewish history: Jewish history encompasses the journey and impact of the Jews throughout time, tracing their nation, religion, and culture as they developed and intertwined with diverse peoples, religions, and cultures.

History of science: The history of science is the study of scientific progress throughout ancient times to today, covering natural, social, and formal branches of science.

History of astronomy: The study of celestial bodies, known as astronomy, has its roots in ancient religious, mythological, and astrological beliefs. It dates back to prehistoric times and influenced various practices, including astrology. Even during the Copernican Revolution in the 16th century, astronomy remained closely intertwined with astrology in Europe. In certain cultures, astronomical data was utilized for making astrological predictions.

History of biology: The history of biology dates back to ancient times, spanning from Ayurveda and ancient Egyptian medicine to the works of Aristotle, Theophrastus, and Galen. It was further developed by Muslim scholars like Avicenna in the Middle Ages. During the European Renaissance, new organisms were discovered and biological thought was revolutionized through empiricism. Prominent figures like Vesalius, Harvey, Linnaeus, and Buffon played a crucial role in classifying life and studying development and behavior. Antonie van Leeuwenhoek's microscopy revealed microorganisms, laying the groundwork for cell theory. Natural theology also influenced the growth of natural history.

History of chemistry: The history of chemistry encompasses ancient times to the present, showcasing the development of different branches. Ancient civilizations made significant technological advancements including fire, metal extraction, pottery, fermentation, and the extraction of chemicals from plants. They also discovered soap, glass making, and alloys like bronze.

History of linguistics: The History of Linguistics is the study of the scientific analysis of language form, meaning, and context. It involves the examination of language's development and evolution over time.

History of physics: The history of physics starts with the scientific revolution in the 17th century and grew rapidly in the 19th. It has made significant discoveries in the 20th century, which have applications in various natural sciences and technology. Physics can be divided into classical and modern physics.

History of geography: The term 'History of geography' refers to the different histories of geography across time and cultures. Geography has evolved into an independent academic discipline. The word 'geography' comes from the Greek word 'geographia', meaning 'Earth-writing', and was first used by Eratosthenes. However, there were recognizable geography practices like map-making before the term was coined.

History of geology: The history of geology is the development of the science studying Earth's origin, history, and structure.

History of technology: The history of technology is the study of the development of tools and techniques throughout time. It encompasses a wide range of advancements, from simple stone tools to complex genetic engineering and information technology. The term technology originates from Greek words meaning art and craft, initially applied to applied arts but now includes advancements that impact our environment.

History of agriculture: The history of agriculture began in various regions worldwide, leading to a significant shift in human lifestyles. Around 12,000 years ago, the development of agriculture resulted in the transition from nomadic hunter-gatherer societies to settled communities dependent on farming.

Green Revolution: The Green Revolution, or Third Agricultural Revolution, was a period of technology transfer that boosted crop yields. It started in developed countries in the early 20th century and later spread worldwide until the late 1980s. Notably, farmers adopted high-yielding varieties of cereals like dwarf wheat and rice, along with chemical fertilizers, pesticides, and controlled irrigation.

History of communication: The history of communication has progressed alongside political and economic changes, reflecting power dynamics. It encompasses various forms of exchange, from subtle interactions to mass communication. Communication dates back to the origin of speech around 100,000 BCE, with technology playing a role in communication since the use of symbols approximately 30,000 years BCE. Examples include cave paintings, petroglyphs, and ideograms. Writing, printing, and telecommunications have been significant innovations, culminating in the internet.

History of writing: The history of writing explores the evolution of language expression through markings, shaping societies and transforming social organization. Writing systems lay the groundwork for literacy and its associated social and psychological impacts.

History of computing hardware: The history of computing hardware traces the evolution of calculators to modern computers, highlighting significant advancements throughout the years.

History of transport: The history of transport involves technological advancements that have allowed for increased travel distances and exploration. From ancient times, tools like foot coverings, skis, and snowshoes expanded travel possibilities. With new inventions, travel time decreased and the capacity for transporting larger loads increased. Ongoing innovation aims to reduce costs and improve transport efficiency.

History of aviation: The history of aviation spans over two millennia, from early experiments with kites and tower jumping to supersonic and hypersonic flight using powered jets.

History of mathematics: The history of mathematics explores the origins and methods of mathematical discoveries. Prior to widespread knowledge, new developments were only found in a few places. From 3000 BC, Mesopotamian and Egyptian civilizations began using mathematics for practical purposes such as taxation and trade, as well as for understanding patterns in nature, astronomy, and recording time.

History of medicine: The history of medicine includes studying medical practices in past societies, exploring current practices, and is a multidisciplinary field seeking to understand the evolution of medicine throughout history.

History of psychology: The history of psychology is the exploration of the human mind and behavior, dating back to ancient civilizations like Egypt, Persia, Greece, China, and India. It is defined as the scientific study of behavioral and mental processes.

History of sociology: The history of sociology began after the French Revolution, emerging as a science of society influenced by Enlightenment thought. It was shaped by movements in philosophy of science and knowledge, which responded to issues like modernity, capitalism, urbanization, rationalization, secularization, colonization, and imperialism.

History of economic thought: The history of economic thought is the study of the different philosophies and theories in the field of political economy and economics from ancient times to the present. It explores various schools of thought and key thinkers. Aristotle questioned the ownership of property, while Thomas Aquinas emphasized the moral obligation of businesses to sell goods at a fair price.

Legal history: Legal history is the study of how law has evolved and why it has changed. It is closely connected to the development of civilizations and operates within the context of social history. Legal historians record the evolution of laws, explaining how they have changed and seeking to understand the origins of legal concepts. They analyze legal institutions as complex systems that interact with society, shaping and being shaped by it. Through statistical methods and analyzing case outcomes, legal historians gain insights into the practices, procedures, and effects of law on society. This analysis provides a more comprehensive understanding than traditional jurisprudence and case law can offer.

Military history: Military history is the exploration of past armed conflicts and their effects on societies, cultures, economies, and relationships, both local and international.

History of games: The history of games goes back to ancient times and is an important part of all cultures. Games are formalized forms of play that go beyond imagination and physical activity. They feature uncertainty, rules, competition, specific place and time, elements of fiction and chance, goals, and personal enjoyment.

History of sport: The history of sport dates back to 7000 BCE, with early connections to warfare and entertainment.

Prehistory: Prehistory is the period of human history before the invention of writing. It spans from the use of stone tools approximately 3.3 million years ago to the development of writing systems around 5,000 years ago. While symbols and marks were used early on, widespread adoption of writing occurred much later. Prehistory ended at different times in different regions and is less commonly discussed in societies where it ended more recently.

Early human migrations: Early human migrations refer to the initial movements of archaic and modern humans across continents, beginning around 2 million years ago with Homo erectus leaving Africa. Later migrations involved other archaic humans, such as H. heidelbergensis, who likely gave rise to Denisovans, Neanderthals, and modern humans. These early hominids likely crossed now submerged land bridges.

Stone Age: The Stone Age was a prehistoric period lasting around 3.4 million years, in which stone was predominantly used to make tools. It ended between 4,000 BC and 2,000 BC, with the introduction of metalworking, making up almost 99.3% of human history. Although basic metalworking existed during the Stone Age, the melting and smelting of copper marked its end. The Bronze Age followed, characterized by the use of copper alloys in place of stone for tool-making.

Paleolithic: The Paleolithic, also known as the Old Stone Age, was a period in human prehistory characterized by the invention of stone tools. It lasted from around 3.3 million years ago to about 11,650 years ago, marking the majority of human prehistoric technology.

Lower Paleolithic: The Lower Paleolithic refers to the earliest phase of the Paleolithic era, lasting from approximately 3.3 million to 300,000 years ago. It marks the introduction of stone tools by early humans and encompasses the Oldowan and Acheulean lithic industries.

Middle Paleolithic: The Middle Paleolithic is the second period of the Stone Age, spanning from around 300,000 to 30,000 years ago. It is known as the Middle Stone Age in African archeology. Dating varies across regions, but in Great Britain, it is estimated to have occurred from 325,000 to 35,000 years ago. It was followed by the Upper Paleolithic period. The Middle Paleolithic took place during the Chibanian and Late Pleistocene ages.

Control of fire by early humans: The early humans' control of fire was a crucial technological advancement that brought numerous benefits. Fire offered warmth, lighting, and defense against predators. It also facilitated the development of advanced hunting tools and the cooking of food. These cultural advancements led to human geographic dispersion, cultural innovations, and changes in diet and behavior. Moreover, fire enabled human activity to extend into the evening hours.

Upper Paleolithic: The Upper Paleolithic is the final phase of the Paleolithic period. It spans between 50,000 and 12,000 years ago, marking the emergence of early modern humans with advanced behaviors. This period ends with the onset of the Neolithic Revolution and the introduction of agriculture.

Behavioral modernity: Behavioral modernity refers to the distinct cognitive and behavioral traits that separate Homo sapiens from other human species and primates. This includes abstract thinking, planning, symbolic behavior, music and dance, hunting large game, and advanced tool use. These traits are supported by cognitive and cultural foundations, such as cumulative cultural adaptation, social norms, language, and widespread cooperation among humans.

Mesolithic: The Mesolithic, also known as the Middle Stone Age, is an archaeological period that bridges the gap between the Upper Paleolithic and the Neolithic. It marks the final stage of hunter-gatherer cultures in Europe and the Middle East. The Mesolithic has different time spans in different parts of Eurasia, typically covering 15,000 to 5,000 BP in Europe and 20,000 to 10,000 BP in the Middle East. It is sometimes referred to as Epipaleolithic outside of northern Europe and in regions like the Levant and Caucasus. The term is not widely used beyond Eurasia and North Africa.

Neolithic: The Neolithic, or New Stone Age, was a significant archaeological period marking the end of the Stone Age in Europe, Asia, and Africa. It brought about the Neolithic Revolution, which led to the adoption of farming, domestication of animals, and the transition from a hunter-gatherer lifestyle to settled communities. The term 'Neolithic' was coined in 1865 by Sir John Lubbock as part of the three-age system.

Neolithic Revolution: The Neolithic Revolution, or First Agricultural Revolution, was a significant transition in human cultures during the Neolithic period. It involved a shift from hunting and gathering to agriculture and settlement, leading to the rise of larger populations. The development of settled communities allowed humans to study plants and led to the domestication of crops.

Cradle of civilization: A cradle of civilization refers to a place where civilization emerged independently from other locations. Key features include the development of urban settlements, sedentary populations, monumental architecture, social classes, writing systems, and a gradual transition from simpler societies to complex civilizations.

Proto-Indo-Europeans: The Proto-Indo-Europeans were a hypothetical prehistoric group in Eurasia who spoke the reconstructed common ancestor of Indo-European languages, known as Proto-Indo-European.

Prehistoric Egypt: Prehistoric Egypt refers to the time from earliest human settlement to the start of the Early Dynastic Period (around 3100 BC). It marks the reigns of Pharaohs Narmer or Hor-Aha, with Menes possibly also being mentioned as one of these rulers.

Ancient history: Ancient history is the time period spanning from the start of recorded human history to the late antiquity, around 5,000 years. It encompasses all continents and is divided into the Stone Age, Bronze Age, and Iron Age based on the three-age system. Recorded history is believed to have begun during the Bronze Age, but the start and end of these ages differ across regions.

Bronze Age: The Bronze Age, from 3300 BC to 1200 BC, marked the use of bronze and early urban civilization. It is the second phase of the Metal Ages and part of the three-age system proposed by Christian Jürgensen Thomsen.

Chalcolithic: The Chalcolithic period was characterized by the use of smelted copper, bridging the gap between the Neolithic and Bronze Ages. It occurred at various times across different regions but was absent in Russia. Stone tools remained prevalent during this period.

Iron Age: The Iron Age is the last era of the three Metal Ages. It follows the Copper and Bronze Ages and is considered the final stage of the three-age division that starts with prehistory. Initially describing Iron Age Europe and the Ancient Near East, the concept now includes other regions of the Old World.

Classical antiquity: Classical antiquity refers to the period between the 8th century BC and the 5th century AD, also known as the classical era. It was a time when ancient Greece and Rome thrived, exerting significant influence across Europe, North Africa, and West Asia. These civilizations, collectively known as the Greco-Roman World, were centered around the Mediterranean Basin.

Hellenistic period: The Hellenistic period refers to the time in Mediterranean history after Classical Greece (323 BC-31 BC), marked by the death of Alexander the Great and the emergence of the Roman Empire. It encompasses all ancient territories influenced by Greece, particularly the East after Alexander's conquests. The term "Hellenistic" evolved from the Greek word Hellas, which gradually became recognized as the name for Greece. The Hellenistic period is distinct from the "Hellenic" period, which refers specifically to Greece itself.

Late antiquity: Late antiquity refers to the period between the end of classical antiquity and the Middle Ages, lasting from the late 3rd century to the 7th or 8th century in Europe and surrounding Mediterranean areas. Historians disagree on the exact timeframe, with some proposing 150-750 AD and others suggesting 250 AD to around 700 AD. This era marked the universal end of ancient history across civilizations. The precise boundaries are a subject of ongoing debate, but in the West, the Early Middle Ages typically began in the 6th century or earlier within the Western Roman Empire.

Silk Road: The Silk Road was an ancient network of trade routes spanning over 6,400 kilometers. It operated from the second century BCE to the mid-15th century, connecting the East and West. The Silk Road facilitated economic, cultural, political, and religious exchanges. Some historians now prefer the term Silk Routes to highlight the intricate web of overland and maritime connections across Asia, East Africa, and Southern Europe.

Ancient Greece: Ancient Greece was a civilization in northeastern Mediterranean, lasting from the 12th–9th centuries BC to classical antiquity. It consisted of city-states and territories, briefly united under Alexander the Great. After this, it transitioned into the Early Middle Ages and the Byzantine period.

Classical Athens: Classical Athens, located in Attica, Greece, was a prominent city-state in ancient Greece. It led the Delian League against Sparta in the Peloponnesian War and established Athenian democracy in 508 BC. This democratic system lasted for 180 years, reaching its peak during the Age of Pericles in the 440s to 430s BC.

Delian League: The Delian League was formed in 478 BC and was led by Athens. It was an alliance of Greek city-states, with approximately 150 to 330 members. Its main objective was to sustain the fight against the Persian Empire following the Greek triumph in the Battle of Plataea, which marked the end of the Second Persian invasion of Greece.

Greco-Persian Wars: The Greco-Persian Wars were conflicts between the Achaemenid Empire and Greek city-states from 499 BC to 449 BC. Cyrus the Great's conquest of Ionia in 547 BC triggered the clashes. The Persians appointed tyrants to govern the autonomous Greek cities, leading to ongoing trouble for both sides.

Mycenaean Greece: Mycenaean Greece, spanning 1750-1050 BC, was an advanced Bronze Age civilization in mainland Greece. Influenced by Minoan Crete, its distinctively Greek culture included palaces, urban organization, art, and writing. Mycenae, along with sites like Pylos and Athens, were prominent centers of power. Mycenaean settlements extended to Epirus, Macedonia, Aegean islands, Asia Minor, Cyprus, and even influenced the Levant and Italy.

Peloponnesian War: The Peloponnesian War was an ancient conflict between Athens and Sparta for control over Greece. It lasted for a long time and ended with the Persian Empire siding with Sparta, leading to Athens' defeat. Sparta's victory established their dominance over Greece.

Ancient Rome: Ancient Rome refers to the period of Roman civilization from its founding in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD. It encompasses the establishment of Rome, the development of the Roman Kingdom, Republic, and Empire.

Roman Kingdom: The Roman Kingdom, or monarchy, was the earliest period in Rome's history when the city and its territory were governed by kings. It started around 753 BC and ended in 509 BC with the establishment of the Roman Republic.

Roman Republic: The Roman Republic was a period of classical Roman civilization from the fall of the Roman Kingdom to the rise of the Roman Empire in 27 BC. It marked Rome's expansion from a city-state to dominating the Mediterranean region.

Gallic Wars: The Gallic Wars were fought between Julius Caesar and various tribes in Gaul from 58 to 50 BC. The Romans emerged victorious after the Battle of Alesia, expanding their control over Gaul. Internal divisions among the Gallic tribes aided Caesar's success. Caesar's stated reasons for the invasion were defensive, but historians believe his primary motives were political and financial. Conquering Gaul allowed Rome to establish a secure border along the Rhine River and protect against attacks from Gallic and Germanic tribes.

Macedonian Wars: The Macedonian Wars were a series of conflicts between the Roman Republic and Greek kingdoms. They resulted in Roman control over Greece and the eastern Mediterranean. The wars included four against Macedonia, one against the Seleucid Empire, and a minor war with the Achaean League. The war with the Seleucid Empire was the most significant and marked the end of both empires' power. The wars against Macedonia gradually dissolved its independence and digested it into the Roman Empire. The outcome of the war with the Seleucid Empire was fatal to it.

Roman Empire: The Roman Empire was the ancient state of Rome, ruled by emperors after Octavian's assumption of sole rule in 31 BC. It covered Europe, North Africa, and Western Asia. The fall of the Western Roman Empire in 476 marked the end of classical antiquity and the start of the Middle Ages.

Crisis of the Third Century: The Crisis of the Third Century (235-284) was a time of near collapse for the Roman Empire. This period, also known as the Military Anarchy or the Imperial Crisis, was characterized by internal unrest and military instability. It was ultimately resolved by the military successes of Aurelian and the reforms implemented by Diocletian in 284.

Julio-Claudian dynasty: The Julio-Claudian dynasty refers to the first five Roman emperors - Augustus, Tiberius, Caligula, Claudius, and Nero.

Nerva–Antonine dynasty: The Nerva-Antonine dynasty was a succession of seven Roman emperors who reigned from 96 to 192 AD. The emperors were Nerva, Trajan, Hadrian, Antoninus Pius, Marcus Aurelius, Lucius Verus, and Commodus. The first five of these rulers are often referred to as the "Five Good Emperors."

Western Roman Empire: The Western Roman Empire refers to the western provinces of the Roman Empire during the period when they were governed separately from the eastern provinces. From 395 to 476 AD, there were distinct imperial courts governing the Western and Eastern provinces. Although the Romans saw it as one united entity, modern terms like Western Roman Empire emerged to describe the de facto independent political entities. The Western Empire ultimately collapsed by 476 AD, and the Western imperial court vanished by 554 AD after the Gothic War.

Fall of the Western Roman Empire: The fall of the Western Roman Empire refers to the loss of political control in the western region, resulting in the division of the territory among successor states. Factors contributing to the fall include weakened military, declining population, economic troubles, weak leadership, internal power struggles, religious changes, and invasions by barbarian groups. Environmental changes and diseases also had an impact. The collapse of the Roman Empire is a significant topic in ancient history and its causes remain relevant in discussions about state failures today.

Minoan civilization: The Minoan civilization, based in Crete, was a thriving Bronze Age culture known for its impressive architecture and vibrant art. Considered Europe's first civilization, it left a significant impact on the region.

Dacians: The Dacians were an ancient Indo-European group living in the region of Dacia, near the Carpathian Mountains and west of the Black Sea. They are connected to the Thracians and their territory includes present-day Romania, Moldova, parts of Ukraine, Serbia, Bulgaria, Slovakia, Hungary, and Poland. The Dacians spoke their own language, which is debated to be related to Thracian. Their culture was influenced by the Scythians and Celtic invaders in the 4th century BC.

Etruscan civilization: The Etruscan civilization, developed by the Etruscans in ancient Italy, was a federation of city-states with a shared language and culture. Their territory encompassed present-day Tuscany, western Umbria, northern Lazio, the Po Valley, Emilia-Romagna, south-eastern Lombardy, southern Veneto, and western Campania.

Macedonia (ancient kingdom): Macedonia (ancient kingdom) was founded by the Argead dynasty and later became the dominant state in Hellenistic Greece. It was located on the northeastern part of the Greek peninsula, bordered by Epirus, Illyria, Paeonia, Thrace, and Thessaly.

Celts: The Celts were a group of Indo-European peoples in Europe and Anatolia, known for their use of Celtic languages and shared cultural traits. They included the Gauls, Celtiberians, Gallaeci, Britons, Gaels, Boii, and Galatians. The relationship between ethnicity, language, and culture among the Celts is debated. In current scholarship, 'Celt' primarily refers to speakers of Celtic languages rather than a single ethnic group.

Saxons: The Saxons were a Germanic people who lived in a large coastal region in northern Germania, now Germany. They were initially known as coastal raiders during the late Roman Empire and later became associated with the Vikings. Their origins are unclear, but they were believed to have settled near the German North Sea coast. The Saxons were in conflict with the Franks and Thuringians and had settlements in what would later become Normandy. Their earliest settlement area was likely Northern Albingia, which is close to the possible homeland of the Angles.

Sarmatians: The Sarmatians were a powerful group of nomadic peoples who controlled the Pontic steppe from the 3rd century BC to the 4th century AD. They were equestrian warriors of Eastern Iranian origin, known for their dominance in classical antiquity.

Scythians: The Scythians, also known as Scyths or Pontic Scythians, were ancient nomadic people. They migrated from Central Asia to modern-day Ukraine and Southern Russia during the 9th to 8th centuries BC. They were equestrian warriors and established their presence in the region from the 7th to the 3rd century BC.

Migration Period: The Migration Period, or Barbarian Invasions, was a significant period in European history when the Western Roman Empire fell and various tribes migrated and settled in its former territories, forming post-Roman kingdoms.

Alans: The Alans were an ancient nomadic people from the North Caucasus region, belonging to the Sarmatians. They may have been related to the Massagetae and the Yancai of Central Asia. The Alans migrated westwards and became dominant among the Sarmatians on the Pontic-Caspian steppe. They settled north of the Black Sea and frequently raided the Parthian and Roman provinces. The Goths weakened their power on the Pontic Steppe from 215 to 250 CE.

Huns: The Huns were nomadic people from Central Asia, living between the 4th and 6th century AD. They initially resided east of the Volga River. The Huns migrated westward alongside the Alans, an Iranian people. They reached the Volga River by 370 AD and eventually established a temporary dominion in Europe by 430 AD. During this period, they conquered the Goths and various Germanic tribes outside of Roman borders, causing many to seek refuge within Roman territory.

Goths: The Goths were Germanic people who had a significant impact on the fall of the Western Roman Empire and the rise of medieval Europe.

Vandals: The Vandals were a Germanic people who lived in southern Poland. In the 5th century, they formed kingdoms in areas including the Iberian Peninsula, Mediterranean islands, and North Africa.

Fertile Crescent: The Fertile Crescent refers to a region in the Middle East that has a crescent-like shape. It includes modern-day Iraq, Israel, Jordan, Lebanon, Palestine, and Syria, along with parts of Kuwait, Turkey, and Iran. Some sources also include Cyprus and northern Egypt in this region.

Mesopotamia: Mesopotamia, also known as present-day Iraq, is a historical region in West Asia. It was located within the Tigris-Euphrates river system, in the northern part of the Fertile Crescent. Besides Iraq, it also encompassed parts of Iran, Kuwait, Syria, and Turkey.

Sumer: Sumer is an ancient civilization that emerged in southern Mesopotamia around 6,000 years ago. It is considered one of the cradles of civilization along with Egypt, the Indus Valley, and Mesoamerica. Sumerians were skilled farmers who lived along the Tigris and Euphrates rivers, growing abundant crops that allowed them to form urban settlements. They were also pioneers in writing, with the world's earliest known texts originating from Sumerian cities around 5,000 years ago.

Akkadian Empire: The Akkadian Empire was the first ancient empire in Mesopotamia, succeeding Sumer. It united Akkadian and Sumerian speakers under one rule. The empire was centered around Akkad and influenced regions across Mesopotamia, the Levant, and Anatolia. It conducted military expeditions as far as the Arabian Peninsula.

Amorites: The Amorites were a Bronze Age people from the Levant who spoke Northwest Semitic languages. They emerged around 2500 BC and eventually dominated territories including the Levant, Mesopotamia, and parts of Egypt. Their rule lasted from the 21st century BC to the late 17th century BC.

Kingdom of Armenia (antiquity): The Kingdom of Armenia, also known as Greater Armenia or Armenian Empire, was an ancient kingdom in the Near East from 331 BC to 428 AD. It was ruled by three royal dynasties: Orontid, Artaxiad, and Arsacid.

Assyria: Assyria, an influential Mesopotamian civilization, thrived as a city-state from the 21st century BC, evolving into a territorial state and eventually an empire until the 7th century BC.

Babylonia: Babylonia was an ancient state in central-southern Mesopotamia, centered around the city of Babylon. It emerged as an Akkadian speaking state in 1894 BC. Babylonia was known as "the country of Akkad" due to its connection to the previous Akkadian Empire. It often rivalled Assyria in the north and Elam in Ancient Iran. Under Hammurabi, it briefly became a major power in the region, succeeding other empires. However, it fell apart after his death, reverting to a small kingdom centered on Babylon.

Chaldea: Chaldea was a small country in Mesopotamia that existed from the late 10th or early 9th century BC to the mid-6th century BC. It was Semitic-speaking and located in the marshy southeastern corner of Mesopotamia. Chaldea briefly ruled Babylon and its people were eventually assimilated into the native population. The Hebrew Bible refers to them as כשדים (Kaśdim), translated as Chaldaeans, though it is debated whether this term truly means Chaldean or relates to the Kaldu of south Mesopotamia.

Ebla: Ebla was an early kingdom in Syria, located near Aleppo. It was a significant center in the 3rd and 2nd millennia BC, challenging the idea that Egypt and Mesopotamia were the only dominant civilizations in the Near East during the Bronze Age. Ebla's discovery showcased the region as a key ancient civilization, and the first Eblaite kingdom is considered the world's first recorded world power.

History of ancient Israel and Judah: The history of ancient Israel and Judah begins in Southern Levant, Western Asia in the Late Bronze Age. The earliest reference to "Israel" is found in an inscription from ancient Egypt, around 1208 BCE. Ancient Israelites are believed to have developed from the Canaanite civilization. Two Israelite polities, the Kingdom of Israel and the Kingdom of Judah, emerged during the Iron Age II.

Hittites: The Hittites were an ancient Anatolian Indo-European civilization in Bronze Age West Asia. They settled in modern-day Turkey in the early 2nd millennium BC, forming an empire centered on Hattusa. Known as the Hittite Empire, they reached their peak around the mid-14th century BC under Šuppiluliuma I, ruling over much of Anatolia, northern Levant, and upper Mesopotamia.

Mitanni: Mitanni was an ancient state that existed from roughly 1550 to 1260 BC. It was known by different names in various texts, such as Ḫabigalbat and Hanigalbat. Mitanni was located in northern Syria and southeast Anatolia. It was a Hurrian-speaking state with Indo-Aryan linguistic influences. Limited information is available about Mitanni since no historical records have been discovered in its excavated sites. Our understanding of this state is primarily based on comments made by neighboring powers in their texts.

Lydia: Lydia was an Iron Age kingdom in western Asia Minor. It was situated east of ancient Ionia in modern-day western Turkey. The Lydians were the ethnic group living in Lydia and their language, Lydian, belonged to the Anatolian branch of the Indo-European language family. The capital city of Lydia was Sardis.

Odrysian kingdom: The Odrysian kingdom was an ancient Thracian state that existed from the 5th century BC to the 1st century BC. It encompassed modern-day Bulgaria, southeastern Romania, northern Greece, and European Turkey. The Odrysians, the dominant tribe, established the first significant political entity in the eastern Balkans. Initially, the kingdom had no fixed capital until the late 4th century when Seuthopolis was founded.

Phoenicia: Phoenicia was an ancient Semitic civilization centered in modern Lebanon. Their territory extended from modern Syria to Israel, covering the entire coast of Lebanon. They were known for their thalassocratic culture and had significant influence through trade and colonization across the Mediterranean, from Cyprus to the Iberian Peninsula.

Phrygia: Phrygia, an ancient kingdom in Anatolia (now Asian Turkey), controlled the region around the Sangarios River. It later became a part of powerful empires during the classical antiquity.

Seleucid Empire: The Seleucid Empire was a Greek power in West Asia from 312 BC to 63 BC, established by Seleucus I Nicator, a Macedonian general after the division of Alexander the Great's empire. It lasted for nearly 250 years until being annexed by the Roman Republic under Pompey.

Sabaeans: The Sabaeans were a group of ancient South Arabians who spoke Sabaic. They established the kingdom of Sabaʾ in modern-day Yemen, believed to be the biblical land of Sheba. This kingdom was considered the oldest and most significant among the South Arabian kingdoms.

Trojan War: The Trojan War was a legendary conflict in Greek mythology around the 12th or 13th century BCE. It was fought by the Greeks against Troy due to Paris taking Helen from Menelaus of Sparta. The war is a crucial event in Greek mythology, recounted in various Greek literature, such as Homer's Iliad and Odyssey. The war lasted ten years, with the Iliad describing a four-day period while the Odyssey follows the journey of Odysseus back home. Other poems and writings explore different aspects of the war. Its tales influenced Greek tragedy and Roman poets like Virgil and Ovid.

Urartu: Urartu was an Iron Age kingdom in the Armenian Highlands, centered around Lake Van. It controlled the Armenian Highlands from the 9th to the 6th century BC, becoming a dominant power in the Near East. It frequently clashed with Assyria and left behind impressive fortresses and metalwork. The kingdom fell to the Medes in the 6th century BC. Urartu's inscriptions in the Urartian language and its role in Armenian nationalism make it significant.

Achaemenid Empire: The Achaemenid Empire, also called the First Persian Empire, was an ancient Iranian empire founded by Cyrus the Great in 550 BC. It was the largest empire of its time, covering 5.5 million square kilometers. The empire stretched from the Balkans and Egypt in the west to Central and South Asia in the east.

Atropatene: Atropatene, or Media Atropatene, was an ancient Iranian kingdom founded in 323 BC by the Persian satrap Atropates. Located in present-day northern Iran, it remained under the rule of Atropates' descendants until the early 1st century AD when the Parthian Arsacid dynasty took over. The region was conquered by the Sasanians in 226 and became a province governed by a marzban. Notably, Atropatene was the only Iranian territory to maintain uninterrupted Zoroastrian authority from the Achaemenid era to the Arab conquest, despite a brief period of Macedonian rule under Alexander the Great.

Bactria: Bactria was an ancient Iranian civilization in Central Asia, located in modern-day Afghanistan. It thrived in an area south of the Oxus River, protected by mountains on three sides: the Pamir to the north, the Hindu Kush to the south, and the Karakoram ranges to the east.

Caucasian Albania: Caucasian Albania refers to a former state in the Caucasus, now mainly part of Azerbaijan. The local Udi people identify themselves as descendants of the inhabitants. The original name of this state remains unknown.

Kingdom of Iberia: The Kingdom of Iberia was a significant monarchy in the Caucasus during Classical Antiquity and the Early Middle Ages. It was known as Kartli in the Georgian kingdom and was either an independent state or under the control of larger empires like the Sassanid and Roman empires. Iberia was located in present-day Eastern Georgia and bordered Colchis in the west, Caucasian Albania in the east, and Armenia in the south.

Elam: Elam was an ancient civilization in modern-day Iran and southern Iraq. It was a prominent political force in the Ancient Near East. The name Elam comes from the Sumerian transliteration elam(a) and the Elamite haltamti. Its capital was Susa, and it was also known as Susiana in classical literature.

Medes: The Medes were an ancient Iranian people who lived in an area called Media. They occupied parts of northwestern Iran and regions of Mesopotamia around 11th century BC. Their dominance in Iran happened in the 8th century BC. During the 7th century BC, they ruled over western Iran, but the exact extent of their territory is unclear.

Parthian Empire: The Parthian Empire, or Arsacid Empire, was a major political and cultural power in ancient Iran (247 BC - 224 AD). It was founded by Arsaces I, who conquered Parthia from the Seleucid Empire. Mithridates I expanded the empire by seizing Media and Mesopotamia. At its peak, it spanned from Turkey to Afghanistan and Pakistan. The empire thrived as a trade hub on the Silk Road, connecting the Roman Empire and the Han dynasty of China.

Roman–Persian Wars: The Roman-Persian Wars were a series of conflicts between the Greco-Roman world and the Parthian and Sasanian empires of Iran. Starting in 54 BC, these wars involved vassal kingdoms and nomadic allies. The conflicts spanned the Roman Republic, Roman Empire, and Sasanian Empire. Ultimately, the wars ended with the rise of the Muslim conquests, leading to the downfall of the Sasanian Empire and significant territorial losses for the Byzantine Empire.

Sasanian Empire: The Sasanian Empire, also known as the Second Persian Empire, was the last Iranian empire before it was conquered by Muslim forces in the 7th–8th centuries AD. It existed from 224 to 651 AD and was the second longest-lived Persian imperial dynasty. The empire succeeded the Parthian Empire and re-established Persia as a major power alongside the Roman Empire. It ultimately fell to the Arab conquest of Iran.

Sogdia: Sogdia, an ancient East Iranian civilization, existed between the Amu Darya and the Syr Darya rivers, encompassing present-day Uzbekistan, Turkmenistan, Tajikistan, Kazakhstan, and Kyrgyzstan. It was initially a province of the Achaemenid Empire and later conquered by Alexander the Great in 328 BC. Sogdia saw various rulers throughout its history, including the Seleucid Empire, Greco-Bactrian Kingdom, Kushan Empire, Sasanian Empire, Hephthalite Empire, Western Turkic Khaganate, and ultimately fell to the Muslim conquest of Transoxiana.

Tocharians: The Tocharians were speakers of Indo-European Tocharian languages. They left behind about 7,600 documents from 400 to 1200 AD in the Tarim Basin. Although they were mistakenly identified with the Tókharoi of ancient Greek sources, Tocharian remains the common term for their languages. Their actual ethnic name is unknown, but they may have referred to themselves as Agni, Kuči, and Krorän.

Gupta Empire: The Gupta Empire was an ancient Indian empire that existed from the 4th to 6th century CE. It covered a significant portion of the Indian subcontinent from 319 to 467 CE. Consideredby some as the Golden Age of India, it had notable rulers like Chandragupta I, Samudragupta, Chandragupta II, and Skandagupta. The Guptas conquered several kingdoms, including those outside India, such as the Parasikas, Hunas, Kambojas, Kinnaras, and Kiratas.

Indus Valley Civilisation: The Indus Valley Civilization (IVC) was a Bronze Age civilization in South Asia from around 3300 BCE to 1300 BCE. It was one of the earliest civilizations in the Near East and South Asia, alongside ancient Egypt and Mesopotamia. The IVC was the most widespread of these civilizations, with sites spanning from Pakistan to Afghanistan and India. It flourished in the alluvial plain of the Indus River and along monsoon-fed rivers in northwest India and eastern Pakistan.

Chola dynasty: The Chola dynasty was a Tamil dynasty from southern India that ruled over the Chola Empire, a vast maritime empire. It traces its origins back to the 3rd century BCE and achieved imperialism under the Medieval Cholas in the mid-9th century CE. As one of the Three Crowned Kings of Tamilakam, it governed territories until the 13th century CE.

Indo-Greek Kingdom: The Indo-Greek Kingdom, also known as the Yavana Kingdom, was a Greek kingdom that existed from c. 200 BC to c. 10 AD. It covered regions in present-day Afghanistan, Pakistan, and northwestern India. It belonged to the Hellenistic era and marked the influence of Greek culture in the region during that time.

Indo-Scythians: The Indo-Scythians were nomadic Iranian people of Scythian origin who migrated from Central Asia to the northwestern Indian subcontinent (modern-day Afghanistan, Pakistan, and northern India) between the 2nd century BCE and 4th century CE.

Kushan Empire: The Kushan Empire was a syncretic dynasty established by the Yuezhi in the Bactrian territories in the early 1st century. It expanded to cover present-day Uzbekistan, Afghanistan, Pakistan, and Northern India. The empire's reach extended up to Saketa and Sarnath near Varanasi, where inscriptions from the time of the Kushan emperor Kanishka the Great have been discovered.

Magadha: Magadha, also known as the Kingdom of Magadha or the Magadha Empire, was a powerful ancient kingdom in southern Bihar, India. It was one of the sixteen Mahajanapadas and played a significant role in the Second Urbanization period. Ruled by various dynasties including the Mauryas, Magadha expanded to become a pan-Indian empire, encompassing parts of Afghanistan and the Indian subcontinent. However, it eventually lost much of its territories and became a small principality centered around Pataliputra after a defeat by the Satavahanas in 28 BC.

Maurya Empire: The Maurya Empire was a powerful Iron Age kingdom in South Asia, founded by Chandragupta Maurya in 322 BCE. It was centered in Magadha with its capital at Pataliputra. The empire's control extended over the Indo-Gangetic Plain, but it relied on the loyalty of military commanders for its territorial reach. Under Ashoka's rule, the empire briefly held control over major cities and trade routes in the Indian subcontinent. However, it declined after Ashoka's reign and eventually dissolved in 185 BCE with the assassination of Brihadratha and the rise of the Shunga dynasty in Magadha.

Satavahana dynasty: The Satavahana dynasty was an ancient Indian ruling family based in the Deccan region. They began ruling in the late 2nd century BCE and lasted until the early 3rd century CE. Their kingdom covered present-day Andhra Pradesh, Telangana, Maharashtra, and parts of Gujarat, Madhya Pradesh, and Karnataka. The capital cities changed over time and included Pratishthana and Amaravati.

Vedic period: The Vedic period in India was a time when the Vedas, important religious texts, were written. It occurred between the decline of the Indus Valley Civilization and the rise of a new urbanization around 600 BCE. The Vedas provide insights into the historical and cultural developments of this period, particularly in the Kuru Kingdom, where the influential Brahmanical ideology emerged. Combining archaeological evidence with the Vedas allows us to understand the evolution of Indo-Aryan and Vedic culture.

Xia dynasty: The Xia dynasty is the first legendary dynasty in Chinese history, established by Yu the Great. It succeeded the Five Emperors and was later followed by the Shang dynasty.

Shang dynasty: The Shang dynasty, also called the Yin dynasty, was an ancient Chinese royal dynasty ruling in the Yellow River valley during the 2nd millennium BC. It succeeded the Xia dynasty and preceded the Western Zhou dynasty. Key historical accounts come from texts like the Book of Documents, Bamboo Annals, and Records of the Grand Historian. Modern scholars generally agree that the dynasty lasted from the 16th to the 11th centuries BC, with more certainty about its end date.

Mandate of Heaven: The Mandate of Heaven is a Chinese political ideology used in ancient and imperial China to legitimize the rule of the King or Emperor. It states that heaven grants the mandate to a virtuous ruler, known as the Son of Heaven, who holds supreme authority over Tianxia. If a ruler is overthrown, it signifies their loss of the mandate, often due to perceived unworthiness or displeasure from heaven expressed through natural disasters.

Zhou dynasty: The Zhou dynasty was a royal dynasty in China that lasted for 789 years, making it the longest in Chinese history. The royal house, known as Ji, held military control from 1046 until 771 BC during the Western Zhou period, and their political influence remained for another 500 years into the Eastern Zhou period. The establishment date is disputed, with some sources supporting 1046 BC and others favoring 1045 BC.

Spring and Autumn period: The Spring and Autumn period (770-481 BCE) in Chinese history, also known as Chunqiu, saw declining royal control and increasing political autonomy among regional lords. It was marked by conflicts, alliances, and the erosion of central authority. The end of the period is associated with the Partition of Jin, signaling the start of the Warring States period.

Warring States period: The Warring States period was a time in ancient China known for intense warfare, as well as reforms and consolidation. It succeeded the Spring and Autumn period and ended with the Qin state's victory in 221 BC, resulting in the first unified Chinese empire under the Qin dynasty.

Qin dynasty: The Qin dynasty was the first Imperial Chinese dynasty, originating from the state of Qin. It lasted from 221 BC to 206 BC and was established after the conquest of rival states. The Qin dynasty was led by Ying Zheng, who declared himself the first emperor, known as Shi Huangdi.

Han dynasty: The Han dynasty was an important imperial dynasty in China, established by Liu Bang. It followed the short-lived Qin dynasty and a period of conflict called the Chu-Han contention, and it was succeeded by the Three Kingdoms period. The dynasty was interrupted by the Xin dynasty, but is generally divided into the Western Han and Eastern Han periods. Spanning over four centuries, the Han dynasty is considered a golden age in Chinese history and has had a lasting impact on Chinese civilization. The Han people, the majority ethnic group in modern China, identify themselves as Han Chinese. The spoken language and written characters are known respectively as the Han language and Han characters.

Xiongnu: The Xiongnu were a nomadic tribal confederation in the Eurasian Steppe from the 3rd century BC to the late 1st century AD. Modu Chanyu led them and established the Xiongnu Empire.

Three Kingdoms: The Three Kingdoms era (220-280 AD) was a period in China characterized by the division of the country into three dynastic states: Cao Wei, Shu Han, and Eastern Wu. It followed the Eastern Han dynasty and was succeeded by the Western Jin dynasty. Additionally, the short-lived state of Yan on the Liaodong Peninsula is sometimes considered as a "4th kingdom."

Jin dynasty (266–420): The Jin dynasty of China (266–420) was founded by Sima Yan and lasted for 154 years. It emerged after the Three Kingdoms period and was followed by the Sixteen Kingdoms in the north and the Liu Song dynasty in the south. Sima Yan, son of Sima Zhao, established the dynasty and was previously known as the King of Jin.

Sixteen Kingdoms: The Sixteen Kingdoms, also known as the Sixteen States, was a chaotic period in Chinese history from AD 304 to 439. It was a time when northern China divided into short-lived dynastic states, founded by both non-Han and Han people. These states fought among themselves and against the Eastern Jin dynasty. The period ended with the unification of northern China in 439 by the Xianbei Tuoba clan's Northern Wei dynasty. This marked the beginning of the Northern and Southern dynasties era.

Northern and Southern dynasties: The Northern and Southern Dynasties were a period of political division in China from 420 to 589 AD. It followed the Sixteen Kingdoms and Eastern Jin dynasty, and is part of the longer Six Dynasties era (220–589). Despite civil war, this time saw thriving arts, technological advancements, and the spread of Mahayana Buddhism and Daoism. Many Han people migrated south of the Yangtze River. The period ended when Emperor Wen of the Sui dynasty unified China proper.

Gojoseon: Gojoseon, also known as Joseon, was the first kingdom in Korea, established by the legendary king Dangun. It had an advanced culture and played a crucial role in the development of later centralized states. The term "Go" was added to distinguish it from the Joseon dynasty founded in 1392 CE.

Three Kingdoms of Korea: The Three Kingdoms of Korea, also known as Samhan, were ancient states that vied for dominance over the Korean Peninsula. Eventually, only three kingdoms remained on the peninsula: Goguryeo, Baekje, and Silla. These kingdoms played a crucial role in shaping Korea's identity, and their peoples became the Korean people.

Jōmon period: The Jōmon period in Japanese history (c. 14,000 - 300 BC) was a time of cultural complexity and sedentism. It was characterized by a diverse population practicing hunting, gathering, and early agriculture. The term "Jōmon" comes from the pottery style found during this period, where wet clay was decorated with impressed cords. This pottery is considered to be among the oldest in the world.

Yayoi period: The Yayoi period in Japan marked the transition from Neolithic to Iron Age, spanning from late Neolithic to Bronze Age.

Hồng Bàng dynasty: The Hồng Bàng dynasty refers to a legendary ancient period in Vietnamese history known as the Hồng Bàng period. It started in 2879 BC with Kinh Dương Vương ruling over the kingdom of Văn Lang and lasted until the state was conquered by An Dương Vương in 258 BC.

Nanyue: Nanyue, an ancient Chinese kingdom, was founded by General Zhao Tuo and ruled by his family until 111 BC. It encompassed Guangdong, Guangxi, Hainan, Hong Kong, Macau, southern Fujian, and parts of northern Vietnam. Established in 204 BC after the fall of the Qin dynasty, Nanyue initially comprised the Nanhai, Guilin, and Xiang commanderies.

Pyu city-states: The Pyu city-states were a group of ancient city-states in present-day Upper Myanmar. Founded by the Pyu people, they existed from the 2nd century BCE to the mid-11th century. This thousand-year period, known as the Pyu millennium, marked the transition from the Bronze Age to the emergence of the Pagan Kingdom in the late 9th century.

Ancient Egypt: Ancient Egypt was a civilization in Northeast Africa, centered around the Nile River and now modern-day Egypt. It emerged around 3100 BC with the unification of Upper and Lower Egypt. The history of Ancient Egypt was marked by stable kingdoms and intermittent periods of instability called Intermediate Periods. Key periods include the Old Kingdom, Middle Kingdom, and New Kingdom.

Old Kingdom of Egypt: The Old Kingdom of Egypt, from around 2700-2200 BC, was an era known as the "Age of the Pyramids" or the "Age of the Pyramid Builders". It was characterized by the reigns of pyramid-builders like King Sneferu and the construction of the pyramids at Giza by the kings Khufu, Khafre, and Menkaure. This period marked Egypt's first sustained peak of civilization and was the first of three significant "Kingdom" periods in the lower Nile Valley.

Middle Kingdom of Egypt: The Middle Kingdom of Egypt was a period of ancient Egyptian history that followed a time of political division known as the First Intermediate Period. It lasted from around 2040 to 1782 BC and saw the reunification of Egypt under the rule of Mentuhotep II. The Eleventh Dynasty ruled from Thebes, while the Twelfth Dynasty ruled from el-Lisht.

New Kingdom of Egypt: The New Kingdom of Egypt, or the Egyptian Empire, was a powerful nation from the 16th to the 11th century BC. It included the Eighteenth, Nineteenth, and Twentieth Dynasties. Radiocarbon dating places its establishment between 1570 BC and 1544 BC. The New Kingdom followed a turbulent period and was succeeded by another challenging era. It was a prosperous time for Egypt and marked the pinnacle of its power.

Ptolemaic Kingdom: The Ptolemaic Kingdom was an Ancient Greek state in Egypt from 305 BC to 30 BC. Founded by Ptolemy I Soter, a general of Alexander the Great, it was ruled by the Ptolemaic dynasty for around 300 years. This dynasty marked a new era for a unique blend of Greek and Egyptian culture, and it ended with the death of Cleopatra VII.

Pharaoh: The term "Pharaoh" refers to the ancient Egyptian monarchs who ruled from the First Dynasty until Egypt's annexation by the Roman Empire in 30 BCE. While "king" was the more commonly used term during the New Kingdom, "pharaoh" began to be used during the reign of Akhenaten or Thutmose III.

Valley of the Kings: The Valley of the Kings in Egypt is an ancient burial site where pharaohs and powerful nobles were buried in rock-cut tombs during the New Kingdom period of ancient Egypt. This valley, also known as the Valley of the Gates of the Kings, was used for nearly 500 years between the Eighteenth and Twentieth Dynasties.

Kingdom of Aksum: The Kingdom of Aksum, also known as Axum or the Aksumite Empire, was a powerful kingdom in East Africa and South Arabia from ancient times to the Middle Ages. It was based in present-day Northern Ethiopia and Eritrea, extending into Djibouti and Sudan. The kingdom reached its peak during the reign of King Kaleb, expanding into Southern Arabia.

Bantu expansion: The Bantu expansion is a theory explaining the migration of the Proto-Bantu-speaking people from Central Africa. During their migration, they displaced, absorbed, or eliminated other groups they encountered, including hunter-gatherers and pastoralists.

Ancient Carthage: Ancient Carthage was a powerful civilization in North Africa, first established as a settlement in present-day Tunisia by the Phoenicians in the ninth century BC. It grew into a prosperous city-state and later an empire, reaching its peak in the fourth century BC. Carthage was the center of the Carthaginian Empire, led by the Punic people who dominated the western and central Mediterranean. However, following the Punic Wars, Carthage was destroyed by the Romans in 146 BC, only to be rebuilt by them later on.

Punic Wars: The Punic Wars were a series of three conflicts between Rome and Carthage that lasted from 264 to 146 BC. These wars were fought on land and sea in the western Mediterranean region and lasted for a total of forty-three years. The wars resulted in significant material and human losses for both sides. Additionally, the four-year-long revolt against Carthage in 241 BC is also considered part of the Punic Wars.

Nok culture: The Nok culture refers to a population in Nigeria whose artifacts, named after the village of Nok, were discovered in 1928. They are believed to have migrated from the Central Sahara, bringing along millet and pottery. The Nok people settled in the regions of Gajiganna and Nok, potentially migrating from the West African Sahel. The culture emerged around 1500 BCE and lasted until 1 BCE.

Nubia: Nubia is a region along the Nile river known for its early civilization, the Kerma culture, lasting from 2500 BC to 1500 BC. It was conquered by the New Kingdom of Egypt and ruled by its successors for 400 years. The region is famous for the Kingdom of Kush, which conquered Egypt in the 8th century BC and ruled as the 25th Dynasty.

Kingdom of Kush: The Kingdom of Kush, also called the Kushite Empire or simply Kush, was an ancient kingdom in Nubia. It was located along the Nile Valley in present-day northern Sudan and southern Egypt.

Land of Punt: The Land of Punt was an ancient kingdom that traded with Ancient Egypt, known for exporting gold, aromatic resins, blackwood, ebony, ivory, and wild animals. Recent evidence suggests it was located in northwestern Eritrea and may correspond to Opone in Somalia. Some Biblical scholars identify it with the biblical land of Put or Havilah.

Ancestral Puebloans: The Ancestral Puebloans, also called the Anasazi, were an ancient Native American culture in the United States, residing in present-day southeastern Utah, northeastern Arizona, northwestern New Mexico, and southwestern Colorado. Their origins can be traced back to the Oshara tradition and Picosa culture. The term "Anasazi" means "ancient enemies," given by the Navajo, but some contemporary Puebloans find it derogatory and object to its use.

Andean civilizations: The Andean civilizations were sophisticated societies in South America, spanning from Colombia to Argentina. They emerged on the Pacific coast and the oldest known civilization is the Caral in Peru. These civilizations developed independently and are considered one of the world's six "pristine" civilizations.

Chavín culture: The Chavín culture was a pre-Columbian civilization that existed from 900 BCE to 250 BCE in the northern Andean highlands of Peru. They influenced other civilizations along the Peruvian coast and resided in the Mosna Valley. The Chavín culture was characterized by a strong religious cult, advanced ceramics, improved agricultural techniques, and advancements in metallurgy and textiles.

Caral–Supe civilization: The Caral-Supe civilization was an advanced society in ancient Peru, with around 30 major cities. It thrived from 3500 BC to 1800 BC, and the oldest city, Huaricanga, was established around 3500 BC. This civilization is considered the oldest known in the Americas and one of six places where civilization originated independently in ancient times.

Mesoamerica: Mesoamerica is a historical region and cultural area in central and southern Mexico, Belize, Guatemala, El Salvador, Honduras, Nicaragua, and Costa Rica. It is known for its indigenous cultures and the shared development of cultural traits.

Maya civilization: The Maya civilization was an ancient Mesoamerican culture known for its advanced temples, intricate glyphs, and sophisticated writing system. They were highly skilled in art, architecture, mathematics, and had a complex calendar and astronomical system.

Olmecs: The Olmecs were an early Mesoamerican civilization. They lived in the tropical lowlands of modern-day Veracruz and Tabasco in Mexico. They may have had connections with the Mokaya and Mixe-Zoque cultures.

Zapotec civilization: The Zapotec civilization thrived in the Valley of Oaxaca in Mesoamerica for over 2,500 years. They established the impressive city of Monte Albán, which featured monumental buildings, ball courts, and intricate tombs with valuable gold jewelry. This city served as the heart of their powerful state, which controlled most of present-day Oaxaca, Mexico.

Paleo-Indians: Paleo-Indians were the earliest inhabitants of the Americas during the late Pleistocene period. They entered the continent during the final glacial episodes. The term refers to the ancient period in the Western Hemisphere and is different from the Paleolithic era.

Clovis culture: The Clovis culture, a prehistoric Paleoamerican archaeological culture, existed from around 11,500 to 10,800 BCE at the end of the Last Glacial Period. It is known for distinct stone and bone tools found with Pleistocene fauna, including mammoths, at Blackwater Locality No. 1 in New Mexico. These artifacts were first discovered in the 1920s but gained prominence after a significant find in 1936.

Peopling of the Americas: The Peopling of the Americas refers to the migration of Paleo-Indians from the Mammoth steppe in North Asia to North America via the Beringia land bridge during the Last Glacial Maximum. These populations quickly spread southward, occupying both North and South America around 12,000 to 14,000 years ago. The Paleo-Indians are the earliest known populations in the Americas. Linguistic factors, blood type distribution, and genetic composition link indigenous peoples of the Americas to Siberian populations.

Post-classical history: Post-classical history, from 500 CE to 1500 CE, denotes the expansion of civilizations and trade networks. It is also known as the medieval era, post-antiquity era, or pre-modern era.

Early Muslim conquests: The Early Muslim conquests, also known as the Arab conquests, were initiated by Muhammad in the 7th century. Under the Rashidun and Umayyad Caliphate, a new unified polity in Arabia rapidly expanded, establishing Muslim rule on three continents within a century. The conquests matched the speed and extent of Alexander the Great's and had long-lasting consequences.

Feudalism: Feudalism was a medieval system in Europe (9th-15th centuries) that structured society through land ownership in exchange for service and labor. It encompassed legal, economic, military, cultural, and political customs.

Serfdom: Serfdom refers to the status of peasants under feudalism in Europe. It involved debt bondage, indentured servitude, and similarities to slavery. This system developed during Late Antiquity and lasted until the mid-19th century in some countries.

Guild: A guild is a group of artisans and merchants who oversee their craft or trade in a specific area. They originated as professional associations and often relied on grants of letters patent from rulers to regulate trade and retain control over tools and materials. Local governments also regulated most guilds. Members who cheated the public faced fines or expulsion. Guildhalls, used as meeting places, are a lasting legacy.

Mongol Empire: The Mongol Empire was the largest empire in history from the 13th to 14th centuries. It originated in present-day Mongolia and stretched from Eastern Europe to parts of the Arctic. The empire also extended into the Indian subcontinent, attempted invasions of Southeast Asia, and conquered the Iranian Plateau. Additionally, it reached as far west as the Levant and the Carpathian Mountains.

Mongol invasions and conquests: The Mongol invasions and conquests occurred from the 13th to 14th centuries, leading to the establishment of the vast Mongol Empire (1206-1368) that covered a significant portion of Eurasia. This period is recognized as one of the most destructive in history, and scholars believe that the Mongols may have inadvertently spread the bubonic plague, contributing to the devastating Black Death in the 14th century.

Nobility: Nobility is a social class below royalty and often associated with aristocracy. It holds exclusive functions and advantages over non-nobles, varying by country and era. Membership is typically hereditary and passed through paternal lineage.

Boyar: Boyar refers to the highest nobility in Eastern European states, such as Bulgaria, Kievan Rus', Moldavia, Wallachia, Lithuania, and Baltic Germans. They ranked just below the ruling princes, grand princes, or tsars, and held significant power from the 10th to the 17th centuries.

Knight: A knight is an individual honored with knighthood for their service to the monarch, church, or country, often in a military role. This institution originates from ancient Greek and Roman traditions.

Chivalry: Chivalry is a code of conduct that developed in Europe between 1170 and 1220. It was associated with medieval Christian knighthood and governed the behavior of knights and gentlemen. The ideals of chivalry were widely popularized through medieval literature, such as the Matter of France and the Matter of Britain, which featured legendary figures like Charlemagne and King Arthur and his knights.

Samurai: Samurai were Japan's hereditary military nobility from the 12th century until the late 1870s. Serving as well-paid retainers of the daimyo (feudal landholders), they held high prestige, special privileges, and were abolished during the Meiji era.

Middle Ages: The Middle Ages, also known as the medieval period, spanned from around 500 AD to 1500. It was the middle era between antiquity and modern times. The medieval period is further divided into the Early, High, and Late Middle Ages. The early medieval period is sometimes called the Dark Ages.

Black Death: The Black Death was a devastating bubonic plague pandemic that occurred in Western Eurasia and North Africa from 1346 to 1353. It is the deadliest known pandemic in human history, resulting in the deaths of approximately 40% to 60% of Europe's population. The plague was caused by the bacterium Yersinia pestis, primarily spread through fleas. However, during this epidemic, it likely also spread through person-to-person contact, leading to a more contagious form known as pneumonic plague.

East–West Schism: The East-West Schism, also known as the Great Schism or Schism of 1054, refers to the ongoing separation between the Roman Catholic and Eastern Orthodox churches since 1054. The split resulted from a series of theological disputes, including disagreements regarding the procession of the Holy Spirit, the use of leavened or unleavened bread in the Eucharist, the Pope's claim to universal authority, and the position of the See of Constantinople within the pentarchy. Initially, the majority of Christians worldwide were Eastern Christians, with Western Christians making up the remaining portion.

House of Habsburg: The House of Habsburg, also called House of Austria, is a significant European dynasty known for its prominence throughout history.

House of Medici: The House of Medici was an influential Italian banking family and political dynasty that gained power in the Republic of Florence in the 15th century. They originated in Tuscany and established the prosperous Medici Bank, the largest in Europe at the time. Their financial success contributed to their rise to political prominence, although they were not officially monarchs until the 16th century.

Normans: The Normans were a medieval population that emerged in Normandy, resulting from the mixing of Norse Viking settlers, indigenous West Franks, and Gallo-Romans. They later migrated and conquered territories like England and Sicily. The Norse settlements in West Francia were established after raids from Denmark, Norway, and Sweden. The legitimacy of these settlements came after Rollo, a Viking leader, pledged allegiance to King Charles III of West Francia in 911. Over time, Normandy developed a distinct Norman identity that evolved throughout the centuries.

Franks: The Franks were a Germanic people living near the Lower Rhine during the Roman Empire. They expanded their influence in the Middle Ages, becoming the rulers of western Europe, particularly in and near France. Through their joint efforts during the crusades, they greatly influenced the region. The Franks initially ruled the area between the rivers Loire and Rhine, and later extended their power over other post-Roman kingdoms.

Hanseatic League: The Hanseatic League was a medieval alliance of merchant guilds and market towns in Central and Northern Europe. It began in the late 12th century with a few North German towns and expanded to include nearly 200 settlements across seven countries. It served as both a commercial and defensive confederation, facilitating trade and protecting its members. The League's influence stretched from Estonia to England, and from Poland to Denmark and Norway.

Holy Roman Empire: The Holy Roman Empire was a polity in Europe headed by the Holy Roman emperor. It existed for nearly 1000 years from the Early Middle Ages until its dissolution in 1806 during the Napoleonic Wars.

Inquisition: The Inquisition was a Catholic Church institution aimed at combating heresy through trials of suspected heretics. It began in 12th-century France and primarily targeted religious deviation among groups like Cathars and Waldensians. The Inquisition mostly resulted in penances, but unrepentant heretics were handed over to secular courts for execution or life imprisonment. The Medieval Inquisition, lasting until the mid-15th century, included investigations of other groups such as the Spiritual Franciscans, Hussites, and Beguines. Inquisitors were typically members of the Dominican Order, replacing local clergy as judges from the 1250s onward.

Investiture Controversy: The Investiture Controversy was a conflict in medieval Europe between the Church and the state over the appointment of bishops, abbots, and even the pope. It resulted in a power struggle between the Holy Roman Emperor and other European monarchies, leading to almost 50 years of conflict.

Kingdom of Germany: The Kingdom of Germany, formed in 843 by the Treaty of Verdun, was a primarily Germanic-speaking kingdom. It transitioned to the Ottonian dynasty in 919 and saw the king being elected by the stem duchies' rulers. In 962, Otto I became emperor, integrating East Francia into the Holy Roman Empire, alongside the Kingdom of Italy and, later, the Kingdom of Burgundy.

Knights Templar: The Knights Templar, also known as the Poor Fellow-Soldiers of Christ and of the Temple of Solomon, were a Catholic military order. Founded in 1119, they were based in Jerusalem and became one of the wealthiest and most influential orders in Western Christianity. The Knights Templar existed for around two centuries during the Middle Ages.

Northern Crusades: The Northern Crusades were military campaigns led by Catholic Christian orders and kingdoms to colonize and convert pagan Baltic, Finnic, and West Slavic peoples in the Baltic Sea region. These campaigns were conducted against both Orthodox Christian Slavs and non-Christian populations.

Ostsiedlung: Ostsiedlung refers to the medieval migration of ethnic Germans into Eastern Francia, East Francia, and the Holy Roman Empire and beyond. It resulted in the development of settlements and changes in social structures in areas previously inhabited by Slavic, Baltic, and Finnic peoples. Germania Slavica was the most settled region, but other areas were also affected. The Ostsiedlung covered regions such as Germany, Lower Austria, Styria, Livonia, Poland, Czech Republic, Slovakia, Slovenia, Hungary, and Transylvania.

House of Plantagenet: The House of Plantagenet, originating in Anjou, consists of four distinct royal houses identified by the name. This includes the Angevins and the main line of Plantagenets after losing Anjou, as well as the cadet branches of Lancaster and York. They ruled England from 1154, with Henry II, until 1485, when Richard III passed away.

Viking Age: The Viking Age (793–1066 CE) was a time during the Middle Ages when Norsemen known as Vikings conducted mass raiding, colonization, conquest, and trade across Europe, even reaching North America. It followed the Migration Period and the Germanic Iron Age, encompassing not only Scandinavia but also settlements by Scandinavians in various places. The term "Vikings" is commonly used to refer to the Scandinavians of this era, although most of them were not pirates.

Vikings: The Vikings were seafaring people from Scandinavia who raided, traded, and settled across Europe from the late 8th to the late 11th centuries. They explored as far as the Mediterranean, North Africa, the Middle East, Greenland, and Vinland. The Viking Age, as this period is known, had a significant influence on the early medieval history of Scandinavia, the British Isles, France, Estonia, and Kievan Rus'.

Wends: The term 'Wends' historically referred to Slavs living in northeastern Germany, encompassing diverse peoples and tribes. Today, Wendish communities are found in Slovenia, Austria, Lusatia, the United States, and Australia.

Anglo-Saxons: The Anglo-Saxons were a cultural group in Early Middle Ages England, speaking Old English. They originated from Germanic settlers who came to Britain in the 5th century. They developed their culture by interacting with the existing Romano-British culture. Most people in southern, central, northern, and eastern England identified as Anglo-Saxon and spoke Old English. Danish and Norman invasions later brought changes, but Anglo-Saxon language and political structures were the basis for the medieval Kingdom of England and Middle English. Old English heavily influenced modern English, accounting for around 26% of its words.

Battle of Hastings: The Battle of Hastings in 1066 marked the start of the Norman Conquest of England. Norman-French forces, led by William, Duke of Normandy, defeated the Anglo-Saxon army led by King Harold Godwinson. The battle took place near present-day Battle, East Sussex and resulted in a decisive victory for the Normans.

Kingdom of England: The Kingdom of England was a powerful sovereign state on Great Britain from the 10th century until 1707 when it combined with Scotland to form the Kingdom of Great Britain. It emerged from several Anglo-Saxon kingdoms and was a prominent European state in the medieval and early modern colonial eras.

Norman Conquest: The Norman Conquest was an invasion and occupation of England in the 11th century. Led by the Duke of Normandy, William the Conqueror, a diverse army of Norman, French, Flemish, and Breton soldiers conquered England.

Wars of the Roses: The Wars of the Roses were a series of civil wars fought in England between 1455 and 1487. These wars were fought between supporters of two rival branches of the royal House of Plantagenet: Lancaster and York. The wars led to the extinction of the House of Lancaster in 1471 and the House of York in 1485. The conflicts ended with a politically arranged marriage that united the Houses of Lancaster and York, creating a new dynasty known as the Tudors. This new dynasty resolved the conflict by inheriting the claims of both factions.

Carolingian Empire: The Carolingian Empire was a dominant empire in western and central Europe during the Early Middle Ages. It was ruled by the Carolingian dynasty, starting in 751 as kings of the Franks and later kings of the Lombards in Italy from 774. In 800, Charlemagne, the Frankish king, became emperor in Rome, marking an attempt to transfer the Roman Empire to Western Europe. The Carolingian Empire is seen as the initial phase of the Holy Roman Empire's history.

Capetian dynasty: The Capetian dynasty, also known as the "House of France," is one of Europe's largest and oldest royal houses. It started with Hugh Capet in 987 and continued uninterrupted until 1792, ruling France. After that, different branches such as Valois and Bourbon took over until the French Revolution in 1792. The Bourbons saw a brief restoration from 1814 to 1830 before being replaced by the last Capetian monarch, Louis Philippe I. Cadet branches of the Capetian House, the Bourbons, still reign in Spain and Luxembourg.

Merovingian dynasty: The Merovingian dynasty ruled the Franks from the 5th century to 751. They united the Franks and Gallo-Romans, conquered Gaul, defeated the Visigoths and Burgundians, expanded into Raetia, and gained lordship over the Alemanni, Bavarii, and Saxons. Their realm became the largest and most powerful in Western Europe after the decline of Theodoric the Great's empire.

Duchy of Burgundy: The Duchy of Burgundy was established in the 9th century as a successor of the ancient Kingdom of the Burgundians. It became part of the Frankish Empire after its conquest in 532. In the 9th century, the French portion of the Burgundian kingdom became a duchy under King Robert II of France in 1004. The duchy was later passed down to King Henry I of France, who gave it to his younger brother Robert in 1032.

Kingdom of France: The Kingdom of France was a powerful European state during the medieval and early modern period. It had colonies in Asia, Africa, and North America, with New France being the largest.

Hundred Years' War: The Hundred Years' War was a series of conflicts between England and France in the Late Middle Ages. It started because of English claims to the French throne and involved other European powers. Lasting 116 years, the war had intermittent truces.

Francia: Francia, also known as the Kingdom of the Franks or the Frankish Empire, was a powerful barbarian kingdom in Western Europe. It was ruled by the Merovingian and Carolingian dynasties during the Early Middle Ages. Francia was the largest surviving Germanic kingdom from the Migration Period era.

Gothic War (535–554): The Gothic War (535–554) was a conflict between the Eastern Roman Empire and the Ostrogothic Kingdom of Italy. It took place in various regions including Italy, Dalmatia, Sardinia, Sicily, and Corsica. This war was part of the ongoing Gothic Wars against the Roman Empire. Emperor Justinian I sought to regain the provinces lost by the Western Roman Empire during the Migration Period.

Guelphs and Ghibellines: The Guelphs and Ghibellines were opposing factions in medieval Italy. The Guelphs supported the Pope, while the Ghibellines supported the Holy Roman Emperor. They existed in the city-states of Central and Northern Italy and were active during the Middle Ages.

Kingdom of Sicily: The Kingdom of Sicily was a state located in southern Italy and Ifriqiya from 1130 to 1816. It was established by Roger II and succeeded the County of Sicily. The island was divided into three regions: Val di Mazara, Val Demone, and Val di Noto.

Lombards: The Lombards, a Germanic people, ruled over the majority of the Italian Peninsula from 568 to 774.

Republic of Genoa: The Republic of Genoa was a maritime republic in Liguria, Italy from 1099 to 1797. It was a dominant commercial power in the Mediterranean and Black Seas and a significant financial center in Europe during the 16th and 17th centuries.

Republic of Venice: The Republic of Venice, also known as La Serenissima, was a sovereign state and maritime republic in Italy that lasted for over 1,100 years (697-1797). It was centered around the prosperous city of Venice and had overseas territories in Croatia, Slovenia, Montenegro, Greece, Albania, and Cyprus. Venice became a major trading power during the Middle Ages and further strengthened its position during the Renaissance. The majority of its citizens spoke Venetian, but the use of Italian, Latin, and Medieval Greek also became prevalent.

Papal States: The Papal States were territories in Italy ruled directly by the Pope from 756 to 1870. They were prominent in Italy from the 8th century until Italy's unification in 1870.

Al-Andalus: Al-Andalus refers to the Muslim-ruled region in the Iberian Peninsula. It encompasses modern Spain, Portugal, and France. The term describes the various Islamic states that controlled these territories from 711 to 1492. Al-Andalus reached its largest extent under Umayyad rule, covering most of the peninsula and part of southern France. However, it experienced constant boundary changes due to the Reconquista, eventually contracting to the south and becoming the Emirate of Granada.

Caliphate of Córdoba: The Caliphate of Córdoba was an Arab Islamic state ruled by the Umayyad dynasty from 929 to 1031. Its territory included Iberia and parts of North Africa, with its capital in Córdoba. It followed the Emirate of Córdoba and was proclaimed as a caliphate by Abd ar-Rahman III in 929. This period was known for its thriving trade, cultural expansion, and the creation of remarkable architecture in al-Andalus.

Reconquista: The Reconquista was a series of Christian military campaigns against Muslim kingdoms in al-Andalus, following the Umayyad conquest of Hispania. It started with the Battle of Covadonga, marking the first Christian victory over the Umayyad Caliphate. The Reconquista concluded in 1492 when the Catholic Monarchs conquered the Nasrid kingdom of Granada.

Kingdom of Aragon: The Kingdom of Aragon was a medieval and early modern kingdom in Spain. It corresponds to the modern-day autonomous community of Aragon. It should not be confused with the larger Crown of Aragon, which included other territories administered separately.

Kingdom of Castile: The Kingdom of Castile was a medieval polity in the Iberian Peninsula. It originated from the County of Castile and gained autonomy in the 10th century. In 1065, it became an independent kingdom. It was united with León multiple times but permanently joined after 1230. Castilian kings conquered lands from Islamic principalities in southern Iberia. Castile and León, along with their southern acquisitions, formed the Crown of Castile. This term also included their overseas expansion.

Visigothic Kingdom: The Visigothic Kingdom was a Germanic successor state to the Western Roman Empire, lasting from the 5th to 8th centuries. It encompassed present-day southwestern France and the Iberian Peninsula. Originally established by the Visigoths under King Wallia in Gaul, it expanded through conquest to control all of Hispania. The Kingdom maintained independence from the Byzantine Empire, which made limited and short-lived attempts to regain Roman authority in Hispania.

Pannonian Avars: The Pannonian Avars were a nomadic alliance from Eurasia. They established the Avar Khaganate, which covered the Pannonian Basin and parts of Central and Eastern Europe from the 6th to the 9th century. Also known as Obri, Abaroi/Varchonitai/Pseudo-Avars, or Apar to the Göktürks.

Kingdom of Bohemia: The Kingdom of Bohemia, also known as the Czech Kingdom, was a medieval and early modern monarchy in Central Europe. It served as the forerunner to the present-day Czech Republic.

First Bulgarian Empire: The First Bulgarian Empire, founded in the 7th century, was a medieval state in Southeastern Europe. It expanded its territory from the Danube Bend to the Black Sea, becoming a significant power in the region. This empire competed with the Byzantine Empire and became a major cultural and spiritual center in South Slavic Europe during the Middle Ages.

Second Bulgarian Empire: The Second Bulgarian Empire was a medieval state (1185-1422) that succeeded the First Bulgarian Empire. It thrived under Tsars Kaloyan and Ivan Asen II until the Ottomans gradually conquered it in the 15th century.

Byzantine Empire: The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centered in Constantinople. It survived the fall of the Western Roman Empire and remained a powerful force in the Mediterranean world until its ultimate collapse in 1453. The empire was known for its economic, cultural, and military dominance. While its citizens referred to themselves as Romans, the term "Byzantine Empire" was coined after its demise. The empire distinguished itself from its earlier Roman counterpart through its relocation to Byzantium, adoption of state Christianity, and the predominance of Greek over Latin.

Arab–Byzantine wars: The Arab-Byzantine wars were a series of conflicts between Muslim Arab dynasties and the Byzantine Empire from the 7th to the 11th century. It began during the Muslim conquests in the 7th century and continued until the mid-11th century.

Byzantine–Bulgarian wars: The Byzantine-Bulgarian wars were a series of conflicts between the Byzantine Empire and Bulgaria that began in 680 AD. The two empires continued to fight for about a century, with the Bulgarians, led by Krum, achieving significant victories. After Krum's death, his son Omurtag negotiated a thirty-year peace treaty. Simeon I of Bulgaria had successful campaigns against the Byzantines during his rule from 893 to 927. His son Peter I negotiated another long-lasting peace treaty. However, the Bulgarian state later experienced a period of decline.

Byzantine–Ottoman wars: The Byzantine-Ottoman wars were a series of conflicts between the Byzantine Greeks and Ottoman Turks, resulting in the downfall of the Byzantine Empire and the rise of the Ottoman Empire. The weakened Byzantines, unable to recover under the Palaiologos dynasty, suffered devastating defeats at the hands of the Ottomans. The wars concluded with the loss of Constantinople in 1453, marking the end of the conflicts.

Fall of Constantinople: The Fall of Constantinople refers to the capture of the Byzantine Empire's capital by the Ottoman Empire on May 29, 1453, after a 53-day siege. This event marked the end of the Byzantine Empire and was a significant turning point in history.

Cumans: The Cumans, also known as Kumans, were Turkic nomads from Central Asia. They belonged to the Cuman-Kipchak confederation and spoke the Cuman language. Known as Polovtsy in Rus', Cumans in the West, and Kipchaks in the East.

Kingdom of Galicia–Volhynia: The Kingdom of Galicia-Volhynia, also known as the Kingdom of Ruthenia, existed from 1199 to 1349. It was a medieval state in Eastern Europe, with its territory primarily in present-day Ukraine. It played a crucial role in the aftermath of the collapse of Kievan Rus' alongside Novgorod and Vladimir-Suzdal. The main language spoken was Old East Slavic, and Eastern Orthodoxy was the official religion.

Grand Duchy of Lithuania: The Grand Duchy of Lithuania was a European state from the 13th to the late 18th century, encompassing present-day Lithuania, Belarus, and parts of Poland, Ukraine, and Russia. Founded by Lithuanians, it emerged from united Baltic tribes and embraced polytheism. Eventually partitioned in 1795, its territory was divided among the Russian Empire, Kingdom of Prussia, and Habsburg Empire.

Principality of Moscow: The Principality of Moscow, also known as Muscovy, was a medieval principality centered on Moscow. It later became the Tsardom of Russia. The rulers of Moscow were descendants of the first prince, Daniel, from the Rurikid dynasty.

Kingdom of Hungary: The Kingdom of Hungary was a monarchy in Central Europe for almost 1000 years. It emerged as a Christian kingdom in 1000 AD under King Stephen I. The monarchy was led by his family for 300 years. By the 12th century, Hungary became a significant power in Europe.

Hussite Wars: The Hussite Wars, also known as the Bohemian Wars or the Hussite Revolution, were a series of civil conflicts from 1419 to 1434. They involved the Hussites, a religious group, fighting against the combined forces of the Holy Roman Emperor, the Papacy, and European monarchs loyal to the Catholic Church. The Utraquists, a faction within the Hussites, eventually switched sides to support the Catholics.

Khazars: The Khazars were a Turkic nomadic people who established a powerful commercial empire in modern-day Russia, Ukraine, Crimea, and Kazakhstan in the late 6th century CE. They controlled a strategically significant region along the Silk Road, acting as a vital trading hub between China, the Middle East, and Kievan Rus'. For around 300 years, they dominated a vast territory from the Volga-Don steppes to the eastern Crimea and the northern Caucasus.

Kievan Rus': Kievan Rus' was a state in Eastern and Northern Europe from the 9th to the 13th century. It was ruled by the Rurik dynasty and comprised various peoples such as East Slavic, Norse, and Finnic. The modern nations of Belarus, Russia, and Ukraine consider Kievan Rus' their cultural ancestor, with its name derived from present-day Ukraine's capital. At its height, Kievan Rus' stretched from the White Sea to the Black Sea and from the Vistula River to the Taman Peninsula, uniting East Slavic tribes.

Great Moravia: Great Moravia, also known as Moravia, was the initial significant state predominantly inhabited by West Slavs in Central Europe. It potentially encompassed areas now within the Czech Republic, Slovakia, Hungary, Austria, Germany, Poland, Romania, Croatia, Serbia, and Ukraine. Preceding formations in these lands were the tribal union of Samo and the Pannonian Avar state.

Novgorod Republic: The Novgorod Republic was a medieval state in northern Russia from the 12th to 15th centuries, with Novgorod as its capital. It stretched from the Gulf of Finland to the northern Ural Mountains. The republic thrived as an influential trading post of the Hanseatic League, and its people were heavily influenced by Byzantine culture.

Polish–Lithuanian–Teutonic War: The Polish-Lithuanian-Teutonic War (1409-1411) was a conflict between the Teutonic Knights and the Kingdom of Poland and Grand Duchy of Lithuania. It started with a Teutonic invasion of Poland, sparked by a Samogitian uprising. A nine-month truce was brokered by Wenceslaus IV of Bohemia due to both sides' lack of readiness for a full-scale war.

Rurikids: The Rurik dynasty, or Rurikids, was a noble lineage founded by Prince Rurik, who supposedly settled in Novgorod in 862. They ruled Kievan Rus' and its principalities after its disintegration.

Teutonic Order: The Teutonic Order, founded around 1190 in Acre, supported Christian pilgrims and established hospitals in the Holy Land. Also known as the Teutonic Knights, they were a Catholic crusading military order, promoting Catholic rule in the Holy Land and the Baltics. Additionally, they provided military protection for Catholics in Eastern Europe.

Vladimir-Suzdal: Vladimir-Suzdal, also known as the Principality of Vladimir-Suzdal, was a major principality in Russia from 1157 to 1331. It succeeded Kievan Rus' and was centered in Vladimir-on-Klyazma. After being conquered by the Mongol Empire, it became a self-governed state under its own nobility. The principality later divided into smaller principalities, and a jarlig from the Golden Horde mandated a governorship by a Rurikid sovereign.

Volga Bulgaria: Volga Bulgaria was a historical Bulgar state in European Russia from the 7th to 13th centuries. It was located at the confluence of the Volga and Kama rivers. The state was multi-ethnic, with Bulgars, Volga Finns, Varangians, and East Slavs. Volga Bulgaria had a strategic position that allowed it to establish a trade monopoly with Norse, Cumans, and Pannonian Avars.

Ajuran Sultanate: The Ajuran Sultanate, also known as Ajuuraan, was an influential Somali Empire in the Middle Ages. It controlled trade in the northern Indian Ocean and ruled over large parts of the Horn of Africa. The empire successfully defended itself against Oromo and Portuguese invasions, and re-established ancient maritime trading routes. The coastal provinces experienced a flourishing trade with various kingdoms and empires from Asia, Europe, and Africa.

Almoravid dynasty: The Almoravid dynasty was an imperial Muslim dynasty centered in present-day Morocco that ruled from the 11th to the 12th century. They formed a coalition of nomadic Berber tribes and built an empire stretching across the western Maghreb and Al-Andalus. Marrakesh was established as their capital city. Eventually, they were overthrown by the Almohads in 1147.

Fatimid Caliphate: The Fatimid Caliphate was a Shi'a dynasty ruling from the 10th to the 12th centuries. Descending from Prophet Muhammad's daughter, Fatima, they were acknowledged as the true imams by various Isma'ili communities. Originally part of the Abbasid Caliphate, the Fatimids conquered Ifriqiya, established al-Mahdiyya, and later made Egypt their capital. Spanning North Africa and West Asia, their rule extended from the Mediterranean to the Red Sea, including parts of Maghreb, Sicily, the Levant, and the Hejaz.

Ghana Empire: The Ghana Empire, also known as Ghana, Ghanata, or Wagadou, was a West African classical to post-classical era empire located in present-day Mauritania and Mali. It existed from around the 4th century B.C.E to the 1300s C.E. After the collapse of the Dhar Tichitt culture, the empire emerged between the 1st and 3rd centuries C.E. It was an influential state in the region until its eventual dissolution in the 1300s.

Kanem–Bornu Empire: The Kanem–Bornu Empire was a historical realm in present-day Nigeria, Niger, Cameroon, Libya, and Chad. Referred to as the Kanem Empire by Arab geographers since the 8th century AD, it later became the independent kingdom of Bornu, which lasted until 1900.

Mali Empire: The Mali Empire was a prominent West African empire (1226-1670) founded by Sundiata Keita. It was known for its incredibly wealthy rulers, notably Mansa Musa. Mali reached its height as the largest empire in West Africa, spreading its language, laws, and customs, profoundly influencing the region's culture.

Songhai Empire: The Songhai Empire was a powerful African state in the 15th-16th centuries, known for its size and influence. It was ruled by the Songhai people, with Gao as its capital. Timbuktu and Djenné were important trade cities that were later conquered. The empire was initially led by the Sonni dynasty and later replaced by the Askia dynasty.

Trans-Saharan trade: The Trans-Saharan trade is the exchange of goods between sub-Saharan Africa and North Africa, involving travel across the Sahara desert. This trade flourished from the 8th century to the early 17th century. The Sahara was once a different environment, with pastoralism, settlements, and pottery in Libya and Algeria since 7000 BC. Cattle were introduced to the Central Sahara around 4000-3500 BC. Notably, ancient rock paintings in currently arid regions depict plants and animals that no longer exist in the modern desert.

Aztecs: The Aztecs were a Mesoamerican culture that thrived in central Mexico from 1300 to 1521. They were a diverse group of people who spoke the Nahuatl language and controlled parts of Mesoamerica for centuries. They had city-states that sometimes formed alliances or empires, and the most notable of these was the Aztec Empire, which consisted of three city-states. The term "Aztecs" is used to refer to Mexica of Tenochtitlan and other Nahua groups in both the prehispanic and Spanish colonial eras. The meaning of "Aztec" has been debated by scholars since the 19th century.

Inca Empire: The Inca Empire, known as Tawantinsuyu, was the largest pre-Columbian empire in the Americas. Its capital was Cusco in Peru. Emerging in the 13th century, it encompassed a vast territory. However, it was conquered by the Spanish, and by 1572, the empire was completely subdued.

Chimor: Chimor was a political group of the Chimú culture, which emerged around 900 CE after the decline of the Moche culture. It was conquered by the Inca emperor Topa Inca Yupanqui in 1470 and spanned a vast coastline of 1,000 kilometers during the Late Intermediate Period.

Mississippian culture: The Mississippian culture was a Native American civilization that thrived from 800 to 1600 in the Midwest, East, and Southeastern United States. They built large earthen mounds and had urban settlements linked by trade networks. Cahokia, the largest city and religious center, was located in southern Illinois.

Moche culture: The Moche culture thrived in northern Peru from around 100 to 700 AD. They were not a centralized empire, but instead a collection of autonomous polities sharing a common culture. They left behind remarkable iconography and monumental architecture.

Pre-Columbian era: The Pre-Columbian era refers to the time before European colonization in the Americas. It starts with the first inhabitation of the Americas and ends when Indigenous cultures were significantly affected by Europeans. This era covers a wide range of Indigenous history until Christopher Columbus's voyage in 1492, and sometimes even beyond.

Wari culture: The Wari culture refers to an ancient civilization that thrived in modern-day Peru from 500 to 1000 AD. They were located in the south-central Andes region as well as the coastal area.

Islamic Golden Age: The Islamic Golden Age, from the 8th to the 13th century, marked an outstanding era of scientific, economic, and cultural prosperity in Islamic history.

Crusades: The Crusades were a series of religious wars led by the Christian Latin Church in the Middle Ages. They aimed to reconquer Jerusalem and surrounding areas from Muslim rule. The First Crusade was successful in conquering Jerusalem in 1099, leading to numerous subsequent military campaigns. The Crusades played a pivotal role in European history for centuries but declined after the 15th century.

Crusader states: Crusader states were Catholic polities established in the Levant from 1098 to 1291. These states were created following the First Crusade to reclaim the Holy Land. The four states were the County of Edessa, the Principality of Antioch, the County of Tripoli, and the Kingdom of Jerusalem. They covered regions in modern-day Turkey, Syria, Lebanon, Israel, Palestine, and Jordan. The term "Outremer" is often used as a synonym for Crusader states.

Ottoman Empire: The Ottoman Empire, also called the Turkish Empire, was a vast empire that governed Southeast Europe, West Asia, and North Africa from the 14th to the early 20th centuries. It extended its control over parts of southeastern Central Europe from the 16th to the 18th century.

Abbasid Caliphate: The Abbasid Caliphate, founded by a dynasty descended from Muhammad's uncle, ruled from Baghdad in modern-day Iraq after overthrowing the Umayyad Caliphate in 750 CE. The revolution began in Khorasan and later moved to Baghdad, which became a center of learning and cultural exchange known as the "Centre of Learning."

Sultanate of Rum: The Sultanate of Rum was a Turco-Persian Sunni Muslim state that emerged after the Seljuk Turks conquered Byzantine territories and peoples in Anatolia. The name "Rum" was used to refer to the Eastern Roman Empire and its people, derived from ancient Aramaic, Parthian, and Greek names for Rome.

Umayyad Caliphate: The Umayyad Caliphate, also known as the Umayyad Empire, was the second caliphate after Muhammad's death. It was ruled by the Umayyad dynasty, with Muawiya as the first caliph. Syria was their main power base with Damascus as the capital.

Mamluk: The Mamluks were enslaved soldiers and mercenaries who held influential positions in the military and administration of Arab and Ottoman dynasties in the Muslim world. They were ethnically diverse and originated from non-Arab backgrounds, later gaining freedom in certain cases.

Aq Qoyunlu: The Aq Qoyunlu, also known as the White Sheep Turkomans, were a Sunni Turkoman tribal confederation in the Diyarbakir region. They ruled eastern Turkey from 1378 to 1503, expanding their empire to include Armenia, Azerbaijan, parts of Iran, Iraq, and Oman. The Aq Qoyunlu empire thrived under Uzun Hasan.

Göktürks: The Göktürks, also known as the Türks or Blue Turks, were a nomadic confederation of Turkic peoples in medieval Inner Asia. They succeeded the Rouran Khaganate and established the First Turkic Khaganate, shaping the future geolocation, culture, and beliefs of Turkic peoples.

Golden Horde: The Golden Horde was a Mongol and later Turkicized khanate established in the 13th century. It originated as the northwestern sector of the Mongol Empire and became a separate khanate after the division of the empire in 1259. Also known as the Kipchak Khanate or Ulus of Jochi, it replaced the earlier Cuman-Kipchak confederation.

Qara Qoyunlu: The Qara Qoyunlu, also called the Black Sheep Turkomans, were Persian-influenced Muslim Turkoman rulers who controlled the region now known as Azerbaijan, Armenia, Iran, Turkey, and Iraq from 1374 to 1468.

Muslim conquest of Persia: The Muslim conquest of Persia was a military campaign led by the Rashidun Caliphate from 632 to 654, resulting in the downfall of the Sasanian Empire and the decline of the Zoroastrian religion in Iran.

Khwarazmian Empire: The Khwarazmian Empire was a Persianate, Sunni Muslim empire of Turkic mamluk origin. It ruled over regions of Central Asia, Afghanistan, and Iran from 1077 to 1231. Initially, it was a vassal of other empires but later became independent rulers. The empire was eventually conquered by the Mongols in 1219-1221.

Seljuk Empire: The Seljuk Empire, a prominent medieval empire, was founded and governed by the Qïnïq branch of Oghuz Turks. It stretched from Anatolia and the Levant to the Hindu Kush, and from Central Asia to the Persian Gulf, covering 3.9 million square kilometers. It embodied a blend of Turkic and Persian cultural influences.

Uyghur Khaganate: The Uyghur Khaganate was a Turkic empire in the mid-8th to 9th centuries, governed by the Orkhon Uyghur nobility. It functioned as a tribal confederation called Jiu Xing in Chinese, and Toquz Oghuz or Toquz Tughluq in the native language.

Delhi Sultanate: The Delhi Sultanate was a medieval empire centered in Delhi that spanned over the Indian subcontinent for 320 years (1206-1526). After the Ghurid invasion, it was ruled successively by five dynasties: Mamluk, Khalji, Tughlaq, Sayyid, and Lodi. The Sultanate covered vast territories in present-day India, Pakistan, Bangladesh, and parts of southern Nepal.

Muslim conquests in the Indian subcontinent: The Muslim conquests in the Indian subcontinent occurred from the 13th to the 18th centuries. Earlier invasions took place in the northwestern region, including the Umayyad campaigns in the 8th century, and faced resistance from the Rajputs.

Vijayanagara Empire: The Vijayanagara Empire was a medieval Indian empire that covered much of Southern India. It was established in 1336 by Harihara I and Bukka Raya I, and grew by defeating southern dynasties and resisting Muslim invasions. At its peak, it conquered most of Southern India and expanded to regions near the Krishna River.

Five Dynasties and Ten Kingdoms period: The Five Dynasties and Ten Kingdoms period was a time of political turmoil in Imperial China from 907 to 979. Numerous dynastic states emerged in the Central Plain and South China, leading to a prolonged period of political division in Chinese history.

Goryeo: Goryeo was a Korean state from 918 to 1392, which unified the Korean Peninsula and incorporated ruling class from the northern kingdom of Balhae. The name "Korea" is derived from Goryeo and it played a crucial role in merging the identities of Goguryeo, Baekje, and Silla. Goryeo was the successor state to Later Goguryeo and Goguryeo.

Heian period: The Heian period (794-1185) is the last division of classical Japanese history. It signifies a time of cultural growth and declining Chinese influence. The imperial court flourished, showcasing notable art, particularly poetry and literature. This era witnessed the emergence of katakana and hiragana, unique Japanese scripts that led to the creation of renowned vernacular literature, often composed by court women.

Jin dynasty (1115–1234): The Jin dynasty, also known as the Great Jin or Jurchen Jin, was an imperial dynasty in China (1115-1234). It is often written as Kin, Jinn, or Chin in English to distinguish it from an earlier Jin dynasty. Ruled by the Wanyan clan, who were of Jurchen descent.

Liao dynasty: The Liao dynasty, or Khitan Empire, was an imperial dynasty in China from 916 to 1125. It was ruled by the Yelü clan of the Khitan people and emerged after the fall of the Tang dynasty. The Liao dynasty controlled Northeast China, the Mongolian Plateau, northern Korea, parts of the Russian Far East, and the northern tip of the North China Plain.

Ninja: Ninjas, also known as shinobi, were covert agents in feudal Japan trained in martial arts, including ninjutsu. They excelled in siege, infiltration, ambush, reconnaissance, espionage, deception, and bodyguarding. Despite their remarkable skills, their irregular warfare tactics were considered dishonorable compared to the samurai. The origins of ninjas can be traced back to at least the 12th century, with their prominence emerging in the 15th century during the Sengoku period.

Song dynasty: The Song dynasty was a Chinese imperial dynasty from 960 to 1279. It was founded by Emperor Taizu, who overthrew the Later Zhou dynasty and united the Ten Kingdoms. The Song often clashed with the Liao, Western Xia, and Jin dynasties in the north. After retreating from the Jin dynasty's attacks, the Song was eventually conquered by the Yuan dynasty led by the Mongols.

Sui dynasty: The Sui dynasty was a short-lived Chinese imperial dynasty from 581 to 618. It reunified China and ended a period of political division. The Sui rebuilt the country, reformed imperial institutions, and laid the foundation for the prosperous Tang dynasty.

Tang dynasty: The Tang dynasty was an imperial dynasty in China from 618 to 907. It was a high point in Chinese civilization and known for its cosmopolitan culture. The Tang rulers expanded their territory through military campaigns, rivaling the Han dynasty in size.

An Lushan rebellion: The An Lushan rebellion was an eight-year civil war in the Tang dynasty caused by a commandery rebellion. It aimed to overthrow the Imperial Government and establish the Yan dynasty. It was led by An Lushan and later by his son An Qingxu before being taken over by Shi Siming and then Shi Chaoyi. The rebellion was ultimately crushed by Tang loyalists. It is also known as the An-Shi rebellion or Tianbao Chaos in Chinese history.

Tibetan Empire: The Tibetan Empire was a powerful empire on the Tibetan Plateau, founded in the 7th century. It expanded under the reign of Songtsen Gampo, Trisong Detsen, and Rapalchen. In its peak, it stretched from Chang'an to modern India and the Bay of Bengal.

Yuan dynasty: The Yuan dynasty, also known as the Great Yuan, was a Mongol-led imperial dynasty in China that lasted from 1271 to 1368. Kublai Khan, the fifth khagan-emperor of the Mongol Empire, established this dynasty after the division of the empire. It succeeded the Song dynasty and was followed by the Ming dynasty in Chinese history.

Champa: Champa was a collection of Cham polities in central and southern Vietnam from the 2nd century AD until 1832. It emerged after a rebellion against Chinese rule and lasted until it was annexed by the Vietnamese Nguyen dynasty. Champa was known by different names in different languages and had significant influence in the region.

Khmer Empire: The Khmer Empire, also known as Kambuja, was a Hindu-Buddhist empire in Southeast Asia centered around hydraulic cities in modern-day northern Cambodia. Lasting from 802 to 1431, it emerged from the previous Chenla civilization and is referred to as the Angkor period in Cambodian history. The empire's capital, Angkor, gave it its name. The Khmer Empire controlled or influenced most of mainland Southeast Asia and even reached into southern China, making it larger than the Byzantine Empire at its height.

Majapahit: Majapahit, also called Wilwatikta, was a dominant Hindu-Buddhist empire in Southeast Asia (1293-1527), centered on Java. Led by Hayam Wuruk and his wise prime minister, Gajah Mada, it thrived from 1350 to 1389 and expanded vast conquests throughout the region. The Nagarakretagama (1365) mentioned Majapahit as an empire with 98 tributaries, encompassing present-day Indonesia, Singapore, Malaysia, Brunei, southern Thailand, Timor Leste, and southwestern Philippines, yet discussions persist about the empire's exact reach and influence over its vassals.

Malacca Sultanate: The Malacca Sultanate was a Malay dynasty centered in present-day Malacca, Malaysia. It was established around 1400 by King Parameswara, also known as Iskandar Shah. The sultanate became a major port and controlled vast territories including the Malay Peninsula, Riau Islands, and part of Sumatra.

Pagan Kingdom: The Pagan Kingdom was the first Burmese kingdom, which unified the areas that now make up Myanmar. Its 250-year rule established Burmese language and culture, expanded Bamar ethnicity in Upper Myanmar, and promoted the growth of Theravada Buddhism in Myanmar and mainland Southeast Asia.

Srivijaya: Srivijaya was a Buddhist empire based on Sumatra that greatly influenced Southeast Asia from the 7th to the 11th century AD. It was the first power to dominate western Maritime Southeast Asia and expanded Buddhism in the region. Due to its strategic location, Srivijaya developed advanced maritime technology and had a thriving economy driven by trade, which made it a prestigious center for luxury goods.

Trần dynasty: The Trần dynasty was a Vietnamese dynasty that ruled from 1225 to 1400. It was founded by Emperor Trần Thái Tông after the overthrow of the Lý dynasty. The Trần dynasty successfully fought off three Mongol invasions, most notably at the Battle of Bạch Đằng River in 1288. The dynasty ended when the final emperor, Thiếu Đế, was forced to abdicate in 1400 at the age of five, in favor of his maternal grandfather, Hồ Quý Ly.

Modern era: The modern era refers to the time following the post-classical era, from around 1500 AD until today. It is primarily used in European and Western history to describe this period.

Early modern period: The early modern period is a historical era in Europe, spanning from the 16th to the 19th centuries. It follows the Middle Ages and precedes modernity. The timeline may vary depending on the area studied. It is considered a part of the broader concept of modernity and is often used globally, even in the absence of a corresponding medieval period.

Age of Discovery: The Age of Discovery, also known as the Age of Exploration, was a period from the 15th to the 17th century. European seafarers explored and conquered regions around the world. This period experienced extensive overseas exploration and colonization, led by the Spanish, Portuguese, and later the Dutch, English, and French. It marked the rise of colonialism as a government policy in several European states and is often associated with the first wave of European colonization.

Magellan expedition: The Magellan expedition, led by Ferdinand Magellan, was a Spanish voyage in the 16th century to reach the Moluccas. It began in 1519 and was completed in 1522 by Juan Sebastián Elcano after Magellan's death. The expedition achieved the first-ever circumnavigation of the world, crossing the Atlantic, Pacific, and Indian oceans.

Little Ice Age: The Little Ice Age (LIA) was a regional cooling period, mainly affecting the North Atlantic region. It was not a global ice age but had significant impacts. Francois E. Matthes introduced the term in 1939. Generally defined from the 16th to the 19th centuries, it is sometimes referred to as spanning from around 1300 to 1850.

Renaissance: The Renaissance was a historical period and cultural movement in the 15th and 16th centuries. It aimed to revive and surpass classical antiquity, bringing great social change in various fields like art, architecture, literature, exploration, and science. Some argue that the Renaissance was a break from the past, while others see it as an extension of the Middle Ages. The period overlaps with the Late Middle Ages and shows similarities to both eras.

Scientific Revolution: The Scientific Revolution was a transformative period in early modern Europe marked by breakthroughs in mathematics, physics, astronomy, biology, and chemistry. These advancements revolutionized society's understanding of nature. It began with Nicolaus Copernicus' 1543 publication, "De revolutionibus orbium coelestium," which challenged traditional views of the cosmos.

Seven Years' War: The Seven Years' War (1756–1763) was a global conflict involving major European powers in Europe, the Americas, and Asia-Pacific. It included concurrent conflicts like the French and Indian War, Carnatic Wars, and Anglo-Spanish War. Great Britain and France led opposing alliances, vying for global dominance. The war involved extensive land and naval battles, with Prussia seeking territorial expansion and Austria aiming to regain Silesia. In North America and the West Indies, Britain clashed with France and Spain due to colonial rivalries. The war had significant consequences and shaped the balance of power.

Treaty of Tordesillas: The Treaty of Tordesillas was signed in 1494, dividing newly discovered lands between Portugal and the Crown of Castile. The division was made along a meridian line, 370 leagues west of the Cape Verde islands. This line was halfway between the Cape Verde islands and the islands visited by Christopher Columbus on his first voyage, known as Cipangu and Antillia. It aimed to prevent conflicts between Spain and Portugal over their colonial claims.

British Empire: The British Empire was a vast collection of territories ruled by the United Kingdom and its predecessors. It originated from England's overseas possessions and trading posts established in the 16th and 17th centuries. At its height, it was the largest empire ever, holding influence over 412 million people and covering 24% of the Earth's land area. Its power and global dominance lasted for a century, earning it the title of "the empire on which the sun never sets." Today, the influence of the British Empire can still be seen in its constitutional, legal, linguistic, and cultural legacy.

French colonial empire: The French colonial empire referred to the colonies, protectorates, and mandate territories ruled by France from the 16th century onward. It can be divided into two distinct periods: the "First French colonial empire" until 1814, and the "Second French colonial empire" starting in 1830 with the conquest of Algiers. By the beginning of World War I, France's colonial empire was the second-largest globally, comprising roughly one third of the size and twelve per cent of the population of the British Empire.

Portuguese Empire: The Portuguese Empire, also known as the Portuguese Overseas or the Portuguese Colonial Empire, was a long-lasting colonial empire governed by Portugal. It lasted for almost six centuries, from 1415 to 1999, and had colonies, factories, and territories across Africa, the Americas, Asia, and Oceania. It began in the 15th century with the conquest of Ceuta and expanded globally in the 16th century.

Spanish Empire: The Spanish Empire, also called the Hispanic Monarchy or the Catholic Monarchy, was a major colonial empire governed by Spain from 1492 to 1976. Alongside the Portuguese Empire, it initiated the European Age of Discovery and had a global reach, controlling vast territories in the Americas, Africa, Asia, and Oceania. Renowned as "the empire on which the sun never sets," it was one of the most powerful empires of the early modern era and at its peak in the late 1700s-early 1800s, it encompassed over 13 million square kilometers, ranking among the largest empires in history.

Columbian exchange: The Columbian exchange refers to the widespread transfer of plants, animals, diseases, technology, and ideas between the New World and the Old World following Christopher Columbus's 1492 voyage. It greatly impacted both hemispheres, with European colonists and African slaves replacing Indigenous populations in the Americas. Communicable diseases from the Old World led to a significant decrease in Indigenous peoples. The exchange was a mix of purposeful and accidental transfers and led to major cultural and demographic shifts across the globe.

Age of Enlightenment: The Age of Enlightenment was an intellectual movement in Europe during the 17th and 18th centuries. It emphasized the value of human happiness, the pursuit of knowledge through reason and senses, and ideals like natural law, liberty, progress, toleration, constitutional government, and separation of church and state. It had global influences and aimed to advance society's understanding and improve the human condition.

Reformation: The Reformation, a 16th-century movement in Western Christianity, challenged the authority of the Catholic Church and the papacy. It paved the way for Protestantism and coincided with the Renaissance era.

Peace of Westphalia: The Peace of Westphalia, signed in 1648 in Osnabrück and Münster, ended the devastating Thirty Years' War and restored peace to the Holy Roman Empire. It marked the involvement of Holy Roman Emperor Ferdinand III, France, Sweden, and other imperial princes. This historic event concluded a tragic period in European history with an estimated death toll of eight million people.

Thirty Years' War: The Thirty Years' War was a devastating conflict in European history, lasting from 1618 to 1648. It caused widespread destruction and death, with estimates ranging from 4.5 to 8 million casualties. The war mainly took place in Central Europe and led to significant population decline in parts of modern Germany. It was associated with other conflicts such as the Eighty Years' War, the War of the Mantuan Succession, the Franco-Spanish War, the Torstenson War, the Dutch-Portuguese War, and the Portuguese Restoration War.

Counter-Reformation: The Counter-Reformation, or Catholic Revival, was a response to the Protestant Reformations. It started with the Council of Trent (1545–1563) and ended after the European wars of religion (1648). The term Catholic Reformation can also refer to reforms before the Protestant movement or Trent.

1755 Lisbon earthquake: The 1755 Lisbon earthquake, also called the Great Lisbon earthquake, devastated Portugal, the Iberian Peninsula, and Northwest Africa. It occurred on November 1st, with a magnitude of 7.7 or greater. The earthquake, along with subsequent fires and a tsunami, caused widespread destruction, almost completely wiping out Lisbon and nearby areas. The epicenter was located about 200 km west-southwest of Cape St. Vincent in the Atlantic Ocean, and roughly 290 km southwest of Lisbon.

Anglo-Dutch Wars: The Anglo-Dutch Wars were conflicts between the Dutch Republic and England in the 17th and 18th century. These wars primarily revolved around trade, overseas colonies, and were marked by numerous naval battles.

Enclosure: Enclosure is the act of converting common land into privately owned land, thus restricting access for commoners. This could occur through formal or informal agreements. The process involved creating smaller fields for individual owners, enclosing entire parishes through collective ownership, or enacting enclosure laws through Parliament.

Eighty Years' War: The Eighty Years' War, also known as the Dutch Revolt, was a conflict between rebels and the Spanish government in the Habsburg Netherlands. It was sparked by various factors, including the Reformation, centralization, high taxation, and disputes regarding the rights and privileges of Dutch nobility and cities.

English Civil War: The English Civil War was a series of civil wars and political conflicts between Royalists and Parliamentarians in England from 1642 to 1651. It included the First, Second, and Third English Civil Wars, which were part of the broader Wars of the Three Kingdoms from 1639 to 1653. The Third Civil War is also called the Anglo-Scottish war.

French Revolution: The French Revolution (1789-1799) was a transformative period in France marked by political and societal change. It began with the Estates General and ended with the coup of 18 Brumaire and the French Consulate. It introduced fundamental principles of liberal democracy and its values and institutions continue to shape modern French politics.

French Revolutionary Wars: The French Revolutionary Wars (1792-1802) were a series of global military conflicts resulting from the French Revolution. They pitted France against Britain, Austria, Prussia, Russia, and other monarchies, consisting of the War of the First Coalition (1792-1797) and War of the Second Coalition (1798-1802). Gradually expanding beyond Europe, France successfully conquered territories in the Italian Peninsula, the Low Countries, and the Rhineland, spreading revolutionary principles throughout much of Europe.

French Wars of Religion: The French Wars of Religion (1562-1598) were a series of brutal civil wars between French Catholics and Protestants, resulting in between 2 and 4 million deaths. The conflict weakened the French monarchy significantly. The infamous St. Bartholomew's Day massacre in 1572 was a major incident during this period. The wars concluded with a compromise in 1598, when Henry of Navarre became King Henry IV of France and issued the Edict of Nantes, granting rights to Protestants. However, Catholic opposition and Henry's assassination in 1610 sparked further Huguenot rebellions in the 1620s.

Huguenots: Huguenots were French Protestants who followed the Reformed tradition of Protestantism. Their name comes from a Swiss leader named Besançon Hugues. The term was commonly used from the 16th century. Huguenots referred specifically to Reformed Church members in France, while Lutherans were more prominent in Eastern France.

Italian Wars: The Italian Wars were a series of conflicts fought between 1494 and 1559 across Italy, Flanders, the Rhineland, and the Mediterranean Sea. The main belligerents were the French Valois kings, the Habsburgs from the Holy Roman Empire and Spain. Multiple Italian states were involved, some on both sides, with limited participation from England and the Ottoman Empire.

Prussia: Prussia was a German state that existed from 1701 to 1947. It played a significant role in shaping German history and was ruled by the House of Hohenzollern. With its capital in Königsberg and later Berlin, Prussia expanded its territory through the Prussian Army. It united the German states to form the German Empire in 1871. Prussia's power was dissolved in 1932 and officially ended in 1947 through decrees.

Puritans: The Puritans were 16th and 17th century English Protestants who aimed to eliminate Roman Catholic practices from the Church of England. They believed the church still needed further reformation and should embrace Protestant ideals. Puritanism had a major impact on English and early American history, particularly during the Protectorate.

Spanish Inquisition: The Spanish Inquisition, established in 1478 by King Ferdinand II and Queen Isabella I, aimed to maintain Catholic orthodoxy in Spain and its colonies. It replaced the Medieval Inquisition and was the most significant among the Catholic Inquisitions. Operating in Spain and its territories, it prosecuted around 150,000 people over three centuries, with 3,000 to 5,000 executions. However, the Inquisition didn't have jurisdiction over indigenous people, focusing on old Christians and their descendants as directed by the King of Spain.

War of the Austrian Succession: The War of the Austrian Succession, lasting from 1740 to 1748, was a European conflict. It primarily took place in Central Europe, the Austrian Netherlands, Italy, the Atlantic Ocean, and Mediterranean Sea. It is associated with wars like King George's War, the War of Jenkins' Ear, the First Carnatic War, and the First and Second Silesian Wars.

War of the Spanish Succession: The War of the Spanish Succession was a European conflict from 1701 to 1714. It was triggered by the death of Charles II of Spain, causing a power struggle over control of the Spanish Empire. The main contenders were Philip of Anjou, supported by France and Spain, and Archduke Charles of Austria, backed by the Holy Roman Empire, the Dutch Republic, and Great Britain. Notable related conflicts included the Great Northern War and Queen Anne's War in North America.

Cossacks: The Cossacks are predominantly East Slavic Orthodox Christian people from eastern Ukraine and southern Russia. They were semi-nomadic and semi-militarized, granted self-governance in exchange for military service. Most Cossacks were East Slavic-speaking Orthodox Christians. They had special privileges from Polish-Lithuanian Commonwealth and Russian Empire in return for military duty. Cossacks were organized into large autonomous groups called hosts, with territories consisting of affiliated villages called stanitsas.

Cossack Hetmanate: The Cossack Hetmanate, also known as Zaporozhian Host, was a Ukrainian Cossack state in central Ukraine from 1649 to 1764. Its administrative system lasted until 1782.

Crimean Khanate: The Crimean Khanate was a Crimean Tatar state that existed from 1441 to 1783. It was considered the longest-lasting Turkic khanate after the Golden Horde. Established by Hacı I Giray, it claimed to be the direct successor of the Golden Horde and Desht-i-Kipchak. In European historiography, it was known as Little Tartary.

Great Northern War: The Great Northern War (1700-1721) was a conflict between Russia and Sweden over control of Northern, Central, and Eastern Europe. The Russian-led coalition, including Denmark-Norway and Saxony-Poland-Lithuania, initially suffered defeats but regained strength after the Battle of Poltava. The alliance later expanded to include Great Britain, Hanover, and Brandenburg-Prussia.

Great Turkish War: The Great Turkish War, known as the Wars of the Holy League, was a series of conflicts between the Ottoman Empire and the Holy League comprising the Holy Roman Empire, Poland-Lithuania, Venice, Russia, and the Kingdom of Hungary. Lasting from 1683 to 1699, the Ottoman Empire suffered a major defeat, losing substantial territories in Hungary, the Polish-Lithuanian Commonwealth, and parts of the western Balkans. Notably, this war marked Russia's first alliance with Western Europe. It concluded with the signing of the Treaty of Karlowitz.

Battle of Vienna: The Battle of Vienna occurred on 12 September 1683 near the city after a two-month Ottoman siege. It involved the Holy Roman Empire and the Polish-Lithuanian Commonwealth, led by King John III Sobieski, against the Ottomans and their vassal states. This was the first joint military effort between the Commonwealth and Holy Roman Empire against the Ottomans and resulted in a significant defeat for the Ottomans. The battle is considered a turning point in halting Ottoman expansion into Europe, with no further territorial gains. As a result of the subsequent war, the Ottomans conceded most of Ottoman Hungary to the Holy Roman Emperor Leopold I.

House of Romanov: The House of Romanov was the ruling family in Russia from 1613 until 1917. They gained power through Anastasia Romanovna's marriage to Ivan the Terrible, the first tsar of Russia. In 1918, Nicholas II and his family were executed, but there are still living Romanov descendants today.

Khanate of Kazan: The Khanate of Kazan was a Tatar Turkic state in medieval times from 1438 to 1552. It encompassed lands of former Volga Bulgaria, including present-day Tatarstan, Mari El, Chuvashia, Mordovia, Udmurtia, and Bashkortostan. Kazan served as its capital. As a successor state of the Golden Horde, the khanate was conquered by the Tsardom of Russia, leading to its demise.

Polish–Lithuanian Commonwealth: The Polish–Lithuanian Commonwealth was a bi-confederal state in Europe, ruled by a common monarch, who was both King of Poland and Grand Duke of Lithuania. It was known for its large territory and population, covering almost 1 million km2 and 12 million people in the 16th-17th centuries. The official languages were Polish and Latin.

Partitions of Poland: The Partitions of Poland were three territorial divisions of the Polish-Lithuanian Commonwealth in the late 18th century. Conducted by the Habsburg monarchy, Prussia, and the Russian Empire, these partitions eliminated the sovereign states of Poland and Lithuania for 123 years. The Commonwealth lands were progressively seized and annexed by the three powers, marking the end of the Polish-Lithuanian state.

Livonian War: The Livonian War (1558–1583) was a conflict over Old Livonia. Russia faced a coalition consisting of Denmark-Norway, Sweden, Lithuania, and Poland.

Muscovite–Lithuanian Wars: The Muscovite-Lithuanian Wars were a series of conflicts between the Grand Duchy of Lithuania (allied with the Kingdom of Poland) and the Grand Duchy of Moscow. The Lithuanians suffered defeats from Ivan III and Vasily III, prompting reliance on Polish aid. Eventually, this alliance led to the creation of the Polish-Lithuanian Commonwealth. The wars resulted in the Muscovites expanding westwards, gaining control over multiple principalities.

Ottoman wars in Europe: The Ottoman wars in Europe were a series of conflicts between the Ottoman Empire and various European states that occurred from the Late Middle Ages to the early 20th century. Starting with the Byzantine-Ottoman wars, the conflicts spread into Europe in the 14th century with the Bulgarian and Serbian-Ottoman wars. Ottoman expansion into the Balkans was a prominent feature, and their territory in Europe reached its peak in the 15th and 16th centuries.

Cretan War (1645–1669): The Cretan War (1645–1669) was a conflict between Venice and the Ottoman Empire and their allies, fought primarily over the island of Crete. Lasting for 24 years, the war centered around the city of Candia and saw numerous naval skirmishes across the Aegean Sea. Additionally, Dalmatia served as a secondary battleground.

Polish–Muscovite War (1605–1618): The Polish-Muscovite War, also called the Polish-Russian War or the Dimitriads, took place from 1605 to 1618. It was a conflict between the Tsardom of Russia and the Polish-Lithuanian Commonwealth, supported by the Zaporozhian Cossacks.

Tsardom of Russia: The Tsardom of Russia, or Tsardom of Muscovy, was a centralized Russian state from 1547 to 1721. It began when Ivan IV became the first tsar and ended with the establishment of the Russian Empire by Peter the Great.

American Revolution: The American Revolution was an ideological and political revolution in British America in the late 18th century. It led to the American Revolutionary War, where the Thirteen Colonies gained independence from Britain and established the United States as the first nation based on Enlightenment principles of consent of the governed, constitutionalism, and liberal democracy.

American Revolutionary War: The American Revolutionary War, also called the Revolutionary War or American War of Independence, was a military conflict during the American Revolution. American Patriots, led by George Washington, defeated the British, resulting in the Treaty of Paris in 1783, which recognized US independence. The war took place in North America, the Caribbean, and the Atlantic. France, Spain, and German Hessian soldiers supported both sides.

European colonization of the Americas: European colonization of the Americas took place between the late 15th century and early 19th century. While the Norse had explored and briefly settled the region earlier, the colonization by European powers in North and South America is more well-known due to its long duration and significance during the Age of Discovery.

British colonization of the Americas: The British colonization of the Americas refers to England and Scotland's establishment of control, settlement, and colonization in the Americas, later continued by Great Britain. Starting in the late 16th century, England made unsuccessful attempts to establish permanent colonies in the North. The first successful English colony was Jamestown, Virginia, founded in 1607, where around 30,000 Algonquian people resided. British colonies were established in North America, Central America, South America, and the Caribbean. While most colonies gained independence, some remain British Overseas Territories.

Spanish colonization of the Americas: The Spanish colonization of the Americas started in 1493 on Hispaniola after Columbus' voyage. These territories were governed by the Crown of Castile until 1898. Spaniards saw indigenous populations as an economic resource. Religion was crucial in incorporating indigenous peoples into the Catholic Church. The crown established structures to govern the vast territory. Spanish colonists settled where there were dense indigenous populations and valuable resources.

Spanish conquest of the Aztec Empire: The Spanish conquest of the Aztec Empire was a pivotal event in the colonization of the Americas. It involved Spanish conquerors, indigenous allies, and enemies of the Aztecs who joined forces to defeat the Mexica of Tenochtitlan over two years (1519-1521). This coalition marked the end of the Aztec Empire and was part of Spain's larger project of colonizing the New World, following several decades of Spanish settlement and exploration in the Caribbean.

Spanish conquest of the Inca Empire: The Spanish conquest of the Inca Empire, or Conquest of Peru, was a major campaign in the Spanish colonization of the Americas. In 1532, Spanish soldiers led by Francisco Pizarro captured the Inca leader Atahualpa, marking the beginning of a lengthy conflict. The conquest ended in Spanish victory in 1572, leading to the colonization of the region as the Viceroyalty of Peru. This conquest also sparked expeditions into present-day Chile, Colombia, and the Amazon Basin.

French and Indian War: The French and Indian War (1754–1763) was part of the Seven Years' War. It involved the British colonies in North America against the French, with support from Native American tribes. The British had a significant population advantage. The French heavily relied on their Native American allies.

Haitian Revolution: The Haitian Revolution was a successful uprising by slaves against French colonial rule in Saint-Domingue (now Haiti). It lasted from 1791 to 1804 and resulted in the independence of Haiti. Participants included black, biracial, and European individuals, led by Toussaint Louverture. It was the only slave rebellion to establish a non-white-led state free from slavery. The revolution had a profound impact on the Atlantic World, inspiring anti-slavery movements across the Americas. After achieving independence, the former slaves defended their freedoms with the help of free people of color.

Slavery in Africa: Slavery in Africa has been widespread throughout history. This system of servitude was common in ancient times, similar to other parts of the world. With the arrival of trans-Saharan, Indian Ocean, and Atlantic slave trades, local African slave systems started providing captives for external slave markets. Remarkably, contemporary Africa still witnesses the illegal practice of slavery.

Atlantic slave trade: The Atlantic slave trade was the transportation of enslaved African people by slave traders to the Americas from the 16th to the 19th centuries. European slave ships used the triangular trade route and Middle Passage. Enslaved Africans, sold by West African slave traders, were gathered at forts on the African coast and brought to the Americas by Portuguese, British, Spanish, Dutch, and French slave traders. Europeans generally did not participate in raids in Africa due to low life expectancy.

Ashanti Empire: The Ashanti Empire, also known as the Asante Empire, was an Akan state that existed from 1701 to 1901 in modern-day Ghana. It extended from the Ashanti Region to encompass most of Ghana, parts of Ivory Coast, and Togo. Known for its military power, wealth, impressive architecture, hierarchical society, and rich culture, the Ashanti Empire has been extensively researched by European, primarily British, authors, making it one of the most documented indigenous cultures in sub-Saharan Africa.

Hausa Kingdoms: The Hausa Kingdoms, also called Hausa Kingdom or Hausaland, were a group of states established by the Hausa people in the region between the Niger River and Lake Chad. This region emerged as a political and cultural area in the first millennium CE due to the westward migration of the Hausa people. They settled in Hausaland as the landscape transitioned from woodlands to savannah, and developed a thriving society with a common language, laws, and customs. The Hausa were skilled in fishing, hunting, agriculture, salt-mining, and blacksmithing, contributing to their economic and cultural prosperity.

Funj Sultanate: The Funj Sultanate, also called Funjistan or Sultanate of Sennar, was a monarchy in present-day Sudan, northwestern Eritrea, and western Ethiopia. Founded by the Funj people in 1504, it embraced Islam, albeit in name only. The state flourished in the late 17th century before declining and eventually disintegrating in the 18th and 19th centuries. In 1821, the weakened sultan surrendered to the Ottoman Egyptian invasion without resistance.

Kingdom of Kongo: The Kingdom of Kongo was a central African kingdom that existed in present-day northern Angola, the western Democratic Republic of the Congo, Gabon, and the Republic of the Congo. It stretched from the Atlantic Ocean to the Kwango River and from the Congo River to the Kwanza River. Ruled by the Manikongo, it had influence over neighboring kingdoms.

Kingdom of Mutapa: The Kingdom of Mutapa, also known as the Mutapa Empire or Mwenemutapa, was an African kingdom that existed in Zimbabwe and later expanded into modern-day Mozambique.

Oyo Empire: The Oyo Empire was a powerful Yoruba empire in present-day southern Benin and western Nigeria. It became the largest Yoruba-speaking state through the efforts of the Yoruba people, trade, and military cavalry. From the mid-17th to late 18th century, it was politically significant in West Africa, ruling over other Yoruba kingdoms and nearby African states, including Dahomey in Benin.

Western imperialism in Asia: Western imperialism in Asia refers to the dominance and control exerted by Western European powers and associated states over Asian territories during the colonial period, starting in the 16th century. This influence peaked during the Age of Sail, bringing about colonization, the introduction of modern warfare, and the expansion of the spice trade. European-style colonial empires operated in Asia for six centuries until the Portuguese Empire's last colony, Macau, gained independence in 1999. This imperialism introduced Western concepts of nation and the multinational state, shaping the development of the Western concept of the nation state.

Dutch East India Company: The Dutch East India Company, established in 1602, was the world's first joint-stock company, with a 21-year monopoly for trade in Asia. It allowed residents of the United Provinces to buy and sell shares in open-air markets. Considered the first multinational corporation, it possessed extensive powers such as waging war, imprisoning and executing convicts, negotiating treaties, minting coins, and establishing colonies.

East India Company: The East India Company (EIC) was an influential English/British joint-stock company from 1600 to 1874. It traded in the Indian Ocean region and gradually expanded to the East Indies and East Asia. It controlled significant portions of India, colonized Southeast Asia and Hong Kong. At its height, it was the world's largest corporation, boasting a massive army of around 260,000 soldiers, twice the size of the British army.

Dzungar Khanate: The Dzungar Khanate was an Inner Asian khanate of Oirat Mongol origin. It covered a vast territory from southern Siberia to present-day Kyrgyzstan and from the Great Wall of China to present-day Kazakhstan. Its core area is now part of northern Xinjiang, known as Dzungaria.

Kazakh Khanate: The Kazakh Khanate was a Central Asian state that existed from the 15th to the 19th century. It succeeded the Golden Horde and was centered in the eastern parts of the Desht-i Qipchaq. It was also known as Ulus of the Kazakhs, Ulus of Jochi, and Yurt of Urus in various sources.

Khanate of Bukhara: The Khanate of Bukhara was a powerful Uzbek state in Central Asia, existing from 1501 to 1785. It was founded by the Abu'l-Khayrid dynasty and briefly had Bukhara as its capital from 1533 to 1540. The Khanate experienced its height of influence and territorial expansion under ruler Abdullah Khan II, known for his scholarly pursuits.

Khanate of Sibir: The Khanate of Sibir was a Tatar Khanate in western Siberia, founded in the late 15th century after the Golden Horde's breakup. It was contested between the Shaybanid and Taibugid dynasties, both descended from Genghis Khan. The Khanate's territory was once part of the Mongol Empire and later controlled by the White Horde and Golden Horde.

Safavid dynasty: The Safavid dynasty, ruling from 1501 to 1736, was an influential Iranian ruling dynasty that marked the beginning of modern Iranian history. They established the Twelver denomination of Shīʿa Islam as the official religion of the Persian Empire, transforming the course of Islam. Originating from the Safavid order of Sufism in Ardabil, they married into diverse ethnic groups, yet maintained their Turkic-speaking identity. With their base in Ardabil, they gained control over parts of Greater Iran, reviving the Iranian identity and establishing a national state known as Iran, succeeding the Sasanian Empire.

1556 Shaanxi earthquake: The 1556 Shaanxi earthquake, also called the Jiajing Great Earthquake or Hua County Earthquake, happened on January 23, 1556 in Huaxian, Shaanxi in China. It occurred during the Ming dynasty and is one of the most devastating earthquakes in history.

Ayutthaya Kingdom: The Ayutthaya Kingdom, also known as the Empire of Ayutthaya, was a powerful Siamese kingdom in Southeast Asia from 1351 to 1767. It was centered around Ayutthaya, the capital city of Siam (now Thailand). European travellers recognized Ayutthaya as one of the three major Asian powers in the early 16th century. Considered a precursor of modern Thailand, the Ayutthaya Kingdom's historical developments hold significant importance in Thai history.

Edo period: The Edo period (1603-1868) in Japan was under the rule of the Tokugawa shogunate and regional daimyo. It brought economic growth, social order, isolationist policies, stability, peace, and flourishing arts and culture. Also known as Ōedo.

Tokugawa shogunate: The Tokugawa shogunate was the military rule in Japan from 1603 to 1868, known as the Edo period. It was a time of peace and stability, with the ruling Tokugawa family based in Edo (now Tokyo). The shogunate exercised centralized authority, isolated Japan from the rest of the world, and imposed strict social order through a rigid caste system. It promoted economic growth through agricultural reforms, urbanization, and fostering of arts and culture. The shogunate's power declined due to internal conflicts and pressure from Western powers, leading to the Meiji Restoration in 1868.

Joseon: Joseon, the last dynasty of Korea, existed for over 500 years from 1392 to 1897. Founded by Yi Seong-gye, it replaced the Goryeo dynasty. The kingdom was renamed and its capital was moved to Seoul. Its territory expanded northward through the subjugation of the Jurchens, reaching the natural borders of the Amrok and Tuman rivers.

Lan Xang: Lan Xang, also known as Lancang, was a major Lao kingdom lasting from 1353 to 1707. It encompassed present-day Laos and emerged as one of Southeast Asia's prominent kingdoms for over 350 years. Lan Xang's influence continues to shape Laos's national heritage, symbolizing its historical and cultural identity.

Lê dynasty: The Lê dynasty, also known as Later Lê, was the longest-ruling Vietnamese dynasty from 1428 to 1789. It was divided into two periods: the Innitial Lê dynasty and the Revival Lê dynasty. The Revival Lê dynasty experienced two major civil wars: the Lê–Mạc War (1533–1592) and the Trịnh–Nguyễn Wars.

Ming dynasty: The Ming dynasty was an imperial dynasty in China (1368-1644) ruled by the Han Chinese people. It followed the collapse of the Yuan dynasty and was the last imperial dynasty of China. Despite the fall of Beijing in 1644, remnants of the Ming imperial family formed various Southern Ming regimes that survived until 1662.

Qing dynasty: The Qing dynasty was the last imperial dynasty in China, led by the Manchus. It started in 1636 and ended in 1912. After seizing Beijing in 1644, it expanded its rule over all of China and Taiwan, and later into Inner Asia. The dynasty was overthrown in the Xinhai Revolution. Preceded by the Ming dynasty and succeeded by the Republic of China, the Qing dynasty played a vital role in shaping modern China, being the largest empire in Chinese history. With a population of 419,264,000 in 1907, it was also the most populous country at that time.

Japanese invasions of Korea (1592–1598): The Japanese invasions of Korea (1592–1598), also known as the Imjin War, consisted of two invasions with a brief truce in between. The conflict ended in 1598 with the withdrawal of Japanese forces from Korea after a military stalemate in the southern provinces.

Sino-Burmese War: The Sino-Burmese War, also known as the Qing invasions of Burma, was a conflict between the Qing dynasty of China and the Konbaung dynasty of Burma. China conducted four invasions of Burma from 1765 to 1769, resulting in the death of over 70,000 Chinese soldiers. However, the war is considered a disaster for the Qing dynasty, leading to Burmese independence and setting the boundary between the two nations that exists today.

Toungoo dynasty: The Toungoo dynasty, also known as the Restored Toungoo dynasty, was the ruling dynasty of Burma (Myanmar) from the mid-16th century to 1752. Under the leadership of Tabinshwehti and Bayinnaung, it successfully reunited the territories of the Pagan Kingdom and incorporated the Shan States, Manipur, Chinese Shan States, Siam, and Lan Xang. The Toungoo Empire reached its peak as the largest and strongest empire in Southeast Asia but collapsed after Bayinnaung's death in 1581.

Great Bengal famine of 1770: The Great Bengal famine of 1770 was a devastating famine that affected Bengal and Bihar, impacting around 30 million people. It occurred during a period of dual governance, where the East India Company held the right to collect revenue but did not have control over civil administration. The famine occurred due to a combination of poor governance and natural factors, resulting in widespread hunger and loss of life.

Deccan sultanates: The Deccan Sultanates were five independent Muslim kingdoms on the Deccan Plateau in India. They were Ahmadnagar, Berar, Bidar, Bijapur, and Golconda. These sultanates emerged after the Bahmani Sultanate dissolved. Ahmadnagar declared independence in 1490, followed by Bijapur and Berar in the same year. Golconda became independent in 1518, and Bidar in 1528.

Maratha Empire: The Maratha Empire, also called the Maratha Confederacy, was a powerful Indian empire in the 18th century. It emerged in 1674 when Shivaji, a Maratha ruler, was crowned as the Chhatrapati. The empire included warriors, administrators, and nobles from various castes in Maharashtra. The Maratha Kingdom eventually grew into a vast empire under Peshwa Bajirao I's leadership.

Mughal Empire: The Mughal Empire was an influential empire in South Asia that reached its height from the Indus River to Afghanistan, Kashmir, Assam, and Bangladesh. It also extended to the Deccan Plateau in South India.

Sikh Empire: The Sikh Empire was a powerful regional force in the Punjab region of the Indian subcontinent from 1799 to 1849. It was established by Maharaja Ranjit Singh after capturing Lahore and was ultimately conquered by the British East India Company in the Second Anglo-Sikh War. The empire was built on the Khalsa foundation and consisted of autonomous misls. At its height, it spanned from Gilgit and Tibet in the north to the deserts of Sindh in the south and from the Khyber Pass in the west to the Sutlej River in the east. The empire was divided into four provinces: Lahore, Multan, Peshawar, and Kashmir. With a diverse population of around 4.5 million, it was the final major region of the Indian subcontinent to be annexed by the British Empire.

Abolitionism: Abolitionism is a global movement to end slavery and emancipate enslaved people.

Great Depression: The Great Depression (1929–1939) was a severe global economic downturn caused by a sharp decline in US stock prices. It led to the Wall Street crash in October 1929, triggering a period of economic depression. This prolonged crisis was characterized by high unemployment rates and widespread business failures, affecting many countries worldwide.

Industrial Revolution: The Industrial Revolution was a global transition from manual labor to machine-based manufacturing that took place from around 1760 to 1820-1840. It began in Great Britain, spreading to Europe and the United States. This period saw advancements in manufacturing processes, such as the use of machines, new chemical and iron production techniques, as well as the rise of water and steam power. It also led to the development of machine tools and the mechanized factory system. The population grew rapidly as output increased, and the textile industry became dominant.

Late modern period: The late modern period, starting in 1800, followed the early modern period. It either ended in 1945 or continues to the present. Key features include its position after the early modern period and its connection to contemporary history.

New Imperialism: New Imperialism was a historical period of colonial expansion by European powers, the United States, and Japan in the late 19th and early 20th centuries. It involved the pursuit of overseas territories, conquest, and resource exploitation. The era witnessed the conquest of Africa and parts of Asia by European powers, driven by rivalries, economic motives, and a desire for a "civilizing mission." Many colonies established during this period gained independence after World War II.

Spanish flu: The Spanish flu, officially known as the 1918–1920 flu pandemic, was a highly lethal global influenza outbreak caused by the H1N1 influenza A virus. It started in Kansas, United States in March 1918 and quickly spread to France, Germany, and the United Kingdom. Within two years, around one-third of the world population, estimated at 500 million people, had been infected in four waves. The death toll ranges from 17 to 100 million, positioning the Spanish flu as one of the deadliest pandemics in history.

World War I: World War I, also known as the First World War, was a global conflict between the Allies and the Central Powers. It occurred in Europe, the Middle East, Africa, the Pacific, and parts of Asia. This deadly war resulted in approximately 9 million soldiers dead and 23 million wounded, along with 5 million civilian deaths from various causes. It also played a major role in the 1918 Spanish flu pandemic and led to widespread genocide.

Assassination of Archduke Franz Ferdinand: The assassination of Archduke Franz Ferdinand was a significant event that triggered World War I. On June 28, 1914, the heir to the Austro-Hungarian throne and his wife were killed in Sarajevo by Bosnian Serb student Gavrilo Princip. This act took place in Sarajevo, Bosnia-Herzegovina, which had been annexed by Austria-Hungary in 1908.

Balfour Declaration: The Balfour Declaration was a 1917 public statement by the British Government during WWI, expressing support for creating a "national home for the Jewish people" in Palestine. It was made in a letter from Foreign Secretary Arthur Balfour to Lord Rothschild, a leader of the British Jewish community, and published in the press on November 9th.

Balkans theatre: The Balkans theatre refers to the World War I battleground between the Central Powers and the Allies.

Eastern Front (World War I): The Eastern Front in World War I was a theater of operations stretching from Russia to Romania, involving Austria-Hungary, Bulgaria, the Ottoman Empire, and Germany. It covered most of Eastern Europe and extended into Central Europe. This contrasts with the Western Front in Belgium and France.

Italian front (World War I): The Italian front in World War I was a major battleground in Northern Italy from 1915 to 1918. The Kingdom of Italy joined the Allies, hoping to gain territory from the Austrians.

Middle Eastern theatre of World War I: The Middle Eastern theatre of World War I occurred from 30 October 1914 to 30 October 1918. The main combatants were the Ottoman Empire and the British, with support from other Central Powers and Allied Powers respectively. The major campaigns included Sinai and Palestine, Mesopotamia, Caucasus, Persian, and Gallipoli.

Treaty of Versailles: The Treaty of Versailles, signed in 1919, ended World War I and the state of war between Germany and most of the Allied Powers. It was signed in the Palace of Versailles, five years after the assassination of Archduke Franz Ferdinand. The United States did not ratify the treaty and made a separate peace agreement with Germany. The negotiations took six months at the Paris Peace Conference, while Germany was not allowed to participate and was forced to sign the final treaty.

Western Front (World War I): The Western Front was a major battleground in World War I. The German Army invaded Luxembourg, Belgium, and gained control of important industrial areas in France. The Battle of the Marne halted the German advance. Both sides then dug trenches along a fortified line from the North Sea to Switzerland, with little change except in 1917 and 1918.

World War II: World War II was a global conflict from 1939-1945. All major countries were involved, forming the Allies and Axis alliances. It was a total war with intense investment in economic and military resources. Aircraft played a significant role, leading to strategic bombings and nuclear weapon use. With 70-85 million fatalities, it was the deadliest conflict, involving genocides, starvation, massacres, and disease. Germany, Austria, and Japan were occupied, and war crime trials were held against their leaders.

Battle of Britain: The Battle of Britain was a military campaign during World War II. It saw the RAF and Royal Navy defending the UK against large-scale attacks by the Luftwaffe. It was the first major air battle of the war and lasted from July to October 1940, overlapping with the Blitz. The British recognize the battle's duration as July to October 1940, while German historians view it as July 1940 to May 1941, incorporating the Blitz.

Atomic bombings of Hiroshima and Nagasaki: The atomic bombings of Hiroshima and Nagasaki were the only uses of nuclear weapons in an armed conflict. The bombings killed between 129,000 and 226,000 civilians. Japan surrendered to the Allies after the bombings and the Soviet Union's declaration of war. The instrument of surrender was signed on 2 September, effectively ending the war.

Attack on Pearl Harbor: The surprise military strike by the Imperial Japanese Navy Air Service on the American naval base at Pearl Harbor brought the United States into World War II. It occurred on December 7, 1941, leading to the U.S. formally joining the Allies.

Battle of the Atlantic: The Battle of the Atlantic, a crucial part of naval history in World War II, lasted from 1939 to 1945. It involved the Allied naval blockade of Germany and Germany's counter-blockade. The campaign reached its peak from mid-1940 to the end of 1943.

Eastern Front (World War II): The Eastern Front in WWII was a battleground between Axis powers and Allies including the USSR and Poland. It took place in Central, Eastern, Northeast, and Southeast Europe from 1941 to 1945. The Eastern Front saw around 30 million deaths, including 9 million children. Ultimately, the front played a crucial role in defeating Nazi Germany and the Axis nations.

The Holocaust: The Holocaust was the genocide of six million European Jews during World War II. Nazi Germany and collaborators systematically murdered two-thirds of Europe's Jewish population between 1941 and 1945. The killings occurred through mass shootings and poison gas in camps like Auschwitz, Treblinka, Belzec, Sobibor, and Chełmno in occupied Poland.

Nazi concentration camps: Nazi concentration camps were numerous during 1933-1945, encompassing over a thousand camps across Nazi Germany and occupied Europe.

Mediterranean and Middle East theatre of World War II: The Mediterranean and Middle East theatre of World War II involved naval, land, and air campaigns fought across the Mediterranean, North Africa, the Horn of Africa, the Middle East, and Southern Europe. It lasted from 1940 to 1945, with Italy joining the war on Germany's side and all Axis forces in Italy surrendering in 1945. The fighting spilled over into Greece during the early stages of the Greek Civil War.

Pacific War: The Pacific War, also known as the Asia-Pacific War, was the largest theater of World War II. It covered eastern Asia, the Pacific Ocean, the Indian Ocean, and Oceania. It included major conflicts such as the Second Sino-Japanese War and the Soviet-Japanese War.

Western Front (World War II): The Western Front in World War II included Denmark, Norway, Luxembourg, Belgium, the Netherlands, the United Kingdom, France, and Germany. It had two phases - the first involved the defeat and capitulation of Luxembourg, Netherlands, Belgium, and France, leading to an air war between Germany and Britain; the second involved the Allied landings in Normandy and the subsequent ground combat leading to Germany's defeat. Italy was considered a separate but related theater.

Yalta Conference: The Yalta Conference was a meeting in February 1945 where the leaders of the US, UK, and USSR discussed the future of Germany and Europe after World War II. President Roosevelt, Prime Minister Churchill, and General Secretary Stalin represented their respective countries. The conference took place near Yalta in Crimea, Soviet Union, in three palaces.

Austrian Empire: The Austrian Empire, also known as the Empire of Austria, was a major European power from 1804 to 1867. It was formed by the Habsburgs and became the third most populous monarchy in Europe. As one of the leading powers in the German Confederation, it was geographically the third-largest empire in Europe.

Austria-Hungary: Austria-Hungary, also known as the Austro-Hungarian Empire or Dual Monarchy, was a constitutional monarchy in Central Europe from 1867 to 1918. It united two sovereign states under one ruler who held the titles of emperor of Austria and King of Hungary. Formed after the Austro-Prussian War, it marked the final stage in the Habsburg monarchy's constitutional development. However, Hungary ended the union with Austria in 1918, leading to its dissolution.

Balkan Wars: The Balkan Wars were two conflicts in 1912 and 1913 in the Balkan states. In the First Balkan War, Greece, Serbia, Montenegro, and Bulgaria defeated the Ottoman Empire and took over its European provinces. In the Second Balkan War, Bulgaria fought against the original combatants and faced an attack from Romania. The Ottoman Empire lost most of its European territory, and Austria-Hungary became weaker as Serbia sought union of the South Slavic peoples. These wars set the stage for the July crisis of 1914, which led to the First World War.

Congress of Berlin: The Congress of Berlin was a diplomatic meeting in 1878 to reorganize states in the Balkan Peninsula after the Russo-Turkish War. Six great powers of Europe, the Ottomans, and four Balkan states were represented. The meeting resulted in the signing of the Treaty of Berlin, replacing a previous treaty.

Crimean War: The Crimean War was fought from 1853 to 1856 between the Russian Empire and an alliance of the Ottoman Empire, France, the United Kingdom, and Sardinia-Piedmont. It resulted in the victory of the alliance.

Dreyfus affair: The Dreyfus affair was a political scandal in France from 1894 to 1906. It symbolizes modern injustice and antisemitism and is a famous example of a miscarriage of justice. Media played a crucial role in shaping public opinion.

Franco-Prussian War: The Franco-Prussian War (1870-1871) was a conflict between France and the German Confederation led by Prussia. It arose from France's desire to maintain its dominant position in Europe after Prussia's victory over Austria in 1866. Historians debate whether Prussian chancellor Bismarck purposely provoked France's declaration of war, or simply took advantage of the situation. However, they agree that Bismarck aimed to form new German alliances.

German Confederation: The German Confederation was a grouping of 39 German-speaking states in Central Europe, established in 1815 after the dissolution of the Holy Roman Empire. It replaced the former empire and was formed through the Congress of Vienna.

German Empire: The German Empire, known as Imperial Germany, was a period in German history from 1871 to 1918. It started with the unification of Germany and ended with the November Revolution. It transitioned from a monarchy to a republic during this time.

Great Famine (Ireland): The Great Famine, also known as the Irish Potato Famine, was a devastating period of starvation and disease in Ireland from 1845 to 1852. It had a profound impact on Irish society and history, leading to a major population decline and mass emigration. Over a million people died, and another million fled the country, reducing the population by 20-25%. The worst year was 1847, known as "Black '47". This famine primarily affected the western and southern regions of Ireland, where Irish was the dominant language. The event is referred to as "an Drochshaol" in Irish, meaning "the bad life" or "the hard times". It resulted in one of the largest mass departures from a single island in history, with at least 2.1 million people leaving Ireland between 1845 and 1855 on various types of ships.

Great Purge: The Great Purge, also known as the Great Terror, was Stalin's campaign to consolidate power by imprisoning and executing rivals. It aimed to eliminate Trotsky's influence and took place from 1936 to 1938. Show trials were a major feature, and the purges affected a significant portion of the population.

Greek War of Independence: The Greek War of Independence, also known as the Greek Revolution, was a successful war fought by Greek revolutionaries against the Ottoman Empire from 1821 to 1829. With assistance from the British Empire, Kingdom of France, and the Russian Empire, the Greeks gained independence. The war resulted in the establishment of modern Greece, celebrated as Independence Day on 25 March annually.

Gulag: The Gulag was a system of forced labor camps in the Soviet Union, primarily operated by the secret police from the 1930s to the early 1950s under Joseph Stalin. Although originally referring to the division in charge, it is commonly used to describe the broader forced labor system throughout the Soviet era. The abbreviation GULAG stands for "Гла́вное Управле́ние исправи́тельно-трудовы́х ЛАГере́й", with the agency's full official name changing several times.

Unification of Italy: The unification of Italy, also called the Risorgimento, was a 19th-century political and social movement that combined various states in the Italian Peninsula and isles into one country, the Kingdom of Italy, by 1861. It was influenced by uprisings against the Congress of Vienna outcome in the 1820s and 1830s, while the Revolutions of 1848 accelerated the unification process. It was finally achieved in 1871 after the capture of Rome and its establishment as the capital of the Kingdom.

July Revolution: The July Revolution, also called the French Revolution of 1830 or Second French Revolution, resulted in the removal of King Charles X and the rise of Louis Philippe as the new monarch. It marked a significant change in power and ended an 18-year reign of Louis Philippe before he was ousted in the 1848 French Revolution.

Napoleonic Wars: The Napoleonic Wars were a series of conflicts between the First French Empire under Napoleon and various European coalitions from 1803 to 1815. These wars arose from political forces stemming from the French Revolution and Revolutionary Wars and resulted in a period of French dominance over Continental Europe.

Congress of Vienna: The Congress of Vienna was a series of diplomatic meetings from 1814-1815. It aimed to establish a new political and constitutional order in Europe following Napoleon's downfall. Representatives from all European powers participated, led by Austrian statesman Klemens von Metternich. The meetings took place in Vienna and lasted from September 1814 to June 1815.

French invasion of Russia: The French invasion of Russia, also known as the Russian campaign, was Napoleon's attempt to force the Russian Empire to comply with the continental blockade of the United Kingdom. It resulted in one of the most devastating military campaigns in history, claiming the lives of nearly a million soldiers and civilians in less than six months.

Nazi Germany: Nazi Germany was a totalitarian dictatorship led by Adolf Hitler and the Nazi Party from 1933 to 1945. They transformed Germany into the Greater German Reich, claiming to be the successors to the Holy Roman Empire and German Empire. The regime, known as the Third Reich, lasted only 12 years before being defeated by the Allies in World War II, ending in May 1945.

Paris Commune: The Paris Commune was a short-lived revolutionary government in Paris from March to May 1871. It sought to establish socialism and popular democracy, challenging the centralized French governmental authority at the time.

Polish–Soviet War: The Polish-Soviet War occurred after World War I and the Russian Revolution. It involved the Second Polish Republic and the Russian Soviet Federative Socialist Republic. The war took place in territories previously held by the Russian Empire and the Habsburg Monarchy.

Population transfer in the Soviet Union: Population transfer in the Soviet Union refers to the enforced movement of different groups from 1930 to 1952, following orders from Joseph Stalin and Lavrentiy Beria. Categories include deportations of "anti-Soviet" individuals, entire nationalities, and organized migrations to fill ethnically cleansed areas. The deportations of the kulaks and Soviet Koreans were significant events, involving the mass relocation of entire classes and nationalities.

Revolutions of 1848: The Revolutions of 1848, also called the Springtime of the Peoples, were a series of revolutions that swept across Europe from 1848 to 1849. It was the most extensive revolutionary movement in European history.

Russian Civil War: The Russian Civil War was a multi-party conflict in the former Russian Empire following the October Revolution. Various factions fought to determine Russia's political future. It led to the formation of the Russian Socialist Federative Soviet Republic and later the Union of Soviet Socialist Republics. The war marked the end of the Russian Revolution, a significant event in the 20th century.

Russian Empire: The Russian Empire, also called Imperial Russia or simply Russia, was the Russian monarchy from 1721 to 1917. It covered most of northern Eurasia, succeeding the Tsardom of Russia after the Treaty of Nystad. The empire emerged as other neighboring powers declined, including the Swedish Empire, Polish–Lithuanian Commonwealth, Qajar Iran, Ottoman Empire, and Qing China. It had colonies in Russian America from 1799 to 1867. With an area of 22.8 million square kilometers, it was the third-largest empire in history, ruling over a population of 125.6 million people. The Russian Empire was known for its ethnic, linguistic, religious, and economic diversity.

Russian Revolution: The Russian Revolution was a period of transformative political and social change in the Russian Empire that began in 1917. It led to the overthrow of the monarchy, the establishment of a socialist government, and a brutal civil war. This revolution served as a catalyst for similar movements throughout Europe after World War I.

Russian Revolution of 1905: The Russian Revolution of 1905, also called the First Russian Revolution, saw widespread political and social unrest across the Russian Empire. The revolt targeted the Tsar, the nobility, and ruling class through worker strikes, peasant uprisings, and military rebellions. As a result, Tsar Nicholas II was pressured to make reforms, including the establishment of the State Duma, a multi-party system, and the Russian Constitution of 1906. However, the Duma had limited power and frequently clashed with the Tsar, who retained ultimate authority and dissolved the Duma three times to suppress opposition.

Russo-Turkish War (1877–1878): The Russo-Turkish War (1877–1878) was a conflict between the Ottoman Empire and a coalition led by the Russian Empire. It took place in the Balkans and Caucasus, fueled by Balkan nationalism and Russian goals of recovering territories lost in the Crimean War. The war aimed to free Balkan nations from Ottoman rule and re-establish Russian influence in the Black Sea region.

Sinking of the Titanic: The RMS Titanic, the largest ocean liner at the time, sank on 15 April 1912, four days into her maiden voyage from Southampton to New York. It struck an iceberg at 23:40 on 14 April, leading to its sinking two hours and forty minutes later at 02:20 on 15 April. Over 1,500 people lost their lives, making it one of the deadliest peacetime maritime disasters in history.

Spanish Civil War: The Spanish Civil War (1936-1939) was a conflict between the Republicans, who supported the left-leaning Popular Front government, and the Nationalists, led by General Franco. The Republicans consisted of various left-wing parties, while the Nationalists were an alliance of Falangists and conservatives. The war had multiple dimensions, viewed as a class struggle, religious conflict, and a battle between dictatorship and democracy. It also served as a precursor to World War II. The Nationalists emerged victorious and governed Spain until Franco's death in 1975.

Holodomor: The Holodomor, or Great Ukrainian Famine, was a man-made famine that occurred in Soviet Ukraine from 1932 to 1933, resulting in the death of millions of Ukrainians. It was part of a broader Soviet-wide famine during 1930-1933, mainly affecting regions that were major grain producers in the Soviet Union.

Unification of Germany: The unification of Germany was the process of creating the first nation-state for Germans. It began in 1866 with the adoption of the North German Confederation Treaty, forming a military alliance led by Prussia. This alliance was later strengthened with the adoption of the North German Constitution. The process concluded in 1871 when most south German states joined the North German Confederation, resulting in the proclamation of the German Empire. The Empire was composed of 25 member states and led by the Kingdom of Prussia. The legal events of unification took place in January and May 1871.

Empire of Brazil: The Empire of Brazil was a 19th-century state that included modern Brazil and Uruguay. It had a representative parliamentary constitutional monarchy, ruled by Emperors Pedro I and Pedro II. Brazil became the seat of the Portuguese Empire in 1808. Pedro declared independence in 1822, becoming the first Emperor. The country was vast, sparsely populated, and ethnically diverse.

Gran Colombia: Gran Colombia, or Greater Colombia, was a state in northern South America and southern Central America from 1819 to 1831. It included present-day Colombia, Ecuador, Panama, and Venezuela, along with parts of Peru, Brazil, and Guyana. The term differentiates it from the current Republic of Colombia.

Mexican–American War: The Mexican–American War was a conflict from 1846 to 1848, when the United States Army invaded Mexico. It was triggered by the American annexation of Texas in 1845, which Mexico did not recognize. This was due to Mexico refusing to acknowledge the Treaties of Velasco, signed by President Santa Anna while he was captured by the Texian Army during the 1836 Texas Revolution. The Republic of Texas, although de facto independent, desired annexation by the United States.

Mexican Revolution: The Mexican Revolution was a series of armed conflicts in Mexico from 1910 to 1920. It resulted in the destruction of the Federal Army and the rise of a revolutionary army, leading to significant changes in Mexican culture and government. The northern Constitutionalist faction gained power, drafting the current Constitution of Mexico and establishing a strong central government. Revolutionary generals ruled from 1920 to 1940. The conflict involved foreign powers, especially the United States, and caused the deaths of approximately one million people, mostly noncombatants.

Paraguayan War: The Paraguayan War, also called the War of the Triple Alliance (1864-1870), was a brutal conflict in South America between Paraguay and the Triple Alliance of Argentina, Brazil, and Uruguay. It was the deadliest war in Latin American history. Paraguay suffered heavy losses, with disputed casualty figures. The war started as a result of tensions between Paraguay and Brazil caused by the Uruguayan War. Argentina and Uruguay later joined, turning it into the "War of the Triple Alliance." Paraguay was ultimately forced to cede disputed land to Argentina and Brazil.

Spanish American wars of independence: The Spanish American wars of independence were multiple wars fought in Spanish America during the early 19th century. They aimed to gain political independence from Spanish rule. These wars started during the Napoleonic Wars and the Peninsular War. The battles took place from 1809 in present-day Bolivia to 1829 in Mexico. The conflict was a struggle between those who sought a unitary monarchy (royalists) and those who desired plural monarchies or republics (patriots).

Mexican War of Independence: The Mexican War of Independence was a revolutionary civil war and political process that led to Mexico's independence from the Spanish Empire. It consisted of various local and regional struggles occurring between 1810 and 1821. The war culminated with the drafting of the Declaration of Independence of the Mexican Empire in Mexico City on September 28, 1821, after the collapse of royal government and the victory of independence forces.

War of the Pacific: The War of the Pacific, also known as the Nitrate War, was a conflict between Chile and a Bolivian-Peruvian alliance from 1879 to 1884. It centered around Chile's territorial claims on the coastal Bolivian region in the Atacama Desert. Chile emerged victorious, acquiring resource-rich territory from Peru and Bolivia.

American frontier: The American frontier, also known as the Old West or Wild West, refers to the period of expansion in mainland North America from the 17th century until 1912. It was a time of massive migration and settlement, fueled by the Louisiana Purchase and the concept of "manifest destiny". The American frontier's legends, historical events, and folklore have become deeply ingrained in American culture, shaping the national identity and giving rise to the popular Western genre in media.

American Indian Wars: The American Indian Wars were fought by European governments, colonists, and later the United States government and settlers against various Native American tribes from the 17th to the 19th century. These conflicts resulted from settlers and governments wanting Native American lands, with some wars involving allied tribes. After the American Revolution, conflicts became localized and often centered around land disputes, leading to cycles of violence.

Dust Bowl: The Dust Bowl was a series of severe dust storms in the 1930s that damaged the environment and agriculture in the American and Canadian prairies. It was caused by both natural and human factors, such as the destruction of topsoil by settlers and a failure to use appropriate farming methods to prevent wind erosion. The drought occurred in three waves between 1934 and 1940, with some regions experiencing drought conditions for up to eight years.

Lewis and Clark Expedition: The Lewis and Clark Expedition, also known as the Corps of Discovery, was a U.S. mission to explore the newly acquired western territory after the Louisiana Purchase. Led by Lewis and Clark, a group of Army and civilian volunteers embarked on a journey from Illinois to the Pacific Ocean. They braved diverse terrains, crossed the Continental Divide, and reached the Columbia River. The expedition lasted from 1804 to 1806 and provided valuable insights into the uncharted American West.

Manhattan Project: The Manhattan Project was a collaborative effort between the United States, United Kingdom, and Canada during World War II to develop the first nuclear weapons. Led by Major General Leslie Groves, it involved the Los Alamos Laboratory, directed by J. Robert Oppenheimer. The project absorbed the British Tube Alloys program and operated under the Manhattan District. It employed about 130,000 people, cost $2 billion, and spanned over 30 sites in the three countries. The focus was on building factories, producing fissile material, and developing the weapons.

Monroe Doctrine: The Monroe Doctrine opposes European colonialism in the Western Hemisphere and considers any foreign intervention in the Americas as potentially hostile to the United States. It played a significant role in American grand strategy throughout the 20th century.

New Deal: The New Deal was a set of programs and reforms implemented by President Franklin D. Roosevelt in the United States between 1933 and 1938. It aimed to provide support for farmers, the unemployed, youth, and the elderly, and included major federal programs and agencies such as the CCC, WPA, CWA, FSA, NIRA, and SSA. The New Deal also introduced regulations and safeguards for the banking industry and worked to revive the economy. It consisted of both laws passed by Congress and presidential executive orders.

Spanish–American War: The Spanish-American War was triggered by the explosion of the USS Maine in Havana Harbor, leading to U.S. involvement in the Cuban War of Independence. It resulted in America becoming dominant in the Caribbean and acquiring Puerto Rico, Guam, and the Philippines. The war also led to U.S. participation in the Philippine Revolution and subsequent Philippine-American War.

Wall Street Crash of 1929: The Wall Street Crash of 1929, also called the Great Crash or Crash of '29, was a significant American stock market crash that took place in September-November 1929. It led to a catastrophic collapse of the New York Stock Exchange and played a crucial role in causing the worldwide Great Depression in the 1930s.

War of 1812: The War of 1812 was a conflict between the United States and the United Kingdom in North America. It started when the U.S. declared war in June 1812 and officially ended in February 1815 after the ratification of the peace treaty. The war involved indigenous allies on both sides, and Spain had limited involvement in Florida.

American Civil War: The American Civil War was a conflict in the United States between the Union and the Confederacy, fueled by the dispute over the expansion of slavery into the western territories. The war resulted from states seceding from the Union, with the central cause being the disagreement over whether to allow the establishment of more slave states or prevent slavery from spreading further.

Confederate States of America: The Confederate States of America (CSA), also known as the Confederacy or the South, was a breakaway republic in the Southern United States from 1861 to 1865. Comprised of eleven states, including South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, Tennessee, and North Carolina, the Confederacy declared secession and engaged in war against the United States during the American Civil War.

Congo Free State: The Congo Free State, also known as the Independent State of the Congo, was a large absolute monarchy in Central Africa from 1885 to 1908. It was privately owned by King Leopold II of Belgium. Although not officially part of Belgium, the two nations were in a personal union. Leopold acquired the territory by deceiving other European countries at the Berlin Conference and claiming humanitarian intentions. Through the International Association of the Congo, he asserted control over most of the Congo Basin. The name "Congo Free State" was adopted in 1885 and Leopold governed it from Brussels without ever visiting it.

Scramble for Africa: The Scramble for Africa refers to the colonization of most of Africa by seven Western European powers during "New Imperialism". In a span of four decades, European control went from 10% in 1870 to nearly 90% by 1914, leaving Liberia and Ethiopia as the only independent nations.

Anglo-Zulu War: The Anglo-Zulu War occurred in 1879 between the British Empire and the Zulu Kingdom. It was part of a larger British plan to establish control over various African regions and utilize their cheap labor. The British Empire sent Sir Bartle Frere to South Africa to implement this strategy, but faced opposition from the independent states of the South African Republic and the Kingdom of Zululand.

Second Italo-Ethiopian War: The Second Italo-Ethiopian War (1935-1937) was a conflict between Italy and Ethiopia, known as the Italian Invasion in Ethiopia and the Ethiopian War in Italy. It highlights the expansionist aims of the Axis powers and exposes the limitations of the League of Nations.

Sokoto Caliphate: The Sokoto Caliphate, also known as the Sultanate of Sokoto, was a Sunni Muslim empire in West Africa founded by Usman dan Fodio in 1804 after defeating the Hausa Kingdoms. It encompassed present-day Cameroon, Burkina Faso, Niger, and Nigeria. By 1837, it became the most populous empire in West Africa with a population of 10-20 million people. It was dissolved in 1903 when the British, French, and Germans conquered the region and incorporated it into their territories.

Great Game: The 'Great Game' was a 19th-century rivalry between the British and Russian Empires for influence in Central Asia. They used military interventions and diplomacy to acquire and redefine territories in Afghanistan, Persia, and Tibet. Russia conquered Turkestan, while Britain expanded and set borders in India. This led to the establishment of independent states, tribes, and monarchies as protectorates and territories of the two empires, extending from the Caspian Sea to the Eastern Himalayas.

Persian Constitutional Revolution: The Persian Constitutional Revolution (1905-1911) brought significant changes to Iran under the Qajar dynasty. It resulted in the establishment of a parliament, marking a pivotal moment in the country's modern history.

1911 Revolution: The 1911 Revolution, also called Xinhai Revolution, brought an end to China's Qing dynasty and established the Republic of China. It followed years of unrest and rebellion, marking the downfall of the monarchy and the start of China's early republican era after 2,132 years of imperial rule.

1931 China floods: The 1931 China floods, also known as the 1931 Yangtze–Huai River floods, devastated China between June and August 1931. Wuhan, Nanjing, and other major cities were severely affected. The floods reached their peak when a dike near Lake Gaoyou collapsed on 25 August 1931.

Boxer Rebellion: The Boxer Rebellion was a revolt in North China from 1899 to 1901. Led by the Society of Righteous and Harmonious Fists, also known as "Boxers," it aimed to oppose foreign influence and imperialism. This anti-foreign, anti-imperialist, and anti-Christian movement occurred towards the end of the Qing dynasty. The Boxers were so named because they practiced Chinese martial arts, referred to as "Chinese boxing" at the time. Ultimately, they were defeated by the Eight-Nation Alliance, composed of foreign powers.

Chinese Civil War: The Chinese Civil War was a prolonged armed conflict between the Kuomintang-led government and the Chinese Communist Party from 1927 to 1949. It ended with a Communist victory and their subsequent control over mainland China.

Empire of Japan: The Empire of Japan, also known as Imperial Japan, existed from 1868 until 1947. It ruled over various territories, including naichi and gaichi, as well as a South Seas Mandate. After World War II, Japan surrendered and its territory was reduced to the current Japanese archipelago.

First Opium War: The First Opium War was a series of military engagements between the British Empire and the Qing dynasty of China from 1839 to 1842. It started when China banned opium and seized merchants' stocks. Despite the ban, Britain demanded compensation and equal trade rights. The British navy defeated China using superior ships and weapons and imposed the Treaty of Nanking. This treaty compelled China to increase foreign trade, provide compensation, and cede Hong Kong to Britain. The opium trade continued, and this conflict marked the beginning of modern Chinese history.

First Sino-Japanese War: The First Sino-Japanese War, also known as the First China-Japan War, was a conflict between the Qing dynasty and Empire of Japan. It mainly revolved around the struggle for control over Korea. The war lasted for over six months, during which the Japanese forces achieved continuous victories on land and at sea. The Qing government sought peace in February 1895, following the loss of the strategic port of Weihaiwei.

Meiji Restoration: The Meiji Restoration, also known as the Honorable Restoration, was a political event in 1868 that reinstated imperial rule in Japan under Emperor Meiji. It consolidated the political system and marked a shift towards modernization. The goals of the restoration were outlined in the Charter Oath.

Russo-Japanese War: The Russo-Japanese War (1904-1905) was a conflict between Japan and Russia over control of Manchuria and the Korean Empire. The major battlefields were in Southern Manchuria and the Yellow Sea.

Second Opium War: The Second Opium War (1856-1860) was a conflict between the British Empire, French Empire, and the Chinese Qing dynasty. Also called the Second Anglo-Sino War, China War, or Arrow War, it was a colonial war that greatly impacted China.

Second Sino-Japanese War: The Second Sino-Japanese War (1937-1945) was a total war between the Republic of China and the Empire of Japan, often seen as the start of World War II in Asia. It was the largest Asian conflict of the 20th century, marked by Imperial Japan's war crimes against Chinese civilians. After Japan's attacks on Malaya and Pearl Harbor in 1941, the war became part of the broader China Burma India Theater of World War II.

Nanjing Massacre: The Nanjing Massacre, also known as the Rape of Nanjing, was a six-week period of mass murder, rape, looting, and arson committed by the Imperial Japanese Army in Nanjing, China in December 1937. It occurred after the Battle of Nanking during the Second Sino-Japanese War and is considered one of the worst wartime atrocities.

Taiping Rebellion: The Taiping Rebellion was a civil war in China (1850-1864) between the Qing dynasty and the Taiping Heavenly Kingdom. Led by the Hakka people, it caused 20-30 million deaths, around one-tenth to one-twentieth of China's population. The Qing government emerged victorious but suffered significant economic and political losses.

British Raj: The British Raj, also known as Crown rule in India, was the British Crown's control over the Indian subcontinent from 1858 to 1947. It encompassed British India, directly administered by the UK, and princely states under British influence. Often referred to as the Indian Empire, it ended with India's independence.

Indian Rebellion of 1857: The Indian Rebellion of 1857 was a major uprising in India against British rule. It started with a mutiny of sepoys in Meerut and spread to other parts of the country. The rebellion posed a military threat to the British, but they defeated the rebels in Gwalior. The British granted amnesty to most rebels in November 1858, but officially declared the end of hostilities in July 1859.

Indian independence movement: The Indian independence movement aimed to end British rule in India (British Raj). It spanned from several historic events until 1947 when India gained independence.

Dutch East Indies: The Dutch East Indies, or Netherlands East Indies, was a Dutch colony that included mostly modern-day Indonesia. It gained independence in 1945 after the Indonesian War of Independence and made peace with the Netherlands in 1949. The Dutch also ceded Dutch Malacca to Britain in 1824, which eventually became part of modern Malaysia.

French Indochina: French Indochina, also known as the Indochinese Union, was a group of French-controlled territories in Southeast Asia until 1954. It included Cambodia, Laos, Guangzhouwan (a Chinese territory), and various regions in Vietnam. Hanoi was the capital from 1902 to 1945, while Saigon served as the capital from 1887 to 1902 and again from 1945 to 1954.

Konbaung dynasty: The Konbaung dynasty, also called the Third Burmese Empire, was the last ruling dynasty in Burma from 1752 to 1885. They expanded the Burmese empire and implemented administrative reforms, providing the foundation for modern-day Burma. However, these reforms were not enough to prevent British colonization. The British defeated the Burmese in three Anglo-Burmese Wars from 1824 to 1885, resulting in the end of the Burmese monarchy. Today, there are claimants to the dynasty's lineage through Myat Phaya Lat, one of Thibaw's daughters.

Nguyễn dynasty: The Nguyễn dynasty was the last ruling family in Vietnam, from 1802 to 1883. They expanded their empire into southern Vietnam, Cambodia, and Laos. However, French conquest resulted in the loss of sovereignty over parts of southern Vietnam. After 1883, the Nguyễn dynasty only had nominal rule over French protectorates. They briefly became the Empire of Vietnam until 1945.

Philippine Revolution: The Philippine Revolution was a war of independence fought by the Katipunan against Spanish colonial rule from 1896 to 1898. It marked the end of Spanish domination after 333 years. Following Cuba's rebellion, the Spanish Empire clashed with the United States in a war and lost. In June 1898, the Philippine revolutionaries declared a republic, but this was disregarded by Spain. Eventually, the islands were sold to the United States in the Treaty of Paris.

Philippine–American War: The Philippine–American War was fought from 1899 to 1902 between the United States and the First Philippine Republic. It started after the US annexed the Philippines instead of recognizing their independence. This war was a continuation of the Philippines' fight for freedom against Spanish rule.

Armenian genocide: The Armenian genocide was a systematic campaign by the Ottoman Empire during World War I that aimed to annihilate the Armenian people and their identity. Led by the Committee of Union and Progress, it resulted in the mass murder of about one million Armenians through death marches to the Syrian Desert. Many others were forcibly Islamized, particularly women and children.

Turkish War of Independence: The Turkish War of Independence was a series of military campaigns led by the Turkish National Movement after the Ottoman Empire was occupied and divided following World War I. It was a conflict between Turkish Nationalists, who sought self-determination, and Allied forces and separatists. The revolution resulted in the collapse of the Ottoman Empire, the abolition of the monarchy and Islamic caliphate, and the establishment of the Republic of Turkey. This transfer of power marked a period of nationalist reform in Turkey.

1973 oil crisis: The 1973 oil crisis was caused by an oil embargo imposed by the Organization of Arab Petroleum Exporting Countries (OAPEC) against countries supporting Israel during the Fourth Arab-Israeli War. Led by Saudi Arabia's Faisal, OAPEC targeted countries like the US, UK, Canada, Japan, Netherlands, and later expanded the list. The embargo led to a global oil price increase of nearly 300%, causing an oil shock with significant short and long-term effects on the global economy and politics. It became known as the "first oil shock" compared to the later 1979 oil crisis.

2007–2008 financial crisis: The 2007–2008 financial crisis, known as the Global Financial Crisis (GFC), was a severe worldwide economic crisis comparable to the Great Depression. It was caused by predatory lending through subprime mortgages to low-income homebuyers, excessive risk-taking by global financial institutions, the accumulation of toxic assets within banks, and the subsequent bursting of the US housing bubble. These factors combined to create a "perfect storm" that triggered the Great Recession.

Civil rights movements: Civil rights movements are global campaigns for equality before the law that reached their peak in the 1960s. They often employ nonviolent protests and civil resistance to bring about change. These movements have also witnessed civil unrest and armed rebellion in some cases. While progress has been made, many of these movements still strive to fully achieve their goals. Nonetheless, they have resulted in improved legal rights for previously oppressed groups in certain regions.

Cold War: The Cold War was a period of tension between the US and the USSR and their allies, starting after WWII in 1945 and ending in 1991. Key features include geopolitical rivalry, ideological differences, and the division of the world into the Western and Eastern Blocs.

Nuclear arms race: The nuclear arms race was a competition between the United States and the Soviet Union for dominance in nuclear warfare during the Cold War. Other countries also developed nuclear weapons, but not on the same scale as the superpowers.

Warsaw Pact: The Warsaw Pact was a collective defense treaty signed in 1955 between the Soviet Union and seven other Eastern Bloc countries during the Cold War. It created a defensive alliance known as the Warsaw Treaty Organization. The pact was complementary to the Council for Mutual Economic Assistance, which was an economic organization for the region.

Collective farming: Collective farming is a system where multiple farmers work together to operate their holdings as a joint enterprise. It includes agricultural cooperatives, where member-owners collaborate in farming, and state farms, which are owned and managed by the government. This process is called collectivization. Examples of this system include the Soviet Union's kolkhozy and sovkhozy.

Contemporary history: Contemporary history refers to the time period from 1945 to the present and is a subset of modern history. It is a major subset of modern history, along with the early modern and late modern periods. In the social sciences, contemporary history is related to the rise of postmodernity.

Sexual revolution: The sexual revolution, a social movement in the 1960s-70s, challenged traditional sexual norms and behaviors in the Western world. It promoted sexual liberation, including acceptance of non-heterosexual relationships, contraception, public nudity, pornography, premarital and alternative forms of sex, homosexuality, masturbation, and legalized abortion.

COVID-19 pandemic: The COVID-19 pandemic, caused by the SARS-CoV-2 virus, began in Wuhan, China in December 2019 and quickly spread globally. The World Health Organization declared it a public health emergency in January 2020. To date, it has resulted in over 712 million cases and 6.2 million confirmed deaths, making it one of the deadliest pandemics in history.

Decolonization: Decolonization is the process of ending colonialism, where powerful nations establish control over foreign territories. The term has different interpretations. Some scholars look at independence movements and the downfall of colonial empires. Others consider economic, cultural, and psychological aspects of the colonial experience.

Electrification: Electrification is the adoption of electricity for power, often replacing previous power sources.

Information Age: The Information Age, starting in the mid-20th century, marks a major shift from traditional industries to an economy centered on information technology. Key technological developments such as the transistor in 1947 and the optical amplifier in 1957 have greatly influenced the processing and transmission of information.

Post–World War II economic expansion: The post-WWII economic expansion, or the Golden Age of Capitalism, was a period of global economic growth from after World War II to the 1973-1975 recession. It was characterized by high and sustained growth, full employment, and experienced by the US, Soviet Union, Western European, and East Asian countries.

Space exploration: Space exploration involves the use of telescopes and space technology to explore outer space. It includes both robotic space probes and human spaceflight. This field contributes significantly to space science alongside classical astronomy.

Exploration of Mars: Mars exploration involves remotely studying the planet with spacecraft. Sending probes from Earth has significantly increased our understanding of Martian geology and potential habitability. However, the complexity of engineering interplanetary journeys has resulted in a high failure rate, with around 60% of missions failing. Yet, there have been unexpected successes, like the long-lasting Mars Exploration Rovers, Spirit and Opportunity, which exceeded their intended lifespan.

Moon landing: A Moon landing refers to a spacecraft's arrival on the surface of the Moon. It can be manned or unmanned. The Soviet Union's Luna 2 was the first human-made object to land on the Moon on 13 September 1959.

Space Race: The Space Race was a competition between the United States and the Soviet Union in the 20th century to achieve superior spaceflight capability. It originated from the nuclear arms race after World War II and reached its peak with the Moon Race. Achieving spaceflight capability became crucial for national security and symbolic of the time. The Space Race included pioneering launches of satellites, robotic probes to other celestial bodies, and human spaceflight to the Moon.

War on terror: The War on Terror, also known as the Global War on Terrorism (GWOT), is a worldwide military effort launched by the United States after the September 11 attacks. It targets militant Islamist movements like Al-Qaeda, Taliban, and their allies, as well as the Ba'athist regime in Iraq. The war has seen multiple conflicts and insurgencies. Additionally, the Islamic State militia has become a significant adversary of the United States after their territorial expansion in 2014.

Iraq War: The Iraq War was a long-lasting armed conflict from 2003 to 2011, initiated by a US-led coalition that removed Saddam Hussein's Ba'athist government. The war continued as an insurgency against coalition forces and the new Iraqi government. US troops officially withdrew in 2011, but became re-involved in 2014. The conflict has ongoing dimensions, and it started as part of the George W. Bush administration's response to the September 11 attacks.

Algerian War: The Algerian War was a significant armed conflict between France and the Algerian National Liberation Front (FLN) from 1954 to 1962. It resulted in Algeria gaining independence from France, making it a key decolonization conflict. The war involved guerrilla warfare, war crimes, and internal divisions among communities. While primarily fought in Algeria, it also had implications for metropolitan France.

Angolan Civil War: The Angolan Civil War was a conflict that took place in Angola from 1975 to 2002. It started after Angola gained independence from Portugal and was a power struggle between the communist MPLA and the anti-communist UNITA guerrilla movements.

Apartheid: Apartheid was a system of racial segregation in South Africa and South West Africa from 1948 to the early 1990s. It was characterized by political dominance of the white minority, with whites having the highest social status. Indians, Coloureds, and Black Africans were ranked lower in the social hierarchy. Apartheid resulted in lasting economic and social inequality in the region.

Ethiopian Civil War: The Ethiopian Civil War (1974-1991) was a conflict between the Ethiopian military junta called the Derg and anti-government rebels from Ethiopia and present-day Eritrea.

Nigerian Civil War: The Nigerian Civil War, also called the Nigerian-Biafran War, was fought between Nigeria and the secessionist state of Biafra from 1967 to 1970. Led by General Gowon, Nigeria aimed to reunify the country, while Biafra, led by Ojukwu, sought independence for the Igbo ethnic group. The conflict stemmed from political, economic, ethnic, cultural, and religious tensions that had arisen since Nigeria's independence from the UK. Factors leading to the war included military and political coups, as well as anti-Igbo violence in Northern Nigeria.

Rwandan genocide: The Rwandan genocide, also known as the genocide against the Tutsi, took place over a 100-day period from April to July 1994 during the Rwandan Civil War. Armed Hutu militias targeted the Tutsi minority, along with some moderate Hutu and Twa, resulting in a significant loss of life. Official figures suggest over 1 million deaths, but scholarly estimates range from 500,000 to 800,000 Tutsi fatalities.

Second Boer War: The Second Boer War, also called the Boer War or Anglo–Boer War, was a conflict between the British Empire and the Boer Republics from 1899 to 1902. It arose from the Empire's desire for control in Southern Africa.

Second Congo War: The Second Congo War, also known as Africa's World War, started in August 1998 in the Democratic Republic of the Congo. It occurred shortly after the First Congo War and addressed similar issues.

Cuban Missile Crisis: The Cuban Missile Crisis was a 13-day confrontation between the US and the Soviet Union in 1962. American nuclear missile deployments in Italy and Turkey were countered by Soviet deployments in Cuba. It is regarded as the closest the Cold War came to full-scale nuclear war.

Cuban Revolution: The Cuban Revolution (1953-1959) aimed to overthrow the Cuban government. Fidel Castro, after facing a coup in 1952, led a failed attack on the Cuban military in 1953. He and his supporters formed the 26th of July Movement while in prison. After gaining amnesty, they invaded Cuba from Mexico in 1956. The rebel army gradually defeated the Cuban army in rural areas and engaged in sabotage and recruitment in urban areas. By late 1958, the 26th of July Movement gained support from the Popular Socialist Party and the Revolutionary Directorate of March 13. Together, they ousted Batista and brought about the revolution.

Civil rights movement: The civil rights movement was a nonviolent campaign in the US from 1954 to 1968, aiming to end racial segregation, discrimination, and disenfranchisement. It started in the late 19th century and gained momentum in the 1940s. The movement achieved significant legislative victories in the 1960s through grassroots protests and nonviolent resistance. Its efforts resulted in the establishment of federal protections for the civil rights of all Americans.

September 11 attacks: The September 11 attacks, also known as 9/11, were coordinated suicide terrorist attacks by al-Qaeda in 2001. 19 terrorists hijacked four planes and crashed two into the Twin Towers in New York City. The other two flights aimed for targets in Washington, D.C. - one striking the Pentagon and the fourth crashing in Pennsylvania. These attacks killed nearly 3,000 people and led to the global war on terror.

2004 Indian Ocean earthquake and tsunami: The 2004 Indian Ocean earthquake and tsunami was a major earthquake that struck off the coast of Sumatra, Indonesia. It had a magnitude of 9.1-9.3 and was caused by a rupture between the Burma Plate and the Indian Plate. The earthquake triggered a devastating tsunami, resulting in widespread destruction in the region.

Afghan conflict: The Afghan conflict refers to the continuous armed unrest in Afghanistan since the 1970s. It began after the collapse of the Kingdom of Afghanistan in 1973 and intensified after the Saur Revolution in 1978. The Soviet Union intervened in 1979, leading to the Soviet-Afghan War. During this time, the Afghan mujahideen received support from Pakistan, the United States, and Saudi Arabia.

Iran–Iraq War: The Iran-Iraq War was a conflict between Iran and Iraq from 1980 to 1988. Iraq invaded Iran to prevent the export of Iran's revolutionary ideology and to counter fears of sectarian tensions. Iraq also aimed to replace Iran as the dominant power in the Persian Gulf. The war lasted for eight years until a United Nations resolution was accepted by both sides.

Iranian Revolution: The Iranian Revolution, also called the Islamic Revolution, was a political and ideological uprising in 1979. It brought about the removal of the Pahlavi dynasty and establishment of the Islamic Republic of Iran, led by Ayatollah Khomeini. This revolution ended Iran's monarchy under the rule of Mohammad Reza Pahlavi, marking a significant transformation in the country's governance.

Korean War: The Korean War (1950-1953) was a conflict between North and South Korea. It started when North Korea invaded South Korea on 25 June 1950 and ended with an armistice on 27 July 1953. China and the Soviet Union supported North Korea, while South Korea received support from the United States and the United Nations (UN).

1989 Tiananmen Square protests and massacre: The 1989 Tiananmen Square protests in Beijing, China were student-led demonstrations held from April 15 to June 4. The protests aimed for a peaceful resolution but ended with a Chinese government-declared martial law and troops occupying the square on the night of June 3, known as the Tiananmen Square massacre. These events are also referred to as the '89 Democracy Movement, the Tiananmen Square Incident, or the Tiananmen uprising.

Cultural Revolution: The Cultural Revolution was a sociopolitical movement in China from 1966 to 1976, led by Mao Zedong. Its aim was to eliminate remnants of capitalism and traditional influences in Chinese society to preserve communism. Despite not achieving its main goals, it restored Mao's power after a period of absence caused by more moderate policies following the Great Leap Forward and the ensuing Great Chinese Famine.

Great Leap Forward: The Great Leap Forward was a campaign in China from 1958 to 1962, led by Mao Zedong, to transform the nation from an agrarian to an industrialized society. People's communes were established and efforts were made to boost grain production and bring industry to rural areas. Local officials, driven by fear and competition, exaggerated achievements and collected non-existent surpluses, causing millions of farmers to starve. The true extent of the economic disaster was hidden, resulting in a devastating famine and an estimated death toll ranging from 15 to 55 million.

1970 Bhola cyclone: The 1970 Bhola cyclone was a catastrophic tropical cyclone in the Bengal region. On November 12, it struck East Pakistan and India's West Bengal, causing immense devastation. This cyclone holds the grim record for being the deadliest ever recorded, with an estimated death toll ranging from 300,000 to 500,000 people. The storm surge, which flooded the Ganges Delta's low-lying islands, was responsible for most of the fatalities. Bhola was also the most powerful cyclonic storm of the 1970 North Indian Ocean cyclone season.

Bangladesh Liberation War: The Bangladesh Liberation War was a revolution and armed conflict in East Pakistan that led to the independence of Bangladesh. It started when the Pakistani military junta launched Operation Searchlight against the people of East Pakistan, resulting in widespread violence and the Bangladesh genocide.

Partition of India: The Partition of India in 1947 was the division of political borders and assets that occurred when the British Raj dissolved. This resulted in the creation of two independent dominions - India and Pakistan. India is now the Republic of India, while Pakistan comprises two regions, Pakistan and Bangladesh. The partition involved the division of Bengal and Punjab provinces, with Muslim-majority areas going to Pakistan and non-Muslim-majority areas to India. Assets such as the military, navy, air force, civil service, railways, and treasury were also divided. Independent Pakistan and India were established on August 14 and 15, 1947.

Sri Lankan Civil War: The Sri Lankan Civil War was a conflict in Sri Lanka from 1983 to 2009. The Liberation Tigers of Tamil Eelam rebel group fought against the government to establish a separate Tamil state due to discrimination against Sri Lankan Tamils.

Khmer Rouge: The Khmer Rouge was a communist party that ruled Cambodia from 1975 to 1979. The name was given by Norodom Sihanouk in the 1960s and referred to the country's communist-led dissidents.

First Indochina War: The First Indochina War (1946-1954) was fought between France and the Việt Minh, led by Võ Nguyên Giáp and Hồ Chí Minh. It primarily occurred in Northern Vietnam but also affected the whole country, as well as the French Indochina protectorates of Laos and Cambodia.

Indonesian National Revolution: The Indonesian National Revolution, also called the Indonesian War of Independence, was a conflict between Indonesia and the Dutch Empire from 1945 to 1949. It involved armed fighting, diplomacy, and a social revolution. It began with Indonesia's declaration of independence and ended with the Netherlands transferring sovereignty over the Dutch East Indies to the Republic of the United States of Indonesia.

Vietnam War: The Vietnam War was a major conflict in Southeast Asia from 1955 to 1975. It involved Vietnam, Laos, and Cambodia and was a key battleground of the Cold War. The war was fought between North and South Vietnam, with the north supported by the Soviet Union and China, while the south was backed by the United States and its allies. Lasting almost 20 years, it also impacted neighboring countries, leading to the communist takeover of Vietnam, Laos, and Cambodia by 1976.

Arab–Israeli conflict: The Arab-Israeli conflict is a political and military dispute between Arab countries and Israel that began in the 20th century. It is rooted in the support of Arab League countries for Palestinians in their conflict with Israel, which arose with the rise of Zionism and Arab nationalism in the late 19th century.

Israeli–Palestinian conflict: The Israeli-Palestinian conflict is a long-standing military and political dispute in the Levant region. It involves key issues such as Israeli occupation of the West Bank and Gaza Strip, the status of Jerusalem, Israeli settlements, borders, security and water rights. The conflict also encompasses Palestinian freedom of movement and the right of return.

Gulf War: The Gulf War was an armed conflict between Iraq and a coalition led by the United States. It consisted of two main phases: Operation Desert Shield, a military buildup from August 1990 to January 1991, and Operation Desert Storm, an aerial bombing campaign against Iraq from January to February 1991, resulting in the liberation of Kuwait.

European integration: European integration refers to the progressive amalgamation of European states, economically, politically, legally, socially, and culturally. The primary vehicle for this process is the European Union and its policies.

Iron Curtain: The Iron Curtain was a political boundary that divided Europe into two separate areas from 1945 to 1991. It represented the Soviet Union's efforts to cut off contact with the West, its allies, and neutral states. Countries influenced by the Soviets were on the east side, while NATO members or countries influenced by the United States were on the west side. Economic and military alliances formed on both sides. The Iron Curtain also referred to a physical barrier of fences, walls, minefields, and watchtowers, including the Berlin Wall.

Czechoslovakia: Czechoslovakia was a landlocked state in Central Europe that existed from 1918 to 1939. It declared independence from Austria-Hungary, but lost territories to Nazi Germany, Hungary, and Poland. During World War II, Slovakia and Carpathian Ruthenia separated, while Bohemia and Moravia became a German Protectorate. Former President Edvard Beneš formed a government-in-exile seeking recognition from the Allies.

Eastern Bloc: The Eastern Bloc, also known as the Communist Bloc, was a coalition of communist states aligned with the Soviet Union during the Cold War. It consisted of countries in Central and Eastern Europe, Asia, Africa, and Latin America. These states followed the ideology of Marxism-Leninism, opposing the capitalist Western Bloc. The Eastern Bloc was often referred to as the "Second World". The term "First World" represented the Western Bloc, while the "Third World" included non-aligned countries in Africa, Asia, and Latin America, as well as Yugoslavia.

Hungarian Revolution of 1956: The Hungarian Revolution of 1956, also called the Hungarian Uprising, was a nation-wide revolt against the Soviet-influenced government of the Hungarian People's Republic. Lasting for 12 days, the uprising was brutally suppressed by Soviet tanks and troops on 4 November 1956. This led to thousands of casualties and the exodus of nearly a quarter of a million Hungarians from the country.

Prague Spring: The Prague Spring was a period in Czechoslovakia from January to August 1968 characterized by political liberalization and mass protests. It was initiated by Alexander Dubček's election as First Secretary of the Communist Party, aiming for reforms. However, it was abruptly ended when the Soviet Union and other Warsaw Pact nations invaded Czechoslovakia to suppress the movement.

Revolutions of 1989: The Revolutions of 1989, also known as the Fall of Communism, were a series of liberal democracy movements that led to the collapse of Marxist-Leninist governments in the Eastern Bloc and beyond. Also referred to as the Fall of Nations or Autumn of Nations, this wave of revolutions may have played a role in the eventual dissolution of the Soviet Union and the abandonment of communist regimes worldwide. These events significantly reshaped the global power balance, marking the end of the Cold War and the beginning of a new era.

Soviet Union: The Soviet Union (USSR) was a transcontinental country that existed from 1922 to 1991. It was a successor state to the Russian Empire and encompassed fifteen national republics. The Russian SFSR was the largest and most populous. The government and economy of the USSR were highly centralized. It was a one-party state governed by the Communist Party and considered a flagship communist state.

Chernobyl disaster: The Chernobyl disaster occurred in 1986 when the No. 4 reactor at the Chernobyl Nuclear Power Plant in Ukraine exploded, causing one of the two nuclear accidents rated at the highest severity level. The response involved over 500,000 personnel and cost approximately $68 billion in today's currency. This incident is considered the most catastrophic nuclear disaster in history.

Dissolution of the Soviet Union: The dissolution of the Soviet Union was the disintegration process that led to its 15 republics gaining full independence on December 26, 1991. It was the result of internal stagnation, ethnic separatism, and a political crisis. Efforts to reform the political and economic system failed, leading to the resignation of General Secretary Mikhail Gorbachev. The Russian, Byelorussian, and Ukrainian SSRs were among the first to declare the end of the Soviet Union, followed by eight more republics. The Soviet parliament voted to dissolve itself after Gorbachev's resignation.

Yugoslavia: Yugoslavia, existing from 1918 to 1992, was a country in Southeast and Central Europe.

German reunification: German reunification refers to the process of establishing Germany as a single sovereign state, occurring between November 1989 and March 1991. The Unification Treaty, effective from October 1990, dissolved the German Democratic Republic and integrated its constituent states into the Federal Republic of Germany. This led to the formation of present-day Germany, celebrated annually as German Unity Day since 1991. Additionally, as part of reunification, East and West Berlin were merged into a single city, which eventually became the country's capital.

Berlin Wall: The Berlin Wall was a guarded concrete barrier that separated West Berlin from East Berlin and the German Democratic Republic. Construction began in 1961 and included guard towers, concrete walls, anti-vehicle trenches, and other defenses. The main purpose of the Wall was to prevent East German citizens from escaping to the West.

The Troubles: The Troubles were an ethno-nationalist conflict in Northern Ireland from the late 1960s to 1998. This conflict, also known as the Northern Ireland conflict, lasted for about 30 years and is sometimes referred to as an "irregular war" or "low-level war." While centered in Northern Ireland, the violence occasionally spread to the Republic of Ireland, England, and mainland Europe. The Good Friday Agreement in 1998 is widely considered as the end of the Troubles.

Geography: Geography is the study of Earth's lands, features, inhabitants, and phenomena. It seeks to understand both the human and natural complexities of our planet, including how things have changed over time. While specific to Earth, geography also has applications in planetary science. It is seen as a bridge between natural and social sciences.

Exploration: Exploration is a human activity with an expectation of discovery, but it is also common among organisms capable of directed locomotion and learning. It involves organized efforts as well as individual foraging behaviors, where feedback from returning individuals influences the group's exploration.

Africa: Africa is the second-largest and second-most populous continent on Earth, covering 20% of the land area and inhabited by 1.4 billion people. Despite its rich natural resources, it is the least wealthy continent per capita due to factors such as geography, climate, tribalism, colonialism, and corruption. Nonetheless, recent economic growth and a large, young population establish Africa as a significant global market.

Eurasia: Eurasia is the largest continental area on Earth, consisting of both Europe and Asia. It is often considered a single continent by geographers. The notion of Europe and Asia as separate continents has been established since ancient times, even though their borders have changed throughout history. Eurasia is connected to Africa at the Suez Canal, and together they form the largest continuous landmass on Earth called Afro-Eurasia.

Europe: Europe is a continent in the Northern Hemisphere, bordered by the Arctic Ocean, Atlantic Ocean, Mediterranean Sea, and Asia. It shares the landmass of Eurasia and Afro-Eurasia. The Ural Mountains, Ural River, Caspian Sea, Greater Caucasus, Black Sea, and Turkish strait separate it from Asia.

Asia: Asia is the world's largest continent with a land area of over 44 million square kilometers and a population of 4.7 billion, making up about 60% of the global population. It has been home to many early civilizations and currently covers about 30% of the Earth's land and 8% of its surface.

Americas: The Americas, also known as America, encompass North and South America, making up the majority of the Western Hemisphere. It is a landmass referred to as the New World.

North America: North America is a continent in the Northern and Western Hemispheres. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the east, South America and the Caribbean Sea to the southeast, and the Pacific Ocean to the west and south. Greater North America includes Canada, Mexico, Central America, the Caribbean Islands, and Greenland.

South America: South America is a continent located mostly in the Southern Hemisphere, with a smaller part in the Northern Hemisphere. It is considered the southern subregion of the larger continent known as America.

Antarctica: Antarctica is Earth's southernmost and least-populated continent, surrounded by the Southern Ocean. It is the fifth-largest continent, covering an area of 14,200,000 km2 (5,500,000 sq mi). Most of Antarctica is covered by the Antarctic ice sheet, with the geographic South Pole located within its boundaries.

Australia (continent): Australia (continent) is located within the Southern and Eastern hemispheres and is sometimes referred to as Sahul, Australia-New Guinea, Australinea, or Meganesia. It includes mainland Australia, Tasmania, New Guinea, and other nearby islands. Australia is the smallest of the seven traditional continents and is situated in the geographical region of Oceania.

Cartography: Cartography is the art and science of creating and using maps. It involves the combination of scientific knowledge, aesthetic considerations, and technical skills to effectively convey spatial information.

Map: A map is a symbolic representation highlighting relationships between elements in a space, like objects, regions, or themes.

Map projection: A map projection is a transformation used in cartography to represent the Earth's curved surface on a flat plane. It converts coordinates from the globe to a 2D map, making it a vital aspect of map creation.

Mercator projection: The Mercator projection is a cylindrical map projection created by Gerardus Mercator in 1569. It became the standard for navigation due to its unique representation of north as up and south as down, while preserving local directions and shapes. However, it inflates the size of objects away from the equator, causing landmasses like Greenland and Antarctica to appear much larger than they actually are.

Atlas: An atlas is a compilation of maps, usually of Earth or a specific region. It provides a collection of geographical details in a single resource.

Globe: A globe is a spherical model of Earth or other celestial bodies that accurately represents their surface without distortion. It serves similar purposes to maps, but on a 3D scale. A terrestrial globe represents Earth, while a celestial globe represents the celestial sphere.

Border: Borders are geographical or political boundaries defined by features like oceans or governments. They can be established through warfare, colonization, or mutual agreements known as boundary delimitation.

Surveying: Surveying is the practice of measuring and mapping the positions of points on the Earth's surface. It involves determining distances and angles between these points to create accurate maps and establish boundaries for ownership and construction purposes. This technique is essential in various fields, including government, law, and civil engineering.

Geographic coordinate system: The Geographic Coordinate System (GCS) is a widely used reference system for measuring and communicating positions on Earth using latitude and longitude. It is the basis for most other spatial reference systems. Unlike a cartesian system, GCS measures angles, not distances, because it is based on a spherical or geodetic model of the Earth.

Elevation: Elevation is the measurement of a location's height above or below a fixed reference point, typically the Earth's sea level. It refers to points on the Earth's surface, while altitude is used for points above the surface and depth for points below the surface.

Latitude: Latitude is a coordinate that indicates the north-south position of a point on Earth or another celestial body. It is measured as an angle from -90° (south pole) to 90° (north pole), with 0° at the Equator. Lines of latitude run east-west as circles parallel to the equator. Latitude and longitude together form a coordinate pair to specify a location on Earth.

Longitude: Longitude is a geographic coordinate that measures the east-west position of a point on Earth. Meridians connect points with the same longitude, and the prime meridian defines 0° longitude. The International Reference Meridian at the Royal Observatory in Greenwich, London is commonly used. Positive longitudes are east, and negative longitudes are west.

Geodetic datum: A geodetic datum is a global reference system used to accurately represent the position of locations on Earth or other planetary bodies. It is crucial for various technologies and techniques such as geodesy, navigation, surveying, GIS, remote sensing, and cartography. A horizontal datum measures location across the Earth's surface, while a vertical datum measures elevation or depth relative to a standard origin like mean sea level. The WGS 84 datum, used by GPS, has become widely adopted globally. Unlike previous datums, WGS 84 is designed for global use.

Geoid: The geoid is the shape of the Earth's ocean surface in the absence of winds and tides, determined by Earth's gravity and rotation. It is a smooth but irregular surface caused by the uneven distribution of mass. Extensive gravitational measurements and calculations are necessary to understand it. The geoid has been a significant concept in geodesy and geophysics for nearly 200 years and has been defined precisely since advancements in satellite geodesy in the late 20th century.

Remote sensing: Remote sensing is a method of gathering information about objects or phenomena without direct contact. It is commonly used to study Earth and other planets. This technique finds applications in various fields such as geophysics, geography, land surveying, and Earth science. Remote sensing has diverse applications, including military, intelligence, commercial, economic, planning, and humanitarian purposes.

Equator: The Equator is an imaginary line dividing Earth into the Northern and Southern hemispheres, located at 0 degrees latitude. It is about 40,075 km (24,901 mi) in circumference and positioned halfway between the North and South poles. It can also refer to a similar line on other spherical celestial bodies.

Tropic of Cancer: The Tropic of Cancer, or Northern Tropic, is the furthest north latitude where the Sun can be directly overhead. It occurs during the June solstice when the Northern Hemisphere tilts towards the Sun. During the December Solstice, it reaches 90 degrees below the horizon at solar midnight. Currently, it is located 23°26′10.2″ north of the Equator.

Tropic of Capricorn: The Tropic of Capricorn is a latitude line that marks the southernmost point where the Sun is directly overhead during the December solstice. It also reaches 90 degrees below the horizon at solar midnight during the June solstice. Its counterpart in the Northern Hemisphere is the Tropic of Cancer.

Arctic Circle: The Arctic Circle is the northernmost of the major circles of latitude on Earth, located at approximately 66°34' N. It is one of the two polar circles, with its counterpart being the Antarctic Circle.

Antarctic Circle: The Antarctic Circle is the southernmost of the major circles of latitude on Earth. It marks the boundary of the Antarctic region, while the zone immediately north of it is called the Southern Temperate Zone. South of the Antarctic Circle, there is a day of 24 continuous hours of sunlight and a day of complete darkness each year. Similar conditions exist within the Arctic Circle in the Northern Hemisphere.

Prime meridian: The prime meridian is an arbitrarily-chosen reference line used in geographic coordinates to define 0° longitude. It divides the Earth into the Eastern and Western Hemispheres. The current international standard prime meridian is the IERS Reference Meridian, slightly different from its predecessor, the Greenwich Meridian.

International Date Line: The International Date Line (IDL) is an imaginary line on the Earth's surface that separates one calendar day from the next. It runs through the Pacific Ocean along the 180.0° line of longitude, with some deviations around territories and islands. Crossing eastbound reduces the date by a day, while crossing westbound increases it.

North Pole: The North Pole, also called the Geographic North Pole or True North Pole, is the point in the Northern Hemisphere where Earth's axis intersects its surface. It is distinct from the Magnetic North Pole, and it marks the location where Earth's rotation axis meets its surface in the north.

South Pole: The South Pole, or Geographic South Pole, is the southernmost point on Earth, located opposite the North Pole. It lies 20,004 km away from any direction and marks the intersection of Earth's axis of rotation with its surface.

Arctic: The Arctic is a polar region at the northernmost part of Earth, consisting of the Arctic Ocean, adjacent seas, and parts of several countries. It is characterized by seasonally changing snow and ice cover and treeless permafrost. The Arctic seas have seasonal sea ice in many areas.

Tropics: The tropics are the regions of the Earth near the Equator, ranging from the Tropic of Cancer in the Northern Hemisphere to the Tropic of Capricorn in the Southern Hemisphere. These areas are known as the tropical zone or torrid zone.

Arctic Ocean: The Arctic Ocean, the smallest and shallowest of the world's major oceans, spans approximately 14,060,000 km2 (5,430,000 sq mi). Considered one of the coldest oceans, it is recognized as an ocean by the International Hydrographic Organization. Some refer to it as the Arctic Mediterranean Sea or an estuary of the Atlantic Ocean. It is also considered the northernmost part of the World Ocean.

Baffin Bay: Baffin Bay is a marginal sea located between Baffin Island and Greenland's west coast. It is considered both a part of the Arctic and North Atlantic Oceans. The bay is connected to the Atlantic via Davis Strait and Labrador Sea, and to the Arctic Ocean through the narrower Nares Strait. Navigating the bay is challenging due to extensive ice cover and floating ice. However, a summer polynya called the North Water opens near Smith Sound. Aquatic life in the bay is mainly concentrated in this region.

Barents Sea: The Barents Sea is a marginal sea of the Arctic Ocean, bordering northern Norway and Russia. It is divided between Norwegian and Russian territories. Previously known as the Northern Sea or Pomorsky Sea, its current name is in honor of the Dutch navigator Willem Barentsz.

Beaufort Sea: The Beaufort Sea is a marginal sea in the Arctic Ocean, located north of the Northwest Territories, the Yukon, and Alaska. It is named after Sir Francis Beaufort and is surrounded by Canada's Arctic islands. The Mackenzie River, Canada's longest river, empties into the sea's Canadian part west of Tuktoyaktuk.

Greenland Sea: The Greenland Sea is a body of water located west of Greenland, east of the Svalbard archipelago, north of Fram Strait and the Arctic Ocean, and south of the Norwegian Sea and Iceland. It is sometimes considered part of the Arctic Ocean and sometimes part of the Atlantic Ocean. As part of the Nordic Seas, it plays a crucial role in connecting the Arctic and Atlantic oceans, leading to concerns about its potential impact on thermohaline circulation. In oceanography, it is often referred to as the "Arctic Mediterranean Sea".

Hudson Bay: Hudson Bay (or Hudson's Bay) is a vast saltwater body located in northeastern Canada. It is politically part of Nunavut and serves as an inland marginal sea of the Arctic Ocean. With a surface area of 1,230,000 km2, it drains a large region spanning parts of Nunavut, Alberta, Saskatchewan, Ontario, Quebec, Manitoba, and even parts of the US states of North Dakota, South Dakota, Minnesota, and Montana. The southern arm of Hudson Bay is known as James Bay.

Kara Sea: The Kara Sea is a marginal sea in the Arctic Ocean, bordered by the Barents Sea and Novaya Zemlya to the west, and the Laptev Sea and Severnaya Zemlya to the east. It is an extension of the Arctic Ocean in northern Siberia.

White Sea: The White Sea is an inlet of the Barents Sea in Russia's northwest. It is bordered by Karelia, the Kola Peninsula, and the Kanin Peninsula. It is entirely under Russian control and is considered part of Russia's internal waters. It is divided administratively between Arkhangelsk and Murmansk oblasts and the Republic of Karelia.

Atlantic Ocean: The Atlantic Ocean, the second-largest ocean, covers about 17% of Earth's surface. It separates Africa, Europe, and Asia from the Americas.

Baltic Sea: The Baltic Sea is an arm of the Atlantic Ocean, surrounded by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, and Sweden. It is situated in the North and Central European Plain.

Bay of Biscay: The Bay of Biscay is a gulf in the northeast Atlantic Ocean, found south of the Celtic Sea. It stretches along the western coast of France, from Point Penmarc'h to the Spanish border, and continues along the northern coast of Spain, extending to Cape Ortegal. The region that covers the northern coast of Spain is locally known as the Cantabrian Sea.

Black Sea: The Black Sea is a Mediterranean sea located between Europe and Asia. It is bordered by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. Major rivers, such as the Danube, Dnieper, and Dniester, supply the sea. It has a coastline in six countries and its drainage basin includes parts of 24 European countries.

Sea of Azov: The Sea of Azov is a shelf sea in Eastern Europe, connected to the Black Sea by the Strait of Kerch. It is considered an extension of the Black Sea and is bordered by Russia and Ukraine, with the latter currently under Russian occupation. The sea serves as a crucial access route for Central Asia through the Volga-Don Canal, originating from the Caspian Sea.

Caribbean Sea: The Caribbean Sea is a part of the Atlantic Ocean located in the Western Hemisphere's tropics. It is surrounded by Mexico, Central America, the Greater Antilles, the Lesser Antilles, and the northern coast of South America. The Gulf of Mexico lies to its northwest.

Gulf of Mexico: The Gulf of Mexico is a marginal sea of the Atlantic Ocean, surrounded by the North American continent. It is bounded by the Gulf Coast of the United States and Mexican states. The southern U.S. states bordering it are often called the "Third Coast" of the United States.

Gulf Stream: The Gulf Stream is a warm and fast ocean current that originates in the Gulf of Mexico and flows up the eastern US coast towards Northwest Europe. It is accompanied by the North Atlantic Drift. The process of western intensification causes the Gulf Stream to accelerate northward. At around 40°0′N 30°0′W, it splits into the North Atlantic Drift and the Canary Current.

Gulf of Guinea: The Gulf of Guinea is a region in the tropical Atlantic Ocean, stretching from Gabon to Liberia. It includes Null Island, located at the intersection of the Equator and Prime Meridian.

Irish Sea: The Irish Sea is a body of water separating Ireland and Great Britain. It is connected to the Celtic Sea in the south and the West Coast of Scotland in the north. The largest islands within the Irish Sea are Anglesey and the Isle of Man. It may also be referred to as the Manx Sea.

Labrador Sea: The Labrador Sea is a section of the North Atlantic Ocean, located between the Labrador Peninsula and Greenland. Surrounded by continental shelves in three directions, it connects to Baffin Bay through the Davis Strait. Considered a marginal sea of the Atlantic.

Mediterranean Sea: The Mediterranean Sea is a sea surrounded by land, connected to the Atlantic Ocean. It has been crucial in shaping Western civilization. Around 5.9 million years ago, it was isolated and dried up, but was refilled about 5.3 million years ago by a massive flood.

Adriatic Sea: The Adriatic Sea is a body of water that separates the Italian and Balkan Peninsulas. It is the northernmost part of the Mediterranean Sea, extending from the Strait of Otranto to the northwest and the Po Valley. Countries with coasts on the Adriatic include Albania, Bosnia and Herzegovina, Croatia, Italy, Montenegro, and Slovenia.

Aegean Sea: The Aegean Sea is a part of the Mediterranean Sea located between Europe and Asia. It covers an area of 215,000 km2 and is connected to the Marmara Sea, which leads to the Black Sea. The Aegean Islands, including Crete and Rhodes, are found within the sea. It reaches a depth of 2,639 m and is divided into the Thracian Sea and the Sea of Crete.

Ionian Sea: The Ionian Sea is a long bay in the Mediterranean Sea, surrounded by Southern Italy, Albania, and the west coast of Greece. It connects to the Adriatic Sea and includes notable regions like Sicily and the Peloponnese.

Sea of Marmara: The Sea of Marmara is an inland sea in Turkey that connects the Black Sea to the Aegean Sea. It separates Turkey's European and Asian sides and has an area of 11,350 km2. The sea is 280 km long, 80 km wide, and its greatest depth is 1,370 m.

North Sea: The North Sea is a large body of water located between several countries in Europe, including Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium, and France. It is connected to the Atlantic Ocean through the English Channel in the south and the Norwegian Sea in the north. This epeiric sea, situated on the European continental shelf, spans over 970 kilometers in length and 580 kilometers in width, covering an area of approximately 570,000 square kilometers.

Norwegian Sea: The Norwegian Sea is a marginal sea northwest of Norway, between the North Sea and the Greenland Sea. It is grouped with either the Atlantic Ocean or the Arctic Ocean. The Barents Sea borders it to the northeast, while a submarine ridge separates it from the Atlantic Ocean and the Jan Mayen Ridge separates it from the Greenland Sea.

Gulf of St. Lawrence: The Gulf of St. Lawrence is a semi-enclosed sea connected to the Atlantic Ocean via the St. Lawrence River. It covers an area of 226,000 square kilometres and contains about 34,500 cubic kilometres of water. The average depth is 152 metres.

Sargasso Sea: The Sargasso Sea is an area in the Atlantic Ocean known for its distinct features. It is unique because it has no land boundaries and is defined by a circular movement of four ocean currents. This creates a special kind of ocean gyre. The sea is characterized by its brown Sargassum seaweed and calm blue water, setting it apart from other parts of the Atlantic Ocean.

Indian Ocean: The Indian Ocean is the third-largest ocean, covering about 20% of Earth's surface. It is surrounded by Asia, Africa, and Australia, while the Southern Ocean marks its southern boundary. There are several regional seas within it, including the Arabian Sea, Laccadive Sea, Bay of Bengal, and Andaman Sea.

Andaman Sea: The Andaman Sea, located in the northeastern Indian Ocean, is bordered by Myanmar and Thailand along the Gulf of Martaban and the west side of the Malay Peninsula. It is connected to the Bay of Bengal by the Andaman Islands and the Nicobar Islands. The southern end is at Breueh Island, north of Sumatra, with the Strait of Malacca found further southeast.

Arabian Sea: The Arabian Sea is a region of sea in the northern Indian Ocean, bordered by the Arabian Peninsula, Gulf of Aden, Gulf of Oman, Iran, Pakistan, India, the Laccadive Sea, Maldives, and Somalia. It covers an area of 3,862,000 km2 (1,491,000 sq mi) with a maximum depth of 4,652 meters (15,262 ft). It is connected to the Red Sea through the strait of Bab-el-Mandeb and to the Persian Gulf through the Gulf of Oman.

Bay of Bengal: The Bay of Bengal, located between the Indian subcontinent and the Indochinese peninsula, is the largest bay in the world. It is part of the northeastern Indian Ocean and is positioned below the Bengal region.

Persian Gulf: The Persian Gulf, also known as the Arabian Gulf, is a Mediterranean sea in West Asia. It is an extension of the Indian Ocean and is located between Iran and the Arabian Peninsula. The Gulf is connected to the Gulf of Oman through the Strait of Hormuz. Its northwest shoreline is formed by the Arvand or Shatt al-Arab river delta.

Red Sea: The Red Sea is a saltwater inlet located between Africa and Asia, connecting to the Indian Ocean through the Bab-el-Mandeb strait and the Gulf of Aden. To the north, it is bordered by the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez. It is part of the Great Rift Valley, underlain by the Red Sea Rift.

Timor Sea: The Timor Sea is a shallow sea in the Indian Ocean. It is bounded by Timor island to the north, Indonesia to the northwest, Arafura Sea to the east, and Australia to the south. The Sunda Trench marks its deepest point, separating Oceania and Asia. It is prone to earthquakes, tsunamis, and cyclones due to its location on the Ring of Fire and volcanic activity.

Pacific Ocean: The Pacific Ocean is the Earth's largest and deepest ocean, stretching from the Arctic to the Southern Ocean. It is surrounded by Asia, Oceania, and the Americas.

Gulf of Alaska: The Gulf of Alaska is a part of the Pacific Ocean, located along the southern coast of Alaska. It extends from the Alaska Peninsula and Kodiak Island in the west to the Alexander Archipelago in the east, encompassing Glacier Bay and the Inside Passage.

Bering Sea: The Bering Sea is a marginal sea in the Northern Pacific Ocean. It separates Eurasia from the Americas and is connected to the Arctic Ocean through the Bering Strait. The sea is named after Vitus Bering, a Danish navigator who explored it in 1728. It consists of a deep water basin that gradually slopes towards the continental shelves.

Gulf of California: The Gulf of California, also known as the Sea of Cortés, is a marginal sea of the Pacific Ocean separating Baja California Peninsula from mainland Mexico. It has a coastline of around 4,000 km and covers an area of about 160,000 km2. This region is bordered by the states of Baja California, Baja California Sur, Sonora, and Sinaloa. The gulf receives several rivers including the Colorado, Fuerte, Mayo, Sinaloa, Sonora, and Yaqui. Due to complex geology linked to plate tectonics, it reaches depths exceeding 3,000 meters.

Gulf of Carpentaria: The Gulf of Carpentaria is a sea off Australia's northern coast, enclosed by northern Australia on three sides. It is bounded by the Arafura Sea to the north. The northern boundary runs from Slade Point, Queensland to Cape Arnhem on the Gove Peninsula, Northern Territory.

Coral Sea: The Coral Sea is a marginal sea in the South Pacific off the northeast coast of Australia. It stretches 2,000 kilometers along the Australian northeast coast and is protected by the French Natural Park of the Coral Sea and the Australian Coral Sea Marine Park. The sea was the site of the Battle of the Coral Sea during World War II, involving the navies of Japan, the United States, and Australia.

East China Sea: The East China Sea is a marginal sea in the Western Pacific Ocean, located offshore from East China. It is known as the "East Sea" in China and internationally designated as the "East China Sea."

Sea of Japan: The Sea of Japan is a marginal sea enclosed by the Japanese archipelago, Sakhalin, the Korean Peninsula, and the Russian Far East. It is separate from the Pacific Ocean, resulting in minimal tides. This isolation affects its faunal diversity and salinity, which are lower compared to the open ocean. The sea lacks significant islands, bays, or capes. Its water balance is mainly influenced by inflow and outflow through neighboring straits and the Pacific Ocean. Rivers contribute less than 1% to water exchange.

Sea of Okhotsk: The Sea of Okhotsk is a marginal sea in the western Pacific Ocean. It is surrounded by Russia's Kamchatka Peninsula, the Kuril Islands, Japan's Hokkaido, Sakhalin Island, and eastern Siberian coast. It is named after the port of Okhotsk and is known for the Okhota River.

Philippine Sea: The Philippine Sea is the largest sea in the world, located east of the Philippine Archipelago. It covers an estimated surface area of 5 million square kilometers and is bordered by the first island chain to the west, including the Ryukyu Islands and Taiwan, and the second island chain to the east, including the Bonin Islands and Mariana Islands. Its northern border is formed by Japanese islands, while its southwestern border comprises Philippine islands. The sea is part of the Western Pacific Ocean and the Philippine Sea Plate forms its floor.

Seto Inland Sea: The Seto Inland Sea, also known as the Inland Sea, is a body of water in Japan that separates Honshu, Shikoku, and Kyushu. It serves as a connection between the Pacific Ocean and the Sea of Japan, linking industrial centers like Osaka and Kobe to the Kansai region. Previously, it was the primary transportation route between Kansai and Kyushu before the construction of the San'yō Main Line.

South China Sea: The South China Sea is a marginal sea in the Western Pacific Ocean. It is bounded by South China, the Indochinese Peninsula, Taiwan, the Philippines, and Indonesian islands. It covers an area of around 3,500,000 km2 and connects with the East China Sea, Philippine Sea, Sulu Sea, and Java Sea. The Gulf of Thailand and the Gulf of Tonkin are included in this region.

Gulf of Thailand: The Gulf of Thailand, or Gulf of Siam, is a shallow inlet in the South China Sea. It stretches 800 km in length and up to 560 km in width, covering 320,000 sq mi. Surrounded by Thailand, Cambodia, and Vietnam, it opens to the South China Sea in the southeast.

Tasman Sea: The Tasman Sea is a marginal sea in the South Pacific Ocean, located between Australia and New Zealand. It spans approximately 2,000 km (1,200 mi) across and 2,800 km (1,700 mi) from north to south. Named after Dutch explorer Abel Janszoon Tasman, who crossed it in 1642, it was extensively navigated by British explorer Lieutenant James Cook during his three voyages of exploration in the 1770s.

Yellow Sea: The Yellow Sea is a marginal sea in the Western Pacific Ocean, situated between mainland China and the Korean Peninsula. It is part of the East China Sea and derives its name from the golden-yellow color of the water, caused by silt carried by major rivers.

Southern Ocean: The Southern Ocean, also called Antarctic Ocean, is the world's southernmost ocean surrounding Antarctica below 60° S latitude. It covers an area of 20,327,000 km2, making it the second-smallest ocean after the Arctic. The Southern Ocean is experiencing significant climate change since the 1980s, resulting in alterations to its marine ecosystem.

Great Australian Bight: The Great Australian Bight is a vast open bay located along the southern coast of mainland Australia.

Ross Sea: The Ross Sea is the southernmost sea on Earth, located in Antarctica. It is a deep bay of the Southern Ocean and is named after British explorer James Clark Ross. The sea is surrounded by Victoria Land and Marie Byrd Land and is within the Ross Embayment. It is bordered by Ross Island and Victoria Land to the west, and by Roosevelt Island and Edward VII Peninsula in Marie Byrd Land to the east. The southernmost part of the sea is covered by the Ross Ice Shelf, approximately 200 miles from the South Pole. With an area of 637,000 square kilometers, as defined by the New Zealand National Institute of Water and Atmospheric Research, it is a significant body of water.

Scotia Sea: The Scotia Sea is a northern extension of the Southern Ocean, bordering the South Atlantic Ocean. It is enclosed by the Drake Passage to the west and the Scotia Arc, an undersea ridge with islands, to the north, east, and south. The sea is located on the Scotia Plate and was named after the expedition ship Scotia. It is known for the melting of numerous icebergs.

Weddell Sea: The Weddell Sea is a part of the Southern Ocean and is bordered by Coats Land and Antarctic Peninsula. It includes the Weddell Gyre and is home to the Filchner-Ronne Ice Shelf. Cape Norvegia marks its easternmost point, with the King Haakon VII Sea located beyond.

African Great Lakes: The African Great Lakes are a group of lakes found in and around the East African Rift Valley. They include Lake Victoria, the third-largest freshwater lake in the world, Lake Tanganyika, the second-largest freshwater lake by volume and depth, Lake Malawi, the eighth-largest freshwater lake, and Lake Turkana, the largest permanent desert and alkaline lake. Together, they hold more water than Lake Baikal or the North American Great Lakes and make up about 25% of the world's unfrozen surface fresh water. These lakes are home to a diverse range of species, with 10% of the world's fish species found in this region.

Lake Victoria: Lake Victoria is Africa's largest lake and the world's largest tropical lake. It has a surface area of about 59,947 square kilometers and a maximum depth of 80-81 meters. With a catchment area of 169,858 square kilometers, it contains about 2,424 cubic kilometers of water. The lake has a shoreline that spans 7,142 kilometers, with islands making up 3.7% of the total length.

Lake Tanganyika: Lake Tanganyika is Africa's second-oldest and second-largest freshwater lake, after Lake Baikal in Siberia. It is also the world's longest freshwater lake. Located in Eastern Africa, it is shared by Tanzania, the Democratic Republic of the Congo (DRC), Burundi, and Zambia, with Tanzania and DRC owning the majority of the lake. It drains into the Congo River system, which flows into the Atlantic Ocean.

Lake Malawi: Lake Malawi, also called Lake Nyasa or Lago Niassa, is the southernmost lake in the East African Rift. It is one of the African Great Lakes, spanning Malawi, Mozambique, and Tanzania.

Lake Turkana: Lake Turkana, formerly Lake Rudolf, is a vast alkaline lake located in the Kenyan Rift Valley and extending into Ethiopia. It holds the distinction of being the world's largest permanent desert lake and alkaline lake. In terms of volume, it ranks as the fourth-largest salt lake globally, following the Caspian Sea, Issyk-Kul, and Lake Van. Among all lakes, it stands as the 24th largest.

Lake Albert (Africa): Lake Albert is a large lake in Africa, found in Uganda and the Democratic Republic of the Congo. It is the seventh-largest lake in Africa and the second-largest among Uganda's Great Lakes.

Lake Chad: Lake Chad, located in West and Central Africa, is an endorheic freshwater lake at the junction of Nigeria, Niger, Chad, and Cameroon. It serves as an important wetland ecosystem in the region. The catchment area of Lake Chad spans 1 million square kilometers. In the past, the lake was much larger, covering an area of 28,000 square kilometers. Nonetheless, it has significantly shrunk due to climate change and human water diversion since the 1970s. Presently, its area fluctuates between 2,000 and 5,000 square kilometers.

Lake Kariba: Lake Kariba is the largest man-made lake and reservoir in the world, situated on the Zambezi River along the border of Zambia and Zimbabwe. It was created with the construction of the Kariba Dam, which led to the flooding of the Kariba Gorge, between 1958 and 1963.

Lake Mweru: Lake Mweru is a freshwater lake in Africa, situated on the border between Zambia and the Democratic Republic of the Congo. It is part of the Congo River system, spanning 110 kilometers of its length, between the Luapula River and Luvua River sections.

Lake Volta: Lake Volta is the world's largest artificial reservoir, created by the Akosombo Dam in Ghana. It spans 8,502 square kilometers and generates a significant portion of Ghana's electricity. The lake stretches from Akosombo in the south to the country's northern region.

Lake Vostok: Lake Vostok is the largest of Antarctica's known subglacial lakes. It is located beneath Russia's Vostok Station, at the southern Pole of Cold, underneath the central East Antarctic Ice Sheet. The lake is situated approximately 4,000 m below the ice surface and is about 500 m below sea level.

Aral Sea: The Aral Sea, located between Kazakhstan and Uzbekistan, experienced significant shrinkage starting in the 1960s and eventually dried up in the 2010s. It was situated in areas of Kazakhstan and Uzbekistan. The name "Aral Sea" refers to the numerous islands that were present in the sea. The Aral Sea drainage basin covers Uzbekistan and parts of Afghanistan, Iran, Kazakhstan, Kyrgyzstan, Tajikistan, and Turkmenistan.

Lake Baikal: Lake Baikal is a massive rift lake in Russia, located in southern Siberia. It is the world's seventh-largest lake by surface area, covering 31,722 km2. With its maximum depth of 1,642 metres, it is also the world's deepest lake. Remarkably, it holds a staggering volume of freshwater, making it the largest freshwater lake by volume, containing 23,615.39 km3 of water. This accounts for about 22-23% of the planet's fresh surface water, exceeding the combined volume of all the North American Great Lakes. Notably, Lake Baikal is the oldest lake, estimated to be 25-30 million years old, and it possesses exceptional clarity.

Lake Balkhash: Lake Balkhash is a large lake in southeastern Kazakhstan. It is one of the biggest in Asia and the 15th largest globally. Situated in the Balkhash-Alakol Basin, it is an enclosed basin that receives water from seven rivers, including the Ili which brings most of the inflow. The Ili is fed by precipitation, mainly vernal snowmelt from China's Xinjiang region.

Caspian Sea: The Caspian Sea is the world's largest inland body of water, located between Europe and Asia. It is often referred to as both the largest lake and a sea. Covering an area of 371,000 km2, it has a volume of 78,200 km3. The Caspian Sea has a salinity of approximately 1.2%, much less than that of average seawater. It is surrounded by countries like Russia, Kazakhstan, Azerbaijan, Turkmenistan, and Iran.

Dead Sea: The Dead Sea is a salt lake bordered by Jordan and the Israeli-occupied West Bank and Israel. It is located in the Jordan Rift Valley and the Jordan River feeds into it.

Issyk-Kul: Issyk-Kul is a saline lake located in eastern Kyrgyzstan, close to the border with Kazakhstan. It is the seventh-deepest and third-largest saline lake in the world, known as the "warm lake" due to its rare lack of freezing despite its high elevation.

Poyang Lake: Poyang Lake is China's largest freshwater lake, situated in Jiujiang.

Qinghai Lake: Qinghai Lake, the largest lake in China, is an alkaline salt lake located in Qinghai Province. Despite experiencing fluctuations in size, it has been increasing since 2004. It covers an area of 4,317 km2 (1,667 sq mi), has an average depth of 21 m (69 ft), and reaches a maximum depth of 25.5 m (84 ft) as of 2008.

Lake Urmia: Lake Urmia is a significant salt lake in Iran, located between the provinces of East Azerbaijan and West Azerbaijan. It used to be the biggest lake in the Middle East and the sixth-largest saltwater lake globally, with a surface area of around 5,200 km2. The lake has a length of 140 km, a width of 55 km, and can reach a maximum depth of 16 m.

Lake Van: Lake Van is Turkey's largest lake located in the eastern part of the country. It is a saline soda lake surrounded by mountains and receives water from various streams. With an area greater than 3,000 square kilometers, it contains 38% of Turkey's surface water. A volcanic eruption in ancient times blocked its original outlet. Situated at a high altitude of 1,640 meters, the lake's high salinity prevents it from freezing, although the northern section may occasionally freeze.

West Lake: West Lake is a freshwater lake in Hangzhou, China, divided into five sections by three causeways. It encompasses temples, pagodas, gardens, and natural/artificial islands. Gushan is the largest natural island, while Xiaoyingzhou, Huixin Pavilion, and Ruan Gongdun are the three artificial islands. Leifeng Pagoda and Baochu Pagoda are prominent attractions. The lake's layout forms a pattern of "one mountain, two towers, three islands, three banks, and five lakes."

Lake Ladoga: Lake Ladoga is a freshwater lake in northwestern Russia near Saint Petersburg. It is situated in the Republic of Karelia and Leningrad Oblast.

Lake Onega: Lake Onega is the second-largest lake in Europe, located in northwest Russia. It is situated within the Republic of Karelia, Leningrad Oblast, and Vologda Oblast. This basin of the Baltic Sea is fed by numerous rivers and drained by the Svir.

Vänern: Vänern is Sweden's largest lake and the biggest one in the European Union. It is situated in the southwest of the country, spanning the provinces of Västergötland, Dalsland, and Värmland. With a surface elevation of 44 meters and a maximum depth of 106 meters, it reaches a depth of 62 meters below sea level. The average depth is 28 meters, keeping the majority of the lake floor above sea level.

Great Lakes: The Great Lakes are a group of large freshwater lakes in North America. They are connected to the Atlantic Ocean through the Saint Lawrence River. The five lakes—Superior, Michigan, Huron, Erie, and Ontario—are located near the border between Canada and the United States. Michigan and Huron are joined together at the Straits of Mackinac. The Great Lakes Waterway allows for efficient water travel and shipping between the lakes.

Lake Superior: Lake Superior is the world's largest freshwater lake by surface area and volume, containing 10% of the world's fresh water. It is located in central North America, bordering the Canadian province of Ontario and the US states of Minnesota, Michigan, and Wisconsin. The lake drains into Lake Huron through the St. Marys River, connecting to the Atlantic Ocean via the St. Lawrence River.

Lake Michigan: Lake Michigan is one of the five Great Lakes of North America, ranking second in volume and third in surface area. It is connected to Lake Huron through the Straits of Mackinac, and both lakes share the same surface elevation.

Lake Huron: Lake Huron is one of the five Great Lakes of North America. It is connected to Lake Michigan by the Straits of Mackinac. It is shared by Ontario, Canada to the north and east, and Michigan, USA to the south and west. The name comes from French explorers who named it after the Huron people who lived there.

Lake Erie: Lake Erie is the fourth-largest of the Great Lakes and eleventh-largest globally. It is the southernmost and shallowest with the shortest average water residence time. With a maximum depth of 210 feet, it is the only Great Lake with its deepest point above sea level.

Lake Ontario: Lake Ontario is a Great Lake located between Ontario, Canada and New York, USA. The lake is bordered by Ontario to the north, west, and southwest, and New York to the south and east. It also marks a part of the Canada-US border.

Great Bear Lake: Great Bear Lake is the largest lake in Canada and the fourth-largest in North America. Located on the Arctic Circle in the boreal forest of Canada's Northwest Territories, it sits at an elevation of 156 m (512 ft) above sea level.

Great Slave Lake: Great Slave Lake is the second-largest lake in the Northwest Territories of Canada, covering an area of 27,200 km2. It is the deepest lake in North America, with a maximum depth of 614 m. The lake is 469 km long and has a width that varies from 20 to 203 km. Its volume is estimated to range from 1,070 to 2,088 km3, making it one of the largest lakes in the world by volume.

Lake Nicaragua: Lake Nicaragua, also known as Cocibolca or Granada, is the largest freshwater lake in Central America, covering an area of 8,264 square kilometers. With an elevation of 32.7 meters above sea level, it reaches a depth of 26 meters. The lake is of tectonic origin and is the 19th largest lake in the world and the tenth largest in the Americas. It is intermittently connected to Lake Managua by the Tipitapa River.

Lake Winnipeg: Lake Winnipeg is a large, shallow lake in Manitoba, Canada. It is the country's sixth-largest freshwater lake and the third-largest contained entirely within Canada. The lake's eastern side is home to pristine boreal forests and rivers that have been declared a UNESCO World Heritage Site. With remote sandy beaches, limestone cliffs, and numerous bat caves, the lake stretches 416 km and boasts many undeveloped islands. Additionally, Manitoba Hydro utilizes the lake as one of the largest reservoirs in the world.

Lake Eyre: Lake Eyre, also known as Kati Thanda–Lake Eyre, is an endorheic lake located in South Australia. It is the lowest natural point in Australia, lying approximately 15 m (49 ft) below sea level. When full, it becomes the largest lake in Australia, covering up to 9,500 km2 (3,668 sq mi). The lake's salinity is comparable to seawater but becomes hypersaline as water evaporates.

Lake Maracaibo: Lake Maracaibo is a brackish lake in northwestern Venezuela, between the states of Zulia, Trujillo, and Mérida. It is a semi-enclosed bay off the coast of the Gulf of Venezuela. Although it is commonly called a lake, its geological characteristics suggest otherwise. It is the largest lake in South America, covering an area of 13,512 km2 (5,217 sq mi), and is one of the oldest on Earth, originating around 36 million years ago in the Andes Mountains.

Lake Titicaca: Lake Titicaca is a vast freshwater lake located in the Andes mountains on the Bolivia-Peru border. Known as the highest navigable lake globally, it is also the largest in South America in terms of both water volume and surface area.

Congo River: The Congo River, also known as the Zaire River, is Africa's second-longest river after the Nile. It ranks as the world's third-largest river in terms of discharge volume, surpassed only by the Amazon and Ganges rivers. With depths of around 220 m (720 ft), it holds the record as the world's deepest river. The Congo-Lualaba-Chambeshi River system stretches for a total of 4,700 km (2,900 mi), making it the ninth-longest river globally. The river's name changes to Lualaba upstream of Boyoma Falls, and it extends for 1,800 km (1,100 mi) under this name.

Ubangi River: The Ubangi River, also spelled Oubangui, is the largest tributary of the Congo River in Central Africa. It starts at the confluence of the Mbomou and Uele Rivers and serves as the border between the Central African Republic (CAR) and the Democratic Republic of the Congo. It then flows through the CAR capital of Bangui before becoming the border between the Democratic Republic of the Congo and the Republic of the Congo. Finally, it merges with the Congo River at Liranga.

Limpopo River: The Limpopo River is a 1,750km long river that begins in South Africa and flows eastward through Mozambique to the Indian Ocean. It is named after a group of Tsonga settlers led by Hosi Rivombo. The river is also referred to as Vhembe by local Venda communities. It has a drainage basin of 415,000 square kilometers and a mean discharge of 170 m3 per second at its mouth. The Limpopo River is the second largest river in Africa that empties into the Indian Ocean.

Niger River: The Niger River is a major river in West Africa, stretching 4,180 km. It flows through Guinea, Mali, Niger, Nigeria, and discharges into the Gulf of Guinea. It has a vast drainage basin of 2,117,700 km2 and forms the Niger Delta. The river is the third-longest in Africa, and its main tributary is the Benue River.

Nile: The Nile is a major north-flowing river in northeastern Africa that flows into the Mediterranean Sea. It is historically considered the longest river in the world. It stretches for about 6,650 km and passes through eleven countries. The Nile is the primary water source for Egypt, Sudan, and South Sudan, and supports agriculture and fishing.

Blue Nile: The Blue Nile is a river in Ethiopia and Sudan, originating from Lake Tana. It is a major tributary of the Nile, supplying 85.6% of the Nile's water during the rainy season. It travels around 1,450 km (900 mi) through both countries.

White Nile: The White Nile is a major African river, which, along with the Blue Nile, forms the Nile river system. Its name derives from the clay sediment in its water, giving it a light hue.

Orange River: The Orange River is the longest river in South Africa, spanning 2,432 km. It flows westward from the Drakensberg mountains in Lesotho, forming part of the international borders between South Africa and Lesotho, and between South Africa and Namibia. It provides water for irrigation and hydroelectric power, playing a vital role in the South African economy. Named after the Dutch ruling family, it does not pass through major cities except for Upington. Alternative names include Gariep River and Senqu River.

Senegal River: The Senegal River is a 1086 km long river in West Africa, serving as a border between Senegal and Mauritania. It has a large drainage basin of 270000 km2 and a significant flow of 680 m3/s. The river has important tributaries including the Falémé, Karakoro, and Gorgol Rivers. Upon passing Kaédi, it splits into two branches, rejoining after 200 km downstream of Podor.

Zambezi: The Zambezi is Africa's fourth-longest river, flowing eastward and into the Indian Ocean. It covers a drainage basin of 1,390,000 km2, slightly smaller than the Nile's. The river stretches 2,574 kilometers, running through Zambia, Angola, Namibia, Botswana, Zimbabwe, and Mozambique. Finally, it empties into the Indian Ocean.

Amur: The Amur River is a lasting river in Northeast Asia, serving as the natural border between the Russian Far East and Northeast China. It spans 2,824 km, making it the world's tenth longest river, and has a drainage basin of 1,855,000 km2.

Songhua River: The Songhua River, located in China, is the longest tributary of the Amur and spans approximately 1,897 km (1,179 mi). Originating from the Changbai Mountains on the China-North Korea border, it flows through the Jilin and Heilongjiang provinces in northeastern China.

Pearl River: The Pearl River is an extensive river system in southern China that flows into the South China Sea through the Pearl River Delta. It is China's third-longest river and second largest by volume, after the Yangtze. The Pearl River Basin drains Guangdong and Guangxi provinces, as well as parts of Yunnan, Guizhou, Hunan, and Jiangxi. It also extends into Vietnam. The Pearl River is known for flowing through Guangzhou.

Yangtze: The Yangtze, also known as Yangzi or Changjiang, is the longest river in Eurasia and the third longest globally. It flows entirely within China, starting at Jari Hill in the Tibetan Plateau and stretching for 6,300 km in an easterly direction to the East China Sea. The river ranks as the fifth largest in terms of discharge volume worldwide. Its extensive drainage basin covers a fifth of China's land area and is home to nearly a third of the country's population.

Yellow River: The Yellow River is the second longest river in China, stretching over 5,464 km (3,395 mi) from the Bayan Har Mountains to the Bohai Sea. It is known as the birthplace of ancient Chinese civilization.

Irrawaddy River: The Irrawaddy River is Myanmar's largest river, flowing from north to south. It serves as an important commercial waterway and originates from the N'mai and Mali rivers. The river follows a relatively straight path before emptying into the Andaman Sea through the Irrawaddy Delta. It has a vast drainage basin covering a significant portion of Burma. Additionally, it is sometimes nicknamed "The Road to Mandalay" after Rudyard Kipling's poem.

Mekong: The Mekong River is a trans-boundary river in East and Southeast Asia. It is the third-longest river in Asia, running through China, Myanmar, Laos, Thailand, Cambodia, and Vietnam. Despite its seasonal variations, it serves as a key trade route between Tibet and Southeast Asia. However, the construction of hydroelectric dams is causing significant issues for the river's ecosystem, including worsening droughts.

Salween River: The Salween River is a long Southeast Asian river, flowing from Tibet to the Andaman Sea. It runs through China and Myanmar, with a short section forming the Myanmar-Thailand border. The river is swift and passes through rugged canyons, and it is only navigable for the last 90 km at its modest estuary and delta in Mawlamyine. It is known as Thanlwin in Burma and Nu Jiang in China, with "Salween" being the anglicized version of the Burmese name.

Ganges: The Ganges is a trans-boundary river in Asia that flows through India and Bangladesh. Rising in the Himalayas, it flows through the Gangetic plain, receiving tributaries from Nepal. In India, a canal diverts 50% of its flow to the Hooghly River. In Bangladesh, it becomes the Padma and joins the Jamuna and Meghna rivers, forming the Ganges Delta. This river system is the second-largest in the world by discharge.

Yamuna: The Yamuna is India's longest tributary river, originating from the Yamunotri Glacier. It spans 1,376 km with a vast drainage area of 366,223 sq km. It merges with the Ganges at Triveni Sangam, Prayagraj, a significant site for the Hindu festival, Kumbh Mela.

Brahmaputra River: The Brahmaputra River is a trans-boundary river flowing through Tibet, India, and Bangladesh. It is also known as Luit, Yarlung Tsangpo, Siang/Dihang River, and Jamuna River. It ranks as the 9th largest river in the world by discharge and the 15th longest.

Godavari River: The Godavari River is India's second longest river, draining into the third largest basin in the country. It originates in Trimbakeshwar, Maharashtra and flows east for 1,465 kilometers, passing through multiple states including Telangana, Andhra Pradesh, and Odisha. It ultimately empties into the Bay of Bengal through an extensive network of distributaries. With a large catchment area of 312,812 square kilometers, it forms one of the largest river basins in India, after the Ganga and Indus rivers. Known as the Dakshina Ganga, it is the largest river in peninsular India in terms of length, catchment area, and discharge.

Indus River: The Indus River is a transboundary river in Asia that flows through South and Central Asia. It originates in mountain springs in Western Tibet, passes through the disputed region of Kashmir, and continues southwards into Pakistan before reaching the Arabian Sea near Karachi.

Krishna River: The Krishna River is the third-longest river in India, spanning 1,400 kilometers (870 mi) and flowing through the Deccan plateau. It is known as Krishnaveni and its length in Maharashtra is 282 kilometers. With significant water inflows and a large river basin area, it ranks fourth in India. This river plays a crucial role in irrigation, benefiting the states of Maharashtra, Karnataka, Telangana, and Andhra Pradesh.

Lena (river): The Lena is a Russian Far East river, one of the three Siberian rivers that flow into the Arctic Ocean. It is the longest river entirely within Russia, spanning 4,294 km, and has a large drainage basin of 2,490,000 km2. The majority of its catchment area is underlain by permafrost.

Ob (river): The Ob River is a major river in Russia, flowing through western Siberia. It is part of the seventh-longest river system globally, measuring 5,410 kilometers in length. Originating from the Altai Mountains, it forms at the confluence of the Biya and Katun rivers. The Ob River is the westernmost of the three main Siberian rivers that empty into the Arctic Ocean. Its flow direction is northwest and then north.

Irtysh: The Irtysh is a major river in Russia, China, and Kazakhstan. It holds the distinction of being the longest tributary river globally, as it feeds into the Ob River.

Ural (river): The Ural (or Yaik) is a river in Russia and Kazakhstan that marks the border between Europe and Asia. It begins in the southern Ural Mountains and ends in the Caspian Sea. With a length of 2,428 kilometers (1,509 mi), it is the third longest river in Europe and the 18th longest in Asia. The Ural is widely recognized as the boundary separating Europe and Asia.

Yenisey: The Yenisey is a major river system and the world's fifth-longest. It empties into the Arctic Ocean, making it the largest river to do so.

Angara: The Angara is a major river in Siberia, flowing through Irkutsk Oblast and Krasnoyarsk Krai in Russia. It originates from Lake Baikal and is the primary tributary of the Yenisey. With a length of 1,849 km, it has a large drainage basin of 1,039,000 square km. Previously, it was referred to as the Lower Angara and, before its junction with the Ilim, as the Upper Tunguska, with names later reversed.

Euphrates: The Euphrates is a vital river in Western Asia, flowing through Turkey, Syria, and Iraq. Together with the Tigris, it forms the core of Mesopotamia. It ultimately joins the Tigris to flow into the Shatt al-Arab before reaching the Persian Gulf.

Jordan River: The Jordan River, also called Nahr Al-Sharieat, is a 251-kilometre-long river flowing from the Sea of Galilee to the Dead Sea in the Middle East. It serves as the border between Jordan and the occupied West Bank, with Jordan and the Golan Heights on its east and Israel on its west. The river is significant as both Jordan and the West Bank derive their names from it.

Tigris: The Tigris is one of the main rivers in Mesopotamia, alongside the Euphrates. Originating from the Taurus Mountains in Turkey, it passes through the Syrian and Arabian Deserts before reaching the Persian Gulf.

Amu Darya: The Amu Darya is a major river in Central Asia and Afghanistan, also known as Amu and Amo. Its ancient name was Oxus. The river begins in the Pamir Mountains and is formed by the Vakhsh and Panj rivers on the Afghanistan-Tajikistan border. It flows northwest into the remnants of the Aral Sea. The Amu Darya forms part of Afghanistan's northern border and was historically seen as the boundary between Greater Iran and Turan. It has an average flow of 70 cubic kilometers per year.

Syr Darya: The Syr Darya, also called Jaxartes, is a Persian-named river in Central Asia. Originating in the Tian Shan Mountains, it flows through Kyrgyzstan, Uzbekistan, and Kazakhstan for 2,256.25 km. It is one of the main rivers in the Aral Sea basin, along with the Amu Darya.

Elbe: The Elbe is a significant river in Western Europe, flowing through the Czech Republic, Germany, and eventually emptying into the North Sea. With a length of 1,094 km (680 mi), it starts in the Giant Mountains and passes through Bohemia before reaching its final destination at Cuxhaven, 110 km northwest of Hamburg.

Danube: The Danube is Europe's second-longest river, flowing through Central and Southeastern Europe. It served as a significant frontier of the Roman Empire and now connects ten European countries. Originating in Germany, it passes through Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine. The river is home to four national capitals, including Vienna and Budapest. It has an extensive drainage basin of 817,000 km², extending into nine more countries.

Dnieper: The Dnieper, also known as Dnipro, is a major European river that starts in Russia, flows through Belarus and Ukraine, and reaches the Black Sea. It is approximately 2,200 km long, making it the longest river in Ukraine and Belarus, and the fourth-longest in Europe. The Dnieper has a vast drainage basin of 504,000 square kilometers and is an important transboundary waterway.

Don (river): The Don is a major river in Russia, flowing from Central Russia to the Sea of Azov. It is the fifth-longest river in Europe and has historically been significant for trade between Byzantine Empire traders.

Loire: The Loire is the longest river in France, spanning 1,006 km. It covers a vast area of 117,054 km², accounting for more than a fifth of France's land. However, its average discharge is only half that of the Rhône.

Neva: The Neva is a river in northwestern Russia that flows from Lake Ladoga to the Gulf of Finland. It has a length of 74 kilometres and is the fourth-largest river in Europe in terms of average discharge.

Pechora (river): The Pechora is a major European river originating in Northwest Russia. It ranks as the sixth-longest river in the continent, while its course spans the Komi Republic and a portion of the Nenets Autonomous Okrug. Ultimately, it flows into the Arctic Ocean.

Rhine: The Rhine is a major European river that starts in the Swiss Alps and forms borders between Switzerland, Liechtenstein, Austria, and Germany. It then becomes the Franco-German border and flows north through the German Rhineland. After turning west, it empties into the North Sea in the Netherlands. The river covers an area of 9,973 sq km and its name comes from the Celtic Rēnos. It has also inspired the names of two German states, North Rhine-Westphalia and Rhineland-Palatinate.

Vistula: The Vistula is Poland's longest river and the ninth-longest in Europe, spanning 1,047 kilometers. With a vast drainage basin of 193,960 km2, it extends into three other countries and encompasses 168,868 km2 within Poland alone.

Volga: The Volga is Europe's longest river, flowing through Russia from Central to Southern regions and emptying into the Caspian Sea. With a length of 3,531 km and a massive catchment area of 1,360,000 km2, it is also Europe's largest river in terms of average discharge and drainage basin. Known as the national river of Russia, it has played a significant role in the history of the region, serving as a meeting point for different civilizations.

Tagus: The Tagus is the longest river in the Iberian Peninsula, flowing for 1,007 km (626 mi) from the Montes Universales in Spain to the Atlantic Ocean in Lisbon, Portugal.

River Thames: The River Thames is a long river in southern England, including London. It is the longest river entirely within England and the second-longest in the UK.

Rio Grande: The Rio Grande is a major river in the southwestern United States and northern Mexico. It stretches for 1,896 miles (3,051 km) and is the 4th longest river in the United States and North America. Originating in Colorado, it flows to the Gulf of Mexico. The river's watershed covers 182,200 square miles (472,000 km2), but additional basins increase the total to 336,000 square miles (870,000 km2).

Mackenzie River: The Mackenzie River is a major river in Canada, flowing through the boreal forest. It forms the longest river system in the country, along with the Slave, Peace, and Finlay rivers. With the second largest drainage basin in North America after the Mississippi, it is a significant waterway.

St. Lawrence River: The St. Lawrence River is a major river connecting the Great Lakes to the North Atlantic Ocean. It flows from Lake Ontario to the Gulf of St. Lawrence, passing through Ontario, Quebec, and New York. It also serves as a border between Canada and the United States.

Yukon River: The Yukon River is a major watercourse in northwest North America. It originates in British Columbia, Canada, and flows through Yukon territory. It then continues through Alaska, before emptying into the Bering Sea at the Yukon-Kuskokwim Delta. This 3,190 km long river has an average flow of 6,400-7,000 m3/s and covers a drainage area of 833,000 km2, with a significant portion in Canada. The total area it spans is more than 25% larger than Texas or Alberta.

Colorado River: The Colorado River is a major river in the Southwestern United States and Mexico, spanning 1,450 miles. It is the 5th longest river in the US and flows through seven states and two Mexican states. The river gets its name from its reddish color due to a high silt content. Originating in the Colorado Rockies, it flows southwest across the Colorado Plateau and through the Grand Canyon before reaching Lake Mead. Eventually, it reaches the mostly dry Colorado River Delta at the tip of the Gulf of California.

Columbia River: The Columbia River is the largest river in the Pacific Northwest and stretches from British Columbia, Canada to the Pacific Ocean. It forms most of the border between Washington and Oregon, covering a distance of 1,243 miles. With its largest tributary being the Snake River, it boasts a vast drainage basin that extends into seven U.S. states and one Canadian province, roughly the size of France. Known as the fourth-largest river in the United States by volume, it holds the highest flow of any river entering the Pacific outside of Asia and is the 36th largest in the world.

Mississippi River: The Mississippi River, the second-longest river in the US, flows for 2,340 miles from Lake Itasca in Minnesota to the Mississippi River Delta in the Gulf of Mexico. Its vast watershed covers parts of 32 US states and two Canadian provinces. With a total drainage basin of 1,151,000 sq mi, the Mississippi ranks thirteenth globally in terms of discharge. It borders or passes through several states including Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana.

Missouri River: The Missouri River is the longest river in the United States, spanning 2,341 miles. It starts in Montana's eastern Centennial Mountains and flows east and south before joining the Mississippi River near St. Louis. This river has a vast watershed covering over 500,000 square miles, including parts of ten U.S. states and two Canadian provinces. Despite being a tributary, it is slightly longer than the Mississippi and carries a comparable amount of water. When combined with the lower Mississippi, it creates the world's fourth-longest river system.

Ohio River: The Ohio River is a 981-mile long river in the United States, flowing from western Pennsylvania to the southern tip of Illinois. It serves as a boundary between the Midwestern and Southern regions. As the largest tributary of the Mississippi River, it ranks third in discharge volume and is the sixth oldest river in North America. The river spans six states and its basin includes parts of 14 states. Additionally, it provides drinking water for approximately five million people.

Murray River: The Murray River is Australia's longest river, spanning 2,508 km. It flows through Southeastern Australia and is part of the Murray-Darling basin, which is a vital irrigated region. The river's tributaries include five of Australia's other longest rivers.

Amazon River: The Amazon River in South America is the world's largest river in terms of water flow and forms the longest river system. Its status as the longest river system has been challenged by those who argue that the Nile holds this title.

Madeira River: The Madeira River is a major waterway in South America and the biggest tributary of the Amazon, contributing about 15% of its water. It is estimated to be 1,450 km (900 mi) in length and is formed by the convergence of two large rivers near its mouth. It was historically known as the River of Cuyari and plays a significant role in the region's history and transportation.

Rio Negro (Amazon): The Rio Negro, also known as Guainía, is the largest left tributary of the Amazon River. It is the world's largest blackwater river and ranks among the ten largest rivers based on average discharge.

Tocantins River: The Tocantins River is a central river in Brazil, flowing from south to north for approximately 2,450 km. Its name means "toucan's beak" in the Tupi language. It is not a branch of the Amazon River, but its waters join the Amazon's as they both flow into the Atlantic Ocean. The Tocantins River passes through four Brazilian states and gave rise to a new state named after it in 1988, previously part of Goiás.

Magdalena River: The Magdalena River is Colombia's primary river, spanning 1,528 kilometers through the western half of the country. It is named after Mary Magdalene and is navigable except for sand bars near its delta. The river flows through the Magdalena River Valley.

Orinoco: The Orinoco is a long river in South America, with a length of 2,250 km. It has a large drainage basin covering 989,000 km2, mostly in Venezuela. It is the fourth largest river in the world by water discharge. The Orinoco River serves as a crucial transportation system in Venezuela and Colombia. The basin is home to a diverse environment and wildlife.

Paraná River: The Paraná River is a major river in South America, flowing through Brazil, Paraguay, and Argentina. It spans about 4,880 kilometers, making it the second longest river in South America after the Amazon. It joins the Paraguay River and later merges with the Uruguay River to form the Río de la Plata, ultimately emptying into the Atlantic Ocean.

Río de la Plata: The Río de la Plata is the estuary formed by the Uruguay River and the Paraná River. It empties into the Atlantic Ocean and creates a funnel-shaped indentation on South America's southeastern coastline. It is debated whether it is a river, estuary, gulf, or marginal sea, and if considered a river, it is the widest in the world reaching up to 220 kilometers (140 mi) wide.

São Francisco River: The São Francisco River, also known as "Velho Chico," is the longest river in Brazil, spanning 2,914 kilometers. It was formerly called Opara by indigenous peoples and now runs entirely within Brazilian territory.

Uruguay River: The Uruguay River is a major river in South America, forming parts of the boundaries of Brazil, Argentina, and Uruguay. It flows from north to south, separating Argentine provinces from the other two countries. It passes through Brazilian states and borders several provinces in Argentina, as well as departments in Uruguay.

Gulf of Aden: The Gulf of Aden is a deepwater gulf located in the Indian Ocean, bordered by Yemen, the Arabian Sea, Djibouti, and Somalia. It connects with the Red Sea through the Bab-el-Mandeb strait and narrows into the Gulf of Tadjoura. The Aden Ridge in the middle of the Gulf is causing it to widen gradually.

Bass Strait: Bass Strait is a strait that separates Tasmania from mainland Australia, serving as the primary water passage between the Great Australian Bight and the Tasman Sea. It is the sole maritime route leading to Port Phillip Bay, a significant economic hub.

Bering Strait: The Bering Strait is a narrow passage between the Pacific and Arctic oceans, dividing the Chukchi Peninsula of Russia from Alaska's Seward Peninsula. It marks the maritime boundary between Russia and the United States, situated just south of the Arctic Circle. The strait is named after Vitus Bering, a Danish explorer employed by the Russian Empire.

Bosporus: The Bosporus is a strait in Istanbul, Turkey, connecting the Black Sea to the Sea of Marmara. It acts as a boundary between Asia and Europe, separating Anatolia from Thrace. It is the narrowest strait used for international navigation.

Cook Strait: Cook Strait is a treacherous body of water that separates New Zealand's North and South Islands, connecting the Tasman Sea to the northwest with the South Pacific Ocean to the southeast. Known for its danger and unpredictability, this 22-kilometre wide strait is recognized as one of the most hazardous waters globally. Despite its challenges, regular ferry services operate between Wellington and Picton, providing a crucial transportation link.

Dardanelles: The Dardanelles is a narrow and important waterway in northwestern Turkey, separating Asian and European Turkey. It is also known as the Strait of Gallipoli and Hellespont in Classical Antiquity. The Dardanelles forms part of the continental boundary between Asia and Europe, and along with the Bosporus, it creates the Turkish Straits.

Strait of Dover: The Strait of Dover, also known as Dover Strait, is the narrowest part of the English Channel, separating Great Britain from continental Europe. It spans approximately 20 miles from the South Foreland in England's Kent county to Cap Gris Nez near Calais in France. The strait is a popular route for cross-channel swimmers. It falls within the territorial waters of both France and the United Kingdom, but allows free movement for vessels of other nations under the United Nations Convention on the Law of the Sea.

Drake Passage: The Drake Passage is a stretch of water connecting the Atlantic and Pacific Oceans, located between Cape Horn and the South Shetland Islands. It is named after Sir Francis Drake, a 16th-century explorer.

English Channel: The English Channel, or simply the Channel, is a body of water that separates Southern England from northern France. It connects to the North Sea through the Strait of Dover and is the world's busiest shipping area.

Straits of Florida: The Straits of Florida is a strait located between the Gulf of Mexico and the Atlantic Ocean, separating the Florida Keys and Cuba. It is 93 mi (150 km) wide at the narrowest point and reaches a depth of 6,000 feet (1,800 m). The strait serves as the pathway for the Florida Current, the starting point of the Gulf Stream.

Strait of Gibraltar: The Strait of Gibraltar is a narrow passage that links the Atlantic Ocean and the Mediterranean Sea, dividing Europe from Africa.

Strait of Hormuz: The Strait of Hormuz is a highly strategic choke point connecting the Persian Gulf and Gulf of Oman. It is the only sea passage from the Persian Gulf to the open ocean. It spans about 90 nautical miles and is located between Iran and the Musandam peninsula, which is shared by the UAE and Oman. Its width ranges from 21 to 52 nautical miles.

Kattegat: The Kattegat is a 30,000 km2 sea area located between the Jutlandic peninsula and the Danish Straits in the west, and the provinces of Sweden in the east. It acts as a drainage outlet for the Baltic Sea via the Danish Straits. Considered a continuation of the Skagerrak, it is traditionally not considered a bay of the North Sea.

Korea Strait: The Korea Strait is a sea passage connecting the East China Sea, Yellow Sea, and Sea of Japan. It is split by Tsushima Island into the Western Channel and Eastern Channel. The strait is economically important and allows free passage for shipping between Japan and Korea. It has historical significance in terms of Buddhism, Mongol invasions, and the Battle of Korea Strait in the Korean War. There is a proposal for a Japan-Korea Undersea Tunnel to connect the countries.

Strait of Magellan: The Strait of Magellan is a sea route in southern Chile that separates mainland South America from Tierra del Fuego. It is the most important natural passage between the Atlantic and Pacific Oceans. Indigenous peoples, such as the Kawésqar, had been navigating the strait for thousands of years. It is approximately 570 km long and 2 km wide at its narrowest point. In 1520, Ferdinand Magellan's expedition became the first Europeans to discover it.

Strait of Malacca: The Strait of Malacca is a narrow waterway between the Indonesian island of Sumatra and the Malay Peninsula, connecting the Andaman Sea with the South China Sea. It is a vital shipping route, spanning 500 miles in length, and ranging from 40 to 155 miles wide. Named after the Malaka tree, it serves as a key channel for maritime trade between the Indian Ocean and South China Sea.

Mozambique Channel: The Mozambique Channel is a stretch of the Indian Ocean found between Madagascar and Mozambique. It is approximately 1,700 km long and 419 km wide at its narrowest point. The channel has a depth of 3,292 m about 230 km off the coast of Mozambique. It is influenced by the warm Mozambique Current, which flows southward and joins the Agulhas Current along the east coast of Southern Africa.

Palk Strait: The Palk Strait is a narrow strip of water between India's Tamil Nadu state and Sri Lanka's Northern Province. It connects the Bay of Bengal with Palk Bay, spanning 40 to 85 miles in width and 85 miles in length. It has a maximum depth of less than 9.1 m. The strait is named after Robert Palk, a former governor of Madras. Numerous rivers, including Tamil Nadu's Vaigai River, flow into it.

Skagerrak: Skagerrak is a strait that connects the North Sea and the Kattegat sea. It runs between the Jutland peninsula in Denmark, the west coast of Sweden, and the east coast of Norway.

Taiwan Strait: The Taiwan Strait is a 180-km wide strait that separates Taiwan from mainland Asia. It is located in the South China Sea and connects to the East China Sea in the north. The strait's narrowest section measures 130 km wide.

Erie Canal: The Erie Canal, completed in 1825, is a historic canal in upstate New York that connected the Hudson River to Lake Erie. It was the first waterway linking the Atlantic Ocean to the Great Lakes, leading to significant reductions in transportation costs across the Appalachians. The canal played a crucial role in accelerating the settlement of the Great Lakes region, promoting westward expansion in the United States, and boosting New York State's economic growth. It is often referred to as "The Nation's First Superhighway."

Grand Canal (China): The Grand Canal in China is the world's longest canal and a UNESCO World Heritage Site. It stretches for 1,776 km, passing through six main sections and connecting various rivers and lakes. It spans across several provinces and municipalities, including Zhejiang, Jiangsu, Shandong, Hebei, Tianjin, and Beijing. Parts of the Eastern Zhejiang Canal and the Tongji and Yongji Canals are also recognized as components of the Grand Canal.

Kiel Canal: The Kiel Canal is a 98 km long canal connecting the North Sea to the Baltic Sea in the German state of Schleswig-Holstein. It was completed in 1895 and offers a shortcut of 460 km, saving time and avoiding rough seas and Danish straits.

Panama Canal: The Panama Canal is a 51-mile waterway in Panama that connects the Atlantic and Pacific Oceans. It cuts across the Isthmus of Panama and facilitates maritime trade. The canal includes locks that lift ships up to Gatun Lake, a man-made freshwater lake. It uses 200 million liters of fresh water for each ship passing through.

St. Lawrence Seaway: The St. Lawrence Seaway is a system of locks, canals, and channels connecting the Atlantic Ocean to the Great Lakes of North America. It allows oceangoing vessels to reach ports in all five Great Lakes, as far inland as Duluth, Minnesota. The seaway extends from Montreal to Lake Erie, including the Welland Canal. It is named after the St. Lawrence River, which flows from Lake Ontario to the Atlantic Ocean.

Suez Canal: The Suez Canal is a man-made waterway in Egypt, connecting the Mediterranean Sea to the Red Sea. It is 193.30 kilometers long and plays a crucial role in trade between Europe and Asia.

White Sea–Baltic Canal: The White Sea–Baltic Canal, also known as the White Sea Canal, is a ship canal in Russia. It was opened on August 2, 1933, and connects the White Sea with Lake Onega, which eventually leads to the Baltic Sea. Originally named the Stalin White Sea–Baltic Canal, it played a significant role in the country's transportation system until 1961.

Northeast Passage: The Northeast Passage is an Arctic shipping route connecting the Atlantic and Pacific Oceans along Norway and Russia's Arctic coasts. The Northwest Passage refers to the western route through Canada's islands.

Northwest Passage: The Northwest Passage is a sea route through the Arctic Ocean, connecting the Atlantic and Pacific oceans along the northern coast of North America. It passes through the Canadian Arctic Archipelago and is known as the Northeast Passage along the Arctic coasts of Norway and Siberia. The route is formed by a series of waterways, called the Northwest Passages or Canadian Internal Waters, which separate islands from each other and from mainland Canada.

Great Artesian Basin: The Great Artesian Basin (GAB) is the world's largest and deepest artesian basin, situated in Australia. Covering over 1,700,000 square kilometres (660,000 sq mi), it contains water temperatures ranging from 30 to 100 °C. The GAB is essential as it serves as the sole source of fresh water across much of inland Australia.

Antarctic ice sheet: The Antarctic ice sheet is the largest mass of ice on Earth, covering about 98% of the Antarctic continent. It has an average thickness of over 2 kilometers and spans an area of almost 14 million square kilometers. It contains 26.5 million cubic kilometers of ice. It should not be confused with the Antarctic sea ice. The other ice sheet on Earth is the Greenland ice sheet.

Greenland ice sheet: The Greenland ice sheet is a massive body of ice that covers around 80% of Greenland's surface. It is about 1.67 km thick on average and up to 3.5 km at its thickest point. Spanning over 1,700,000 square kilometers, it is the second largest ice sheet in the world after the East Antarctic. It is often called an ice cap or inland ice and referred to as GIS or GrIS in scientific literature.

Great Barrier Reef: The Great Barrier Reef is the world's largest coral reef system spanning over 2,300 km. It consists of over 2,900 individual reefs and 900 islands, covering an area of about 344,400 square kilometres. Located off the coast of Queensland, Australia, it can be seen from space and is the largest structure created by living organisms. The reef is made up of coral polyps and supports abundant biodiversity. It was designated as a World Heritage Site in 1981 and is recognized as one of the Seven Natural Wonders of the World. Its importance is also acknowledged by being listed as a state icon of Queensland.

Mid-Atlantic Ridge: The Mid-Atlantic Ridge is a vast underwater mountain range in the Atlantic Ocean. It separates the North American and Eurasian Plates in the north and the African and South American Plates in the south. Stretching from Greenland to the South Atlantic, it is the longest mountain range in the world. Though mainly submerged, parts of the ridge emerge above sea level, notably in Iceland. The ridge is characterized by a spreading rate of about 2.5 centimeters per year.

Mariana Trench: The Mariana Trench is the deepest oceanic trench on Earth, located in the western Pacific Ocean, east of the Mariana Islands. It is crescent-shaped, measuring about 2,550 km in length and 69 km in width, with a maximum known depth of 10,984 metres at the Challenger Deep. It is deeper than Mount Everest is tall.

Angel Falls: Angel Falls is the world's tallest waterfall, located in Venezuela. It has a height of 979 meters (3,212 ft) and drops over the Auyán-tepui mountain in Canaima National Park. The waterfall includes a main plunge, sloped cascade, rapids, and a downstream plunge.

Iguazu Falls: Iguazu Falls is the largest waterfall system in the world, located on the border of the Argentine province of Misiones and the Brazilian state of Paraná. The falls divide the Iguazu River into upper and lower sections, with most of the falls on the Argentine side. The river flows through Brazil for most of its course and forms the border between Argentina and Brazil after merging with the San Antonio River.

Niagara Falls: Niagara Falls is a group of three waterfalls on the border of Ontario, Canada and New York, USA. The largest is Horseshoe Falls, known as Canadian Falls, located between the two countries. The American Falls and Bridal Veil Falls are within the US. Bridal Veil Falls is separated from Horseshoe Falls by Goat Island and from American Falls by Luna Island.

Victoria Falls: Victoria Falls is a massive waterfall on the Zambezi River in southern Africa, serving as a home to diverse plant and animal life. It spans the border of Zambia and Zimbabwe and is among the largest waterfalls globally, boasting a width of 1,708 m (5,604 ft).

Everglades: The Everglades is a flooded grassland region in southern Florida, USA. It is part of a large drainage basin, starting with the Kissimmee River near Orlando, flowing into Lake Okeechobee, and then forming a slow-moving river that stretches over 100 miles to Florida Bay. The Everglades experiences varying weather patterns, from frequent flooding to drought. However, it has suffered significant habitat loss and environmental degradation.

Canary Islands: The Canary Islands, also called Canaries, are an archipelago and Spanish autonomous community in the Atlantic Ocean. They are located 100 km west of Morocco and the Western Sahara, making them the southernmost part of Spain. With a population of 2.2 million people, the Canary Islands are the most populous special territory of the European Union.

Mayotte: Mayotte is an overseas department and region of France located in the Indian Ocean. It consists of a main island, Grande-Terre, a smaller island, Petite-Terre, and several islets. With its prosperous economy, Mayotte attracts a significant number of immigrants, positioning itself as a major destination in the Mozambique Channel.

Madeira: Madeira is an archipelago in the North Atlantic Ocean, known as an autonomous region of Portugal. It is culturally associated with Europe and geologically located on the African Tectonic Plate. With Funchal as its capital, its population is predominantly descended from original Portuguese settlers and was recorded to be 251,060 in 2021.

Réunion: Réunion is an island in the Indian Ocean, located east of Madagascar and southwest of Mauritius. It is an overseas department and region of France, known for its population of 885,700 and its capital city, Saint-Denis.

Zanzibar: Zanzibar is an archipelago in the Indian Ocean, joined with Tanganyika in 1964 to create Tanzania. It is a semi-autonomous region consisting of small and large islands, with Zanzibar City as the capital. Stone Town, a World Heritage Site, is its historic center.

Alexander Island: Alexander Island, also known as Alexander I Island, is the largest island in Antarctica. Located in the Bellingshausen Sea, it is separated from the Antarctic Peninsula by Marguerite Bay and George VI Sound. The George VI Ice Shelf connects it to Palmer Land. The island surrounds Wilkins Sound and measures 390km long, 80km wide in the north, and 240km wide in the south. It is the second-largest uninhabited island globally, after Devon Island.

Andaman and Nicobar Islands: The Andaman and Nicobar Islands is a union territory of India, consisting of 571 islands with 37 inhabited. Located at the junction of the Bay of Bengal and the Andaman Sea, it is about 150 km north of Aceh in Indonesia. The islands are separated from Thailand and Myanmar by the Andaman Sea and are divided into two groups - Andaman Islands and Nicobar Islands. The territory is surrounded by the Andaman Sea on the east and the Bay of Bengal on the west. These islands are believed to be a submerged extension of the Arakan Mountains.

British Indian Ocean Territory: The British Indian Ocean Territory (BIOT) is a UK Overseas Territory located in the Indian Ocean between Tanzania and Indonesia. It consists of seven atolls in the Chagos Archipelago, with over 1,000 small islands covering a total land area of 60 square kilometers. The largest island, Diego Garcia, is 27 square kilometers and houses a Joint Military Facility operated by both the UK and the US. Despite being administered remotely from London, the capital is considered to be on Diego Garcia.

Jeju Island: Jeju Island is South Korea's biggest island, accounting for 1.83% of the country's total area. It is situated in Jeju Province and covers 1,833.2 km2.

Kuril Islands: The Kuril Islands are a group of volcanic islands administered by Russia, stretching about 1,300 km northeast from Japan to Russia. They separate the Sea of Okhotsk from the north Pacific Ocean. There are 56 islands and many smaller islets, covering an area of 10,503.2 square kilometres. The islands consist of the Greater and Lesser Kuril Chains and are home to roughly 20,000 people.

Phuket province: Phuket province is located in southern Thailand and consists of the largest island in the country, along with 32 smaller islands. It is situated in the Andaman Sea, off the west coast of mainland Thailand. Phuket Island is connected to Phang Nga province by the Sarasin Bridge and is bordered by Krabi to the east across Phang Nga Bay.

Socotra: Socotra, also known as Saqatri, is the largest island in the Socotra archipelago, located in the Indian Ocean and belonging to the Republic of Yemen. Positioned between the Guardafui Channel and the Arabian Sea and situated near important shipping routes, Socotra is recognized as the main island in the Socotra Governorate since 2013.

Hainan: Hainan is the southernmost province of China, comprising several islands in the South China Sea. Its name signifies its location south of the Qiongzhou Strait, separating it from the Chinese mainland.

Hokkaido: Hokkaido is Japan's second largest island, constituting its own region and being the northernmost prefecture. It is separated from Honshu by the Tsugaru Strait and connected to it via the Seikan Tunnel, an undersea railway.

Honshu: Honshu, the largest and most populated island in Japan, was historically known as Akitsushima. Situated south of Hokkaidō and separated by the Tsugaru Strait, and north of Shikoku across the Inland Sea, Honshu also lies northeast of Kyūshū across the Kanmon Straits. This island serves as a divide between the Sea of Japan and the North Pacific Ocean. Honshu ranks as the seventh-largest island globally and holds the second-highest population after Java in Indonesia.

Kyushu: Kyushu is Japan's third-largest and most southerly island. It has been known by various names in the past, such as Kyūkoku, Chinzei, and Tsukushi-no-shima. The region was historically referred to as Saikaidō. Kyushu spans an area of 36,782 square kilometers and had a population of 14,311,224 in 2018.

Ryukyu Islands: The Ryukyu Islands, also called the Nansei Islands or the Ryukyu Arc, are a chain of Japanese islands extending southwest from Kyushu to Taiwan. It includes the Ōsumi, Tokara, Amami, Okinawa, and Sakishima Islands, with Yonaguni being the most western. These islands consist of larger volcanic landmasses and smaller coral islands, with Okinawa Island being the largest.

Shikoku: Shikoku, the smallest of Japan's four main islands, is located south of Honshu and northeast of Kyushu. It stretches 225 km (139.8 mi) long and is between 50 and 150 km (31.1 and 93.2 mi) wide. With a population of 3.8 million, it is the least populated main island. Shikoku's name references its four former provinces: Awa, Tosa, Sanuki, and Iyo.

Malay Archipelago: The Malay Archipelago, also known as Insulindia or the Indo-Australian Archipelago, refers to the collection of islands between Mainland Southeast Asia and Australia. It has been given several names over time, including "Malay world," "Nusantara," and "East Indies." The term originated from the 19th-century European understanding of a Malay race, which was based on the presence of Austronesian languages in the region.

Maluku Islands: The Maluku Islands, also known as the Moluccas, are an archipelago located in eastern Indonesia. They are situated on the Halmahera Plate within the Molucca Sea Collision Zone. Geographically, they are positioned east of Sulawesi, west of New Guinea, and north and east of Timor. The Moluccas are considered to be a significant meeting point between Asia and Oceania, both geographically and culturally.

Borneo: Borneo is the world's third-largest island, spanning 748,168 sq km. Located in Maritime Southeast Asia, it is part of the Greater Sunda Islands, bordered by Java, Sulawesi, and Sumatra.

Java: Java is a highly populated island in Indonesia, home to over half of the country's population. It is surrounded by the Indian Ocean and the Java Sea. Indonesia's capital city, Jakarta, is located on the island's northwest coast.

Sumatra: Sumatra, an island in western Indonesia, is the largest fully Indonesian territory and the sixth-largest island globally. Covering 475,807.63 km2 (182,812 mi.2), it includes neighboring islands like Simeulue, Nias, and Krakatoa archipelago.

Sulawesi: Sulawesi, also called Celebes, is one of Indonesia's four Greater Sunda Islands. It is the 11th-largest island globally, situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Archipelago. Sumatra, Borneo, and Papua are the only Indonesian islands larger in size, while Java and Sumatra have higher populations.

Lesser Sunda Islands: The Lesser Sunda Islands, also known as Nusa Tenggara Islands, are an archipelago in Maritime Southeast Asia. They are mostly located in the Wallacea region, except for Bali which is in the Sunda Shelf. Together with the Greater Sunda Islands, they form the Sunda Islands. The islands are part of the Sunda Arc, a volcanic arc formed by subduction along the Sunda Trench. Over 20 million people inhabit the islands. "Nusa Tenggara" translates to "Southeast Islands" in the Old Javanese language.

Bali: Bali, a province of Indonesia, is the westernmost of the Lesser Sunda Islands. It includes the main island of Bali and smaller offshore islands like Nusa Penida. The capital, Denpasar, is the largest city in the Lesser Sunda Islands. Ubud, a town in Greater Denpasar, is the cultural center of Bali. The province is a major tourist destination, with tourism making up most of its economy.

Timor: Timor is an island located in Maritime Southeast Asia, at the southern tip of the Timor Sea. It is divided between East Timor and Indonesia, with West Timor belonging to Indonesia's East Nusa Tenggara province. Within West Timor, there is a small exclave of East Timor called Oecusse District. The island has a total area of 30,777 square kilometers and is named after its eastern location among the Lesser Sunda Islands. It is geographically close to mainland Australia, with the Timor Sea separating the two by less than 500 km.

Luzon: Luzon: Largest and most populous Philippine island in the northern region. Economic and political hub of the nation, housing Manila and Quezon City. Population of 64 million, constituting 52.5% of the Philippines' total population. 4th most populous island globally, ranked 15th largest by land area.

Mindanao: Mindanao is the second-largest island in the Philippines and the seventh-most populous island globally. It is located in the southern region of the archipelago and is part of a larger island group. The island has a population of 26,252,442 people, while the entire group has an estimated population of 27,021,036 according to recent censuses.

Visayas: The Visayas, also known as the Visayan Islands, are a major division of the Philippines in the central part of the archipelago. Comprising several islands surrounding the Visayan Sea, it is considered the northeast part of the Sulu Sea. The Visayas is inhabited mainly by the Visayan peoples.

Sakhalin: Sakhalin is an elongated island off the southeastern coast of Khabarovsk Krai in Russia, located north of Japan's Hokkaido. It's the largest island in Russia, dividing the Sea of Okhotsk from the Sea of Japan. With an area of 72,492 square kilometers, it is administered as part of Sakhalin Oblast. The island has a population of roughly 500,000, primarily consisting of Russians. The indigenous peoples, including the Ainu, Oroks, and Nivkhs, are now present in very small numbers.

Azores: The Azores is an archipelago of nine volcanic islands in the North Atlantic Ocean, located 1,400 km west of Lisbon, Portugal. It is an autonomous region of Portugal and part of the Macaronesia region.

Balearic Islands: The Balearic Islands are a Spanish province and autonomous community located in the western Mediterranean Sea near the eastern coast of the Iberian Peninsula. Palma de Mallorca serves as the capital and largest city of this archipelago.

Corsica: Corsica is the fourth-largest island in the Mediterranean Sea and one of the 18 regions of France. It lies southeast of the French mainland, west of the Italian Peninsula, and north of the island of Sardinia. Approximately two-thirds of the island is covered by a single chain of mountains. Its population as of January 2023 was 351,255.

Faroe Islands: The Faroe Islands, also known as the Faroes, are an archipelago in the North Atlantic Ocean. They are a self-governing territory of Denmark, with the Faroese language being the official language. Faroese shares similarities with Icelandic.

Novaya Zemlya: Novaya Zemlya is an Arctic archipelago in northern Russia. Located in the extreme northeast of Europe, it is surrounded by the Barents Sea to the west and the Kara Sea to the east. The archipelago's northern island, with Cape Flissingsky, marks the easternmost point of Europe.

Sardinia: Sardinia is Italy's second-largest island, located in the Mediterranean Sea. It is positioned west of the Italian Peninsula, north of Tunisia, and south of Corsica.

Sicily: Sicily is Italy's largest and most populous island in the Mediterranean Sea, known for its rich history and cultural heritage. It is an autonomous region with a population of 4.8 million and its capital is Palermo. The island is named after the ancient Sicels, who lived there during the Iron Age.

Svalbard: Svalbard, or Spitsbergen, is a Norwegian archipelago in the Arctic Ocean, situated between northern Norway and the North Pole. It encompasses islands ranging from 74° to 81° north latitude and 10° to 35° east longitude. The main island is Spitsbergen, with Nordaustlandet and Edgeøya following in size. The largest settlement is Longyearbyen on the west coast of Spitsbergen.

Zealand: Zealand is the largest and most populous island in Denmark. It spans over an area of 7,031 km2 and had a population of 2,319,705 as of January 2020.

British Isles: The British Isles are a group of islands off the north-western coast of Europe. They include Great Britain, Ireland, Isle of Man, Inner and Outer Hebrides, Northern Isles, and over 6,000 smaller islands. The total area is 315,159 km2 with a population of almost 72 million. The sovereign states within the British Isles are the Republic of Ireland and the United Kingdom. The Channel Islands, although not part of the archipelago, are considered part of the British Isles.

Great Britain: Great Britain, located in the North Atlantic, is the largest European island and ninth-largest in the world. It comprises England, Scotland, and Wales, and has a maritime climate with mild seasonal variations. Together with the island of Ireland and over 1,000 smaller surrounding islands, it forms the British Isles archipelago.

Channel Islands: The Channel Islands are an archipelago off the French coast of Normandy divided into two Crown Dependencies: Jersey and Guernsey. They were once part of the Duchy of Normandy and are now under the defense and international relations responsibility of the UK. The islands are not part of the UK, Commonwealth, or EU. With a total population of about 171,916, the capitals of the islands are Saint Helier and Saint Peter Port.

Isle of Man: The Isle of Man, also known as Mann, is a self-governing British Crown Dependency located in the Irish Sea between Great Britain and Ireland. Charles III is the Lord of Mann and is represented by a Lieutenant Governor. The United Kingdom is responsible for the island's military defense and represents it internationally.

Ireland: Ireland is a North Atlantic island in north-western Europe, separated from Great Britain by the North Channel, the Irish Sea, and St George's Channel. It is the second-largest island of the British Isles, the third-largest in Europe, and the twentieth-largest globally.

Crete: Crete, the largest Greek island, is also the fifth largest island in the Mediterranean Sea. Its location is about 160 km south of mainland Greece, and it has an area of 8,450 km2 and a coastline of 1,046 km. With the Aegean, the Sea of Crete, and the Libyan Sea as its borders, Crete spans three longitudes but only half a latitude.

Greenland: Greenland is the largest country in the Kingdom of Denmark and one of its three constituent countries, along with Denmark proper and the Faroe Islands. Its citizens are also citizens of Denmark and the European Union. The capital city is Nuuk. Located between the Arctic and Atlantic oceans, Greenland is the world's largest island and the northernmost region on Earth. It is home to the world's northernmost undisputed point of land, Kaffeklubben Island.

Bermuda: Bermuda, separate from the Bahamas, is a British Overseas Territory located in the North Atlantic Ocean. It is famous for its pink sandy beaches, crystal-clear turquoise waters, and a subtropical climate. The island is known for its cultural diversity, with a mix of British, American, African, and Portuguese influences. Bermuda is renowned as a global offshore financial center and is home to many international businesses.

Greater Antilles: The Greater Antilles refers to a cluster of major islands in the Caribbean Sea, namely Cuba, Hispaniola (shared by Haiti and the Dominican Republic), Puerto Rico, Jamaica, Navassa Island, and the Cayman Islands. This region is home to six island states. Along with the Lesser Antilles, the Greater Antilles forms the Antilles.

Cayman Islands: The Cayman Islands is a British Territory in the Caribbean, consisting of the islands of Grand Cayman, Cayman Brac, and Little Cayman. It is the largest territory by population and spans 264 square kilometers. The capital city is George Town on Grand Cayman, which is also the most populous island.

Hispaniola: Hispaniola is a populous island in the Caribbean, belonging to the Greater Antilles and ranking as the second largest in the region after Cuba.

Lesser Antilles: The Lesser Antilles are a group of islands in the Caribbean Sea, located east of Puerto Rico. They form an arc that stretches south through the Leeward and Windward Islands, and then turns west along the Venezuelan coast. Barbados is an isolated island located about 100 miles east of the Windwards. This island group is distinct from the larger Greater Antilles to the west.

ABC islands (Leeward Antilles): The ABC islands are Aruba, Bonaire, and Curaçao, located in the Leeward Antilles in the Caribbean Sea. These islands have a shared political history and are under Dutch ownership. They are near Venezuela and have a status of autonomy or special municipality within the Kingdom of the Netherlands. The islands are not part of the European Union, but still provide benefits to the former colonial power through trade and resource rights.

Guadeloupe: Guadeloupe is a Caribbean archipelago, an overseas department and region of France. It consists of six inhabited islands, including Basse-Terre, Grande-Terre, and Marie-Galante. The capital is Basse-Terre, but the most populous city is Les Abymes. The region has a population of 378,561 people.

Martinique: Martinique is an island in the eastern Caribbean Sea, belonging to the French West Indies. It is an overseas department and region of the French Republic, and part of the European Union. The currency used is the euro.

Arctic Archipelago: The Arctic Archipelago, also called the Canadian Arctic Archipelago, is a group of islands located north of mainland Canada. It does not include Greenland and Iceland.

Baffin Island: Baffin Island, located in Nunavut, Canada, is the country's largest and the world’s fifth-largest island. It spans an area of 507,451 km2 (195,928 sq mi) with a low population density of 0.03/km². The island houses around 13,039 people as per the 2021 Canadian census and includes the capital city of Nunavut, Iqaluit.

Ellesmere Island: Ellesmere Island is Canada's northernmost and third largest island. It covers an area of 196,236 km2 and spans 830 km in length. It ranks as the tenth largest island globally, slightly smaller than Great Britain.

Newfoundland (island): Newfoundland is a sizable island off the eastern coast of North America, and part of the Canadian province of Newfoundland and Labrador.

Aleutian Islands: The Aleutian Islands are a chain of 14 large volcanic islands and 55 smaller islands in the Northern Pacific Ocean. They stretch about 1,200 mi westward from the Alaska Peninsula towards Russia's Kamchatka Peninsula. Most of the islands belong to Alaska, but some are part of Kamchatka Krai. They act as a border between the Bering Sea and the Pacific Ocean. With a land area of 6,821 sq mi, they are known for their remote location and wild beauty.

New Britain: New Britain is the biggest island in the Bismarck Archipelago, part of Papua New Guinea. It is separated from New Guinea and New Ireland by bodies of water. The main towns on the island are Rabaul/Kokopo and Kimbe. It has active volcanoes and experienced a major eruption in 1994. The eruption caused significant damage to Rabaul, leading to the capital being relocated to Kokopo.

French Polynesia: French Polynesia is a collection of islands and atolls in the South Pacific Ocean, owned by France. It consists of 121 islands spread over 2,000 kilometers. The total land area is 3,521 square kilometers with a population of 278,786. The majority of the population lives in the Society Islands.

New Caledonia: New Caledonia is an overseas collectivity of France in the southwest Pacific Ocean. It is located south of Vanuatu, east of Australia, and far from Metropolitan France. The archipelago includes several islands, such as Grande Terre, the Loyalty Islands, and the Isle of Pines. The Chesterfield Islands are situated in the Coral Sea. Locally, Grande Terre is known as "Le Caillou." Although New Caledonia is an overseas territory of the European Union, it is not part of the EU.

New Guinea: New Guinea, the world's second-largest island, is located in Melanesia in the Pacific Ocean. It is separated from Australia by the Torres Strait and was once united with it during low sea levels. The island is surrounded by smaller islands and named after its resemblance to Guinea in Africa.

North Island: The North Island, also known as Te Ika-a-Māui, is the larger of the two main islands in New Zealand. It is separated from the South Island by Cook Strait and covers an area of 113,729 km2 (43,911 sq mi). With a population of 3,997,300, it is home to 77% of New Zealand's residents, making it the most populous island in Polynesia. It ranks as the world's 14th-largest island and constitutes 44% of New Zealand's land area.

South Island: The South Island, also called Te Waipounamu, is the larger of New Zealand's two major islands. It is bordered by Cook Strait, the Tasman Sea, and the Pacific Ocean. With an area of 150,437 square kilometers, it is the world's 12th-largest island and represents 56% of New Zealand's land. The South Island has an oceanic climate at lower altitudes.

Easter Island: Easter Island is a Chilean territory in the Pacific Ocean, known for its 1,000 ancient statues called moai, created by the Rapa Nui people. It was designated a World Heritage Site by UNESCO in 1995 and is mostly protected within Rapa Nui National Park.

Falkland Islands: The Falkland Islands archipelago is located in the South Atlantic Ocean, around 480 km east of South America's Patagonian coast. It comprises of East Falkland, West Falkland, and 776 smaller islands, covering an area of 12,000 km2. As a British overseas territory, the Falklands have internal self-governance, but the UK is responsible for defense and foreign affairs. The capital and largest settlement is Stanley on East Falkland.

Galápagos Islands: The Galápagos Islands are a volcanic archipelago located in the Eastern Pacific, 900 km west of South America. They are part of Ecuador's Galápagos Province and consist of three main islands with a population of over 33,000. These islands are known for their unique endemic species, which influenced Charles Darwin's theory of evolution. The entire archipelago is protected as Ecuador's Galápagos National Park and Marine Reserve.

Marajó: Marajó is the largest coastal island in Pará, Brazil. It belongs to the Marajó Archipelago and is surrounded by Marajó Bay, Pará River, smaller rivers, Companhia River, Jacaré Grande River, Vieira Grande Bay, and the Atlantic Ocean.

Tierra del Fuego: Tierra del Fuego: Archipelago off the southernmost tip of South America, beyond the Strait of Magellan.

Cape of Good Hope: The Cape of Good Hope is a rocky headland on the Atlantic coast of the Cape Peninsula in South Africa.

Horn of Africa: The Horn of Africa (HoA), or Somali Peninsula, is a large geopolitical region in East Africa. It is the fourth largest peninsula in the world, located at the easternmost part of the African mainland. With countries such as Ethiopia, Eritrea, Somalia, and Djibouti, it stretches along the southern boundary of the Red Sea and extends into the Guardafui Channel, Gulf of Aden, and Indian Ocean. The region also shares a maritime border with the Arabian Peninsula. The broader term, Greater Horn Region (GHR), includes additional countries like Kenya, Sudan, South Sudan, Uganda, Burundi, Rwanda, and Tanzania.

Baja California peninsula: The Baja California peninsula in northwestern Mexico separates the Gulf of California from the Pacific Ocean. It extends from Mexicali, Baja California, in the north to Cabo San Lucas, Baja California Sur, in the south.

Cape Horn: Cape Horn is the southernmost point of the Tierra del Fuego archipelago in southern Chile. It is situated on Hornos Island and serves as the boundary between the Drake Passage and the meeting point of the Atlantic and Pacific Oceans.

Yucatán Peninsula: The Yucatán Peninsula is a large peninsula in southeastern Mexico, Belize, and Guatemala. It separates the Gulf of Mexico from the Caribbean Sea and is connected to Cuba by the Yucatán Channel.

Antarctic Peninsula: The Antarctic Peninsula, also called O'Higgins Land in Chile and Tierra de San Martín in Argentina, is the northernmost region of mainland Antarctica. It was originally known as Graham Land in the United Kingdom and the Palmer Peninsula in the United States.

Anatolia: Anatolia, also called Asia Minor, is a peninsula in West Asia and the farthest western part of continental Asia. It forms most of present-day Turkey and is bordered by European Turkey. Geographically, it is surrounded by the Turkish Straits, Black Sea, Armenian Highlands, Mediterranean Sea, and Aegean Sea. The Sea of Marmara connects it to the Black Sea and Aegean Sea while separating it from Thrace in Southeastern Europe.

Arabian Peninsula: The Arabian Peninsula, also called Arabia, is the world's largest peninsula, located in West Asia and northeast of Africa. Covering an area of 3,237,500 km2 (1,250,000 sq mi), it sits on the Arabian Plate.

Korea: Korea is a divided peninsula in East Asia, split near the 38th parallel into two states: South Korea in the south and North Korea in the north. The region includes the Korean Peninsula, Jeju Island, and surrounding minor islands. It borders China and Russia to the north and is separated from Japan by the Korea Strait to the southeast.

Mainland Southeast Asia: Mainland Southeast Asia refers to the continental region in Southeast Asia, bordered by the Indian Ocean and the Pacific Ocean. It includes Cambodia, Laos, Myanmar, Thailand, Vietnam, and Peninsular Malaysia.

Malay Peninsula: The Malay Peninsula is a landmass in Mainland Southeast Asia, marked by its southernmost location on the Asian continental mainland. It encompasses Peninsular Malaysia, Southern Thailand, and the southernmost tip of Myanmar. Singapore also has strong historical and cultural connections to the region. The peninsula is home to the indigenous people Orang Asli and Malays, who are of Austronesian origin.

Kamchatka Peninsula: The Kamchatka Peninsula is a large peninsula in the Russian Far East, stretching 1,250 kilometers (777 miles) with an area of about 270,000 square kilometers (100,000 square miles). It is bordered by the Pacific Ocean to the east and the Sea of Okhotsk to the west. Off the Pacific coast lies the Kuril-Kamchatka Trench, a deep trench reaching a depth of 10,500 meters (34,449 feet).

Sinai Peninsula: The Sinai Peninsula is a land bridge between Asia and Africa, located in Egypt. It is bordered by the Mediterranean Sea to the north and the Red Sea to the south. With a land area of 60,000 km2 and a population of 600,000, it is the only part of Egypt in Asia. The peninsula is divided into two governorates: South Sinai and North Sinai. Additionally, three other governorates span the Suez Canal: Suez, Ismailia, and Port Said.

Balkans: The Balkans, a region in southeastern Europe, is named after the Balkan Mountains in Bulgaria. It is bordered by the Adriatic Sea, Ionian Sea, Aegean Sea, Turkish straits, and the Black Sea. The highest point is Musala in Bulgaria's Rila mountain range.

Crimea: Crimea is a peninsula in Eastern Europe, almost entirely surrounded by the Black Sea and Sea of Azov. It is connected to mainland Ukraine by the Isthmus of Perekop and to Russia by the Crimean Bridge. The Arabat Spit separates it from the Sea of Azov. Romania and Turkey lie to the west and south respectively. Sevastopol is its largest city. With a population of 2.4 million, Crimea has been under Russian occupation since 2014.

Kola Peninsula: The Kola Peninsula is a large peninsula in Russia's extreme northwest, situated within the Arctic Circle. It is predominantly part of Murmansk Oblast and is surrounded by the Barents Sea to the north and the White Sea to the east and southeast. The peninsula's most populous city, Murmansk, is home to approximately 270,000 people.

Iberian Peninsula: The Iberian Peninsula, or Iberia, is a peninsula in Southwestern Europe, dividing Peninsular Spain and Continental Portugal. It includes Andorra, Gibraltar, and a part of Southern France. With an area of about 583,254 square kilometers and a population of around 53 million, it is the second-largest European peninsula after Scandinavia.

Eurasian Steppe: The Eurasian Steppe, also known as the Great Steppe or The Steppes, is a vast ecoregion in Eurasia characterized by temperate grasslands, savannas, and shrublands. It stretches across multiple countries including Hungary, Bulgaria, Romania, Moldova, Ukraine, southern Russia, Kazakhstan, Xinjiang, Mongolia, and Manchuria. One notable feature is the Pannonian steppe, which is mostly located in Hungary.

Ring of Fire: The Ring of Fire is a wide belt surrounding the Pacific Ocean, known for its high concentration of volcanoes and earthquakes. It spans about 40,000 km in length and up to 500 km in width. The exact number of volcanoes within this belt is disputed, but it is said to contain between 750 and 915 active or dormant volcanoes, comprising around two-thirds of the world's total. Additionally, approximately 90% of the world's earthquakes, including the largest ones, occur within this region.

Aïr Mountains: The Aïr Mountains is a triangular massif in northern Niger within the Sahara. It is part of the West Saharan montane xeric woodlands and covers 84,000 sq mi. The Aïr plateau, with an altitude between 500 and 900 m, supports various life forms and communities. The region has remarkable geological and archaeological sites, including prehistoric excavations. The African wild dog, once found here, is now endangered due to human population pressures.

Atlas Mountains: The Atlas Mountains is a mountain range in North Africa that stretches 2,500 km through Morocco, Algeria, and Tunisia. It separates the Sahara Desert from the Mediterranean Sea and the Atlantic Ocean, giving the Atlantic its name. The highest peak, Toubkal, is in central Morocco, reaching an elevation of 4,167 meters. The region is primarily inhabited by Berber populations.

Drakensberg: The Drakensberg is the eastern part of the Great Escarpment in Southern Africa, known for its high elevation of 2,000 to 3,482 metres. It encloses the central Southern African plateau and stretches across South Africa and Lesotho.

Ethiopian Highlands: The Ethiopian Highlands in Northeast Africa is a vast mountainous region known as the "Roof of Northeastern Africa." It is the largest continuous high-elevation area on the continent, with peaks reaching up to 4,550 m (14,930 ft). This rugged landscape is bisected by the Great East African Rift System and spans across Ethiopia and Eritrea. The Ethiopian Highlands are unique in the region, as they are the only area with such high elevation.

Great Rift Valley: The Great Rift Valley is a long trench system spanning over 7,000 kilometers from Lebanon to Mozambique. Though its name is still used, it is not favored in geology due to combining distinct rift and fault systems.

Sahel: The Sahel is a biogeographic region in Africa, serving as a transition zone between Sudanian savannas and the Sahara. It has a hot steppe climate and stretches across North Africa, from the Atlantic Ocean to the Red Sea. Despite being in the tropics, it does not have a tropical climate.

Tassili n'Ajjer: Tassili n'Ajjer is a UNESCO World Heritage Site in southeastern Algeria. This national park is known for its vast plateau in the Sahara desert, covering over 72,000 km2 (28,000 sq mi). It is home to one of the most significant collections of prehistoric cave art in the world.

Appalachian Mountains: The Appalachian Mountains, also known as the Appalachians, are a mountain range in North America. They encompass different regions and surrounding areas. The United States and Canada refer to these mountains as Appalachian Highlands and Appalachian Uplands, respectively.

Canadian Shield: The Canadian Shield, also known as the Laurentian Plateau, is a vast region in North America composed of exposed ancient rocks. Glacial activity has left a thin layer of soil, revealing igneous bedrock across the area. It covers over half of Canada, most of Greenland, and stretches from the Great Lakes to the Arctic Ocean, also extending into the northern part of the United States.

Grand Canyon: The Grand Canyon, located in Arizona, USA, is a massive canyon created by the Colorado River. It stretches for 277 miles (446 km), is up to 18 miles (29 km) wide, and reaches depths exceeding a mile.

Great Plains: The Great Plains, often called "the Plains," is a flat expanse of land in North America. Situated east of the Rocky Mountains, it is mostly covered in prairie, steppe, and grassland. The Great Plains are part of the larger Interior Plains, which include various other ecosystems. The term "Great Plains" also refers to the ecoregion of the same name, specifically the western section.

Pacific Coast Ranges: The Pacific Coast Ranges are a series of mountain ranges extending along the West Coast of North America from Alaska to Mexico. They are often considered as the westernmost mountain range of the United States and Canada, but the Insular Mountains of Vancouver Island are geologically distinct and lie farther west.

Sierra Nevada: The Sierra Nevada is a mountain range in the Western United States, primarily in California, but with a portion in Nevada. It is part of the American Cordillera, a chain of mountain ranges that extends through the Americas.

Rocky Mountains: The Rocky Mountains, or the Rockies, are the largest mountain system in North America, stretching 3,000 miles from Canada to New Mexico. The northern terminus is in Canada's British Columbia or Alaska's Brooks Range, while the southernmost point is near Albuquerque. As the easternmost part of the North American Cordillera, the Rockies are distinct from the Cascade Range and Sierra Nevada in the west.

Andes: The Andes, also known as the Andes Mountains or Andean Mountain Range, are the longest continental mountain range in the world, stretching 8,900 km (5,530 mi) along the western edge of South America. It has an average height of about 4,000 m (13,123 ft) and spans seven countries: Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile, and Argentina.

Altiplano: The Altiplano, also known as the Andean Plateau, is a vast high plateau in west-central South America. It is the largest plateau outside Tibet and stretches across Bolivia, with parts extending into Peru and Chile. Situated at the widest point of the Andes, it is characterized by its high elevation and expansive flatness.

Brazilian Highlands: The Brazilian Highlands, spanning 4.5 million km2, cover most of eastern, southern, and central Brazil. This region is home to the majority of Brazil's population and is bordered by a narrow coastal area.

Cerrado: The Cerrado is a vast tropical savanna in eastern Brazil, found in several states including Goiás, Mato Grosso, and Minas Gerais. It is known for its diverse habitats including forest savanna, park savanna, and gallery forests. The Cerrado is located in the Brazilian highlands and encompasses wetlands and woodland areas.

Gran Chaco: The Gran Chaco, also known as the Dry Chaco, is a sparsely populated and semiarid lowland region in South America. It spans across eastern Bolivia, western Paraguay, northern Argentina, and parts of Brazil. This land, also referred to as the Chaco Plain, is hot and connected with the Pantanal region.

Guiana Shield: The Guiana Shield is a 1.7 billion-year-old geological formation in northeast South America. It is part of the South American Plate and includes the Guiana Highlands, known for their table-like mountains called tepuis. The shield also boasts famous waterfalls like Angel Falls and Kaieteur Falls.

Pampas: The Pampas are extensive grasslands in South America covering over 1,200,000 square kilometers. They span across Argentina, Uruguay, and Brazil's Rio Grande do Sul state. The region is rich in fertility and interrupted by low hills.

Transantarctic Mountains: The Transantarctic Mountains are a range of uplifted rock in Antarctica, spanning from Cape Adare to Coats Land. They separate East Antarctica from West Antarctica and consist of various named mountain groups, which are further divided into smaller ranges.

Deccan Plateau: The Deccan Plateau in southern India lies between the Western Ghats and the Eastern Ghats, extending south of the Narmada River. It is bordered by the Satpura and Vindhya Ranges in the north.

Himalayas: The Himalayas, also known as Himalaya, is a mountain range in Asia that separates the Indian subcontinent from the Tibetan Plateau. Home to the world's highest peaks including Mount Everest, it boasts over 100 peaks above 7,200 m (23,600 ft) in elevation.

Indo-Gangetic Plain: The Indo-Gangetic Plain, also known as the North Indian River Plain, is a vast fertile plain covering northern regions of the Indian subcontinent, including parts of India, Pakistan, Bangladesh, and Nepal. It is named after the Indus and Ganges rivers and is bordered by the Himalayas to the north and the Deccan Plateau to the south. This region is home to major cities like Delhi, Dhaka, Kolkata, Lahore, Islamabad, and Karachi.

Karakoram: The Karakoram is a mountain range in the disputed Kashmir region, spanning Pakistan, China, India, Afghanistan, and Tajikistan. It is predominantly located in Gilgit-Baltistan, Pakistan. The range is home to K2, the highest peak. It starts in the Wakhan Corridor, extends through Gilgit-Baltistan, and reaches Ladakh and Aksai Chin.

Western Ghats: The Western Ghats, also known as Sahyadri, is a UNESCO World Heritage Site and a mountain range in India. Stretching over 1,600 km parallel to the western coast, it covers an area of 160,000 km2. Older than the Himalayas, it influences monsoon weather patterns and harbors rich biodiversity, with many endemic species. Separating the Deccan Plateau from the Arabian Sea coast, it is often called the Great Escarpment of India. It includes 39 designated world heritage sites, with Kerala having the highest number.

Caucasus Mountains: The Caucasus Mountains are a mountain range located between Asia and Europe, stretching from the Black Sea to the Caspian Sea. In this region, you can find Mount Elbrus, which is the highest peak in Europe standing at 5,642 metres (18,510 ft) above sea level.

Iranian Plateau: The Iranian Plateau is a geological feature in West, Central, and South Asia. It is situated between the Zagros Mountains, the Caspian Sea, the Armenian Highlands, the Persian Gulf, and the Indian subcontinent. It is part of the Eurasian Plate, wedged between the Arabian Plate and the Indian Plate.

Hindu Kush: The Hindu Kush is a 800-kilometre-long mountain range located in Central and South Asia. It stretches from Afghanistan into Pakistan and Tajikistan, forming the western part of the Hindu Kush Himalayan Region. Near its northeastern end, it borders the Pamir Mountains where China, Pakistan, and Afghanistan meet. The range runs southwest through Pakistan and into Afghanistan near their border.

Najd: Najd is the central region of Saudi Arabia, housing a significant portion of the country's population. It is the birthplace of the ruling House of Saud, which has been working towards uniting the region with Hejaz under Saudi governance since the Emirate of Diriyah.

Zagros Mountains: The Zagros Mountains are a 1,600 km long mountain range that extends across Iran, northern Iraq, and southeastern Turkey. Spanning from northwestern Iran to the Strait of Hormuz, it covers the western border of Iran and parts of Turkey and Iraq. Mount Dena, at 4,409 meters, is its highest point.

Kunlun Mountains: The Kunlun Mountains are a vast mountain range in Asia, stretching for over 3,000 kilometers. They form the northern boundary of the Tibetan Plateau and lie south of the Tarim Basin.

North China Plain: The North China Plain is a large alluvial plain in China formed by rift basin and modified by the Yellow River. It is the largest alluvial plain in China and is surrounded by Yanshan Mountains, Taihang Mountains, Dabie Mountains, Yellow Sea, and Bohai Sea. The Yellow River flows through the plain and drains into the Bohai Sea.

Tibetan Plateau: The Tibetan Plateau is a massive elevated plateau situated at the intersection of Central, South, and East Asia. It covers several regions including Tibet Autonomous Region, Qinghai, Sichuan, Xinjiang in China, Bhutan, Ladakh, Gilgit-Baltistan in Pakistan, Nepal, Tajikistan, and Kyrgyzstan. It stretches 1,000 km north to south and 2,500 km east to west. With an area of 2.5 million square kilometers, it is the highest and largest plateau above sea level. Surrounded by towering mountain ranges, including Mount Everest and K2, it is often referred to as "the Roof of the World."

Yunnan–Guizhou Plateau: The Yunnan–Guizhou Plateau or Yungui Plateau is a highland region in southwest China, spanning provinces of Yunnan and Guizhou. The plateau is characterized by both flat highland areas in the southwest and mountainous terrain with hills, gorges, and karst topography in the northeast.

Altai Mountains: The Altai Mountains, or Altay Mountains, are a range in Central and Eastern Asia, uniting Russia, China, Mongolia, and Kazakhstan. They serve as the origin of the Irtysh and Ob rivers. The massif combines with the Sayan Mountains to the northeast, and gradually decreases in height as it joins the Gobi Desert's high plateau. Spanning approximately 45° to 52° N and 84° to 99° E, the Altai Mountains are a significant geographical feature of the region.

Tian Shan: The Tian Shan is a vast system of mountain ranges in Central Asia, also known as Tengri Tagh or Tengir-Too, meaning "Mountains of God/Heaven". Its tallest peak, Jengish Chokusu, stands at 7,439 meters (24,406 ft) high. Additionally, the Tian Shan includes the Turpan Depression, reaching 154 meters (505 ft) below sea level.

West Siberian Plain: The West Siberian Plain is a vast plain in Siberia, spanning from the Ural Mountains to the Yenisei River and the Altai Mountains. It is characterized by its extensive swamps and floodplains. The region is home to major cities such as Chelyabinsk, Novosibirsk, Omsk, Tomsk, Surgut, and Nizhnevartovsk.

Alps: The Alps, a mountain range entirely in Europe, span 1,200 km across Monaco, France, Switzerland, Italy, Liechtenstein, Germany, Austria, and Slovenia. They are the highest and most extensive mountains in Europe.

Apennine Mountains: The Apennines are a mountain range in Italy, extending about 1,200 km (750 mi) from northwest to southwest. They join with the Ligurian Alps in the northwest and end at Reggio di Calabria in the southwest. The range also includes the mountains of north Sicily, making it a total distance of 1,500 kilometres (930 mi). The Apennines form an arc enclosing the eastern side of the Ligurian and Tyrrhenian Seas.

Balkan Mountains: The Balkan Mountains are a range in Southeastern Europe that start at Vrashka Chuka on the Bulgaria-Serbia border. They stretch for about 560 kilometers, forming a barrier across Bulgaria and reaching the Black Sea at Cape Emine. The highest peak is Botev Peak at 2,376 meters.

Carpathian Mountains: The Carpathian Mountains are a long range of mountains across Central Europe. They stretch for roughly 1,500 km (930 mi), making them the third-longest in Europe. The range spans several countries including Czech Republic, Slovakia, Poland, Ukraine, Romania, and Serbia. The Tatra mountains are the highest range within the Carpathians, reaching peaks over 2,600 m (8,500 ft). The Southern Carpathians in Romania also have impressive peaks, ranging from 2,500 m (8,200 ft) to 2,550 m (8,370 ft).

East European Plain: The East European Plain is an expansive interior plain that stretches eastward from the North European Plain. It includes several plateaus, such as the Volhynian-Podolian Upland and the Central Russian Upland, as well as major river basins like the Dnepr, Oka-Don, and Volga. On its southeastern edge, it borders the Caucasus and Crimean mountain ranges. Together with the North European Plain, it forms the majority of the Great European Plain, covering several countries including Russia, Ukraine, and Romania. The plain spans about 4,000,000 km2 and has an average elevation of 170 m. The highest point, found in the Valdai Hills, reaches 346.9 meters.

Pyrenees: The Pyrenees is a 500 km long mountain range located on the border of France and Spain. It extends from the Cantabrian Mountains to Cap de Creus on the Mediterranean coast, with a peak altitude of 3,404 meters at Aneto.

Scandinavian Mountains: The Scandinavian Mountains, also called the Scandes, is a range that stretches across the Scandinavian Peninsula. They drop dramatically into the North Sea and Norwegian Sea, forming Norway's stunning fjords. The mountains gradually curve towards Finland and serve as the border between Norway and Sweden. Reaching heights of 2,000 meters at the Arctic Circle, they barely touch northwesternmost Finland, appearing as hills near the North Cape.

Ural Mountains: The Ural Mountains, also known as the Urals, are a north-south mountain range in Eurasia, running through Russia and northwestern Kazakhstan. They form a boundary between Europe and Asia and extend into the Arctic Ocean through Vaygach Island and Novaya Zemlya. The average altitudes range from 1,000 to 1,300 meters (3,300-4,300 ft), with the highest peak being Mount Narodnaya at 1,894 meters (6,214 ft).

Great Dividing Range: The Great Dividing Range, also called the East Australian Cordillera or Eastern Highlands, is a vast mountain system in eastern Australia. It consists of multiple mountain ranges, plateaus, and rolling hills that run parallel to the country's east coast. This range is the fifth-longest land-based mountain chain globally, and the longest contained within a single country. It is a significant topographic feature in mainland Australia and acts as the main dividing line for river systems in the eastern part of the country.

Outback: The Outback is a remote and vast region of Australia, with a sparse population. It extends from the northern to southern coastlines, encompassing various climates such as arid, tropical, monsoonal, semi-arid, and temperate.

Southern Alps: The Southern Alps are a mountain range in New Zealand's South Island, with highest peaks on the western side. It extends along much of the island and is made up of several smaller ranges within it.

Uluru: Uluru, also called Ayers Rock, is a massive sandstone formation located in central Australia, specifically in the southern part of the Northern Territory—approximately 335 km (208 mi) southwest of Alice Springs.

Mount Kenya: Mount Kenya is an extinct stratovolcano in Kenya, the second-highest peak in Africa. Its highest peaks are Batian, Nelion, and Point Lenana. Located in former Eastern and Central provinces, it now intersects five counties and is 16.5 km south of the equator. Mount Kenya is the source of the name for the Republic of Kenya.

Mount Kilimanjaro: Mount Kilimanjaro is a dormant volcano in Tanzania's Kilimanjaro Region. Standing at 5,895 meters (19,341 feet) above sea level, it is Africa's highest mountain and the world's highest single free-standing mountain. The volcano has three cones: Kibo, Mawenzi, and Shira, and it holds the title of being the highest volcano in both Africa and the Eastern Hemisphere.

Vinson Massif: Vinson Massif is a large mountain massif in Antarctica located within the Ellsworth Mountains. It is 21 km long, 13 km wide, and overlooks the Ronne Ice Shelf near the Antarctic Peninsula. Discovered in 1958, it was named after Carl G. Vinson, a U.S. congressman known for supporting Antarctic exploration. Mount Vinson and Vinson Massif were declared as separate entities in 2006. It falls within the Chilean claim under the Antarctic Treaty System.

Krakatoa: Krakatoa, or Krakatau, is a volcanic caldera located in the Sunda Strait between Java and Sumatra in Indonesia. It consists of four islands, including Lang and Verlaten, which are remnants of a previous volcano, and Rakata, the remnant of a larger island destroyed in the infamous 1883 eruption.

Mount Pinatubo: Mount Pinatubo is an active stratovolcano situated in the Zambales Mountains on Luzon island in the Philippines. It is located on the border of Zambales, Tarlac, and Pampanga provinces in Central Luzon. Prior to the eruption in 1991, its eruptive history remained unknown to most. The volcano was hidden by dense forests, sustaining a population of thousands of indigenous Aetas.

Mount Tai: Mount Tai is a significant mountain in Shandong province, China. It holds historical and cultural importance and is situated north of Tai'an city. The highest point, Jade Emperor Peak, reaches 1,545 meters (5,069 ft) in height.

Mount Everest: Mount Everest is the tallest mountain on Earth, found in the Himalayas along the China-Nepal border. It reaches a height of 8,848.86 m and was last measured in 2020 by Chinese and Nepali authorities.

K2: K2 is the world's second-highest mountain, standing at 8,611 metres (28,251 ft) above sea level. It is located in the Karakoram range, spanning both Pakistan-administered Kashmir and China's Xinjiang region.

Mount Kailash: Mount Kailash is a sacred mountain in Tibet, China. Situated in the Kailash Range of the Transhimalaya and located less than 100 km north of the China-India-Nepal trijunction, it holds religious significance and is part of the Tibetan Plateau.

Mount Fuji: Mount Fuji is an active stratovolcano on the island of Honshū in Japan. It stands at 3,776.24 m tall, making it the highest mountain in Japan and the seventh-highest island peak worldwide. The volcano's last eruption occurred between 1707 and 1708. Located 100 km southwest of Tokyo, Mount Fuji is visible from the capital on clear days. With its symmetrical cone and snow-covered peak for five months each year, it is an iconic symbol of Japanese culture and a popular attraction for tourists, hikers, and climbers.

Mont Blanc: Mont Blanc is the highest mountain in the Alps and Western Europe, standing at 4,805.59m (15,766 ft) and located on the French-Italian border. It is Europe's second-most prominent mountain and the eleventh most prominent in the world.

Mount Elbrus: Mount Elbrus is the tallest mountain in Russia and Europe, located in the Caucasus. It reaches a height of 5,642 m (18,510 ft) above sea level and is a dormant stratovolcano. As the 10th most prominent peak globally, it stands in Southern Russia within the republic of Kabardino-Balkaria.

Mount Etna: Mount Etna, or simply Etna, is an active stratovolcano on the east coast of Sicily, Italy. It is one of Europe's tallest active volcanoes, reaching a height of 3,357 m (11,014 ft). Etna is located between the cities of Messina and Catania and sits above the convergent plate margin of the African Plate and the Eurasian Plate. In 2021, Etna experienced significant eruptions, causing its height to increase by around 100 ft (30 m). The southeastern crater is now the highest point of the volcano.

Mount Olympus: Mount Olympus, the tallest mountain in Greece, is located near the Thermaic Gulf of the Aegean Sea. It is part of the Olympus massif in the Olympus Range, between Thessaly and Macedonia. With 52 peaks and deep gorges, the highest peak, Mytikas, rises to 2,917.727 meters (9,572.60 feet), making it one of the highest peaks in Europe.

Mount Vesuvius: Mount Vesuvius is a stratovolcano situated in Campania, Italy, near Naples. It is part of the Campanian volcanic arc and features a large cone with a collapsed summit caldera.

Mount Pelée: Mount Pelée is an active volcano in Martinique, Lesser Antilles. Its cone is made of layers of ash and lava. The volcano last erupted in 1932.

Denali: Denali is the highest mountain peak in North America, reaching 20,310 feet above sea level. It is also the tallest mountain base-to-peak standing at 18,000 feet and the highest mountain north of 43°N. Located in Alaska's Denali National Park, it has a topographic prominence of 20,194 feet and is the third-most prominent and isolated peak on Earth, after Mount Everest and Aconcagua.

Mount St. Helens: Mount St. Helens is an active stratovolcano in Skamania County, Washington. It is located 52 miles northeast of Portland, Oregon, and 98 miles south of Seattle. The volcano's name, derived from a British diplomat, honors its connection to explorer George Vancouver. Mount St. Helens is part of the Cascade Volcanic Arc, within the Pacific Ring of Fire.

Mauna Loa: Mauna Loa, located in Hawaii, is the largest active volcano on Earth, both in terms of mass and volume. Although it was once thought to be the largest volcano until the discovery of Tamu Massif, it still holds its impressive stature. This shield volcano has gradual slopes and a volume estimated at 18,000 cubic miles. While slightly smaller than its neighbor Mauna Kea, Mauna Loa's eruptions are notable for their low silica content and high fluidity, making them non-explosive.

Mount Kosciuszko: Mount Kosciuszko, mainland Australia's tallest mountain at 2,228 metres (7,310 ft) above sea level, is situated in Kosciuszko National Park in New South Wales. It is part of the Australian Alps National Parks and Reserves, located west of Crackenback and near Jindabyne. Additionally, it is ranked 35th in terms of topographic isolation.

Puncak Jaya: Puncak Jaya, also known as Carstensz Pyramid, is the highest mountain peak on an island in the world, standing at an elevation of 4,884 m (16,024 ft). It is located in the Sudirman Range within the highlands of Mimika Regency, Central Papua, Indonesia. Puncak Jaya is ranked 5th in terms of topographic isolation.

Aconcagua: Aconcagua is the tallest mountain outside of Asia, located in the Andes in Argentina. It stands at 6,961 meters (22,838 ft) and is the highest peak in the Americas. It is also the highest in the Western Hemisphere and the Southern Hemisphere. Aconcagua is part of the Seven Summits, representing the highest peaks in each continent.

Arabian Desert: The Arabian Desert is a vast desert wilderness in West Asia occupying almost the entire Arabian Peninsula. It stretches from Yemen to the Persian Gulf and Oman to Jordan and Iraq. The desert is the fifth largest in the world, extending from the Sahara Desert. At its center lies Ar-Rub' al-Khali, one of the world's largest continuous bodies of sand.

Atacama Desert: The Atacama Desert is a desert plateau in northern Chile, stretching over a 1,600 km strip of land on the Pacific coast of South America. It covers an area of 105,000 km2, which increases to 128,000 km2 when including the barren lower slopes of the Andes Mountains.

Chihuahuan Desert: The Chihuahuan Desert is a desert region in northern Mexico and the southwestern United States. It covers parts of West Texas, New Mexico, Arizona, and the Mexican Plateau. It is bordered by the Sonoran Desert and the Sierra Madre Occidental range. The largest portion is in Mexico, covering Chihuahua and other states. Spanning an area of 501,896 km2, it is the largest desert in North America. The desert has been around for about 8000 years.

Gobi Desert: The Gobi Desert is a cold desert and grassland in northern China and southern Mongolia. It is the sixth largest desert globally, named after the Mongolian word for "waterless regions." The Chinese term Gobi specifically refers to rocky, semi-deserts like the Gobi itself rather than sandy deserts.

Great Victoria Desert: The Great Victoria Desert is a vast and sparsely populated desert in Western Australia and South Australia. It is an ecoregion characterized by its arid conditions and limited human presence.

Kalahari Desert: The Kalahari Desert is a vast semi-arid sandy savanna in Southern Africa, spanning 900,000 square kilometers. It covers portions of Botswana, Namibia, and South Africa.

Karakum Desert: The Karakum Desert is a vast desert in Central Asia covering around 70% of Turkmenistan. It is known for its shale-rich sand and spans approximately 350,000 km2 (140,000 sq mi).

Mojave Desert: The Mojave Desert is a desert in the Southwestern United States, situated in southeastern California, southwestern Nevada, with small portions in Arizona and Utah. It is named after the indigenous Mohave people and is located in the rain shadow of the southern Sierra Nevada mountains and Transverse Ranges.

Sahara: The Sahara is the largest hot desert in the world, covering North Africa. It spans over 9,200,000 square kilometers (3,600,000 sq mi) and is third in size compared to the deserts of Antarctica and the northern Arctic.

Taklamakan Desert: The Taklamakan Desert is a Southwestern Xinjiang desert in Northwest China. It lies within the Tarim Basin and is surrounded by the Kunlun Mountains, Pamir Mountains, Tian Shan range, and Gobi Desert.

Amazon rainforest: The Amazon rainforest, also known as Amazonia, is a vast tropical rainforest covering most of the Amazon basin in South America. It spans 7 million km2, with 5.5 million km2 covered by the rainforest. This region is home to nine nations and 3,344 formally acknowledged indigenous territories.

Sundarbans: The Sundarbans is the largest mangrove forest in the world, located in the delta formed by the Ganges, Brahmaputra, and Meghna Rivers. It stretches from the Baleswar River in Bangladesh to the Hooghly River in West Bengal, India. This unique area consists of closed and open mangrove forests, agricultural land, mudflats, and tidal streams. It is home to diverse flora and fauna, including the world's largest area of mangroves. The Sundarbans has four UNESCO World Heritage Sites, protecting its biodiversity and natural wonders.

Virgin Komi Forests: The Virgin Komi Forests is a massive UNESCO World Heritage Site in the Komi Republic, Russia. It covers 32,800 km², making it Europe's largest untouched forest. It is located in the Northern Ural Mountains.

Park: A park is a designated area for humans to enjoy nature and recreational activities, or for the conservation of wildlife and habitats. There are different types of parks including urban parks found in cities, national and country parks in rural areas, and state and provincial parks managed by sub-national government entities. Parks can have various features like grassy areas, trees, buildings, sports fields, paved paths, and water bodies. They provide spaces for activities like sports, walking, biking, and often offer amenities like benches, picnic tables, and barbecue grills.

National park: A national park is a government-protected area used for conservation, containing natural or developed land. It serves to preserve and display wild nature as a symbol of national pride. Typically, national parks are open to visitors.

World Heritage Site: A World Heritage Site is a protected landmark or area recognized by UNESCO for its outstanding cultural, historical, scientific, or other forms of importance. These sites have legal protection and are considered to possess exceptional value to humanity's cultural and natural heritage.

Banc d'Arguin National Park: Banc d'Arguin National Park is located on the west coast of Mauritania, between Nouakchott and Nouadhibou. It is a World Heritage Site known for its abundant birdlife, including flamingos, pelicans, and terns. The park is home to several breeding sites, mainly on sand banks and islands such as Tidra, Niroumi, Nair, Kijji, and Arguim. These surrounding waters are also rich fishing grounds and serve as nesting areas for the entire western region of Africa.

Kavango–Zambezi Transfrontier Conservation Area: The Kavango–Zambezi Transfrontier Conservation Area is a large conservation area in Southern Africa. It spans five countries and includes the Zambezi and Okavango basins, Caprivi Strip in Namibia, parts of Angola, Zambia, Botswana, and Zimbabwe. Notable features include the confluence of Zambezi and Chobe Rivers, Chobe National Park, Hwange National Park, and the Victoria Falls. With around 250,000 animals, it is home to the largest population of African Elephants in the world.

Ngorongoro Conservation Area: The Ngorongoro Conservation Area is a protected UNESCO World Heritage Site located in northern Tanzania. It is named after the Ngorongoro Crater, a volcanic caldera within the area. Administered by the Ngorongoro Conservation Area Authority, it shares a boundary with the Serengeti National Park and Kenya's Maasai Mara game reserve. The area is famous for the Great Migration, an annual spectacle of millions of wildebeest, zebras, and gazelles. Additionally, it encompasses the Olduvai Gorge, a significant paleoanthropological site.

Serengeti National Park: The Serengeti National Park is a vast park in northern Tanzania covering an area of 14,763 km2. It is situated in the Mara and Simiyu regions and boasts over 1,500,000 hectares of untouched savanna. The park, established in 1940, is renowned for its diverse wildlife and stunning landscapes.

Kaziranga National Park: Kaziranga National Park in Assam, India, is a UNESCO World Heritage Site known for hosting a significant population of Indian rhinoceroses. The park is home to two-thirds of the world's Indian rhinoceroses, with a population of 2,613 in 2018. It consists of 1,641 adult rhinos, 387 sub-adults, and 385 calves.

Lake District: The Lake District, located in North West England, is a stunning mountainous region and national park. Renowned for its breathtaking landscapes of mountains, lakes, and coastlines, it has inspired famous writers and poets like William Wordsworth, Beatrix Potter, and John Ruskin.

Banff National Park: Banff National Park, Canada's oldest national park, spans 6,641 square kilometers of mountainous terrain in Alberta's Rocky Mountains. It is home to glaciers, ice fields, dense forests, and alpine landscapes. The park shares borders with Yoho National Park and provincial forests to the west, Kootenay National Park to the south, and Kananaskis Country to the southeast. The town of Banff serves as the main commercial center within the park.

Central Park: Central Park is an urban park in Manhattan, New York City. It was the first landscaped park in the US, spanning 843 acres. As the largest and most visited urban park in the country, it attracts around 42 million visitors annually.

Great Smoky Mountains National Park: Great Smoky Mountains National Park is a popular American national park spanning North Carolina and Tennessee. It encompasses the Great Smoky Mountains, part of the Blue Ridge Mountains, and boasts some of the highest peaks in eastern North America. The park is traversed by the famous Appalachian Trail and attracts a massive number of visitors, making it the most visited national park in the United States.

Northeast Greenland National Park: Northeast Greenland National Park is the world's largest national park, covering 972,000 km2 (375,000 sq mi) of the interior and northeastern coast of Greenland. Established in 1974 and expanded in 1988, it is the only national park in Greenland and the northernmost in the world. It is also the 10th largest protected area globally and ranks second in size among second-level subdivisions, surpassed only by Qikiqtaaluk Region in Nunavut, Canada.

Yellowstone National Park: Yellowstone National Park is the first national park in the world, located in the western United States. It spans across Wyoming, Montana, and Idaho. Established in 1872, it is known for its wildlife, geothermal features like the Old Faithful geyser, and diverse biomes including the subalpine forest. This park is situated within the South Central Rockies forests ecoregion.

Yosemite National Park: Yosemite National Park is a California-based national park managed by the National Park Service. It covers 759,620 acres in four counties and is bordered by Sierra National Forest and Stanislaus National Forest. Yosemite is renowned for its breathtaking granite cliffs, waterfalls, clear streams, giant sequoia groves, lakes, mountains, meadows, glaciers, and diverse ecosystems. It holds the distinction of being designated a World Heritage Site in 1984 and boasts a sizable wilderness area, making it one of the largest and most pristine habitats in the Sierra Nevada.

Phoenix Islands Protected Area: The Phoenix Islands Protected Area (PIPA) is a massive marine protected area (MPA) located in the Republic of Kiribati. Covering 11.34% of Kiribati's exclusive economic zone, PIPA spans 408,250 km2 (157,630 sq mi), making it one of the largest MPAs and protected areas on Earth. In 2010, it was recognized as the world's largest and deepest UNESCO World Heritage Site.

Royal National Park: The Royal National Park is a protected area situated in Sydney, Australia. It covers the southern part of the city and falls under the Sutherland Shire local government.

Tumucumaque Mountains National Park: The Tumucumaque Mountains National Park is located in the Amazon Rainforest in Amapá and Pará, Brazil. It shares borders with French Guiana and Suriname.

Country: A country is a distinct political entity, which can be a sovereign state or a part of a larger state. It may have independent or unified governance and can be historically sovereign or associated with distinct political, ethnic, or cultural characteristics. Examples include Japan as a sovereign state and England, Scotland, and Wales as components of the United Kingdom.

Canada: Canada is a vast country in North America with ten provinces and three territories, stretching from the Atlantic Ocean to the Pacific Ocean and into the Arctic Ocean. It is the second-largest country by area and has the world's longest coastline as well as the longest international land border with the United States. Canada is known for its diverse meteorologic and geological regions. Despite its size, it is sparsely populated with 40 million people, mainly concentrated in urban areas south of the 55th parallel. Ottawa is the capital and Toronto, Montreal, and Vancouver are its largest metropolitan areas.

Mexico: Mexico, officially known as the United Mexican States, is a North American country bordered by the United States to the north, the Pacific Ocean to the south and west, and the Gulf of Mexico to the east. It is also surrounded by Guatemala, Belize, and the Caribbean Sea to the southeast. Mexico covers 1,972,550 km2, making it the 13th-largest country in the world. With a population of around 130 million, it ranks as the 10th-most populous country and holds the highest number of Spanish speakers. Mexico is a federal republic with 31 states and its capital is Mexico City.

United States: The United States of America (USA), commonly known as the United States (U.S.) or America, is a large country located in North America. It consists of 50 states, a federal district, and several territories. With a population of over 334 million, it is the most populous country in the Americas and the third-most populous in the world. The United States shares borders with Canada and Mexico and has maritime borders with other countries. Its capital is Washington, D.C., and its most populous city is New York City.

Belize: Belize is a country in Central America, bordered by Mexico, the Caribbean Sea, Guatemala, and Honduras. It covers an area of 22,970 square kilometers and has a population of 441,471. The country is known for being the least populated and least densely populated in Central America. It has a high population growth rate of 1.87% per year, and its capital is Belmopan, with Belize City being the largest city. Belize has a history as a British colony, resulting in English being its official language.

Costa Rica: Costa Rica, officially the Republic of Costa Rica, is a Central American country bordered by Nicaragua to the north, the Caribbean Sea to the northeast, Panama to the southeast, and the Pacific Ocean to the southwest. It has a population of approximately five million people and covers an area of 51,060 km2 (19,710 sq mi). The capital city, San José, is home to about two million people, with a total of 333,980 residents.

El Salvador: El Salvador, officially known as the Republic of El Salvador, is a Central American country bordered by Honduras, Guatemala, and the Pacific Ocean. San Salvador is the capital and largest city. With a population of approximately 6.5 million in 2023, it stands as a key nation in the region.

Guatemala: Guatemala, officially known as the Republic of Guatemala, is a densely populated country in Central America. It shares borders with Mexico, Belize, Honduras, and El Salvador, while also being touched by the Pacific Ocean and the Gulf of Honduras. With a population of approximately 17.6 million people, it is the most populous country in Central America and the 4th most populous in North America. Guatemala functions as a representative democracy, with its capital and largest city, Nueva Guatemala de la Asunción (Guatemala City), serving as the most populous city in Central America.

Honduras: Honduras is a country in Central America, bordered by Guatemala, El Salvador, and Nicaragua. It is also surrounded by the Pacific Ocean and the Gulf of Honduras. The capital of Honduras is Tegucigalpa.

Nicaragua: Nicaragua is the largest country in Central America, bordered by Honduras, the Caribbean Sea, Costa Rica, and the Pacific Ocean. Its capital, Managua, is the largest city. With a population of six million, it is a multiethnic nation with mestizo, Indigenous, European, and African heritage. Spanish is the main language, while Indigenous tribes on the Mosquito Coast speak their own languages and English.

Panama: Panama is a transcontinental country in Central America, extending from southern North America to the northern part of South America. It borders Costa Rica and Colombia, with the Caribbean Sea to the north and the Pacific Ocean to the south. Its capital, Panama City, is home to nearly half of its population of over 4 million people.

Argentina: Argentina, officially the Argentine Republic, is the second-largest country in South America and the eighth-largest in the world. It shares borders with Chile, Bolivia, Paraguay, Brazil, and Uruguay. Buenos Aires is the capital city and the largest in the country. Argentina is a federal state with 23 provinces and one autonomous city. It also claims sovereignty over the Falkland Islands, South Georgia and the South Sandwich Islands, the Southern Patagonian Ice Field, and a part of Antarctica.

Bolivia: Bolivia, officially the Plurinational State of Bolivia, is a landlocked country in western-central South America. It shares borders with Brazil, Paraguay, Argentina, Chile, and Peru. The capital is La Paz, housing the government branches, while Sucre is the constitutional capital. The largest city, Santa Cruz de la Sierra, is an industrial hub located in the flat eastern region known as the Llanos Orientales.

Brazil: Brazil is the largest country in South America and Latin America. Its capital is Brasília, and it is known for São Paulo, its most populous city. It is a federation comprised of 26 states and the Federal District. Portuguese is the official language and it is the only country in the Americas with this distinction. Brazil is culturally diverse due to immigration from around the world and is predominantly Roman Catholic.

Chile: Chile, the southernmost country in the world, borders Peru, Bolivia, and Argentina. It stretches along a narrow strip of land between the Andes Mountains and the Pacific Ocean. With an area of 756,102 square kilometers, Chile has a population of 17.5 million. It controls islands in the Pacific and claims a significant portion of Antarctica. Santiago is the capital and Spanish is the national language.

Colombia: Colombia is a country in South America, with some parts in North America. It is bordered by the Caribbean Sea, Venezuela, Brazil, Ecuador, Peru, the Pacific Ocean, and Panama. The capital city is Bogotá. Other important cities include Medellín, Cali, Barranquilla, and Cartagena. Colombia has a population of around 52 million and covers an area of 1,141,748 square kilometers. Its rich cultural heritage reflects influences from Europe, the Middle East, Africa, and indigenous civilizations. The official language is Spanish, but other languages are recognized regionally.

Ecuador: Ecuador is a country in northwestern South America, bordered by Colombia, Peru, and the Pacific Ocean. It includes the Galápagos Islands. The capital is Quito, but the largest city is Guayaquil.

Guyana: Guyana, also known as the Co-operative Republic of Guyana, is a country in northern South America. The name "Guyana" translates to "Land of Many Waters" in the indigenous language. Georgetown is the capital city. It is bordered by the Atlantic Ocean, Brazil, Venezuela, and Suriname. With an area of 215,000 sq km, it is the third-smallest sovereign state in mainland South America and has a low population density. Guyana boasts diverse natural habitats and is rich in biodiversity.

Paraguay: Paraguay, a landlocked country in South America, is bordered by Argentina, Brazil, and Bolivia. It has a population of around 6.1 million, with Asunción as its capital and largest city.

Peru: Peru, officially the Republic of Peru, is a country in western South America, with borders that include Ecuador, Colombia, Brazil, Bolivia, and Chile. It stretches from coastal plains in the west, through the Andes mountains, to the Amazon rainforest in the east. With over 32 million people, Lima is its capital and largest city. Peru is known for its incredible biodiversity and is the 19th largest country in the world and the third largest in South America.

Suriname: Suriname is a sovereign state in northern South America with over 90% rainforest cover, making it the country with the highest proportion of forest cover in the world. It is bordered by the Atlantic Ocean, French Guiana, Guyana, and Brazil. Suriname is the smallest country in South America with a population of around 612,985 and an area of approximately 163,820 square kilometers. The capital, Paramaribo, is home to approximately half of the population.

Uruguay: Uruguay, officially known as the Oriental Republic of Uruguay, is a country in South America. It shares borders with Argentina and Brazil, while being surrounded by the Río de la Plata and the Atlantic Ocean. With an area of about 181,034 square kilometers, it has a population of around 3.4 million people. The capital and largest city, Montevideo, is home to nearly 2 million residents. Uruguay is part of the Southern Cone region and boasts a significant metropolitan area.

Venezuela: Venezuela, officially the Bolivarian Republic of Venezuela, is a South American country with a landmass and islands in the Caribbean Sea. It spans an area of 916,445 km2 and has a population of around 29 million. The capital and largest city is Caracas.

Antigua and Barbuda: Antigua and Barbuda is a Caribbean island nation located in the Leeward Islands, at the meeting point of the Caribbean Sea and the Atlantic Ocean.

The Bahamas: The Bahamas is an island country located in the West Indies in the Atlantic Ocean. It consists of over 3,000 islands, cays, and islets, making up 97% of the Lucayan Archipelago's land area. The country is situated north of Cuba, southeast of Florida, and east of the Florida Keys. The capital is Nassau on the island of New Providence. The Bahamas has a population of 88% of the Lucayan Archipelago's total population. It has a vast territory encompassing 470,000 km2 (180,000 sq mi) of ocean space.

Barbados: Barbados is an island country in the Caribbean, situated in the Lesser Antilles. It is the most easterly of all the Caribbean islands and is located at the intersection of the South American and Caribbean Plates. The capital and largest city of Barbados is Bridgetown.

Cuba: Cuba, officially the Republic of Cuba, is an island country located where the Caribbean Sea, Gulf of Mexico, and Atlantic Ocean meet. It comprises the main island of Cuba, Isla de la Juventud, and numerous surrounding islands and cays. The capital city is Havana, while other major cities include Santiago de Cuba and Camagüey. With an area of 109,884 km2 (42,426 sq mi), Cuba is the second-most populous country in the Caribbean, home to over 11 million people.

Dominica: Dominica is an island country in the Caribbean, part of the Windward Islands chain. Its capital is Roseau. Dominica is surrounded by the overseas departments of France: Guadeloupe to the northwest and Martinique to the south-southeast. It covers a land area of 750 km2 and has a population of 71,293 people. The highest point is Morne Diablotins at 1,447 m.

Dominican Republic: The Dominican Republic is a country in the Caribbean Sea, sharing the island of Hispaniola with Haiti. It is the second-largest nation in the Antilles by area and population. Its capital city is Santo Domingo, which is home to around 3.6 million people.

Grenada: Grenada is a Caribbean island nation located south of Saint Vincent and the Grenadines. It is part of the Windward Islands and sits about 100 miles north of Trinidad and mainland South America.

Haiti: Haiti, officially the Republic of Haiti, is a Caribbean country on the island of Hispaniola, sharing it with the Dominican Republic. It is the third largest country in the Caribbean and has a population of 11.4 million. Its capital is Port-au-Prince.

Jamaica: Jamaica is an island country in the Caribbean Sea, the third largest in the Greater Antilles. It spans 10,990 square kilometers and is located south of Cuba and west of Hispaniola. The Cayman Islands are found to the northwest.

Saint Kitts and Nevis: Saint Kitts and Nevis is an island country in the West Indies, consisting of two islands in the Leeward Islands chain. It is the smallest sovereign state in the Western Hemisphere, both in terms of area and population. With 50,000 inhabitants, it covers 261 square kilometers and is the world's smallest sovereign federation. As a Commonwealth realm, it is headed by King Charles III.

Saint Lucia: Saint Lucia is a constitutional monarchy and island country in the West Indies. It was formerly known as Iouanalao and Hewanorra by the native Arawaks and Caribs, respectively. Situated in the eastern Caribbean, it is part of the Windward Islands. Saint Lucia has a land area of 617 km2 inhabited by over 180,000 people as of 2018. The capital and largest city is Castries.

Saint Vincent and the Grenadines: Saint Vincent and the Grenadines is an island nation in the eastern Caribbean, part of the Windward Islands. Situated at the southern end of the Caribbean Sea, it meets the Atlantic Ocean.

Trinidad and Tobago: Trinidad and Tobago is a southern Caribbean island country, consisting of the main islands Trinidad and Tobago, along with smaller islands. It is located 11 km off the coast of Venezuela and 130 km south of Grenada. The country shares maritime boundaries with Barbados, Grenada, and Venezuela. Trinidad and Tobago is considered part of the West Indies and has Port of Spain as its capital, with San Fernando being the largest and most populous city.

Comoros: The Comoros is an archipelagic country in Southeastern Africa, consisting of three islands. It is located in the Indian Ocean and its capital is Moroni. The majority of the population follows Sunni Islam, which is also the official state religion. Comoros gained independence from France in 1975 and is the only country in the Arab world entirely in the Southern Hemisphere. It is a member of various international organizations and has three official languages: Shikomori, French, and Arabic.

Djibouti: Djibouti is a country in the Horn of Africa, bordered by Somalia, Ethiopia, Eritrea, and the Red Sea. It has an area of 23,200 km2 (8,958 sq mi).

Eritrea: Eritrea, officially known as the State of Eritrea, is a country in Eastern Africa. It is located in the Horn of Africa region, with its capital city being Asmara. The nation shares borders with Ethiopia, Sudan, and Djibouti. Eritrea boasts a significant coastline along the Red Sea in its northeastern and eastern regions. It spans an area of about 117,600 sq km and includes islands such as the Dahlak Archipelago and the Hanish Islands.

Ethiopia: Ethiopia, officially the Federal Democratic Republic of Ethiopia, is a landlocked country in East Africa, bordered by Eritrea, Djibouti, Somalia, Kenya, South Sudan, and Sudan. It spans 1.1 million square kilometers and has a population of about 128 million, making it the second most populous country in Africa. The capital city is Addis Ababa, located in the western part of the country. Ethiopia is known for its strategic location in the Horn of Africa and its diverse landscapes, including the East African Rift Valley.

Kenya: Kenya, officially the Republic of Kenya, is an East African country with a population of over 47.6 million. It is the 28th most populous in the world and 7th in Africa. The capital and largest city is Nairobi, while Mombasa serves as a major port city. Mombasa was the capital during British colonial rule. Important cities include Kisumu and Nakuru. Kenya is bordered by South Sudan, Ethiopia, Somalia, Uganda, Tanzania, and the Indian Ocean. Its geography and climate vary greatly, with diverse landscapes from snow-capped mountains and forests to fertile agricultural regions and arid deserts.

Madagascar: Madagascar is a large island country off the southeastern coast of Africa. It is the world's fourth largest island and the 44th largest country overall. Its capital and biggest city is Antananarivo.

Malawi: Malawi, officially the Republic of Malawi, is a landlocked country in Southeastern Africa. It shares borders with Zambia, Tanzania, and Mozambique. Covering an area of 118,484 km2 (45,747 sq mi), Malawi has a population of approximately 19.4 million. The capital city is Lilongwe, while Blantyre, Mzuzu, and the former capital, Zomba, are other major urban centers.

Mauritius: Mauritius is an island country located in the Indian Ocean, off the coast of East Africa. It is composed of the main island, Rodrigues, Agaléga, and St. Brandon. The capital city, Port Louis, is situated on the main island, which has the highest population. Together with Réunion, the islands form the Mascarene Islands. The country covers an area of 2,040 square kilometres, with an exclusive economic zone of 2,300,000 square kilometres.

Mozambique: Mozambique is a country in southeastern Africa, bordered by the Indian Ocean, Tanzania, Malawi, Zambia, Zimbabwe, Eswatini, and South Africa. It is separated from Comoros, Mayotte, and Madagascar by the Mozambique Channel. The capital is Maputo.

Seychelles: Seychelles is an archipelagic state in the Indian Ocean, composed of 115 islands located east of mainland Africa. Victoria, its capital and largest city, is 1,500 kilometers away from the mainland. In its vicinity, there are neighboring island countries such as Comoros, Madagascar, Mauritius, and French overseas departments. To the east lie Maldives and the Chagos Archipelago. Seychelles holds the distinction of being the smallest and least populated country in Africa, with an estimated population of 100,600 in 2022.

Somalia: Somalia is a country in the Horn of Africa with a population of 17.1 million. It has the longest coastline on Africa's mainland and is bordered by Ethiopia, Djibouti, the Gulf of Aden, the Indian Ocean, and Kenya. The terrain is mainly plateaus, plains, and highlands, with a hot climate and irregular rainfall. Mogadishu is the capital and largest city, home to over 2 million people. The country is known for its cultural homogeneity, with around 85% of residents being ethnic Somalis. The official languages are Somali and Arabic, and the majority of people practice Sunni Islam.

South Sudan: South Sudan, officially the Republic of South Sudan, is a landlocked country in eastern Central Africa. It shares borders with Ethiopia, Sudan, the Central African Republic, the Democratic Republic of the Congo, Uganda, and Kenya. With a population estimated at 11,088,796 in 2023, its capital and largest city is Juba.

Tanzania: Tanzania is a country in East Africa known for its location within the African Great Lakes region. It shares borders with Uganda, Kenya, Mozambique, Malawi, Zambia, Rwanda, Burundi, and the Democratic Republic of the Congo. Mount Kilimanjaro, Africa's tallest mountain, is found in northeastern Tanzania. With a population of approximately 62 million, Tanzania is the most populous country south of the equator.

Uganda: Uganda, a landlocked country in East Africa, is bordered by Kenya, South Sudan, the Democratic Republic of the Congo, Rwanda, and Tanzania. It lies within the Nile basin and is part of the African Great Lakes region. The country has a varied equatorial climate and is home to a significant portion of Lake Victoria. With a population of around 49.6 million, the capital city of Uganda is Kampala, where 8.5 million people reside.

Zambia: Zambia is a landlocked country in South-Central Africa, bordered by several nations including the Democratic Republic of the Congo, Tanzania, and Zimbabwe. Its capital is Lusaka, and the population is concentrated in the south around Lusaka and the Copperbelt Province.

Zimbabwe: Zimbabwe is a landlocked country in Southern Africa, bordered by South Africa, Botswana, Zambia, and Mozambique. Its capital is Harare, and the largest city is Bulawayo.

Benin: Benin, formerly Dahomey, is a small West African country. It shares borders with Togo, Nigeria, Burkina Faso, and Niger. The majority of its population lives along the southern coastline of the Bight of Benin. Porto-Novo is the capital city, while Cotonou serves as the most populous city and economic center. With an area of 114,763 square kilometers, Benin has a population of around 13 million people. The country's economy heavily relies on agriculture, particularly palm oil and cotton exports. Additionally, subsistence farming provides some employment and income.

Burkina Faso: Burkina Faso is a landlocked country in West Africa, bordered by Mali, Niger, Benin, Togo, Ghana, and Ivory Coast. With an estimated population of 20,321,378, its capital is Ouagadougou. Formerly known as the Republic of Upper Volta, it was renamed Burkina Faso by President Thomas Sankara. The country covers an area of 274,223 km² and is often translated as the "Land of Honest Men."

Cape Verde: Cape Verde, or Cabo Verde, is an island nation in West Africa, located in the central Atlantic Ocean. It consists of ten volcanic islands with a total land area of about 4,033 square kilometers. The islands are situated between 600 and 850 kilometers west of mainland Africa's westernmost point. Cape Verde is part of the Macaronesia ecoregion, which includes the Azores, the Canary Islands, Madeira, and the Savage Isles.

The Gambia: The Gambia, officially the Republic of The Gambia, is the smallest country in Africa located in West Africa. It is surrounded by Senegal, except for its western coast along the Atlantic Ocean. The country is defined by the Gambia River, which runs through its center and empties into the ocean. With a population of 2,468,569 people, its capital city is Banjul, while Serekunda and Brikama are other major cities. The Gambia covers an area of 11,300 square kilometers (4,400 sq mi).

Ghana: Ghana, officially the Republic of Ghana, is a West African country. It shares borders with Ivory Coast, Burkina Faso, and Togo. Ghana covers an area of 239,567 km2 (92,497 sq mi) and has diverse landscapes including savannas and rainforests. It has a population of over 32 million, making it the second-most populous country in West Africa. The capital is Accra, with other major cities being Kumasi, Tamale, and Sekondi-Takoradi.

Guinea: Guinea, officially known as the Republic of Guinea, is a coastal country in West Africa. It shares borders with Guinea-Bissau, Senegal, Mali, Cote d'Ivoire, Sierra Leone, and Liberia. The country is often called Guinea-Conakry after its capital city, Conakry. With a population of 14 million, Guinea covers an area of 245,857 sq km (94,926 sq mi).

Guinea-Bissau: Guinea-Bissau is a West African country with an area of 36,125 square kilometres and a population of around 2 million. It shares borders with Senegal to the north and Guinea to the southeast.

Ivory Coast: Ivory Coast, officially known as the Republic of Côte d'Ivoire, is a West African country with Yamoussoukro as its capital and Abidjan as its largest city and economic center. It shares borders with Guinea, Liberia, Mali, Burkina Faso, Ghana, and the Gulf of Guinea. French is the official language, while various indigenous languages are also spoken. The country is linguistically diverse, with around 78 different languages used. Ivory Coast has a religiously diverse population that includes Islam, Christianity, and traditional faiths like Animism.

Liberia: Liberia is a West African country with a population of around 5 million and covers an area of 43,000 square miles. It shares borders with Sierra Leone, Guinea, and Ivory Coast, while the Atlantic Ocean surrounds it. The official language is English, but the country's diversity is reflected in its use of over 20 indigenous languages. Monrovia serves as both the capital and largest city.

Mali: Mali is a landlocked country in West Africa, bordering Algeria, Niger, Mauritania, Burkina Faso, Côte d'Ivoire, Guinea, and Senegal. It covers an area of 1.2 million square kilometers and has a population of 21.9 million. The country's capital is Bamako. Mali is the eighth-largest country in Africa and has 13 official languages, with Bambara being the most widely spoken.

Mauritania: Mauritania is a country in Northwest Africa, bordered by the Atlantic Ocean, Western Sahara, Algeria, Mali, and Senegal. It is the 11th-largest country in Africa, with 90% of its territory situated in the Sahara desert. Its population of approximately 4.3 million mostly resides in the southern region, with one-third concentrated in the capital city of Nouakchott on the Atlantic coast.

Niger: Niger, officially the Republic of the Niger, is a landlocked country in West Africa, bordering Libya, Chad, Nigeria, Benin, Burkina Faso, Mali, and Algeria. Covering a land area of almost 1,270,000 km2, it is the largest landlocked country in West Africa, with over 80% of its land lying in the Sahara. With a predominantly Muslim population of about 25 million, most live in the south and west of the country. The capital city, Niamey, is located in the southwest corner of Niger.

Nigeria: Nigeria is a federal republic in West Africa, bordered by Niger, Chad, Cameroon, and Benin. It covers an area of 923,769 square kilometres, with a population of over 230 million, making it the most populous country in Africa and the sixth-most populous in the world. Its capital is Abuja, and the largest city is Lagos, which is one of the world's largest metropolitan areas.

Senegal: Senegal, officially the Republic of Senegal, is a West African country with coastlines along the Atlantic Ocean. It shares borders with Mauritania, Mali, Guinea, and Guinea-Bissau, and almost surrounds The Gambia. Cape Verde is its maritime neighbor. The capital of Senegal is Dakar, which is both its economic and political center.

Sierra Leone: Sierra Leone is a country in West Africa, bordered by Liberia and Guinea. Its total area is 71,740 km2 with a population of 7,092,113. The capital and largest city is Freetown. The country has a tropical climate with diverse environments and is divided into five administrative regions and 16 districts.

Togo: Togo, officially the Togolese Republic, is a small, tropical country in West Africa. It is bordered by Ghana, Benin, and Burkina Faso. Despite being one of the least developed countries, it extends to the Gulf of Guinea and has a population of around 8 million. Its capital, Lomé, is located on the coast. Togo covers 57,000 square kilometers with a narrow width of less than 115 km between Ghana and Benin.

Algeria: Algeria is a North African country, bordering Tunisia, Libya, Niger, Mali, Mauritania, Western Sahara, Morocco, and the Mediterranean Sea. It is part of the Maghreb region and has a semi-arid geography. The country is the tenth largest in the world and the largest in Africa. The population of 44 million makes it the tenth-most populous country in Africa, with Algiers as its capital and largest city.

Egypt: Egypt, officially called the Arab Republic of Egypt, is a country spanning Africa and Asia. It is surrounded by the Mediterranean Sea, Palestine and Israel, the Red Sea, Sudan, and Libya. Egypt's capital is Cairo, while Alexandria is a major city on the Mediterranean coast. With a population of about 100 million people, Egypt is the 14th most populous country globally and the third most in Africa after Nigeria and Ethiopia.

Libya: Libya is a North African country that shares borders with several nations, including Egypt and Algeria. It encompasses three historical regions and has a land area of about 1.8 million square kilometers. The majority of Libyans adhere to Islam, and Arabic is the official language. The capital city, Tripoli, is home to a significant portion of the country's population.

Morocco: Morocco is a country in North Africa, sharing borders with Algeria and Western Sahara. It has a coastline along the Mediterranean Sea and the Atlantic Ocean. Morocco also claims Spanish enclaves and small islands. The country spans an area of around 446,550 km2 and has a population of about 37 million. Islam is the main religion, and Arabic and Berber are the official languages. Moroccan culture is a blend of Arab, Berber, African, and European influences. Rabat is the capital, and Casablanca is the largest city.

Sudan: Sudan, officially the Republic of the Sudan, is a country in Northeast Africa. It shares borders with several countries, including Central African Republic, Chad, Egypt, Eritrea, Ethiopia, Libya, and South Sudan. With a population of around 45.7 million people, Sudan covers 1.88 million square kilometers, making it the third-largest country in Africa and the Arab League. Previously the largest in both regions until South Sudan separated in 2011. Khartoum serves as the capital city, while Omdurman is the most populous city in Sudan.

Tunisia: Tunisia, officially the Republic of Tunisia, is the northernmost country in Africa and part of the Maghreb region. It borders Algeria, Libya, and the Mediterranean Sea. Tunisia is known for its ancient archaeological sites like Carthage and the Great Mosque of Kairouan, as well as its vibrant souks and blue coasts. The country spans 163,610 km2 and has a population of 12.1 million. It boasts a diverse landscape with the Atlas Mountains, Sahara desert, and fertile arable land. Tunisia's capital and largest city is Tunis, located on the northeastern coast.

Botswana: Botswana is a landlocked country in Southern Africa, known for its flat terrain and the Kalahari Desert. It shares borders with South Africa, Namibia, and Zimbabwe, and is connected to Zambia by the Kazungula Bridge, which boasts the world's shortest border between two countries. The official name of the country is the Republic of Botswana.

Eswatini: Eswatini, formerly known as Swaziland, is a small landlocked country in Southern Africa. It shares borders with Mozambique and South Africa. Despite its small size, Eswatini offers diverse climates and landscapes, from cool mountains to hot and dry lowlands.

Lesotho: Lesotho, or the Kingdom of Lesotho, is a landlocked country in Southern Africa and the only sovereign enclave outside of the Italian Peninsula. It shares a border with South Africa and is situated in the Maloti Mountains, home to Southern Africa's highest peak. With over 30,000 km2 of area, it has a population of around 2 million people. Maseru serves as its capital and largest city.

Namibia: Namibia, officially the Republic of Namibia, is a Southern African country with the Atlantic Ocean to its west. It shares borders with Zambia, Angola, Botswana, and South Africa. Although no direct border with Zimbabwe, the two countries are separated by less than 200 meters of the Zambezi River. The capital and largest city of Namibia is Windhoek.

South Africa: South Africa, the southernmost country in Africa, is bordered by Namibia, Botswana, Zimbabwe, Mozambique, and Eswatini. It also completely surrounds Lesotho. It has a diverse range of plant and animal life and is known for being a biodiversity hotspot. With a population of over 62 million people, it is the 23rd-most populous nation in the world. The country covers an area of 1,221,037 square kilometers. Pretoria is the administrative capital, Cape Town is the legislative capital, and Bloemfontein is the judicial capital. Johannesburg is the largest city and the location of the highest court.

Angola: Angola, officially the Republic of Angola, is the seventh-largest country in Africa and the second-largest Portuguese-speaking country. It is located on the west-central coast of Southern Africa and shares borders with Namibia, the Democratic Republic of the Congo, and Zambia. Angola also has an exclave province called Cabinda. The capital and largest city is Luanda.

Burundi: Burundi is a landlocked country in East Africa, situated in the Great Rift Valley. It is bordered by Rwanda, Tanzania, and the Democratic Republic of the Congo. Lake Tanganyika lies along its southwestern border. The capital cities are Gitega and Bujumbura, the largest city in the country.

Cameroon: Cameroon is a country in Central Africa bordered by Nigeria, Chad, the Central African Republic, and Equatorial Guinea, Gabon, and the Republic of the Congo. It has a strategic location between West and Central Africa. The country has a population of nearly 27 million people who speak 250 native languages, in addition to English and French, the national languages. The coastline lies on the Bight of Biafra and the Gulf of Guinea.

Central African Republic: The Central African Republic (CAR) is a landlocked country in Central Africa, bordered by Chad, Sudan, South Sudan, the Democratic Republic of the Congo, the Republic of the Congo, and Cameroon. Its capital and largest city is Bangui. CAR covers an area of about 620,000 square kilometres and has an estimated population of 5.5 million. Currently, CAR is experiencing a civil war that began in 2012 and is ongoing as of 2024.

Chad: Chad is a landlocked country in North and Central Africa, bordered by Libya, Sudan, Central African Republic, Cameroon, Nigeria, and Niger. It has a population of 16 million, with N'Djamena as the capital and largest city.

Democratic Republic of the Congo: The Democratic Republic of the Congo, also known as Congo-Kinshasa or DRC, is a country in Central Africa. It is the second-largest country in Africa and the 11th-largest in the world. With a population of around 112 million, it is the most populous officially Francophone country. Its capital and largest city is Kinshasa. The DRC shares borders with multiple countries and is also bordered by the South Atlantic Ocean.

Republic of the Congo: The Republic of the Congo, also known as Congo-Brazzaville, is a country in Central Africa, bordered by Gabon, Cameroon, the Central African Republic, the Democratic Republic of the Congo, and the Atlantic Ocean.

Equatorial Guinea: Equatorial Guinea, a country in central Africa, was once a Spanish colony. It is located near the Equator and is part of the African region called Guinea. With a population of 1,468,777, majority of the people belong to the Fang ethnic group. The Bubi people, indigenous to Bioko island, form the second largest group. The country covers an area of 28,000 square kilometers.

Gabon: Gabon, officially known as the Gabonese Republic, is a country in Central Africa, bordered by Equatorial Guinea, Cameroon, the Republic of the Congo, and the Gulf of Guinea. It has an area of 270,000 square kilometres and a population of 2.3 million. Gabon boasts diverse landscapes, including coastal plains, mountains, and a savanna in the east. The capital city of Gabon is Libreville, which is also the largest city.

Rwanda: Rwanda, a landlocked country in Central Africa, is known as the "land of a thousand hills" due to its mountainous terrain. It is surrounded by Uganda, Tanzania, Burundi, and the Democratic Republic of the Congo. With a temperate to subtropical climate, Rwanda experiences two wet and two dry seasons annually. The country is renowned for its numerous lakes and is part of the African Great Lakes region. Despite its small size, Rwanda is the most densely populated mainland African country and is ranked fifth globally. Kigali serves as both the capital and largest city of Rwanda.

São Tomé and Príncipe: São Tomé and Príncipe is an island country located in the Gulf of Guinea, off the coast of Central Africa. It is officially known as the Democratic Republic of São Tomé and Príncipe.

China: China, or the People's Republic of China, is an East Asian country with a population of over 1.4 billion, making it the world's second-most populous country. It spans the equivalent of five time zones and shares land borders with fourteen other countries. With an area of 9.6 million square kilometers, it is the third-largest country by land area. China is divided into provinces, autonomous regions, municipalities, and special administrative regions. Beijing serves as the national capital, while Shanghai is the largest city and a major financial hub.

Japan: Japan is an island country in East Asia, located in the northwest Pacific Ocean. It is part of the Ring of Fire and consists of a 14,125 island archipelago. The five main islands are Hokkaido, Honshu, Shikoku, Kyushu, and Okinawa. Tokyo is the capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto.

Mongolia: Mongolia is a sparsely populated, landlocked country in East Asia, bordered by Russia to the north and China to the south. It is known for being the world's largest landlocked country without a closed sea. Its vast territory of 1,564,116 square kilometers is covered with grassy steppe, with mountains to the north and west and the Gobi Desert to the south. Ulaanbaatar, the capital and largest city, is home to about half of the country's population of 3.3 million.

North Korea: North Korea, officially the Democratic People's Republic of Korea, is a country in East Asia located on the northern half of the Korean Peninsula. It borders China and Russia to the north and South Korea to the south. The western border is the Yellow Sea, while the eastern border is the Sea of Japan. North Korea claims to be the legitimate government of the entire peninsula and adjacent islands. Pyongyang is the capital and largest city.

South Korea: South Korea, formally known as the Republic of Korea (ROK), is an East Asian country situated in the southern part of the Korean Peninsula. It shares a border with North Korea through the Korean Demilitarized Zone and is bounded by the Yellow Sea to the west and the Sea of Japan to the east. South Korea claims authority over the entire peninsula and neighboring islands. With a population of 51.96 million, it boasts the Seoul Capital Area, one of the world's most densely populated metropolitan regions. Noteworthy cities include Incheon, Busan, and Daegu.

Brunei: Brunei, formally Brunei Darussalam, is a Southeast Asian country on the island of Borneo. It is surrounded by Sarawak, Malaysia, except for its coastline on the South China Sea. With a population of 460,345, it is the only sovereign state entirely on Borneo. The capital, Bandar Seri Begawan, is home to approximately 100,000 people. Brunei follows an absolute monarchy governed by the Sultan, and its legal system is a mixture of English common law and sharia influenced by Islam.

Cambodia: Cambodia, officially the Kingdom of Cambodia, is a mainland Southeast Asian country with an area of 181,035 square kilometers. It is bordered by Thailand, Laos, Vietnam, and the Gulf of Thailand. The capital and largest city is Phnom Penh.

East Timor: East Timor, or Timor-Leste, is a Southeast Asian country comprising the eastern half of Timor island, with Indonesia administering the western half. It includes the exclave of Oecusse and the minor islands of Atauro and Jaco. Australia is its southern neighbor, separated by the Timor Sea. With a size of 14,874 square kilometers, Dili serves as its capital and largest city.

Indonesia: Indonesia is a Southeast Asian and Oceanic country consisting of over 17,000 islands. It is the world's largest island country, covering an area of 1,904,569 square kilometres. With a population of over 279 million people, it is the world's fourth-most populous country and the most populous Muslim-majority nation. Java, the most populous island, is home to over half of Indonesia's population.

Laos: Laos, officially known as the Lao People's Democratic Republic, is a landlocked country in Southeast Asia. It shares borders with Myanmar, China, Vietnam, Cambodia, and Thailand. Vientiane serves as its capital and largest city.

Malaysia: Malaysia is a Southeast Asian country, consisting of 13 states and three federal territories. It is divided into two regions: Peninsular Malaysia and Borneo's East Malaysia. Kuala Lumpur is the national capital and largest city. Putrajaya serves as the administrative center. With a population of over 33 million, Malaysia is a constitutional monarchy. It shares borders and maritime boundaries with Thailand, Singapore, Vietnam, Indonesia, Brunei, and the Philippines. Malaysia is known for its tropical climate and rich biodiversity, being one of the 17 megadiverse countries. Tanjung Piai in Johor is the southernmost point of continental Eurasia.

Myanmar: Myanmar, also known as Burma, is the largest country in Mainland Southeast Asia with a population of approximately 55 million. It is bordered by Bangladesh, India, China, Laos, and Thailand, and has access to the Andaman Sea and Bay of Bengal. The capital city is Naypyidaw, and the largest city is Yangon.

Philippines: The Philippines is an archipelagic country in Southeast Asia, consisting of 7,641 islands in the western Pacific Ocean. It is bounded by the South China Sea, the Philippine Sea, and the Celebes Sea. It shares maritime borders with several countries. The Philippines is known for its diverse ethnicities and cultures, and Manila is its capital and most populated city.

Singapore: Singapore is an island country in Southeast Asia, located near the equator. It borders the Strait of Malacca to the west, the Singapore Strait to the south, and the South China Sea to the east. The country has one main island and several satellite islands, with a total area that has increased by 25% due to land reclamation. Singapore has a high population density but also offers green spaces. It is multicultural, with four official languages: English, Malay, Mandarin, and Tamil. The country values multi-racialism and incorporates it into various national policies.

Thailand: Thailand, also known as the Kingdom of Thailand or Siam, is a country in Southeast Asia on the Indochinese Peninsula. With a population of nearly 70 million people, it covers an area of 513,120 square kilometers. Thailand shares borders with Myanmar, Laos, Cambodia, Malaysia, and maritime borders with Vietnam, Indonesia, and India. Bangkok serves as the capital and largest city of Thailand.

Vietnam: Vietnam, officially known as the Socialist Republic of Vietnam, is a country in Southeast Asia. It has a land area of 331,700 square kilometers and a population of over 100 million, making it the 15th most populous country in the world. Vietnam shares borders with China, Laos, and Cambodia, and has maritime borders with Thailand, the Philippines, Indonesia, and Malaysia. Its capital is Hanoi and its largest city is Ho Chi Minh City.

Armenia: Armenia, officially the Republic of Armenia, is a landlocked country in West Asia, bordered by Turkey, Georgia, Azerbaijan, Iran, and Nakhchivan. Yerevan is its capital and largest city.

Azerbaijan: Azerbaijan is a transcontinental country located at the boundary of Eastern Europe and West Asia. It is part of the South Caucasus region and bordered by Russia, Georgia, Armenia, Turkey, and Iran. The capital and largest city is Baku.

Bahrain: Bahrain is an island country in West Asia, located in the Persian Gulf. It consists of 50 natural and 33 artificial islands, with Bahrain Island being the largest. Connected to Saudi Arabia by the King Fahd Causeway, Bahrain has a population of 1,501,635 people, of which 712,362 are Bahraini nationals. With a landmass of 760 square kilometers, it is the third-smallest nation in Asia. The capital and largest city is Manama.

Cyprus: Cyprus is an island country in the eastern Mediterranean Sea, part of West Asia but culturally Southeast European. It is the third-largest and third-most populous island in the Mediterranean. Its capital is Nicosia. Northern Cyprus is governed by the Turkish Republic of Northern Cyprus.

Georgia (country): Georgia is a transcontinental country located in Eastern Europe and West Asia. It is in the Caucasus region, bordered by the Black Sea, Russia, Turkey, Armenia, and Azerbaijan. It covers an area of 69,700 square kilometers and has a population of 3.7 million people. Tbilisi is the capital and largest city, hosting about one-third of the Georgian population.

Iran: Iran, also known as Persia, is a West Asian country bordered by Iraq, Turkey, Azerbaijan, Armenia, the Caspian Sea, Turkmenistan, Afghanistan, Pakistan, the Gulf of Oman, and the Persian Gulf. With an area of 1.648 million square kilometers, it is the world's 17th-largest country. Iran has a population of around 90 million, making it the world's 17th most populous country. Tehran is its capital and largest city, with approximately 16 million people in its metropolitan area.

Iraq: Iraq, officially known as the Republic of Iraq, is an Arab-majority country in the Middle East, with a population of over 46 million. It is a federal parliamentary republic comprising 18 governorates. Iraq is bordered by Turkey, Iran, the Persian Gulf, Kuwait, Saudi Arabia, Jordan, and Syria. The capital city is Baghdad. The country is known for its diverse population, geography, and wildlife. Most Iraqis are Muslims, but minority religions like Christianity, Yazidism, Mandaeism, Yarsanism, and Zoroastrianism exist. Arabic and Kurdish are the official languages, while Turkish, Suret (Assyrian), and Armenian are also recognized in specific regions.

Israel: Israel is a country in West Asia, bordered by Lebanon, Syria, Jordan, the Red Sea, Egypt, and the Mediterranean Sea. Its financial hub is Tel Aviv and its seat of government is in Jerusalem, although international recognition of Israeli sovereignty over East Jerusalem is lacking.

Jordan: Jordan is a West Asian country located in the Levant region, bordered by Saudi Arabia, Iraq, Syria, the Palestinian West Bank, and Israel. It has a coastline on the Red Sea and the Dead Sea on its western border. The capital and largest city is Amman, which serves as the economic, political, and cultural center of the country.

Kuwait: Kuwait is a Middle Eastern country located on the northern edge of Eastern Arabia, at the tip of the Persian Gulf. It shares borders with Iraq and Saudi Arabia, and has maritime borders with Iran. The capital city is Kuwait City, where the majority of the population resides. As of 2022, the population is 4.45 million, with 1.45 million being Kuwaiti citizens and 3 million foreign nationals from over 100 countries. Kuwait has a coastal length of approximately 500 km (311 mi).

Lebanon: Lebanon, officially known as the Republic of Lebanon, is a West Asian country situated at the crossroads of the Mediterranean Basin and the Arabian hinterlands. Its diverse cultural identity is shaped by religious diversity. With a population of over five million, the country covers an area of 10,452 square kilometers. Beirut serves as the capital and largest city, while Tripoli and Jounieh are other major cities. While Arabic is the official language, French is also recognized, and English is widely spoken. The country's strategic location and rich history contribute to its significance in the region.

Oman: Oman is a West Asian country located on the southeastern coast of the Arabian Peninsula. It shares land borders with Saudi Arabia, United Arab Emirates, and Yemen, and maritime borders with Iran and Pakistan. The capital is Muscat and it has a population of nearly 4.7 million. The coast is bounded by the Arabian Sea and the Gulf of Oman. Oman also includes two exclaves, Madha and Musandam, surrounded by United Arab Emirates.

Qatar: Qatar, officially known as the State of Qatar, is a West Asian country situated on the Qatar Peninsula in the Middle East. It borders Saudi Arabia to the south and is surrounded by the Persian Gulf. The capital city is Doha, which is home to the majority of the population. Qatar is predominantly desert and features a flat and low-lying landscape.

Saudi Arabia: Saudi Arabia, officially known as the Kingdom of Saudi Arabia (KSA), is a country in West Asia, covering most of the Arabian Peninsula. It is the largest nation in the Middle East and the fifth largest in Asia, with a land area of 2,150,000 km². It shares borders with Jordan, Iraq, and Kuwait to the north, the Red Sea to the west, the Persian Gulf, Qatar, and the United Arab Emirates to the east, Oman to the southeast, and Yemen to the south. Bahrain, an island country, lies off its east coast. Saudi Arabia is the exclusive country with coastlines along both the Red Sea and the Persian Gulf. Its landscape primarily consists of arid deserts, lowlands, steppe, and mountains. Riyadh, its capital and largest city, is home to important Islamic sites including Mecca and Medina.

Syria: Syria, officially the Syrian Arab Republic, is a West Asian country with diverse ethnic and religious groups. Its geography includes fertile plains, high mountains, and deserts. The country is bordered by the Mediterranean Sea, Turkey, Iraq, Jordan, and Israel and Lebanon. Syria is a unitary republic with 14 subdivisions and its largest city is Damascus. The majority of Syrians are Arabs, and the largest religion is Sunni Islam. Syria is governed by Ba'athists, who promote Arab socialism and nationalism.

Turkey: Turkey, officially the Republic of Türkiye, is a country located in Southeast Europe and West Asia. It occupies the Anatolian Peninsula in West Asia and has a small portion known as East Thrace on the Balkan Peninsula. Turkey shares borders with several countries including Georgia, Armenia, Azerbaijan, Iran, Iraq, Syria, Greece, and Bulgaria. The country is surrounded by the Black Sea to the north, the Mediterranean and Aegean Seas to the south, and Cyprus off its south coast. Turkish and Kurds are the main ethnic groups, with Ankara as the capital and Istanbul as the largest city and economic hub in Europe.

United Arab Emirates: The United Arab Emirates (UAE) is a country in West Asia on the eastern end of the Arabian Peninsula. It shares borders with Oman and Saudi Arabia, and has maritime borders with Qatar and Iran. Abu Dhabi is the capital, while Dubai is a bustling international city.

Yemen: Yemen is a West Asian country located at the southern end of the Arabian Peninsula. It shares borders with Saudi Arabia and Oman, as well as maritime borders with Eritrea, Djibouti, and Somalia. With an area of 530,000 square kilometers and a 2,000-kilometer coastline, Yemen is the second-largest Arab sovereign state in the region. Sanaa serves as its capital and largest city. The country has an estimated population of 34.7 million as of 2023. Yemen is a member of the Arab League, the United Nations, the Non-Aligned Movement, and the Organisation of Islamic Cooperation.

Afghanistan: Afghanistan, a landlocked country in Central and South Asia, is known as the Heart of Asia and is bordered by Pakistan, Iran, Turkmenistan, Uzbekistan, Tajikistan, and China. With a predominantly mountainous terrain, it is home to plains in the north and southwest, divided by the Hindu Kush mountain range. Kabul is both its largest city and capital. As of 2021, the population stands at around 40.2 million, as per World Population review, while the National Statistics Information Authority approximated it to be 32.9 million in 2020.

Bangladesh: Bangladesh is a densely populated country in South Asia, sharing borders with India and Myanmar. It has a population of nearly 170 million in an area of 148,460 square kilometers. The capital and largest city is Dhaka, known for being a political, financial, and cultural center. The country has a busy port in Chittagong and a coastline along the Bay of Bengal. Bengali is the official language of Bangladesh.

Bhutan: Bhutan, officially known as the Kingdom of Bhutan, is a landlocked country in the Eastern Himalayas, situated between China and India. It is a mountainous country also referred to as "Druk Yul" or "Land of the Thunder Dragon". Bhutan gets its name from its close proximity to Tibet. Despite being near Nepal and Bangladesh, it does not share a border with them. With a population of over 727,145 and a territory of 38,394 square kilometres, Bhutan is a constitutional monarchy with a king as the head of state and a prime minister leading the government. Vajrayana Buddhism is the state religion, with the Je Khenpo as its head.

India: India, officially the Republic of India, is a populous South Asian country, known for being the world's most populous democracy. It is the seventh-largest country, sharing borders with Pakistan, China, Nepal, Bhutan, Bangladesh, and Myanmar. Surrounded by the Indian Ocean, Arabian Sea, and Bay of Bengal, India is also close to Sri Lanka and the Maldives. The Andaman and Nicobar Islands form maritime borders with Thailand, Myanmar, and Indonesia.

Maldives: The Maldives, officially the Republic of Maldives, is an archipelagic state in South Asia. The name "Maldives" means "the islands of Male" and it may also mean "garland of islands." It is located in the Indian Ocean, southwest of Sri Lanka and India. The country consists of 26 atolls stretching across the equator, with the capital city of Male on the main island. With its stunning islands and crystal-clear waters, the Maldives is a popular tourist destination.

Nepal: Nepal is a landlocked country in South Asia, bordered by China and India. It has diverse geography, including fertile plains and the Himalayas. The nation is known for having eight of the world's tallest mountains, including Mount Everest. Kathmandu is the capital and largest city. Nepal is a multi-ethnic, multi-lingual, multi-religious, and multi-cultural state, with Nepali as the official language.

Pakistan: Pakistan is a densely populated country in South Asia, with a large Muslim population. Its capital is Islamabad, and Karachi serves as its biggest city and financial hub. Pakistan is the world's fifth-most populous country and the second largest in South Asia. It shares borders with India, Afghanistan, Iran, and China, while also having a maritime border with Oman. The country is geographically diverse, bordered by the Arabian Sea and the Gulf of Oman.

Sri Lanka: Sri Lanka, formerly Ceylon, is an island nation located in South Asia. It is separated from the Indian peninsula by the Gulf of Mannar and the Palk Strait, and shares maritime borders with the Maldives and India.

Kazakhstan: Kazakhstan is a landlocked country in Central Asia and Eastern Europe, bordered by Russia, China, Kyrgyzstan, Uzbekistan, and Turkmenistan, with a coastline along the Caspian Sea. Its capital is Astana, while the largest city is Almaty. It is the world's ninth-largest country by land area and has a population of 20 million. Kazakhstan has a diverse population with ethnic Kazakhs as the majority and ethnic Russians as a significant minority. The country is officially secular and has a Muslim-majority, with a sizable Christian community.

Kyrgyzstan: Kyrgyzstan, officially known as the Kyrgyz Republic, is a landlocked country in Central Asia. Its capital and largest city is Bishkek. It is bordered by Kazakhstan, Uzbekistan, Tajikistan, and China. With a population of 6.7 million, it is the 34th-most populous country in Asia and the 4th-most populous in Central Asia. The majority of the population is ethnic Kyrgyz, with significant minorities of Uzbeks and Russians. The country is located in the Tian Shan and Pamir mountain ranges.

Tajikistan: Tajikistan is a Central Asian country, bordered by Afghanistan, Uzbekistan, Kyrgyzstan, and China. It has a land area of 142,326 km2 and a population of about 9.75 million people. The capital and largest city is Dushanbe. The ethnic majority is Tajiks, speaking a language closely related to Persian. Tajikistan's dialect is similar to Farsi and Dari of Iran and Afghanistan.

Turkmenistan: Turkmenistan is a landlocked country in Central Asia, bordered by Kazakhstan, Uzbekistan, Afghanistan, Iran, and the Caspian Sea. Ashgabat is the capital and largest city. With a population of 6.5 million, it is one of the six independent Turkic states and ranked as the 35th most-populous country in Asia. It has the lowest population among Central Asian republics and is one of the most sparsely populated nations in Asia.

Uzbekistan: Uzbekistan, officially the Republic of Uzbekistan, is a Central Asian country. It is doubly landlocked, surrounded by Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, and Turkmenistan. As part of the Turkic world, it is a member of the Organization of Turkic States. Uzbek is the primary language, with Russian widely spoken. The majority religion is Islam, specifically Sunni Islam.

Albania: Albania is a country in Southeast Europe, sharing borders with Montenegro, Kosovo, North Macedonia, and Greece. It is located on the Adriatic and Ionian Seas and displays diverse landscapes including mountains, lowland plains, and coastlines. The country's capital is Tirana, with other major cities being Durrës, Vlorë, and Shkodër.

Belarus: Belarus, officially the Republic of Belarus, is a landlocked country in Eastern Europe. It shares borders with Russia, Ukraine, Poland, Lithuania, and Latvia. With an area of 207,600 square kilometres and a population of 9.2 million, it is the 13th-largest country in Europe. Belarus has a hemiboreal climate and is divided into six regions. Minsk is the capital and largest city.

Bosnia and Herzegovina: Bosnia and Herzegovina, a country in Southeast Europe, shares borders with Serbia, Montenegro, and Croatia. It has a 20 km coast on the Adriatic Sea. The country's climate varies from continental with hot summers and cold winters to a Mediterranean climate in the southern region. Sarajevo is the capital and largest city.

Bulgaria: Bulgaria is a country in Southeast Europe, bordered by Greece, Turkey, Serbia, North Macedonia, and Romania. It covers 110,994 square kilometers and is the 16th largest country in Europe. Sofia is the capital and largest city, with other major cities being Burgas, Plovdiv, and Varna.

Croatia: Croatia, officially the Republic of Croatia, is a country in Central and Southeast Europe. It has a coastline along the Adriatic Sea and shares borders with Slovenia, Hungary, Serbia, Bosnia and Herzegovina, and Montenegro. The capital city is Zagreb, and other important cities include Split, Rijeka, and Osijek. In terms of geography, Croatia covers an area of 56,594 square kilometers. It has a population of approximately 3.9 million people.

Czech Republic: The Czech Republic, also called Czechia, is a landlocked country in Central Europe. It borders Austria, Germany, Poland, and Slovakia. It has a hilly landscape with a temperate climate. The capital is Prague, and other major cities include Brno, Ostrava, Plzeň, and Liberec.

Hungary: Hungary is a landlocked country in Central Europe, bordered by Slovakia, Ukraine, Romania, Serbia, Croatia, Slovenia, and Austria. It spans 93,030 square kilometres and has a population of 9.7 million. The official language is Hungarian, and Budapest is the capital and largest city. The majority of the population is ethnic Hungarian, with a significant Romani minority.

Kosovo: Kosovo is a landlocked country in Southeast Europe adjacent to Serbia, North Macedonia, Albania, and Montenegro. It has partial diplomatic recognition and is known for its vast plains, the Accursed and Šar Mountains, and its capital city, Pristina.

Moldova: Moldova, officially the Republic of Moldova, is a landlocked country in Eastern Europe. It covers an area of 33,483 km2 and has a population of around 2.5 million. Moldova is bordered by Romania and Ukraine. Transnistria, a breakaway state, is situated on its eastern border. Moldova is a unitary parliamentary representative democratic republic with its capital in Chișinău, the country's largest city and main cultural and commercial center.

Montenegro: Montenegro is a Southeast European country bordered by Bosnia and Herzegovina, Serbia, Kosovo, Albania, Croatia, and the Adriatic Sea. Its capital and largest city is Podgorica. Covering 10.4% of the country's territory, it has a population of around 621,000. Cetinje, the former royal capital, is a cultural hub with national institutions and the President's official residence.

North Macedonia: North Macedonia, officially the Republic of North Macedonia, is a landlocked country in Southeast Europe that shares borders with Kosovo, Serbia, Bulgaria, Greece, and Albania. Skopje is the capital and largest city, housing a quarter of the country's population of 1.83 million. The majority of the residents are ethnic Macedonians, while Albanians comprise a significant minority. Other ethnic groups include Turks, Roma, Serbs, Bosniaks, Aromanians, and a few other minorities.

Poland: Poland, officially known as the Republic of Poland, is a Central European country. It is made up of 16 administrative provinces called voivodeships and covers an area of 312,700 km2 (120,700 sq mi). With a population of over 38 million, Poland is the fifth most populous member state in the European Union. The country's capital and largest city is Warsaw, while other major cities include Kraków, Wrocław, and Gdańsk.

Romania: Romania is a European country located in Central and Southeast Europe. It shares borders with Ukraine, Hungary, Serbia, Bulgaria, and Moldova. The country has a continental climate and covers an area of about 238,400 square kilometres. With a population of around 19 million people, Romania is the twelfth-largest country in Europe and the sixth-most populous member of the EU. Bucharest is its capital, followed by Cluj-Napoca, Iași, Timișoara, Constanța, Craiova, Brașov, and Galați.

Russia: Russia, also known as the Russian Federation, is the world's largest country by area. It spans both Eastern Europe and Northern Asia, extending across eleven time zones. Russia shares land borders with fourteen countries and holds the title of Europe's most populous nation. Moscow serves as the capital and largest city, while Saint Petersburg is a prominent cultural center. Notable urban areas in Russia include Novosibirsk, Yekaterinburg, Nizhny Novgorod, Chelyabinsk, Krasnoyarsk, Kazan, Krasnodar, and Rostov-on-Don.

Serbia: Serbia is a landlocked country in Southeast and Central Europe, located in the Balkans and the Pannonian Plain. It shares borders with Hungary, Romania, Bulgaria, North Macedonia, Croatia, Bosnia and Herzegovina, and Montenegro. Serbia claims a border with Albania through the disputed territory of Kosovo. It has a population of about 6.6 million, excluding Kosovo, and its capital, Belgrade, is the largest city.

Slovakia: Slovakia, officially the Slovak Republic, is a landlocked country in Central Europe. It borders Poland, Ukraine, Hungary, Austria, and the Czech Republic. With a population of over 5.4 million, it spans about 49,000 square kilometres. Bratislava is the capital and largest city, while Košice is the second largest.

Slovenia: Slovenia, officially the Republic of Slovenia, is a small country in southern Central Europe. It is bordered by Italy, Austria, Hungary, and Croatia, with a short coastline in the Adriatic Sea. The country is mainly mountainous and covered in forests, with a total area of 20,271 square kilometres and a population of 2.1 million. The majority of its residents are Slovenes, and the official language is Slovene. Slovenia has a diverse climate, with a mix of temperate continental, sub-mediterranean, and alpine climates. The capital city, Ljubljana, is located near the country's center.

Ukraine: Ukraine is a large country in Eastern Europe, bordered by Russia, Belarus, Poland, Slovakia, Hungary, Romania, and Moldova. It has a coastline along the Black Sea and the Sea of Azov. Kyiv is its capital and largest city, followed by Kharkiv, Dnipro, and Odesa. The official language is Ukrainian, but Russian is widely spoken in the east and south.

Andorra: Andorra, officially the Principality of Andorra, is a landlocked country in the eastern Pyrenees. It is bordered by France to the north and Spain to the south. Andorra was created by Charlemagne and later ruled by the count of Urgell before being transferred to the Roman Catholic Diocese of Urgell. The present principality was formed in 1278 and is currently headed by two co-princes: the bishop of Urgell and the president of France. The capital and largest city is Andorra la Vella.

Austria: Austria, a landlocked country in Central Europe, is a federation of nine federal states. Its capital city, Vienna, is the most populous and serves as a federal state. Surrounded by Germany, Czech Republic, Slovakia, Hungary, Slovenia, Italy, Switzerland, and Liechtenstein, Austria occupies an area of 83,879 km2 (32,386 sq mi) with a population of around 9 million.

Belgium: Belgium is a country in Northwestern Europe, bordered by the Netherlands, Germany, Luxembourg, France, and the North Sea. It has an area of 30,689 km2 and a population of over 11.5 million. Belgium is known for being densely populated, ranking 22nd worldwide and 6th in Europe. Brussels is the capital and largest city, along with other major cities such as Antwerp, Ghent, and Bruges. Belgium is historically part of the Low Countries and is known for its rich cultural heritage.

France: France is a country in Western Europe with territories in the Americas and oceans. It borders Belgium, Luxembourg, Germany, Switzerland, Italy, Monaco, Andorra, Spain, and the UK. Its metropolitan area spans from the Rhine to the Atlantic and the Mediterranean to the English Channel. It has overseas territories in South America, the North Atlantic, the West Indies, Oceania, and the Indian Ocean. France has 18 integral regions, covering a total area of 643,801 km2, with a population of over 68 million. It is a unitary semi-presidential republic, with Paris as its capital and major cities like Marseille, Lyon, and Toulouse.

Germany: Germany is a populous country in Central Europe, bordered by various countries. It is the second-most populous country in Europe and a member state of the European Union. Germany has 16 constituent states, with a total population of over 84 million. It is known for its location between the Baltic and North Sea in the north and the Alps in the south. The capital city is Berlin, the main financial center is Frankfurt, and the largest urban area is the Ruhr.

Republic of Ireland: The Republic of Ireland is a country in north-western Europe, consisting of 26 out of the 32 counties of Ireland. Dublin is the capital and largest city. The country shares a land border with Northern Ireland, part of the United Kingdom, and is surrounded by the Atlantic Ocean. It has a population of 5.15 million, with 2.1 million residing in the Greater Dublin Area. The government is a unitary parliamentary republic, with the Oireachtas as the legislature and a President serving as the head of state. The Taoiseach is the head of government, appointed by the President.

Liechtenstein: Liechtenstein is a small German-speaking microstate in the Alps, squeezed between Austria and Switzerland. Despite its tiny size, Liechtenstein is internationally recognized as the sixth smallest nation. It operates as a semi-constitutional monarchy, led by the ruling prince of Liechtenstein.

Luxembourg: Luxembourg, a small landlocked country in Western Europe, is known for being one of the four institutional seats of the European Union. It shares its borders with Belgium, Germany, and France. The capital city, Luxembourg, hosts several EU institutions, including the Court of Justice of the European Union. The country's language and culture are influenced by its French and German neighbors, with Luxembourgish being the national language. French is used for legislation and all three languages are used for administrative matters.

Monaco: Monaco is a sovereign city-state and microstate located in Western Europe on the French Riviera. It borders France and is known for being one of the wealthiest places in the world. The principality has a population of 38,682 people, with a majority being Monégasque nationals. The official language is French, but many residents also speak Monégasque, English, and Italian.

Netherlands: The Netherlands, also known as Holland, is a country in Northwestern Europe with territories in the Caribbean. It is the largest part of the Kingdom of the Netherlands and consists of twelve provinces. It shares borders with Germany and Belgium and has a North Sea coastline. The official language is Dutch, with West Frisian as a secondary official language in one province. The Netherlands has overseas territories and shares maritime borders with the United Kingdom, Germany, and Belgium.

Switzerland: Switzerland is a landlocked country in Europe, bordered by Italy, France, Germany, Austria, and Liechtenstein. It is geographically divided into the Swiss Plateau, the Alps, and the Jura. The Alps dominate the landscape, while most of the population resides in cities like Zürich, Geneva, and Basel on the Swiss Plateau.

United Kingdom: The United Kingdom (UK) or Britain is a country in Northwestern Europe. It consists of England, Scotland, Wales, and Northern Ireland. The UK includes the island of Great Britain, part of Ireland, and other smaller islands. It shares a land border with the Republic of Ireland and is surrounded by the Atlantic Ocean and other seas. The UK covers an area of 94,060 square miles (243,610 km2) and has a population of around 67 million people (2022 estimate).

Denmark: Denmark, a Nordic country in Northern Europe, is the most populous part of the Kingdom of Denmark. It is located south-west of Sweden, south of Norway, and shares a short border with Germany. Denmark includes the autonomous territories of the Faroe Islands and Greenland in the North Atlantic Ocean.

Estonia: Estonia is a country in Europe, located by the Baltic Sea. It shares borders with Finland, Latvia, and Russia. The country is made up of a mainland, two large islands, and numerous smaller islands. It covers an area of 45,339 square kilometers. Tallinn and Tartu are major cities in Estonia. The official and indigenous language is Estonian, widely spoken in the country and the second-most spoken Finnic language in the world.

Finland: Finland is a Nordic country in Northern Europe that shares borders with Sweden, Norway, and Russia. It has a population of 5.6 million, predominantly ethnic Finns. The official languages are Finnish and Swedish. The capital and largest city is Helsinki. Finland has a varied climate, ranging from humid continental in the south to boreal in the north. The country is covered with boreal forest biome and boasts over 180,000 lakes.

Iceland: Iceland is a Nordic island nation located between the North Atlantic and Arctic Oceans. It is culturally and politically connected to Europe. Reykjavík, its capital, is home to about 36% of the population. With approximately 380,000 residents, it is Europe's least densely populated country. Icelandic is the official language.

Latvia: Latvia, a country in Northern Europe, is one of the three Baltic states. It shares borders with Russia and Belarus and has a maritime border with Sweden. With an area of 64,589 km2 and a population of 1.9 million, Latvia has a temperate climate. Riga is the capital and largest city. Latvians speak Latvian, a surviving Baltic language, and form the ethnic majority. Russians make up a significant minority, accounting for almost a quarter of the population.

Lithuania: Lithuania is a country in the Baltic region of Europe, bordered by Latvia, Belarus, Poland, and Russia. It has a population of 2.86 million and covers an area of 65,300 km2. Vilnius is its capital and largest city. Lithuanians speak Lithuanian, one of the few living Baltic languages.

Norway: Norway is a Nordic country in Northern Europe, located on the Scandinavian Peninsula. It includes the remote Arctic island of Jan Mayen, the archipelago of Svalbard, and claims territories in Antarctica. The capital and largest city is Oslo.

Sweden: Sweden, known officially as the Kingdom of Sweden, is a Nordic country situated on the Scandinavian Peninsula in Northern Europe. It shares borders with Norway and Finland, while also being connected to Denmark via the Öresund bridge-tunnel.

Greece: Greece, officially known as the Hellenic Republic, is a Southeast European country situated in the southern region of the Balkan peninsula. It shares borders with Albania, North Macedonia, Bulgaria, and Turkey. With an extensive coastline, Greece boasts the longest stretch in the Mediterranean Basin, featuring numerous islands. The nation has a population of approximately 10.5 million and is home to major cities like Athens, the capital, as well as Thessaloniki and Patras.

Italy: Italy, officially known as the Italian Republic, is a country located in Southern and Western Europe. It is a peninsula surrounded by the Mediterranean Sea and has land borders with France, Switzerland, Austria, Slovenia, Vatican City, and San Marino. Italy has a diverse geography, including an exclave in Switzerland and an archipelago in Africa. With an area of 301,340 km2 and a population of around 60 million, it is the tenth-largest country in Europe and the third-most populous member state of the European Union. Rome serves as the capital and largest city of Italy.

Malta: Malta is a Southern European island country situated in the Mediterranean Sea. It is an archipelago located between Italy and Libya, with its capital being Valletta. The official languages spoken are Maltese and English.

Portugal: Portugal, officially known as the Portuguese Republic, is a country in Southwestern Europe. It is located on the Iberian Peninsula and includes the Azores and Madeira islands. The country has the westernmost point in continental Europe and shares its borders with Spain. Lisbon is the capital city and a major tourist destination, along with Porto and Algarve. The mainland features the largest region, Alentejo, with low population density.

San Marino: San Marino, officially the Republic of San Marino, is a European microstate enclosed by Italy. It is the fifth-smallest country globally, covering only 61 km2. Situated northeast of the Apennine Mountains, it has a population of around 33,660 as of 2022.

Spain: Spain, located in Southwestern Europe, is the largest country in Southern Europe and a member of the European Union. Its territory spans across the Iberian Peninsula and includes the Canary Islands, Balearic Islands, and the autonomous cities of Ceuta and Melilla. Bordered by France, Andorra, the Mediterranean Sea, Gibraltar, Portugal, and the Atlantic Ocean, Spain's capital is Madrid with other major urban areas including Barcelona, Valencia, and Seville.

Vatican City: Vatican City is an independent country and enclave within Rome, Italy. It gained independence in 1929 and is owned and governed by the Holy See. With an area of 49 hectares and a population of around 764, it is the world's smallest state. The Pope, as the head of the Catholic Church, rules Vatican City, and the highest state officials are Catholic clergy. The Vatican is synonymous with the Holy See and serves as the residence of the popes.

Australia: Australia, officially called the Commonwealth of Australia, is a large country in Oceania. It is the world's sixth-largest nation, encompassing the mainland, Tasmania, and several smaller islands. Australia is known for its diverse landscapes and climates, including deserts, rainforests, savannas, and mountains. It is the oldest, flattest, and driest inhabited landmass, with unproductive soils. This megadiverse country offers a variety of environments and is home to unique flora and fauna.

Fiji: Fiji, officially the Republic of Fiji, is an island country located in Melanesia, part of Oceania in the South Pacific Ocean. It consists of over 330 islands with about 110 inhabited and more than 500 islets. With a total land area of around 18,300 square kilometers, the most distant island group is Ono-i-Lau. Viti Levu and Vanua Levu are the two main islands where about 87% of the population resides. The majority of Fijians live along the coasts of Viti Levu, particularly in the capital city of Suva and other urban centers like Nadi and Lautoka. The inland areas of Viti Levu have low population density due to challenging terrain.

Papua New Guinea: Papua New Guinea is an island country in Oceania, located in Melanesia. It shares a border with Indonesia and is near Australia and the Solomon Islands. The capital is Port Moresby. With an area of 462,840 km2 (178,700 sq mi), it is the third largest island country globally.

Solomon Islands: The Solomon Islands is a country in Oceania, northeast of Australia. It consists of six major islands and over 900 smaller islands. It shares borders with Papua New Guinea, Australia, New Caledonia, Vanuatu, Fiji, Wallis and Futuna, Tuvalu, Nauru, and the Federated States of Micronesia. The country has a total area of 30,407 square kilometers and a population of 734,887. Its capital is Honiara, located on the largest island, Guadalcanal. The Solomon Islands take their name from a collection of Melanesian islands, which also includes the Autonomous Region of Bougainville but excludes the Santa Cruz Islands.

Vanuatu: Vanuatu is an island country in Melanesia, located in the South Pacific Ocean. It is an archipelago of volcanic origin, situated 1,750 km east of northern Australia and 540 km northeast of New Caledonia. The country is surrounded by the Solomon Islands to the southeast and Fiji to the west.

Federated States of Micronesia: Micronesia is an island country in the western Pacific, northeast of Indonesia. It is made up of four states, Yap, Chuuk, Pohnpei, and Kosrae, which together consist of around 607 islands. The country is located just north of the equator and lies south of Guam and the Marianas. It is 2,700 km long and is positioned west of Nauru and the Marshall Islands. Micronesia is also located east of Palau and the Philippines, around 2,900 km north of eastern Australia, and 3,400 km southeast of Japan.

Kiribati: Kiribati, officially the Republic of Kiribati, is an island country in Micronesia, located in the central Pacific Ocean. With a population of over 119,000, most of the people reside on the Tarawa atoll. Kiribati consists of 32 atolls and one remote raised coral island, Banaba. The country has a total land area of 811 km2 dispersed over 3,441,810 km2 of ocean.

Marshall Islands: The Marshall Islands is an island country in the Pacific Ocean, consisting of 29 coral atolls and five islands. It is located west of the International Date Line and north of the equator. The country is divided into two island chains: Ratak in the east and Ralik in the west. With 97.87% of its territory being water, it has the highest proportion of water to land among sovereign states. The Marshall Islands shares maritime boundaries with Wake Island, Kiribati, Nauru, and the Federated States of Micronesia. Majuro is the capital and largest city, housing about half of the country's population.

Nauru: Nauru, officially the Republic of Nauru, is a small island country and microstate in Micronesia, part of Oceania in the Central Pacific. Formerly known as Pleasant Island, Nauru is the third-smallest country in the world, with an area of only 21 km2. It is larger than Vatican City and Monaco but smaller than most other nations. With a population of about 10,800, Nauru is also one of the world's smallest countries in terms of population. It is located northwest of Tuvalu and northeast of the Solomon Islands, with its nearest neighbor being Banaba of Kiribati. Nauru is recognized as the smallest republic and island nation globally.

Palau: Palau, officially known as the Republic of Palau, is an island country in Oceania. It comprises around 340 islands, connecting the western chain of the Caroline Islands with parts of the Federated States of Micronesia. With a total area of 466 square kilometers (180 sq mi), it is one of the smallest countries globally. The most populous island is Koror, housing the capital city, Ngerulmud, located on the larger island of Babeldaob in Melekeok State. Palau shares maritime boundaries with international waters to the north, the Federated States of Micronesia to the east, Indonesia to the south, and the Philippines to the northwest.

New Zealand: New Zealand, an island country in the southwestern Pacific Ocean, consists of two main landmasses—the North Island and the South Island—and over 700 smaller islands. It is the sixth-largest island country by area and is situated east of Australia across the Tasman Sea. The country's diverse topography and stunning mountain peaks, such as the Southern Alps, are a result of tectonic uplift and volcanic activity. Wellington serves as the capital city of New Zealand, and Auckland is its most populous city.

Samoa: Samoa, formerly Western Samoa, is a Polynesian island country located 64 km west of American Samoa. It consists of two main islands, two smaller inhabited islands, and several uninhabited islands. The capital and largest city is Apia. The Samoan Islands were settled by the Lapita people around 3,500 years ago, leading to the development of the Samoan language and cultural identity.

Tonga: Tonga, officially known as the Kingdom of Tonga, is an island nation in Polynesia, part of Oceania. It consists of 171 islands, with 45 of them inhabited, covering a total surface area of 750 km2 (290 sq mi) across 700,000 km2 (270,000 sq mi) in the Pacific Ocean. With a population of 104,494, the majority of Tongans live on the main island of Tongatapu. It is bordered by Fiji and Wallis and Futuna to the northwest, Samoa to the northeast, New Caledonia and Vanuatu to the west, Niue to the east, and Kermadec to the southwest, while being about 1,800 km (1,100 mi) away from New Zealand's North Island. Tonga is also a member of The Commonwealth.

Tuvalu: Tuvalu, also known as the Ellice Islands, is a small island country in the Pacific Ocean, located between Hawaii and Australia. It is situated in the Polynesian subregion of Oceania and is surrounded by several other Pacific Island countries.

Abkhazia: Abkhazia is a partially recognised state in the South Caucasus, located on the Black Sea coast. It spans 8,665 square kilometres and has a population of around 245,000. Sukhumi serves as its capital and largest city.

Cook Islands: The Cook Islands is a self-governing island country in the South Pacific Ocean, associated with New Zealand. It consists of 15 islands with a land area of 236.7 square kilometres. The Cook Islands have a vast Exclusive Economic Zone covering 1,960,027 square kilometres of ocean.

Nagorno-Karabakh: Nagorno-Karabakh is a mountainous region in southeastern Azerbaijan, situated between Lower Karabakh and Syunik. It comprises mostly mountains and forests.

Niue: Niue is a self-governing island country in the South Pacific Ocean, associated with New Zealand. It is part of Polynesia and predominantly inhabited by Polynesians. Known as "The Rock," it derives its name from its traditional moniker, "Rock of Polynesia."

Northern Cyprus: Northern Cyprus, officially known as the Turkish Republic of Northern Cyprus, is a de facto state located in the northeastern part of Cyprus. It is recognized solely by Turkey and is considered by the international community to be a part of the Republic of Cyprus.

State of Palestine: Palestine, officially known as the State of Palestine, is a state in West Asia governed by the Palestine Liberation Organization. It claims the West Bank and Gaza Strip as its territory, which have been occupied by Israel since 1967. The West Bank has partial Palestinian rule, while Israeli settlements and control dominate the region. The Gaza Strip was controlled by Egypt until captured by Israel in 1967. Israel withdrew in 2005, and Hamas seized power after the 2006 elections. Subsequently, the Gaza Strip has been blockaded by Israel and Egypt.

Somaliland: Somaliland is an unrecognized state in the Horn of Africa, regarded as part of Somalia by the international community. It is located on the Gulf of Aden and shares borders with Djibouti, Ethiopia, and Somalia. Somaliland claims an area of 176,120 square kilometers and has a population of approximately 5.7 million. The capital city is Hargeisa. The government sees Somaliland as the successor to British Somaliland, which united with the Trust Territory of Somaliland to form the Somali Republic from 1960 to 1991.

South Ossetia: South Ossetia, also known as the Republic of South Ossetia or the State of Alania, is a landlocked state in the South Caucasus. It has a population of approximately 56,500 people, with the capital city, Tskhinvali, being home to 33,000 residents. Occupying an area of 3,900 sq km, South Ossetia is only partially recognized.

Taiwan: Taiwan, officially known as the Republic of China (ROC), is a country in East Asia, located in the northwestern Pacific Ocean. It shares borders with the People's Republic of China, Japan, and the Philippines. The ROC controls 168 islands with a combined area of 36,193 square kilometres. Taiwan's main island, also called Formosa, is dominated by mountain ranges in the east and has heavily populated plains in the west. The capital city of Taipei, along with New Taipei City and Keelung, forms the largest metropolitan area in Taiwan. The country has a high population density, with around 23.9 million inhabitants.

Transnistria: Transnistria or Pridnestrovie is an internationally unrecognized state in Moldova, controlling land along the Dniester river and the border with Ukraine. Its capital is Tiraspol. It is recognized by only two other breakaway states. Moldova refers to it as the Administrative-Territorial Units of the Left Bank of the Dniester or Stînga Nistrului. In March 2022, the Council of Europe declared it as being under Russia's military occupation.

Western Sahara: Western Sahara is a disputed territory in northwest Africa. 20% is controlled by the Sahrawi Arab Democratic Republic while Morocco occupies the remaining 80%. Covering 266,000 sq km, it is sparsely populated with just over 500,000 people, mostly in the city of Laayoune. It is known for its desert flatlands.

Holy See: The Holy See, also known as the See of Rome or the Apostolic See, is the jurisdiction of the Pope as the bishop of Rome. It is the central governing body of the Catholic Church and has sovereignty over the Vatican City. As a sovereign entity, it holds power over the worldwide Catholic Church and is recognized under international law.

Central Africa: Central Africa is a region in Africa made up of various countries, including Angola, Burundi, Cameroon, Central African Republic, Chad, Democratic Republic of the Congo, Republic of the Congo, Equatorial Guinea, Gabon, Rwanda, and São Tomé and Príncipe. It is referred to as Middle Africa by the United Nations. These countries are part of the Economic Community of Central African States (ECCAS), and some also share a common currency called the Central African CFA franc through the Economic and Monetary Community of Central Africa (CEMAC).

East Africa: East Africa is the eastern subregion of the African continent and is made up of 10-11-(16*) territories, according to the United Nations Statistics Division. It is often referred to as Eastern Africa or East of Africa.

North Africa: North Africa is a region spanning from Western Sahara's Atlantic shores to Egypt and Sudan's Red Sea coast. It constitutes the northern part of Africa, with varying definitions for its exact boundaries.

Southern Africa: Southern Africa is the southernmost region of the African continent. It encompasses various definitions, including those provided by the United Nations, Southern African Development Community, and physical geography.

Sub-Saharan Africa: Sub-Saharan Africa refers to the region in Africa that lies south of the Sahara Desert. It includes Central, East, Southern, and West Africa. This geographical area is not standardized, with the number of countries included ranging from 46 to 48. The African Union recognizes all 55 member states on the continent, grouping them into five standardized regions.

West Africa: West Africa is the westernmost region of Africa, consisting of 16 countries and three overseas territories. It has a population of approximately 419 million people and is one of the fastest-growing regions in Africa.

Puntland: Puntland is an autonomous state in northeastern Somalia, with Garoowe as its capital city. It was declared independent in 1998. Puntland claims territories to the west that were not colonized by Europeans during the Scramble for Africa.

Central Asia: Central Asia is a region in Asia extending from the Caspian Sea and Eastern Europe to Western China and Mongolia. It encompasses Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan, which are collectively known as the "-stans" due to their names ending in "-stan," meaning "land of." This region also includes Afghanistan, Iran, and parts of Russia.

Greater Khorasan: Greater Khorasan, in the Iranian Plateau, is a historic eastern region bridging Western and Central Asia.

East Asia: East Asia refers to a region in Asia consisting of China, Mongolia, Japan, North Korea, South Korea, and Taiwan. It also includes the autonomous regions of Hong Kong and Macau. The economies of these countries are among the world's largest and most prosperous. East Asia shares borders with Siberia and Russian Far East in the north, Southeast Asia in the south, South Asia in the southwest, and Central Asia in the west. The Pacific Ocean lies to the east, while Micronesia is to the southeast.

Middle East: The Middle East refers to a geopolitical region, replacing the term Near East in the 20th century. It includes the Arabian Peninsula, Levant, Turkey, Egypt, Iran, and Iraq. The term has caused confusion and is seen as Eurocentric. It encompasses most of West Asia, excluding the South Caucasus, and includes all of Egypt and Turkey.

Eastern Arabia: Eastern Arabia refers to a region along the Persian Gulf coast, spanning from Basra in Iraq to Khasab in Oman. It includes modern-day Bahrain, Kuwait, parts of Iraq, Saudi Arabia, the UAE, Qatar, and Oman. This coastal strip was known as "Bahrain" for a thousand years.

Kurdistan: Kurdistan refers to a region in West Asia where Kurds are the majority population and have a strong cultural and national identity. It includes the northwestern Zagros and eastern Taurus mountain ranges.

Levant: The Levant is a historical term referring to a large area in the Eastern Mediterranean region of West Asia. It represents the land bridge between Africa and Eurasia. In its narrowest sense, it includes Cyprus and a stretch of land bordering the Mediterranean Sea, such as present-day Israel, Jordan, Lebanon, Syria, the Palestinian territories, and parts of Turkey. In its widest sense, it includes all countries along the Eastern Mediterranean shores from Greece to Eastern Libya.

South Asia: South Asia is the southern region of Asia, comprising Afghanistan, Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan, and Sri Lanka. It borders East Asia, Central Asia, West Asia, and Southeast Asia. The region is defined by the Indian subcontinent and is marked by the Indian Ocean to the south and the Himalayas, Karakoram, and Pamir Mountains to the north.

Kashmir: Kashmir is a region in the northernmost part of the Indian subcontinent. Historically, it referred to only the Kashmir Valley. However, today it includes the territories of Jammu and Kashmir and Ladakh in India, Azad Kashmir and Gilgit-Baltistan in Pakistan, and Aksai Chin and the Trans-Karakoram Tract in China.

Punjab: Punjab is a significant geopolitical and cultural region in South Asia, located in the northwestern part of the Indian subcontinent. It encompasses areas of modern-day eastern Pakistan and northwestern India. Major cities in Punjab include Lahore, Faisalabad, Rawalpindi, Gujranwala, Multan, Ludhiana, Amritsar, Sialkot, Chandigarh, Shimla, Jalandhar, Patiala, Gurugram, and Bahawalpur.

Southeast Asia: Southeast Asia is a region in Asia located south of China, east of the Indian subcontinent, and northwest of mainland Australia. It is bordered by East Asia to the north, South Asia and the Bay of Bengal to the west, Oceania and the Pacific Ocean to the east, and Australia and the Indian Ocean to the south. Maritime Southeast Asia lies partly within the Southern Hemisphere, while mainland Southeast Asia is entirely in the Northern Hemisphere.

Caucasus: The Caucasus, also known as Caucasia, is a region located between the Black Sea and the Caspian Sea. It includes Armenia, Azerbaijan, Georgia, and parts of Southern Russia. The Caucasus Mountains, particularly the Greater Caucasus range, have historically served as a natural boundary between Eastern Europe and West Asia.

Hebei: Hebei is a northern province in China, with a population of over 75 million people. Its capital city is Shijiazhuang. The province is primarily inhabited by Han Chinese and also has small populations of Manchu, Hui, and Mongol ethnicities. The main dialects spoken in Hebei are Jilu Mandarin, Beijing Mandarin, and Jin.

Inner Mongolia: Inner Mongolia, officially known as Inner Mongolia Autonomous Region, is an autonomous region of China. It shares borders with both Mongolia and Russia. Hohhot is its capital city, while Baotou, Chifeng, Tongliao, and Ordos are other major cities within the region.

Fujian: Fujian is a coastal province in southeastern China, bordered by Zhejiang, Jiangxi, Guangdong, and the Taiwan Strait. Its capital is Fuzhou, while its largest city is Quanzhou. Notable cities include Xiamen and Zhangzhou. Fujian is geographically and culturally close to Taiwan, with certain islands like Kinmen located just east of Xiamen.

Jiangsu: Jiangsu is a highly developed coastal province in eastern China, known for its strong financial, educational, technological, and tourist industries. The province is the most densely populated and has the highest GDP per capita in the country. It borders Shandong, Anhui, Zhejiang, and Shanghai, and boasts a coastline of over 1,000 kilometers along the Yellow Sea. The Yangtze River flows through its southern region.

Shandong: Shandong: coastal province of China, part of East China region.

Henan: Henan is a landlocked province in central China, known as the birthplace of Han Chinese civilization. With a history spanning over 3,200 years, it was China's cultural, economic, and political center until about 1,000 years ago. The province is often referred to as Zhongyuan or Zhongzhou, meaning "central plain" or "midland."

Hubei: Hubei is a landlocked province in central China, known for its capital Wuhan, which serves as a major transportation hub and the political, cultural, and economic center of the region. The province's name derives from its location to the north of Dongting Lake.

Hunan: Hunan is a landlocked province located in central China, bordered by Hubei, Jiangxi, Guangdong, Guangxi, Guizhou, and Chongqing. Its capital and largest city is Changsha, situated along the Xiang River. With a population of over 66 million, it is the 7th most populous province in China and the most populous in Central China. Hunan is the largest province in South-Central China and covers an area of approximately 210,000 km2.

Guangdong: Guangdong, also known as Canton or Kwangtung, is a coastal province in southern China. It has a population of over 126 million, making it the most populous province in China and the second-most populous in the world. Guangdong covers an area of about 179,800 square kilometers and is located on the north shore of the South China Sea. Its capital is Guangzhou.

Guangxi: Guangxi is an autonomous region in China's South China, bordered by Vietnam and the Gulf of Tonkin. It became an autonomous region in 1958 after previously being a province. The region's capital is Nanning.

Manchuria: Manchuria refers to a region in Northeast Asia, specifically Northeast China including the provinces of Heilongjiang, Jilin, and Liaoning, as well as parts of the Russian Far East. It was historically the homeland of the Jurchens and later the Manchus. It was under the control of Qing China until parts of it were ceded to the Russian Empire in the 19th century. These ceded areas are known as Outer Manchuria or Russian Manchuria. The region also includes the eastern Inner Mongolian prefectures of Hulunbuir, Hinggan, Tongliao, and Chifeng, collectively known as Northeast China.

Xinjiang: Xinjiang is an autonomous region of China, situated in northwest China at the intersection of Central Asia and East Asia. With an area of 1.6 million square kilometers and a population of 25 million, it is the largest province-level division in China. Xinjiang shares borders with Mongolia, Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, Pakistan, and India. It is defined by its rugged mountain ranges, including Karakoram, Kunlun, and Tian Shan. The region also encompasses the Aksai Chin and Trans-Karakoram Tract, which are disputed territories claimed by India. Xinjiang is a crucial part of the historic Silk Road.

Sichuan: Sichuan is a province in Southwest China, known for its location in the Sichuan Basin and the Tibetan Plateau. Chengdu serves as its capital city, with a population of 83 million. Sichuan shares borders with many provinces, including Qinghai, Gansu, Shaanxi, Chongqing, Guizhou, Yunnan, and Tibet Autonomous Region.

Tibet: Tibet is a region in East Asia, known for its vast Tibetan Plateau. It covers about 2.5 million square kilometers and is home to the Tibetan people, along with other ethnic groups. Since 1951, Tibet has been under the administration of the People's Republic of China, divided into the Tibet Autonomous Region and parts of Qinghai and Sichuan provinces. The Republic of China also claims Tibet constitutionally since 1912.

Yunnan: Yunnan is a province in southwestern China, bordering Guizhou, Sichuan, Guangxi, Tibet, Vietnam, Laos, and Myanmar. It covers 394,000 km2 (152,000 sq mi) with a population of 48.3 million. The capital city is Kunming. Yunnan is known as the fourth least developed province in China based on disposable income per capita in 2014.

Andhra Pradesh: Andhra Pradesh is a state in southern India with a 162,970 km2 area and a population of 49,577,103. It shares borders with Chhattisgarh, Odisha, Karnataka, Tamil Nadu, Telangana, and the Bay of Bengal. It has the second-longest coastline in India at 974 km. It became its present form on 2 June 2014, after the formation of Telangana. Amaravati is the capital, and Visakhapatnam is the largest city. Water disputes and asset division with Telangana remain unresolved. Telugu is the first official language.

Bihar: Bihar is an eastern state in India, known for being the third largest in population and the 12th largest in area. With a significant GDP ranking, Bihar shares borders with Uttar Pradesh, Nepal, West Bengal, and Jharkhand. The state is divided by the Ganges river, which flows from west to east.

Gujarat: Gujarat is a state in western India known for its long coastline and the Kathiawar peninsula. It is the fifth-largest Indian state by area and has a population of 60.4 million. Bordering Rajasthan, Dadra and Nagar Haveli, Daman and Diu, Maharashtra, Madhya Pradesh, Arabian Sea, and Sindh province of Pakistan, Gujarat's capital is Gandhinagar and its largest city is Ahmedabad. Gujarati is the state's official language, spoken by the indigenous Gujaratis.

Maharashtra: Maharashtra is a state in western India on the Deccan Plateau, bordered by the Arabian Sea, Karnataka, Goa, Telangana, Chhattisgarh, Gujarat, Madhya Pradesh, and Dadra and Nagar Haveli and Daman and Diu. It is the second-most populous state in India and known for its significant population and geographical location.

Northeast India: Northeast India, also called North Eastern Region (NER), is the easternmost division of India. It consists of eight states known as the "Seven Sisters" (Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, and Tripura) along with Sikkim. Geographically and politically distinct, this region is known for its rich cultural diversity and scenic beauty.

Rajasthan: Rajasthan, in northern India, is the largest state by area and seventh largest by population. It covers 342,239 sq km (10.4% of India's land) and is known for the vast Thar Desert. It shares borders with Pakistan's Punjab and Sindh provinces and is surrounded by five other Indian states. With a geographic location between 23°.3' to 30°.12' North latitude and 69°.30' to 78°.17' East longitude, Rajasthan's southernmost tip lies on the Tropic of Cancer.

Tamil Nadu: Tamil Nadu is India's southernmost state, known for being the home of the Tamil people who speak the enduring Tamil language. It is the tenth largest state in India and has the sixth largest population. The capital and largest city of Tamil Nadu is Chennai.

Uttar Pradesh: Uttar Pradesh, a state in northern India, is the most populous and has a population of over 241 million. It was established in 1950 as a successor to the United Provinces. The state has Lucknow as its capital and is divided into 18 divisions and 75 districts. It is known for the Triveni Sangam, where the Ganges and Yamuna rivers meet, and for rivers like Gomti and Saryu. The state has 6.1% forest cover, with 82% of its geographical area being cultivable.

West Bengal: West Bengal is a state in eastern India known for its population of over 91 million people. Situated along the Bay of Bengal, it is the fourth-most populous state in India and the eighth-most populous country subdivision in the world. It shares borders with Bangladesh, Nepal, Bhutan, and several Indian states. The state capital is Kolkata, a major city in the region. West Bengal includes diverse geographical features such as the Darjeeling Himalayan hill region, the Ganges delta, and the Sundarbans. The majority of the population is made up of Bengalis, with Bengali Hindus being the dominant group.

Aceh: Aceh is the westernmost province of Indonesia, located on the northern end of Sumatra island. Its capital and largest city is Banda Aceh. It is bordered by the Indian Ocean and the Strait of Malacca, and shares maritime borders with Malaysia, Thailand, the Maldives, the British Indian Ocean Territory, Sri Lanka, the Andaman and Nicobar Islands, and Myanmar. Aceh has a special autonomous status and is known for practicing Sharia law. It is home to ten indigenous ethnic groups, with the Acehnese people being the largest group, accounting for 70% of the population.

Papua (province): Papua is an Indonesian province located on the northern coast of Western New Guinea and islands in Cenderawasih Bay. It shares borders with Papua New Guinea, the Pacific Ocean, and other Indonesian provinces. After the splitting of regencies in 2022, it now consists of eight regencies and one city, Jayapura. The province possesses abundant natural resources including gold, nickel, and petroleum. Papua, along with other Papuan provinces, enjoys a higher level of autonomy within Indonesia.

Penang: Penang is a Malaysian state situated on the northwest coast of Peninsular Malaysia, along the Malacca Strait. It comprises Penang Island, home to the capital city George Town, and Seberang Perai on the Malay Peninsula. The state is connected by two bridges, the Penang Bridge and the Second Penang Bridge, and shares borders with Kedah to the north and east, as well as Perak to the south.

Balochistan, Pakistan: Balochistan, Pakistan is the country's largest province in terms of land area, despite being the least populated. It is located in the southwestern region, sharing borders with Khyber Pakhtunkhwa, Punjab, and Sindh provinces of Pakistan. It also has international borders with Iran and Afghanistan, while being bound by the Arabian Sea. Balochistan is known for its rough terrain, featuring extensive plateaus and ranges. Notably, it is home to the world's largest deep sea port, the Port of Gwadar, situated along the Arabian Sea.

Sindh: Sindh is a Pakistani province located in the southeast. It is the third-largest by land area and the second-largest by population. It borders Balochistan and Punjab provinces, while sharing borders with Indian states. Sindh's landscape encompasses alluvial plains along the Indus River, the Thar Desert, and the Kirthar Mountains.

Hejaz: Hejaz is a region in western Saudi Arabia, encompassing major cities like Mecca, Medina, Jeddah, Tabuk, Yanbu, Taif, and Baljurashi. It is known as the "Western Province" and bordered by the Red Sea, Jordan, Najd, and the Region of 'Asir. Jeddah is its largest city, followed by Mecca and Medina.

Eastern Europe: Eastern Europe is a diverse subregion of Europe with varying boundaries and connotations. It generally includes countries like Belarus, Russia, Ukraine, Moldova, and Romania. Some definitions may also include the Visegrád group, Baltic states, Balkans, and Caucasus. The Ural Mountains mark its eastern boundary. Eastern Europe is characterized by its geopolitical, cultural, ethnic, and socio-economic diversity.

Western Europe: Western Europe refers to the western region of the European continent, with its extent varying in different contexts.

Vojvodina: Vojvodina is an autonomous province in Serbia, located in Central Europe. It occupies the northernmost part of the country and lies within the Pannonian Basin. Its administrative center is Novi Sad, the second-largest city in Serbia, which is bordered to the south by Belgrade and the Sava and Danube Rivers.

Flanders: Flanders is the Dutch-speaking part of Belgium with diverse definitions related to language, culture, politics, and history. The region's capital is Brussels, though it has its own government. The demonym is Fleming, and Flemish refers to the Dutch dialects spoken in the area. Flanders exercises economic control in the Flemish Region and oversees aspects of Flemish life in Brussels, including culture and education.

Wallonia: Wallonia is the French-speaking region in the southern part of Belgium, covering 55% of its territory but with only a third of its population. It is one of the three regions in Belgium, along with Flanders and Brussels. The Walloon Region and the French Community of Belgium are separate concepts, with the latter including both Wallonia and the bilingual Brussels-Capital Region.

Brittany: Brittany is a historical area in northwest France, once a kingdom and later a duchy, that became part of France in 1532 while retaining some autonomy.

Provence: Provence is a historical province and geographical region in southeastern France. It stretches from the lower Rhône River to the Italian border, with the Mediterranean Sea to the south. It corresponds with the administrative region of Provence-Alpes-Côte d'Azur and includes Var, Bouches-du-Rhône, Alpes-de-Haute-Provence, and parts of Alpes-Maritimes and Vaucluse. Marseille is the largest city and capital of this region.

Bavaria: Bavaria is a state in southeastern Germany, known as the Free State of Bavaria, with an area of 70,550.19 km2 (27,239.58 sq mi). It is the largest German state by land area, encompassing around a fifth of Germany's total land area. Despite being the second most populous state with over 13 million people, it has a lower population density due to its large physical size. Key cities include Munich, Nuremberg, and Augsburg.

Tuscany: Tuscany, in central Italy, is a region with an area of 23,000 sq km and a population of 3.8 million. Its capital is Florence.

Scandinavia: Scandinavia refers to a subregion in Northern Europe, encompassing Denmark, Norway, and Sweden. It has strong historical, cultural, and linguistic bonds between its people. The term may also include the Scandinavian Peninsula and is occasionally used interchangeably with Nordic countries. Iceland and the Faroe Islands are occasionally grouped with Scandinavia due to their linguistic connections with Sweden, Norway, and Denmark. Although Finland differs in this regard, it is sometimes classified as Scandinavian based on its economic and cultural similarities.

Moldavia: Moldavia, a historical region in Central and Eastern Europe, was an independent and later autonomous state from the 14th century to 1859. It encompassed the area between the Eastern Carpathians and the Dniester River, including Bessarabia, Bukovina, Hertsa, and Pokuttya at different times. Moldavia eventually united with Wallachia, forming the foundation of modern Romania.

Transylvania: Transylvania is a historical and cultural region in central Romania, bordered by the Carpathian and Apuseni Mountains. It also includes regions such as Crișana, Maramureș, and occasionally Banat. Transylvania has connections to parts of Western Moldavia and Bukovina. The region's capital is Cluj-Napoca.

Wallachia: Wallachia, also known as Walachia, is a historical region in Romania located north of the Lower Danube and south of the Southern Carpathians. It consists of two main sections, Muntenia and Oltenia, with Dobruja occasionally considered a third section. Wallachia is often referred to as Muntenia, connecting it with the larger traditional section.

Bashkortostan: Bashkortostan, officially known as the Republic of Bashkortostan or Bashkiria, is a Russian republic situated in Eastern Europe. It spans an area of 143,600 square kilometres and has a population of 4 million. It borders Perm Krai, Sverdlovsk Oblast, Chelyabinsk Oblast, Orenburg Oblast, Tatarstan, and Udmurtia. Ufa serves as its capital and largest city. Bashkortostan is the seventh most populous federal subject in Russia and boasts a rich cultural heritage.

Chechnya: Chechnya is a republic of Russia located in the North Caucasus, near the Caspian Sea. It shares borders with Georgia, Dagestan, Ingushetia, North Ossetia-Alania, and Stavropol Krai.

Dagestan: Dagestan, a republic of Russia, is located in the North Caucasus region of Eastern Europe. It shares borders with Azerbaijan, Georgia, Chechnya, Kalmykia, and Stavropol Krai. Makhachkala is its capital and largest city, while other important cities include Derbent, Kizlyar, Izberbash, Kaspiysk, and Buynaksk. The republic lies at the southernmost tip of Russia and is situated along the Caspian Sea.

Kaliningrad Oblast: Kaliningrad Oblast is a western Russian region situated on the Baltic Sea. It is surrounded by Poland and Lithuania, facing Sweden to the west. The province's main city is Kaliningrad, formerly known as Königsberg. The region has an ice-free port city called Baltiysk. In terms of population, Kaliningrad Oblast had around 1 million residents in 2021.

Sakha Republic: The Sakha Republic, also known as Yakutia, is the largest republic of Russia in the Russian Far East. It is located along the Arctic Ocean and has a population of one million. Covering over 3,083,523 square kilometers, it is the world's largest country subdivision. The capital and largest city, Yakutsk, is known as the world's coldest major city.

Siberia: Siberia is a vast region in North Asia, stretching from the Ural Mountains to the Pacific Ocean. It has been part of Russian territory since the conquests of the 16th century. Despite its size, Siberia has a sparse population, making up only one-fifth of Russia's total. The area covers over 13.1 million square kilometers, with Novosibirsk and Omsk as its largest cities.

Tatarstan: Tatarstan, officially the Republic of Tatarstan, is a Russian republic in Eastern Europe. It is part of the Volga Federal District, with Kazan as its capital and largest city. Tatarstan boasts a rich cultural heritage and is known for its significant oil reserves and thriving petrochemical industry.

Andalusia: Andalusia is the southernmost autonomous community in Spain. It is the most populous and second-largest region in the country. It is recognized as a historical nationality and is divided into eight provinces. The capital city is Seville and the seat of the High Court of Justice is in Granada.

Basque Country (autonomous community): The Basque Country is an autonomous community in northern Spain that comprises the provinces of Álava, Biscay, and Gipuzkoa. It is also home to an enclave called Treviño, which belongs to the neighboring autonomous community of Castile and León.

Catalonia: Catalonia is an autonomous community in Spain that holds the status of a nationality according to its Statute of Autonomy.

Galicia (Spain): Galicia is an autonomous community and historic nationality in Spain, situated in the northwest of the Iberian Peninsula. It comprises the provinces of A Coruña, Lugo, Ourense, and Pontevedra.

England: England is a country in the United Kingdom, located in the North Atlantic. It shares borders with Wales and Scotland, with Ireland across the Irish and Celtic Seas. England is separated from Europe by the North Sea and the English Channel. Covering 62% of Great Britain, it includes over 100 smaller islands like the Isles of Scilly and the Isle of Wight.

Scotland: Scotland is part of the UK, located in the northern part of Great Britain with over 790 nearby islands. It shares a 96-mile land border with England and is surrounded by the Atlantic Ocean, North Sea, and Irish Sea. The population is around 5.4 million, accounting for 8% of the UK's total. Edinburgh serves as the capital, while Glasgow is the largest city in Scotland.

Scottish Highlands: The Scottish Highlands is a historical region of Scotland that diverged culturally from the Lowlands in the Middle Ages. It is known for the replacement of Scottish Gaelic by Lowland Scots language. The area extends north and west of the Highland Boundary Fault, with the exact boundaries being unclear. The Great Glen separates the Grampian Mountains and the Northwest Highlands. The Scottish Gaelic name, A' Ghàidhealtachd, refers to "the place of the Gaels" and encompasses the Highlands and Western Isles.

Wales: Wales, a country within the United Kingdom, is bordered by England, the Irish Sea, the Celtic Sea, and the Bristol Channel. With a population of 3.1 million, it covers 21,218 square kilometres and boasts over 2,700 kilometres of coastline. The mountainous landscape is dominated by peaks like Snowdon. Wales experiences a maritime climate and its capital city is Cardiff.

Northern Ireland: Northern Ireland is part of the UK, located in the northeast of Ireland. It's considered a country, province, or region. With a population of 1,903,175, it makes up around 3% of the UK's population and 27% of the island of Ireland's population. The Northern Ireland Assembly handles devolved policies, while other matters fall under the UK Government. It collaborates with Ireland under the Belfast Agreement, and both governments discuss non-devolved issues through the British–Irish Governmental Conference (BIIG).

Gibraltar: Gibraltar is a British Overseas Territory and city in southern Iberian Peninsula, bordered by Spain. This 6.7km2 area is dominated by the Rock of Gibraltar, with a densely populated town area housing primarily 32,688 Gibraltarians.

Caribbean: The Caribbean is a subregion of the Americas, located southeast of the Gulf of Mexico. It includes the Caribbean Sea and its islands, some of which are surrounded by the Caribbean Sea while others border both the Caribbean Sea and the North Atlantic Ocean. The region is also home to nearby coastal areas on the mainland.

Central America: Central America is a subregion of the Americas bordering Mexico to the north and Colombia to the south. It consists of seven countries: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, and Panama. The region is known for its Mesoamerican biodiversity hotspot and experiences frequent seismic activity due to geologic faults and volcanic eruptions.

British Columbia: British Columbia is Canada's westernmost province, bordered by Alberta, the Yukon, the Northwest Territories, and the US states of Washington, Idaho, and Montana. It boasts diverse geography, including coastlines, beaches, forests, lakes, deserts, and plains. With a population of over 5.5 million, it's the third most populous province in Canada. The capital is Victoria, while Vancouver is the largest city and forms part of the third-largest metropolitan area in the country.

Alberta: Alberta is a province located in Western Canada, bordered by British Columbia, Saskatchewan, the Northwest Territories, and Montana. It is one of only two landlocked provinces in Canada. Alberta is known for its diverse landscapes, with the eastern part occupied by the Great Plains and the western part bordering the Rocky Mountains. The province experiences a predominantly continental climate with quick temperature changes and occasional Chinook winds in the west. It is one of the three prairie provinces in Canada.

Ontario: Ontario, Canada's southernmost province, is the country's most populous and second-largest in area. It encompasses the nation's capital, Ottawa, and the major city of Toronto, which serves as its provincial capital. With 38.5% of Canada's population, Ontario plays a significant role in the country's demographics.

Quebec: Quebec is the largest province in Canada, with a dense urban population along the St. Lawrence River. It shares borders with Ontario, Newfoundland and Labrador, New Brunswick, and Nunavut, while also having a border with the United States.

New England: New England is a region in the northeastern US, consisting of six states - Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. It is bordered by New York, New Brunswick, and Quebec. The area is characterized by its proximity to the Gulf of Maine and the Atlantic Ocean. Boston is the largest city and Massachusetts's capital. The Greater Boston metropolitan area is the most populous, including cities like Worcester, Manchester, and Providence.

New York (state): New York, also known as New York State, is a populous state in the Northeastern United States. It shares borders with New England and Canada, and has a population of nearly 19.6 million people. With an area of 54,556 square miles (141,300 km2), it is the 27th largest state in the US.

Pennsylvania: Pennsylvania, officially known as the Commonwealth of Pennsylvania, is a state located in the Mid-Atlantic and Northeastern regions of the United States. It shares borders with Delaware, Maryland, West Virginia, Ohio, New York, and New Jersey. The state also touches Lake Erie and the Canadian province of Ontario.

Southern United States: The Southern United States is a region between the Atlantic Ocean and the Western United States, with the Midwestern and Northeastern United States to the north and the Gulf of Mexico and Mexico to the south. It is known for its distinct culture and geography.

Florida: Florida is a Southeastern state in the US, bordered by the Gulf of Mexico, Alabama, Georgia, the Bahamas, and the Atlantic Ocean. It is unique as it borders both the Gulf of Mexico and the Atlantic Ocean. With over 21 million people, it is the third-most populous state and ranks eighth in population density. Spanning 65,758 square miles, it is the 22nd largest state. The Miami metropolitan area is the largest with a population of 6.138 million, while Jacksonville is the most populous city with 949,611 people. Other major population centers include Tampa Bay, Orlando, Cape Coral, and Tallahassee, the state capital.

Texas: Texas is a large state in the South Central region of the United States. It is the second largest in terms of both area and population, with over 30 million residents. Texas borders Louisiana, Arkansas, Oklahoma, New Mexico, and various Mexican states. Additionally, it has a coastline along the Gulf of Mexico.

Midwestern United States: The Midwestern United States, also known as the American Midwest, is a census region occupying the northern central part of the country. It lies between the Northeastern and Western United States, with Canada to the north and the Southern United States to the south. It was initially called the North Central Region until 1984 by the U.S. Census Bureau.

Illinois: Illinois is a Midwestern state in the USA. It is bordered by the Great Lakes, Mississippi River, and Wabash and Ohio rivers. The largest cities are Chicago and Metro East. Other notable cities include Peoria, Rockford, Springfield, and Champaign-Urbana. Illinois ranks fifth in GDP, sixth in population, and 25th in land area among US states.

Western United States: The Western United States refers to the westernmost states of the U.S. This region shifted as American settlement moved west, initially considering the Appalachian Mountains as the western frontier before eventually including the lands west of the Mississippi River.

Alaska: Alaska is a U.S. state in Northwest North America, bordering Canada to the east and Russia's Chukotka Autonomous Okrug to the west. It is surrounded by the Arctic and Pacific Oceans. Alaska is the world's largest exclave and is known for its unique location and size.

California: California is a populous state in the western US, known for its large population and extensive land area. It is the most populous state in the US, third-largest by area, and has a coastline on the Pacific Ocean. It shares borders with Oregon, Nevada, Arizona, and the Mexican state of Baja California.

Silicon Valley: Silicon Valley is a global hub for technology and innovation, located in Northern California. It encompasses the southern part of the San Francisco Bay Area and the Santa Clara Valley. It serves as the center of high-tech business in the region and represents California's thriving tech industry.

Hawaii: Hawaii: island state in the Western U.S., 2,000 miles from mainland in Pacific Ocean. Only U.S. state outside North America, an archipelago, and located in the tropics.

American Samoa: American Samoa is a US unincorporated territory in the South Pacific, located southeast of Samoa. It is the southernmost US territory and one of two south of the Equator.

Guam: Guam, an unincorporated territory of the United States, is located in the Micronesia region of the western Pacific Ocean. It is the westernmost point of the U.S., and Hagåtña serves as its capital. As the largest and southernmost island in Micronesia, Guam is also the largest among the Mariana Islands.

Northern Mariana Islands: The Northern Mariana Islands, officially known as the Commonwealth of the Northern Mariana Islands (CNMI), is an unincorporated U.S. territory in the Pacific Ocean. It consists of 14 islands and is part of the Mariana Archipelago. Guam is the southernmost island and a separate U.S. territory. Until 1990, the Northern Mariana Islands were considered a non-self governing territory by the United Nations.

Puerto Rico: Puerto Rico is a Caribbean island and unincorporated territory of the United States. It is located in the northeast Caribbean Sea, between the Dominican Republic and the U.S. Virgin Islands. It has a population of approximately 3.2 million residents, with San Juan as its capital and largest city. Puerto Rico is officially known as the Commonwealth of Puerto Rico, and it has both Spanish and English as its official languages.

Oceania: Oceania is a region encompassing Australasia, Melanesia, Micronesia, and Polynesia. It spans across the Eastern and Western Hemispheres, with a land area of 9 million square kilometers and a population of 44.4 million. Oceania is the smallest continent in terms of land area and the second least populated, trailing behind Antarctica.

Melanesia: Melanesia is a subregion of Oceania located in the southwestern Pacific Ocean. It spans from New Guinea in the west to the Fiji Islands in the east, and encompasses the Arafura Sea.

Micronesia: Micronesia is a small island subregion of Oceania, encompassing around 2,000 islands in the Northwestern Pacific Ocean. It shares a cultural heritage with Maritime Southeast Asia to the west, Polynesia to the east, and Melanesia to the south. Additionally, Micronesia is part of the broader Austronesian community.

Polynesia: Polynesia is a subregion of Oceania comprising over 1,000 islands in the central and southern Pacific Ocean. The indigenous people, called Polynesians, share language, cultural practices, and traditional beliefs. Their historical tradition involves skilled navigation using stars.

New South Wales: New South Wales is a state on Australia's east coast. It shares borders with Queensland, Victoria, and South Australia. Its capital is Sydney, the country's most populous city. With a population of over 8 million, New South Wales is Australia's most populous state, with the majority residing in the Greater Sydney area. It is also home to the Australian Capital Territory and Jervis Bay Territory, and its coast meets the Coral and Tasman Seas.

Tasmania: Tasmania is an island state located to the south of the Australian mainland, separated by the Bass Strait. It consists of the main island of Tasmania and around 1000 surrounding islands. With a population of 569,825 people, it is Australia's least populous state. Hobart, the state capital, is its largest city and home to around 40 percent of the population. Tasmania is known for being the southernmost point of the country and is recognized as one of the world's 26th-largest islands.

French Guiana: French Guiana is a department of France situated in South America's Guianas region. It borders Suriname to the west and Brazil to the east and south, encompassing a land area of 83,534 km2 (32,253 sq mi) and a population of 295,385.

Latin America: Latin America refers to a region in the Americas where Romance languages are predominantly spoken. Coined in the mid-19th century in France, it includes areas in the Americas once ruled by the Spanish, Portuguese, and French empires.

Patagonia: Patagonia is a region in South America, shared by Argentina and Chile. It is characterized by the majestic Andes Mountains, beautiful lakes, fjords, rainforests, and glaciers in the west, while the east features deserts, tablelands, and steppes. Patagonia is surrounded by the Pacific Ocean on the west, the Atlantic Ocean on the east, and various connecting water bodies including the Strait of Magellan, the Beagle Channel, and the Drake Passage to the south.

Southern Cone: The Southern Cone is a geographical and cultural subregion in South America, located mainly south of the Tropic of Capricorn. It encompasses Argentina, Chile, and Uruguay, with some considering Brazil's southernmost states as part of it. Paraguay is also sometimes included. The region is bounded by the Pacific Ocean to the west and the Atlantic Ocean to the east. It shares a common history and geography, and is known for its social, economic, and political significance.

Minas Gerais: Minas Gerais is a state in Southeastern Brazil, known for its significant population and economic contributions. Its capital, Belo Horizonte, is a major financial center in Latin America. The state has produced the most Brazilian presidents and holds 10.1% of the country's population. It also contributes 8.7% to the Brazilian GDP, making it a crucial economic powerhouse.

City: A city is a large human settlement with no fixed size limit. It can also refer to smaller settlements. In a narrower sense, a city is a densely populated place with defined boundaries where people primarily work in non-agricultural jobs. Cities have housing, transportation, sanitation, utilities, and communication systems. They facilitate interaction between people, government, and businesses, improving the distribution of goods and services.

Capital city: A capital city is the main municipality in a country or subnational division that serves as the government's seat. It typically houses the offices and meeting places of the government and is designated as the capital by law or constitution. In some cases, multiple cities may serve as official capitals or the seat of government may be in a different location.

City block: A city block, also known as a residential or urban block, is a crucial aspect of urban planning and design. Its role is central to organizing and shaping cities.

Downtown: Downtown is a term primarily used in North America to describe the central part of a city, combining its commercial, cultural, historical, political, and geographic aspects. It is often referred to as the central business district and usually has a smaller percentage of a city's employment. Downtowns are often surrounded by lower population densities and incomes compared to suburbs. In some metropolitan areas, downtowns are characterized by tall buildings, cultural institutions, and the convergence of rail and bus lines. The term "city centre" is predominantly used in British English.

Ghetto: A ghetto is a marginalized area in a city where minority groups reside due to various pressures. These areas are often impoverished and exist worldwide, with different names and classifications.

Neighbourhood: A neighbourhood is a localized community within a larger area, with buildings and a sense of community. It is characterized by face-to-face interactions among members. Neighbourhoods are spatial units where social interactions happen and common values are cultivated, youth are socialized, and social control is maintained.

Rural area: A rural area is a geographic region located outside of towns and cities. It has low population density, small settlements, and is often associated with agriculture and forestry. The definition of rural varies across countries for statistical and administrative purposes.

Slum: A slum is a densely populated residential area associated with poverty, typically found in urban or suburban locations with inadequate housing and poor living conditions. Slums lack reliable sanitation, clean water, electricity, law enforcement, and other basic services. The housing units range from shanty houses to poorly constructed or unmaintained buildings.

Suburb: A suburb is a residential area in a metropolitan region with varying population density and house types. Many suburbs serve as job centers and have their own political jurisdiction. However, in some countries like the UK, suburbs are often part of the larger city's administrative boundaries. Suburbs are typically located within commuting distance of a city and can be considered a separate residential community. They are distinct from central city areas and are often compared to neighborhoods in the United States.

Town: A town is a human settlement, larger than a village but smaller than a city. The criteria to distinguish towns from villages and cities vary worldwide.

Urban design: Urban design focuses on the design of buildings and spaces in cities, considering economic, social, and environmental aspects. It involves designing physical features of towns, cities, and regions, from individual streets to entire cities. Urban designers connect architecture, landscape architecture, and urban planning to improve community environments and organize physical space effectively.

Urban planning: Urban planning, also known as city planning or town planning, is a technical and political process that focuses on developing and designing land use and the built environment. It involves considering factors like transportation, communication, sanitation, and environmental protection. Historically, it followed a top-down approach, but it now prioritizes social and environmental well-being. Sustainable development has become a key goal due to the negative impacts of previous planning models. Recently, there has been a greater emphasis on considering the interests and needs of residents, businesses, and communities.

Urbanization: Urbanization is the movement of people from rural to urban areas, resulting in decreased rural population. It involves the formation and growth of towns and cities as more individuals reside and work in central areas.

Village: A village is a small human settlement, larger than a hamlet but smaller than a town, with a population ranging from a few hundred to a few thousand. They can be found in both rural and urban areas, with fixed dwellings that are relatively close to each other. Some villages may be transient, and not scattered widely across the landscape.

Zoning: Zoning is a method used in urban planning where land is divided into zones with specific regulations for new development. These regulations govern the use, density, size, and shape of buildings within each zone. Zoning determines if planning permission can be granted and guides urban growth and development.

Industrial park: An industrial park is a planned area dedicated to industrial development, often seen as a more intensive version of a business or office park. It is characterized by zoning specifically for industries and can include light or heavy manufacturing. These parks are known for their fast construction process, utilizing steel sheds that can be quickly assembled.

Algiers: Algiers is the capital and largest city of Algeria, with a population of around 4.5 million. It is located in the north-central part of the country.

Constantine, Algeria: Constantine, Algeria is the capital of Constantine Province in northeastern Algeria. It was previously known as Cirta during Roman times and was later renamed "Constantina" to pay tribute to Emperor Constantine the Great. Situated approximately 80 kilometers from the Mediterranean coast, Constantine is positioned on the banks of the Rhumel River.

Oran: Oran is a significant coastal city in northwest Algeria, ranking second only to the capital, Algiers. It boasts a high population and holds great commercial, industrial, and cultural importance. Situated 432 km (268 mi) west-southwest of Algiers, the city had a population of 803,329 in 2008. Additionally, its metropolitan area is home to around 1.5 million people, establishing it as the country's second-largest city.

Alexandria: Alexandria is a significant city in Egypt, second largest in size and largest on the Mediterranean coast. It was established in 331 BC by Alexander the Great and quickly flourished as a center of Hellenic civilization, eventually replacing Memphis as Egypt's capital. Known as the "Bride of the Mediterranean," Alexandria is now a popular tourist spot and notable industrial center due to its natural gas and oil pipelines from Suez.

Aswan: Aswan is the capital of the Aswan Governorate in Southern Egypt.

Cairo: Cairo is the capital and largest city of Egypt, with a population of 10 million. It is also part of the Greater Cairo metropolitan area, which is the 12th-largest urban agglomeration in the world, housing over 22.1 million people.

Damietta: Damietta is a port city in Egypt and the capital of the Damietta Governorate. It lies on the Damietta branch of the Nile Delta, 15 kilometers from the Mediterranean Sea. In the past, it was a Catholic bishopric and currently serves as a member of the UNESCO Global Network of Learning Cities.

Giza: Giza, Egypt's third-largest city, is located on the west bank of the Nile, opposite central Cairo. It is the capital of Giza Governorate and part of the Greater Cairo metropolis. Giza has a population of 4,872,448 and is known for being home to the iconic Giza Plateau, which includes the Great Pyramids, Sphinx, and other ancient structures. Additionally, it is situated near Memphis, the former capital of Egypt during the reign of pharaoh Narmer in 3100 BC.

Luxor: Luxor, the capital of Luxor Governorate in Upper Egypt, is an ancient city with a rich history. It encompasses the site of the Ancient Egyptian city of Thebes and is among the world's oldest inhabited cities. With a population of 1,333,309 and an area of approximately 417 km2, Luxor is renowned for its cultural significance and historical landmarks.

Benghazi: Benghazi, Libya's second-most populous city, is the largest city in Cyrenaica. With an estimated population of 1,207,250 in 2020, it is situated on the Gulf of Sidra and serves as a significant seaport.

Tripoli, Libya: Tripoli, Libya is the capital and largest city of the country, with a population of about 1.183 million people in 2023. It is situated on a rocky land projecting into the Mediterranean Sea, forming a bay, and houses the port of Tripoli. The city serves as the main commercial and manufacturing center of Libya and is home to the University of Tripoli. Additionally, Tripoli is famous for the Bab al-Azizia barracks, which was formerly the residence of Muammar Gaddafi, who ruled the country from there.

Casablanca: Casablanca is a major city in Morocco, serving as the country's economic and business hub. Situated on the Atlantic coast, it is the most populous city in the Maghreb region and the eighth-largest in the Arab world. With a population of over 4.27 million, Casablanca is known for its central-western location and its importance in Morocco's urban area.

Fez, Morocco: Fez, Morocco is a city in northern inland Morocco, and the capital of the Fès-Meknès region. It is the second largest city in Morocco, with a population of 1.11 million. Situated near the Atlas Mountains, Fez is known for its hills and the Fez River. The city has earned the nicknames "Mecca of the West" and "Athens of Africa". Fez is considered the spiritual and cultural capital of Morocco.

Marrakesh: Marrakesh, the fourth largest city in Morocco, is a major cultural center, serving as the capital of the Marrakesh–Safi region. It is situated west of the Atlas Mountains' foothills and is recognized as one of the country's four imperial cities.

Rabat: Rabat is the capital city of Morocco with a population of around 580,000. It is situated on the Atlantic Ocean, at the mouth of the river Bou Regreg, and is adjacent to the city of Salé. Rabat is also the capital of the administrative region of Rabat-Salé-Kénitra.

Khartoum: Khartoum, the capital of Sudan, boasts the largest metropolitan area in the country, with a population of 6,344,348.

Omdurman: Omdurman is a populous city in Sudan, the second largest in the country and situated on the west bank of the River Nile. It is a vital transportation hub due to its location on the river, offering an important linking point for roads.

Tunis: Tunis is Tunisia's capital and largest city with a population of around 2.7 million. It ranks as the third-largest city in the Maghreb and the eleventh-largest in the Arab world.

Luanda: Luanda is the capital and largest city of Angola, serving as its primary port and major industrial, cultural, and urban center. Situated on the northern Atlantic coast, it is the administrative hub, chief seaport, and capital of the Luanda Province. With a metropolitan population of over 8.3 million in 2020, it is the most populous Portuguese-speaking capital city globally, and the most populous Lusophone city outside Brazil.

Douala: Douala is Cameroon's largest city and economic capital, as well as the capital of the Littoral Region. It was home to Central Africa's largest port, now replaced by Kribi port. Douala International Airport is the country's main international airport. The city is a major commercial and economic hub, handling exports of oil, cocoa, coffee, timber, metals, and fruits. With a population of around 5.8 million, Douala sits on the estuary of Wouri River and has a tropical climate.

Yaoundé: Yaoundé is the capital and second-largest city of Cameroon, with a population of over 2.8 million. Located in the Centre Region, it sits at an elevation of approximately 750 meters above sea level.

N'Djamena: N'Djamena is the capital of Chad and the country's largest city. It is also a special statute region, with 10 districts or arrondissements.

Kinshasa: Kinshasa is the capital and largest city of the Democratic Republic of the Congo. It was formerly called Léopoldville. It is now a rapidly-growing megacity with a population of 16 million, making it the most densely populated city in the country and the most populous in Africa. Kinshasa is a major economic, political, and cultural center in the DRC and Africa. It is home to various industries, including manufacturing, telecommunications, banking, and entertainment, and hosts significant institutional buildings and federal departments.

Lubumbashi: Lubumbashi is the second-largest city in the Democratic Republic of the Congo, located in the southeastern part near Zambia. It serves as the capital of Haut-Katanga Province and is a major mining center with significant mining companies. The urban area has an estimated population of around 2,584,000 in 2021.

Mbuji-Mayi: Mbuji-Mayi is the capital of Kasai-Oriental Province in the Democratic Republic of Congo. It is considered the second largest city in the country, with an estimated population ranging from 1,480,000 to 3,500,000.

Brazzaville: Brazzaville is the capital and largest city of the Republic of the Congo. Located on the north side of the Congo River, it serves as the country's financial and administrative center. It is a department and a commune and is situated across from Kinshasa, the capital city of the Democratic Republic of the Congo.

Asmara: Asmara, or Asmera, is the capital and largest city of Eritrea, situated in the country's Central Region. It is the sixth highest capital in the world and the second highest in Africa. Asmara is located on an escarpment at the junction of the Eritrean Highlands and the Great Rift Valley in Ethiopia. It became a UNESCO World Heritage Site in 2017 due to its well-preserved modernist architecture. The city has a long history, first settled in 800 BC and later founded in the 12th century AD after multiple villages joined together. Asmara was named the capital of Eritrea during Italian rule in the late 19th century.

Kigali: Kigali, the capital of Rwanda, is a dynamic city located in the country's center. Known for its hilly landscape and picturesque valleys, Kigali has emerged as a key economic, cultural, and transportation hub. Established in 1907, it became the capital in 1962, superseding Huye as the focal point of the nation.

Addis Ababa: Addis Ababa is Ethiopia's capital and largest city, with a population of approximately 2.7 million people. This highly developed city serves as a significant cultural, artistic, financial, and administrative hub in Ethiopia, and it is also the capital of the Oromia Region.

Dire Dawa: Dire Dawa is a chartered city in eastern Ethiopia, bordering Oromia and Somali Region. It was previously an autonomous region until it was divided into a separate chartered city in 1993.

Gondar: Gondar (or Gonder) is a city in Ethiopia, situated in the North Gondar Zone of the Amhara Region. It is located north of Lake Tana on the Lesser Angereb River and southwest of the Simien Mountains. Gondar has an estimated population of 487,224 as of 2023.

Mombasa: Mombasa is a coastal city in southeastern Kenya, known as the country's oldest and second-largest city after Nairobi. It was the initial capital of British East Africa and currently serves as the capital of Mombasa County. With a population of approximately 1,208,333 people, it is often referred to as "the white and blue city." Mombasa's metropolitan region, home to 3,528,940 people, is the second-largest in Kenya.

Nairobi: Nairobi is Kenya's capital and largest city, derived from the Maasai phrase Enkare Nairobi, meaning 'place of cool waters'. It is known as The Green City in the Sun and is home to the Nairobi River. With a population of 4,397,073, it is a vibrant and bustling hub.

Antananarivo: Antananarivo, also known as Tana, is the capital and largest city of Madagascar. Situated at 1,280 m (4,199 ft) above sea level, it holds the distinction of being the highest national capital among island countries. The city has long been the country's largest population center and serves as the administrative capital of the Analamanga region. Antananarivo is home to the presidency, National Assembly, Senate, Supreme Court, and numerous diplomatic missions, national and international businesses, and NGOs. It boasts a vibrant cultural scene with numerous universities, art venues, nightclubs, and medical services. Additionally, the city is a hub for sports, hosting various national and local teams, including the championship-winning national rugby team, the Makis.

Lilongwe: Lilongwe is the capital and largest city of Malawi, located in the central region. It has a population of over 1 million people and serves as an economic and transportation hub for central Malawi. Named after the Lilongwe River, it is situated near the borders with Mozambique and Zambia.

Beira, Mozambique: Beira is the capital and largest city of Sofala Province in Mozambique. It is located where the Pungwe River meets the Indian Ocean. With a population of over half a million, it is the fourth-largest city in the country. Beira is known for its important Port, serving as a gateway for landlocked countries like Zimbabwe, Zambia, and Malawi.

Maputo: Maputo is the capital and largest city of Mozambique, located near the southern border. With a population of over 1 million, it is a bustling port city known for its vibrant cultural scene and unique architecture. Maputo's economy thrives on commerce, and it includes the neighboring city of Matola in its metropolitan area. Formerly known as Lourenço Marques until 1976.

Mogadishu: Mogadishu, also known as Xamar or Hamar, is the capital of Somalia and its largest city with a population of around 2.6 million people. It has been a crucial port for trade across the Indian Ocean for thousands of years. Located on the Banadir coast, Mogadishu is unique as it is considered a municipality rather than a regional administration.

Dar es Salaam: Dar es Salaam is the biggest city and financial center of Tanzania, serving as the capital of Dar es Salaam Region. With a population of over six million, it is the largest city in East Africa and the sixth-largest in Africa. Situated on the Swahili coast, it is a significant economic hub and among the world's fastest-growing cities.

Kampala: Kampala is Uganda's capital and biggest city with a population of 1,680,600 (2020). It is divided into Kampala Central, Kawempe, Makindye, Nakawa, and Rubaga divisions.

Lusaka: Lusaka is the capital and largest city of Zambia, positioned on the central plateau. It is a rapidly developing city with a population of approximately 3.3 million. Lusaka serves as the economic and political hub of Zambia, connecting to major highways in all directions. The city administration uses English as the official language, while Bemba, Tonga, Lenje, Soli, Lozi, and Nyanja are commonly spoken on the streets.

Harare: Harare, once known as Salisbury, is Zimbabwe's capital and largest city.

Gaborone: Gaborone, the capital and largest city of Botswana, has a population of 246,325 (10% of the country's total) according to the 2022 census. The city's agglomeration houses 421,907 residents, as recorded in the 2011 census.

Windhoek: Windhoek is the capital and largest city of Namibia, situated at an elevation of 1,700 m (5,600 ft) above sea level in central Namibia. It is located in the Khomas Highland plateau area and serves as the country's geographic center. With a population of 431,000 in 2020, the city is experiencing continuous growth due to migration from other regions within Namibia.

Cape Town: Cape Town, the legislative capital of South Africa, is the country's oldest city and home to the Parliament. As the second-largest city and the largest in the Western Cape, it is also a part of the City of Cape Town metropolitan municipality.

Durban: Durban is the largest city in KwaZulu-Natal, South Africa. It is the third-most populous city in the country and was a host city for the 2010 FIFA World Cup. It is part of the eThekwini Metropolitan Municipality with a population of approximately 4 million, making it one of the largest cities on the African continent's Indian Ocean coast.

Gqeberha: Gqeberha (formerly Port Elizabeth), also known as P.E., is a significant seaport and the largest city in South Africa's Eastern Cape province. It serves as the headquarters for the Nelson Mandela Bay Metropolitan Municipality, the country's second-smallest metropolitan municipality in terms of area. With its position as the sixth most populous city in South Africa, Gqeberha plays a vital role as the cultural, economic, and financial center of the Eastern Cape.

Johannesburg: Johannesburg, South Africa's most populous city, is a megacity and one of the largest urban areas globally. It is the capital of Gauteng, the country's wealthiest province, and home to the Constitutional Court. Johannesburg serves as the headquarters for major South African companies and banks. With its location in the mineral-rich Witwatersrand hills, it holds significant global importance in the gold and diamond trade.

Pretoria: Pretoria is the administrative capital of South Africa, housing the executive branch of government and all foreign embassies to the country.

Conakry: Conakry, the capital and largest city of Guinea, is a prominent port city that serves as the economic, financial and cultural center of the country. With a population of 1,660,973 as per the 2014 census, it holds great significance in Guinea's socio-economic landscape.

Monrovia: Monrovia is the capital city of Liberia, located on Cape Mesurado on the Atlantic coast. It has a population of over 1 million residents, making up 29% of Liberia's total population. As the primate city, Monrovia is the country's economic, financial, and cultural hub, with a thriving harbor and serving as the seat of government.

Cotonou: Cotonou, the largest city in Benin, had an official population count of 679,012 inhabitants in 2012. However, its larger urban area is home to over two million people.

Ouagadougou: Ouagadougou, also known as Ouaga, is the capital and largest city of Burkina Faso. It serves as the administrative, cultural, economic, and communication hub of the nation. With a population of 2,415,266 in 2019, its inhabitants are referred to as ouagalais. The city's name is derived from French orthography used in former French African colonies.

Accra: Accra is the capital and largest city of Ghana, situated on the southern coast at the Gulf of Guinea. The Accra Metropolitan District has a population of 284,124, and the larger Greater Accra Region has a population of 5,455,692. The name "Accra" typically refers to the Accra Metropolitan District, which was larger before 2008. It has now been divided into 13 local government districts. The Accra Metropolitan District is the only district within the capital to have city status. It serves as the capital of Ghana and is known as the "City of Accra."

Kumasi: Kumasi is a major city in Ghana's Ashanti Region, known for its historical significance as the capital of the Ashanti Empire. Situated near Lake Bosomtwe, it is a thriving hub for commerce, industry, and culture. Referred to as "The Garden City" for its abundant plant life, Kumasi is also called Oseikrom, in honor of its notable king, Osei Kofi Tutu I.

Abidjan: Abidjan is the economic capital of Ivory Coast, boasting a population of 6.3 million people, which represents over 20% of the country's total population. It stands as the sixth most populous city in Africa, following Lagos, Cairo, Kinshasa, Dar es Salaam, and Johannesburg. Abidjan serves as a cultural hub in West Africa and is renowned for its advanced industrial and urban development. Additionally, this vibrant city holds the distinction of being the most populous in Africa when it comes to both Dioula and French speakers.

Bamako: Bamako is Mali's capital and largest city, situated near the rapids on the Niger River. It has a population of 4,227,569 as of 2022.

Niamey: Niamey is the capital and largest city of Niger, located on the Niger River. With a population of over 1 million, it is situated on the east bank. The city's growth rate is slower than the country as a whole, known for having the world's highest fertility rate. Niamey is known for its pearl millet agriculture and manufacturing industries, producing bricks, ceramics, cement, and textiles.

Abuja: Abuja is Nigeria's capital and eighth most populous city, located in the Federal Capital Territory. It was planned and constructed in the 1980s by International Planning Associates, with the Central Business District designed by Japanese architect Kenzo Tange. Abuja replaced Lagos as the capital on 12 December 1991.

Benin City: Benin City is the capital of Edo State in southern Nigeria, known for its rich historical heritage. The city houses the Benin City National Museum, showcasing terracotta sculptures and artifacts from the Benin empire. The Oba's palace features bronze plaques depicting historical events. It is the fourth-largest city in Nigeria, located 40 kilometres north of the Benin River. Benin City serves as a major hub for Nigeria's rubber and oil industries.

Enugu: Enugu is the capital city of Enugu State in southeastern Nigeria, known for its hilly geography. With a population of 820,000, it acquired township status in 1917 and was renamed Enugu in 1928 due to rapid expansion.

Ibadan: Ibadan is the capital and largest city of Oyo State, Nigeria. With a population of over 3.6 million, it is the third-largest city in the country. It has a metropolitan area with over 6 million people. Ibadan is the largest city in Nigeria in terms of geographical area. It was once the largest city in Nigeria and the second most populous in Africa. It is ranked as the second fastest-growing city in Africa and third in West Africa for tech startups. In 2016, Ibadan joined UNESCO's Global Network of Learning Cities.

Kaduna: Kaduna is the capital city of Kaduna State and the former political capital of Northern Nigeria. It serves as a trade center and a major transportation hub, providing access to the northern states of Nigeria. Located on the Kaduna River, it boasts a well-connected rail and road network.

Kano (city): Kano is a city in northern Nigeria and the capital of Kano State. It is the second largest city in Nigeria, known for its role in the trans-Saharan trade. With over ten million citizens, Kano has been a trade hub and settlement for centuries. The city is under the traditional rule of the Dabo dynasty, with the Kano Emirate Council serving as the current traditional institution.

Lagos: Lagos is the most populous city in Nigeria and the most populous urban area in Africa, with an estimated population of 21 million in 2015. It was the national capital of Nigeria until 1991 when it was moved to Abuja. Lagos is a major financial center and the economic hub of Lagos State and Nigeria. It greatly influences commerce, entertainment, technology, education, politics, tourism, art, and fashion in Africa. Additionally, it is one of the world's fastest-growing cities and urban areas, with the fourth-highest GDP in Africa. It houses a large and busy seaport and is classified as a Medium-Port Megacity due to its large population and port traffic volumes.

Maiduguri: Maiduguri is the capital and largest city of Borno State in north-eastern Nigeria. Situated along the Ngadda River, it is known for its proximity to the Firki swamps near Lake Chad. Founded in 1907 as a British military outpost, Maiduguri now has an estimated population of around two million as of 2022.

Port Harcourt: Port Harcourt is the capital of Rivers State in Nigeria and the fifth most populous city in the country. It is located in the oil-rich Niger Delta, along the Bonny River. The urban population is estimated to be around 3.48 million in 2023. The metropolitan area has a population of approximately 2.34 million according to a 2015 UN estimate. The city has experienced significant population growth, with a 4.99% annual change since 2015. In 1950, the population was around 59,752.

Dakar: Dakar is the capital and largest city of Senegal, with a population of over 1 million. The metropolitan area of Dakar is estimated to have a population of nearly 4 million in 2021.

Freetown: Freetown is the capital and largest city of Sierra Leone, situated on the Atlantic Ocean. It serves as the major urban, economic, and political center of the country, hosting the government. With a population of over 1 million, Freetown is a significant port city and an important hub for finance, culture, and education in Sierra Leone.

Calgary: Calgary is the largest city in the province of Alberta and the third-largest city in Canada. It forms the largest metro area within the three Prairie Provinces region. With a population of 1,306,784 in the city proper and 1,481,806 in the metropolitan area, Calgary ranks as the fifth-largest metropolitan area in Canada as of 2021.

Montreal: Montreal is the second most populous city in Canada, located in the province of Quebec. It was founded in 1642 as Ville-Marie and is named after Mount Royal. The city is centered on the Island of Montreal and is surrounded by smaller islands. It is 196 km east of Ottawa and 258 km southwest of Quebec City.

Ottawa: Ottawa is the capital of Canada, located in Ontario where the Ottawa River meets the Rideau River. It borders Gatineau, Quebec and is the heart of the Ottawa-Gatineau metropolitan area. With a population of over 1 million, it is the fourth-largest city and metro area in Canada.

Toronto: Toronto is the capital of Ontario and the largest city in Canada, with a population of 2.8 million. It is the fourth-most populous city in North America and part of the Golden Horseshoe, home to 9.8 million people. Known for its multiculturalism, Toronto is a thriving hub for business, finance, arts, sports, and culture.

Vancouver: Vancouver is a major city in western Canada, located in British Columbia's Lower Mainland region. It is the most populous city in the province, with a population of 662,248 in 2021. The Metro Vancouver area, including the Fraser Valley, has a population of 2.6 million, making it the third-largest metropolitan area in Canada. The city has a high population density of over 5,700 people per square kilometer, the highest in Canada and the fourth highest in North America.

Boston: Boston is the capital and largest city of Massachusetts. It serves as the cultural and financial hub of New England. With a population of 675,647 in 2020, it covers an area of 48.4 sq mi. The Greater Boston metropolitan area is the eleventh-largest in the United States.

New York City: New York City, often referred to as NYC, is the most populous city in the United States. Located at the southern tip of New York State, it has one of the world's largest natural harbors. The city is composed of five boroughs, each corresponding to a county. NYC is a global city with significant influence in various fields such as finance, entertainment, media, and technology. It is home to the headquarters of the United Nations and is renowned for its international diplomacy. Known as a major cultural hub and a center for commerce, New York City also excels in areas such as research, education, art, fashion, and sports.

Philadelphia: Philadelphia, commonly known as Philly, is Pennsylvania's most populous city and the second-most populous city in the Northeast megalopolis and Mid-Atlantic regions. It was the capital of the United States until 1800. Philadelphia has a population of 1,603,797 and is the sixth-most populous city in the country. It is also the urban core of the Delaware Valley, one of the world's largest metropolitan regions with over 6 million residents. Philadelphia is historically significant, particularly in the American Revolution, and remains influential in various fields such as business, culture, sports, and music.

Pittsburgh: Pittsburgh is a city in Pennsylvania, known for being the county seat of Allegheny County. It's the second-most populous city in the state, with a population of 302,971 as of 2020. Located in Western Pennsylvania, Pittsburgh is the anchor of the Pittsburgh metropolitan area. With a population of 2.457 million, it is the largest city in both the Ohio Valley and Appalachia. Additionally, Pittsburgh is the principal city of the greater Pittsburgh–Weirton–Steubenville combined statistical area, which extends into neighboring states.

Baltimore: Baltimore is the largest city in Maryland and the 30th most populous city in the United States. It is an independent city with a population of around 585,708 people. The Baltimore metropolitan area has approximately 2.8 million residents, ranking it as the 20th largest metropolitan area in the US. When combined with the Washington metropolitan area, the Washington–Baltimore CSA becomes the third-largest in the country, with a population of around 9.9 million as of 2020.

Washington, D.C.: Washington, D.C. is the capital city of the United States. It is located on the east bank of the Potomac River and borders Virginia and Maryland. The city is named after George Washington, the first U.S. president, and the district is named after the female personification of the nation, Columbia.

Nashville, Tennessee: Nashville, Tennessee is the capital and largest city of the state. It has a population of 689,447, making it the 21st most populous city in the U.S. and the fourth most populous in the southeastern region. Situated on the Cumberland River, Nashville is the hub of the Nashville metropolitan area and is experiencing rapid growth.

Charlotte, North Carolina: Charlotte, North Carolina is the largest city in North Carolina and the county seat of Mecklenburg County. With a population of 874,579 in 2020, it is the 15th most populous city in the United States and the second most populous in the Southeast. As the cultural, economic, and transportation hub of the Charlotte metropolitan area, its population in 2020 was 2,660,329, making it the 22nd largest in the country. Charlotte is also part of the Metrolina region, which encompasses a total population of 2,822,352 across sixteen counties.

Atlanta: Atlanta is the capital and largest city in Georgia. It is located in Fulton County and part of it extends into DeKalb County. Although its population of 498,715 makes it the eighth most populous city in the Southeast, the larger Atlanta metropolitan area is home to over 6.2 million people, making it the eighth-largest metro area in the United States. Atlanta is known for its unique topography with rolling hills, abundant greenery, and the densest urban tree coverage in the country.

Miami: Miami is a coastal metropolis and the seat of Miami-Dade County in South Florida. It is the second-most populous city in Florida with a population of 442,241. Miami has a large metropolitan area with a population of 6.14 million, making it the second-largest in the Southeast and ninth-largest in the US. It boasts a prominent skyline, including over 300 high-rises, with 58 exceeding 491 ft.

New Orleans: New Orleans is a city in southeastern Louisiana along the Mississippi River. It is the most populous city in Louisiana and the French Louisiana region. Known for being a major port, New Orleans serves as an economic and commercial hub for the Gulf Coast region.

Austin, Texas: Austin, Texas is the vibrant capital of Texas, known for its rapid growth and cultural scene. As the 10th most populous city in the US, it extends into multiple counties and is a major state capital. Situated about 80 miles apart, it forms a thriving metropolitan region with San Antonio. Austin is also recognized as a Beta-level global city and has been experiencing significant growth since 2010.

Dallas: Dallas is the most populous city in Texas and the main core of the Dallas-Fort Worth metroplex. It is also the ninth-most populous city in the U.S., with a 2020 census population of 1.3 million. Dallas is located in North Texas and serves as the seat of Dallas County. It is part of the largest metropolitan area in the Southern United States and lacks a navigable link to the sea.

Houston: Houston is a populous city located in Southeast Texas near Galveston Bay and the Gulf of Mexico. It is the largest city in Harris County and the principal city of the Greater Houston metropolitan area. With a population of 2,302,878, it ranks as the fourth-most populous city in the United States and the seventh-most populous city in North America. Houston is an anchor of the Texas Triangle megaregion.

San Antonio: San Antonio, located in Texas, is a major city known for being the county seat of Bexar County. It is the seventh-most populous city in the United States and second-largest in the Southern United States. San Antonio is also the largest city in the San Antonio–New Braunfels metropolitan area, often called Greater San Antonio. The metropolitan area has a population of approximately 2.6 million people, making it the 24th-largest in the US and the third-largest in Texas, according to the 2020 U.S. census estimates.

Cleveland: Cleveland is the largest city on Lake Erie, located in Ohio along its southern shore. It serves as the county seat of Cuyahoga County and anchors the Greater Cleveland metropolitan area. With a population of 372,624, it ranks as the second-most populous city in Ohio and the 54th-most populous city in the U.S. The city is situated approximately 60 miles west of Pennsylvania and shares a maritime border with Canada. The Cleveland area, including Akron and Canton, forms the most populous combined statistical area in Ohio, with a population of 3.63 million in 2020.

Detroit: Detroit is a populous city on the United States–Canada border, serving as the government seat of Wayne County in Michigan. It is the 29th-most populous city in the US, with a population of 639,111 as of 2020. The Metro Detroit area boasts a population of 4.3 million, making it the second-largest in the Midwest and the 14th-largest in the US. Known for its cultural significance, Detroit has made notable contributions to music, art, architecture, and design, while also having a rich automotive history.

Chicago: Chicago is the largest city in Illinois and the third-largest city in the United States. It has a population of over 2.7 million people, making it the most populous city in the Midwest. It is the seat of Cook County, which is the second most populous county in the US. Chicago is also the center of the Chicago metropolitan area.

Minneapolis: Minneapolis, the largest city in Minnesota, is known as the "City of Lakes" due to its abundance of water features, including thirteen lakes, wetlands, the Mississippi River, creeks, and waterfalls. It was once the global leader in lumber and flour milling during the 19th century. Today, Minneapolis remains a financially influential city, occupying both banks of the Mississippi River and neighboring the state capital, Saint Paul.

St. Louis: St. Louis is an independent city in Missouri, situated near the convergence of the Mississippi and Missouri rivers. In 2020, the city had a population of 301,578, while its metropolitan area spanned into Illinois with over 2.8 million people. It is Missouri's largest metropolitan area and the second largest in Illinois. Additionally, St. Louis' combined statistical area ranks as the 21st largest in the United States.

Denver: Denver is the capital and largest city of Colorado, with a population of 715,522 in 2020. It is the 19th-most populous city in the United States and the fifth most populous state capital. It is also part of the Denver–Aurora–Lakewood metropolitan statistical area, the most populous in Colorado.

Phoenix, Arizona: Phoenix, AZ is Arizona's capital and largest city, with 1.6 million residents. It is the fifth-most populous city in the US and the country's most populous state capital.

Las Vegas: Las Vegas, also known as Vegas, is a bustling city in Nevada, USA. It is the most populous city in the state and the county seat of Clark County. As the 25th-most populous city in the country, it boasts the largest metropolitan area in the Mojave Desert and the second-largest in the Southwest. Famous for its gambling, shopping, fine dining, entertainment, and vibrant nightlife, it is a renowned international resort city. With its downtown and the iconic Las Vegas Strip, it offers a wide range of venues for visitors. Additionally, Las Vegas Valley serves as a vital center for finance, commerce, and culture in Nevada.

Los Angeles: Los Angeles, often abbreviated as L.A., is the largest city in California and the second-most populous city in the United States after New York City. It serves as the commercial, financial, and cultural hub of Southern California. With a population of approximately 3.9 million, it boasts a diverse population and a Mediterranean climate. Los Angeles also acts as the principal city in a vast metropolitan area.

San Diego: San Diego is a populous city in California, located by the Pacific Ocean. It is the eighth most populous city in the US and second in California after Los Angeles. The city is adjacent to the Mexico-United States border and serves as the seat of San Diego County. San Diego boasts a mild Mediterranean climate, beautiful beaches, and parks. It is famous for its strong connection with the US Navy and recent growth in healthcare and biotechnology.

San Francisco: San Francisco, officially the City and County of San Francisco, is a vibrant and bustling city that serves as the commercial, financial, and cultural hub of Northern California. It is the fourth most populous city in California and the 17th most populous city in the United States. Situated at the end of the San Francisco Peninsula, it covers a land area of 46.9 square miles. Known for its dense population, it is the second-most densely populated large city in the US after New York City. San Francisco is renowned for its prosperity, ranking first in per capita income and sixth in aggregate income among US cities with over 250,000 residents. The city also goes by several colloquial nicknames, including Frisco, San Fran, The City, and SF.

San Jose, California: San Jose, California is the largest city in Northern California and has a population of 971,233. It is the most populous city in the Bay Area and the San Jose–San Francisco–Oakland Combined Statistical Area. Additionally, it is the third-most populous city in California and the 12th-most populous city in the United States. San Jose is located in the Santa Clara Valley on the southern shore of San Francisco Bay and covers an area of 179.97 sq mi. It serves as the county seat of Santa Clara County and is a major component of the San Jose–Sunnyvale–Santa Clara Metropolitan Statistical Area, home to around two million residents.

Seattle: Seattle is a major port city in the US, located on the West Coast. It is the largest city in both Washington state and the Pacific Northwest region, with a population of 749,256. The Seattle metropolitan area has a population of 4.02 million, making it the 15th largest in the country. Between 2010 and 2020, Seattle experienced rapid growth, becoming one of the fastest-growing large cities in the US.

Mexico City: Mexico City is the capital and largest city of Mexico. It is a major global cultural and financial hub located in the Valley of Mexico, at a high altitude of 2,240 meters. With 16 boroughs, it is home to numerous neighborhoods.

Tijuana: Tijuana, located on Mexico's Pacific Coast, is the largest city in Baja California. It serves as the municipal seat of the Tijuana Municipality and is the key hub of the Tijuana metropolitan area. With its close proximity to the Mexico-US border, Tijuana is an integral part of the San Diego-Tijuana metro region.

Puebla (city): Puebla (city), also known as Heroica Puebla de Zaragoza, is the capital and largest city of the state of Puebla, Mexico. It was built during the viceregal era as a planned city and is located in southern Central Mexico. Puebla is the fourth largest city in Mexico and is situated between Mexico City and Veracruz, serving as a crucial link on the main route between the capital and the Atlantic port.

Guadalajara: Guadalajara is a city in western Mexico and the capital of Jalisco state. It has a population of 1,385,629, making it the 7th largest city in Mexico. The Guadalajara metropolitan area has a population of 5,268,642, making it the third-largest in the country. It is known for its high population density of over 10,361 people per square kilometer. Guadalajara is a major center for business, arts, culture, technology, and tourism. It is the economic hub of the Bajío region and is regularly ranked among the most productive and competitive cities globally. The city boasts several landmarks, including the Guadalajara Cathedral, the Teatro Degollado, the Templo Expiatorio, the Hospicio Cabañas—a UNESCO World Heritage site, and the San Juan de Dios Market, the largest indoor market in Latin America.

Ciudad Juárez: Ciudad Juárez, or Juárez, is the largest city in Chihuahua, Mexico, with a population of 2.5 million people. It was previously called El Paso del Norte until 1888. Situated on the Rio Grande river, it is located south of El Paso, Texas, forming the second largest binational metropolitan area on the Mexico-U.S. border. The combined population of Ciudad Juárez and El Paso is over 3.4 million people.

León, Guanajuato: León, Guanajuato is a populous city in central Mexico. It serves as the municipal seat and is located in the state of Guanajuato. With a population of over 1.7 million people, it is the fourth most populous municipality in the country. The metropolitan area of León has a population of over 2.1 million, making it the seventh most populous metropolitan area in Mexico. Situated in the Bajío macroregion, León is a key city within the Central Mexican Plateau.

Monterrey: Summary: Monterrey is the capital and largest city of Nuevo León, Mexico. It is the second largest city in the country, located at the foothills of the Sierra Madre Oriental. The Monterrey metropolitan area is the second largest and most productive in Mexico, with an estimated population of 5,341,171 people and a GDP of US$140 billion. The city itself has a population of 1,142,194 according to the 2020 census.

Mérida, Yucatán: Mérida, the capital of Yucatán in México, is a bustling city in the southeast. It is situated in the northwest of the Yucatán Peninsula, approximately 35 km from the Gulf of Mexico. With a population of 921,770, it serves as the seat of the eponymous municipality. The metropolitan area, encompassing the cities of Kanasín and Umán, totals 1,316,090 people in 2020.

Acapulco: Acapulco, also known as Acapulco de Juárez, is a major seaport and city located in Guerrero, Mexico. It is situated on a deep bay and has served as a port since the colonial period. Acapulco is a popular destination for shipping and cruise lines traveling between Panama and San Francisco. It is the largest city in Guerrero and the biggest beach resort in Mexico. Acapulco de Juárez is the municipal seat of the Acapulco municipality.

Veracruz (city): Veracruz (city) is a major port on the Gulf of Mexico and the most populous city in the Mexican state of Veracruz. Located along the state's central coast, it is the municipal seat and is known as Heroica Veracruz. The city is situated 90 km southeast of the state capital, Xalapa.

San José, Costa Rica: San José is the capital and largest city of Costa Rica, situated in the center of the country. It serves as the seat of national government and is a hub for political, economic, and transportation activities. With a population of over 333,980 residents in 2015, it is a significant city within the Greater Metropolitan Area, which has an estimated population of over 2 million. The city is named after Joseph of Nazareth.

San Salvador: San Salvador is the capital and largest city of El Salvador. It is the political, cultural, and financial hub of the country. The metropolitan area, including the capital and 13 municipalities, has a population of 2,404,097. The urban area alone is home to 1,600,000 inhabitants.

Guatemala City: Guatemala City, locally known as Guate, is the capital and largest city of Guatemala. It is located in a mountain valley called Valle de la Ermita and serves as the capital of the Guatemala Department. Being the most populous urban area in Central America, it is a significant cultural and economic hub in the region.

Tegucigalpa: Tegucigalpa, the capital and largest city of Honduras, is known as Tegus or Teguz. It is situated alongside its sister city, Comayagüela.

Managua: Managua is Nicaragua's capital, situated on Lake Managua. It has a population of 1,055,247 and is one of the largest cities in Central America. Additionally, it serves as the seat of Managua Department.

Panama City: Panama City, the capital and largest city of Panama, has a population of 1.9 million. It is located at the Pacific entrance of the Panama Canal, serving as a hub for banking, commerce, politics, and administration.

Havana: Havana is the capital and largest city of Cuba, serving as the country's main port and commercial center. With a population of over 2 million people, Havana spans an area of 728.26 km2 for the capital city side and 8,475.57 km² for the metropolitan zone, making it the largest city by area and the most populous in the Caribbean region.

Santo Domingo: Santo Domingo, also known as Santo Domingo de Guzmán, is the capital and largest city of the Dominican Republic and the Caribbean's most populous metropolitan area. With a population of over 1 million, it is situated within the Distrito Nacional and shares borders with Santo Domingo Province.

Port-au-Prince: Port-au-Prince is the capital and largest city of Haiti, with a population of approximately 1.2 million. The metropolitan area, which includes several surrounding communes, has a population of about 2.6 million.

Kingston, Jamaica: Kingston, Jamaica: capital and largest city of Jamaica, situated on the southeastern coast with a natural protected harbor. It connects to the rest of the island through a long sand spit called Palisadoes, linking Port Royal and Norman Manley International Airport. Kingston is the Caribbean's largest predominantly English-speaking city.

San Juan, Puerto Rico: San Juan, Puerto Rico is the capital and most populous city in the Commonwealth of Puerto Rico. It is the 57th-largest city in the United States with a population of 342,259. Founded in 1521 by Spanish colonists, it was originally known as Ciudad de Puerto Rico.

Buenos Aires: Buenos Aires is the capital and primate city of Argentina, located on the western shore of the Río de la Plata. Its name means "fair winds" or "good airs" in Spanish. It is considered an Alpha global city, according to GaWC's 2020 ranking.

Córdoba, Argentina: Córdoba, Argentina is a city in central Argentina, known for its location in the foothills of the Sierras Chicas on the Suquía River. It is the capital of Córdoba Province and the second-most populous city in Argentina, with about 1.6 million urban inhabitants. Founded in 1573 by Jerónimo Luis de Cabrera, it was an early Spanish colonial capital and has a rich history. The city is home to the National University of Córdoba, the oldest university in the country, and is known as "La Docta."

Rosario: Rosario is the largest city in the Santa Fe province of Argentina, located on the Paraná River. It is the country's third most populous city and boasts a metropolitan area estimated to be home to 1.75 million people. The city is known for its impressive preservation of neoclassical, Art Nouveau, and Art Deco architecture found in numerous residences, houses, and public buildings.

La Paz: La Paz is the de facto capital of Bolivia and the seat of government. With a population of over 816,000, it is the third-most populous city in the country. The metropolitan area, which includes La Paz and nearby towns, has a population of 2.2 million, making it the second most populous urban area in Bolivia. La Paz is also the capital of the La Paz Department.

Santa Cruz de la Sierra: Santa Cruz de la Sierra, also known as Santa Cruz, is Bolivia's largest city and acts as the capital of the Santa Cruz department.

Belém: Belém, also known as Belém of Pará, is a bustling Brazilian city and the capital of the state of Pará. Located in the northern part of the country, it serves as the gateway to the Amazon River. With a thriving port, airport, and bus station, Belém is strategically positioned approximately 100 km upriver from the Atlantic Ocean on the Pará River. This river is part of the vast Amazon River system, separated from the main Amazon delta by Ilha de Marajó. Home to an estimated population of 1,499,641 people (or 2,491,052 including the metropolitan area), Belém is the 11th most populous city in Brazil and the second largest in the North Region, only surpassed by Manaus in the state of Amazonas.

Belo Horizonte: Belo Horizonte is Brazil's sixth-largest city, with a population of 2.3 million and a metropolitan area of 6 million. It is the capital of Minas Gerais, the country's second-most populous state. As the first planned modern city in Brazil, it is ranked as the third most populous metropolitan area in the country.

Brasília: Brasília is the capital of Brazil, situated in the Central-West region. It was established in 1960 by President Juscelino Kubitschek as the country's new national capital. With a high GDP per capita, it ranks as one of the major cities in Latin America.

Curitiba: Curitiba is a major city in Southern Brazil, serving as the capital of Paraná state. With a population of 1.96 million, it ranks as the eighth largest city in Brazil and the largest in the South Region. Curitiba's metropolitan area includes 29 municipalities and has a total population surpassing 3.73 million, making it the ninth most populous in the country.

Fortaleza: Fortaleza is the capital of Ceará in Northeastern Brazil. It is the country's 4th largest city, with a population of over 2.7 million, and ranks 12th in gross domestic product. The city is the center of the Fortaleza metropolitan area, home to over 4.1 million people.

Manaus: Manaus is the capital and largest city of the Brazilian state of Amazonas, situated near the junction of the Negro and Amazon rivers. With a population of over 2.2 million, it is the seventh-largest city in Brazil. Manaus is known for being the largest metropolitan area in the North Region and one of two cities in the Amazon Rainforest with a population exceeding 1 million.

Porto Alegre: Porto Alegre is the capital of Rio Grande do Sul, Brazil, with a population of 1.5 million people. It is the southernmost capital in Brazil and serves as the center of the fifth-largest metropolitan area in the country, with over 4.4 million residents.

Recife: Recife is the largest city in northeastern Brazil and the capital of Pernambuco state. With a population of over 4 million, it is known for its historical significance and vibrant culture. Founded in 1537, Recife was a major harbor during the Portuguese colonization and later became the capital of Dutch Brazil. Situated at the confluence of the Beberibe and Capibaribe rivers, Recife is often called the "Brazilian Venice" due to its many rivers, islands, and bridges. It is also a significant port on the Atlantic. Recife's name refers to the stone reefs along its shores. The city boasts a high Human Development Index (HDI) and is recognized as one of the most developed capitals in the region.

Rio de Janeiro: Rio de Janeiro, or simply Rio, is the capital of the state of Rio de Janeiro and the second-most-populous city in Brazil and the sixth-most-populous city in the Americas. It is considered a beta global city by the GaWC. Additionally, Rio de Janeiro is home to a designated World Heritage Site.

Salvador, Bahia: Salvador is the capital of Bahia, Brazil, known for its cuisine, music, and architecture. It boasts a significant Afro-Brazilian cultural influence and is one of the oldest cities in the Americas. Founded in 1549, Salvador was the first capital of Colonial Brazil and a planned city during the Renaissance. Its establishment was a result of the Portuguese Empire's implementation of the General Government of Brazil.

São Luís, Maranhão: São Luís, Maranhão, is the capital and largest city of Maranhão state in Brazil. It is situated on Upaon-açu Island in the Baía de São Marcos, an estuary formed by several rivers. With a population of 1,108,975 people, São Luís has the second largest maritime extension in Brazil, spanning 640 km. The metropolitan area is ranked as the 15th largest in the country, with a total population of 1,605,305.

São Paulo: São Paulo is Brazil's largest city and the capital of the state of São Paulo. It is an alpha global city, exerting strong international influences in commerce, finance, arts, and entertainment. As the most populous city outside of Asia, it is also the world's fourth-largest city. The metropolitan area, Greater São Paulo, is Brazil's most populous and the 12th most populous globally. With over 30 million inhabitants, it forms the São Paulo Macrometropolis, one of the world's most populous urban agglomerations. Additionally, São Paulo is the largest Portuguese-speaking city and its name honors the Apostle Saint Paul of Tarsus.

Santiago: Santiago, also known as Santiago de Chile, is the capital and largest city of Chile, located in the central valley. It is the center of the Santiago Metropolitan Region, home to 7 million people, representing 40% of Chile's total population. The city is mostly situated between 500–650 m (1,640–2,133 ft) above sea level.

Valparaíso: Valparaíso is a significant city and seaport in the Valparaíso Region of Chile. It serves as a naval base and educational hub.

Barranquilla: Barranquilla is the capital district of Atlántico, Colombia, near the Caribbean Sea. It is the largest city and third port in the Caribbean coast region, with a population of 1,206,319 in 2018.

Bogotá: Bogotá, the capital city of Colombia, is one of the largest cities globally. It is administered as the Capital District and is the center for politics, economics, administration, industry, culture, healthcare, education, and technology in the country and northern South America. Despite being part of the department of Cundinamarca, Bogotá has the same administrative status as a department. The city was formerly known as Santa Fe de Bogotá during the Spanish Colonial period and between 1991 and 2000.

Cali: Cali, also known as Santiago de Cali, is the capital of Colombia's Valle del Cauca department. It is the largest city in southwest Colombia, with a population of 2,227,642 residents. Cali covers an area of 560.3 km2, making it the second-largest city in the country by area. With access to the Pacific Coast, it serves as a major urban and economic center in the south of Colombia. The city, founded in 1536, has a rapidly growing economy and is one of the country's most populous cities after Bogotá and Medellín.

Cartagena, Colombia: Cartagena, Colombia, also known as Cartagena de Indias, is a historic city and major port on Colombia's northern coast, situated along the Caribbean Sea. With a rich historical background as a trade hub and Spanish colony, Cartagena played a significant role in the export of Bolivian silver and the import of enslaved Africans. Its strategic location and strong defenses protected it from pirate attacks. Additionally, the city's proximity to the Magdalena and Sinú Rivers allowed for easy access to the interior of New Granada, making it a crucial trading port between Spain and its overseas empire.

Medellín: Medellín is Colombia's second-largest city and the capital of Antioquia. It is situated in the Aburrá Valley in the Andes Mountains of South America. With a population of 2,508,452, Medellín is a vibrant urban hub. It also serves as the center for a metro area with over 4 million inhabitants, making it a significant economic and demographic hub in Colombia.

Guayaquil: Guayaquil is Ecuador's biggest city and serves as the nation's economic capital and primary port. It is located on the west bank of the Guayas River, which leads into the Pacific Ocean at the Gulf of Guayaquil. Guayaquil also functions as the capital of Guayas Province and the seat of Guayaquil Canton.

Quito: Quito is the capital of Ecuador and the province of Pichincha. It has a population of 2.8 million and is situated in a valley on the eastern slopes of the active Pichincha volcano in the Andes.

Asunción: Asunción is the capital and largest city of Paraguay, located on the eastern bank of the Paraguay River. It is separated from Argentina by the Paraguay River and Bay of Asunción, and is surrounded by the Central Department.

Lima: Lima, the capital of Peru, is a thriving city located in the desert zone of the central coast, with stunning views of the Pacific Ocean. As a major political, cultural, financial, and commercial center, it holds great significance for Peru. Lima is classified as a "beta" tier city due to its geostrategic importance. The city's jurisdiction primarily falls within the province of Lima, with a smaller portion extending into the Constitutional Province of Callao. The latter is home to the seaport and Jorge Chávez Airport. Since 2002, both provinces have regional autonomy.

Arequipa: Arequipa, the legal capital of Peru, is a city in Peru and the second most populous after Lima. It is home to the Constitutional Court and has an urban population of 1,296,278 inhabitants.

Cusco: Cusco, or Cuzco, is a city in southeastern Peru that serves as the capital of the Cusco Region and Cusco Province. It sits in the Andes mountains and is known for its high altitude of 3,400 m (11,200 ft). With a population of 428,450, it is the seventh most populous city in Peru.

Montevideo: Montevideo is Uruguay's capital and largest city with a population of 1,319,108. It is located on the southern coast, on the northeastern bank of the Río de la Plata.

Caracas: Caracas is the capital and largest city of Venezuela, situated along the Guaire River in the northern part of the country. It is located in the Caracas Valley, near the Caribbean Sea, and is separated from the coast by the Cerro El Ávila mountain range. With a population of nearly 5 million, it serves as the center of the Metropolitan Region of Caracas.

Maracaibo: Maracaibo is a major city in northwestern Venezuela, located on the shore of a strait connecting Lake Maracaibo to the Gulf of Venezuela. It is the second-largest city in Venezuela and the capital of the state of Zulia. With a population of approximately 2.7 million inhabitants, Maracaibo is known as "The Beloved Land of the Sun."

Valencia, Venezuela: Valencia, Venezuela, the capital of Carabobo State, is the country's third-largest city.

Almaty: Almaty, formally Alma-Ata, is Kazakhstan's biggest city with a population exceeding two million. It served as the capital from 1929 to 1991, during its time as an autonomous republic and later as a union republic within the Soviet Union. The government relocated the capital to Akmola in 1997.

Astana: Astana (now Nur-Sultan) is the capital city of Kazakhstan, known by various names throughout history, including Akmolinsk, Tselinograd, and Akmola.

Samarkand: Samarkand, an ancient city in southeastern Uzbekistan, is one of the oldest inhabited cities in Central Asia. It serves as the capital of Samarqand Region and includes urban-type settlements. With a population of 551,700, it is the second-largest city in Uzbekistan.

Tashkent: Tashkent, also known as Toshkent, is the capital of Uzbekistan and the largest city in Central Asia, with a population of 3 million. It is situated in northeastern Uzbekistan, close to the Kazakhstan border.

Shijiazhuang: Shijiazhuang is the capital city of Hebei Province in China. Situated about 266 kilometres southwest of Beijing, it is a prominent urban center. The city governs eight districts, two county-level cities, and twelve counties.

Taiyuan: Taiyuan is the capital and largest city of Shanxi Province, China. It serves as the political, economic, cultural, and international exchange hub for the region. Known as Lóngchéng, it has historically been a capital or provisional capital for various dynasties. Taiyuan is an industrial center, particularly specializing in energy and heavy chemicals.

Beijing: Beijing, also known as Peking, is the capital of China and the most populous national capital in the world. With over 21 million residents, it is the second largest city in China after Shanghai. Located in Northern China, Beijing is a municipality with 16 districts. It is surrounded by Hebei Province, except for the neighboring city of Tianjin to the southeast. Together, they form the Jingjinji megalopolis and the national capital region of China.

Tianjin: Tianjin is a coastal metropolis in Northern China, not part of a province. It is a national central city with a population of 13.9 million. The built-up area has 12 central districts and a population of 11.2 million, making it the 29th-largest agglomeration and 11th-most populous city in the world.

Dalian: Dalian is a major port city in northeastern China, located on the southern tip of the Liaodong peninsula. It is the second largest city in Liaoning province and the third-most populous city in Northeast China. Dalian shares borders with Yingkou, Anshan, and Dandong, and has maritime boundaries with Qinhuangdao, Huludao, Yantai, Weihai, and North Korea.

Shenyang: Shenyang, also known as Fengtian or Mukden, is a major city and provincial capital in Liaoning, China. With a population of over 9 million, it is the largest and most populous city in Northeast China.

Harbin: Harbin is a major city in northeast China and serves as the capital of the Heilongjiang province. It is the largest city in this region and is known for its significant urban and metropolitan populations. Harbin has authority over nine districts, two county-level cities, and seven counties. With a population of over 5.8 million in the city and more than 10 million in the metro area, it ranks among the top 100 largest urban areas globally.

Changchun: Changchun is the capital and largest city of Jilin Province in China, situated in the center of the Songliao Plain. With a population of over 9 million, it is a significant sub-provincial city consisting of 7 districts, 1 county, and 3 county-level cities. Changchun is a major city in Northeast China, and its metro area has a population of 5 million.

Jinan: Jinan, also known as Tsinan, is the capital of Shandong province in Eastern China. It is the second-largest city in Shandong with a population of 9.2 million. Jinan has a rich historical significance and serves as a major national administrative, economic, and transportation hub. It has been referred to as the "City of Springs" due to its renowned 72 artesian springs.

Qingdao: Qingdao, located in eastern Shandong Province on the Yellow Sea coast, is a major city connecting Continental and East Asia with Europe through the Belt and Road Initiative. As a sub-provincial level city, it enjoys the highest GDP in the province. Inhabited by 7,172,451 people, it is the 15th largest city in China. Qingdao shares borders with Yantai, Weifang, and Rizhao, and overlooks the Yellow Sea from the Shandong Peninsula.

Nanjing: Nanjing, or Nanking, is the capital of Jiangsu province in China. It is a megacity with 11 districts, covering 6,600 km2 (2,500 sq mi) and having a population of 9,423,400 as of 2021. With a rich history as a former capital, Nanjing is a center for culture, education, research, and politics. It is known for its large inland port and is ranked as one of the world's top 100 cities in the Global Financial Centres Index. Nanjing enjoys jurisdictional and economic autonomy similar to a province, making it a significant city in China's administrative structure.

Suzhou: Suzhou, also known as Soochow, is a vital economic hub located in southern Jiangsu province, East China. It holds the title of being the most populous city in Jiangsu and serves as a significant center for trade, commerce, and economic activities.

Hefei: Hefei is the capital and largest city of Anhui Province, China. It serves as the political, economic, and cultural hub of the region, with a population of over 9 million people. Situated in central China, Hefei is well-connected and borders several cities. It is notable for its location near Chao Lake and the Dabie Mountains, which act as a natural divide between the Huai and Yangtze rivers.

Hangzhou: Located in Zhejiang, China, Hangzhou is a prominent city at the head of Hangzhou Bay. It gained significance as the ending point of the Grand Canal and has been prosperous for centuries. As a major economic hub and the second biggest city in the Yangtze Delta, Hangzhou plays a crucial role in China's economy. With a population of over 11 million people, it forms the core of the fourth-largest metropolitan area in China. The thriving Hangzhou metropolitan area has a larger economy than Nigeria and encompasses urban districts in both Hangzhou and Shaoxing.

Nanchang: Nanchang is the capital of Jiangxi Province in China. It is strategically located in the north-central region, between the Jiuling Mountains and Poyang Lake. As a railway hub, it connects the prosperous East and South China.

Fuzhou: Fuzhou (or Foochow) is a major city in Fujian, China, situated between the Min River estuary and Ningde. It serves as the capital of Fujian and is part of the Mindong linguistic and cultural region, along with Ningde.

Xiamen: Xiamen, also known as Amoy, is a sub-provincial city in southeastern Fujian, China, located beside the Taiwan Strait. It consists of six districts covering an area of 1,700.61 square kilometers with a population of 5.3 million. The city has undergone urbanization, spreading from its original island to encompass Zhangzhou districts, forming a metropolis of almost 10 million people. Xiamen played a significant role in China's Opening Up Policy, becoming one of the country's first special economic zones in the 1980s.

Shanghai: Shanghai is a major city in China, known as one of the four direct-administered municipalities. It is situated at the mouth of the Yangtze River, with the Huangpu River flowing through it. With a population of 24.89 million in the city proper and 39.3 million in the urban area, it ranks among the most populous cities in the world. Shanghai is a prominent hub for finance, business, research, science, manufacturing, transportation, tourism, and culture. It boasts the world's busiest container port, and its Greater Shanghai metropolitan area generates a substantial gross metropolitan product of around 9.1 trillion RMB.

Guangzhou: Guangzhou, aka Canton, is the capital of Guangdong province in southern China. Positioned on the Pearl River, it has a rich history spanning over 2,200 years. This city, located 120 km north of Hong Kong and 145 km north of Macau, served as an important stop along the Silk Road.

Shantou: Shantou, also called Swatow or Santow, is a major city in the Guangdong province of China. It has a population of 5.5 million and covers an area of 2,248 square kilometers. The city's built-up area is even larger, with over 12.5 million people, including neighboring districts, counties, and cities. Shantou is considered the fifth largest built-up area in mainland China, alongside other prominent cities like Hangzhou-Shaoxing, Xian-Xianyang, and Tianjin.

Shenzhen: Shenzhen is a major Chinese city located in Guangdong province, bordering Hong Kong. It is a global hub for technology, research, manufacturing, business, and finance. With a population of 17.56 million, it ranks as the third most populous city in China. Additionally, Shenzhen is known for its bustling Port, which is the world's fourth busiest container port.

Luoyang: Luoyang is a city in Henan province, situated at the confluence area of the Luo River and the Yellow River. It borders Zhengzhou to the east and has a population of 6.9 million. The city has jurisdiction over 7 municipal districts, 7 counties, and 1 development zone.

Zhengzhou: Zhengzhou is the capital and largest city of Henan Province in China. It serves as the political, economic, technological, and educational center of the province and is one of the National Central Cities in China. Zhengzhou is located in north-central Henan and is the core area of the Central Plains Economic Zone.

Changsha: Changsha is the capital and largest city of Hunan Province, China. It is the 17th most populous city in the country and the third-most populous city in Central China. Located on the Xiang River, it is known for its scenic beauty with Mount Yuelu and Orange Isle. Changsha is part of the Greater Changsha Metropolitan Region and was named one of the emerging mega-cities in China. It is a major transportation hub and has historical and cultural significance. The city has a diverse linguistic landscape, with Changshanese, Ningxiangnese, and Liuyangnese dialects spoken in different areas. As of 2020, Changsha had a population of over 10 million.

Wuhan: Wuhan is the capital of Hubei Province in China, with a population of over eleven million. It is the most populous city in Hubei and one of the nine national central cities.

Nanning: Nanning is the capital of Guangxi in Southern China, renowned as the "Green City" due to its abundant subtropical greenery. It is a hilly basin surrounded by lush foliage and experiences a warm, monsoon-influenced humid subtropical climate.

Hong Kong: Hong Kong is a highly populated city and special administrative region in China with 7.4 million residents from different nationalities. It covers a small territory of 1,104 square kilometers and is known for its dense population.

Macau: Macau, officially known as the Macao Special Administrative Region (MSAR) of China, is a densely populated city located in the western Pearl River Delta by the South China Sea. It has a population of around 680,000 and covers an area of 32.9 sq km (12.7 sq mi).

Chengdu: Chengdu is the capital city of Sichuan province in China, known for its high population of over 20 million people. It serves as the main hub of Western China and is one of the nine national central cities in the country.

Kunming: Kunming, or Yunnan-Fu, is the capital and largest city of Yunnan province, China. It serves as the political, economic, communications, and cultural center of the region. Noteworthy for its role in World War II, it was a vital Chinese military hub, American air base, and terminus for the Burma Road. Positioned on the Yunnan-Guizhou Plateau, Kunming is situated at an elevation of 1,900 meters and just north of the Tropic of Cancer. As the fourth most populous city in Western China, and the third in southwestern China, Kunming is home to a population exceeding 8.4 million people. The city offers a picturesque setting, nestled alongside Dian Lake and featuring a combination of temples and scenic lake-and-limestone hill landscapes.

Chongqing: Chongqing is a significant city in China, situated along the Yangtze River Economic Belt. It also serves as a base for China's Belt and Road Initiative.

Lhasa: Lhasa is the capital of Tibet Autonomous Region in southwest China, serving as the administrative center. It encompasses the Chengguan District, which forms the main urban area of Lhasa City.

Xi'an: Xi'an is the bustling capital of Shaanxi Province in Northwest China, with a population of 12.9 million. Situated on the Guanzhong Plain, it ranks as the third most populous city in Western China, following Chongqing and Chengdu. The urban area is home to 9.28 million people.

Ürümqi: Ürümqi is the capital of the Xinjiang Uyghur Autonomous Region in China's far northwest. It was previously called Dihua.

Lanzhou: Lanzhou is the capital of Gansu province in China, situated on the Yellow River. It serves as a pivotal transportation hub, connecting the west and east of the country. With a historical significance as a key stop on the Northern Silk Road, Lanzhou is poised to become a major hub on the New Eurasian Land Bridge. It also boasts a thriving heavy industry and petrochemical sector.

Nagoya: Nagoya is Japan's fourth-largest city and the capital of Aichi Prefecture. It is located on the Pacific coast in central Honshu and serves as a major port. With a population of 2.3 million, Nagoya is one of Japan's three major cities. It is also part of the Chūkyō metropolitan area, which has a population of 10.11 million.

Hiroshima: Hiroshima is a major city in Japan's Hiroshima Prefecture, with an estimated population of 1.2 million. It has a significant economic impact, with a GDP of $61.3 billion in 2010. The city is led by Mayor Kazumi Matsui since April 2011. Hiroshima is the second largest urban area in the Chugoku region, after Okayama.

Sapporo: Sapporo is the largest city in Hokkaido, Japan's northernmost main island. It serves as the capital city of Hokkaido Prefecture and Ishikari Subprefecture. With a population ranking it fifth in Japan, Sapporo is recognized as a cultural, economic, and political hub. Situated in the southwest of Hokkaido, it lies within the alluvial fan of the Toyohira River, which is a tributary stream of the Ishikari.

Kobe: Kobe, the capital city of Hyōgo Prefecture in Japan, is the country's seventh-largest city and the third-largest port city. With a population of about 1.5 million, it is situated in the Kansai region on the north shore of Osaka Bay. Kobe is part of the Keihanshin metropolitan area, along with Osaka and Kyoto. The city center is located approximately 35 km west of Osaka and 70 km southwest of Kyoto.

Kyoto: Kyoto is the capital city of Kyoto Prefecture in Japan, located in the Kansai region. It is part of the Keihanshin metropolitan area, along with Osaka and Kobe. With a population of 1.46 million, it is the ninth-most populous city in Japan. Kyoto is known for its rich cultural heritage and is the anchor of the Greater Kyoto metropolitan area, home to an estimated 3.8 million people.

Osaka: Osaka is a major city in Japan, located in the Kansai region. It is the capital of Osaka Prefecture and the third most populous city in Japan. With a population of 2.7 million, it is the largest part of the Keihanshin Metropolitan Area. This metropolitan area is the second largest in Japan and the 10th largest internationally, with over 19 million inhabitants.

Tokyo: Tokyo is the capital of Japan and the most populous city worldwide, with over 14 million residents. It is part of the Tokyo metropolitan area, the world's most populous metropolitan area, with 40.8 million residents. The city also boasts the second-largest metropolitan economy globally, estimated at US$2 trillion in 2023.

Yokohama: Yokohama is a major city in Japan, ranking as the second-largest by population. It serves as the capital of Kanagawa Prefecture and is located south of Tokyo on Tokyo Bay. With a population of 3.8 million in 2020, it is a significant economic, cultural, and commercial center, playing a vital role in the Greater Tokyo Area.

Fukuoka: Fukuoka is the sixth-largest city in Japan, located along Hakata Bay. It serves as a major port city and the capital of Fukuoka Prefecture. Known as the gateway to Japan, it has been an important center of international commerce since ancient times. With a rich history dating back to the Jomon period, Fukuoka developed a unique local culture and dialect due to its distance from Kyoto, Osaka, and Tokyo.

Sendai: Sendai is the capital city of Miyagi Prefecture in Japan and is the largest city in the Tōhoku region. It has a population of over 1 million people and is known as one of Japan's designated cities. The city was founded in 1600 by Date Masamune and is famous for its beautiful Japanese zelkova trees that line the main streets. Sendai hosts the largest Tanabata festival in Japan during the summer and the Pageant of Starlight during winter. It is also home to Tohoku University, a renowned institution. Unfortunately, Sendai faced extensive damage from a devastating earthquake and tsunami in 2011.

Ulaanbaatar: Ulaanbaatar is the capital and largest city of Mongolia, with a population of 1.6 million. It holds the title for being the coldest capital city in the world. Located at an elevation of 1,300 meters in a valley on the Tuul River, the city was established in 1639 and became settled permanently in 1778 after multiple relocations. It began as a nomadic Buddhist monastic center.

Pyongyang: Pyongyang is the capital and largest city of North Korea, known as the "Capital of the Revolution." It is situated on the Taedong River, 109 km upstream from its mouth on the Yellow Sea. With a population of 3,255,288 according to the 2008 census, it is a directly administered city with a status equal to North Korean provinces.

Busan: Busan, officially Busan Metropolitan City, is South Korea's second most populous city and the economic, cultural, and educational hub of southeastern South Korea. With a population of over 3.4 million, it is home to South Korea's busiest port and the sixth-busiest in the world. The surrounding area is the largest industrial zone in the country, and Busan is classified as a Large-Port metropolis according to the Southampton System of Port-City classification.

Daegu: Daegu, formerly Taegu, is a major city in southeastern South Korea. It is officially known as Daegu Metropolitan City.

Daejeon: Daejeon is the fifth-largest metropolis in South Korea with a population of 1.5 million. It is known for its technology and research institutions and is located in a central lowland valley with forested hills and the Geum River. The city celebrates its natural environment with mountains, hot springs, and rivers open for public use. Daejeon serves as a transportation hub with major rail and road routes, and is approximately 50 minutes from Seoul by high-speed rail.

Gwangju: Gwangju is the sixth-largest metropolis in South Korea and a designated metropolitan city. It was previously the capital of South Jeolla Province until it became independent and gained metropolitan status.

Incheon: Incheon, formerly Jemulpo or Chemulp'o, is a city in northwest South Korea, bordering Seoul and Gyeonggi. It became an international port in 1883 and is now the country's third-most-populous city with about 3 million inhabitants.

Seoul: Seoul is the capital of South Korea and its largest urban center. It is officially known as Seoul Special City. With the inclusion of Gyeonggi province and Incheon metropolitan city, it forms the Seoul Capital Area, the fourth largest metropolitan economy in the world. Seoul is home to more than half of South Korea's population, which stands at around 9.97 million as of 2020. Additionally, it serves as the seat of the South Korean government.

Kaohsiung: Kaohsiung is a special municipality in southern Taiwan, encompassing an area of 2,952 km2. With a population of around 2.73 million people, it is the third most populous city in Taiwan and the largest in the south.

Taichung: Taichung City, a special municipality in central Taiwan, is the country's second largest city with around 2.85 million residents. It is also the most populous city in Central Taiwan and serves as the core of the Taichung–Changhua metropolitan area, Taiwan's second largest metropolitan area.

Taipei: Taipei is the capital and special municipality of Taiwan, located in Northern Taiwan. It is an enclave of New Taipei City, about 25 km southwest of Keelung. The city is mainly situated on the Taipei Basin, an ancient lakebed, with the Keelung and Xindian rivers forming its western border as they converge to form the Tamsui River.

Herat: Herat is an oasis city in Afghanistan, the third-largest in the country. It has a population of approximately 574,276 and is the capital of Herat Province. Situated in the fertile valley of the Hari River, it is a regional hub in the western part of Afghanistan. It was an ancient civilization on the Silk Road, connecting West, Central, and South Asia.

Kabul: Kabul is the capital and largest city of Afghanistan, located in the eastern half of the country. It has a population of around 4.95 million people and is divided into 22 municipal districts. As Afghanistan's political, cultural, and economical center, Kabul has experienced rapid urbanization and is now the 75th-largest city globally. It serves as the country's primate city.

Kandahar: Kandahar, the second largest city in Afghanistan, is situated in the south on the Arghandab River. It serves as the capital of Kandahar Province and the cultural region called Loy Kandahar. With a population of around 614,118, Kandahar holds significant religious and political importance, being the founding city and spiritual center of the Taliban. It is considered the de facto capital of Afghanistan as the supreme leader and spiritual advisers operate from there, despite Kabul being the official capital.

Chittagong: Chittagong, officially Chattogram, is the second-largest city in Bangladesh and the third largest in the Bengal region. It serves as the administrative capital of its division and district. Located on the banks of the Karnaphuli River, it boasts the busiest seaport on the Bay of Bengal. With a population of over 5.2 million in the Greater Chittagong Area, it is a thriving city experiencing continuous growth and advancement.

Dhaka: Dhaka, formerly Dacca, is the capital and largest city of Bangladesh. It is the ninth-largest and seventh-most densely populated city globally, with a population of 10.2 million residents, which increases to over 22.4 million in the Dhaka Metropolitan Area. Considered the most densely populated urban area in the world, Dhaka is a vital cultural, economic, and scientific hub in Eastern South Asia. It is also the largest Bengali-speaking city globally and ranks 39th in the world for its GDP. Situated on the Ganges Delta, Dhaka is surrounded by the Buriganga, Turag, Dhaleshwari, and Shitalakshya rivers. Moreover, Dhaka holds significance as a major Muslim-majority city.

Sylhet: Sylhet, a metropolis in northeastern Bangladesh, serves as the administrative hub of Sylhet Division. Situated along the Surma River, it houses about 700,000 residents, ranking as the country's fifth-largest city.

Srinagar: Srinagar is the largest city and summer capital of the Indian-administered Jammu and Kashmir region in the disputed Kashmir Valley. This picturesque city is situated along the Jhelum River, with beautiful lakes and hills surrounding it. Srinagar is famous for its natural environment, gardens, houseboats, and traditional Kashmiri handicrafts. It is also known for producing dried fruits and is the second-largest metropolitan area in the Himalayas.

Amritsar: Amritsar, also known as Rāmdāspur and Ambarsar, is Punjab's second-largest city. It serves as a significant cultural, transportation, and economic hub in the Majha region. Amritsar is the administrative capital of its district, located 217 km northwest of Chandigarh and 455 km northwest of New Delhi. Situated near the India-Pakistan border, it is 28 km away. It is also 47 km northeast of Lahore, Pakistan.

Ludhiana: Ludhiana, in the Indian state of Punjab, is the most populous and largest city. With a population of approximately 1.6 million, it is densely populated over 310 km2 area. Known as "India's Manchester," it is a significant industrial center in Northern India and the commercial capital of Punjab.

Jaipur: Jaipur, formerly Jeypore, is the capital of Rajasthan in India. With a population of 3.1 million, it is the 10th most populous city in India. Located 268 km from New Delhi, Jaipur is known as the Pink City due to its pink-colored buildings.

Jodhpur: Jodhpur, the second-largest city in Rajasthan, India, was once the capital of the Kingdom of Marwar. It is famous for its beautiful palaces, forts, and temples set in the Thar Desert. Known as the "Blue City," Jodhpur is a popular tourist destination. It serves as the administrative headquarters of the Jodhpur district and division.

Agra: Agra is a populous city situated on the Yamuna river in Uttar Pradesh, India. It is located about 230 km southeast of Delhi and 330 km west of Lucknow. The city has a population of around 1.6 million, making it the fourth-most populous in Uttar Pradesh and the twenty-third most populous in India.

Kanpur: Kanpur, formerly known as Cawnpore, is a large industrial city in Uttar Pradesh, India. Founded in 1207, it was an important commercial and military center during British India. It is the financial capital of Uttar Pradesh and part of the Bundelkhand Industrial Development Authority. Situated on the banks of the Ganges River, Kanpur is a major financial and industrial hub in North India. It is renowned for its colonial architecture, beautiful gardens, and thriving IT parks. Kanpur is also known for producing high-quality leather, plastic, and textile products, which are exported mainly to the West.

Lucknow: Lucknow is the capital and largest city of the Indian state of Uttar Pradesh. With a population of 2.8 million, it is the eleventh most populous city in India. Known for its multiculturalism and historic significance as a center of power in the 18th and 19th centuries, Lucknow is rich in North Indian cultural and artistic heritage. It is also a prominent center of Shia Islam and has influences of Persian, Shiite, Arabic, and British culture. Additionally, Lucknow is an important hub for governance, education, commerce, technology, tourism, and the arts.

Prayagraj: Prayagraj, also known as Allahabad, is a metropolis in Uttar Pradesh, India. It serves as the administrative headquarters of the Prayagraj district and division. The city is the judicial capital with the highest court in the state, the Allahabad High Court. With a population of approximately 1.53 million in 2011, it is the seventh most populous city in Uttar Pradesh and continues to grow rapidly. Prayagraj is ranked as the world's 40th fastest-growing city and is considered the third most liveable urban agglomeration in the state. The most widely spoken language in the city is Hindi.

Varanasi: Varanasi, located in northern India on the Ganges river, is a city steeped in Hindu traditions of pilgrimage, death, and mourning. It also boasts a fusion of Muslim artistry, attracting religious tourists. Situated in Uttar Pradesh, Varanasi lies on the left bank of the river, about 692 kilometers southeast of New Delhi and 320 kilometers southeast of Lucknow. Furthermore, it lies 121 kilometers downstream of Prayagraj, a significant Hindu pilgrimage site where the Yamuna river joins the Ganges.

Chandigarh: Chandigarh is a planned city and union territory in northern India, serving as a shared capital for Punjab and Haryana. It is part of the Chandigarh Capital Region, which includes satellite cities Panchkula and Mohali. Located near the Himalayas, it is 260 km north of New Delhi and 229 km southeast of Amritsar.

Delhi: Delhi is the capital city and a union territory of India. It is home to New Delhi, the national capital. Situated on the banks of the Yamuna river, Delhi shares borders with Uttar Pradesh and Haryana. It became a union territory in 1956 and the National Capital Territory in 1995. Covering an area of 1,484 square kilometers, Delhi has a city population of over 11 million and an NCT population of about 16.8 million according to the 2011 census.

Ahmedabad: Ahmedabad is the largest city in the state of Gujarat, India, with a population of 5.6 million people. It serves as the administrative headquarters of the Ahmedabad district and houses the Gujarat High Court. Located near the Sabarmati River, it is 25 km away from the state capital, Gandhinagar.

Surat: Surat is a city in Gujarat, India, known as a major commercial and economic center in South Gujarat. It was once a large seaport and is located on the banks of the Tapti River. Surat is famous for its diamond and textile industries, with 90% of the world's diamonds being cut and polished there. It is the second largest city in Gujarat and has achieved a Guinness World Record for the largest yoga session gathering.

Vadodara: Vadodara, also known as Baroda, is a prominent city in Gujarat, India. Situated on the Vishwamitri River, it serves as the administrative center of Vadodara district. The city is connected to Delhi and Mumbai by the railway line and National Highway 8. Vadodara derived its name from its plentiful banyan trees. It is recognized as "Sanskari Nagari" and "Kala Nagari," emphasizing its cultural and artistic significance in India.

Mumbai: Mumbai, the capital city of Maharashtra, is a financial powerhouse and the most populous city in India, with around 12.5 million inhabitants. It serves as the hub of the Mumbai Metropolitan Region, home to over 23 million people. Situated on the Konkan coast, Mumbai boasts a strategic location with a natural deep harbour. Recognized as an alpha world city, Mumbai plays a significant role in India's economy and is a bustling metropolis.

Nagpur: Nagpur is Maharashtra's third-largest city, renowned as the "Orange City". It ranks 13th in size among Indian cities and is projected to be one of the world's fastest-growing cities, with an average growth rate of 8.41% from 2019 to 2035. Nagpur is a proposed Smart City in Maharashtra and among India's top ten cities in executing the Smart City Project.

Pune: Pune, formerly known as Poona, is a major city in the state of Maharashtra, Western India. It serves as the administrative headquarters for Pune district and division. With a population of 3.1 million residents within the city and 7.2 million in the metropolitan region, it is the ninth-most populous city in India and the eighth-most populous metropolitan area. Pune is renowned for being a prominent IT, automobile, and manufacturing hub in the country. It is often called the "Oxford of the East" due to its esteemed educational institutions and has been consistently ranked as the most livable city in India.

Visakhapatnam: Visakhapatnam, also known as Vizag or Viśākha, is the largest and most populous city in Andhra Pradesh, India. Situated between the Eastern Ghats and the Bay of Bengal, it is the second-largest city on India's east coast and the fourth-largest in South India. Visakhapatnam is a smart city and serves as the district headquarters. It contributes significantly to India's economy with an estimated output of $43.5 billion, making it the ninth-largest GDP contributor as of 2016.

Bangalore: Bangalore, also known as Bengaluru, is the capital and largest city of Karnataka, India. It is the third most populous city in the country and the 27th largest city in the world. Situated on the Deccan Plateau, at an elevation of over 900 m (3,000 ft), Bangalore enjoys a pleasant climate and is often called India's "Garden City" due to its numerous parks and green spaces. With a population exceeding 8 million and a metropolitan population of around 15 million, it is the most populous city and largest urban agglomeration in South India.

Mysore: Mysore, officially Mysuru, is a populous metropolitan city in southern Karnataka, India. Renowned for its cleanliness, it served as the capital of the Kingdom of Mysore for six centuries until 1947. Mysore is home to the prestigious Wadiyar dynasty and is known for its magnificent palaces, especially the iconic Mysore Palace. The city is regarded as the "City of Palaces," the "Heritage City," and the "Cultural Capital of Karnataka." It is also cherished for its tranquil ambiance, earning it the nickname "Pensioners' Paradise."

Thiruvananthapuram: Thiruvananthapuram (formerly Trivandrum) is the capital of the Indian state of Kerala. It is the most populous city with around 1.68 million people. Situated on the west coast of India, it is a major IT hub contributing 55% of the state's software exports. The city is known for its undulating coastal hills and was described by Mahatma Gandhi as the "Evergreen city of India".

Chennai: Chennai, formerly Madras, is the capital of Tamil Nadu, India's southernmost state. It is located on the Coromandel Coast of the Bay of Bengal. Chennai is the sixth most populous city in India and forms the fourth most populous urban agglomeration. The Greater Chennai Corporation, established in 1866, is the oldest municipal corporation in India and the second oldest in the world, after London.

Coimbatore: Coimbatore, also called Kovai, is a major city in Tamil Nadu, India, situated on the banks of the Noyyal River and surrounded by the Western Ghats. It is the second largest city in Tamil Nadu, with a significant population and ranked 16th largest urban agglomeration in India. Coimbatore is the administrative capital of its district and is governed by the Coimbatore Municipal Corporation, established in 1981.

Madurai: Madurai is a significant city in Tamil Nadu, India, known as the cultural capital and administrative hub of Madurai District. It ranks as the third largest urban agglomeration in Tamil Nadu and the 33rd most populated city in India, as of 2011. Situated on the banks of River Vaigai, Madurai has a rich history spanning over 2500 years and is often called "Thoonga Nagaram" or "the city that never sleeps."

Hyderabad: Hyderabad, the capital and largest city of Telangana, is located on the Deccan Plateau in Southern India. It has hilly terrain, artificial lakes like Hussain Sagar, and an average altitude of 542m. With a population of 6.9 million residents within the city limits and a metropolitan population of 9.7 million, it stands as the fourth-most populous city in India. Furthermore, Hyderabad boasts the fifth-largest urban economy in the country, with an output of US$74 billion.

Patna: Patna, also known as Pataliputra, is the capital and largest city of the state of Bihar in India. With a population of 2.35 million, it is the 19th largest city in the country. Patna is home to the Patna High Court and is a significant pilgrimage site for Buddhists, Hindus, Jains, and Sikhs. It is located on the southern bank of the Ganges River and also intersects with the rivers Sone, Gandak, and Punpun. The city has a total area of 250 square kilometers and is surrounded by important historical and religious centers like Vaishali, Rajgir, Nalanda, Bodh Gaya, and Pawapuri.

Ranchi: Ranchi is the capital of Jharkhand, India and played a pivotal role in the Jharkhand movement. It became the center for demanding a separate state for tribal regions. Eventually, Jharkhand state was formed in 2000 by dividing Bihar divisions. Ranchi is also included in the prestigious Smart Cities Mission by PM Narendra Modi.

Bhubaneswar: Bhubaneswar is the capital and largest city of Odisha, India. It is known as the "Temple City" due to its rich history of 700 temples. Bhubaneswar has become an important education and business hub in recent years.

Kolkata: Kolkata, the capital of West Bengal, India, is situated on the eastern bank of the Hooghly River. It serves as the main financial and commercial hub of eastern and northeastern India. With a population of 4.5 million, it is the seventh largest city in India and part of the Kolkata Metropolitan Region, which has over 15 million residents. Kolkata holds great historical and cultural significance, being considered the de facto cultural capital of India and the second largest Bengali-speaking city globally. Notably, the city boasts the highest number of Nobel laureates among all Indian cities.

Raipur: Raipur is the capital city of Chhattisgarh, India, and the largest city in the state. It serves as the administrative headquarters for the Raipur district and division. Once a part of Madhya Pradesh, it has now developed into a major commercial and industrial center in Central India. Known for its exponential industrial growth, Raipur is ranked as the sixth cleanest city in India and has earned high rankings in ease of living and municipal performance.

Bhopal: Bhopal is the capital city of Madhya Pradesh, India, known for its lakes and greenery. It is the 16th largest city in India, with a rich history as the former capital of Bhopal State until 1947.

Indore: Indore is the largest city in Madhya Pradesh, India, known for being the cleanest in the country. It serves as headquarters for Indore District and Division, and is a prominent educational hub with campuses of IIT and IIM. Located on the southern edge of Malwa Plateau, it has the highest elevation among major cities in Central India. Indore is situated around 190 km west of Bhopal, and is close to Ujjain and Dewas. With a population of nearly 2 million, it is the most densely populated major city in the region, covering 530 square kilometers of land area.

Guwahati: Guwahati is the largest city in Assam and northeastern India. It serves as the capital of Assam and houses the government's seat. Located on the bank of the Brahmaputra River, this rapidly growing city is known as the "gateway to North East India" and boasts both a riverine port and scenic hills.

Kathmandu: Kathmandu, the capital of Nepal, is the largest city in the country, with a population of over 845,000 people. Situated in the Kathmandu Valley at an altitude of 1,400 metres, it is known for its high plateaus. The city is home to 105,649 households and forms an urban agglomeration with a population of around 2.9 million.

Islamabad: Islamabad, the capital city of Pakistan, is a planned city established in 1967. It has a population of over 1.2 million people and is known for being safe, clean, and green. Administered by the Pakistani government, Islamabad replaced Karachi as the nation's official capital. It boasts high standards of living and impressive architecture.

Peshawar: Peshawar is the sixth largest city in Pakistan, with a population of over 1.97 million. It is the capital of Khyber Pakhtunkhwa province and is primarily inhabited by Pashtuns. Located in the historic Valley of Peshawar, it has a recorded history dating back to 539 BCE, making it one of the oldest cities in South Asia. Peshawar was the capital of the Gandhara civilization and remains one of the country's oldest continuously inhabited cities.

Faisalabad: Faisalabad, once called Lyallpur, is the second largest city and industrial hub in Punjab, Pakistan. Positioned in the northeast, it lies amidst the fertile plains of the Ravi and Chenab River. With an estimated population of 3.7 million in 2023, it is a bustling metropolis and one of Pakistan's most affluent and industrialized cities. Additionally, Faisalabad serves as the largest industrial center and second largest city in the wider Punjab region.

Gujranwala: Gujranwala is a city in Pakistan, known as the "City of Wrestlers". It is famous for its food and is the 5th most populous city in the country. Founded in the 18th century, it is relatively modern compared to other ancient cities in the region. Gujranwala served as the capital of the Sukerchakia Misl state and is the birthplace of Maharaja Ranjit Singh, the founder of the Sikh Empire.

Lahore: Lahore, the capital of Punjab in Pakistan, is the second largest city in the country. With a population of over 13 million, it is a major industrial and economic hub. Situated along the River Ravi, Lahore has been a historic capital and cultural center of the wider Punjab region. Known for its social liberalism, progressiveness, and cosmopolitanism, it is among Pakistan's most significant cities.

Multan: Multan, a city in Punjab, Pakistan, sits on the Chenab River. As one of Pakistan's largest urban centers, Multan holds great cultural, religious, and economic importance in Southern Punjab. Renowned for its ancient heritage and historic landmarks, Multan stands as one of Asia's oldest continuously inhabited cities with a rich history dating back millennia. Serving as a former capital and a significant cultural hub of both Punjab and the Indus Valley civilization, Multan's region has been a vibrant center of various civilizations throughout its 5,000-year span.

Rawalpindi: Rawalpindi is a populous city in Punjab, Pakistan, closely located to the capital Islamabad. It is ranked fourth most populous in Pakistan and third in Punjab. The city is known as one of the "twin cities" along with Islamabad due to their close social and economic ties.

Hyderabad, Sindh: Hyderabad, Sindh is the capital city of Hyderabad Division in the Sindh province of Pakistan. It is the second-largest city in Sindh and the fifth largest in Pakistan.

Karachi: Karachi is the capital city of Sindh, Pakistan and ranks as the 12th largest city globally, with a population exceeding 20 million. Situated on the Arabian Sea coast, it was previously the capital of Pakistan. Known as a beta-global city, Karachi serves as Pakistan's primary industrial and financial hub, boasting a GDP of over $200 billion. This cosmopolitan city is celebrated for its linguistic, ethnic, and religious diversity, making it one of Pakistan's most progressive and socially liberal regions.

Colombo: Colombo is the largest city in Sri Lanka with a population of 5.6 million. It serves as the financial center and a popular tourist destination. Located on the west coast, it is also called the capital, although the legislative capital is Sri Jayawardenepura Kotte. Colombo is known for its blend of modern life, colonial architecture, and vibrant atmosphere.

Phnom Penh: Phnom Penh is Cambodia's capital and largest city. It has been the national capital since the French protectorate and is now the country's economic, industrial, and cultural center. Oudong was the former capital before Phnom Penh took its place.

Bandung: Bandung is the capital city of West Java province in Indonesia and is known as the country's second-largest metropolitan area, with a population of over 11 million. Situated on the island of Java, it has cooler temperatures and is surrounded by volcanic mountains, making it a natural fortress. Bandung's elevation is 768 meters above sea level and it is located around 140 kilometers southeast of Jakarta. The city was chosen as the new capital by the Dutch East Indies government due to its strategic location. Additionally, Bandung has a strong economy and is ranked as the ninth-largest in ASEAN, after Greater Hanoi.

Jakarta: Jakarta is the capital and largest city of Indonesia, located on the northwest coast of Java. It is the largest metropole in Southeast Asia and serves as the diplomatic capital of ASEAN. Jakarta borders West Java and Banten provinces and faces the Java Sea. With a metropolitan area that is ASEAN's second-largest economy, it is a significant global city.

Malang: Malang is a city in East Java, Indonesia, known for its rich history dating back to the Singhasari Kingdom. It is the second most populous city in the province, with a population of around 846,126 people. The Malang Metropolitan area has a population of 3,663,691 spread across two cities and 22 districts. It is also the third largest city in East Java in terms of economy, with an estimated GDP of Rp. 44.30 trillion in 2016.

Semarang: Semarang is the capital and largest city of Central Java in Indonesia. It was a significant port during the Dutch colonial period and remains an important regional center and port today. It has been recognized as the cleanest tourist destination in Southeast Asia by the ASEAN Clean Tourist City Standard (ACTCS) for 2020–2022.

Surabaya: Surabaya is a major city in Indonesia, located in East Java. It is the second-largest city in the country and serves as a significant port. Surabaya is considered one of the four main central cities in Indonesia and has a population of over 2.8 million. The Surabaya metropolitan area is the second-largest in Indonesia and boasts a thriving economy, even surpassing Hanoi in terms of size.

Yogyakarta: Yogyakarta is the capital city of the Special Region of Yogyakarta, Indonesia. It is known for being ruled by a monarchy and is a center for classical Javanese arts and culture. Yogyakarta is famous for ballet, batik textiles, drama, literature, music, poetry, silversmithing, visual arts, and wayang puppetry. It is also a hub for education, with a large student population and prestigious schools and universities, including Gadjah Mada University.

Medan: Medan is the capital and largest city of North Sumatra, Indonesia. It is a multicultural metropolis and regional hub with international airport and major port. Medan is a financial center for Sumatra and an entry point to western Indonesia. The economy relies on trading, agriculture, and palm oil plantations. It is considered one of Indonesia's main central cities, alongside Jakarta, Surabaya, and Makassar.

Padang: Padang is the capital and largest city of West Sumatra province in Indonesia. With a population of over 900,000 people, it is the 16th most populous city in Indonesia. Padang is famous for its Minangkabau culture, cuisine, and beautiful sunset beaches. It is also home to the third most populous metropolitan area in Sumatra, with a population of over 1.4 million.

Palembang: Palembang is the capital city of South Sumatra, Indonesia. It spans both banks of the Musi River and covers 352.51 square kilometres. With a population of around 1.7 million, it is the second most populous city in Sumatra and the twelfth most populous in Indonesia.

Makassar: Makassar, formerly Ujung Pandang, is the capital of South Sulawesi province in Indonesia. It is the largest city in Eastern Indonesia and the fifth-largest urban center in the country. Makassar is situated on the southwest coast of Sulawesi, facing the Makassar Strait.

Vientiane: Located on the banks of the Mekong, Vientiane is Laos's capital and largest city. It was a French administrative capital and now serves as the economic center of the country. With a population of 1,001,477, it is situated at the Thai border.

Johor Bahru: Johor Bahru, also known as JB, is the capital city of Johor, Malaysia. It is part of the Johor Bahru District, the second largest district in Malaysia by population. JB is a major economic contributor with the second largest GDP among Malaysian cities. It is a key component of Iskandar Malaysia, the country's largest special economic zone. The city is home to a population of 858,118 people spread across 391.25 km2.

Kuala Lumpur: Kuala Lumpur, or KL, is the capital city and federal territory of Malaysia. It is the largest city in the country, spreading across 243 km2 with a population of 2.16 million. The Klang Valley, also known as Greater Kuala Lumpur, is a bustling urban area with a population of 7.56 million. This region is experiencing rapid growth in both population and economy and is considered one of the fastest-growing metropolitan regions in Southeast Asia.

Mandalay: Mandalay, Myanmar's second-largest city, is situated on the east bank of the Irrawaddy River, 631 km north of Yangon. It boasts a population of 1,225,553 people.

Yangon: Yangon, formerly Rangoon, is the capital of Yangon Region in Myanmar. It was the country's capital until 2006 when the administrative functions were moved to Naypyidaw. With over five million people, Yangon is Myanmar's largest city and main commercial center.

Manila: Manila is the capital and second-largest city of the Philippines, located on the eastern shore of Manila Bay. It is highly urbanized and known for its dense population. As the first chartered city in the country, it holds historical significance. Manila played a pivotal role in establishing global commercial networks through the galleon trade, connecting Asia with the Spanish Americas. It is one of Southeast Asia's most populous and rapidly growing cities, and Greater Manila boasts a significant economy within ASEAN.

Quezon City: Quezon City, or QC, is the largest city in the Philippines with a population of 2.96 million people. It was established on October 12, 1939, and named after Manuel L. Quezon, the country's second president.

Cebu City: Cebu City is a highly urbanized city in the Philippines, located in the Central Visayas region. It serves as the capital of the Cebu Province and is one of three cities with administrative independence. With a population of over 964,000 people, it is the most populous city in the Visayas and the sixth-most populated in the entire country.

Davao City: Davao City is a highly urbanized city in the Philippines, located in the Davao Region. With a land area of 2,443.61 km2, it is the largest city in the country. It is also the third-most populous city, with a population of 1,776,949 people. Davao City is known for its bustling urban environment and is the most populous city in Mindanao.

Bangkok: Bangkok, officially known as Krung Thep Maha Nakhon, is the capital and largest city of Thailand. It spans an area of 1,568.7 square kilometers and has a population of around 10.5 million. Additionally, the Bangkok Metropolitan Region is home to over 14 million people. As an economic powerhouse, it significantly contributes to Thailand's economy, surpassing other urban centers in size and importance.

Chiang Mai: Chiang Mai is the largest city in northern Thailand and the capital of Chiang Mai province. It is located in the mountainous region called the Thai highlands, about 700 km north of Bangkok. With a population of 1.2 million people, it accounts for more than 66 percent of the total population of Chiang Mai province.

Da Nang: Da Nang is a major port city on the coast of Vietnam, located at the mouth of the Hàn River. It is the country's fifth-largest city and plays a crucial role as one of Vietnam's prominent port cities. Additionally, Da Nang holds municipality status, making it directly governed by the central government.

Haiphong: Haiphong is Vietnam's third-largest city and major port in the Red River Delta. It covers an area of 1,562 km2 with 8 urban districts and 7 rural districts, including two island regions. With a population of 2,359,000 in 2021, the city boasts a strong manufacturing economy, supported by extensive industrial parks and traditional handicraft villages.

Hanoi: Hanoi, the capital of Vietnam, is the second-most populous city in the country. It is bordered by the Red River and the Black River. Hanoi consists of 12 urban districts, 17 rural districts, and 1 district-level town. With an area of 3,359.82 km2 and a population of 8,435,700, it is a significant and bustling municipality. In terms of economic growth, Hanoi has the second-highest gross regional domestic product in Vietnam, amounting to 51.4 billion USD in 2020. Additionally, Hanoi Capital is also the 8th largest economy in the ASEAN region.

Ho Chi Minh City: Ho Chi Minh City, formerly known as Saigon, is Vietnam's most populous city with a population of around 9.3 million in 2023. It is characterized by its rivers and canals, with the Saigon River being the largest. The city comprises 16 urban districts, 6 rural districts, and 1 municipal city. It serves as Vietnam's primary financial center, contributing a significant portion of the country's GDP, and is ASEAN's 6th largest economy, making it the largest outside an ASEAN country capital.

Beirut: Beirut is the capital and largest city of Lebanon, situated on a peninsula along the country's Mediterranean coast. With a population of 2.5 million, it is the third-largest city in the Levant and thirteenth-largest in the Arab world. Having a history of over 5,000 years, Beirut is one of the oldest cities globally.

Doha: Doha is the capital and financial center of Qatar, located on the Persian Gulf coast. It houses the majority of Qatar's population and is the country's fastest-growing city.

Kuwait City: Kuwait City is the capital and largest city of Kuwait, situated on the southern coast of Kuwait Bay. It serves as the political, cultural, and economic hub of the emirate, hosting landmarks like Seif Palace and government offices. It also houses the headquarters of major Kuwaiti corporations and banks. Known for its scorching summers, the city experiences average high temperatures surpassing 45°C (113°F) for three months annually.

Baku: Baku is the capital and largest city of Azerbaijan, located on the southern shore of the Absheron Peninsula. It is the lowest lying national capital in the world, sitting 28 meters below sea level. Baku is also the largest city below sea level globally. With a population of around two million, it is the sole metropolis in Azerbaijan and 25% of the country's residents live in its metropolitan area.

Tbilisi: Tbilisi, the capital of Georgia, is a city with a population of around 1.2 million people. It was founded in the fifth century AD and has since been the capital of several Georgian kingdoms and republics. From 1801 to 1917, Tbilisi served as the seat of the Caucasus Viceroyalty under the Russian Empire, governing the northern and southern regions of the Caucasus. Tbilisi is also known by its pre-1936 name, Tiflis.

Yerevan: Yerevan, the capital city of Armenia, is one of the world's oldest continuously inhabited cities. It is located along the Hrazdan River and serves as the administrative, cultural, and industrial center of the country. Yerevan has been the capital since 1918 and is the fourteenth in the history of Armenia. It is also the seat of the Araratian Pontifical Diocese, the largest diocese of the Armenian Apostolic Church and one of the oldest in the world.

Baghdad: Baghdad is the capital of Iraq, situated on the Tigris river. It became the capital of the Abbasid Caliphate in 762 AD, leading to its remarkable growth as a cultural and intellectual hub in the Muslim world. The city housed renowned institutions like the House of Wisdom, attracting diverse groups of scholars and cementing its reputation as the "Center of Learning."

Basra: Basra is a city in southern Iraq on the Shatt al-Arab. With an estimated population of 1.4 million in 2018, it serves as Iraq's main port. Although lacking deep water access, the construction of the Grand Faw Port is underway to address this. Once completed, it will become one of the world's largest ports and enhance Iraq's geopolitical position. Additionally, Iraq aims to establish a significant naval base in the Faw peninsula.

Mosul: Mosul is a major city in northern Iraq and the capital of Nineveh Governorate. It is the second-largest city in Iraq after Baghdad, with a population of over 3.7 million. Located 400 km north of Baghdad on the Tigris river, Mosul has grown to include substantial areas on both riverbanks. The city also includes the ruins of the ancient Assyrian city of Nineveh, once the largest city in the world.

Ahvaz: Ahvaz is the capital city of Ahvaz County, Khuzestan province, Iran. It is a diverse city with a population of about 1,184,788. The region is home to Persians, Arabs, Bakhtiaris, Dezfulis, Shushtaris, and others. The languages spoken here include Persian, Arabic, Luri, Dezfuli, Shushtari, and more. The city, along with the nearby town of Sheybani, is inhabited by over 1.2 million people.

Isfahan: Isfahan is a major city in Iran, located 440 kilometers south of Tehran. It serves as the capital of Isfahan Province and has a population of around 2.2 million. Isfahan is the third-most populous city in Iran and the second-largest metropolitan area after Tehran.

Kermanshah: Kermanshah is the capital city of Kermanshah Province in western Iran, situated about 525 kilometers from Tehran. It has a population of 946,651 people, as reported by the 2016 census.

Mashhad: Mashhad, also known as Mashad, was once the capital of Persia during the Afsharid dynasty. It is now the second-largest city in Iran, located about 900 kilometers northeast of Tehran. Serving as the capital of Razavi Khorasan Province, Mashhad has a population of approximately 3.4 million and includes the areas of Mashhad Taman and Torqabeh.

Qom: Qom is the capital city of Qom province in Iran, located 140 km south of Tehran. It serves as the capital of the province, county, and district. Qom is the seventh largest metropolis and city in Iran, situated on the banks of the Qom River.

Shiraz: Shiraz is Iran's fifth-largest city, serving as the capital of Fars Province. With a population of 1.5 million in 2016 and reaching 1.9 million in 2021, it has a long history as a regional trade hub. Situated in southwestern Iran, Shiraz enjoys a moderate climate and is located near the seasonal river Rudkhaneye Khoshk.

Tabriz: Tabriz is a populous city in northwestern Iran and serves as the capital of both the East Azerbaijan province and its county. It is located in the Central District and ranks as the sixth-largest city in Iran.

Tehran: Tehran is the capital and largest city of Iran with a population of around 9 million. It is also the most populous city in Western Asia and has the second-largest metropolitan area in the Middle East. The city is ranked 24th in the world by metropolitan area population.

Jerusalem: Jerusalem is an ancient city in West Asia, considered holy by Judaism, Christianity, and Islam. It is located on a plateau in the Judaean Mountains between the Mediterranean and the Dead Sea. Israel and Palestine both claim it as their capital, but international recognition is limited.

Tel Aviv: Tel Aviv, also known as Tel Aviv-Yafo, is the economic and technological hub of Israel. Situated on the Mediterranean coastline, it is the most populous city in the Gush Dan metropolitan area with a population of 467,875. Tel Aviv holds the title of the country's second-largest city after Jerusalem if East Jerusalem is included, but the most populous city if East Jerusalem is excluded. It serves as a major center for commerce and innovation in Israel.

Amman: Amman is the capital and largest city of Jordan, functioning as its economic, political, and cultural hub. It has a population of 4,061,150, making it Jordan's primate city and the largest in the Levant region. It is also the fifth-largest city in the Arab world and the tenth-largest metropolitan area in the Middle East.

Muscat: Muscat is the capital and largest city in Oman, with a population of 1.72 million. It is known for its historical trade importance and has been ruled by various indigenous tribes and foreign powers throughout history. Muscat's influence extended to East Africa and it attracted traders and settlers from different regions. Since the 1970s, it has undergone rapid development, leading to a vibrant economy and a diverse society. Muscat is classified as a Beta-Global City by the Globalization and World Cities Research Network.

Gaza City: Gaza City, located in the Gaza Strip, is the largest city in the State of Palestine, with a population of 590,481.

Jeddah: Jeddah is a port city in Saudi Arabia, located along the Red Sea coast. It has served as a commercial center and a travel hub for Muslim pilgrims going to Mecca since 647. Jeddah has been the gateway for millions of pilgrims, historically by sea and now by air.

Mecca: Mecca is the holiest city in Islam and the capital of Mecca Province in western Saudi Arabia. It is situated inland from Jeddah on the Red Sea, at an elevation of 277 m (909 ft) above sea level. The city's population reached 1.58 million people in 2015 and is estimated to have grown to 2.04 million in 2020. Mecca attracts millions of pilgrims each year during the Ḥajj pilgrimage, observed in the twelfth month of Dhūl-Ḥijjah.

Medina: Medina, also known as Al-Madinah al-Munawwarah, is the capital of Medina Province in western Saudi Arabia. It is one of the holiest cities in Islam, with an estimated population of 1,488,782 as of 2020. Spread over 589 km2, it has an urban area of 293 km2, while the rest is occupied by the Hejaz Mountains, valleys, agricultural spaces, and dormant volcanoes.

Riyadh: Riyadh, initially called Hajr al-Yamamah, serves as the capital and largest city of Saudi Arabia. It is the center of the Riyadh Province and the Riyadh Governorate.

Aleppo: Aleppo is a major city in Syria, once the country's largest, now second to Damascus. It serves as the capital of Aleppo Governorate and is highly populous. The city is situated in the northern regions of Syria and is considered one of the largest cities in the Levant region.

Damascus: Damascus, the capital of Syria, is the world's oldest capital and considered by some as the fourth holiest city in Islam. Known as aš-Šām in Syria, it is called the "City of Jasmine" and serves as a significant cultural hub in the Levant and the Arab world.

Adana: Adana is a major city in southern Turkey, located on the Seyhan River, about 35 km from the Mediterranean Sea. It serves as the administrative center of Adana province. With a population of 1,779,463, it ranks fifth among the most populous cities in Turkey.

Ankara: Ankara, historically known as Ancyra and Angora, is the capital of Turkey. With a population of 5.1 million in the urban center and 5.7 million in Ankara Province, it is the second-largest city in Turkey after Istanbul. It is located in the central part of Anatolia and covers an expansive urban area of 2,767 km2.

Antalya: Antalya, Turkey's fifth-most populous city and capital of Antalya Province, is renowned as the "capital of tourism." Situated on the southwest coast of Anatolia and flanked by the majestic Taurus Mountains, it stands as the largest city on the Mediterranean coast, excluding the Aegean region. With a metropolitan population of over 2.6 million people, Antalya holds significant importance in Turkish history and culture.

Bursa: Bursa is a major city in northwestern Turkey and the administrative center of Bursa Province. It is the country's fourth-most populous city, a prominent industrial center, and a hub for automotive production in Turkey.

Eskişehir: Eskişehir is a city in northwestern Turkey, serving as the capital of the Eskişehir Province. It has a population of 898,369 and is situated on the banks of the Porsuk River, 792 m above sea level. The city boasts hot springs and is surrounded by the fertile Phrygian Valley. Eskişehir is known as a university town, housing Eskişehir Technical University, Eskişehir Osmangazi University, and Anadolu University. It is located in close proximity to the ancient city of Dorylaeum and spans an area of 2,678 km2.

Gaziantep: Gaziantep, formerly known as Aintab and informally as Antep, is a major city in south-central Turkey. It serves as the capital of Gaziantep Province, lies in the Southeastern Anatolia and Mediterranean Regions, and is situated on the Sajur River. This historical city is believed to be located on the site of ancient Antiochia ad Taurum and is in close proximity to ancient Zeugma.

Istanbul: Istanbul is Turkey's largest city, acting as its economic, cultural, and historic center. Straddling the Bosporus Strait, it is located in both Europe and Asia with a population of over 15 million, representing 19% of Turkey's population. Istanbul is the most populous European city and the 15th largest globally.

İzmir: İzmir, a metropolitan city on the west coast of Anatolia, is the third most populous city in Turkey. It is the capital of İzmir Province and the largest urban agglomeration on the Aegean Sea.

Abu Dhabi: Abu Dhabi is the capital city of the United Arab Emirates and the Emirate of Abu Dhabi. It is the second-most populous city in the UAE and serves as the center for the Abu Dhabi Metropolitan Area.

Dubai: Dubai, the largest city in the UAE, is also the capital of the Emirate of Dubai. It is highly populous and one of the seven emirates in the country.

Aden: Aden is a vital port city located in Yemen, serving as a pivotal maritime hub connecting Africa, Asia, and the Middle East. Its strategic position lies near the eastern approach to the Red Sea, approximately 170 km east of the Bab-el-Mandeb strait. With a population of around 1,080,000 residents, it stands as one of Yemen's largest cities.

Sanaa: Sanaa, also known as Sana'a or Sana, is the capital and largest city of Yemen. It is located in the separate administrative district of ʾAmānat al-ʿĀṣimah and is the capital of the Sanaa Governorate. Despite the government's move to Aden in 2015, Sanaa remains the constitutional capital of Yemen.

Minsk: Minsk is the capital and largest city of Belarus, situated on the Svislach and Niamiha rivers. With a population of two million, it is the 11th-most populous city in Europe. Minsk holds a special administrative status in Belarus, serving as the administrative center of Minsk Region and District. Additionally, it is an administrative capital of the Commonwealth of Independent States (CIS) and the Eurasian Economic Union (EAEU).

Sofia: Sofia is Bulgaria's capital and largest city, located in the Western part of the country. Situated at the skirts of Vitosha mountain, it is built around the Iskar river and known for its natural mineral springs, like the Sofia Central Mineral Baths. The city has a continental climate and is strategically located in the center of the Balkans, making it a midpoint between the Black Sea, Adriatic Sea, and Aegean Sea.

Zagreb: Zagreb is Croatia's capital and largest city, situated along the Sava river and surrounded by the Medvednica mountain. It stands near the Croatian-Slovenian border and sits at an elevation of 158 m (518 ft) above sea level. With a population of 767,131, it forms an urban agglomeration of over one million people.

Sarajevo: Sarajevo, the capital and largest city of Bosnia and Herzegovina, is situated in the Balkans. It has a population of 275,524, expanding to 555,210 in the broader metropolitan area. The city is nestled within the picturesque Sarajevo valley, enveloped by the stunning Dinaric Alps and placed along the Miljacka River.

Prague: Prague, the Czech Republic's capital, is also the largest city and historical capital of Bohemia. Situated on the Vltava river, it is home to around 1.3 million inhabitants. The city boasts a temperate oceanic climate with mild summers and cold winters.

Budapest: Budapest is the capital and largest city of Hungary, situated on the Danube river. It has a population of about 1.75 million within city limits and is the 9th largest city in the European Union. The Budapest metropolitan area, with a population of 3.3 million, serves as the country's center. Overall, Budapest is a significant primate city, accounting for one-third of Hungary's population.

Gdańsk: Gdańsk, a city in northern Poland, is the capital of the Pomeranian Voivodeship. It is a major seaport and the country's fourth-largest metropolitan area, with a population of 486,492.

Łódź: Łódź, a city in central Poland, is a former industrial center and the capital of Łódź Voivodeship. It is situated about 120 km (75 mi) southwest of Warsaw. With a population of 655,279, as of 2023, it is the country's fourth largest city.

Kraków: Kraków, also spelled Cracow, is Poland's second-largest city and one of the oldest. It was the official capital until 1596 and remains a center of academic, economic, cultural, and artistic pursuits. Situated on the Vistula River, it boasts a beautiful Old Town with the renowned Wawel Royal Castle, designated a UNESCO World Heritage Site in 1978.

Poznań: Poznań is a major city in west-central Poland along the River Warta. It is known for its rich culture, business activities, and unique regional customs. The city boasts notable attractions such as the Renaissance Old Town, Town Hall, and Gothic Cathedral.

Warsaw: Warsaw is the capital and largest city of Poland, located on the River Vistula. It has a population of 1.86 million residents within a metropolitan area of 3.1 million. With an area of 517 square kilometers, it is the 6th most-populous city in the European Union. Warsaw is an alpha global city and serves as the country's seat of government. It is also the capital of the Masovian Voivodeship.

Wrocław: Wrocław, located in southwestern Poland, is the largest city in the historical region of Silesia. Situated on the banks of the Oder and surrounded by the Silesian Lowlands, it is about 40 kilometers from the Sudeten Mountains. With an official population of approximately 674,132 in 2023, Wrocław is the third largest city in Poland. The city's metropolitan area has a population of around 1.25 million.

Bucharest: Bucharest is the capital and largest city of Romania. It is a cultural, financial, and entertainment center with a significant influence in Eastern Europe. The city is known for hosting important summits and has a strong presence in education, tourism, research, technology, healthcare, art, fashion, sports, and politics. Bucharest is a major economic hub, particularly in IT, finance, and manufacturing. It boasts improved infrastructure and is situated in the southeast of Romania, near the Danube River and the Bulgarian border. The city is densely populated, both within the European Union and in Eastern Europe. It served as the capital of Wallachia and the United Principalities of Moldavia and Wallachia in the past.

Moscow: Moscow, the capital and largest city of Russia, is located on the Moskva River in Central Russia. Its population exceeds 13 million within the city limits, 18.8 million in the urban area, and 21.5 million in the metropolitan area. Covering 2,511 square kilometers, it is one of the largest cities in the world, boasting the largest urban and metropolitan area in Europe. Moscow is also Europe's most populous city and holds the distinction of being the largest city by land area on the European continent.

Vladivostok: Vladivostok is the largest city in Primorsky Krai, Russia's far east, situated near the Golden Horn Bay on the Sea of Japan. It spans 331.16 sq km with a population of 600,871 as of 2021. It is the second largest city in the Far Eastern Federal District and is located about 45 km from the China-Russia border.

Saint Petersburg: Saint Petersburg, formerly Petrograd and later Leningrad, is Russia's second-largest city and fourth-most populous in Europe. Located on the River Neva, it is the world's northernmost city with over 1 million residents. As a historically important port, it was Russia's Imperial capital and now governed as a federal city.

Novosibirsk: Novosibirsk, the largest city in Siberia and third-largest in Russia, is the administrative center of Novosibirsk Oblast and the Siberian Federal District. Situated on the banks of the Ob River, it has a population of 1,633,595 as per the 2021 Census.

Omsk: Omsk, the administrative center of Omsk Oblast, is the third largest city in Siberia and twelfth-largest in Russia. It has a population of over 1.1 million and serves as a major transportation hub for the Trans-Siberian Railway and the Irtysh River.

Rostov-on-Don: Rostov-on-Don is a port city in Russia, serving as the administrative center of Rostov Oblast and the Southern Federal District. Located on the Don River, it is situated 32 kilometers from the Sea of Azov and north of the North Caucasus. The city has over one million residents and is known for being a significant cultural hub in Southern Russia.

Volgograd: Volgograd, formerly Tsaritsyn and Stalingrad, is the largest city and administrative center of Volgograd Oblast, Russia. It's situated on the western bank of the Volga River, spanning 859.4 square kilometers with a population of over one million people. It ranks as the 16th largest city in Russia by population, the second largest in the Southern Federal District, and the fourth largest city on the Volga.

Chelyabinsk: Chelyabinsk is a major city in Russia, serving as the administrative center of Chelyabinsk Oblast. It is the second-largest city in the Ural Federal District and the seventh-largest city in the country, with a population exceeding 1.1 million people. Situated along the Miass River, it lies to the east of the Ural Mountains.

Yekaterinburg: Yekaterinburg, also known as Ekaterinburg, is a major city in Russia, serving as the administrative center of Sverdlovsk Oblast and the Ural Federal District. Situated on the Iset River, it lies between the Volga-Ural region and Siberia. With a population of around 1.5 million residents, it is the fourth-largest city in Russia and the largest in the Ural Federal District. Yekaterinburg is renowned for its cultural and industrial significance, often referred to as the "Third capital of Russia". It boasts a thriving economy, vibrant culture, efficient transportation, and a flourishing tourism sector. Formerly known as Sverdlovsk, the city has played a crucial role in shaping the nation's history.

Kazan: Kazan is the capital of Tatarstan, Russia, located at the confluence of the Volga and Kazanka Rivers. It is the largest city on the Volga and the fifth-largest in Russia. With a population of over 1.3 million residents, it covers an area of 425.3 square kilometers. Kazan is also the most populous city in the Volga Federal District, with a metropolitan area population of nearly 2 million.

Nizhny Novgorod: Nizhny Novgorod, also known as Nizhny, is the administrative center of Nizhny Novgorod Oblast and the Volga Federal District in Russia. It is the sixth-largest city in Russia, with a population of over 1.2 million residents. Located at the confluence of the Oka and the Volga rivers, it is an important economic, transportation, scientific, educational, and cultural hub. Nizhny Novgorod is known for its universities, theaters, museums, and churches, and is a popular destination for river tourism.

Samara: Samara, formerly known as Kuybyshev, is a major city and administrative center in Russia. It is situated at the meeting point of the Volga and Samara rivers. With a population of over 1.14 million residents (1.22 million in the urban area), it is the eighth-largest city in Russia and the third most populous on the Volga. Covering an area of 541.382 square kilometers, Samara is part of the Volga Federal District.

Ufa: Ufa is the capital of Bashkortostan, Russia, located at the confluence of the Belaya and Ufa rivers. It is the largest city in the region and has a population of over 1.1 million residents, making it the fourth-most populous city in the Volga Federal District.

Belgrade: Belgrade, the capital and largest city of Serbia, is situated at the meeting point of the Sava and Danube rivers. Positioned at the crossroads of the Pannonian Plain and the Balkan Peninsula, it is recognized as a major city in Southeast Europe. With a population of 1,681,405 in the Belgrade metropolitan area, it ranks as the third most populous city on the Danube river.

Bratislava: Bratislava, also known as Preßburg (Pressburg), is Slovakia's capital and largest city. It has a population of around 475,000 officially, but it is estimated to be over 660,000. Situated in southwestern Slovakia, it is located at the foot of the Little Carpathians and occupies both banks of the Danube River and the left bank of the Morava River. Bratislava is unique among national capitals as it borders Austria and Hungary, making it the only one to border two sovereign states.

Dnipro: Dnipro, formerly known as Dnipropetrovsk, is the fourth-largest city in Ukraine with a population of one million. It is situated in the eastern part of the country, 391 km southeast of Kyiv, on the Dnipro River. As the administrative center of Dnipropetrovsk Oblast, it is also home to the administration of Dnipro urban hromada.

Donetsk: Donetsk, once known by various names like Aleksandrovka, Yuzivka, Stalin, and Stalino, is an important industrial city in eastern Ukraine. It is located on the Kalmius River in Donetsk Oblast, which is currently occupied by Russia. With a population estimated at 901,645 in the city center and over 2 million in the metropolitan area, Donetsk was Ukraine's fifth-largest city according to the 2001 census.

Kharkiv: Kharkiv, or Kharkov, is Ukraine's second-largest city and the administrative center of Kharkiv Oblast. It is located in the northeast of the country and has a population of 1,421,125. Known as the largest city in the historic region of Sloboda Ukraine, it is also the center of Kharkiv Raion.

Kyiv: Kyiv is the capital and largest city of Ukraine, situated in north-central Ukraine on the Dnieper River. With a population of 2,952,301, it is the seventh-most populous city in Europe. Known for its significance in industry, science, education, and culture in Eastern Europe, Kyiv boasts high-tech industries, renowned universities, and notable landmarks. The city also offers an extensive public transport system, including the Kyiv Metro.

Lviv: Lviv, the largest city in western Ukraine, has a population of 717,273. It serves as the administrative center of Lviv Oblast and is a major cultural hub. Named after Leo, the son of King Daniel of Ruthenia, it also hosts the administration of Lviv urban hromada.

Odesa: Odesa is a major seaport and transport hub in Ukraine, located on the northwestern shore of the Black Sea. It is the third most populous city in the country and serves as the administrative centre of Odesa Raion and Odesa Oblast. This multiethnic cultural centre has a population of approximately 1,010,537 as of January 2021. Unfortunately, due to the bombing during the 2022 Russian invasion of Ukraine, its historic city centre was declared a World Heritage Site in danger by UNESCO on 25 January 2023. This recognition acknowledges Odesa's significant contributions to cinema, literature, and the arts.

Copenhagen: Copenhagen, the capital and largest city of Denmark, is situated on the islands of Zealand and Amager. With a population of approximately 660,000 in the municipality and 1.4 million in the urban area, it is also Scandinavia's most populous city. Copenhagen is separated from Malmö, Sweden, by the Øresund strait, which is bridged by the Øresund Bridge for easy rail and road connectivity between the two cities.

Tallinn: Tallinn is the capital and largest city of Estonia, situated on the Gulf of Finland. It is a major center for government, finance, industry, and culture. With a population of approximately 454,000, it is located northwest of Tartu and south of Helsinki. Tallinn was formerly known as Reval and has historical significance spanning centuries.

Helsinki: Helsinki is the capital and largest city in Finland, located on the shore of the Gulf of Finland. It has a population of 673,011 and a thriving urban area of 1,360,075. Helsinki is a major center for politics, education, finance, culture, and research in Finland. It is strategically situated with close historical links to Tallinn, Estonia, Stockholm, Sweden, and Saint Petersburg, Russia.

Riga: Riga is the capital and largest city of Latvia, with a population of roughly 609,489 people. It is also the primate city, accounting for about a third of the country's total population. Located at the mouth of the Daugava river on the Gulf of Riga, it sits at a flat and sandy plain about 1-10 meters above sea level. The city covers an area of 307.17 km2 and is part of a metropolitan area with an estimated population of 860,142.

Vilnius: Vilnius is the capital and largest city of Lithuania, with an estimated population of 593,436 as of July 2023. The urban area extends beyond the city limits, and in 2020, it had around 718,507 residents. By November 2023, the combined population of the city and district municipalities reached approximately 768,342.

Oslo: Oslo is the capital and largest city of Norway, serving as both a county and municipality. With a population of 709,037 in 2022, the city also comprises a greater urban area of 1,064,235 residents. Its metropolitan area had an estimated population of 1,546,706 in 2021.

Stockholm: Stockholm is the capital and largest city of Sweden, with a population of approximately 1 million people in the municipality and 2.1 million in the urban area. It is located across fourteen islands where Lake Mälaren meets the Baltic Sea and is surrounded by the Stockholm archipelago. The city has a rich history dating back to the Stone Age and was officially founded in 1252. Stockholm serves as the county seat of Stockholm County.

Vienna: Vienna, the capital of Austria, is the country's largest city and a major cultural, economic, and political center. With a population of approximately two million, it is Austria's most populous city and located on the Danube river. Vienna is also the fifth-largest city in the European Union.

Antwerp: Antwerp is a city and municipality in Flemish Region, Belgium. It is the capital of Antwerp Province, the largest city, and the third largest in Belgium. With a population of 536,079, it is also the most populous municipality in the country. The metropolitan area has over 1,200,000 people, making it the second-largest in Belgium after Brussels.

Brussels: Brussels is the capital and central region of Belgium, consisting of 19 municipalities. It is part of both the French and Flemish communities but separate from the Flemish and Walloon regions.

Bordeaux: Bordeaux is a port city in southwestern France, situated on the Garonne river. It serves as the capital of the Nouvelle-Aquitaine region and the Gironde department. Its residents are known as "Bordelais" or "Bordelaises." This term can also encompass the city and its surrounding region.

Lyon: Lyon, or Lyons, is the third-largest city in France, situated at the confluence of the Rhône and Saône rivers. It is located northwest of the French Alps and is approximately 391 km southeast of Paris. Lyon is 278 km north of Marseille, 113 km southwest of Geneva, and 58 km northeast of Saint-Étienne.

Marseille: Marseille is the capital of the Provence-Alpes-Côte d'Azur region in southern France, located on the Mediterranean coast near the Rhône river. It is the prefecture of the Bouches-du-Rhône department, known for its vibrant inhabitants known as Marseillais.

Nantes: Nantes is the sixth largest city in France, located in Loire-Atlantique on the Loire River. It has a population of 320,732 in the city and close to 1 million in its metropolitan area. Nantes is known for its proximity to the Atlantic coast and its connection with Saint-Nazaire, forming a significant metropolitan region in north-western France.

Nice: Nice is a city in the Alpes-Maritimes department, France, known for its location on the French Riviera. It has a population of around one million and covers an area of 744 km2. Nice is the second-largest city on the Mediterranean coast, after Marseille, and is close to Monaco and the French–Italian border. The city's airport serves as a gateway to the region.

Paris: Paris is the capital and largest city of France, with a population of over 2.1 million people. It is a prominent global center for finance, culture, commerce, and fashion. Considered the City of Light, Paris has played a significant role in the arts and sciences and is renowned for its extensive street lighting system.

Strasbourg: Strasbourg, located on the border between France and Germany, is the largest city and prefecture of the Grand Est region in eastern France. As the official seat of the European Parliament, it holds great political significance.

Toulouse: Toulouse, located on the River Garonne, is the prefecture of Haute-Garonne and Occitania. With a population of over half a million, it is the fourth-largest city in France. The metropolitan area boasts 1.5 million inhabitants and shows rapid growth.

Berlin: Berlin is Germany's capital and largest city, with a population of over 3.85 million. It is also the most populous city in the European Union. The urban area has about 4.5 million residents, making it the largest in Germany. Berlin is surrounded by the state of Brandenburg and its capital, Potsdam. The Berlin-Brandenburg capital region has a population of around 6.2 million and is the second-largest metropolitan region in Germany. It is also ranked as the sixth-largest metropolitan region by GDP in the European Union.

Cologne: Cologne is the largest city in the German state of North Rhine-Westphalia and the fourth-most populous city in Germany. It has over 1.1 million inhabitants in the city proper and over 3.1 million people in the surrounding urban region. Located on the left bank of the Rhine River, Cologne is about 35 km southeast of the capital Düsseldorf and 25 km northwest of Bonn, the former capital of West Germany.

Dresden: Dresden, the capital city of Saxony in Germany, is the second most populous city after Leipzig. It is the 12th most populous city in Germany, fourth largest by area, and third most populous in former East Germany. The urban area includes towns like Freital, Pirna, and Radebeul, with a total population of around 790,000. The Dresden metropolitan area has roughly 1.34 million inhabitants.

Düsseldorf: Düsseldorf is the capital of Germany's most populous state, North Rhine-Westphalia. It is the second-largest city in the state, after Cologne, and the seventh-largest in Germany, with a population of 653,253.

Frankfurt: Frankfurt, officially known as Frankfurt am Main, is a populous city in the German state of Hesse. It is the fifth-most populous city in Germany and an "alpha world city." Located on the Main River, it forms a larger urban area with Offenbach am Main. It is the heart of the Rhine-Main metropolitan region, Germany's second-largest metropolitan region. Frankfurt's central business district is about 90 km northwest of the EU's geographic center. The city derives its name from the Franks and is the largest city in the Rhenish Franconian dialect area.

Hamburg: Hamburg is the second-largest city in Germany and the eighth-largest in the European Union. It has a population of over 1.9 million with a total of 5.1 million in the Hamburg Metropolitan Region. Situated on the River Elbe, it is known for its thriving port, which is the largest in Germany and the third-largest in Europe. Hamburg is one of Germany's three city-states and is surrounded by Schleswig-Holstein and Lower Saxony. The local dialect is a variant of Low Saxon.

Munich: Munich is the capital of Bavaria and the third-largest city in Germany, with a population of over 1.5 million. It is not its own state, but it is the 11th largest city in the EU. The city's metropolitan region is home to around six million people and has the third largest GDP in the EU.

Nuremberg: Nuremberg is the largest city in Franconia and the second-largest city in Bavaria, Germany, with a population of 545,000. It ranks as the 14th largest city in the country.

Stuttgart: Stuttgart is the capital of Baden-Württemberg, Germany, and is situated in a fertile valley called Stuttgarter Kessel. It has a population of 635,911, making it the sixth largest city in Germany. The city's administrative region has over 2.8 million people, and its metropolitan area has nearly 5.5 million people, ranking it fourth in Germany. Stuttgart is known for its strong economy, with consistently high GDP rankings among European metropolitan areas. It is also recognized for its quality of living and innovation. Additionally, Stuttgart hosted official FIFA World Cup tournaments in 1974 and 2006.

Dublin: Dublin is Ireland's capital and largest city, situated on a bay where the River Liffey meets the sea. It belongs to the province of Leinster and is bordered by the Dublin Mountains. In 2022, the city had a population of 592,713, while the wider Dublin City and its suburbs reached 1,263,219 inhabitants. County Dublin's population stands at 1,501,500.

Amsterdam: Amsterdam is the capital and largest city of the Netherlands, known as the "Venice of the North" due to its extensive canal system. It has a population of 921,402, with a total of 1,457,018 in the urban area and 2,480,394 in the metropolitan area. The Hague serves as the seat of government. The city is located in the North Holland province and its canals have been designated a UNESCO World Heritage Site.

The Hague: The Hague is a city in the Netherlands, serving as the administrative center and seat of government. It is the capital of the province of South Holland and has been considered the de facto capital of the country. Situated on the west coast, facing the North Sea, it plays a significant role in the nation's governance despite Amsterdam being the official capital.

Rotterdam: Rotterdam, the Netherlands' second-largest city, is located in South Holland. Situated at the North Sea mouth of the Rhine–Meuse–Scheldt delta, it is connected to the Meuse and Rhine through the "New Meuse" shipping channel.

Geneva: Geneva, a city in Switzerland, is the country's second-most populous and the largest French-speaking city in the region called Romandy. Situated in the southwest, it serves as the capital of the Republic and Canton of Geneva. Known for its international diplomacy, Geneva is home to a plethora of international organizations, making it the global hub for such institutions.

Zürich: Zürich is Switzerland's largest city and the capital of the canton of Zürich. It is located in north-central Switzerland, by Lake Zürich. The municipality has over 443,037 inhabitants, with a wider urban area of 1.315 million people. Zürich is a major transportation hub with busy railways, roads, and an international airport.

Birmingham: Birmingham is the second-largest city in Britain, located in the West Midlands of England. It has a population of 1.145 million and is commonly known as the second city of the United Kingdom. Birmingham is part of the West Midlands conurbation, including Wolverhampton, Dudley, and Solihull, with a wider metropolitan area population of 4.3 million, making it the largest outside of London.

Leeds: Leeds is the largest settlement in Yorkshire, England, and serves as the administrative center for the City of Leeds Metropolitan Borough. Situated around the River Aire and in the eastern foothills of the Pennines, it was originally a small manorial borough in the 13th century and later grew into a bustling market town. Over the centuries, Leeds became renowned as a significant production and trading hub, playing a crucial role in the invention of carbonated water in the 1760s.

Liverpool: Liverpool is a city and borough in Merseyside, North West England, with a population of 486,100. It lies on the eastern side of the Mersey Estuary, near the Irish Sea, about 178 miles from London. Liverpool is the largest settlement in the Liverpool City Region, which has a population of 1,551,722. The wider Liverpool built-up area is the third largest in England and Wales outside of London. The region has political boundaries and economic ties with neighboring counties.

London: London is the capital and largest city of England and the UK, situated on the River Thames. It has a population of around 8.8 million and has been a major settlement for almost 2,000 years. The City of London is the ancient core and financial center, founded by the Romans as Londinium. The City of Westminster, located to the west, houses the national government and parliament. London refers to the entire metropolis, historically spread across multiple counties, but since 1965 it is mainly comprised of Greater London, governed by 33 local authorities and the Greater London Authority.

Manchester: Manchester, a city in Greater Manchester, England, has a population of 552,000. It is surrounded by the Cheshire Plain, Pennines, and Salford. The city shares borders with Trafford, Stockport, Tameside, Oldham, Rochdale, Bury, and Salford.

Edinburgh: Edinburgh is Scotland's capital city, situated in south-east Scotland. It is surrounded by the Firth of Forth estuary and the Pentland Hills. With a population of around 506,520, it ranks as the second-most populous city in Scotland and seventh in the United Kingdom.

Glasgow: Glasgow is Scotland's largest city and the third-largest city in the UK and Europe. It has a population of approximately 632,350 in the city and 1,028,220 in the urban area. Originally part of Lanarkshire, it became a county in 1893 and now includes former settlements of Renfrewshire and Dunbartonshire. Glasgow is a council area in Scotland, managed by the Glasgow City Council.

Cardiff: Cardiff is the capital and largest city of Wales, situated in the southeast of the country. It has a population of about 362,310 in 2021 and is part of the City and County of Cardiff. Formerly a small port town, its growth was accelerated by coal mining in the region. Cardiff is the county town of Glamorgan and has been the capital of Wales since 1955. It is also a member of the Eurocities network. The Cardiff Built-up Area extends beyond the county boundary, including the towns of Dinas Powys and Penarth.

Belfast: Belfast, the capital of Northern Ireland, is the largest city on the east coast, situated along the River Lagan. It is the 10th-largest urban area in the UK and the second-largest city on the island. In 2021, the city had a population of 293,298, while its metropolitan area was home to 671,559 people in 2011. The Belfast Local Government District had a population of 345,418 in 2021.

Athens: Athens is a coastal urban area and the capital of Greece. It is the fifth largest urban area in the EU, with a population of over five million. The city has a rich history dating back over 3,400 years and is one of the oldest cities in the world. It is named after Athena, the goddess of wisdom.

Genoa: Genoa is the capital of Liguria in Italy, serving as its largest city with a population of over half a million. It is also the sixth-largest city in Italy. Located along the Italian Riviera, the wider metropolitan area exceeds 1.5 million inhabitants.

Florence: Florence, the capital of Tuscany in Italy, is a bustling city with a population of 360,930 as of 2023. It holds the distinction of being the most populous city in Tuscany and boasts a metropolitan area with 984,991 residents.

Milan: Milan is a major city in Northern Italy, known as the economic capital of the country. It is the second-most populous city in Italy, with a population of about 1.4 million, and the fourth largest urban area in the European Union. Milan is renowned as a global financial center and the regional capital of Lombardy. Additionally, it has a metropolitan area with an estimated population between 4.9 to 7.4 million, making it the largest in Italy and one of the largest in the EU.

Naples: Naples is the capital of Campania and the third-largest city in Italy. It has a population of over 909,000 within the city limits and over 3.1 million in the surrounding metropolitan area. The city extends beyond its walls for about 20 miles and is a major center in southern Italy.

Palermo: Palermo is a historic city in southern Italy and serves as the capital of both Sicily and the Metropolitan City of Palermo. With a rich history of over 2,700 years, the city is renowned for its culture, architecture, gastronomy, and significant role throughout the years. Located on the northwest part of the island of Sicily, Palermo lies by the Gulf of Palermo in the Tyrrhenian Sea.

Rome: Rome is the capital city of Italy, located in the Lazio region. It is the most populous city in the country, with about 2.9 million residents. Rome is known for being the center of the Catholic Church and is often called the Eternal City. It has a rich history and is considered the cradle of Western civilization. Vatican City, an independent country, is located within Rome's boundaries.

Syracuse, Sicily: Syracuse, Sicily is a historic city known for its Greek and Roman history, culture, and architecture. It is the birthplace of renowned mathematician Archimedes. As a major power in the ancient Mediterranean world, Syracuse played a significant role. Situated in the southeast corner of Sicily, it is located near the Gulf of Syracuse and the Ionian Sea. The city sits on elevated land, although it is generally not hilly.

Turin: Turin, an important business and cultural center in Northern Italy, serves as the capital city of Piedmont and the Metropolitan City of Turin. From 1861 to 1865, it was the first capital of Italy. Located on the western bank of the Po River, below the Susa Valley, Turin is surrounded by the western Alpine arch and Superga hill. With a population of 843,514 in the city proper and an estimated 1.7 million in the urban area, it forms part of the Turin metropolitan area, which has a population of 2.2 million according to the OECD.

Venice: Venice is a city in northeastern Italy, known as the capital of the Veneto region. It is situated on 126 islands separated by canals and open water, connected by 472 bridges in the Venetian Lagoon. The city has around 258,685 residents, with 51,000 living in the historical island of Venice and the rest on the mainland. Venice is part of the Padua-Treviso-Venice Metropolitan Area, with a total population of 2.6 million.

Lisbon: Lisbon is the capital and largest city of Portugal, located on the western portion of the Iberian Peninsula. With a population of around 549,000, it is mainland Europe's westernmost capital and the only one along the Atlantic coast. Lisbon is known for its location on the River Tagus and its beautiful Portuguese Riviera, which includes Cabo da Roca, the westernmost point of Continental Europe.

Barcelona: Barcelona is the capital of Catalonia and the second-largest city in Spain. It has a population of 1.6 million within the city limits, and around 4.8 million people in its urban area. Situated on the northeastern coast of Spain, Barcelona is one of the largest metropolises on the Mediterranean Sea. It is known for its location between the Llobregat and Besòs rivers, with the Serra de Collserola mountain range to the west.

Madrid: Madrid, the capital and most populous city of Spain, has a population of 3.4 million and a metropolitan area of 6.7 million. It is the EU's second-largest city and its monocentric metropolitan area is also the second-largest in the EU. Spanning over 604.3 km2, Madrid lies on the River Manzanares in central Iberian Peninsula at 650 meters above sea level. As the capital of both Spain and the autonomous community of Madrid, it serves as the political, economic, and cultural hub of the country. The city experiences hot summers and cool winters.

Seville: Seville is the capital and largest city of Andalusia, located on the Guadalquivir River in southwest Spain.

Valencia: Valencia is the capital of the autonomous community of Valencia in Spain, with a population of 792,492. It is also the capital of the province with the same name. The city forms part of a larger urban area with around 1.6 million residents, making it one of the major urban areas in the Mediterranean region. It is situated on the east coast of the Iberian Peninsula, on the Turia River, near the Gulf of Valencia and north of the Albufera lagoon.

Zaragoza: Zaragoza, also called Saragossa, is the capital city of Zaragoza province and Aragon autonomous community, Spain. Situated along the Ebro river and its tributaries, Huerva and Gállego, it occupies a central location within both Aragon and the Ebro basin.

Adelaide: Adelaide is the capital and largest city of South Australia, and the fifth most populous city in Australia. It encompasses both Greater Adelaide and the Adelaide city centre. The residents of Adelaide are referred to as Adelaideans, and the city's Traditional Owners are the Kaurna people. The Kaurna language refers to the city centre and surrounding Park Lands as Tarndanya.

Brisbane: Brisbane, the capital and largest city of Queensland, Australia, has a population of about 2.6 million. Situated in South East Queensland, it is surrounded by other regional centers and lies on the Brisbane River peninsula, near Moreton Bay. Brisbane is known for its hilly floodplain, nestled between the Taylor and D'Aguilar mountain ranges. While spanning multiple local government areas, it is mainly governed by the City of Brisbane. The people of Brisbane are referred to as Brisbanites.

Canberra: Canberra is Australia's capital city, serving as the seat of government for the nation. It is the largest inland city in Australia and the eighth-largest overall. Located in the Australian Capital Territory, Canberra is situated at the northern end of the Australian Alps. As of June 2022, the estimated population of Canberra was 456,692.

Melbourne: Melbourne is the capital of Victoria and the second most populous city in Australia. It encompasses a vast metropolitan area known as Greater Melbourne, consisting of 31 municipalities. The City of Melbourne, centered around its central business area, is its primary local municipality.

Perth: Perth is the capital and largest city of Western Australia, with a population of 2.2 million in Greater Perth. It is the fourth most populous city in Australia and Oceania. Located between the Indian Ocean and the Darling Scarp, Perth has grown from its original British settlements on the Swan River. Its central business district and port of Fremantle are significant landmarks.

Sydney: Sydney is the capital city of New South Wales and the most populous city in Australia. It is located on the east coast of Australia and surrounds Sydney Harbour. The metropolis extends from the Pacific Ocean to the Blue Mountains in the west and from the Ku-ring-gai Chase National Park to the Royal National Park in the north and south. Greater Sydney consists of 658 suburbs spread across 33 local government areas. The estimated population is around 5.3 million, making it home to two-thirds of the state's population. "Sydneysiders" is the term commonly used for city residents, who enjoy the nicknames "Emerald City" and "Harbour City."

Auckland: Auckland is a major city in New Zealand, located in the North Island. It has a population of about 1.5 million and is governed by the Auckland Council. The city is known for its multiculturalism, with a significant Asian population and the fourth largest foreign-born community worldwide. Auckland is also home to the largest ethnic Polynesian population globally. Its Māori name, Tāmaki Makaurau, refers to the city's abundant natural resources and appealing geography.

Wellington: Wellington is the capital of New Zealand, located at the south-western tip of the North Island. It is the administrative centre of the Wellington Region and the third-largest city in New Zealand. Known as the world's southernmost capital, Wellington has a temperate maritime climate and holds the title for being the windiest city in the world.

The arts: The arts encompass a wide range of creative expression and cultural participation in various media. They are dynamic and constant in human life, evolving into stylized and intricate forms through study and training. They serve as a vehicle for cultivating distinct identities, transmitting values, and sharing experiences across time and space.

Art: Art is a varied human activity that produces creative and imaginative works. It encompasses technical skill, aesthetic appeal, emotional impact, and conceptual ideas.

Artist: An artist is a person who creates art and practices the arts. It commonly refers to visual arts practitioners, but can also include musicians and performers in the entertainment industry. The term "artiste" is a variant, but rarely used. Writers can also be considered artists, but this is less common and mostly seen in critics' reviews.

Architecture: Architecture is the art and technique of designing and constructing buildings or structures. It involves sketching, planning, and conceiving unique creations. It is rooted in the Latin and Greek words for 'chief creator'. Architectural works are seen as cultural symbols and artistic expressions, defining historical civilizations.

Architectural drawing: An architectural drawing is a technical drawing of a building used by architects and others for various purposes. It helps develop design ideas, communicate concepts, convince clients, assist contractors in construction, record designs, and document existing buildings.

Architectural theory: Architectural theory involves thinking, discussing, and writing about architecture. It is taught in architecture schools and practiced by leading architects. It takes various forms such as lectures, books, and competition entries. Architectural theory has a long history and gained richness with the rise of publishing. The 20th century saw a rapid formation and dissolution of styles and movements. The internet is expected to further enhance architectural discourse in the 21st century.

Landscape architecture: Landscape architecture is the design of outdoor spaces and structures to achieve environmental and aesthetic goals. It involves systematic design and engineering, considering social, ecological, and soil conditions. Various interventions are planned to create desired outcomes.

Sacral architecture: Sacral architecture refers to the design and construction of religious and sacred spaces like churches, mosques, temples, etc. These structures often represent impressive and enduring monolithic buildings created by various cultures. However, sacred architecture can also be non-monolithic, temporary, and intensely personal, providing a space for meta-intimacy and privacy.

Islamic architecture: Islamic architecture refers to the architectural styles of buildings linked to Islam, including both religious and secular structures from the early days until now. It encompasses a broad geographical area, spanning from western Africa and Europe to eastern Asia. While Islamic architectural styles share commonalities across regions, different areas developed their own unique styles based on local materials, techniques, dynasties, patrons, artistic centers, and occasionally religious affiliations.

Proportion (architecture): Proportion in architecture refers to the visual effect created by the relationships between different objects and spaces within a structure. It is a key principle that connects mathematics and art. These relationships are often based on multiples of a standard unit of length called a "module."

Chinese architecture: Chinese architecture is an ancient style that has evolved over centuries and influenced the architecture of East Asian countries. Its structural principles have remained consistent, with decorative details changing over time. Chinese architecture greatly influenced neighboring countries like Japan, Korea, Vietnam, and Mongolia, as well as Southeast and South Asian nations such as Malaysia, Singapore, Indonesia, Sri Lanka, Thailand, Laos, Cambodia, and the Philippines.

Architecture of India: Indian architecture is deeply influenced by the history, culture, and religion of the country. It encompasses various styles such as Hindu temple architecture, Indo-Islamic architecture (including Rajput, Mughal, and Indo-Saracenic), and South Indian architecture. Early structures were made of wood, which did not withstand the test of time. However, surviving examples of Indian architecture include rock-cut structures like Buddhist, Hindu, and Jain temples.

Iranian architecture: Iranian architecture, also known as Persian architecture, encompasses the architectural styles of Iran, West Asia, the Caucasus, and Central Asia. With a history dating back to 5,000 BC, it includes diverse examples found across a vast region from Turkey to Uzbekistan. The range of Persian buildings varies from vernacular structures to grand complexes like palaces and mosques. However, the growth of cities like Tehran has led to the demolishment of historical sites as well as the construction of new ones.

Ancient Egyptian architecture: Ancient Egyptian architecture, spanning over three millennia, was characterized by constant change and split into different periods. It was not defined by one style but rather a collection of styles that evolved over time while sharing some similarities.

Ancient Greek architecture: Ancient Greek architecture, created by the Greeks or Hellenics, spanned from 900 BC to the 1st century AD. Its cultural center was in Greece, including the mainland, Peloponnese, Aegean Islands, and colonies in Anatolia and Italy. The earliest remaining architectural works date back to around 600 BC.

Ancient Roman architecture: Ancient Roman architecture combined elements of classical Greek architecture but evolved into its own distinct style. It thrived during the Roman Republic and Empire, utilizing materials like Roman concrete and innovative techniques such as arches and domes. Many well-engineered structures still exist today across the former empire.

Megalith: A megalith is a large stone used to construct prehistoric structures or monuments. Europe alone has over 35,000 megaliths, found from Sweden to the Mediterranean Sea.

Mesoamerican architecture: Mesoamerican architecture refers to the architectural traditions of pre-Columbian cultures in Mesoamerica, known for their monumental buildings. It encompasses various regional styles that developed through cultural exchange over thousands of years. The notable features are public, ceremonial, and urban structures, with a particular emphasis on pyramids that rival those in Ancient Egypt.

Architecture of Mesopotamia: The architecture of Mesopotamia refers to the ancient buildings and structures in the Tigris-Euphrates region, including urban planning, courtyard houses, and ziggurats. It dates back from the 10th millennium BC to the 6th century BC, and scribes played a significant role as architects for the government, nobility, and royalty.

Byzantine architecture: Byzantine architecture refers to the architectural style of the Byzantine Empire, which existed from 330 AD to 1453. It was initially similar to Roman architecture, with a focus on arches, vaults, and domes. As time passed, Byzantine architecture developed its own distinctive features. Grand buildings often featured wall mosaics with gold backgrounds, while frescos were used as a more affordable alternative. The style was characterized by its scale and use of elaborate decorations.

Gothic architecture: Gothic architecture, prevalent in Europe from the late 12th to the 16th century, evolved from Romanesque architecture and was succeeded by Renaissance architecture. Originating in northern France, it is characterized by pointed arches, ribbed vaults, and flying buttresses. The term "Gothic" was initially used contemptuously during the Renaissance by those seeking to revive classical antiquity.

Renaissance architecture: Renaissance architecture, emerging in the 15th and 16th centuries, revived and developed aspects of ancient Greek and Roman culture. It succeeded Gothic architecture and preceded Baroque architecture. Originating in Florence with Filippo Brunelleschi, it spread throughout Italy and later reached various parts of Europe, impacting each region differently.

Baroque architecture: Baroque architecture is a highly ornate and dramatic style that emerged in Italy in the 17th century. Originally employed by the Catholic Church, it aimed to counter the Reformation by introducing awe-inspiring structures. This style reached its zenith in the High Baroque, prevalent in churches and palaces across Europe. In the Late Baroque, it extended to far-flung regions like Russia and Latin America. Around 1730, an even more elaborately decorative variation known as Rococo emerged in Central Europe.

Romanesque architecture: Romanesque architecture, prevalent in medieval Europe from the 11th to 12th centuries, featured semicircular arches and eventually gave way to Gothic architecture. It emerged simultaneously in various countries, becoming the first pan-European architectural style since Imperial Roman times. The name "Romanesque" also applied to contemporary art of the period.

Modern architecture: Modern architecture, a prominent movement in the second half of the 20th century, embraced new construction technologies, functionalism, minimalism, and rejected ornamentation.

Neoclassical architecture: Neoclassical architecture, also known as Classical Revival, emerged in the mid-18th century in Italy, France, and Germany. It became a dominant style globally and aimed to revive the simplicity and authenticity of ancient Greek and Roman architecture. Neoclassical architecture rejected the extravagances of the Late Baroque period and sought a pure and modern adaptation of classical design.

Postmodern architecture: Postmodern architecture emerged in the late 1950s as a response to the rigidness of modern architecture. It rejected the uniformity and lack of creativity championed by figures like Philip Johnson and Henry-Russell Hitchcock. Denise Scott Brown and Robert Venturi introduced the movement in their 1972 book, "Learning from Las Vegas." Notable architects, including Scott Brown & Venturi, Philip Johnson, Charles Moore, and Michael Graves, showcased this style and it thrived from the 1980s to the 1990s. Afterwards, it fragmented into various new tendencies such as high-tech architecture, neo-futurism, new classical architecture, and deconstructivism. Nevertheless, some buildings constructed later still fall under the postmodern label.

Great Sphinx of Giza: The Great Sphinx of Giza is a limestone statue in Egypt. It has the head of a human and the body of a lion. It faces from west to east on the Giza Plateau. The Sphinx is believed to represent the pharaoh Khafre. Originally carved from bedrock, it has been restored with limestone. It measures 73m long, 20m tall, and 19m wide.

Empire State Building: The Empire State Building is a famous skyscraper in Midtown Manhattan, New York City. Built in 1930-1931, it stands 1,454 feet tall including its antenna. It was once the world's tallest building but is now the seventh-tallest in NYC. The building's Art Deco style and its name derived from New York's nickname, "Empire State," contribute to its iconic status.

Fallingwater: Fallingwater is a renowned house designed by Frank Lloyd Wright in 1935 in Pennsylvania's Laurel Highlands. It is located near Pittsburgh and built over a waterfall on Bear Run. The house was intended as a weekend retreat for Liliane and Edgar J. Kaufmann, owners of Kaufmann's Department Store.

Machu Picchu: Machu Picchu is a 15th-century Inca citadel located in southern Peru, known as the "Lost City of the Incas". It sits on a mountain ridge at an elevation of 2,430 meters and is situated in the Machupicchu District within Urubamba Province. The site is renowned as the iconic symbol of the Inca Empire and is surrounded by a canyon created by the Urubamba River. The name is pronounced differently in various languages, but it typically has a silent 'c' in Picchu.

Statue of Liberty: The Statue of Liberty is a massive neoclassical sculpture on Liberty Island in New York Harbor. It was a gift from the people of France, designed by sculptor Frédéric Auguste Bartholdi and built by Gustave Eiffel. The statue was dedicated in 1886.

Angkor Wat: Angkor Wat is a massive temple complex in Cambodia, renowned for its size and religious significance. It covers 162.6 hectares and is situated within the ancient Khmer capital city of Angkor. The Guinness World Records recognizes it as the largest religious structure worldwide. Originally built as a Hindu temple dedicated to Vishnu by King Suryavarman II in the 12th century, it later transformed into a Buddhist temple. This unique fusion of Hindu and Buddhist elements makes Angkor Wat a remarkable "Hindu-Buddhist" monument.

Borobudur: Borobudur is a 9th-century Buddhist temple in Central Java, Indonesia. It is a Mahayana Buddhist temple located near Magelang Regency and Muntilan.

Burj Khalifa: The Burj Khalifa is a skyscraper in Dubai, UAE. Standing at 829.8 m (2,717 ft), it is the world's tallest structure and building since 2009, surpassing Taipei 101.

Forbidden City: The Forbidden City in Beijing, China, is a palace complex at the center of the Imperial City. It is surrounded by lavish imperial gardens, temples, and parks. The complex is officially administered by the Palace Museum.

Great Wall of China: The Great Wall of China is a historical series of fortifications on the northern borders of ancient Chinese states and Imperial China. It was built to defend against nomadic groups from the Eurasian Steppe. The wall was constructed by various dynasties, starting from the 7th century BC. The most famous sections were built by the Ming dynasty.

Hagia Sophia: Hagia Sophia is a historical site in Istanbul, Turkey. Originally built as an Eastern Orthodox church in 537 AD, it became a Catholic church in 1204 and then reverted to Eastern Orthodox in 1261. After the Ottoman conquest in 1453, it was converted into a mosque and served this purpose until 1935, when it became a museum. In 2020, it was transformed back into a mosque.

Kaaba: The Kaaba, also known as al-Ka'ba al-Musharrafa, is a stone building located at the center of the Masjid al-Haram in Mecca, Saudi Arabia. It is Islam's most important mosque and holiest site. Muslims consider it to be the Bayt Allah (House of Allah) and it serves as the qibla (direction of prayer) for Muslims worldwide.

Kinkaku-ji: Kinkaku-ji, also known as Rokuon-ji, is a Zen Buddhist temple in Kyoto, Japan. It is a highly popular destination, attracting numerous visitors each year. This iconic temple is recognized as a National Special Historic Site and Landscape. Additionally, it is part of the Historic Monuments of Ancient Kyoto, a collection of World Heritage Sites.

Taj Mahal: The Taj Mahal is a marble mausoleum in Agra, Uttar Pradesh, India. Commissioned by Shah Jahan in 1631, it is dedicated to his wife Mumtaz Mahal and also houses his own tomb. The complex spans 17 hectares and includes a mosque and guest house, surrounded by gardens and a protective wall.

Temple Mount: Temple Mount, also called Haram al-Sharif or al-Aqsa Mosque compound, is a significant hill in Jerusalem's Old City. It has been revered as a sacred place for Judaism, Christianity, and Islam for centuries.

Ziggurat of Ur: The Ziggurat of Ur is an ancient structure located in the city of Ur, Iraq. It was built during the Early Bronze Age and later restored in the 6th century BC.

Acropolis of Athens: The Acropolis of Athens is an ancient citadel above the city of Athens, Greece, housing the remains of significant archeological structures, including the renowned Parthenon. The term "acropolis" comes from Greek words meaning "highest point of the city," and there are other similar sites throughout Greece. Historically, the Acropolis of Athens was also known as Cecropia, after Cecrops, the legendary serpent-man and first king of Athens.

Alhambra: The Alhambra is a renowned palace and fortress in Granada, Andalusia, Spain, admired for its Islamic architecture and well-preserved historic significance. Additionally, it showcases remarkable examples of Spanish Renaissance architecture.

Arc de Triomphe: The Arc de Triomphe is a famous monument in Paris, France. Located at the western end of the Champs-Élysées, it stands in the centre of Place Charles de Gaulle. The arc is shared between three arrondissements. It commemorates those who fought and died for France in the Revolutionary and Napoleonic Wars. The inner and outer surfaces are inscribed with the names of victories and generals. It also holds the Tomb of the Unknown Soldier from World War I.

Colosseum: The Colosseum is a massive ancient amphitheatre located in Rome, Italy. It was built during the Flavian dynasty and is the largest of its kind ever constructed. Despite its age, it remains the largest standing amphitheatre in the world. Construction began in 72 AD under Emperor Vespasian and was completed in 80 AD by his successor, Titus. Additional modifications were made during the reign of Domitian. The Colosseum is renowned for its elliptical shape and association with the Flavius family.

Eiffel Tower: The Eiffel Tower, an iconic lattice tower in Paris, France, was designed and constructed by Gustave Eiffel's company between 1887 and 1889.

Florence Cathedral: Florence Cathedral, also known as the Cathedral of Saint Mary of the Flower, is a famous Gothic-style cathedral in Florence, Italy. Construction began in 1296 and was finished in 1436, with its iconic dome engineered by Filippo Brunelleschi. The basilica's exterior features stunning polychrome marble panels in green and pink, bordered by white, and boasts a detailed 19th-century Gothic Revival façade by Emilio De Fabris.

Leaning Tower of Pisa: The Leaning Tower of Pisa, also known as the Tower of Pisa, is a freestanding bell tower situated in Pisa Cathedral Square. It is distinguished by its famous four-degree inclination, caused by an unstable foundation. The tower is part of a trio of structures in the square, alongside the cathedral and Pisa Baptistry.

Kremlin: The Kremlin is a fortified complex in the center of Moscow, known for its five palaces, four cathedrals, and the surrounding Kremlin Wall with towers. It includes the Grand Kremlin Palace, once the residence of the Russian emperor in Moscow. Today, it serves as the official residence of the Russian president and welcomes millions of visitors as a museum. The Kremlin offers stunning views of the Moskva River, Saint Basil's Cathedral, Red Square, and Alexander Garden.

Notre-Dame de Paris: The Notre-Dame de Paris cathedral, known as Notre-Dame, is a medieval Catholic cathedral located on the Île de la Cité in Paris, France. It is a prime example of French Gothic architecture, dedicated to the Virgin Mary. Notably, it introduced the rib vault and flying buttress, featured colorful rose windows, and showcased realistic sculptures. The cathedral is distinguished by its three pipe organs and massive church bells.

Palace of Versailles: The Palace of Versailles, commissioned by King Louis XIV, is a former royal residence situated in Versailles, France, about 19 kilometers west of Paris.

Palace of Westminster: The Palace of Westminster, also known as the Houses of Parliament, is the meeting place of the UK Parliament and a significant center of political life in the country. Located in London, England, it consists of the House of Commons and the House of Lords. The iconic Elizabeth Tower, commonly known as Big Ben, is part of the palace and a famous landmark. The palace is an important symbol of the British government and is listed as a Grade I building and a UNESCO World Heritage Site.

Pantheon, Rome: The Pantheon in Rome is an ancient Roman temple and currently a Catholic church. Built on the site of an earlier temple commissioned by Marcus Agrippa, it was later rebuilt by Emperor Hadrian in around AD 126. The exact construction date is unknown as Hadrian retained the inscription of the previous temple.

Parthenon: The Parthenon, an ancient Greek temple on the Athenian Acropolis, was dedicated to Athena in the 5th century BC. It showcases exquisite sculptures and is a symbol of Ancient Greece, democracy, and Western civilization.

Sagrada Família: The Sagrada Família is a church in Barcelona, Spain, designed by architect Antoni Gaudí. It is the largest unfinished Catholic church in the world and is part of a UNESCO World Heritage Site. Pope Benedict XVI consecrated the church in 2010.

St. Peter's Basilica: St. Peter's Basilica is a church in Vatican City, Rome, built in the Italian Renaissance style. It was planned in the 15th century and completed in 1626, replacing the old basilica built by Constantine the Great.

Stonehenge: Stonehenge is a prehistoric monument in Wiltshire, England. It consists of a ring of large vertical sarsen stones with connecting lintel stones. Inside is a ring of smaller bluestones and free-standing trilithons. The monument is aligned with the solstices and surrounded by other ancient structures.

Sydney Opera House: The Sydney Opera House is a renowned performing arts centre in Sydney, Australia. It is located on the Sydney Harbour and is recognized as a global icon of distinctive and exceptional 20th-century architecture.

Seven Wonders of the Ancient World: The term 'Seven Wonders of the Ancient World' refers to a list of notable structures from classical antiquity. It is the earliest known list, dating back to the 2nd–1st century BC.

Great Pyramid of Giza: The Great Pyramid of Giza, the largest Egyptian pyramid, was the tomb of pharaoh Khufu. It was built in the early 26th century BC and is the oldest of the Seven Wonders of the Ancient World. As part of the Giza pyramid complex, it is situated at the northern end of a line of three pyramids.

Movie theater: A movie theater, also known as cinema or theater, is a commercial venue where people buy tickets to watch films on a big screen. It provides auditoria for public entertainment, catering to a wide audience.

Museum: A museum is an institution that displays and preserves culturally significant objects. It typically has exhibits open to the public and may also have private collections for researchers. Museums cover a wide range of topics, including arts, science, history, and attract millions of visitors, making them popular tourist attractions.

American Museum of Natural History: The American Museum of Natural History (AMNH) is a renowned museum in New York City, located on the Upper West Side. It houses 45 permanent exhibition halls, a planetarium, and a library. The museum showcases a vast collection of over 35 million specimens, including plants, animals, fossils, minerals, rocks, and cultural artifacts. With more than 2.5 million square feet of space, it is one of the largest museums in the world. AMNH employs a team of 225 scientists, conducts numerous field expeditions, and attracts around five million visitors annually.

Metropolitan Museum of Art: The Metropolitan Museum of Art, also known as the Met, is the largest art museum in the Americas and fourth-largest worldwide.

Museum of Modern Art: The Museum of Modern Art (MoMA) is an art museum located in Midtown Manhattan, New York City. It was founded in 1929 and is America's first museum solely dedicated to modern art. The museum's collection quickly grew under the leadership of A. Conger Goodyear and Alfred H. Barr Jr. who organized an initial exhibition featuring European modernists. Despite facing financial challenges and resistance from John D. Rockefeller Jr., the museum eventually found a permanent site on 53rd Street between Fifth and Sixth Avenues, thanks to a donation of land by Rockefeller.

National Gallery of Art: The National Gallery of Art is a renowned art museum in Washington, D.C., USA, located on the National Mall. Founded in 1937, it was established for the American people through a joint resolution of Congress. Andrew W. Mellon generously contributed a substantial art collection and funds for the museum's construction. The gallery's core collection includes significant works donated by various art patrons, showcasing Western art from the Middle Ages to the present. It holds the only Leonardo da Vinci painting in the Americas and the largest mobile by Alexander Calder. Admission is free for the public.

Smithsonian Institution: The Smithsonian Institution, or simply the Smithsonian, is the largest group of museums, education and research centers in the world. It was created by the U.S. government in 1846 to increase and spread knowledge. It operates as a trust instrumentality and is not officially part of the federal government. The institution is named after James Smithson, its founding donor. Originally known as the United States National Museum, it underwent administrative changes in 1967.

National Museum of China: The National Museum of China is China's primary museum, located near Tiananmen Square in Beijing. Its purpose is to educate visitors about Chinese arts and history. Funded by the Ministry of Culture and Tourism, it serves as a level-1 public welfare institution.

National Palace Museum: The National Palace Museum in Taipei, Taiwan is a renowned museum with a vast collection of around 700,000 Chinese artifacts and artworks. Many of these treasures were brought from mainland China during the retreat of the Republic of China. The museum was established in 1965 in its current location in Shilin, Taipei. It is one of the largest museums of its kind globally, and it also has a southern branch in Taibao, Chiayi.

Hermitage Museum: The Hermitage Museum in Saint Petersburg, Russia, is a renowned art and culture museum founded in 1764. It was established by Empress Catherine the Great after acquiring a collection of paintings from Johann Ernst Gotzkowsky. The museum has been open to the public since 1852 and celebrates its founding on Saint Catherine's Day each year. With its rich history and impressive collection, it ranks 10th in The Art Newspaper's list of the most visited art museums, attracting 2,812,913 visitors in 2022.

British Museum: The British Museum is a globally renowned public museum in London's Bloomsbury district. It houses the world's largest permanent collection with eight million works spanning human history, art, and culture. From ancient times to the present, it chronicles the evolution of human culture. Being the first national museum of its kind, it embraces diverse fields of knowledge.

National Gallery: The National Gallery is an art museum in London, England, founded in 1824. It is located in Trafalgar Square and houses over 2,300 paintings from the 13th century to 1900. The current Director is Gabriele Finaldi.

Natural History Museum, London: The Natural History Museum in London showcases a wide array of specimens from different branches of natural history. Located on Exhibition Road in South Kensington, it shares the area with the Science Museum and the Victoria and Albert Museum. Although its main entrance is on Cromwell Road.

Tate Modern: Tate Modern is a renowned London art gallery that houses the UK's national collection of modern and contemporary art, ranging from the year 1900 onwards. It is situated in the former Bankside Power Station, in Southwark's Bankside area, and is part of the Tate group, encompassing Tate Britain, Tate Liverpool, and Tate St Ives.

Louvre: The Louvre, also known as the Louvre Museum, is a famous national art museum in Paris, France, located on the Right Bank of the Seine River. It houses iconic works of Western art like the Mona Lisa and the Venus de Milo. The museum is situated in the historic Louvre Palace, which was originally built in the 12th to 13th century. The palace's medieval fortress remnants can be seen in the museum's basement. Over time, the fortress lost its defensive role and was transformed by Francis I into the primary residence of French Kings in 1546.

Musée National d'Art Moderne: The Musée National d'Art Moderne is a national museum in France dedicated to modern art. It is located in Paris within the Centre Pompidou. Ranked 10th in the world's most visited art museums in 2021, it attracts over 1.5 million visitors and boasts a vast collection of modern and contemporary artworks.

Museo del Prado: The Museo del Prado, also called Prado Museum, is Spain's main national art museum located in central Madrid. It houses an exceptional collection of European art spanning from the 12th to the early 20th century, including the finest Spanish art. Founded in 1819, it offers not only paintings and sculptures but also other valuable works. The Prado Museum is one of the world's most visited and renowned art museums, with masterpieces by celebrated artists such as Goya, Bosch, El Greco, Rubens, Titian, and Velázquez. Velázquez played a significant role in acquiring the museum's large collection of Italian masters.

Rijksmuseum: The Rijksmuseum is the national museum of the Netherlands, situated in Amsterdam's Museum Square. It is dedicated to Dutch arts and history. Nearby are the Van Gogh Museum, the Stedelijk Museum Amsterdam, and the Concertgebouw.

Uffizi: The Uffizi Gallery is a renowned art museum in Florence, Italy. It is one of the largest and most important Italian museums, known for its collection of priceless works from the Italian Renaissance. Located near the Piazza della Signoria, it is highly visited and recognized worldwide.

Vatican Museums: The Vatican Museums in Vatican City display a vast collection of art amassed by the Catholic Church and the papacy throughout the centuries. They house famous Roman sculptures and Renaissance masterpieces and have approximately 70,000 works, with 20,000 on display. The museums employ 640 people across various departments.

Literature: Literature encompasses written works, including prose, fiction, drama, and poetry, both in print and digital form. It also includes oral literature, known as orature, which has been transcribed. Literature serves as a means of recording, preserving, and transmitting knowledge and entertainment. It can also hold social, psychological, spiritual, or political significance.

Literary criticism: Literary criticism is the evaluation and interpretation of literature. It is influenced by literary theory, which analyzes the goals and methods of literature. Critics are not always theorists, though the two are closely related.

Prose: Prose is a written or spoken language that resembles natural speech, adheres to ordinary grammatical structures, and conforms to formal academic writing conventions. It is distinct from poetry, which relies on rhythmic meter and rhyme. The word "prose" emerged in the 14th century from Old French and Latin expressions.

Writer: A writer is someone who uses written words in various styles, genres, and techniques to communicate ideas, evoke emotions, and entertain. They create diverse forms of writing, such as novels, short stories, plays, songs, and essays, which are published across various media. Skilled writers contribute greatly to a society's cultural content by effectively expressing ideas through language.

Novel: A novel is a long work of fiction written in prose and published as a book. It has a history of about two thousand years, originating from Ancient Greek and Roman novels, Medieval Chivalric romance, and Italian Renaissance novellas. Some authors use the term "romance" instead of novel. The novel typically presents a realistic depiction of society, while romance emphasizes extraordinary events. Examples of novels include Frankenstein, The Lord of the Rings, and To Kill a Mockingbird. Romance novels, focusing on romantic love, should not be confused with this broader definition.

Short story: A short story is a brief piece of prose fiction that aims to create a specific mood or effect. It can be read in one sitting and often focuses on a self-contained incident or a series of linked incidents. Short stories have a long history and have existed in various forms, such as legends, mythic tales, and folk tales. The modern short story as we know it today emerged in the early 19th century.

Poetry: Poetry, or verse, is a literary form that utilizes aesthetic and rhythmic language to convey additional meanings beyond its literal interpretation. It incorporates elements like phonaesthetics, sound symbolism, and metre. Poems are written compositions by poets who adhere to these principles.

Epic poetry: An epic poem is a lengthy narrative about extraordinary characters who shape the mortal universe through their extraordinary deeds and interactions with gods or superhuman forces.

Ghazal: The ghazal is a type of love poem that originated in Arabic poetry. It typically expresses the anguish of separation from a loved one and the enduring beauty of love.

Haiku: Haiku is a Japanese short form poetry with three phrases and a 5-7-5 pattern. It includes a cutting word and a seasonal reference. Variations that don't follow these rules are classified as senryū.

Ode: An ode is a form of lyric poetry that praises or glorifies an event or individual, while combining intellectual and emotional descriptions of nature. It is typically structured in three parts: strophe, antistrophe, and epode. Various forms, such as the homostrophic ode and irregular ode, are also used.

Prose poetry: Prose poetry: Poetry written in prose, not verse, with key elements of vivid imagery, parataxis, and emotional impact.

Rhyme: A rhyme is a repetition of similar sounds in the stressed syllables of two or more words, often used for musical or aesthetic purposes in poetry or songs. It can also refer to other similar sounds at the end of words. Additionally, the term "rhyme" is sometimes used as a shorthand for brief poems like nursery rhymes.

Sonnet: A sonnet is a poetic form that originated in the Court of Frederick II in Palermo. It was invented by Giacomo da Lentini and spread to the mainland by the Sicilian School of poets. The original Sicilian language sonnets have been lost, but they were later translated into Tuscan dialect.

Fiction: Fiction is any creative work portraying imaginary individuals, events, or places. It includes written narratives like novels, as well as theatrical performances, films, TV shows, comics, and video games. Fictional stories are distinct from history and fact, exploring imaginary possibilities.

Children's literature: Children's literature refers to stories, books, magazines, and poems specifically designed for children. It is classified based on genre or the intended age of the reader. This classification ranges from picture books for young children to young adult fiction for older readers.

Fable: A fable is a short fictional story that teaches a moral lesson through the use of animals, plants, or inanimate objects that have human-like qualities. The moral lesson is often stated explicitly at the end of the story.

Fairy tale: A fairy tale is a short story with magical elements and fanciful beings that belong to the folklore genre. They are part of literature in preliterate societies, combining myths, folktales, and fairy tales. Fairy tales differ from legends, moral tales, and beast fables, and commonly include dragons, elves, giants, witches, and magical elements like talking animals and enchantments.

Fictional universe: A fictional universe is an internally consistent setting found in fantasy and science fiction works. It appears in various forms of media such as novels, comics, films, TV shows, video games, and art.

Romance novel: A romance novel, also known as a romantic novel, is a type of genre fiction that revolves around the romantic relationship and love between two individuals. These novels typically end with an emotionally satisfying and optimistic conclusion. Renowned authors such as Samuel Richardson, Jane Austen, and Charlotte Brontë have made significant contributions to the development of this popular genre.

Legend: A legend is a type of folklore narrative believed to be set in human history, showcasing human actions and values. It often incorporates miracles and evolves over time to remain relevant.

Saga: Sagas are historical prose stories originating from Iceland and Scandinavia, containing vital narratives and histories.

Satire: Satire is a genre of arts that uses humor to criticize and expose flaws in individuals, corporations, government, or society. It can take the form of fiction or non-fiction and aims to bring about constructive social criticism and improvement.

Black comedy: Black comedy, also called dark comedy, is a form of humor that finds amusement in unconventional, taboo or sensitive subjects. It is often used by writers and comedians to elicit discomfort and provoke deep thought while providing laughter. In fiction, black comedy is a genre characterized by its prominent use of dark humor.

Detective fiction: Detective fiction is a subgenre of crime and mystery fiction. It revolves around an investigator, whether professional, amateur, or retired, who delves into crimes, often murder. This genre emerged in the mid-nineteenth century, alongside speculative and other genre fiction. It is still immensely popular, especially in novels. Notable detective heroes include C. Auguste Dupin, Sherlock Holmes, and Hercule Poirot. Juvenile stories featuring The Hardy Boys, Nancy Drew, and The Boxcar Children have also enjoyed long-term publication success.

Fantasy: Fantasy is a genre of fiction based on mythical or folkloric elements, often set in an imagined world. It includes magical elements and can encompass various forms of artistic expression.

Horror fiction: Horror fiction is a genre of disturbing and frightening fiction that aims to scare or disturb readers. It is divided into sub-genres like psychological and supernatural horror. These stories create an unsettling atmosphere and often use metaphors to reflect society's fears.

Science fiction: Science fiction is a speculative genre that explores imaginative and futuristic concepts involving advanced science, space exploration, time travel, parallel universes, and alien life. It is related to fantasy, horror, and superhero fiction, and encompasses various subgenres. Its definition has been disputed by authors, critics, scholars, and readers.

Time travel: Time travel is the theoretical concept of traveling into the past or future. It is a well-known idea in philosophy and science fiction, often achieved through a fictional device called a time machine. The notion of a time machine was introduced by H. G. Wells in his 1895 novel The Time Machine.

Non-fiction: Non-fiction refers to any document or media content that strives to provide information about the real world. It aims to present subjects objectively based on historical, scientific, and empirical data. While generally factual, non-fiction also includes subjective perspectives and opinions on real-world matters.

Biography: A biography, also known as a bio, is a detailed account of someone's life, going beyond basic facts and including personal experiences, relationships, and analysis of their personality. It portrays a person's life story, emphasizing different aspects and intimate details.

Diary: A diary is a written or digital record of personal experiences, thoughts, and feelings arranged by date. Diaries can be handwritten or digital and are kept by diarists. They serve various purposes in human civilization, including government, business, and military records. In British English, the word can also refer to a preprinted journal format.

Essay: An essay is a written piece of work presenting the author's argument. It shares similarities with letters, papers, articles, pamphlets, and short stories. Essays can be classified as either formal or informal. Formal essays exhibit seriousness, organization, and length, while informal essays showcase personal elements, humor, style, and unconventional themes.

Dictionary: A dictionary is a reference book that lists words from one or more languages in alphabetical order. It provides definitions, usage examples, etymologies, pronunciations, and translations, among other information. It serves as a comprehensive tool to understand relationships between words.

Encyclopedia: An encyclopedia is a compendium of knowledge organized into articles or entries, typically alphabetically or by categories. It provides detailed and factual information about various subjects, unlike dictionaries which focus on linguistic aspects. Encyclopedia entries are longer and more comprehensive than dictionary entries, offering summaries of knowledge in a specific field. They can be accessed through hyperlinks and search functions.

Thesaurus: A thesaurus is a reference work that organizes words by their meanings, providing lists of synonyms and antonyms. It helps writers find the most suitable words to express their ideas accurately and precisely.

Narrative: A narrative is an account of related events or experiences, both real or fictional. It can be conveyed through words, images, or a combination of both. The term originates from the Latin word for 'to narrate', and it is a fundamental aspect of storytelling. Narration is one of the four traditional modes of discourse, along with argumentation, description, and exposition. Various techniques, notably in literature, are employed to construct and enhance narratives.

Character (arts): A character in fiction is a person or being in a story, either fictional or based on a real person. The concept originates from the Greek word χαρακτήρ and gained popularity from its appearance in Tom Jones by Henry Fielding in 1749. Characters are portrayed by actors in theater or cinema, creating the illusion of being a human person. In literature, characters help readers understand plots and contemplate themes. "In character" refers to an effective impersonation by an actor, and the creation of characters is known as characterization in the art of acting or writing.

Superhero: A superhero is a character with superpowers who wears a costume to conceal their identity and uses their abilities to protect the public, fight crime, and make the world a better place. Superhero fiction is a genre that focuses on these characters, commonly found in American comic books since the 1930s and Japanese media.

African literature: African literature refers to both oral and written works in African and Afro-Asiatic languages. It includes pre-colonial literature dating back to the 4th century AD, with the Kebra Negast being a prominent example.

Ancient Egyptian literature: Ancient Egyptian literature, the world's earliest literature, was written in the Egyptian language during ancient Egypt's pharaonic period until Roman domination. It is the oldest surviving body of Egyptian literature, alongside Sumerian literature.

Ancient Greek literature: Ancient Greek literature refers to writings in the Ancient Greek language from the earliest texts until the Byzantine Empire. It includes the famous epic poems the Iliad and the Odyssey, along with other important works like the Homeric Hymns and the writings of Hesiod. These texts laid the foundation for the Greek literary tradition, which persisted through the Classical, Hellenistic, and Roman eras.

Arabic literature: Arabic literature refers to written works in the Arabic language, encompassing prose and poetry. The term "Adab" is used for literature, reflecting etiquette, culture, and enrichment.

Chinese literature: Chinese literature, spanning thousands of years, includes court archives, vernacular fiction, and baihua literature. Woodblock printing in the Tang dynasty and movable type printing in the Song dynasty facilitated the spread of written knowledge. Lu Xun is regarded as a significant figure in modern Chinese literature.

English literature: English literature is a body of works written in English, evolving over 1,400 years. It began with Old English, brought to Britain by Anglo-Saxon invaders. Beowulf is a famous early work. After the Norman conquest, French became dominant, but Middle English emerged in the 11th century. Geoffrey Chaucer's The Canterbury Tales helped establish Middle English. The printing press and the King James Bible standardized the language. The Great Vowel Shift also played a role in shaping English literature.

French literature: French literature refers to writings in the French language by citizens of France and other French-speaking territories. It can also include literature by individuals living in France who speak regional languages. Works written in French by citizens of other countries like Belgium, Switzerland, Canada, and various African nations are known as Francophone literature.

German literature: German literature refers to texts written in German, encompassing works from Germany, Austria, Switzerland, Belgium, Liechtenstein, Luxembourg, South Tyrol, and the German diaspora. While primarily in Standard German, some literature is influenced by dialects.

Indian literature: Indian literature refers to writings created in the Indian subcontinent before 1947, and in the Republic of India after that. The Constitution of India recognizes 22 languages, and the Sahitya Akademi, India's top literary authority, recognizes 24 literary languages.

Italian literature: Italian literature refers to written works in the Italian language, both within Italy and abroad. It encompasses literature written by Italians and in languages spoken in Italy, including regional varieties and vernacular dialects.

Japanese literature: Japanese literature has been shaped by interactions with neighboring Asian literatures, especially China. Early texts were written in Classical Chinese or a Chinese-Japanese mix. Indian literature also influenced Japanese writing through the spread of Buddhism.

Jewish literature: Jewish literature encompasses writings by Jews on Jewish themes as well as works in Jewish languages. It includes ancient and medieval literature, such as the Bible and rabbinic texts, as well as ethical, philosophical, and mystical writings. Jewish literature expanded in modern times with the rise of secular Jewish culture, producing Yiddish, Ladino, Hebrew, and Jewish American literary traditions.

Latin American literature: Latin American literature refers to the oral and written works in languages like Spanish, Portuguese, and indigenous dialects. It gained global recognition in the latter half of the 20th century, largely due to magical realism. This literary movement, known as the Latin American Boom, is closely associated with renowned author Gabriel García Márquez. The literature has a long and diverse history, spanning many centuries.

Latin literature: Latin literature refers to writings in the Latin language, including essays, histories, poems, plays, and other forms. It began around 240 BC with the first Latin stage play in Rome and thrived for six centuries. The classical era of Latin literature can be divided into Early Latin literature, The Golden Age, The Imperial Period, and Late Antiquity.

Persian literature: Persian literature is one of the oldest in the world, consisting of oral and written works in the Persian language. Its origins lie in Greater Iran, including present-day Iran, Iraq, Afghanistan, and Turkey. It has also influenced regions in Central Asia, South Asia, and the Balkans. Persian literature encompasses various genres and has been written by diverse ethnic groups in addition to Persians. Notable poets like Rumi contributed to its rich legacy, and Persian was adopted as the court language by empires like the Ghaznavids. Works in languages other than Persian, such as Greek and Arabic, are sometimes included.

Russian literature: Russian literature refers to the literary works of Russia and Russian-speaking authors. It has its roots in the Middle Ages with epics and chronicles in Old East Slavic. During the Age of Enlightenment, Russian literature gained importance and underwent a remarkable golden age in poetry, prose, and drama from the early 1830s. Romanticism allowed for a flourishing of poetic talent, with notable figures like Vasily Zhukovsky and Alexander Pushkin emerging. Prose also thrived, with authors like Mikhail Lermontov, Nikolai Gogol, Ivan Turgenev, Fyodor Dostoevsky, and Leo Tolstoy gaining international renown. The Silver Age of Russian poetry in the early 20th century saw the rise of renowned poets like Konstantin Balmont, Anna Akhmatova, and Vladimir Mayakovsky. This era also produced exceptional novelists and short-story writers such as Ivan Bunin, Leonid Andreyev, and Maxim Gorky.

Scandinavian literature: Scandinavian literature refers to the literature in the Nordic countries of Northern Europe, including Denmark, Finland, Iceland, Norway, Sweden, and associated autonomous territories. It predominantly uses North Germanic languages, although Finland has a Uralic language. Finnish history and literature have close ties with Sweden and Norway, with shared control and significant Sami influences.

Spanish literature: Spanish literature refers to works written in the Spanish language within the Kingdom of Spain. It is influenced by Catalan, Galician, Latin, Jewish, and Arabic literary traditions. Additionally, Spanish literature in America has its distinct features, dating back to the early years of Spain's conquest.

Anabasis(Xenophon): 'Anabasis' is a renowned work by Xenophon, an Ancient Greek soldier and writer. It recounts the journey of the Ten Thousand, a group of Greek mercenaries hired by Cyrus the Younger to assist him in claiming the Persian throne from his brother, Artaxerxes II, in 401 BC.

Analects: The Analects, also known as the Sayings of Confucius, is an ancient Chinese philosophical text composed of sayings and ideas attributed to Confucius and his contemporaries. It was traditionally believed to have been compiled by his followers. Scholars agree that it was written during the Warring States period and reached its final form in the mid-Han dynasty. Initially considered a commentary, the Analects later became one of the central texts of Confucianism.

Apology(Plato): The Apology, written by Plato, is a speech in which Socrates defends himself during his trial for impiety and corruption in 399 BC. This Socratic dialogue delves into his legal self-defense.

The Art of War: "The Art of War" is an ancient Chinese military treatise by Sun Tzu, dating back to the late Spring and Autumn Period. Consisting of 13 chapters, it explores various aspects of warfare and military strategy. Its influence spans over 1,500 years, as it was included in the Seven Military Classics anthology. This text continues to be highly regarded in East Asian and Western military theory, as well as in non-military realms like espionage, culture, politics, business, and sports.

I Ching: The I Ching, also known as the Book of Changes, is an ancient Chinese divination text that dates back to the Western Zhou period. Initially used for divination, it later transformed into a cosmological text with philosophical commentaries called the "Ten Wings". It became a part of the Chinese Five Classics and influenced divination practices in the Far East for centuries. Additionally, it played a significant role in shaping Western understanding of East Asian philosophical thought during the 18th to 20th centuries.

Metaphysics(Aristotle): Metaphysics is a significant work by Aristotle that introduces the concept of First Philosophy. It covers diverse topics like substance theory, different types of causation, form and matter, the existence of mathematical objects, and the cosmos. This compilation laid the foundation for what is now recognized as the branch of philosophy called metaphysics.

Nicomachean Ethics: The Nicomachean Ethics is Aristotle's famous work on ethics, exploring the science of the good for human life and the ultimate goal of our actions. Divided into ten books, it is closely tied to Aristotle's Eudemian Ethics and plays a crucial role in unraveling his ethical philosophy.

Organon: The Organon is Aristotle's collection of six works on logical analysis and dialectic. It was named "an instrument" of Philosophy by Aristotle's followers, the Peripatetics, who defended it against the Stoics.

Dead Sea Scrolls: The Dead Sea Scrolls, also known as the Qumran Caves Scrolls, are ancient Jewish manuscripts discovered between 1946 and 1956 near the Dead Sea. Dating from the 3rd century BCE to the 1st century CE, they are the oldest surviving manuscripts of biblical books and include other religious texts. These scrolls shed light on the history of archaeology, late Second Temple Judaism, and the emergence of Christianity. Most of the 15,000 scrolls are held in the Shrine of the Book at the Israel Museum in Jerusalem. Ownership of the scrolls is contested by Jordan and the Palestinian Authority, while Israel claims them based on historical and religious grounds.

Euclid'sElements: Euclid's Elements is a collection of 13 mathematical books written by the ancient Greek mathematician Euclid around 300 BC. These books provide definitions, postulates, propositions, and mathematical proofs, covering various topics such as Euclidean geometry, number theory, and incommensurable lines. Elements is the oldest surviving comprehensive deductive treatment of mathematics and has greatly influenced the development of logic and modern science. Its logical rigor was only surpassed in the 19th century.

Hippocratic Corpus: The Hippocratic Corpus is a collection of 60 early Ancient Greek medical works associated with the physician Hippocrates. It covers diverse aspects of medicine, including medical theories, ethical practices, and treatment of illnesses. The authorship is mostly unknown, but Hippocrates played a significant role. His teachings blended healing art and scientific observations, laying the foundation for Western medical practice.

Histories(Herodotus): The Histories of Herodotus is a significant work in Western literature, often hailed as the foundation of history. While not entirely unbiased, it is a vital source for understanding historical events. It not only introduced the genre of history but also pioneered its study in the Western world.

History of the Peloponnesian War: The History of the Peloponnesian War is a renowned historical account penned by Thucydides, an Athenian historian and general. It explores the conflict fought between the Peloponnesian League and the Delian League. This classic work is hailed as one of the earliest scholarly works in history and is divided into eight books.

Republic(Plato): The 'Republic' is a dialogue written by Plato in 375 BC, examining justice, the characteristics of a just city-state, and the just individual. This influential work provides deep insights into philosophy and political theory.

Septuagint: The Septuagint, also known as the Greek Old Testament or The Translation of the Seventy, is the earliest surviving Greek translation of the Hebrew Bible. It was translated by seventy-two Hebrew translators, six from each of the Twelve Tribes of Israel, at the request of Ptolemy II Philadelphus.

The Book of Healing: 'The Book of Healing' is an encyclopedia written by Abu Ali ibn Sīna from medieval Persia. It was composed between 1014 and 1020 and published in 1027. This scientific and philosophical work serves as a comprehensive reference, covering various disciplines.

The Consolation of Philosophy: "The Consolation of Philosophy" is a philosophical work written by Boethius during his imprisonment in 523. It is considered the last great Western work of the Classical Period and has influenced philosophy in late antiquity, as well as Medieval and early Renaissance Christianity.

The Incoherence of the Philosophers: "The Incoherence of the Philosophers" is an influential 11th-century work by al-Ghazali, critiquing the Avicennian school of Islamic philosophy for its adherence to Greek philosophy which the author believes contradicts Islam. It denounces influential Muslim philosophers like Avicenna and Alpharabius. The book's success marked a significant milestone in the rise of the Asharite school in Islamic philosophy and theology.

Muqaddimah: The Muqaddimah is a book written by Arab historian Ibn Khaldun in 1377. It offers a comprehensive view of universal history and encompasses various disciplines such as sociology, demography, and cultural history. Additionally, it explores Islamic theology, historiography, the philosophy of history, economics, political theory, and ecology. Some scholars consider it as a precursor to social Darwinism and Darwinism.

Summa Theologica: The Summa Theologica is Thomas Aquinas' best-known work, serving as a comprehensive guide to Catholic theology. It covers various topics such as God, creation, humanity, Christ, and the sacraments. The book presents logical reasoning for nearly all points of Christian theology, making it essential for theology students and those interested in deepening their understanding of the Catholic Church's teachings.

Vulgate: The Vulgate is a 4th-century Latin Bible translation referred to as the Latin Vulgate.

Critique of Pure Reason: The Critique of Pure Reason is a book by Immanuel Kant that explores the limits and scope of metaphysics. It is known as Kant's "First Critique" and was followed by two more critiques. Kant aims to determine if metaphysics is possible or impossible and he defines "critique" as a systematic analysis, not the colloquial meaning of criticism.

De revolutionibus orbium coelestium: De revolutionibus orbium coelestium is the groundbreaking book by Nicolaus Copernicus, presenting the heliocentric theory. Published in 1543, it provided an alternative model to the widely accepted geocentric system proposed by Ptolemy.

A Dictionary of the English Language: The term 'A Dictionary of the English Language' refers to a influential dictionary written by Samuel Johnson in 1755. This dictionary is commonly known as Johnson's Dictionary and is considered a significant work in the history of the English language. It was published on April 15th and remains influential to this day.

Discourse on the Method: The 'Discourse on the Method' is a philosophical and autobiographical work published by René Descartes in 1637. It is famous for introducing the quote "Je pense, donc je suis" (I think, therefore I am). Similar arguments can be found in Descartes' other works such as 'Meditations on First Philosophy' and 'Principles of Philosophy'.

Encyclopædia Britannica: The Encyclopædia Britannica is a widely-known general knowledge English-language encyclopaedia that has been published by Encyclopædia Britannica, Inc. since 1768. It has had multiple owners and is currently maintained by around 100 full-time editors and over 4,000 contributors. The last printed edition was released in 2010, consisting of 32 volumes and 32,640 pages. Since 2016, it has been exclusively available as an online encyclopaedia.

Gutenberg Bible: The Gutenberg Bible, also called the 42-line Bible or B42, was Europe's first major book printed using mass-produced metal movable type. It kickstarted the "Gutenberg Revolution" and introduced printed books in the Western world. This highly valued and revered book is known for its aesthetic beauty, artistic qualities, and historical importance.

The History of the Decline and Fall of the Roman Empire: The History of the Decline and Fall of the Roman Empire is a six-volume work by Edward Gibbon, an English historian. It covers the peak of the Roman Empire, the history of early Christianity, the rise and fall of the Roman State Church, and events like the emergence of Genghis Khan and Tamerlane. The book discusses the decline of the Roman Empire, the fall of Byzantium, and explores the ruins of Ancient Rome.

King James Version: The King James Version (KJV) is an Early Modern English translation of the Christian Bible, commissioned by King James VI and I in 1604 and published in 1611. It includes 80 books, consisting of 39 books from the Old Testament, 14 books of Apocrypha, and 27 books from the New Testament.

Leviathan(Hobbes book): "Leviathan" is a book written by Thomas Hobbes in 1651, during the English Civil War. It examines the structure of society and the importance of legitimate government. Often referred to as one of the earliest and most influential works of social contract theory, the book argues for the need of a strong, undivided government to prevent civil war and chaotic state of nature. Its name is derived from the biblical creature Leviathan.

Ninety-five Theses: The Ninety-five Theses were written by Martin Luther in 1517, challenging the Catholic Church's practice of selling indulgences. These propositions launched the Protestant Reformation, criticizing corruption and abuse by Catholic clergy. Indulgences were certificates that supposedly reduced punishment in purgatory for sins.

Philosophiæ Naturalis Principia Mathematica: The 'Philosophiæ Naturalis Principia Mathematica' or simply the 'Principia' is a book written by Isaac Newton. It explains Newton's laws of motion and law of universal gravitation. Published on 5 July 1687, it consists of three volumes written in Latin.

Popol Vuh: 'Popol Vuh' is an important text that tells the mythology and history of the Kʼicheʼ people in Guatemala and other Maya populations inhabiting regions of Mexico, Belize, Honduras, and El Salvador.

The Prince: "The Prince" is a 16th-century political treatise by Niccolò Machiavelli, serving as an instruction guide for new rulers. It asserts that immoral actions are justified if they lead to political success.

The Wealth of Nations: 'The Wealth of Nations' is a renowned book by economist Adam Smith, published in 1776. Considered a foundational work in classical economics, it explores the factors that contribute to a nation's wealth. Smith delves into topics like division of labor, productivity, and free markets, providing early insights during the Industrial Revolution.

The Communist Manifesto: "The Communist Manifesto" is a political pamphlet written by Karl Marx and Friedrich Engels. Published in 1848, it outlines the core idea that the history of society is a history of class struggles. It defines social classes based on people's relationship to the means of production. This influential document was published during a time of revolts and its repression across Europe.

Das Kapital: 'Das Kapital' is a foundational text in materialist philosophy and critique of political economy, written by Karl Marx and published in three volumes between 1867 and 1894. It analyzes capitalism and applies Marx's theory of historical materialism to reveal the economic laws of modern society. The second and third volumes were completed and published by Friedrich Engels after Marx's death. It is the most cited pre-1950 book in the social sciences.

Encyclopédie: The Encyclopédie is a general encyclopedia published in France from 1751 to 1772. It covers a wide range of subjects in sciences, arts, and crafts. It had multiple writers, known as Encyclopédistes, and was edited by Denis Diderot and Jean le Rond d'Alembert until 1759.

The General Theory of Employment, Interest and Money: 'The General Theory of Employment, Interest and Money' is a groundbreaking book by economist John Maynard Keynes, published in 1936. It revolutionized economic thought by establishing macroeconomics as a central aspect of economic theory and introducing key terms of the "Keynesian Revolution." This seminal work also had a significant impact on economic policy, advocating for government spending, budget deficits, monetary intervention, and counter-cyclical policies. It reflects a skepticism towards the rationality of decision-making in free-market systems.

The Golden Bough: The Golden Bough is a comprehensive study by Sir James George Frazer, exploring mythology and religion across cultures. It was published in volumes in the late 19th and early 20th centuries and has influenced European literature and thought. The book caters to a wide audience and its impact is significant.

On the Origin of Species: 'On the Origin of Species' is a groundbreaking scientific work by Charles Darwin, published in 1859. It introduced the theory of evolution through natural selection, explaining how populations evolve over generations. The book provides compelling evidence for the diversity of life arising from a common ancestor, supported by Darwin's collected data from the Beagle expedition and further research.

Quotations from Chairman Mao Tse-tung: 'Quotations from Chairman Mao Tse-tung' is a collection of writings and speeches by Mao Zedong, the former Chairman of the Chinese Communist Party. It was published from 1964 to 1979 and gained immense popularity during the Cultural Revolution as it was widely distributed.

Silent Spring: 'Silent Spring' is a well-known environmental science book written by Rachel Carson in 1962. It reveals the damaging effects of widespread pesticide use, exposing the chemical industry for spreading disinformation. Carson criticizes public officials for naively accepting the industry's marketing claims without question.

The Structure of Scientific Revolutions: 'The Structure of Scientific Revolutions' is a significant book by philosopher Thomas S. Kuhn that explores the history of science. It challenges the prevailing notion of scientific progress as a gradual accumulation of established facts and theories. Instead, Kuhn proposes a model in which periods of incremental progress, termed "normal science," are punctuated by revolutionary episodes. These revolutions are sparked by the discovery of anomalies that lead to the emergence of new paradigms. These fresh perspectives ask different questions, break from the previous paradigm's puzzle-solving approach, and reshape the direction of research.

Night(memoir): 'Night' is a memoir by Elie Wiesel, recounting his experiences in Nazi concentration camps during the Holocaust. Wiesel discusses the loss of faith and growing disillusionment with humanity that he experienced. The memoir follows his journey from ghettos in Romania to various camps, where Wiesel becomes his father's caregiver. Tragically, his father dies before the liberation of Buchenwald by the US Army in 1945.

Oxford English Dictionary: The Oxford English Dictionary (OED) is a comprehensive historical dictionary published by Oxford University Press (OUP). It provides scholars and researchers with a detailed record of the English language's development and includes usage variations worldwide.

Aesop's Fables: Aesop's Fables are renowned ancient Greek stories, collection of clever tales attributed to a slave named Aesop, who lived from 620 to 564 BCE. These fables, originating from various sources, have been passed down through generations and reimagined in different forms of storytelling up to the present day.

The Bacchae: The Bacchae is an ancient Greek tragedy written by Euripides in Macedonia. It premiered after his death in 405 BC and won first prize in a festival competition. The play is part of a tetralogy and explores themes of religion and spirituality.

The Golden Ass: 'The Golden Ass' is an ancient Roman novel, also known as 'The Metamorphoses of Apuleius'. It is the sole surviving complete Latin novel from that era.

Lysistrata: 'Lysistrata' is an ancient Greek comedy play by Aristophanes, performed in 411 BC. It tells the story of Lysistrata, a woman who aims to end the Peloponnesian War between Greek city states by persuading women to withhold sex from men. Through this tactic, she intends to force the men to negotiate peace, but this strategy stirs up conflict between the genders.

Medea(play): 'Medea' is an ancient Greek tragedy by Euripides, written in 431 BC. The play revolves around the character of Medea, a former princess from Colchis, who is married to Jason. When Jason abandons her for a Greek princess, Medea seeks revenge by killing his new wife and their two children. She then escapes to Athens to start afresh. The play is a part of a trilogy and explores themes of betrayal, vengeance, and the position of women in Greek society.

Oedipus Rex: 'Oedipus Rex', also known as 'Oedipus the King', is an Athenian tragedy written by Sophocles and first performed around 429 BC. The play was originally titled 'Oedipus' and later renamed to 'Oedipus Tyrannus' to distinguish it from another play by the same author. The term "tyrant" in ancient times referred to a ruler without a legitimate claim, but was not always negative.

Oresteia: The Oresteia, written by Aeschylus in the 5th century BCE, is a trilogy of Greek tragedies. It explores the murder of Agamemnon by Clytemnestra, the subsequent murder of Clytemnestra by Orestes, and the trial that follows. The plays also address the curse on the House of Atreus and the resolution of conflict with the Furies.

Panchatantra: The Panchatantra is an ancient Indian collection of animal fables in Sanskrit verse and prose, dating back to around 200 BCE. It is believed to be authored by Vishnu Sharma or Vasubhaga, although their existence is uncertain. The text is rooted in Hinduism and draws from age-old oral traditions, encompassing timeless animal fables.

Kādambari: Kādambari is a romantic novel in Sanskrit, composed by Bāṇabhaṭṭa in the 7th century CE. The novel was completed by Banabhatta's son Bhushanabhatta according to his father's plan. It is divided into two parts, Purvabhaga and Uttarabhaga, written by Banabhatta and Bhushanabhatta respectively.

Kathasaritsagara: The Kathāsaritsāgara is an renowned 11th-century anthology of Indian legends, histories, and folk tales, recast in Sanskrit by Somadeva, a Shaivite.

One Thousand and One Nights: 'One Thousand and One Nights' is a compilation of Middle Eastern folktales written in Arabic during the Islamic Golden Age. Also known as the Arabian Nights, it gained popularity from its first English edition titled 'The Arabian Nights' Entertainment.'

Aladdin: 'Aladdin' is a popular Middle Eastern folktale that gained recognition through Antoine Galland's translation of One Thousand and One Nights. Although not originally part of the collection, Galland added it based on a folktale he heard from a storyteller in Aleppo, Syria.

Romance of the Three Kingdoms: "Romance of the Three Kingdoms" is a 14th-century historical novel written by Luo Guanzhong. Set during the end of the Han dynasty and the Three Kingdoms period, it depicts the period from 184 AD to 280 AD when the land was unified under the Western Jin. The novel draws heavily from the "Records of the Three Kingdoms" by Chen Shou, written in the 3rd century.

The Tale of Genji: The Tale of Genji, or Genji Monogatari, is a renowned Japanese literary masterpiece written by Murasaki Shikibu in the 11th century. The original manuscript, created during the Heian period, is no longer available. It was crafted in the unique "concertina" or orihon style, with multiple sheets of paper pasted and folded alternately.

Water Margin: Water Margin is an ancient Chinese novel, written in vernacular Mandarin by Shi Nai'an. It is also known as Outlaws of the Marsh and All Men Are Brothers.

Candide: 'Candide' is a French satire written by Voltaire, published in 1759. It follows Candide, a sheltered young man who experiences hardships that challenge his optimistic worldview. The novella critiques Leibnizian optimism and concludes with a practical philosophy of tending to one's own affairs instead of relying on a perfect world.

Cinderella: "Cinderella" is a well-known folk tale with countless versions told worldwide. It follows the journey of a young girl living in unfortunate circumstances, whose life dramatically transforms when she marries a king and becomes a queen. The earliest known variant of this story is the tale of Rhodopis, a Greek slave girl who weds the king of Egypt, as recorded by the Greek geographer Strabo between 7 BCE and 23 CE.

Don Quixote: "Don Quixote" is a Spanish novel by Miguel de Cervantes, published in two parts in 1605 and 1615. It is considered a foundational work in Western literature, often hailed as the first modern novel and one of the greatest ever written. This highly translated and widely popular book is recognized for its enduring impact and significant sales.

Dream of the Red Chamber: Dream of the Red Chamber, also known as The Story of the Stone, is a significant 18th-century Chinese novel by Cao Xueqin. It is recognized as one of the Four Great Classical Novels of Chinese literature due to its profound exploration of 18th-century Chinese society, encompassing psychology, worldview, aesthetics, lifestyles, and social relationships.

Goethe'sFaust: 'Goethe's Faust' is a renowned tragedy in two parts by Johann Wolfgang von Goethe, commonly known as Faust, Part One and Faust, Part Two. Part One and a significant portion of Part Two are written in rhymed verse. While the entire play is seldom performed, it is highly popular on German-language stages. Considered by many as Goethe's magnum opus, Faust is widely regarded as the greatest work in German literature.

Gulliver's Travels: "Gulliver's Travels" is a 1726 satire by Jonathan Swift, mocking human nature and travel stories. It follows Lemuel Gulliver, a surgeon turned ship captain, as he explores new lands. Swift's most famous work, it critiques society and was intended to provoke rather than entertain.

Investiture of the Gods: The Investiture of the Gods is a 16th-century Chinese novel written during the Ming dynasty. It is also known as Fengshen Yanyi and Fengshen Bang. This major work in the gods and demons genre combines history, folklore, mythology, legends, and fantasy. With 100 chapters, it was published between 1567 and 1619, or by another source, in a finalized edition in 1605.

Journey to the West: 'Journey to the West' is a renowned Chinese novel from the 16th century, authored by Wu Cheng'en during the Ming dynasty. This classic work is considered one of the greatest in Chinese literature, widely celebrated in East Asia. In English-speaking countries, it is recognized through Arthur Waley's famous abridged translation titled 'Monkey'.'

La Princesse de Clèves: 'La Princesse de Clèves' is a significant French novel published anonymously in 1678. It is recognized as one of the first psychological novels, marking the start of this literary tradition. The book is considered a classic and its author is commonly attributed to Madame de La Fayette.

Robinson Crusoe: "Robinson Crusoe" is an English adventure novel by Daniel Defoe, published in 1719. It showcases the journey of the title character, who is stranded on a remote desert island for 28 years. The book combines various narrative forms and follows Crusoe's encounters with cannibals, captives, and mutineers before his eventual rescue. It is believed to be inspired by the real-life experiences of Alexander Selkirk and Pedro Serrano.

Tartuffe: Tartuffe, a comedic play by Molière, debuted in 1664. It portrays characters like Tartuffe, Elmire, and Orgon, who are regarded as iconic in classical theater.

Utopia(More book): "Utopia" is a fictional book by Thomas More, written in 1516. This socio-political satire revolves around a fictional island society with unique religious, social, and political customs. It offers a depiction reminiscent of monastic life, presented through a frame narrative.

Hamlet: 'Hamlet' is a tragedy written by William Shakespeare in the late 16th century. It is Shakespeare's longest play, set in Denmark, and revolves around Prince Hamlet seeking revenge against his uncle Claudius for killing his father and taking over the throne.

King Lear: King Lear is a tragedy by William Shakespeare, loosely based on the mythological Leir of Britain. The play tells the story of Lear, who divides his power between his daughters Goneril and Regan, based on their false expressions of love. Lear's third daughter, Cordelia, is honest and refuses to flatter him, causing Lear to disown her. Regan and Goneril mistreat Lear, leading him to become destitute and insane. Meanwhile, Edmund, the illegitimate son of Gloucester, betrays his family. Ultimately, Lear, Cordelia, and other characters meet tragic fates.

Macbeth: Macbeth, a tragedy by William Shakespeare, portrays the destructive consequences of political ambition on individuals. It was likely performed in 1606 and is considered to reflect Shakespeare's connection with King James I. Published in 1623, it is one of Shakespeare's shortest tragedies.

A Midsummer Night's Dream: 'A Midsummer Night's Dream' is a comedy play by Shakespeare, set in Athens and centered around the marriage of Theseus and Hippolyta. The play includes subplots involving four lovers and a group of amateur actors. These groups find themselves in a fairy-inhabited forest where manipulation and domestic intrigue take place. This popular play is known for its entertaining and widely performed storylines.

Othello: 'Othello' is a tragic play by Shakespeare, written around 1603. It follows the story of Othello and Iago, exploring themes of jealousy and manipulation.

Romeo and Juliet: 'Romeo and Juliet' is a renowned tragedy by William Shakespeare depicting the love story of two young Italians from rival families. It was one of Shakespeare's most popular and frequently performed plays and is considered a classic tale of young lovers.

The Tempest: The Tempest is a play by William Shakespeare written in 1610–1611. It takes place on a remote island where complex character Prospero and his daughter Miranda live with two servants, Caliban and Ariel. The play explores themes of magic, betrayal, revenge, and family. It includes music and songs that create an enchanting atmosphere. Act IV features a wedding masque that adds spectacle and allegory.

Adventures of Huckleberry Finn: The Adventures of Huckleberry Finn is a novel written by Mark Twain, published in 1884 and 1885. It tells the story of a boy named Huck Finn and his adventures along the Mississippi River. This American classic explores themes of race, morality, and the journey towards freedom.

Alice's Adventures in Wonderland: 'Alice in Wonderland' is a famous children's novel written by Lewis Carroll in 1865. The story revolves around Alice, a girl who enters a magical world after falling into a rabbit hole. The book is known for its nonsensical style and is accompanied by 42 illustrations by John Tenniel.

Anna Karenina: 'Anna Karenina' is a renowned novel by Leo Tolstoy, published in 1878. Tolstoy considered it his first true novel and it is regarded as one of the greatest works of literature. The story was released in parts from 1875 to 1877, with high acclaim. It has gained immense recognition, even being listed by William Faulkner as one of the three greatest novels of all time.

The Brothers Karamazov: "The Brothers Karamazov" is the final novel by Fyodor Dostoevsky, hailed as a masterpiece of world literature. Written over the course of two years, it was published as a serial from January 1879 to November 1880. Unfortunately, Dostoevsky passed away just months after its release.

A Christmas Carol: "A Christmas Carol" is a novella by Charles Dickens, published in 1843. It tells the story of Ebenezer Scrooge, a mean-spirited old man, who undergoes a transformation after being visited by the ghost of his former partner and the spirits of Christmas.

Crime and Punishment: 'Crime and Punishment' is a significant novel by Fyodor Dostoevsky, published in 1866. It marks the second full-length novel of Dostoevsky's mature period, written after his ten-year exile in Siberia. The story was initially serialized in The Russian Messenger before being published as a single volume. It is widely regarded as one of the greatest works in world literature.

A Doll's House: "A Doll's House" is a three-act play by Henrik Ibsen, first performed in 1879 in Copenhagen. Set in a Norwegian town during the same period, the play explores themes of societal expectations and the struggle for personal freedom.

Dracula: Dracula is a 1897 novel by Bram Stoker, told through letters, diary entries, and newspaper articles. It follows solicitor Jonathan Harker's encounter with the vampire Count Dracula in Transylvania. Dracula then moves to England and terrorizes the town of Whitby. A group led by Abraham Van Helsing investigates, hunts, and ultimately kills Dracula.

Eugene Onegin: 'Eugene Onegin' is a novel in verse by Alexander Pushkin, a classic of Russian literature. The story follows the protagonist, who has inspired many Russian literary heroes. The novel was published between 1825 and 1832, and the current version is based on the 1837 publication.

Frankenstein: "Frankenstein" is an 1818 novel by Mary Shelley about Victor Frankenstein, a young scientist who creates a sentient creature through an unconventional experiment. Shelley wrote the story at 18 and it was first published anonymously in London in 1818. The second edition, published in Paris in 1821, revealed Shelley as the author.

Grimms' Fairy Tales: 'Grimms' Fairy Tales', a collection of German fairy tales, was originally known as the Children's and Household Tales. It was published by the Grimm brothers, Jacob and Wilhelm, in 1812. The first edition included 86 stories, followed by 70 more tales in the second edition. Over time, the collection expanded to 200 tales and 10 "Children's Legends" by 1857. These stories are recognized by UNESCO in its Memory of the World Registry.

Heart of Darkness: 'Heart of Darkness' is a 1899 novella by Joseph Conrad. The story is narrated by sailor Charles Marlow, who recounts his experience as a steamship captain for a Belgian company in Africa. The book criticizes European colonialism in Africa and explores themes of power and morality. The narrative mainly takes place on an unnamed river, possibly the Congo River in the Congo Free State, which was then a private territory of King Leopold II of Belgium. Marlow receives a text from Kurtz, an ivory trader who has become immersed in the local culture and is the focus of Marlow's journey.

The Hunchback of Notre-Dame: "The Hunchback of Notre-Dame" is a 1831 French Gothic novel by Victor Hugo, centered around the Notre-Dame Cathedral in 15th-century Paris. The story revolves around Quasimodo, a hunchbacked man, Esmeralda, a Roma street dancer, and Claude Frollo, Quasimodo's guardian and the Archdeacon. This tragic tale contains elements of impossible love, a Renaissance backdrop, and marginalized characters, making it a notable example of Romanticism in literature.

The Importance of Being Earnest: "The Importance of Being Earnest" is a comedic play by Oscar Wilde, first performed in 1895. Set in late Victorian London, the play satirizes social conventions, particularly marriage, through the use of fictitious identities adopted by the main characters. It is celebrated for its humor, farcical elements, witty dialogue, and the way it treats serious institutions with triviality. Despite differing opinions, the play has remained highly popular over time.

Jane Eyre: "Jane Eyre" is a novel by Charlotte Brontë, published in 1847. It is a bildungsroman following the life of Jane Eyre, who grows from a young girl to an adult. The story revolves around her love for Mr. Rochester, the mysterious owner of Thornfield Hall. It explores themes of love, identity, and personal growth.

Les Misérables: "Les Misérables" is a renowned French historical novel (1862) by Victor Hugo, widely regarded as a masterpiece from the 19th century. This acclaimed work has gained popularity through various adaptations for stage, film, and television, including an influential musical.

Little Women: 'Little Women' is a 19th-century novel by Louisa May Alcott that depicts the growth of four March sisters, Meg, Jo, Beth, and Amy, as they transition from childhood to adulthood. Drawing inspiration from the author's own life, this semi-autobiographical story explores themes of coming-of-age and sisterhood.

Madame Bovary: "Madame Bovary" is a novel written by Gustave Flaubert in 1857. It portrays the life of the eponymous character who seeks to escape the dullness of provincial life by living extravagantly and beyond her means.

Middlemarch: "Middlemarch" is a novel by George Eliot, published in 1871-1872. Set in a fictional English town, it explores various intersecting stories and addresses themes like women's status, marriage, idealism, religion, and political reform. It incorporates historical events and societal changes of the time. The book is considered one of Eliot's finest works and a significant contribution to English literature.

Moby-Dick: 'Moby-Dick; or, The Whale' is a novel written by Herman Melville in 1851. It follows the vengeful quest of Captain Ahab, who seeks revenge against Moby Dick, a giant white sperm whale that bit off his leg. Although initially received with mixed reviews and commercial failure, it gained recognition as a Great American Novel in the 20th century. Famous authors like William Faulkner and D. H. Lawrence praised its uniqueness and brilliance. Its opening line, "Call me Ishmael," remains iconic in world literature.

Pride and Prejudice: "Pride and Prejudice" is a notable novel by Jane Austen, published in 1813. It explores the growth of Elizabeth Bennet, the main character, as she experiences the consequences of quick judgments and gains a deeper understanding of true goodness. This novel is primarily concerned with manners and societal expectations during the time it was written.

The Scarlet Letter: "The Scarlet Letter" is a historical fiction novel by Nathaniel Hawthorne published in 1850. It is set in the Puritan Massachusetts Bay Colony during 1642 to 1649 and tells the story of Hester Prynne, who becomes pregnant with a man she is not married to. Hester is publicly shamed and forced to wear a scarlet letter 'A' as punishment. The novel explores themes of legalism, sin, and guilt, and follows Hester's journey to repentance and dignity.

The Three Musketeers: 'The Three Musketeers' is a 1844 French historical adventure novel by Alexandre Dumas, written with ghostwriter Auguste Maquet. It belongs to the swashbuckler genre, portraying heroic and chivalrous swordsmen fighting for justice.

Uncle Tom's Cabin: 'Uncle Tom's Cabin' is an influential anti-slavery novel written by Harriet Beecher Stowe. Published in 1852, it had a significant impact on American perceptions of African Americans and slavery, potentially contributing to the American Civil War.

War and Peace: 'War and Peace' is a renowned literary masterpiece written by Leo Tolstoy. It takes place during the Napoleonic Wars and combines fictional storytelling with chapters dedicated to history and philosophy. Initially serialized in 1865, it was later reworked and published as a complete book in 1869. This work is considered Tolstoy's greatest accomplishment and is widely regarded as a timeless classic in world literature.

Wuthering Heights: Wuthering Heights is Emily Brontë's only novel, published in 1847 under the pen name "Ellis Bell." Set in the West Yorkshire moors, it portrays the intense relationships between two families of the landed gentry – the Earnshaws and the Lintons. The story revolves around their foster son, Heathcliff, and captures the themes of Romanticism and Gothic fiction.

The Call of the Wild: "The Call of the Wild" is a 1903 adventure novel by Jack London, set during the Klondike Gold Rush in Yukon, Canada. The story follows Buck, a dog who is stolen from his home in California and becomes a sled dog in Alaska. In the harsh wilderness, Buck transforms into a wild and primitive creature, fighting for survival and dominance. Through his experiences, Buck sheds his civilized nature and emerges as a leader in the wild, relying on instinct and learned skills.

The Catchers of the Rye: "The Catcher in the Rye" is a novel written by J. D. Salinger that was initially serialized in 1945-46 and later published as a novel in 1951. While originally targeted at adults, it has gained popularity among adolescents due to its exploration of themes such as angst, alienation, and criticism of shallow society. The book delves into ideas of innocence, identity, belonging, loss, connection, sex, and depression. The protagonist, Holden Caulfield, has become an emblem of teenage rebellion as he shares his thoughts on various aspects of his recent life experiences.

The Color Purple: 'The Color Purple' is a Pulitzer Prize-winning novel by Alice Walker that tells the story through letters and won several awards.

The Grapes of Wrath: 'The Grapes of Wrath' is a novel written by John Steinbeck and published in 1939. It won the National Book Award, Pulitzer Prize for fiction, and contributed to Steinbeck being awarded the Nobel Prize in 1962.

The Great Gatsby: "The Great Gatsby" is a 1925 novel by F. Scott Fitzgerald, set in the Jazz Age near New York City. It follows Nick Carraway as he interacts with the enigmatic millionaire Jay Gatsby, who is driven by an intense desire to reconnect with his former lover, Daisy Buchanan.

In Search of Lost Time: "In Search of Lost Time" is a seven-volume novel by Marcel Proust, also known as "Remembrance of Things Past" and "La Recherche" in French. This early 20th-century work is famous for its length and exploration of involuntary memory. Notably, it includes the famous "episode of the madeleine" in the first volume.

Lolita: 'Lolita' is a controversial 1955 novel written by Vladimir Nabokov, a Russian-American novelist. It explores the theme of hebephilia through the story of a French literature professor who moves to New England and takes on the alter ego of Humbert Humbert. Humbert becomes obsessed with Dolores Haze, a 12-year-old girl whom he kidnaps and sexually abuses after becoming her stepfather. He privately refers to her as "Lolita," a Spanish nickname for Dolores. Initially written in English, the novel was first published in Paris due to fear of censorship in the US and Britain.

The Metamorphosis: 'The Metamorphosis' is a renowned novella by Franz Kafka, published in 1915. It follows the tale of Gregor Samsa, a salesman who wakes up one day transformed into a gigantic insect. Throughout the story, Gregor grapples with adapting to his bizarre new form. This work is highly discussed by literary critics, who propose diverse interpretations. In various adaptations, the insect is often portrayed as a cockroach.

Midnight's Children: 'Midnight's Children' is a 1981 novel by Salman Rushdie that explores India's transition from British colonial rule to independence and partition. The story is told through the perspective of the main character, Saleem Sinai, and combines postcolonial, postmodern, and magical realist elements. It intertwines historical events with fictional accounts, offering a self-reflexive approach to preserving history.

On the Road: "On the Road" is a renowned 1957 novel by Jack Kerouac that follows his journeys across the United States with his friends. It stands as a significant literary piece for the Beat and Counterculture generations, portraying characters immersed in jazz, poetry, and drugs. This roman à clef includes notable figures like William S. Burroughs, Allen Ginsberg, and Neal Cassady, with Kerouac representing himself as the narrator, Sal Paradise.

One Hundred Years of Solitude: 'One Hundred Years of Solitude' is a renowned novel by Gabriel García Márquez, published in 1967. It revolves around the Buendía family and their journey across generations in the fictional town of Macondo. This masterpiece is highly regarded as a significant accomplishment in global literature.

Snow Country: 'Snow Country' is a renowned Japanese novel by Yasunari Kawabata. It is acclaimed as a classic piece of Japanese literature, recognized by the Nobel Committee when Kawabata was honored with the Nobel Prize in Literature in 1968.

The Sound and the Fury: "The Sound and the Fury" is a 1929 novel by William Faulkner that features multiple narrative styles, including stream of consciousness. Initially unsuccessful, it gained commercial success and critical attention after Faulkner's sixth novel was published.

The Sun Also Rises: "The Sun Also Rises" is Ernest Hemingway's debut novel, following American and British expatriates on their journey from Paris to the Festival of San Fermín in Pamplona, where they witness bull runs and fights. Despite mixed reviews upon release, it is considered Hemingway's greatest work and an important modernist novel. Published in the US in October 1926 by Scribner's and a year later in London as "Fiesta" by Jonathan Cape, the book continues to be in print.

Things Fall Apart: 'Things Fall Apart' is the debut novel by Chinua Achebe, published in 1958. Set in pre-colonial Igboland, it portrays the arrival of European missionaries and colonial forces in the late 19th century. The book is considered a modern African classic and received widespread critical praise. It is commonly taught in African schools and widely studied worldwide. Originally published by William Heinemann Ltd, it holds the distinction of being the first book in Heinemann's African Writers Series.

To Kill a Mockingbird: 'To Kill a Mockingbird' is a renowned novel by Harper Lee, achieving instant success upon its publication in 1960. The story, inspired by Lee's personal experiences and set in 1936 Alabama, revolves around the lives of relatable characters. Its recognition as a classic of modern American literature was affirmed when it received the prestigious Pulitzer Prize in 1961. Notably, the novel has gained widespread popularity among students in the United States, being commonly taught in high schools and middle schools.

To the Lighthouse: "To the Lighthouse" is Virginia Woolf's 1927 novel that follows the Ramsay family as they make regular visits to the Isle of Skye in Scotland from 1910 to 1920. It explores their dynamics and experiences within this timeframe.

Ulysses(novel): 'Ulysses' is a significant modernist novel by Irish author James Joyce. Originally serialized in The Little Review between 1918 and 1920, it was published as a complete work in 1922. Beach, the publisher, released it in Paris on Joyce's 40th birthday. This novel is acclaimed as a fundamental piece of modernist literature, showcasing the movement at its best. It is known for its groundbreaking portrayal of the thought process in fiction, a technique unprecedented before Joyce's time.

The Chronicles of Narnia: The Chronicles of Narnia is a series of seven fantasy novels by C.S. Lewis. The books follow various children who are transported to the magical world of Narnia. They encounter mythical creatures, protect Narnia from evil, and witness its creation and destruction. The series has been adapted for various media platforms.

Harry Potter: Harry Potter is a popular fantasy novel series by J.K. Rowling. It follows the adventures of young wizard Harry, along with his friends Hermione and Ron, as they attend Hogwarts School of Witchcraft and Wizardry. The central plot revolves around Harry's battles against the evil Lord Voldemort, who seeks immortality and domination over wizards and Muggles.

The Little Prince: "The Little Prince" is a famous novella by Antoine de Saint-Exupéry, a French aristocrat, writer, and military pilot. Published in 1943, the story revolves around a young prince who embarks on a journey across planets, exploring themes of loneliness, friendship, love, and loss. Although it is considered a children's book, "The Little Prince" offers profound observations about life, adults, and human nature.

The Wind in the Willows: 'The Wind in the Willows' is a classic children's novel by Kenneth Grahame, published in 1908. It follows the adventures of Mole, Ratty, and Badger as they assist Mr. Toad, who becomes fixated on motorcars and encounters difficulties. The book also includes separate short stories about the characters. Inspired by Grahame's bedtime tales for his son, the novel has been widely adapted for stage and screen.

The Crucible: The Crucible is a play by Arthur Miller, recounting the events of the Salem witch trials in Massachusetts in the late 17th century. It serves as an allegory for McCarthyism, a government persecution of suspected communists in the United States. Miller himself was questioned by the House of Representatives and convicted of contempt of Congress for refusing to disclose names of others he had met with.

Waiting for Godot: 'Waiting for Godot' is a play by Irish playwright Samuel Beckett about two characters, Vladimir and Estragon, who engage in discussions and encounters as they wait for Godot, who never shows up. The play is a tragicomedy in two acts and is Beckett's translation of his original French-language play, 'En attendant Godot.'

Brave New World: Brave New World is Aldous Huxley's dystopian novel, published in 1932. It portrays a futuristic society where citizens are genetically engineered, controlled through psychological manipulation, and divided into a strict social hierarchy. The story follows a protagonist who challenges this oppressive system. Huxley later revisited the themes in his essay Brave New World Revisited and wrote a utopian novel called Island. The book is often compared to George Orwell's 1984.

Gravity's Rainbow: 'Gravity's Rainbow' is a 1973 novel by Thomas Pynchon set in Europe during World War II. It revolves around the development and launch of V-2 rockets by the German military. The narrative follows various characters on a quest to uncover the secret of the enigmatic Schwarzgerät device, planned for installation in a rocket marked with the serial number "00000".

The Lord of the Rings: "The Lord of the Rings" is a widely popular epic fantasy novel written by J.R.R. Tolkien. It is set in Middle-earth and originally intended as a sequel to "The Hobbit." The book took shape between 1937 and 1949 and has since become one of the best-selling novels of all time, with over 150 million copies sold.

Nineteen Eighty-Four: "Nineteen Eighty-Four" is a dystopian novel by George Orwell that warns about the dangers of totalitarianism and mass surveillance. It portrays a society controlled by a repressive regime, based on the Soviet Union and Nazi Germany. The book explores the manipulation of truth and the consequences of living in a world where facts can be distorted. Published in 1949, it remains a cautionary tale about the power of authoritarianism and the importance of individual freedom.

The War of the Worlds: 'The War of the Worlds' is a science fiction novel by H. G. Wells, published in 1898. It depicts an early conflict between humans and extraterrestrial beings known as Martians, as told through a first-person narrative in southern England. The novel is highly regarded in the genre of science fiction.

The Adventures of Tintin: 'The Adventures of Tintin' is a highly popular series of 24 bande dessinée albums created by Belgian cartoonist Hergé. It became one of the most popular European comics of the 20th century, with over 200 million copies sold in more than 70 languages. Tintin's adventures have been adapted into various forms such as radio, television, theatre, and film.

Asterix: "Asterix" is a popular bande dessinée comic book series depicting the adventures of Gaulish warriors in their fight against the Roman Republic during Julius Caesar's era. The warriors are aided by a magic potion as they travel the world. Created by René Goscinny and Albert Uderzo in 1959, the series has had new writers and illustrators since then, with a recent volume released in October 2023 by Fabrice Caro.

Peanuts: Peanuts is a popular American comic strip created by Charles M. Schulz that ran from 1950-2000. It is considered one of the most influential in comic strip history, with nearly 18,000 published strips. Peanuts reached a massive readership of around 355 million in 75 countries and was translated into 21 languages. It solidified the four-panel gag strip format and earned Schulz over $1 billion through merchandise sales.

Aeneid: The Aeneid is a Latin epic poem written by Virgil between 29 and 19 BC. It follows the legendary tale of Aeneas, a Trojan who escapes the fall of Troy and journeys to Italy. The poem consists of 9,896 lines in dactylic hexameter. The first six books depict Aeneas' travels, while the second half portrays the Trojans' successful battle against the Latins, leading to their integration into Roman society.

Divan-i Shams-i Tabrizi: Divan-i Shams-i Tabrizi, also known as Divan-i Kabir, is a collection of over 40,000 Persian poems by Rumi, a renowned Persian poet and Sufi mystic. It includes 3,000 ghazals and showcases Rumi's distinctive poetic style. Written after the disappearance of Rumi's spiritual teacher, Shams-i Tabrizi, the Divan is dedicated to him and explores themes of love and longing. Despite being a compilation of lyrical poems, it delves into deep philosophical ideas.

Epic of Gilgamesh: The Epic of Gilgamesh is an ancient Mesopotamian epic poem. It originated from Sumerian poems about King Bilgamesh and was later combined into an Akkadian epic. The oldest surviving version, called the "Old Babylonian" version, dates back to the 18th century BC. The later "Standard Babylonian" version was compiled by Sîn-lēqi-unninni between the 13th and 10th centuries BC. Approximately two-thirds of this version have been found, with important copies discovered in the library ruins of the Assyrian king Ashurbanipal from the 7th century BC.

Iliad: The Iliad is an ancient Greek epic poem attributed to Homer. It is one of the oldest surviving works of literature still widely read today. Divided into 24 books and written in dactylic hexameter, it contains 15,693 lines. Set during the Trojan War, the poem portrays the final weeks of the ten-year siege on Troy by a coalition of Greek states. It highlights a fierce argument between King Agamemnon and warrior Achilles. The Iliad is considered a pivotal part of the Epic Cycle and is often viewed as the earliest significant piece of European literature.

Mahabharata: The Mahabharata is an important Hindu Smriti text and Sanskrit epic, alongside the Ramayana. It depicts the Kurukshetra War, a battle for power between two groups of princely cousins, the Kauravas and the Pandavas.

Masnavi: The Masnavi is a renowned Persian poem written by Rumi, considered one of the most influential works of Sufism. It is often compared to the Quran and is highly regarded in Islamic literature. Comprising six books and around 25,000 verses, it serves as a spiritual guide for Sufis to attain profound love for God.

Metamorphoses: Metamorphoses is a Latin narrative poem by Ovid, written in 8 CE. It is considered Ovid's most important work. The poem tells the history of the world, covering over 250 myths, in a framework that combines mythology and history. It consists of 15 books and 11,995 lines.

Odyssey: The Odyssey is a renowned ancient Greek epic poem by Homer. It is one of the oldest surviving literary works and consists of 24 books. The story revolves around Odysseus, the king of Ithaca, as he embarks on a perilous journey back home after the Trojan War. Lasting for 10 years, Odysseus faces countless challenges and loses all his crewmates. Meanwhile, his family deals with presumptions of his death and the pursuit of suitors for his wife Penelope's hand in marriage.

Shahnameh: The Shahnameh is a long epic poem written by Ferdowsi, considered the national epic of Greater Iran. It consists of 50,000 couplets, making it one of the world's longest epic poems written by a single author. The poem narrates the mythical and historical past of the Persian Empire from the beginning of time to the Muslim conquest in the 7th century. This national epic is celebrated not only in Iran but also in countries influenced by Persian culture like Azerbaijan, Afghanistan, Tajikistan, and parts of Armenia, Dagestan, Georgia, Turkey, Turkmenistan, and Uzbekistan.

Beowulf: Beowulf is an Old English epic poem about a hero named Beowulf who comes to the aid of a king whose hall has been attacked by a monster. Beowulf defeats the monster and its mother, becomes king, and later dies while battling a dragon. The poem consists of 3,182 alliterative lines and is considered one of the most important works of Old English literature. It is set in pagan Scandinavia in the 6th century and is believed to have been written between 975 and 1025 AD.

The Canterbury Tales: The Canterbury Tales is a renowned collection of 24 stories written by Geoffrey Chaucer in Middle English between 1387 and 1400. It is considered his most significant work, and tells the tales of pilgrims traveling from London to Canterbury to visit Saint Thomas Becket's shrine. The stories are presented as part of a contest, with a free meal at the Tabard Inn as the prize.

Divine Comedy: The Divine Comedy is an influential Italian narrative poem by Dante Alighieri. It is considered a masterpiece of Western literature, portraying an imaginative vision of the afterlife in the 14th century. The poem helped establish the Tuscan language as standardized Italian and is divided into three parts: Inferno, Purgatorio, and Paradiso.

Nibelungenlied: The Nibelungenlied, also known as The Song of the Nibelungs, is an epic poem written in Middle High German around 1200. It is based on Germanic heroic legends with historical roots in the 5th and 6th centuries. The poem has similarities to Scandinavian epics such as the Poetic Edda and the Völsunga saga. The anonymous poet is believed to be from the Passau region.

Poetic Edda: The Poetic Edda is a collection of Old Norse narrative poems in alliterative verse, separate from the Prose Edda. It is vital for studying Old Norse poetry and exists in various versions. A notable version is the Codex Regius, a medieval Icelandic manuscript with 31 poems.

Rubaiyat of Omar Khayyam: The Rubaiyat of Omar Khayyam is a renowned collection of poems translated by Edward FitzGerald in 1859. It consists of selected quatrains attributed to Omar Khayyam, a Persian astronomer-poet from the 11th and 12th centuries. FitzGerald's translation introduced Khayyam's mesmerizing verses to the English-speaking world, earning him the title of "the Astronomer-Poet of Persia."

Song of Roland: The Song of Roland is an ancient French epic poem from the 11th century based on the leader Roland in the Battle of Roncevaux Pass during the reign of Charlemagne. It is the oldest known significant work in French literature, and its popularity continued for centuries in the Medieval and Renaissance periods, as evident through its numerous manuscript versions.

Oku no Hosomichi: 'Oku no Hosomichi' is a renowned haibun by poet Matsuo Bashō, regarded as an important piece of Japanese literature from the Edo period. It was first published in 1702 after the poet's death.

Paradise Lost: 'Paradise Lost'is a renowned epic poem written by English poet John Milton in the 17th century. It consists of ten books in the initial publication in 1667, later revised in 1674 to contain twelve books. This masterpiece solidified Milton's reputation as one of the greatest English poets ever. The poem revolves around the biblical account of humanity's fall, narrating Adam and Eve's temptation by Satan, a fallen angel, and their subsequent expulsion from the Garden of Eden.

The Rime of the Ancient Mariner: "The Rime of the Ancient Mariner" is a lengthy poem by Samuel Taylor Coleridge, first published in 1798. It is considered a significant work in British Romantic literature and marks a shift towards modern poetry. A revised edition, printed in 1817, includes a gloss.

Shakespeare's sonnets: Shakespeare's sonnets are a collection of 154 poems written by William Shakespeare between 1592 and 1598. They cover various themes and emotions. The majority of the sonnets were published together in 1609, but there are also six additional sonnets embedded within three of his plays. Additionally, a partial sonnet is found in the play Edward III.

Songs of Innocence and of Experience: 'Songs of Innocence and of Experience' is a collection of illustrated poems by William Blake created in 1789. Blake printed and illuminated a few initial copies himself, and later combined them with new poems in a volume titled 'Songs of Innocence and of Experience Shewing the Two Contrary States of the Human Soul'. Prior to this, Blake was a painter whose works included depictions of Oberon, Titania, and Puck dancing with fairies.

Duino Elegies: The 'Duino Elegies' are a collection of ten powerful poems written by Rainer Maria Rilke, a renowned German-language poet. He started writing them in 1912 while staying at Duino Castle, and dedicated them to Princess Marie von Thurn und Taxis upon their publication in 1923. Rilke faced long periods of depression during the ten-year writing process, often influenced by World War I and his military service. However, he completed the collection with renewed passion in February 1922 while residing in Switzerland. The 'Duino Elegies' quickly gained recognition as Rilke's most significant work.

Leaves of Grass: 'Leaves of Grass' is a renowned poetry collection by American poet Walt Whitman. It underwent multiple editions over four decades, with six or nine separate versions depending on categorization. Whitman passionately devoted much of his life to writing, revising, and expanding this collection until his death in 1892. The initial edition consisted of only twelve poems, while the final one encompassed an impressive compilation of over 400 poems.

The Raven: "The Raven" is a famous narrative poem by Edgar Allan Poe, published in January 1845. It is known for its musicality, stylized language, and eerie atmosphere. The poem tells the story of a heartbroken lover visited by a talking raven, symbolizing doom and despair. The raven's relentless repetition of the word "Nevermore" torments the protagonist. Throughout the poem, Poe incorporates various references from folklore, mythology, religion, and classical literature.

The Waste Land: 'The Waste Land' is a renowned 20th-century poem by T. S. Eliot. Considered a crucial piece of modernist poetry, it consists of 434 lines and was first published in 1922. Notable phrases from the poem include "April is the cruellest month," "I will show you fear in a handful of dust," and "These fragments I have shored against my ruins."

Music: Music is the arrangement of sounds to create form, harmony, melody, and rhythm. It is a cultural universal, but varies in definition across cultures. The creation of music involves composition, improvisation, and performance. It encompasses academic disciplines, criticism, philosophy, psychology, and therapy. Music can be performed using various instruments, including the human voice, making it versatile and creative.

Concert: A concert is a live music performance for an audience. It can be a solo recital or involve a musical ensemble like an orchestra or band. Concerts take place in various settings, from small clubs to large stadiums. They are also referred to as shows or gigs.

Choir: A choir is a group of singers who perform choral music. This music can be classical or popular, covering centuries of compositions. The choir is led by a conductor who directs the performances using gestures.

Music video: A music video is a short film produced to promote a song or album through visual representation. It serves as a marketing tool for music recordings and is primarily showcased on TV and streaming platforms like YouTube. It can also be released on home video formats. Various terms, such as "illustrated song" or "promo film," have been used to describe this format.

Music industry: The music industry is the complex network of individuals and organizations involved in creating, producing, performing, and selling music. It includes songwriters and composers, musicians, singers, record labels, music publishers, recording studios, music producers, live event organizers, and various support services. This industry encompasses all aspects of music creation, distribution, and live performances.

Musicology: Musicology is the study of music through scholarly analysis and research. It is primarily associated with the humanities but also intersects with social sciences. Musicologists are scholars who engage in musical research.

Orchestra: An orchestra is a large ensemble of instruments from various families, typically found in classical music. It consists of four main sections: bowed strings (violin, viola, cello, double bass), woodwinds (flute, oboe, clarinet, bassoon), brass (horn, trumpet, trombone, cornet, euphonium, tuba), and percussion (timpani, snare drum, bass drum, cymbals, triangle, tambourine, tam-tam, mallet percussion).

Rapping: Rapping is a form of artistic vocal expression incorporating rhyme, rhythmic speech, and street vernacular. It is performed over musical accompaniment, distinguishing it from spoken-word poetry. Rap's key components are content, flow, and delivery. It differs from singing as it lacks pitch variation and often plays with vocal qualities like timbre. Rap is a vital element of hip hop music and is commonly referred to as "rap music."

Singing: Singing is the act of producing musical sounds with the voice. Singers, also known as singers, artists, or vocalists, perform music with or without musical accompaniment. They can perform solo or as part of a group like a choir. Singing encompasses various styles including opera, Chinese opera, Indian music, Greek music, Japanese music, religious music like gospel, traditional and world music, jazz, blues, and popular music genres like pop, rock, and electronic dance music.

Song: A song is a musical composition sung with distinct melodies and patterns of sound and silence. It may include repetition and variation of sections.

Musical notation: Musical notation is a visual system that represents music through symbols. It includes symbols for durations of silence and is used to play instruments or sing. Reading music is the process of decoding musical notation.

Music theory: Music theory is the study of music practices and possibilities. It has three main uses: understanding music notation, learning scholars' views on music throughout history, and defining processes and principles in music. Unlike music analysis, it focuses on the fundamental materials of music rather than individual works or performances.

Chord (music): A chord in music is a combination of multiple notes played together or almost together. It includes arpeggios and broken chords in the appropriate musical context.

Counterpoint: Counterpoint is the harmonically interconnected yet rhythmically and melodically independent relationship between multiple musical lines, commonly found in European classical music. It flourished during the Renaissance and Baroque periods. The term stems from the Latin phrase "note against note".

Harmony: Harmony in music is the combination of different sounds to create distinct musical ideas. It involves the effects created by different pitches coinciding with each other, categorized into chords, textures, and tonalities. Harmony encompasses both the frequency and time dimensions, overlapping with concepts like melody, timbre, and form.

Melody: A melody, also called a tune, voice, or line, is a sequence of musical tones that the listener perceives as a unified entity. It combines pitch and rhythm and can include tonal color. Melody is the main focus and is accompanied by background music.

Rhythm: Rhythm refers to the regulated succession of strong and weak elements or different conditions. It involves a regular recurrence or pattern in time, which can be seen in various natural phenomena with different periodicities ranging from microseconds to years.

Scale (music): A scale in music theory is a set of notes ordered by pitch. Ascending scales increase in pitch, while descending scales decrease in pitch.

Ballad: A ballad is a musical narrative poem that originated from the medieval French "dance songs." It was a popular form of poetry and song in Britain, Ireland, and across Europe from the Late Middle Ages until the 19th century. Ballads spread to various continents including Australia, North Africa, North America, and South America.

Lullaby: A lullaby is a soothing song played for children, with various purposes including passing down cultural knowledge and aiding sleep. Lullabies help develop communication skills, indicate emotional intent, maintain attention, regulate behavior, and modulate infants' arousal. They are simple and repetitive melodies found worldwide since ancient times.

National anthem: A national anthem is a patriotic musical composition symbolizing a country's history and traditions. Most national anthems are marches or hymns. Different regions have different musical styles, with American, Central Asian, and European nations favoring ornate and operatic pieces, and regions like the Middle East, Oceania, Africa, and the Caribbean using simpler fanfare. Some countries with multiple states have their own official anthems for each state, although they are not sovereign states.

Protest song: A protest song is a song linked to a movement for social change and falls under the category of topical songs. It can be folk, classical, or commercial music.

Christmas carol: A Christmas carol is a festive song sung during the Christmas season, often referred to as noel. It is a subset of Christmas music and carries the theme of Christmas.

Hymn: A hymn is a devotional song written for adoration or prayer, typically addressed to a deity or a prominent figure. The term comes from Greek ὕμνος, meaning "a song of praise." A writer of hymns is called a hymnist and the singing or composition of hymns is known as hymnody. Hymns can be found in collections called hymnals or hymn books, and may or may not include instrumental accompaniment.

Classical music: Classical music is Western art music known for its complexity and formality. It distinguishes from folk and popular music and can also refer to non-Western art music. It has a rich history since the ninth century, with a sophisticated notational system and extensive literature. Composers have greatly influenced its development, making classical music a foundational component of Western culture.

Aria: An aria is a standalone vocal piece in music, often accompanied by instruments, and is usually part of a larger composition.

Chamber music: Chamber music is a form of classical music composed for a small group of instruments suited for a palace chamber or large room. It encompasses art music performed by a small number of musicians, with one musician per part. It excludes solo instrument performances.

Concerto: A concerto is an instrumental composition from the late Baroque era, typically written for soloist(s) and accompanied by an orchestra or ensemble. It features a three-movement structure, with a slow movement between fast movements. The concerto's structure became standard in the early 18th century.

Fugue: A fugue is a contrapuntal technique in classical music, consisting of two or more voices. It is built on a subject that is introduced in imitation and recurs throughout the composition. Fugues typically have three sections: exposition, development, and a final entry with the subject in the tonic key. They may include episodes, stretto, and a recapitulation. Fugues were popular in the Baroque era and demonstrated mastery of harmony and tonality through counterpoint.

Opera: Opera is a theatrical art form where singers take on dramatic roles accompanied by music. It combines various performing arts, including acting, scenery, costume, and occasionally dance. Usually performed in an opera house, with an orchestra or smaller musical ensemble conducted by a conductor. It is distinct from musical theatre.

Sonata: A sonata is a piece played, not sung, in music. Its meaning has evolved throughout history and it represents a variety of forms. In the Classical era, it became an important principle for composing large-scale works. Sonata is a vague term with different meanings across time periods. It is considered one of two fundamental methods, alongside the fugue, for organizing and analyzing concert music. Despite changing musical styles, most modern sonatas maintain the same structure as those from the Classical era.

Symphony: A symphony is a lengthy musical composition typically performed by an orchestra. It consists of multiple distinct sections or movements, often with four, and begins with a sonata-form first movement. Symphonies are scored for a combination of string, brass, woodwind, and percussion instruments, played by 30 to 100 musicians. The musical score contains all the instrument parts, and some symphonies include vocal sections.

Medieval music: Medieval music refers to the sacred and secular music of Western Europe during the Middle Ages (6th-15th centuries). It is the first and longest era of Western classical music, divided into Early, High, and Late medieval periods. Considered part of early music, it preceded the common practice period and was followed by Renaissance music.

Gregorian chant: Gregorian chant is a sacred song in Latin of the Roman Catholic Church. It developed in Europe during the 9th and 10th centuries by combining Old Roman and Gallican chants. Although often attributed to Pope Gregory I, scholars believe it emerged from a Carolingian synthesis. It is a monophonic and unaccompanied form of plainchant.

Renaissance music: Renaissance music refers to European music from the 15th and 16th centuries. It marks a shift from Medieval to Baroque styles, emphasizing triadic harmony and the contenance angloise influence. This period's end is often linked to the introduction of basso continuo in the Baroque era.

Baroque music: Baroque music refers to the dominant style of Western classical music from about 1600 to 1750. It followed the Renaissance period and preceded the Classical period. The Baroque period is divided into three phases: early, middle, and late. Baroque music is a major part of the classical music canon and is well-studied, performed, and appreciated. The term "baroque" comes from the Portuguese word for "misshapen pearl." Notable composers of the Baroque era include Vivaldi, Handel, and Bach, as well as Monteverdi, Scarlatti, Pachelbel, and Purcell, among others.

Classical period (music): The Classical period in music spanned from around 1750 to 1820. It was characterized by balanced compositions, clarity of form, and refined melodies. Notable composers during this period include Mozart, Haydn, and Beethoven.

Romantic music: Romantic music refers to a style of Western classical music that emerged during the 19th century, known as the Romantic era. It is intricately linked to the broader artistic and intellectual movement of Romanticism, which prevailed in Western culture from approximately 1798 to 1837.

20th-century classical music: 20th-century classical music refers to art music composed between 1901 and 2000. This period lacked a dominant style, with various styles like modernism, impressionism, and post-romanticism emerging. Neoclassicism and expressionism also became prominent. Minimalism marked a shift towards postmodernism. Significant developments in this era include aleatory, atonality, serialism, musique concrète, electronic music, and concept music. Additionally, jazz and ethnic folk music greatly influenced composers during this time.

Contemporary classical music: Contemporary classical music refers to Western art music created in recent times. It encompasses various styles such as post-tonal, serial, electronic, experimental, minimalist, spectral, and post-minimalist. It emerged after the death of Anton Webern in 1945 and continues to evolve in the 21st century.

Sub-Saharan African music traditions: Sub-Saharan African music traditions serve a purpose beyond entertainment, playing a significant role in daily routines and community life. They provide music and dance for various occasions, including work, religious ceremonies, and key life events like birth, marriage, and funerals. The drums are not only used for communication but also serve as a means of cultural expression.

Arabic music: Arabic music encompasses diverse styles and genres found throughout the Arab world. Each country and region has its own distinct traditional music, reflecting the rich and varied musical heritage. This music is influenced by the linguistic dialects and cultures of the Arab countries, resulting in a vibrant and unique musical tradition.

Music of China: The music of China encompasses diverse traditions originating from ethnic groups, both within and outside the country. It incorporates traditional classical and folk genres, as well as popular music influenced by Western culture. Chinese music theory, traditional instruments, and languages are integral to its production and expression.

Indian classical music: Indian classical music is the traditional music of the Indian subcontinent, with two major traditions: Hindustani in the North and Carnatic in the South. These traditions were unified until the 15th century when they became distinct. Hindustani music emphasizes improvisation and exploring ragas, while Carnatic music tends to be composition-based. Despite their differences, they also share common features. Additionally, Odissi music is another unique classical tradition from the Eastern part of India, originating thousands of years ago.

Gamelan: Gamelan is traditional Indonesian ensemble music played by Javanese, Sundanese, and Balinese people. It consists mostly of percussive instruments including metallophones and hand-drums called kendang. Other common instruments are the kemanak, gangsa, xylophones, bamboo flutes, a bowed string instrument called a rebab, and a zither-like instrument called a siter. Vocalists, known as sindhen or gerong, are also featured.

Musical instrument: A musical instrument is a device that creates musical sounds. It can be any object that produces sound with the purpose of making music. Those who play musical instruments are known as instrumentalists. Musical instruments have been used since the beginning of human culture, initially for rituals and later for entertainment. They have evolved alongside changing applications and technologies.

Electronic musical instrument: An electronic musical instrument, also known as an electrophone, uses electronic circuitry to produce sound. It generates an electrical or digital audio signal which is then amplified and played through loudspeakers.

Synthesizer: A synthesizer is an electronic instrument that produces sound waves in various ways, such as subtractive and additive synthesis. It can modify sounds using filters, envelopes, and low-frequency oscillators. They are played with keyboards or controlled by sequencers and software, and can be synchronized with other equipment via MIDI.

Keyboard instrument: A keyboard instrument is a musical device operated by pressing levers with fingers. Examples include piano, organ, synthesizers, and digital pianos. Other types are celestas and carillons, offering unique sounds and methods of operation.

Accordion: The accordion is a box-shaped musical instrument with a bellows that is played with both hands. It combines a melody section on the right side and accompaniment functionality on the left side. The musician plays the melody using buttons or keys on the right and uses bass or chord buttons on the left for accompaniment. Someone who plays the accordion is called an accordionist.

Harpsichord: A harpsichord is a keyboard instrument that plucks strings using levers activated by the keys. It has a soundboard mounted in a wooden case to amplify vibrations. Harpsichords can have multiple keyboards and a pedal board. Some also include stop buttons for additional octaves and a buff stop to mute the strings for a lute-like sound.

Piano: The piano is a keyboard instrument with 88 black and white keys. It can play 88 different pitches in a range of over seven octaves. This includes keys for the C major scale and "accidentals" for playing in all twelve keys.

Pipe organ: A pipe organ is a musical instrument that uses pressurized air to produce sound through a selection of organ pipes. It consists of different sets of pipes called ranks, each with a consistent timbre, volume, and construction across the keyboard. With controls called stops, players can use various ranks of pipes with different pitch, timbre, and volume in combination or individually.

Percussion instrument: A percussion instrument is struck or scraped to produce sound. It includes a variety of instruments such as drums, rattles, and beaters. Percussion instruments are considered to be the oldest musical instruments in history. They can be categorized into idiophones, membranophones, aerophones, and cordophones.

Bell: A bell is a percussion instrument shaped like a hollow cup that produces a single strong tone when struck. It can be struck by a clapper, hammer, or small loose sphere inside. Its shape allows for efficient resonance.

Cymbal: A cymbal is a common percussion instrument made of thin round plates of various alloys. It is often used in pairs and can produce indefinite or definite pitches. Cymbals are widely used in a variety of musical ensembles including orchestras, percussion ensembles, jazz and heavy metal bands, and marching groups. Drum kits typically include crash, ride, or crash/ride cymbals, as well as a pair of hi-hat cymbals. A person who plays cymbals is called a cymbalist.

Djembe: The djembe is a goblet drum originating from West Africa. It is played with bare hands and has a skin-covered surface. The name "djembe" signifies the drum's purpose of bringing people together in peace, with "djé" meaning "gather" and "bé" meaning "peace" in the Bambara language.

Drum: A drum is a percussion instrument with a stretched membrane called a drumhead that is struck with hands or mallets to produce sound. It is the world's oldest and most common musical instrument, remaining largely unchanged for thousands of years.

Xylophone: The xylophone is a percussion instrument with wooden bars that are struck by mallets. It resembles a keyboard and each bar is tuned to a musical pitch. Its scale can be pentatonic, heptatonic, diatonic, or chromatic depending on the style and cultural influence.

String instrument: String instruments, also known as chordophones, produce sound by vibrating strings when played or sounded by a performer.

Bass guitar: The bass guitar is a low-pitched member of the guitar family. It looks like an electric or acoustic guitar but has a longer neck and scale length. It usually has four to six strings and is often used in popular music instead of the double bass. The bass guitar is favored for its lighter weight, use of frets, and design for electric amplification.

Cello: The cello, also known as the violoncello, is a string instrument in the violin family. It is played with a bow, sometimes plucked or hit. Its four strings are tuned in perfect fifths: C2, G2, D3, and A3. Cello music is typically written in the bass clef, with occasional use of the tenor and treble clefs for higher-range passages.

Double bass: The double bass, also called upright bass, is the largest and lowest-pitched instrument in the symphony orchestra. It resembles the cello and has four or five strings.

Electric guitar: An electric guitar is a musical instrument that relies on amplification to produce sound. It uses pickups to convert string vibrations into electrical signals, which are then played through speakers. The guitar's sound can be modified through amplifier settings, knobs, and effects like reverb and distortion. Electric guitars are popular in various music genres, including blues, jazz, rock, and heavy metal. Some designs combine features of electric and acoustic guitars, such as semi-acoustic and acoustic-electric models.

Guitar: A guitar is a stringed instrument with usually six or twelve fretted strings. It is played by strumming or plucking the strings with one hand while pressing selected strings against frets with the other hand. The guitar can produce sound acoustically or can be amplified electronically.

Harp: The harp is a triangular-shaped stringed musical instrument made of wood. It has individual strings that are plucked with the fingers and can be played in different positions and settings. Some harps have multiple rows of strings and pedal attachments.

Lute: A lute is a plucked string instrument with a neck, round back, and hollow cavity. It can be fretted or unfretted.

Lyre: A lyre is a stringed musical instrument in the lute family. It is classified as a yoke lute and has strings attached to a yoke that lies in the same plane as the sound table. It consists of two arms and a crossbar.

Mandolin: A mandolin is a plucked string instrument in the lute family, with four pairs of strings. It is commonly tuned in perfect fifths like a violin. Steel strings are most commonly used. It is part of a family of instruments that includes the mandola, octave mandolin, mandocello, and mandobass.

Viola: The viola is a string instrument that is larger than a violin and produces a lower sound. It has been the middle voice of the violin family since the 18th century. The viola is usually tuned to C3, G3, D4, and A4.

Violin: The violin, also known as a fiddle, is the smallest and highest-pitched instrument in the violin family. It has a hollow wooden body, four strings (tuned in perfect fifths), and is played by drawing a bow across the strings. It can also be plucked (pizzicato) or struck with the wooden side of the bow.

Wind instrument: A wind instrument is a musical instrument where air is blown by the player into a resonator causing vibration. The pitch is determined by the length of the tube and manual adjustments. Sound is produced by blowing through a reed, buzzing into a metal mouthpiece, or blowing through a hole at an edge.

Bagpipes: Bagpipes are a type of woodwind instrument that use enclosed reeds and a bag to provide a continuous source of air. They have been played for centuries in various regions including Europe, Africa, Asia, and South Asia. The Great Highland bagpipes are particularly famous.

Brass instrument: A brass instrument is a musical device that produces sound through the vibrating lips of the player, creating resonance in a tube. They are known as labrosones or labrophones, derived from Latin and Greek words meaning 'lip' and 'sound.'

Horn (instrument): A horn is a musical instrument made of a curved metal tube. It has a narrow end for the musician to blow into and a wide end for sound to come out. Unlike some other brass instruments, the horn has a conical shape that gradually widens. In jazz and popular music, "horn" is sometimes used to refer to any wind instrument. A group of brass or woodwind instruments is called a horn section.

Trombone: The trombone is a brass instrument that produces sound when the player's vibrating lips create vibrations in the instrument's air column. It uses a slide mechanism to change the pitch rather than valves. However, the valve trombone and superbone deviate from this design by incorporating valves in addition to the slide.

Trumpet: The trumpet is a brass instrument used in classical and jazz ensembles. It has various types with different pitch ranges, from the highest piccolo trumpet to the lowest bass trumpet.

Tuba: The tuba is a large and deep-sounding brass instrument that uses lip vibration to produce sound. It emerged in the mid-19th century and replaced the ophicleide, becoming an essential part of modern orchestra and concert bands. The word "tuba" comes from Latin and means "trumpet."

Harmonica: The harmonica, also known as a French harp or mouth organ, is a wind instrument used worldwide in various musical genres. It comes in different types, including diatonic, chromatic, tremolo, octave, orchestral, and bass versions. Using the mouth to direct air, the player produces sound by vibrating a reed inside a chamber behind each hole. The most common type is the diatonic Richter-tuned harmonica with ten air passages and twenty reeds, often called the blues harp.

Woodwind instrument: Woodwind instruments are a family of musical instruments that produce sound by splitting air blown into them on a sharp edge, like a reed or a fipple. They include flutes, clarinets, oboes, bassoons, and saxophones. Contrary to their name, woodwinds can be made from various materials, including wood, brass, silver, and cane. The saxophone, for instance, is made of brass but is classified as a woodwind because it needs a reed. Some woodwinds are even crafted from earthen materials like ocarinas.

Bassoon: The bassoon is a woodwind instrument known for its distinctive tone color, wide range, versatility, and virtuosity. It is played in the tenor and bass ranges and is typically made of wood. There are two modern forms: Buffet and Heckel systems. The bassoon is played while sitting using a seat strap and sound is produced by blowing air pressure on the reed. It appears in orchestral, concert band, and chamber music literature, and is occasionally heard in popular music. A player of the bassoon is called a bassoonist.

Clarinet: The clarinet is a cylindrical woodwind instrument with a flared bell and a single reed.

Flute: The flute is a woodwind instrument that produces sound with a vibrating column of air. Unlike reed instruments, it produces sound when air flows across an opening. Flutes are classified as edge-blown aerophones and a person who plays the flute is called a flautist or flutist.

Pan flute: A pan flute is a closed tube instrument with multiple pipes of various lengths. It is commonly made from bamboo or reeds and has been widely used as a folk instrument. Other materials such as wood, plastic, metal, and ivory are also occasionally used.

Recorder (musical instrument): The recorder is a woodwind instrument with a whistle mouthpiece and is part of the internal duct flute family. It has a thumb-hole and seven finger-holes, making it distinct from other flutes. The recorder is widely used in western classical music.

Western concert flute: The Western concert flute is a popular woodwind instrument made of metal or wood. It is played sideways and is the most common type of flute. In British English, a flute player is called a "flautist," while in American English they are called a "flutist."

Oboe: The oboe is a woodwind instrument with a double reed. It is commonly made of wood but can also be made from synthetic materials like plastic or resin.

Saxophone: The saxophone is a single-reed woodwind instrument with a conical brass body. It produces sound when a reed vibrates on a mouthpiece, and pitch is controlled by opening and closing holes to change tube length. Leather pads attached to keys operated by the player close the holes. Saxophones come in different sizes and are typically transposing instruments. Players are called saxophonists.

Brandenburg Concertos: The Brandenburg Concertos are a renowned collection of six instrumental works composed by Johann Sebastian Bach in 1721. They were presented by Bach to Christian Ludwig, Margrave of Brandenburg-Schwedt. These concertos, also known as Six Concerts à plusieurs instruments, showcase various combinations of solo instruments. Considered among the finest orchestral compositions of the Baroque era, they are highly regarded.

The Four Seasons(Vivaldi): The Four Seasons by Antonio Vivaldi is a set of four violin concerti written around 1718-1720. Each concerto represents a different season of the year. Vivaldi composed these pieces while he was the court chapel master in Mantua. They were later published in 1725 in Amsterdam, along with eight more concerti, under the title Il cimento dell'armonia e dell'inventione.

Mass in B minor: The Mass in B minor by Johann Sebastian Bach is an extensive composition of the Mass ordinary. It was completed in 1749, a year before the composer's death, and incorporates earlier work Bach had composed. Notably, the "Et incarnatus est" part of the Credo was specifically created to complete the Mass in the late 1740s.

Messiah(Handel): 'Messiah' is an English oratorio composed by Handel in 1741, with a libretto compiled from the King James Bible and the Coverdale Psalter. It premiered in Dublin in 1742 and gained popularity over time, becoming one of the most well-known and frequently performed choral works in Western music.

The Well-Tempered Clavier: The Well-Tempered Clavier is a collection of 24 preludes and fugues composed by Johann Sebastian Bach for keyboard instruments like the harpsichord and clavichord. It includes all major and minor keys and was written during Bach's time. The term "clavier" refers to different stringed keyboard instruments. The collection is not limited to the organ.

Piano sonatas (Beethoven): Ludwig van Beethoven composed 32 influential piano sonatas from 1795 to 1822. Considered a significant collection of works, they hold great importance in the history of music. These sonatas have been compared to "The New Testament" of piano literature by Hans von Bülow.

Symphony No. 3 (Beethoven): Symphony No. 3 is a significant composition by Ludwig van Beethoven. It is written in E♭ major and consists of four powerful movements.

Symphony No. 5 (Beethoven): Beethoven's Symphony No. 5, also known as the Fate Symphony, is a renowned classical composition. Composed between 1804 and 1808, it is widely considered a cornerstone of western music. The symphony is famous for its four movements and was first performed in Vienna in 1808. E. T. A. Hoffmann described it as one of the most important works of its time.

Symphony No. 9 (Beethoven): Beethoven's Symphony No. 9 in D minor, Op. 125, is a choral symphony and his final complete symphony. Composed between 1822 and 1824, it premiered in Vienna on 7 May 1824. Considered a masterpiece of Western classical music, it is highly acclaimed by critics and musicologists. Known for its significance in the history of music, it is one of the most frequently performed symphonies globally.

Symphony No. 41 (Mozart): Symphony No. 41, also known as the Jupiter Symphony, is the final and longest symphony composed by Wolfgang Amadeus Mozart. Completed on August 10, 1788, in the key of C major (K. 551), it is widely regarded as one of the greatest symphonies in classical music. The nickname "Jupiter Symphony" was likely given by Johann Peter Salomon, an impresario.

Nocturnes (Chopin): The Nocturnes by Chopin are a collection of 21 solo piano pieces composed between 1827 and 1846. Widely regarded as exceptional short works for the piano, they are significant in modern concert performances. Despite not being the originator, Chopin popularized and advanced the genre, building upon the foundation established by John Field, an Irish composer.

Symphony No. 2 (Mahler): Symphony No. 2, also known as the Resurrection Symphony, is a major work by Gustav Mahler. It was written between 1888 and 1894 and premiered in 1895. This symphony became one of Mahler's most popular and successful compositions. It explores themes of afterlife and resurrection, establishing the composer's lifelong perspective on beauty. The symphony showcases Mahler's innovative use of "sound of the distance" and creates a distinct musical world. With a duration of 80 to 90 minutes, it is conventionally considered to be in C minor, although it incorporates tonalities of C minor–E♭ major. In a survey of conductors by BBC Music Magazine, it was ranked as the fifth-greatest symphony of all time.

La bohème: 'La bohème' is an opera composed by Giacomo Puccini in the late 19th century. It tells the story of a group of poverty-stricken artists and a seamstress living in Paris during the 1830s. The opera captures the Bohemian lifestyle through their struggles and relationships.

Carmen: Carmen is a renowned French opera composed by Georges Bizet. It tells the story of a captivating gypsy named Carmen, based on a novella by Prosper Mérimée. Despite its initial shock to audiences, it gained international acclaim within a decade. Bizet, unfortunately, passed away after the 33rd performance. Carmen remains popular and frequently performed, with standout arias like the "Habanera" and the "Toreador Song."

Don Giovanni: Don Giovanni is a two-act opera composed by Mozart with a libretto by Da Ponte. It is based on a Spanish legend and combines comedy, melodrama, and supernatural elements. Premiered in 1787, it is considered one of Mozart's greatest operas. Critics praise its timeless beauty and its collaboration with Da Ponte as one of Mozart's masterpieces.

The Magic Flute: "The Magic Flute" is a popular opera written by Mozart that premiered in 1791. It is a Singspiel, combining singing and spoken dialogue. The opera continues to be performed and was followed by two sequels. The libretto for a fragmentary second part of the opera was written by Goethe.

The Marriage of Figaro: 'The Marriage of Figaro' is an opera composed by Mozart in 1786. It is based on a comedy by Beaumarchais and tells the story of Figaro and Susanna, two servants who outsmart their employer, Count Almaviva, to get married. The opera explores themes of love, fidelity, and class struggle.

Der Ring des Nibelungen: Der Ring des Nibelungen is a cycle of four epic music dramas composed by Richard Wagner. It is based on Germanic heroic legends and is commonly known as the Ring cycle. The works are structured as a "Bühnenfestspiel," with three days of performances preceded by a Vorabend. They incorporate characters from Norse sagas and the Nibelungenlied.

La traviata: La traviata is an opera by Giuseppe Verdi, based on the novel La Dame aux camélias. It was originally titled Violetta and debuted in 1853 at La Fenice opera house in Venice.

Tristan und Isolde: "Tristan und Isolde" is a three-act opera composed by Richard Wagner and based on the 12th-century romance by Gottfried von Strassburg. Premiered in 1865, it is known for its passionate storyline and complex characters. Wagner referred to it as "eine Handlung" rather than an opera.

The Nutcracker: The Nutcracker is a classical ballet composed by Tchaikovsky in 1892. It is based on a Christmas Eve story set around a child's imagination and the adaptation of Hoffmann's short story. The ballet was choreographed by Marius Petipa with assistance from Lev Ivanov. While the complete ballet was not as successful as the Nutcracker Suite, the ballet soon gained popularity.

The Rite of Spring: 'The Rite of Spring' is a groundbreaking ballet and orchestral piece composed by Igor Stravinsky for the 1913 Paris season of the Ballets Russes. It features avant-garde music and choreography by Vaslav Nijinsky, causing a sensation during its first performance. The piece gained fame both as a stage work and a concert piece, becoming one of the most influential musical compositions of the 20th century.

Swan Lake: Swan Lake is a famous ballet by Tchaikovsky, composed in 1875-76. Initially unsuccessful, it has become one of the most beloved and well-known ballets worldwide.

The Phantom of the Opera(1986 musical): "The Phantom of the Opera" is a musical by Andrew Lloyd Webber, Charles Hart, and Richard Stilgoe. It is based on a French novel by Gaston Leroux. The story revolves around Christine Daaé, a talented soprano, who becomes the object of obsession for a masked musical genius living beneath the Paris Opéra House.

West Side Story: 'West Side Story' is a musical created by Jerome Robbins, with music by Leonard Bernstein, lyrics by Stephen Sondheim, and a book by Arthur Laurents. It is a renowned production that combines music, dance, and storytelling to depict a modern Romeo and Juliet set in 1950s New York City.

Respect (song): "Respect" is a popular song by Otis Redding, released in 1965 from his album Otis Blue. It achieved significant success, serving as a crossover hit for Redding.

Kind of Blue: 'Kind of Blue' is the 1959 studio album by jazz musician Miles Davis, released by Columbia Records. It features Davis leading a sextet including John Coltrane and Julian "Cannonball" Adderley on saxophone, Bill Evans and Wynton Kelly on piano, Paul Chambers on bass, and Jimmy Cobb on drums. Recorded in New York City, the album showcases Davis's innovative compositions and improvisational style, becoming one of the most influential and best-selling jazz albums of all time.

Rhapsody in Blue: 'Rhapsody in Blue' is a famous 1924 musical composition by George Gershwin for solo piano and jazz band. It combines classical and jazz elements and was commissioned by Paul Whiteman for an experimental concert. The piece premiered in New York City with Gershwin on piano, and it was orchestrated by Ferde Grofé several times, including versions for pit orchestra and symphony.

Thriller(album): Thriller is Michael Jackson's sixth studio album, released in 1982. Produced by Quincy Jones, it showcases a blend of pop, post-disco, rock, funk, synth-pop, and R&B sounds. Thriller marked a shift in Jackson's musical direction and introduced themes of paranoia and darkness. Notably, it includes "The Girl Is Mine" featuring Paul McCartney, making it the first album to credit a featured artist. Recorded in Los Angeles over seven months, the album had a budget of $750,000.

Heartbreak Hotel: "Heartbreak Hotel" is a song recorded by Elvis Presley and released as his first single under RCA Victor. Inspired by a newspaper article about a lonely man's suicide, the song was presented to Presley by Mae Boren Axton in November 1955. It was recorded on January 10, 1956, featuring a blues progression and heavy reverberation to imitate Presley's earlier Sun recordings.

Like a Rolling Stone: "Like a Rolling Stone" is a song released in July 1965 by Bob Dylan. It features confrontational lyrics that originated from a draft Dylan wrote after returning from an exhausting tour. The song was recorded a few weeks later as part of the sessions for the album Highway 61 Revisited.

Johnny B. Goode: "Johnny B. Goode" is a popular song released in 1958 by Chuck Berry. It reached number two on the Hot R&B Sides chart and remains a significant track in early and later rock music.

Sgt. Pepper's Lonely Hearts Club Band: 'Sgt. Pepper's Lonely Hearts Club Band' is the eighth studio album by the Beatles, released in May 1967. Considered an early concept album, it pushed the boundaries of sound composition, extended form, psychedelic imagery, and album art. It had a significant impact on multiple generations and was associated with various aspects of youth culture like fashion, drugs, mysticism, and optimism. Critics praised its innovative songwriting, production, and graphic design, as well as its ability to bridge the gap between popular music and high art, reflecting the interests of contemporary youth and counterculture.

Performing arts: Performing arts include music, dance, and drama, performed live for an audience. It is distinct from visual arts, which create physical art objects. The disciplines of performing arts encompass theatre, music, and dance, presented in front of a live audience.

Acting: Acting is the activity of portraying a character in a story through enactment, commonly seen in theater, television, film, radio, or similar mediums. It involves an actor adopting a role to communicate the narrative using the mimetic mode.

Audience: An audience is a group of people who engage with various forms of art, literature, music, and academics. Depending on the medium, audience members participate differently, ranging from active participation to limited interaction like applause and critique.

Costume: Costume is the unique attire or appearance of a person or group that represents their class, gender, profession, ethnicity, nationality, activity, or era. It is a visual representation of a culture.

Stage (theatre): The stage in theater is a designated space for performances. It serves as a focal point for the audience and provides a space for actors or performers. It may be a platform or series of platforms, often permanent in dedicated theaters.

Mime artist: A mime artist, also known as a mime, is a performer who uses the art of mime to tell stories through body movements without speaking. It is a theatrical medium and performance art that originated from mummers. Miming is distinct from silent comedy, where the artist is a character without sound in films or skits.

Performance art: Performance art is an art form where artists or participants create and execute actions as their artworks. It can be witnessed live or through documentation and is typically presented to the public in a fine art context. Also called artistic action, it has played a significant role in avant-garde art of the 20th century.

Performance poetry: Performance poetry refers to poetry that is created and performed specifically for an audience. It encompasses various styles and genres and emerged during the 1980s as a term to describe poetry intended for live performance instead of print distribution. It often allows for improvisation during the performance.

Circus: A circus is a group of performers who put on entertainment shows with various acts such as clowns, acrobats, trained animals, musicians, and magicians. It is also a field of performance and training with a history of 250 years. Philip Astley, born in Newcastle-under-Lyme, is credited as the father of the modern circus.

Acrobatics: Acrobatics is the performance of balance, agility, and coordination skills. It is used in various art forms, sports, and martial arts. Acro dance, circus, gymnastics, and freerunning are the most common forms. It is also used in ballet, slacklining, and diving. It is related to aerobatics as well.

Clown: A clown is a person who performs comedy and arts while wearing distinctive makeup and costumes. They can be found in circuses, theaters, and folklore, and have played significant roles in various cultures throughout history. Clowns elicit a range of emotions and have evolved alongside changing cultural norms and artistic expressions.

Dance: Dance is an art form that involves body movements with aesthetic and symbolic value, often considered a sport. It can be categorized by choreography, repertoire, historical period, or place of origin. Dance is usually performed with music, sometimes with the dancer also using a musical instrument.

Choreography: Choreography is the art of designing sequences of movements for physical bodies, often associated with dance. It involves specifying motion or form or both. A choreographer is the creator of these sequences, and the process is known as choreographing.

Hip hop dance: Hip hop dance is a collection of street dance styles originating from hip hop culture. It is performed primarily to hip hop music and has evolved from various styles developed in the 1970s. The dance gained widespread recognition through popular television shows and movies in the 1980s.

Ballet: Ballet is an influential and highly technical form of performance dance that originated during the Italian Renaissance. It later developed into a concert dance form in France and Russia, and has since become widespread globally. Ballet is known for its own vocabulary and foundational techniques, which have influenced many other dance genres and cultures. Various schools around the world have incorporated their own cultures, resulting in the evolution of ballet in distinct ways.

Ballroom dance: Ballroom dance refers to a collection of partner dances that originated in Europe. It is popular worldwide, enjoyed socially and competitively due to its entertaining and performance-oriented nature. Additionally, ballroom dancing is widely showcased on stage, in films, and television.

Tango: Tango is a partner dance that originated in the 1880s along the Río de la Plata. It emerged from a blend of Argentine Milonga, Spanish-Cuban Habanera, and Uruguayan Candombe. Initially popular in the impoverished port areas of Argentina and Uruguay, it was often performed in brothels and bars. The dance eventually spread globally and now has many variations.

Waltz: The waltz is a ballroom and folk dance that involves rolling or revolving movements. It is typically performed in closed position and follows a triple rhythm.

Folk dance: A folk dance is a traditional dance reflecting the life of people in a specific country or region. It excludes ritual dances that have religious significance.

Belly dance: Belly dance is a Middle Eastern dance that originated in Egypt. It involves expressive movements of the hips and torso and is one of the oldest forms of dance. It has evolved into various styles and costumes, with Egyptian forms being the most recognized globally due to Egyptian cinema. Belly dancing is popular worldwide, practiced in many schools.

Bharatanatyam: Bharatanatyam is a traditional Indian dance form from Tamil Nadu, expressing religious and spiritual themes mainly from Shaivism and Hinduism. It is one of the nine recognized Indian classical dance forms.

Bolero: Bolero is a genre of song that originated in eastern Cuba in the late 19th century. It is unrelated to the Spanish dance of the same name, but shares its sophisticated lyrics focused on love. Considered the quintessential Latin American romantic song of the 20th century.

Flamenco: Flamenco is a unique art form originating from southern Spain, with influences from the gitano subculture. It encompasses various traditional and contemporary musical styles typical of the region. The Romani people, specifically the gitanos, have played a significant role in its development and professionalization. Both gitano and non-gitano Spaniards have contributed to the distinct Andalusian style of flamenco.

Modern dance: Modern dance is a diverse form of dance that emerged in Europe and the United States in the late 19th and early 20th centuries. It combines various dance styles, including ballet, folk, ethnic, religious, and social dancing. Modern dance developed as a rejection of classical ballet and as a means to address social issues such as socioeconomic and cultural factors.

Jazz dance: Jazz dance is a performance dance style that emerged in the USA in the mid-20th century. It encompasses vernacular jazz, Broadway, and dramatic jazz. It draws from African American vernacular dance forms like ragtime, Charleston, Lindy hop, and mambo. Important jazz dance figures include The Whitman Sisters, Florence Mills, Ethel Waters, Al Minns, Leon James, Frankie Manning, Norma Miller, Dawn Hampton, and Katherine Dunham. Jack Cole, Bob Fosse, Eugene Louis Faccuito, and Gus Giordano played significant roles in promoting dramatic jazz dance on stage.

Magic (illusion): Magic, an ancient performing art, includes illusion, stage magic, and close-up magic. It captivates audiences with seemingly impossible tricks and effects using natural methods, distinguishing it from paranormal magic that claims supernatural origins.

Professional wrestling: Professional wrestling is a theater form centered on mock combat in a squared ring. Performers are portrayed as competitive wrestlers engaged in interpersonal conflicts, with good-natured "faces" and villainous "heels." The ring is the main stage, while backstage scenes are filmed for television in a reality TV-like format.

Puppetry: Puppetry is a theatrical performance involving human manipulation of inanimate objects resembling humans or animals. Puppeteers use their hands and arms to control the puppet's body, limbs, and sometimes the mouth and eyes. They may speak as the puppet character or perform to a recorded soundtrack. The script for a puppet performance is called a puppet play.

Theatre: Theatre is a collaborative form of performing art that uses live actors to present real or imagined events before a live audience. It incorporates gesture, speech, song, music, and dance to communicate the experience. It is the oldest form of drama but has now been joined by modern recorded forms. The use of art elements like scenery and stagecraft enhances the physicality and immediacy of the experience. The word "theatre" is derived from the Greek word θέατρον meaning "to see."

Peking opera: Peking opera, also known as Beijing opera, is a dominant form of Chinese opera that emerged in Beijing during the mid-Qing dynasty. It combines music, vocal performance, mime, dance, and acrobatics. Recognized by the mid-19th century, it gained immense popularity in the Qing court and is now considered a cultural treasure of China. Major troupes are based in Beijing, Tianjin, and Shanghai, with the art form also preserved in Taiwan (known as Guójù). Peking opera has also spread to other regions, including the United States and Japan.

Theatre of ancient Greece: The Theatre of Ancient Greece, centered in Athens, emerged around 700 BC and became an integral part of the Dionysia festival dedicated to the god Dionysus. Tragedy, comedy, and the satyr play were the main genres that emerged from this period. Athens exported the festival to its colonies, and modern Western theatre heavily draws from Ancient Greek theatre, including its technical terminology, genre classification, themes, characters, and plots.

Kabuki: Kabuki is a classical Japanese theatre combining dramatic performance and traditional dance. It is characterized by highly stylized performances, exquisite costumes, and the use of elaborate kumadori make-up.

Noh: Noh is a classical Japanese dance-drama that began in the 14th century and continues to be performed today. It is the oldest major theater art still in regular practice. Noh is often grouped with kyōgen under the term nōgaku. Historically, a full nōgaku program consisted of multiple Noh plays with comedic kyōgen pieces interspersed. Nowadays, it is common to have two Noh plays and one kyōgen performance in a program. Additionally, the ritual performance Okina may be included at the beginning of a nōgaku presentation.

Comedy: Comedy is a genre of fiction that aims to be funny and amusing, inducing laughter in various forms of entertainment like theatre, film, stand-up comedy, television, radio, books, etc. It originated in ancient Greece, where political satire in theaters influenced public opinion. Greek comedy typically portrayed conflicts between different groups or generations, with Northrop Frye defining them as the "Society of Youth" versus the "Society of the Old." The essential struggle in comedy is often depicted as a powerless youth facing societal conventions and using clever tactics, resulting in dramatic irony that elicits laughter.

Burlesque: Burlesque is a form of entertainment that uses humor and mockery to satirize serious works. It originated from the Italian word "burla," meaning joke or ridicule. Burlesque can be found in literary, dramatic, and musical works, aiming to provoke laughter through the exaggerated and absurd treatment of their subjects.

Commedia dell'arte: Commedia dell'arte was an early professional Italian theater popular in Europe from the 16th to 18th centuries. It involved masked characters, improvised performances, and scripted comedy sketches. Actresses like Isabella Andreini gained recognition through this style. The plays were a mix of scripted and improvised elements, with entrances and exits being scripted. Commedia dell'arte also featured the use of jokes called "lazzi" and pantomime, mainly performed by the character Harlequin.

Improvisational theatre: Improvisational theatre, also known as improv, is a form of theatre characterized by unplanned and unscripted performances. It is often comedic and involves spontaneous creation by the performers. The dialogue, action, story, and characters are collaboratively developed in real-time without a prewritten script.

Joke: A joke is a humorous narrative structure that aims to make people laugh. It often involves a story with dialogue and ends in a punchline. Jokes can use word play, irony, sarcasm, hyperbole, or other devices to create humor. Linguist Robert Hetzron defines a joke as a short piece of oral literature where the funniness peaks in the final sentence, known as the punchline. There should be no continuation after the punchline to maintain the tension. While jokes may be printed, they are mainly intended for oral transmission and don't require verbatim reproduction.

Parody: Parody is a creative work that imitates and mocks its subject, whether it is an original work, a person, an event, or a movement. It can take various forms in literature, music, theater, television, film, animation, and gaming. Parodies can be satirical or ironic, and they often provide a humorous or critical commentary on the subject being imitated.

Stand-up comedy: Stand-up comedy is a live comedic performance where a comedian engages with the audience from the stage. It involves a comedian delivering jokes and often includes interactions with the crowd.

Drama: Drama is a form of fiction performed in theaters, on radio, or television. It encompasses plays, operas, ballets, and mimes. Dating back to Aristotle, it is considered a distinct genre of poetry, differing from epics and lyrics.

Tragedy: Tragedy is a dramatic genre centered around human suffering and the unfortunate events experienced by the main character. It aims to evoke catharsis, a mingling of pain and pleasure, in the audience. While many cultures have explored this concept, tragedy is often associated with a specific tradition in Western civilization. This tradition is diverse yet has a significant impact on cultural identity and historical continuity, uniting ancient Greeks, Elizabethans, and both Hellenes and Christians.

Musical theatre: Musical theatre is a type of performance combining songs, dialogue, acting, and dance to convey a story and emotions. It integrates words, music, movement, and technical aspects. Music holds equal importance to dialogue and other elements. Known as musicals, these stage works have been popular since the early 20th century.

Broadway theatre: Broadway theatre encompasses theatrical performances in 41 large theaters, with 500+ seats, in New York City's Theater District and Lincoln Center along Broadway. It is considered the pinnacle of commercial live theater, along with London's West End.

West End theatre: West End theatre refers to the top-tier professional theatre performed in the renowned theatres situated in and near London's West End. It is considered the pinnacle of commercial theatre in the English-speaking world, along with Broadway in New York City. Watching a West End show is a popular tourist attraction in London, attracting famous actors from both British and international backgrounds.

Stagecraft: Stagecraft is the technical aspect of theatrical, film, and video production that involves constructing scenery, setting up lighting, designing costumes, managing stages, handling audio engineering, and procuring props. It is the practical implementation of a scenic designer's artistic vision, and is distinct from scenography.

Prehistoric art: Prehistoric art refers to all art created by preliterate cultures before the development of writing or significant contact with literate cultures. It encompasses a wide time span, ending when ancient art begins in older literate civilizations. The term's coverage varies across different regions.

Cave painting: Cave paintings are prehistoric parietal art found on cave walls or ceilings. These paintings were created by Homo sapiens, Denisovans, and Neanderthals, representing the Homo genus. They offer insight into the history and unique abstract thoughts of Homo sapiens. Some interpret these paintings as a display of creativity, spirituality, and sentimental thinking in prehistoric humans.

Rock art: Rock art refers to human-made markings on vertical stone surfaces, often found in caves or partly enclosed rock shelters. Also known as cave art or parietal art, it is a global phenomenon found in culturally diverse regions. The four main types of rock art are cave paintings, petroglyphs (carvings or scratchings), sculpted rock reliefs, and geoglyphs (ground formations).

Ancient Greek art: Ancient Greek art is known for its naturalistic yet idealized portrayals of the human body, particularly of mostly nude male figures. Its rapid stylistic development from 750 to 300 BC is most evident in sculpture. Though paintings are challenging to study due to the absence of high-quality originals, significant advancements occurred in this field as well. Greek art also made notable contributions to painted pottery.

Hellenistic art: Hellenistic art refers to the artistic period between the death of Alexander the Great in 323 BCE and the Roman conquest of the Greek world around 30 BCE. It marked a transition from Classical Greek art to Greco-Roman art. Notable works include famous sculptures like Laocoön and His Sons, Venus de Milo, and the Winged Victory of Samothrace.

Roman art: Roman art encompasses architecture, painting, sculpture, and mosaics, along with metal-work, gem engraving, ivory carvings, and glass. Sculpture was highly regarded, while figure painting held importance too. Surviving from the 1st century BC onward, Roman sculpture is abundant, yet little painting remains.

Gothic art: Gothic art emerged in Northern France during the 12th century, influenced by Romanesque art and Gothic architecture. It spread throughout Europe, coexisting with classical styles in Italy. The International Gothic court style developed in the 14th century and evolved until the late 15th century. Late Gothic art persisted into the 16th century in some areas before being overshadowed by the Renaissance. Key mediums included sculpture, panel painting, stained glass, fresco, and illuminated manuscripts. Gothic art is distinguished by its architectural shifts and unique pace of figurative art development.

Romanesque art: Romanesque art, from around 1000 AD to the 12th century, is characterized by retaining Roman architectural style, like round-headed arches and barrel vaults, while having unique characteristics. It spread throughout Catholic Europe, influenced by Byzantine and Insular art, resulting in a highly innovative and coherent style.

Renaissance art: Renaissance art, emerging in Italy around AD 1400, revolutionized European artistic traditions. It blended the noble art of Classical antiquity with Northern European advancements and applied contemporary scientific knowledge. Alongside Renaissance humanist philosophy, it spread throughout Europe, bringing new techniques and artistic sensibilities to artists and patrons. This period marked Europe's transition from the medieval era to the Early Modern age.

Realism (arts): Realism in the arts aims to represent subject matter truthfully, avoiding artificial and supernatural elements. It is often used interchangeably with naturalism, although they are not the same. Naturalism strives to depict objects with minimal distortion and is linked to the development of perspective and illusionism in Renaissance Europe. Realism, originating in France after the French Revolution, is a specific art movement rejecting idealization and focusing on the everyday and politically conscious themes. Realist painters rejected the dominance of Romanticism and its roots in the late 18th century.

Classicism: Classicism is an aesthetic attitude that seeks to emulate and uphold the standards of ancient Greece and Rome. It emphasizes simplicity, proportion, clarity of structure, and perfection. Classicism values formality and restraint in art, while appealing to the intellect. It encompasses a canon of ideal forms that have long been accepted in the Western tradition.

Mannerism: Mannerism was a European art style that emerged in Italy in the 1520s, lasting until the end of the 16th century. It spread beyond Italy by 1530 and influenced the development of art in Northern Europe until the early 17th century. This style developed during the later years of the Italian High Renaissance and showcased exaggerated poses, complex compositions, and stylized forms. It was later replaced by the Baroque style.

Academic art: Academic art, also known as academicism or academism, refers to the style of painting and sculpture influenced by European art academies in the 19th century. It combined Neoclassicism and Romanticism, with Jean-Auguste-Dominique Ingres as a key pioneer. Other notable artists who followed this style include William-Adolphe Bouguereau, Thomas Couture, and Hans Makart. Academic art often incorporates elements of eclecticism, historicism, and syncretism. It is closely related to Beaux-Arts architecture, sharing a similar classical ideal.

Baroque: Baroque refers to a Western style of art that thrived from the early 17th century to the 1750s. It encompassed architecture, music, dance, painting, sculpture, poetry, and other arts. It emerged after Renaissance art and Mannerism, and preceded the Rococo and Neoclassical styles. The Catholic Church promoted Baroque as a response to the simplicity of Protestant art, while Lutheran Baroque art also emerged in some European regions.

Dutch Golden Age painting: Dutch Golden Age painting refers to the art created in the Netherlands during the 17th century. It flourished after the Eighty Years' War, which led to Dutch independence. This period is known for its remarkable artistic achievements and includes the works of renowned painters like Rembrandt and Vermeer.

Empire style: The Empire style, an early-19th century design movement, was a phase of Neoclassicism. It encompassed architecture, furniture, and decorative arts. Flourishing from 1800 to 1815 during the Consulate and the First French Empire periods, it then extended until the late-1820s. Originating in France, it quickly spread across Europe and the United States.

Rococo: Rococo, also known as Late Baroque, is an ornate and dramatic style of architecture, art, and decoration. It features asymmetry, scrolling curves, gilding, pastel colors, sculpted molding, and trompe-l'œil frescoes. Its key characteristics include surprise, illusion of motion, and a combination of white and pastel colors. Rococo is regarded as the culmination of the Baroque movement.

Modern art: Modern art refers to artistic work produced from the 1860s to the 1970s, characterized by experimentation and breaking away from traditional styles. It involves new ways of seeing, fresh ideas about materials and the purpose of art. Modern artists often moved away from storytelling and towards abstraction. Contemporary and postmodern art are more recent terms to describe artistic production.

Abstract art: Abstract art is a form of visual expression using shapes, colors, lines, and forms to create compositions that may not rely on real-world references.

Cubism: Cubism, an early-20th-century art movement, revolutionized European painting and sculpture. It inspired related movements in music, literature, and architecture. In Cubist works, subjects are analyzed, broken up, and reassembled in an abstract form, using multiple perspectives to depict a greater context. Considered the most influential art movement of the 20th century, Cubism encompassed a variety of artworks produced in Paris or near Paris during the 1910s and 1920s.

Futurism: Futurism was an artistic and social movement from Italy in the early 20th century. It emphasized speed, technology, youth, violence, and modern objects like cars and airplanes. Key figures included Marinetti, Boccioni, and Balla. It aimed to free Italy from its past and celebrated modernity. Prominent works include Marinetti's manifesto, Boccioni's sculpture, Balla's painting, and Russolo's exploration of noise in art.

Abstract expressionism: Abstract expressionism emerged in the US after World War II, replacing social realism influenced by the Great Depression. It gained mainstream acceptance in the 1950s and was first named by art critic Robert Coates in 1946. Key figures of the movement, centered in New York, included Jackson Pollock, Franz Kline, Mark Rothko, and Willem de Kooning.

Art Deco: Art Deco, or Arts Décoratifs, is a visual arts and design style that emerged in Paris in the 1910s and thrived in the 1920s-1930s. It influenced various aspects of life, including architecture, product design, and fashion. The style's distinctive traits can be seen in the exterior and interior of structures, as well as everyday objects such as furniture, radios, and vacuum cleaners. Art Deco's impact spread across Europe and the United States, shaping bridges, buildings, ships, cars, and other transportation modes.

Art Nouveau: Art Nouveau is a global art movement that spanned from 1890 to 1910. It encompassed various art forms, including architecture and decorative arts. Inspired by nature, it incorporated organic shapes like curves of plants and flowers. Key features included dynamic designs, asymmetry, and the use of modern materials such as iron, glass, ceramics, and concrete. Art Nouveau emerged as a reaction against academicism, eclecticism, and historicism prevalent in the 19th century.

Arts and Crafts movement: The Arts and Crafts movement was a worldwide trend in decorative and fine arts, originating in the British Isles and expanding to Europe, America, and the British Empire.

Avant-garde: Avant-garde refers to groundbreaking art and literature that is innovative and often controversial. It challenges established artistic norms and is often initially rejected by traditional art circles. These avant-garde artists and writers push the boundaries of style, form, and subject matter, paving the way for new genres like anti-novels and Surrealism.

Dada: Dada was an early 20th-century European avant-garde art movement, with origins in Zürich and Berlin in 1917. It later thrived in New York City and Paris. Dadaists aimed to challenge conventional art by embracing absurdity, randomness, and anti-establishment ideas. This movement, founded by Hugo Ball and his companion Emmy Hennings, lasted until the mid-1920s.

Expressionism: Expressionism is a modernist movement in art and literature, originating in Northern Europe in the early 20th century. It distorts reality to evoke emotions and ideas, presenting the world from a subjective perspective. Artists prioritize expressing emotional experiences rather than depicting physical reality.

Impressionism: Impressionism was a 19th-century art movement known for its small, visible brush strokes, open composition, and emphasis on depicting light accurately. It featured ordinary subject matter, unique visual angles, and incorporated movement as a crucial element. Originating in Paris, the movement gained prominence in the 1870s and 1880s through independent exhibitions.

Modernism: Modernism is a movement that emerged in the late 19th and early 20th centuries, driven by transformations in Western society. It aimed to create new art, philosophy, and social structures that reflected the modern industrial world, incorporating urbanization, architecture, technology, and war. Artists sought to break free from traditional and outdated forms of art. The motto "Make it New" by poet Ezra Pound encapsulated their approach.

Neoclassicism: Neoclassicism was a cultural movement in Western art, literature, music, and architecture that took inspiration from classical antiquity. It originated in Rome during the rediscovery of ancient ruins and was popularized across Europe by art students returning from Italy. Influenced by the Age of Enlightenment, Neoclassicism competed with Romanticism and lasted until the early 19th century. The architectural style of Neoclassicism persisted throughout the 19th, 20th, and 21st centuries.

Post-Impressionism: Post-Impressionism was a French art movement that emerged between 1886 and 1905. It reacted against Impressionists' focus on naturalistic light and color, instead emphasizing abstract qualities and symbolic content. It encompassed various styles like Les Nabis, Neo-Impressionism, Symbolism, Cloisonnism, the Pont-Aven School, and Synthetism. Key artists include Cézanne, Gauguin, van Gogh, and Seurat.

Postmodernism: Postmodernism is an intellectual stance that rejects reason and questions established beliefs. It challenges the certainty of knowledge and acknowledges the influence of ideology in politics. Postmodernism dismisses objective claims and emphasizes the conditional nature of knowledge. It embraces self-reference, moral and epistemological relativism, pluralism, irony, irreverence, and eclecticism. Postmodernism opposes binary oppositions, stable identity, hierarchy, and categorization.

Pre-Raphaelite Brotherhood: The Pre-Raphaelite Brotherhood was a group of English painters, poets, and art critics founded in 1848. Led by William Holman Hunt, John Everett Millais, and Dante Gabriel Rossetti, the Brotherhood aimed to revive the detailed and vibrant art of the early Renaissance, rejecting the conventional style of the time. They were inspired by the Nazarene movement and shared their principles with other artists like Ford Madox Brown and Arthur Hughes. Later artists, such as Edward Burne-Jones, William Morris, and John William Waterhouse, also followed the Brotherhood's principles.

Romanticism: Romanticism, an artistic and intellectual movement in Europe during the late 18th to mid-19th centuries, emphasized emotion, individualism, and admiration for the past and nature, favoring medieval over classical influences. Reacting against the Industrial Revolution and Enlightenment ideals, it strongly influenced visual arts, music, and literature, and also had significant impact on historiography, education, social sciences, and the natural sciences. Romantic thinking influenced various political ideologies, including conservatism, liberalism, radicalism, and nationalism.

Surrealism: Surrealism is a cultural movement that emerged in Europe after World War I. Artists created unsettling and nonsensical scenes, using techniques to express the unconscious mind. André Breton, the movement's leader, aimed to reconcile dreams and reality into a new, heightened reality called surreality. Surrealism produced various works in painting, writing, theatre, filmmaking, photography, and other media.

Symbolism (arts): Symbolism was a 19th-century art movement that originated in France and Belgium. It aimed to represent absolute truths through symbolic language and metaphorical images. It emerged as a response to naturalism and realism.

Contemporary art: Contemporary art, produced since the mid-20th century, encompasses diverse materials, methods, and subjects. It challenges boundaries and lacks a uniform principle or ideology. Spanning personal and cultural contexts, it engages with identity, community, and nationality.

Conceptual art: Conceptual art, also known as conceptualism, prioritizes the concept or idea over traditional artistic concerns. It emphasizes planning and decision-making beforehand, often resulting in works that can be created by anyone following written instructions. The idea or concept is considered the most important aspect, and the execution is seen as secondary. This approach to art was notably defined by American artist Sol LeWitt, who described it as turning the idea into a machine that produces art.

Land art: Land art, also called Earth art, is an art movement that emerged in the 1960s and 1970s. It originated in the UK and US but has examples from many countries. This trend pushed artistic boundaries through unique materials and remote locations. Artists used local natural elements like soil, rocks, vegetation, and water for their creations. These works were often located far from cities but were documented through photographs in urban art galleries.

Minimalism: Minimalism is an art movement that emerged after World War II, particularly in American visual arts during the 1960s and early 1970s. Prominent artists like Donald Judd, Agnes Martin, and Frank Stella were associated with this movement. Minimalism can be seen as a response to abstract expressionism and modernism. It laid the foundation for contemporary postminimal art practices by emphasizing simplicity and essentialism.

Outsider art: Outsider art is created by self-taught artists who have little or no connection to the art establishment. Their work is often discovered posthumously and often portrays unique mental states, unconventional concepts, or intricate imaginary realms.

Pop art: Pop art is an art movement that emerged in the UK and US in the mid- to late-1950s. It challenges traditional fine art by incorporating imagery from popular culture, like advertising, comic books, and everyday objects. Its aim is to emphasize the ordinary or kitschy elements of any culture, often through irony. Pop artists use mechanical reproduction techniques and may isolate or combine unrelated materials to create meaning.

African art: African art encompasses a diverse range of paintings, sculptures, installations, and other visual culture from native Africans and the African continent. It also includes art from African diasporas, such as African-American and Caribbean, as well as African-inspired art in South American societies. Despite its diversity, African art showcases shared artistic themes across the continent.

Chinese art: Chinese art refers to visual art originating in China, Greater China, or created by Chinese artists, including those outside of China drawing on Chinese culture. Dating back to 10,000 BC, early Chinese art consisted of pottery and sculptures. It often aligns with the succession of ruling dynasties, lasting for centuries. Notable collections of Chinese art can be found at the Palace Museum in Beijing and the National Palace Museum in Taipei.

Indian art: Indian art encompasses a diverse range of art forms like painting, sculpture, pottery, and textiles. It encompasses the Indian subcontinent, including present-day India, Pakistan, Bangladesh, Sri Lanka, Nepal, and sometimes eastern Afghanistan. Indian art showcases a strong emphasis on design, both in traditional and contemporary works.

Islamic art: Islamic art refers to visual arts created by people living in Muslim societies since the 7th century CE. It encompasses various traditions, periods, and genres. Public Islamic art is typically non-representational, featuring plant forms and calligraphy in geometric patterns. It is found in diverse media, from small objects to large decorative schemes in buildings like mosques. Islamic art also includes miniature painting, glass and pottery artifacts, and textile arts such as carpets and embroidery.

Japanese art: Japanese art spans a diverse range of styles and mediums, including pottery, sculpture, ink painting, calligraphy, ukiyo-e paintings, ceramics, origami, bonsai, manga, and anime. Its rich history dates back to ancient times, and continues to thrive today.

Ukiyo-e: Ukiyo-e is a popular genre of Japanese art from the 17th-19th centuries, known for its woodblock prints and paintings. It depicts various subjects like beautiful women, actors, wrestlers, historical tales, landscapes, animals, and even erotica. The term ukiyo-e translates as 'picture[s] of the floating world.'

Persian art: Persian art refers to the rich artistic heritage of Iran, encompassing various forms such as architecture, painting, weaving, pottery, calligraphy, metalworking, and sculpture. Influenced by neighboring civilizations, Persian art has also contributed to and been inspired by Islamic art. This article specifically covers Persian art until 1925, with emphasis on the art of the Qajar dynasty. For later art periods, Iranian modern and contemporary art is explored, while traditional crafts are discussed under arts of Iran. Iran's rock art represents its oldest surviving art form, while Iranian architecture is analyzed separately.

Visual arts of the Indigenous peoples of the Americas: The Indigenous art of the Americas refers to visual artistic practices from ancient times to the present by native peoples in North, Central, and South America, including Greenland. This art also encompasses the Siberian Yupiit, who share significant cultural ties with Native Alaskan Yupiit.

Visual arts: Visual arts encompass various forms of artistic expression, including painting, sculpture, photography, filmmaking, and architecture. It also includes applied arts like industrial design and graphic design. Other disciplines, such as performing arts and textile arts, may feature visual elements.

Wood carving: Wood carving is a type of woodworking that involves using a knife or chisel to shape wood into figures or ornamentation. It can be done with one hand or two, using a chisel and mallet. The term can also refer to the final product, including sculptures and hand-carved details on wooden objects.

Decorative arts: Decorative arts encompass the design and creation of aesthetically pleasing and practical objects. This field includes arts and crafts involved in interior design and objects found within buildings. It excludes architecture but includes ceramics, metalwork, furniture, jewelry, fashion, textiles, and glassware.

Drawing: Drawing is a visual art where marks are made on a two-dimensional surface using instruments like pencils, pens, brushes, or computer styluses.

Folk art: Folk art encompasses various visual art forms created within folk culture. It differs from fine art as it serves practical purposes rather than being purely decorative. Folk artists are usually trained in popular traditions, which sets them apart from the fine art tradition. While there may be some overlap with naive art, the term "folk art" does not apply to traditional societies that produce ethnographic art.

Handicraft: Handicraft refers to a wide range of handmade objects created using simple tools. It encompasses various creative activities involving textiles, materials, clay, etc. The oldest known handicraft is Dhokra, a type of metal casting from India. In Iranian Baluchistan, women make red ware pottery following a tradition dating back 5,000 years. Handicrafts are both practical and aesthetic, representing traditional techniques. These crafts are created locally to fulfill people's needs without the use of machines.

Illustration: Illustration refers to a visual depiction or clarification of a text or idea, often created by an illustrator. It is used in print and digital media like posters, magazines, animations, and video games. Digital illustrations can enhance user experience on websites and apps. Additionally, illustration can serve as a means of providing examples in writing or through pictures.

Mosaic: A mosaic is a decorative pattern or image consisting of small colored stones, glass or ceramic pieces held together by plaster or mortar. It is commonly used to adorn walls and floors, and was highly favored in Ancient Rome.

Mural: A mural is a graphic artwork painted on walls or other surfaces. It can be created using fresco, mosaic, graffiti, or marouflage techniques.

Optical illusion: An optical illusion is a visual perception that appears different from reality. It can be classified into physical, physiological, and cognitive illusions, each with various kinds such as ambiguities, distortions, paradoxes, and fictions. Examples include the bending of a stick in water (physical distortion), motion aftereffect (physiological paradox), afterimage (physiological fiction), and Ponzo, Poggendorff, and Müller-Lyer illusions (cognitive distortions). Physical illusions result from the environment, physiological illusions arise in the eye or visual pathway, and cognitive illusions stem from unconscious inferences.

Perspective (graphical): Perspective (graphical) is a method used in the graphic arts to represent a three-dimensional scene on a flat surface. It creates an approximate image as seen by the eye. This technique, also known as perspective drawing, is commonly used on paper to create a sense of depth and realism in two-dimensional mediums.

Portrait: A portrait is an artistic representation of a person, typically showing their face and expressions. It aims to depict their likeness, personality, and mood. Unlike snapshots, portraits are composed images of a person in a still position. The subject often looks directly at the painter or photographer to engage the viewer effectively.

Printmaking: Printmaking is the art of creating images on various surfaces by printing, typically on paper but also on fabric, wood, metal, and more. It involves manual techniques rather than digital reproduction. However, there is some overlap between traditional and digital methods, such as the use of risograph.

Engraving: Engraving is the process of cutting grooves onto a hard surface to create a design. This can be done on materials like silver, gold, steel, or glass, resulting in a decorated object or an intaglio printing plate. Engraving is a significant and ancient printmaking technique.

Religious art: Religious art encompasses visual representations of religious beliefs and their connection to humans. It is closely associated with sacred art, which serves for worship and religious rituals. While art inspired by religion but not regarded as sacred falls under the term of religious art, it is distinct from sacred art.

Fashion: Fashion encompasses the creation of clothing, accessories, cosmetics, and jewelry that represent diverse cultural aesthetics. It involves combining these elements to create unique outfits, reflecting social status, self-expression, and group affiliation. Fashion is a dynamic industry that encompasses styles, aesthetics, and trends.

Taxidermy: Taxidermy is the practice of preserving animals by mounting or stuffing them for display or study. It involves creating lifelike representations of animals, and the term is used to describe both the process of preservation and the resulting mounts or displays.

Textile arts: Textile arts involve using fibers, whether from plants, animals, or synthetics, to create both functional and ornamental objects.

Ceramic art: Ceramic art is artwork made from clay and other ceramic materials. It encompasses various forms including pottery, tableware, tiles, figurines, and sculptures. Ceramic art is a visual art form and can be considered both fine art and decorative art. It can be created by individuals or groups, in pottery studios or ceramic factories.

Comics: Comics is a visual medium that combines images with text or other information. It uses panels to convey ideas and can include speech balloons, captions, and onomatopoeia for dialogue and sound effects. There is no agreed definition, with some emphasizing the combination of images and text, while others focus on sequentiality or historical aspects. It often involves cartooning and illustration, but can also incorporate photographic images. Common forms of comics include comic strips, cartoons, and comic books. In recent years, bound volumes like graphic novels and webcomics have gained popularity.

Manga: Manga, originating from Japan, are comics or graphic novels with a distinct style dating back to the late 19th century. In Japan, the term encompasses both comics and cartooning, while outside of Japan, it refers to comics initially published in the country.

Painting: Painting is a visual art that involves applying paint or other mediums to a solid surface. It commonly uses a brush but can include other tools like knives, sponges, or airbrushes.

Landscape painting: Landscape painting, or landscape art, is the depiction of natural scenery, showcasing wide views with various elements like mountains, valleys, trees, rivers, and forests. It often includes the sky and incorporates weather. While landscape backgrounds can enhance figure paintings, detailed landscapes emerge in artistic traditions with a foundation in representing diverse subjects.

Oil painting: Oil painting is a technique using pigments mixed with drying oil as a binder. It has been widely used for centuries and allows for greater flexibility, rich colors, layering, and a wide range of tones. However, it is a slower process with the need to let each layer dry before applying another.

Watercolor painting: Watercolor painting is a technique using water-based pigments for creating artwork. It is known as both the medium and the resulting artwork. Aquarelles painted with water-soluble colored ink are referred to as aquarellum atramento, although this term is no longer widely used.

Calligraphy: Calligraphy is a visual art centered on writing, involving the skilled creation and ornamentation of letters using writing instruments like pens and brushes. The modern practice of calligraphy is defined as the artistic expression of signs through a harmonious and skillful approach.

Collage: Collage is an art technique involving the combining of various forms to create a new whole, used predominantly in visual arts but also in music.

Origami: Origami is the Japanese art of paper folding that aims to transform a flat sheet into a sculpture without cuts, glue, or markings. It is now used as a general term for folding practices worldwide. Designs involving cuts are referred to as kirigami.

Sculpture: Sculpture is a three-dimensional art form that includes works presented in height, width, and depth. It is a branch of visual arts, specifically belonging to the plastic arts. Historically, sculptures were created through processes like carving and modeling using materials like stone, metal, ceramics, wood, etc. However, in the modern era, artists enjoy freedom in materials and techniques. Sculptures can be made by removing materials through carving, welding or assembling them, molding, or casting. Various materials can be used for sculpting.

Graffiti: Graffiti is unauthorized public art involving writing, painting, or drawing on surfaces like walls. It encompasses both simple words and intricate wall paintings, and has been practiced since ancient times in various civilizations such as Egypt, Greece, and the Roman Empire.

Along the River During the Qingming Festival: 'Along the River During the Qingming Festival' is a famous handscroll painting by Zhang Zeduan. It depicts the daily life and landscape of Bianjing during the Northern Song dynasty. The painting showcases the festive atmosphere and bustling scenes of the Qingming Festival. It offers a detailed portrayal of society, economy, clothing, and architecture of that time. Considered the most renowned Chinese painting, it has been compared to the Mona Lisa.

Arnolfini Portrait: The Arnolfini Portrait, painted by Jan van Eyck in 1434, is a famous oil painting on oak panel. It is believed to be a double portrait depicting an Italian merchant, Giovanni di Nicolao Arnolfini, and his wife. The couple is shown in what is thought to be their home in Bruges, a city in Flanders.

The Birth of Venus: 'The Birth of Venus' is a renowned painting by Sandro Botticelli, created in the mid-1480s. Depicting the goddess Venus emerging fully-grown from the sea, it is housed in the Uffizi Gallery in Florence, Italy.

The Garden of Earthly Delights: The Garden of Earthly Delights is a triptych oil painting by Hieronymus Bosch, dating from 1490 to 1510. The painting is currently housed in the Museo del Prado in Madrid, Spain. Bosch was between 40 and 60 years old when he painted this masterpiece.

The Last Supper(Leonardo): The Last Supper is a famous mural painting by Leonardo da Vinci, created between 1495 and 1498. It depicts Jesus sharing a meal with his disciples just after he reveals that one of them will betray him. Leonardo's use of space, perspective, motion, and emotional expression make it a renowned work of the High Renaissance. The painting is widely recognized and considered a significant artwork that marked the start of the High Renaissance period.

Las Meninas: 'Las Meninas' is a renowned painting by Diego Velázquez from 1656, displayed in Madrid's Museo del Prado. As a leading artist of the Spanish Baroque, Velázquez beautifully crafted this composition, capturing the viewer's attention for its enigmatic and complex arrangement. Through its portrayal, 'Las Meninas' raises intriguing questions about reality versus illusion and establishes an uncertain relationship between the figures depicted and the observer.

Mona Lisa: The Mona Lisa is a famous portrait painted by Leonardo da Vinci during the Italian Renaissance. It is widely regarded as a masterpiece and is known for its enigmatic expression, composition, subtle modeling, and atmospheric illusion.

The Night Watch: 'The Night Watch' is a famous Dutch Golden Age painting by Rembrandt van Rijn. It portrays a militia company led by Captain Frans Banninck Cocq and is prominently displayed in the Rijksmuseum. The painting is known for its dramatic use of light and shadow and is not actually set at night, despite its title.

Sistine Chapel: The Sistine Chapel is a chapel in Vatican City, originally named the Cappella Magna. It was built by Pope Sixtus IV between 1473 and 1481, and serves as the location for papal activities and the papal conclave. The chapel is famous for its frescoes by Michelangelo, including the Sistine Chapel ceiling and The Last Judgment.

Les Demoiselles d'Avignon: 'Les Demoiselles d'Avignon' is a 1907 oil painting by Pablo Picasso, depicting five nude female prostitutes in a Barcelona brothel. The figures have angular and disjointed body shapes, with one showing Egyptian or southern Asian features, while the others display Iberian and African mask-like characteristics. The painting's confrontational style and ethnic primitivism were intended to create a savage and powerful artistic expression, liberating Picasso's unique artistic approach. It is currently housed in the Museum of Modern Art in New York.

Guernica(Picasso): Guernica is a renowned 1937 oil painting by Pablo Picasso, considered an influential anti-war masterpiece. It is housed at the Museo Reina Sofía in Madrid and is widely acclaimed for its emotional impact and as a poignant symbol against violence and conflict.

The Persistence of Memory: "The Persistence of Memory" is a famous surrealistic painting created by Salvador Dalí in 1931. It is widely known for its melting clocks and is considered one of the most recognizable works of Surrealism. The painting has been part of the Museum of Modern Art's collection since 1934. Often referenced in popular culture, it has alternative titles like "Melting Clocks" or "The Soft Watches."

The Scream: 'The Scream' is a famous artwork created by Edvard Munch in 1893. It is known by its Norwegian title, Skrik (Scream), and was initially exhibited with the German name Der Schrei der Natur. The painting portrays an anguished face and has become an iconic representation of human anxiety. It heavily influenced the Expressionist movement.

The Starry Night: 'The Starry Night' is a renowned oil painting by Vincent van Gogh. Created in 1889, it showcases the view from his asylum room in Saint-Rémy-de-Provence before dawn, including an imaginary village. The piece is a part of the Museum of Modern Art's collection in New York City since 1941. Regarded as Van Gogh's greatest work, 'The Starry Night' is highly recognizable and holds a significant place in Western art history.

A Sunday Afternoon on the Island of La Grande Jatte: 'A Sunday Afternoon on the Island of La Grande Jatte', painted by Georges Seurat from 1884 to 1886, is a renowned example of the pointillist technique. This large canvas masterpiece is considered a significant work of the neo-impressionist movement. The composition depicts Parisians enjoying a park by the River Seine. The artwork is currently housed in the collection of the Art Institute of Chicago.

Water Lilies(Monet series): The Water Lilies series by Claude Monet is a collection of about 250 oil paintings. Monet painted these works in his flower garden at his home in Giverny, France. These paintings were a major focus for him during the final three decades of his life. Notably, many of the artworks were created while Monet battled cataracts.

Campbell's Soup Cans: 'Campbell's Soup Cans' is a famous artwork by Andy Warhol created from November 1961 to June 1962. It consists of 32 canvases depicting hand-painted versions of Campbell's Soup cans, representing all the soup varieties available at that time. This artwork is a significant example of the pop art movement, showcasing Warhol's interest in commercial products and popular culture.

David(Michelangelo): David(Michelangelo) is a renowned Italian Renaissance sculpture made from 1501-1504. It is a colossal marble statue that stands at 5.17 meters, serving as a precedent for future art. Originally intended for Florence Cathedral's east end, it was instead placed in a public square in front of Palazzo della Signoria in Florence. This iconic masterpiece now resides in the Galleria dell'Accademia, while a replica stands at the original location since 1910.

Fountain(Duchamp): Fountain is a famous artwork by Marcel Duchamp, created in 1917. It is a readymade sculpture consisting of a signed porcelain urinal. Duchamp submitted it for an exhibition but it was never displayed. However, it gained recognition through a photograph published in a Dada journal. The original piece has been lost.

Olmec colossal heads: The Olmec colossal heads are stone representations of human heads sculpted from large basalt boulders. They date from at least 900 BC and are a distinctive feature of the Olmec civilization. The heads range in height from 1.17 to 3.4 meters and all depict mature individuals with fleshy cheeks, flat noses, and slightly-crossed eyes. The monuments are thought to represent portraits of powerful Olmec rulers and were likely transported over long distances, indicating significant human effort and resources. Each head has a unique headdress and they were arranged in lines or groups at major Olmec centers. One theory suggests that the distinctive headgear could have been used as protective helmets during warfare or ceremonial Mesoamerican ballgames.

Pietà(Michelangelo): "The Pietà by Michelangelo is a renowned marble sculpture in Saint Peter's Basilica, Vatican City. Depicting Jesus and Mary at Mount Golgotha, it represents the 'Sixth Sorrow' of the Virgin Mary. Considered a significant piece of Italian Renaissance sculpture, it marks the beginning of the High Renaissance era."

Terracotta Army: The Terracotta Army is a collection of sculptures buried with the first emperor of China, Qin Shi Huang, in 210–209 BCE. It depicts his armies and serves as a form of funerary art to protect him in the afterlife.

The Thinker: The Thinker is a famous bronze sculpture by Auguste Rodin, depicting a nude male figure sitting on a rock. The sculpture showcases deep thought and contemplation and is often associated with philosophy.

Venus de Milo: The Venus de Milo, also known as Aphrodite of Melos, is a well-known Greek marble sculpture from the Hellenistic period. Discovered in 1820 on the island of Milos, Greece, it has been displayed at the Louvre Museum since 1821. This statue is considered one of the most renowned ancient Greek sculptures globally.

Venus of Willendorf: The Venus of Willendorf is a small ancient figurine believed to have been created 25,000-30,000 years ago. It was discovered in 1908 during an archaeological dig near Willendorf, Austria. The figurine is made of non-local limestone and is tinted with red ochre. It is currently housed in the Natural History Museum in Vienna.

Bayeux Tapestry: The Bayeux Tapestry is a long embroidered cloth that showcases the events leading to the Norman Conquest of England in 1066. It measures around 70 meters in length and 50 centimeters in height. Created in the 11th century, shortly after the Battle of Hastings, it depicts the rise of William, Duke of Normandy against Harold II, King of England. The tapestry, believed to have been made in England, serves as a gift for William and presents the perspective of the victorious Normans. It has been well-preserved in Normandy for many centuries.

Book of Kells: The Book of Kells is a famous illuminated manuscript from around 800 AD. It contains the four Gospels in Latin, along with other texts and tables. It was made in a monastery in Ireland or Scotland and may have had contributions from various other monastic institutions. The text is mainly from the Vulgate but also includes passages from the Vetus Latina. It is considered a masterpiece of Western calligraphy and Insular illumination. The manuscript gets its name from the Abbey of Kells in County Meath, where it was kept for many years.

The Great Wave off Kanagawa: 'The Great Wave off Kanagawa' is a famous woodblock print by Japanese artist Hokusai, made in 1831 during the Edo period. It portrays three boats navigating a stormy sea, with a towering, spiraling wave at the center and Mount Fuji in the background.

Design: Design is the intentional creation of an object, process, or system. It involves developing a concept and considering various factors such as aesthetics, functionality, and societal impact. Designs have purposes within specific contexts and must fulfill certain goals and constraints. They can be expressed through drawings, diagrams, patterns, or models.

Graphic design: Graphic design is a profession that uses visual communication to convey messages to social groups. It utilizes creativity and innovation using both manual and digital tools, incorporating text and graphics to visually communicate. It is an interdisciplinary branch of design and fine arts.

Typography: Typography is the art of arranging type for legibility and appealing display. It involves selecting fonts, sizes, spacing, and alignment. Type design is a related craft. It can be used decoratively or to communicate information.

Interior design: Interior design is the art of improving building interiors for a healthier and visually pleasing atmosphere. Interior designers coordinate and manage projects involving planning, research, site inspections, programming, and construction management. It is a diverse profession that includes conceptual development and execution of designs, emphasizing effective communication with stakeholders.

Industrial design: Industrial design is the creative process of shaping and defining the appearance and attributes of a product before it is manufactured on a large scale. This involves the design of form and features, which is distinct from the individualized approach of crafts-based design. Industrial design is crucial for efficient and standardized replication, often using automation, in the manufacturing process.

Web design: Web design refers to the creation and maintenance of websites, involving various skills and disciplines. It includes web graphic design, user interface design, coding, user experience design, and search engine optimization. Teamwork is common, though some designers handle all aspects. The term covers front-end design and overlaps with web engineering. Web designers should be knowledgeable about usability and adhere to web accessibility guidelines.

Digital art: Digital art is artistic work that involves the use of digital technology. This can include using digital technology in the creative or presentation process. It can also involve computational art that engages with digital media.

Computer graphics: Computer graphics is the creation of images and artwork using computers. It is widely used in digital photography, film, video games, digital art, and displays in cell phones and computers. Specialized hardware and software have been developed for this field, driving the displays of most devices. The term was coined in 1960 by researchers Verne Hudson and William Fetter. It is often abbreviated as CG or referred to as computer-generated imagery (CGI) in film. It is a recent and extensive area of computer science, encompassing both artistic and non-artistic aspects.

Film: Film is a visual art that utilizes moving images to communicate ideas, stories, and emotions. It is also referred to as cinema and involves the use of sound and occasionally other sensory stimulations.

Animation: Animation is a filmmaking technique that uses still images to create moving images. Traditional animation involves hand-drawn images on transparent sheets to be photographed and shown on film. It is recognized as an artistic medium, commonly used in entertainment. Computer-generated imagery (CGI) is widely used in many animations, while stop motion animation, like claymation, coexists with these forms.

Anime: Anime is Japanese animation that can be hand-drawn or computer-generated. In English, it refers to animation made in Japan, but in Japan, it encompasses all animated works. Similar styles can be found in animation produced outside of Japan, and some video games also have "anime" themes and artstyles.

Film industry: The film industry includes film production companies, studios, cinematography, animation, screenwriting, film festivals, distribution, and actors. Over time, independent film production has grown due to affordable equipment and increased investment opportunities outside the industry.

Silent film: A silent film is a movie without recorded sound. It uses visual storytelling to convey narrative and emotion. If needed, important dialogue or plot points are shown on inter-title cards.

Filmmaking: Filmmaking is the process of producing a motion picture, starting from an initial concept or commission. It involves stages such as screenwriting, casting, shooting, sound recording, and post-production. The director shoots scenes out of order and combines them through editing. Filmmaking is influenced by diverse contexts worldwide and employs various technologies and techniques to create theatrical films, TV shows, music videos, and educational films.

Cinematography: Cinematography is the artistic technique of capturing motion picture images, and it involves the visual aspects of film production.

Special effect: Special effects are visual tricks used in various industries such as theatre, film, TV, video games, amusement parks, and simulators. These illusions create simulations of imagined events within a story or virtual world.

Studio system: The studio system refers to a method of filmmaking where a few major movie studios dominate the production and distribution of films. This was prominent during Hollywood's Golden Age from 1927 to 1948. Studios produced films on their own lots with long-term contracts for creative personnel and controlled exhibition through vertical integration. This involved owning or controlling distributors and exhibition, using techniques like block booking to ensure additional sales of films.

Cinema of Nigeria: The Cinema of Nigeria, known as Nollywood, involves films produced in Nigeria since the late 19th century, including during the colonial era. Its development can be classified into four main eras: Colonial, Golden Age, Video film, and New Nigerian cinema.

Cinema of China: The Cinema of China refers to the film industry in mainland China under the People's Republic of China. It is one of three significant branches of Chinese-language cinema, alongside Hong Kong and Taiwan.

Cinema of India: The cinema of India, composed of films produced by the Indian film industry, has had a significant global impact since the late 20th century. It encompasses various film industries, with Bollywood being one of the largest, producing Hindi language movies. Key film production hubs in India are Mumbai, Hyderabad, Chennai, Kolkata, Kochi, Bangalore, Bhubaneswar-Cuttack, and Guwahati. Indian cinema has consistently ranked first in annual film output worldwide and in 2022, it grossed ₹15,000 crore at the box office.

Hindi cinema: Hindi cinema, also known as Bollywood, is the Mumbai-based film industry that produces movies in the Hindi language. It is a significant part of Indian cinema, encompassing South Indian cinema and smaller film industries. The term Bollywood combines "Bombay" (former name for Mumbai) and "Hollywood" to symbolize its popularity and influence.

Cinema of France: French cinema refers to the film industry and its productions, both within France and by French production companies abroad. It is the oldest and largest precursor to European national cinemas and has had a significant impact on the development of Asian cinemas as well.

Cinema of Japan: The cinema of Japan, also known as hōga, has a rich history of over a century. It is one of the world's oldest and largest film industries, currently ranking as the fourth largest by number of feature films produced. In 2011, Japan produced 411 feature films, earning over half of the box office revenue which amounted to US$2.338 billion. Filmmaking in Japan commenced in 1897 when the first foreign cameramen arrived.

Cinema of the Soviet Union: The cinema of the Soviet Union comprised films from its constituent republics, showcasing their culture, language, and history, under the regulation of the central government in Moscow. Notably, Armenia, Azerbaijan, Georgia, Ukraine, Lithuania, Belarus, and Moldavia produced prolific films. The nationalized film industry adhered to the ideology and laws of the Soviet Communist Party, which introduced socialist realism as a new cinematic approach.

Cinema of the United States: The cinema of the United States has had a significant impact on the global film industry since the early 20th century. American cinema is dominated by classical Hollywood style, which originated from 1910 to 1962 and continues to be prevalent today. It is one of the largest film-producing nations, with over 600 English-language films released annually. Hollywood is considered a transnational cinema, producing movies in multiple languages and often outsourcing production to other countries. Major film studios in Hollywood are known for creating commercially successful and highly popular movies worldwide.

Film festival: A film festival is an organized event where films are presented in one or more cinemas or screening venues. They are usually held in a city or region and can include both new and international films. Some festivals focus on specific filmmakers, genres, or subjects. Short films are also showcased at certain festivals. Film festivals are typically held annually, although they are not considered official film releases by some historians.

Cannes Film Festival: The Cannes Film Festival, originally called the International Film Festival, is an exclusive event held in Cannes, France. It showcases new films of various genres, including documentaries, from around the globe. Founded in 1946, it takes place annually at the Palais des Festivals et des Congrès. The festival gained formal accreditation from the FIAPF in 1951.

Academy Awards: The Academy Awards, also known as the Oscars, are prestigious annual awards presented by the Academy of Motion Picture Arts and Sciences. They recognize excellence in the film industry and are highly regarded worldwide. The awards ceremony takes place in Beverly Hills, California. The Oscar statuette symbolizes a knight in the Art Deco style.

Snow White and the Seven Dwarfs(1937 film): Snow White and the Seven Dwarfs (1937 film) is the first Disney feature film, based on the German fairy tale by the Brothers Grimm. It is a musical fantasy film, animated in full-color cel animation. Supervised by David Hand, the film's sequences were directed by Perce Pearce, William Cottrell, Larry Morey, Wilfred Jackson, and Ben Sharpsteen. It was produced by Walt Disney Productions and released by RKO Radio Pictures.

Mirror(film): 'Mirror' is a 1975 Soviet drama film directed by Andrei Tarkovsky. It is loosely based on the director's life, featuring poems by his father and incorporating unconventional storytelling. The film stars Margarita Terekhova, Ignat Daniltsev, and other notable actors, with voiceover by Innokenty Smoktunovsky and music by Eduard Artemyev.

City Lights: 'City Lights' is a classic silent film from 1931, written, produced, directed, and starred by Charlie Chaplin. The story revolves around the Tramp, as he navigates the challenges of a new romance with a blind girl and forms an unpredictable bond with a wealthy alcoholic man.

Dr. Strangelove: "Dr. Strangelove" is a 1964 political satire film directed by Stanley Kubrick, starring Peter Sellers in multiple roles. It humorously explores the Cold War tensions between the Soviet Union and the United States, with a focus on the fear of nuclear conflict. Loosely based on the novel "Red Alert," the film provides a black comedy take on the potential consequences of such tensions.

The Godfather: 'The Godfather' is a 1972 epic crime film directed by Francis Ford Coppola, based on Mario Puzo's best-selling novel. It stars Marlon Brando, Al Pacino, and James Caan, and is the first film in The Godfather trilogy. The story follows the Corleone family, led by Vito Corleone, as they navigate the mafia world from 1945 to 1955. The film primarily focuses on the transformation of Vito's youngest son, Michael Corleone, from an outsider to a powerful mafia boss.

Triumph of the Will: 'Triumph of the Will' is a 1935 Nazi propaganda film directed by Leni Riefenstahl. Adolf Hitler commissioned it to showcase the 1934 Nazi Party Congress in Nuremberg, attended by over 700,000 supporters. The film includes speeches by Nazi leaders like Hitler, Hess, and Streicher, along with footage of massive SA and SS troops and public response. It emphasizes Germany's resurgence under Hitler's leadership. Produced after the Night of the Long Knives, notable SA members are missing.

: '8½' is a 1963 Italian avant-garde surrealist comedy-drama film directed and co-written by Federico Fellini. It follows the story of Guido Anselmi, a renowned Italian film director struggling with creative block as he tries to make a science fiction movie. The film stars Marcello Mastroianni as Guido, and also features Claudia Cardinale, Anouk Aimée, Sandra Milo, Rossella Falk, Barbara Steele, and Eddra Gale as the women in Guido's life. Shot in black and white, it showcases the cinematography of Gianni Di Venanzo and includes a soundtrack by Nino Rota, along with costume and set designs by Piero Gherardi.

Bicycle Thieves: 'Bicycle Thieves' is a 1948 Italian neorealist drama film directed by Vittorio De Sica. It depicts a poor father's desperate search for his stolen bicycle in post-World War II Rome. Without it, he would lose his job, endangering the future of his young family.

Breathless(1960 film): Breathless (1960 film) is a French New Wave crime drama directed by Jean-Luc Godard. It follows Michel, a criminal, and his American girlfriend Patricia. The film is notable as Godard's debut feature and marked Jean-Paul Belmondo's rise to fame as an actor.

Children of Paradise: 'Children of Paradise' is a French romantic drama film shot during World War II, depicting the lives of a courtesan and four men who adore her in different ways. Set in 1830s Paris, the movie chronicles the intertwined stories of a mime, an actor, a criminal, and an aristocrat, all consumed by their love for her.

Citizen Kane: Citizen Kane, a 1941 American drama film, was directed, produced, and starred in by Orson Welles. It was his first feature film. Considered the greatest film ever made, it held the number 1 spot in the British Film Institute's poll of critics for 50 years and topped the American Film Institute's 100 Years...100 Movies list. The film won an Academy Award for Best Writing and is praised for its innovative cinematography, editing, music, and narrative structure.

L'Atalante: 'L'Atalante' is a renowned 1934 French film by Jean Vigo, featuring Jean Dasté, Dita Parlo, and Michel Simon, and also released under the title 'Le Chaland qui passe'. It is a story written and directed by Vigo, encompassing key elements of love, adventure, and human connection.

La Dolce Vita: "La Dolce Vita" is a 1960 satirical comedy-drama film directed by Federico Fellini, starring Marcello Mastroianni as a journalist searching for love and happiness in the "sweet life" of Rome. The screenplay is organized into a prologue, seven major episodes with an intermezzo, and an epilogue.

The Rules of the Game: "The Rules of the Game" is a notable 1939 satirical comedy-drama film by Jean Renoir, featuring an ensemble cast including Nora Gregor, Marcel Dalio, and Paulette Dubost. It is regarded as a pioneering work in French cinema, known for its witty critique of the bourgeois class and intricate social dynamics.

Tokyo Story: 'Tokyo Story' is a 1953 Japanese drama film directed by Yasujirō Ozu. It revolves around an elderly couple who journey to Tokyo to see their adult children. Starring Chishū Ryū and Chieko Higashiyama, the film explores themes of aging, family dynamics, and the generation gap.

The Apu Trilogy: The Apu Trilogy is a set of three Indian Bengali-language drama films directed by Satyajit Ray: Pather Panchali (1955), Aparajito (1956) and The World of Apu (1959). The films feature original music by Ravi Shankar.

Battleship Potemkin: 'Battleship Potemkin' is a 1925 Soviet silent drama film produced by Mosfilm, directed and co-written by Sergei Eisenstein. It depicts the mutiny in 1905 where the crew of the Russian battleship Potemkin rebelled against their officers.

The Birth of a Nation: 'The Birth of a Nation' is a 1915 American silent film directed by D. W. Griffith and starring Lillian Gish. It was originally titled 'The Clansman' and is based on a novel and play by Thomas Dixon Jr. Griffith co-wrote the screenplay with Frank E. Woods and produced the film with Harry Aitken.

Lawrence of Arabia(film): 'Lawrence of Arabia' is a 1962 epic biographical adventure drama film directed by David Lean and based on the life of T.E. Lawrence, portrayed by Peter O'Toole. It explores Lawrence's experiences in the Arabian Peninsula during World War I and his relationships with key historical figures such as Prince Faisal, played by Alec Guinness. The film was produced by Sam Spiegel, features a star-studded cast including Jack Hawkins, Omar Sharif, and Claude Rains, and has a screenplay by Robert Bolt and Michael Wilson.

Seven Samurai: The film 'Seven Samurai' is a 1954 Japanese epic directed by Akira Kurosawa. Set in 1586 during the Sengoku period, it tells the tale of desperate farmers hiring rōnin to defend against bandits stealing their crops after the harvest.

The Seventh Seal: 'The Seventh Seal' is a 1957 Swedish fantasy film by Ingmar Bergman, set during the Black Death. It follows a knight who plays a game of chess with Death. The title comes from the Book of Revelation, symbolizing the "silence of God."

Psycho(1960 film): Psycho (1960 film) is a renowned American horror movie directed by Alfred Hitchcock. Based on a novel by Robert Bloch, the film stars Anthony Perkins, Janet Leigh, Vera Miles, John Gavin and Martin Balsam. The plot revolves around an encounter between Marion Crane, an embezzler on the run, and Norman Bates, a timid motel owner, and the subsequent investigation led by a private detective, Marion's lover, and her sister.

Vertigo(film): 'Vertigo' is a 1958 American psychological thriller film by Alfred Hitchcock, based on the novel 'D'entre les morts'. It stars James Stewart as retired detective John "Scottie" Ferguson, who suffers from acrophobia and vertigo. Hired as a private investigator, Scottie follows a mysterious woman named Madeleine, leading to a twisted and suspenseful plot.

The Jazz Singer: "The Jazz Singer" is a 1927 American part-talkie musical drama film, directed by Alan Crosland and produced by Warner Bros. It is the first feature-length motion picture to include synchronized recorded music and lip-synchronous singing and speech. Its release marked the rise of sound films and the end of the silent film era. Featuring Al Jolson, the film showcases six songs and is based on a play by Samson Raphaelson. Adapted from his short story, the film's plot revolves around "The Day of Atonement."

Singin' in the Rain: 'Singin' in the Rain' is a classic American musical film directed by Gene Kelly and Stanley Donen. It stars Kelly, Donald O'Connor, and Debbie Reynolds, with a supporting cast including Jean Hagen, Millard Mitchell, and Cyd Charisse. The film portrays Hollywood in the late 1920s, showcasing the challenges faced by actors during the transition from silent films to "talkies".

The Sound of Music(film): The Sound of Music is a 1965 American musical drama film directed by Robert Wise. It stars Julie Andrews and Christopher Plummer and is based on the 1959 stage musical by Richard Rodgers and Oscar Hammerstein II. The film tells the story of Maria von Trapp, a governess who marries Captain von Trapp and their escape from Austria during the Anschluss in 1938.

Casablanca(film): Casablanca is a 1942 romantic drama film set during World War II, directed by Michael Curtiz. The story revolves around an American expatriate who faces a difficult decision: to choose between his love for a woman and helping her resistance leader husband escape from Casablanca. The film is based on the unproduced stage play Everybody Comes to Rick's. It stars Humphrey Bogart, Ingrid Bergman, and Paul Henreid, with notable performances by Claude Rains, Conrad Veidt, Sydney Greenstreet, Peter Lorre, and Dooley Wilson.

Gone With the Wind(film): 'Gone With the Wind' is a 1939 American epic historical romance film based on Margaret Mitchell's novel. Produced by David O. Selznick and directed by Victor Fleming, it is set in the American South during the Civil War and Reconstruction era. The film follows Scarlett O'Hara, a determined daughter of a Georgia plantation owner, in her pursuit of Ashley Wilkes and subsequent marriage to Rhett Butler.

2001: A Space Odyssey: '2001: A Space Odyssey' is a 1968 science fiction film directed by Stanley Kubrick. It was inspired by Arthur C. Clarke's short story "The Sentinel" and explores a voyage to Jupiter by a crew of astronauts and their interaction with a sentient supercomputer named HAL. The film delves into themes of human evolution, artificial intelligence, and encounters with extraterrestrial life.

Metropolis(1927 film): Metropolis is a 1927 German expressionist science-fiction silent film directed by Fritz Lang. It is based on the 1925 novel of the same name by Thea von Harbou. The film stars Gustav Fröhlich, Alfred Abel, Rudolf Klein-Rogge, and Brigitte Helm. Produced by Erich Pommer, it is considered one of the first feature-length science-fiction films. Filming for Metropolis took place over 17 months in 1925-1926 at a cost of over five million Reichsmarks.

Star Wars: Star Wars is a popular American epic space opera franchise created by George Lucas in 1977. It has expanded into a wide range of films, television series, video games, novels, and more. The franchise's fictional universe is incredibly vast and has become a global pop culture phenomenon. Star Wars is also one of the highest-grossing media franchises ever.

The Wizard of Oz(1939 film): The Wizard of Oz (1939 film) is an American musical fantasy movie based on L. Frank Baum's children's novel of the same name. It was directed by Victor Fleming and stars Judy Garland, Frank Morgan, Ray Bolger, Bert Lahr, Jack Haley, Billie Burke, and Margaret Hamilton. The film was produced by Metro-Goldwyn-Mayer (MGM) and features a screenplay by Noel Langley, Florence Ryerson, and Edgar Allan Woolf. The music, composed by Harold Arlen and with lyrics by Edgar "Yip" Harburg, received acclaim.

Stagecoach(1939 film): Stagecoach (1939 film) is a classic American Western directed by John Ford, starring Claire Trevor and John Wayne. It is based on a short story by Ernest Haycox and depicts a group of strangers traveling on a stagecoach through perilous Apache territory.

King Arthur: King Arthur, a legendary British king, is a prominent figure in medieval literature called the Matter of Britain.

Baba Yaga: Baba Yaga is an enigmatic character from Slavic folklore with opposite roles. She can be depicted as a frightening old woman who eats children or a helpful figure. Often associated with forest wildlife, she flies in a mortar, wields a pestle, and lives in a hut on chicken legs deep in the forest.

Santa Claus: Santa Claus is a legendary figure in Western Christian culture. He is also known as Father Christmas, Saint Nicholas, Saint Nick, Kris Kringle, or simply Santa. He brings gifts on Christmas Eve with the help of Christmas elves who make toys in his workshop and flying reindeer who pull his sleigh through the air.

Faust: Faust, a character from a German legend, is based on the real historical figure Johann Georg Faust.

Robin Hood: Robin Hood is a legendary outlaw from English folklore renowned for his archery and swordsmanship skills. He has been depicted as a nobleman or yeoman, and in modern versions, a returning crusader whose lands are confiscated by the Sheriff. Dressed in Lincoln green, he is famous for his acts of robbing the rich to help the poor.

Hua Mulan: Hua Mulan, a renowned figure in Chinese history, is a legendary folk heroine from the Northern and Southern dynasties. Though considered fictional by scholars, her story is depicted in the Wu Shuang Pu by Jin Guliang.

James Bond (literary character): James Bond is a character created by Ian Fleming in 1953, featured as the main protagonist in a series of novels, films, comics, and video games. Fleming wrote a total of twelve Bond novels and two short story collections, with his final two books being published after his death.

Sherlock Holmes: Sherlock Holmes, created by Arthur Conan Doyle, is a fictional British detective known as a "consulting detective." He is highly skilled in observation, deduction, forensic science, and logical reasoning. Holmes uses these talents to investigate cases for various clients, including Scotland Yard.

Peter Pan: Peter Pan is a Scottish-created fictional character who is a spirited and mischievous young boy that can fly and never ages. He leads the Lost Boys on the mythical island of Neverland, where he interacts with fairies, pirates, mermaids, Native Americans, and ordinary children from the outside world.

Tarzan: Tarzan is a mythical character who grows up in the African jungle, raised by great apes known as the Mangani. Despite encountering civilization, he chooses to reject it and becomes a heroic adventurer by returning to the wild.

Winnie-the-Pooh: Winnie-the-Pooh is a beloved fictional teddy bear created by A. A. Milne and E. H. Shepard. His name was first mentioned in a story published in 1925 by London's Evening News. The character is inspired by a toy owned by Milne's son Christopher Robin, purchased from Harrods department store.

Donald Duck: Donald Duck is a beloved cartoon character created by The Walt Disney Company. He is a white duck with a yellow-orange bill, legs, and feet, often seen wearing a sailor shirt and cap with a bow tie. Known for his mischievous and temperamental personality, Donald's speech is sometimes hard to understand. He is considered one of the greatest cartoon characters of all time and even has a star on the Hollywood Walk of Fame. Additionally, he holds the record for appearing in more films than any other Disney character.

Mickey Mouse: Mickey Mouse, created in 1928 by Walt Disney and Ub Iwerks, is an iconic American cartoon character who represents the Walt Disney Company. He is an adorable, anthropomorphic mouse known for his red shorts, yellow shoes, and white gloves. Mickey embodies the spirit of a determined underdog, drawing inspiration from silent film stars like Charlie Chaplin. Despite his small size, he overcomes challenges through clever thinking. With his high-pitched voice, originally provided by Disney, Mickey has become one of the most beloved and recognizable fictional characters worldwide.

Mario: Mario is a popular character created by Japanese game designer Shigeru Miyamoto. He is the mascot of Nintendo and the protagonist of the Mario franchise. Mario is an Italian plumber living in the Mushroom Kingdom with his twin brother, Luigi. Their main goal is to save Princess Peach from the antagonist Bowser, utilizing various power-ups for added abilities.

Batman: Batman is a superhero from DC Comics, created by Bob Kane and Bill Finger. He is Bruce Wayne, a wealthy playboy who seeks justice for Gotham City after the murder of his parents. He trains himself physically and intellectually, taking on a bat persona to fight crime. Batman is aided by allies like Robin and Batgirl, and faces villains such as the Joker, Penguin, and Two-Face.

Spider-Man: Spider-Man is a popular Marvel superhero created by Stan Lee and Steve Ditko, who made his debut in Amazing Fantasy #15. He has appeared in various forms of media such as comic books, TV shows, movies, video games, novels, and plays.

Superman: Superman is a popular superhero featured in American comic books by DC Comics. He was created by Jerry Siegel and Joe Shuster and first appeared in Action Comics #1. Superman has been widely adapted across various forms of media, including radio, novels, films, television, theater, and video games.

Wonder Woman: Wonder Woman is a superheroine created in 1941 by William Moulton Marston and Harry G. Peter for DC Comics. Inspired by Marston's wife and life partner, the character's appearance embodies strength and femininity.

Philosophy: Philosophy is a rational and critical study of fundamental questions about topics like existence, reason, knowledge, value, mind, and language. It examines its own methods and assumptions.

Analytic philosophy: Analytic philosophy, popular in the Western world, is a branch of philosophy that emerged in the early 20th century. It emphasizes analysis and is mainly practiced in the Anglosphere. This approach is distinct from continental philosophy, which encompasses other methods prominent in Europe.

Philosophy of science: The philosophy of science explores the foundations, methods, and implications of scientific knowledge. It examines what qualifies as science, the reliability of theories, and the purpose of scientific inquiry. It also delves into the relationship between science and truth, overlapping with metaphysics, ontology, and epistemology. This field considers metaphysical, epistemic, and semantic aspects of science, while ethical issues like bioethics and scientific misconduct are often studied separately.

Philosophy of mathematics: The philosophy of mathematics studies the nature, foundations, and implications of mathematics, aiming to understand its methods and place in people's lives. It is a broad and unique branch of philosophy due to the logical and structural nature of mathematics.

Philosophy of mind: The philosophy of mind is a branch of philosophy that examines the nature of the mind and how it relates to the body. Key topics explored include the mind-body problem, consciousness, mental events and functions, cognition, and the relationship between the mind and the body.

Philosophy of language: The philosophy of language in analytic philosophy explores the nature of language, its connection to the world, and language users. Key areas of inquiry are meaning, intentionality, reference, sentence structure, concepts, learning, and thought.

Philosophy of religion: Philosophy of religion examines religious traditions and their core themes and concepts. Discussions on this topic originated in ancient times and are found in early philosophical texts. It is connected to various branches of philosophy such as metaphysics, epistemology, logic, and ethics.

Political philosophy: Political philosophy is the philosophical study of government, examining its nature, scope, legitimacy, and the relationships among public agents and institutions. It explores topics such as politics, liberty, justice, property, rights, law, and the enforcement of laws by authority. This field aims to determine what constitutes a legitimate government, the rights and freedoms it should protect, the ideal form of governance, the nature of the law, the duties owed by citizens, and the circumstances under which a government may be rightfully overthrown.

Critical thinking: Critical thinking involves the impartial evaluation of available information and evidence to form a rational judgment. It requires self-directed, disciplined, and reflective thinking, with an aim to overcome personal biases and societal influences. Critical thinkers possess intellectual skills and personality traits that contribute to effective problem-solving and communication. They adhere to high standards of excellence while actively resisting egocentric and sociocentric tendencies.

Western philosophy: Western philosophy encompasses the philosophical ideas and contributions originating from the Western world. It traces its roots back to ancient Greek thinkers, known as the pre-Socratics, and is characterized by its pursuit of wisdom, as reflected in the Greek term "philosophía" meaning "the love of wisdom."

Ancient philosophy: Ancient philosophy encompasses the philosophical thought from early post-classical history. It includes a variety of philosophical traditions and concepts. For more detailed information, please refer to the Wikipedia page on ancient philosophy.

Ancient Greek philosophy: Ancient Greek philosophy, emerging in the 6th century BC, sought to understand the world through reason. It explored diverse subjects like astronomy, mathematics, ethics, politics, and more. Greek philosophy persisted during the Hellenistic and Roman periods, leaving a lasting impact.

Medieval philosophy: Medieval philosophy refers to the philosophical thought that emerged during the Middle Ages, from the 5th to the 14th centuries. It began in Baghdad and France in the 8th century and aimed to rediscover ancient Greek and Roman culture while addressing theological issues and integrating religious and secular knowledge. The study of God was central to the philosophers of this time, regardless of religious background.

Renaissance philosophy: Renaissance philosophy refers to the intellectual movement in Europe from 1400 to 1600. It overlaps with late medieval philosophy, influenced by Albert the Great, Thomas Aquinas, William of Ockham, and Marsilius of Padua. It also bridges early modern philosophy starting with René Descartes and his Discourse on Method in 1637.

Modern philosophy: Modern philosophy refers to the philosophical ideas and thinking that emerged during the modern era, characterized by modernity. It does not adhere to a singular doctrine or school of thought, but shares common assumptions that set it apart from earlier philosophy.

Contemporary philosophy: Contemporary philosophy is the current era of Western philosophy, which emerged in the early 20th century with the growth of professionalization and the prominence of analytic and continental philosophies.

Eastern philosophy: Eastern philosophy encompasses a range of philosophies originating in East and South Asia. It includes dominant traditions like Chinese, Japanese, Korean, and Vietnamese philosophies in East Asia, as well as Indian philosophy in South Asia, Southeast Asia, Tibet, and Mongolia.

Chinese philosophy: Chinese philosophy is a broad philosophical tradition that emerged during the Spring and Autumn period and Warring States period in ancient China. It flourished during the "Hundred Schools of Thought" era, marked by significant intellectual and cultural advancements. While its foundations were laid in the Warring States period, Chinese philosophy has deep historical roots, with elements traceable back thousands of years, including those found in the ancient divination text known as the I Ching.

Indian philosophy: Indian philosophy refers to the philosophical traditions in the Indian subcontinent, which can be classified into two categories: āstika and nāstika schools. The classification is based on criteria such as the acceptance of the Vedas as a valid source of knowledge, belief in Brahman and Atman, and the belief in afterlife and Devas.

Ethics: Ethics is the study of moral phenomena, examining questions about what is morally right and how people should behave. It consists of three branches: normative ethics, applied ethics, and metaethics.

Conscience: Conscience is a cognitive process that evokes emotion and rational associations based on an individual's moral philosophy. It contrasts with immediate sensory perceptions and reflexive responses. It is often described as generating feelings of remorse when actions conflict with personal moral values. The role of conscience in moral judgment before an action and its basis in reason have been debated throughout history, contrasting with romanticism and other reactionary movements post Middle Ages.

Free will: Free will is the ability to freely choose among various courses of action without hindrance or constraints.

Golden Rule: The Golden Rule is a moral principle that advises treating others as you would like to be treated. It is often referred to as an ethics of reciprocity and is a common belief in many religions and creeds throughout history.

Good and evil: "Good and evil" is a common concept in religion, ethics, philosophy, and psychology. In some cultures influenced by Manichaean and Abrahamic religions, evil is seen as the opposite of good, with good triumphing over evil. In Buddhist-influenced cultures, good and evil are considered part of an opposing duality that needs to be transcended through embracing emptiness and recognizing the illusory nature of their existence.

Is–ought problem: The is-ought problem, formulated by David Hume, questions the validity of making moral claims solely based on factual observations. Hume identified a distinction between descriptive and prescriptive statements, making it unclear how one can logically move from what "is" to what "ought to be." Hume's law, also known as Hume's guillotine, asserts that ethical conclusions cannot be derived from purely descriptive facts.

Morality: Morality is the distinction between right and wrong in intentions, decisions, and actions. It consists of standards derived from various philosophies, religions, cultures, or personal beliefs. Morality is often associated with goodness and universal principles of conduct.

Plagiarism: Plagiarism is when someone presents another person's ideas or words as their own. It is seen as a violation of academic and ethical standards, resulting in punishments like expulsion or legal actions.

Value (ethics and social sciences): Value in ethics and social sciences refers to the importance of something or an action, guiding the determination of what is best or the significance of different actions. It influences ethical behavior and intentional activities. Actions' value is dependent on the ethical values of affected objects. Objects with ethical value can be considered as ethical or philosophic goods.

Virtue: A virtue is an excellent trait that can be moral, social, or intellectual and is valued as an important aspect of life. It involves choosing actions based on high moral standards, even when unnecessary from a utilitarian perspective. Cultivating virtues leads to establishing them as habits, and those who possess virtues are considered virtuous. Vice is the opposite of virtue, where a person takes pleasure in habitual wrongdoing.

Wisdom: Wisdom is the capacity to think and behave effectively by utilizing knowledge, experience, understanding, common sense, and insight. It encompasses unbiased judgment, compassion, self-awareness, self-transcendence, and non-attachment. Wisdom is also linked to ethical behavior and benevolence.

Consequentialism: Consequentialism is an ethical theory that judges the rightness or wrongness of an action based on its consequences. According to consequentialists, a morally right act is one that produces a positive outcome. Consequentialism falls under teleological ethics, which claims that the moral value of an act lies in its ability to produce intrinsic value. The key principle of consequentialism is that an act is right if it generates more good than harm compared to other available options. Various consequentialist theories define moral goods differently, such as pleasure, avoidance of pain, satisfying preferences, or the broader concept of the "general good."

Utilitarianism: Utilitarianism is an ethical philosophy that promotes actions aiming at maximizing overall happiness and well-being for the people involved. It emphasizes the importance of achieving the greatest good for the greatest number.

Deontology: Deontology is a moral philosophy that evaluates the morality of an action based on its inherent rightness or wrongness, rather than considering its consequences. It emphasizes following rules and principles, and is often referred to as duty-based or rule-based ethics. Deontological ethics contrasts with consequentialism, utilitarianism, virtue ethics, and pragmatic ethics, prioritizing the importance of the action itself over its outcomes.

Humanism: Humanism is a belief system that emphasizes individuals' democratic right to shape their own lives and gives importance to ethical values.

Nihilism: Nihilism is a philosophical perspective that rejects commonly accepted aspects of human existence, like knowledge, morality, and meaning. It was popularized by Ivan Turgenev's character Bazarov in his novel Fathers and Sons.

Logic: Logic is the study of correct reasoning, encompassing both formal and informal aspects. Formal logic focuses on deductively valid inferences and logical truths, examining how conclusions are drawn from premises based solely on argument structure. Informal logic deals with informal fallacies, critical thinking, and argumentation theory, analyzing arguments expressed in natural language. "A logic" can refer to a formal system articulating a proof system. Logic plays a vital role in philosophy, mathematics, computer science, and linguistics.

Argument: An argument is a logical structure consisting of premises and a conclusion. Its purpose is to provide reasons through justification, explanation, or persuasion to support one's conclusion.

A priori and a posteriori: A priori and a posteriori are Latin phrases in philosophy that classify knowledge based on reliance on experience. A priori knowledge is independent of experience, such as mathematics and reasoning. A posteriori knowledge depends on empirical evidence, like scientific fields and personal knowledge.

Deductive reasoning: Deductive reasoning is the process of drawing logical inferences. If the premises are true, the conclusion must also be true.

Fallacy: A fallacy is faulty reasoning in an argument that seems logical if not noticed. The term originated from Aristotelian philosophy.

Inductive reasoning: Inductive reasoning is a method of deriving general principles or conclusions from observations. Unlike deductive reasoning, which provides certain conclusions, inductive arguments offer probable conclusions based on the evidence provided.

Inference: Inference is a process of reasoning that involves drawing logical consequences from premises. It is divided into deduction, which derives conclusions from known or assumed premises, and induction, which generalizes from specific evidence to a universal conclusion. A third type called abduction, distinguished by Charles Sanders Peirce, involves forming plausible explanations.

Dialectic: Dialectic is a method of reasoned argumentation involving dialogue between individuals with differing views to arrive at the truth. It excludes subjective elements such as emotion and rhetoric. Originating in ancient philosophy, it was further refined during the Middle Ages.

Socratic method: The Socratic method is a dialogue technique that involves questioning and answering to facilitate argumentation and discovery.

Paradox: A paradox is a statement that contradicts itself or defies expectations. Despite logical reasoning, it leads to a seemingly contradictory or unacceptable conclusion. It typically involves interrelated elements that coexist and persist over time, resulting in a lasting unity of opposites.

Epistemology: Epistemology is a branch of philosophy that examines knowledge. It investigates the nature, origin, and extent of knowledge, justification for beliefs, rationality of belief, and related issues. Key areas of debate include analysis of knowledge and its conditions, sources of knowledge and justified belief, structure of justified belief, and philosophical skepticism.

Belief: A belief is a subjective stance or opinion about the truth of a proposition or state of affairs. It can be true or false, and is a mental state separate from active introspection. Beliefs can be assumed without conscious thought, and can also be dispositional rather than occurring in the moment.

Common sense: Common sense refers to practical and rational thinking that is widely shared and used by individuals to perceive, understand, and make judgments about everyday matters. It involves a fundamental ability to assess situations and make logical decisions, commonly held by the majority of people.

Concept: A concept is an abstract idea that serves as a fundamental building block for principles, thoughts, and beliefs. Concepts play a vital role in cognition and are studied in disciplines like linguistics, psychology, and philosophy to understand their logical and psychological structure. This interdisciplinary study of concepts has led to the emergence of cognitive science.

Experience: Experience is a term that refers to conscious events, such as perceptions and practical knowledge. It involves a subject being presented with various objects and their properties. It can include unreal items like hallucinations and dreams. In a restricted sense, experience is identified with sensory consciousness, namely perception. It can also refer to the practical knowledge and familiarity gained through conscious events, particularly through direct perceptual contact with the external world. It is associated with recurrent past acquaintance and the abilities learned through those experiences.

Knowledge: Knowledge is the awareness and understanding of facts, individuals, situations, or practical skills. It includes justified true beliefs and distinguishes itself from opinions and guesses. Philosophical debates surround the concept of justification, its necessity, and alternative definitions, particularly sparked by thought experiments in the latter half of the 20th century.

Opinion: An opinion is a subjective judgment or viewpoint that is not considered factually conclusive. Unlike true statements which are factual, opinions are based on personal beliefs and perspectives.

Paradigm: A paradigm is a set of concepts, theories, research methods, and standards that define legitimate contributions to a field. It originates from the Greek word for "pattern" and is used to illustrate similar occurrences in science and philosophy.

Reason: Reason is the conscious use of logic to draw conclusions and seek the truth. It is a unique human ability involved in activities like philosophy, religion, science, language, mathematics, and art. Reason is often called rationality.

Superstition: Superstition, often deemed irrational or supernatural by non-practitioners, encompasses beliefs and practices related to luck, amulets, astrology, fortune telling, spirits, and other paranormal entities. It involves attributing events to fate or unknown forces, and the notion that unrelated prior events can predict the future.

Thought experiment: A thought experiment is a hypothetical situation used to explore the consequences of a hypothesis, theory, or principle. It helps us imagine what may happen in the future and understand the implications of different choices. Also known as Gedankenexperimente, it enables us to consider alternate courses of action.

Truth: Truth is the quality of aligning with reality. It is commonly attributed to beliefs, statements, and sentences that aim to represent or correspond to reality.

Worldview: A worldview is a person's or society's fundamental cognitive orientation, encompassing their knowledge, culture, and point of view. It includes natural philosophy, existential and normative postulates, themes, values, emotions, and ethics.

Empiricism: Empiricism is an epistemological view that asserts true knowledge comes from sensory experience. It contrasts with rationalism and skepticism, emphasizing the importance of empirical evidence over innate ideas or traditions. Empiricists argue that traditions are rooted in past sensory experiences.

Naturalism (philosophy): Naturalism in philosophy is the belief that the universe is governed only by natural laws and forces. It is also known as ontological naturalism, metaphysical naturalism, pure naturalism, philosophical naturalism, or antisupernaturalism. Naturalism is often considered synonymous with materialism, and it centers on the study of what exists (ontology).

Occam's razor: Occam's razor is a problem-solving principle in philosophy that recommends seeking explanations with the fewest elements possible. It is also known as the principle of parsimony and is attributed to William of Ockham, a 14th-century philosopher. The principle can be summarized as "Entities must not be multiplied beyond necessity" and is often mistakenly paraphrased as "The simplest explanation is usually the best one."

Rationalism: Rationalism is an epistemological view that considers reason as the primary source of knowledge and justification. It emphasizes intellectual and deductive methods over sensory experience, faith, or tradition as a means of acquiring truth.

Reductionism: Reductionism is a philosophical approach that explains complex phenomena by breaking them down into simpler or more fundamental components. It views a system as the sum total of its individual parts.

Metaphysics: Metaphysics is a branch of philosophy concerned with the fundamental principles that define reality. It explores topics such as existence, identity, change, space and time, cause and effect, necessity, actuality, and possibility.

Existence: Existence is the state of being real or actual in reality. It refers to the contrast between being and nonbeing. Another key distinction is between an entity's existence and its essence, which represents the entity's nature or essential qualities.

Ontology: Ontology is the study of being and the existence of entities. It categorizes entities and explores their relationships. Key concepts include categories like substances, properties, relations, states of affairs, and events. Ontologists examine fundamental concepts like particularity and universality, abstractness and concreteness, and possibility and necessity. The concept of ontological dependence is important in determining the fundamental existence of entities. Debates in ontology revolve around the existence and relationships of entities within categories.

Mental representation: A mental representation is a hypothetical internal symbol that represents external reality or its abstractions. It is studied in philosophy of mind, cognitive psychology, neuroscience, and cognitive science.

Reality: Reality refers to everything that is real or exists in the universe, distinguishing it from what is imaginary or non-existent. It also reflects the ontological status of things, indicating their existence. In a physical sense, reality encompasses both known and unknown elements within a system.

Abstraction: Abstraction is the process of deriving general rules from specific examples or methods. It involves obtaining concepts from literal signifiers or fundamental principles.

Determinism: Determinism is the belief that events are entirely caused by preceding factors. It concentrates on specific events and opposes the concept of chance. Indeterminism is the opposite viewpoint, suggesting events occur randomly. Determinism is often compared to free will, with some philosophers arguing their compatibility.

Idealism: Idealism is a metaphysical perspective that asserts that reality is primarily composed of mind or consciousness. It can also be understood as the belief that ideas hold the highest form of reality. This perspective is often credited to Plato and can be found in both Western and Eastern philosophies such as Vedanta and certain streams of Buddhism.

Materialism: Materialism is a philosophical belief that states matter is the basis of everything in the natural world, including thoughts and consciousness. It suggests that the mind and consciousness are a result of material interactions, and without these interactions, they cannot exist. This perspective contrasts with idealism, which posits that consciousness is the fundamental substance of nature.

Monism: Monism is a philosophical concept that attributes oneness or singleness to a particular concept, such as existence. There are different types of monism: 1. Priority monism claims that all existing things originate from a distinct source, like in Neoplatonism where everything comes from "The One." 2. Existence monism asserts that there is only one thing, the universe, which is artificially divided into many things. 3. Substance monism explains various existing things in terms of a single substance or reality, like matter or mind. 4. Dual-aspect monism views the mental and physical as different aspects or perspectives of the same substance. 5. Neutral monism believes that the fundamental nature of reality is neither mental nor physical, but rather "neutral."

Mind–body dualism: Mind–body dualism is a philosophical concept that believes in either the existence of non-physical mental phenomena or the separation of mind and body. It encompasses various perspectives on the connection between mind and matter and is contrasted with physicalism and enactivism in the mind–body problem.

Relativism: Relativism is a philosophical view that rejects objective claims in a particular domain and argues that valuations within that domain depend on the perspective of an observer or the context. It comes in various forms, including moral relativism which deals with differences in moral judgments, epistemic relativism which denies absolute principles of belief and justification, and alethic relativism which rejects absolute truths. Relativism can also be similar to skepticism. Descriptive relativism aims to describe cultural and individual differences without making evaluations, while normative relativism evaluates the truthfulness of views within a specific framework.

Aesthetics: Aesthetics is the philosophy that explores the nature of beauty and taste. It encompasses the philosophy of art and involves critical judgments of artistic value. Its function is to critically reflect on art, culture, and nature.

Beauty: Beauty is the pleasurable quality of objects, like landscapes, humans, and art, that is perceived by individuals. It is a key aspect of aesthetics, a branch of philosophy, and is associated with positive value and contrasted with ugliness.

Meaning (philosophy): Meaning in philosophy refers to the relationship between signs and what they intend or signify. It is studied in sub-fields such as semantics, semiotics, philosophy of language, metaphysics, and metasemantics.

Fact: A fact is a true piece of information about a situation. It can be verified through observation, measurement, or experiments. References are commonly used to verify facts.

Hypothesis: A hypothesis is a proposed explanation for a phenomenon that can be tested using the scientific method. It is based on previous observations that cannot be explained by existing theories. It is distinct from a scientific theory. A working hypothesis is a provisionally accepted hypothesis used as a starting point for further research.

Natural philosophy: Natural philosophy, also known as philosophy of nature, is the study of physics and the physical universe. It was the predominant approach to understanding nature before modern science emerged.

Pseudoscience: Pseudoscience refers to ideas or practices that are presented as scientific and factual, but do not align with the scientific method. It is characterized by exaggerated, contradictory, or unfalsifiable claims and avoids rigorous refutation. Pseudoscience lacks openness to evaluation by experts, lacks systematic development of hypotheses, and persists even when disproven experimentally. It should not be confused with junk science.

Parapsychology: Parapsychology is the study of alleged psychic and paranormal phenomena, like near-death experiences and apparitional experiences. Despite being considered a pseudoscience by many mainstream scientists, parapsychologists continue to claim plausibility despite a lack of convincing evidence after over a century of research.

Theory: A theory is a rational concept that explains a phenomenon through contemplative and rational thinking. It can be scientific or non-scientific, providing generalized explanations of how nature works. The term originates from ancient Greek and has evolved to have various related meanings in modern usage.

Christian philosophy: Christian philosophy is the philosophy conducted by Christians or related to Christianity. It seeks to reconcile science and faith by using natural rational explanations alongside Christian revelation. While some thinkers find a harmonious relationship between science and faith, others see contradictions or try to differentiate them.

Islamic philosophy: Islamic philosophy is a branch of thought originating from the Islamic tradition. It encompasses two terms: falsafa, which includes philosophy, logic, mathematics, and physics, and Kalam, a rationalist form of Scholastic Islamic theology. Key schools within Kalam include Maturidiyah, Ashaira, and Mu'tazila.

Buddhist philosophy: 'Buddhist philosophy' refers to the ancient Indian philosophical system that emerged within Buddhism. It encompasses all the rational inquiries and philosophical investigations that originated in different Buddhist schools after Gautama Buddha's parinirvāṇa. It also includes the subsequent developments influenced by the spread of Buddhism throughout Asia.

Confucianism: Confucianism, also known as Ruism, is an ancient Chinese system of thought and behavior. It is considered a tradition, philosophy, religion, theory of government, and way of life. Confucianism developed from the teachings of the philosopher Confucius in the 5th century BCE, who drew from cultural values inherited from earlier Chinese dynasties. It was suppressed during the Qin dynasty but survived and became the official ideology during the Han dynasty, blending with other influential schools of thought.

Legalism (Chinese philosophy): Legalism, or Fajia, is a school of thought in Chinese philosophy that contributed to the formation of the bureaucratic Chinese empire. It is often compared to political realism and the model-building of Max Weber. The Fajia is associated with "men of methods" who played a role in its development. While lacking a recognized founder, Guan Zhong and Li Kui are considered early influences. The term Fajia refers to a combination of Shen Buhai and Shang Yang as its founding branches.

Phenomenology (philosophy): Phenomenology is a philosophical study that examines the lived and subjective experiences of reality and objectivity.

Theory of forms: The Theory of Forms, developed by Plato, suggests that physical reality is less real than non-physical and timeless "Forms". These Forms are the true essence of all things, while objects in the physical world are mere imitations. Controversial within Plato's dialogues, this theory is seen as a classical approach to understanding universals.

Sophist: Sophists were ancient Greek teachers from the 5th and 4th centuries BC who specialized in various subjects like philosophy, rhetoric, music, athletics, and mathematics. They instructed young statesmen and nobles on achieving excellence or virtue known as arete.

Positivism: Positivism is a philosophical school emphasizing that authentic knowledge is acquired through either factual definition or empirical observations. It dismisses intuition, introspection, and religious beliefs as unreliable sources of understanding.

Pragmatism: Pragmatism is a philosophical tradition that sees language and thought as tools for action and problem solving, rather than reflecting reality. It emphasizes practical uses and successes when examining various philosophical topics like knowledge, language, concepts, meaning, belief, and science.

Skepticism: Skepticism is a questioning attitude towards knowledge claims, where doubts arise about their accuracy. Skeptics do not necessarily disbelieve, but rather suspend belief and maintain a neutral attitude. They are motivated by a lack of sufficient evidence to support a claim. Philosophy, specifically epistemology, extensively studies skepticism.

Stoicism: Stoicism is a philosophy that originated in Ancient Greece and Rome, emphasizing the importance of virtue in achieving a well-lived life (eudaimonia). The practice of four key virtues - wisdom, courage, moderation, and justice - and living in harmony with nature are central to Stoic teachings. Founded by Zeno of Citium around 300 BC in Athens.

Thomism: Thomism is a philosophical and theological school based on the teachings and ideas of Thomas Aquinas. Aquinas was a prominent Dominican philosopher, theologian, and Doctor of the Church.

Religion: Religion encompasses diverse systems with varying beliefs, practices, and organizations that connect humanity to the supernatural and spiritual. It may include elements like sacred texts, moral codes, prophecies, and faith in a divine entity, but there is no unanimous definition or agreement on its constituents and boundaries.

Comparative religion: Comparative religion is the study of the world's religions, focusing on comparing their doctrines, practices, themes, and impacts. It delves into fundamental concerns like ethics, metaphysics, and salvation, while also exploring origins and similarities between different religions. By studying these aspects, it helps gain a deeper understanding of human beliefs and practices related to the sacred and divine.

Folk religion: Folk religion, also known as popular religion or traditional religion, refers to various forms and expressions of religion that differ from organized religious practices. It encompasses ethnic or regional religious customs that exist outside official doctrines and practices.

Mysticism: Mysticism encompasses experiences of unity with the divine or ultimate reality, often through altered states of consciousness or ecstasy. It involves seeking insight into hidden truths and undergoing personal transformation through spiritual practices and experiences.

Theology: Theology is the systematic study of religious belief, taught in universities and seminaries. It analyzes the supernatural, explores religious epistemology, and seeks to answer questions about revelation - the acceptance of divine interaction with the natural world and humankind.

Deity: A deity, also known as a god or goddess, is a sacred and supernatural being that is worshiped. They possess greater powers than humans and interact with them, leading to heightened consciousness and transcending ordinary life.

God: God is the supreme being and object of faith in monotheistic belief systems. In polytheistic beliefs, a god is a spirit or being that created or controls part of the universe. Theism refers to the belief in at least one god.

Goddess: A goddess is a female deity associated with various roles and attributes, such as pregnancy, feminine behavior, beauty, love, motherhood, creativity, and fertility. They are often linked with magic, war, wisdom, earth, sky, power, justice, and more. Some goddesses are also associated with negative aspects like discord or disease. There are countless goddesses with diverse characteristics, just like male or neuter gods.

Fasting: Fasting is the act of refraining from eating and drinking. Physiologically, it can refer to the body's metabolic state after not eating overnight or after complete digestion and absorption of a meal. Metabolic changes occur during fasting.

Celibacy: Celibacy refers to the voluntary choice of being unmarried and abstaining from sexual activity, often for religious reasons. It is typically associated with religious officials or devotees who have taken a sacred vow or renounced worldly desires. However, more broadly, celibacy is commonly understood as simply abstaining from sexual activity.

Heresy: Heresy refers to beliefs conflicting with established religious customs or laws. A heretic is someone who advocates heresy.

Icon: An icon is a religious painting in Eastern Orthodox, Oriental Orthodox, and Catholic churches. Icons are sacred images used for religious devotion, typically depicting Christ, Mary, saints, and angels. They encompass various artistic media and subjects, including portrait-style images, narrative scenes from the Bible or lives of saints, and are regarded as more than mere artworks.

Iconoclasm: Iconoclasm is the belief in destroying icons and images, often for religious or political reasons. Those who engage in or support this belief are called iconoclasts. The term has also been used to describe individuals who challenge cherished beliefs or venerated institutions as erroneous or harmful.

Idolatry: Idolatry refers to the worship of a cult image or idol as if it were a god, particularly in Abrahamic religions. It involves worshiping something other than the Abrahamic God as if it were God and is considered the worship of false gods. This practice is forbidden by religious texts such as the Ten Commandments. Similar rules exist in other monotheistic religions.

Liturgy: Liturgy refers to the customary public rituals of worship performed by religious groups, particularly in the context of Christians. It is a communal response to the sacred, involving activities like praise, thanksgiving, remembrance, supplication, and repentance. Through liturgy, believers establish a relationship with God.

Meditation: Meditation is a mindfulness practice that trains attention and awareness through focusing the mind on an object, thought, or activity. Its goal is to achieve a clear and stable state of mental clarity and emotional calmness.

Pilgrimage: A pilgrimage is a journey to an unfamiliar place, taken by individuals seeking personal growth and enlightenment. It involves exploring oneself, others, nature, or a higher purpose in order to achieve personal transformation. Afterward, the pilgrim returns to their normal life.

Prayer: Prayer is a deliberate communication that seeks to establish a connection with a deity or ancestor through supplication, intercession, thanksgiving, or praise. It is closely associated with meditation and charms/spells in comparative religion.

Prophecy: A prophecy is a message from a supernatural entity to a person, containing divine will or preternatural knowledge. It is found in many cultures and beliefs and can be revealed through visions, divination, or direct interaction with divine beings. Prophetic stories gain attention and can survive for centuries through oral tradition or as religious texts.

Relic: A relic is a religious object from the past, typically the physical remains or personal belongings of a revered individual, which are preserved for veneration. They hold significance in various religions, including Buddhism, Christianity, Islam, and shamanism. The term comes from Latin, meaning "remains" or "abandon", and relics are often housed in shrines called reliquaries.

Religious conversion: Religious conversion is the act of adopting a new set of beliefs associated with a specific religious denomination, while abandoning previous affiliations. This can involve switching from one denomination to another within the same religion, or even transitioning between different religions. It often involves significant rituals and signifies a transformation of religious identity.

Ritual: A ritual is a series of actions or gestures involving revered objects that may be prescribed by a community, including religious groups. It is characterized by formalism, traditionalism, rule-governance, and sacral symbolism. Rituals often involve repetitive performances.

Sacrifice: Sacrifice is the act of offering material possessions, animals, or even human lives to a deity as a form of worship or appeasement. It has been practiced since ancient times and is observed in different religions worldwide. Ritual animal sacrifice has been documented among the Hebrews, Greeks, and other civilizations. Similarly, evidence of ritual human sacrifice has been found in pre-Columbian Mesoamerican and European civilizations. Presently, various religions continue to perform different forms of non-human sacrifices.

Saint: A saint is a person recognized as holy or close to God in Christian belief. The term's usage depends on the context and denomination. In Catholic, Orthodox, Anglican, Oriental Orthodox, and Lutheran beliefs, all faithful deceased in Heaven are considered saints. Some saints are honored or revered more than others. The Catholic Church canonizes saints, while the Eastern Orthodox Church glorifies them after approval.

Veneration of the dead: Veneration of the dead is the act of showing love and respect to deceased individuals, often including one's ancestors. It is rooted in the belief that the departed continue to exist and can influence the well-being of the living. Some cultures venerate their direct relatives, while others venerate saints as mediators between humans and God. The Eastern Orthodox Churches and the Catholic Church also pray for the souls in Purgatory. However, some religious groups view the veneration of the dead as idolatrous and sinful.

Worship: Worship is the act of showing great respect and devotion, commonly associated with religious practices. It can involve reverence towards a divine being or supernatural power, or even admiration for a hero. Worship can include various activities like veneration, adoration, praise, supplication, or submission. It can be as simple as a prayer or as elaborate as a ceremony, performed individually or in a group, led by a designated leader. Ultimately, the main purpose of worship is to honor the subject in some way.

Animism: Animism is the belief that everything, including objects, places, and creatures, has a spiritual essence. It perceives all things as animated and alive, including animals, plants, rocks, and even words. This belief system is practiced by many Indigenous peoples and predates organized religions. Animism focuses on the concept of the immaterial soul in the supernatural universe.

Apologetics: Apologetics is the defense of religious doctrines through logical arguments and discussions. Christian apologists in early times defended their beliefs against critics and invited non-believers to embrace their faith, while in modern times, apologetics is often associated with debates on religion and theology.

Apostasy: Apostasy refers to the formal disaffiliation, abandonment, or renunciation of a religion by an individual. It can involve embracing an opinion contrary to one's previous religious beliefs. Sociologists use the term to describe the renunciation and criticism of a person's former religion, without any negative implications. Individuals who undertake apostasy are known as apostates, and the process is called apostatizing.

Astrology: Astrology is a divinatory practice that claims to gather information about human affairs by studying celestial positions. It originated in ancient calendrical systems and has been used by various cultures throughout history. Western astrology, dating back to Mesopotamia, has spread widely and is associated with personality explanations and event predictions based on celestial objects.

Creation myth: A creation myth is a symbolic narrative explaining the origins of the world and the first humans. It may be considered true by the culture that tells it, conveying profound truths metaphorically, symbolically, historically, or literally. Creation myths often describe the organization of the cosmos from a chaotic state.

Curse: A curse is a wish for misfortune to befall someone, a place, or an object. It can be made effective by supernatural powers or by magic. Curses are often believed to have a causative force and can be reversed through rituals or prayers.

Divination: Divination is the practice of seeking insight through rituals or practices. Diviners interpret signs, events, or omens to guide individuals in making decisions. They claim to connect with supernatural forces like spirits or gods to provide guidance.

Eschatology: Eschatology is the study of beliefs and expectations about the end of the world or human history. It is a topic found in various religions, which predict a climax of negative world events. The belief in an imminent end of the world is known as apocalypticism and is held by mainstream religions and doomsday cults. Eschatology also refers metaphorically to the end of ordinary reality and reunion with the divine in mysticism. While some religions have ideas of renewal or transformation after significant events, the explicit description of a new earth is mostly found in Christian teachings, particularly in the book of Revelation, Chapter 21.

Faith: Faith is a term that encompasses confidence or trust in someone, something, or an idea. It often pertains to belief in God or religious teachings. Merriam-Webster's Dictionary defines faith as a strong conviction in something believed, complete trust, loyalty to God, and a firm belief in something without proof.

Witchcraft: Witchcraft is the use of supernatural powers to perform magic, often for causing harm. It has been a widely accepted concept across various cultures throughout history. The term "witchcraft" is mainly associated with the belief in using magic to inflict misfortune upon others. However, it is largely a product of people's imagination rather than an objective reality. The term has been universalized by anthropologists to include similar beliefs in occult practices in various cultures.

Origin myth: An origin myth is a type of myth that explains the beginnings of a natural or social aspect of the world. It can be a creation myth detailing the formation of the universe or stories that explain the origins of natural phenomena or human institutions. In Greek and Roman scholarship, the terms etiological myth and aition are sometimes used to describe myths that clarify origins of objects or customs.

Religious experience: A religious experience is a subjective, interpreted experience within a religious context. It emerged in the 19th century as a response to increasing rationalism, popularized by William James. It can lead to unverified personal gnosis in certain religions.

Sacredness: Sacredness refers to the quality of being dedicated to a deity, worthy of spiritual respect, or inspiring awe among believers. It is often attributed to objects or places.

Spirituality: Spirituality is a term that has evolved over time and encompasses various meanings. Initially, it referred to religious re-formation to achieve the ideal state of humanity as outlined by different religions. Early Christianity associated it with living in accordance with the Holy Spirit, and later it encompassed mental aspects of life during the Late Middle Ages.

Supernatural: 'Supernatural' refers to phenomena or entities that defy natural laws. The term originated in the Middle Ages and was not used in ancient times.

Totem: A totem is a symbol or sacred object representing a group of people, like a family or tribe, often seen in the Anishinaabe clan system. It can also be a spirit being associated with particular qualities or characteristics.

Burial: Burial, or interment, is the act of burying a body in the ground. The deceased and sometimes objects are placed in a pit or trench, which is then covered. This method of final disposition is often accompanied by a funeral ceremony. Burial is an ancient practice used by humans to show respect for the dead, prevent decay odor, provide closure for family members, and assist the deceased in their journey to the afterlife or the cycle of life.

Cemetery: A cemetery is a designated burial ground where dead people are laid to rest. It can also be referred to as a burial ground, gravesite, graveyard, or memorial park. Originally, the term cemetery came from the Roman catacombs. The term graveyard is often used interchangeably, but it specifically refers to a burial ground within a churchyard.

Cremation: Cremation is the process of disposing of a dead body by using intense heat to reduce it to ashes.

Funeral: A funeral is a ceremony for disposing of a corpse, usually through burial or cremation, accompanied by observances. Funerary customs differ amongst cultures and religions, involving interment, monuments, prayers, and rituals to honor the deceased. Funerals offer support and sympathy to the grieving, while also commemorating and celebrating the life of the departed. They can have religious aspects to aid the departed soul's journey to the afterlife or resurrection.

Mummy: A mummy is a preserved dead human or animal that has been protected from decay by exposure to chemicals or extreme environmental conditions. The term can include both intentional embalming and accidental preservation, dating back to the 17th century.

Afterlife: The afterlife refers to the belief that a person's consciousness or identity continues to exist after their death. Different belief systems attribute varying degrees of importance to the surviving aspect, which can range from partial elements to the entire soul or spirit, carrying one's personal identity. This belief contradicts the idea of complete oblivion after death.

Heaven: Heaven is a supernatural realm where deities, angels, souls, saints, and ancestors originate, reside, or are enthroned. It is believed that earthly beings can ascend there after death, while heavenly beings can sometimes descend to Earth or incarnate.

Hell: Hell is a place or state in the afterlife where souls endure punishment, often through torture. Christianity and Islam view it as an eternal destination, while Dharmic religions see it as a transitional phase between lives. It is depicted as being located either in another realm or beneath the Earth's surface. Other afterlife realms include heaven, paradise, purgatory, limbo, and the underworld.

Reincarnation: Reincarnation, also called rebirth or transmigration, is the idea that the non-physical essence of a living being starts a new life in a different physical form after death. It is believed that the soul does not disperse but instead continues its immortality by being born as a newborn baby or an animal. Transmigration refers to the soul passing from one body to another after death.

Resurrection: Resurrection, or anastasis, refers to the idea of returning to life after death. It is found in several religions, where gods can die and be resurrected. Reincarnation is a related belief where the same person or deity is reborn in a different body. Some religions also believe in the disappearance of the body after death.

Soul: The soul is the spiritual essence of a person, encompassing their identity, personality, and memories. It is believed to be immaterial and able to survive physical death. While primarily associated with humans, the concept of the soul can also be extended to other living or non-living entities.

Altar: An altar is a table or platform used for religious rituals and offerings. It is found in various places of worship including shrines, temples, and churches. Altars are used in several religions such as paganism, Christianity, Buddhism, Hinduism, Judaism, and certain Islamic communities. They also played a significant role in historical-medieval faiths like Roman, Greek, and Norse religions.

Anti-clericalism: Anti-clericalism is the opposition to religious authority, particularly Roman Catholic influence. It relates to secularism, aiming to separate the church from public and political affairs.

Creed: A creed is a statement summarizing the core beliefs of a community and is often referred to as a confession of faith or symbol. It serves as a structured form highlighting the key tenets held by that community.

Cult: A 'cult' is typically a small group led by a charismatic leader who tightly controls its members. They require unwavering devotion to deviant beliefs and practices. The term also encompasses new religious movements or social groups with unusual beliefs, rituals, or common interests. However, the definition is weakly defined and controversial among scholars in various fields of study.

Monastery: A monastery is a building or complex of buildings where monks or nuns live and work. It includes a place for prayer, such as a chapel or church, and often has additional facilities like a dormitory, library, and refectory. Monasteries can range from small communities to vast complexes with various buildings for self-sufficiency and community service, such as schools, agricultural areas, and manufacturing facilities.

Priest: A priest is a religious leader authorized to perform sacred rituals and act as a mediator between humans and deities. They administer religious rites, including sacrifices, and form the "priesthood". Priests may also hear confessions, provide counseling, offer spiritual guidance, teach catechism, and visit the sick.

Schism: A schism is a division between people or organizations, often religious in nature. It can refer to splits within religious bodies, like the Great East–West Schism, as well as divisions in non-religious groups or personal relationships.

Sect: A sect is a subgroup that emerges from a larger religious, political, or philosophical belief system, following distinct rules and principles. Originally used to classify religious separated groups, the term now encompasses any organization that breaks away due to perceived heresy from the larger group.

State religion: A state religion is a religion officially supported by a sovereign state. It does not necessarily make the state a theocracy, as the clergy may not control the government, and the government may not control the religion.

Temple: A temple is a sacred building used for spiritual rituals and activities like prayer and sacrifice. Various religions, including Christianity, Hinduism, Buddhism, Islam, Judaism, and others, have their own temples. Ancient religions like Ancient Egyptian and Ancient Greek also had temples.

Theism: Theism refers to believing in the existence of one or more deities. It usually refers to the idea of a traditional God in monotheistic religions or multiple gods in polytheistic religions. Theism differs from deism by accepting revelation instead of rejecting it.

Deism: Deism is a rationalistic theology that rejects revelation as a source of divine knowledge. It asserts that the existence of God can be determined solely through empirical reason and observation of the natural world. Deists believe in God based on rational thought alone, without relying on revealed religions or religious authority. They emphasize that God's existence is revealed through nature.

Fundamentalism: Fundamentalism refers to the strict interpretation of religious texts, dogmas, or ideologies. It involves prioritizing the distinction between one's own group and others, emphasizing purity, and seeking to restore an idealized past. The term is commonly used to describe unwavering adherence to a set of unchanging beliefs.

Monotheism: Monotheism is the belief that there is only one God who exists separately from the world and intervenes through supernatural means. It can be exclusive, recognizing a single God, or inclusive/pluriform, acknowledging multiple godly forms as extensions of the same God.

Orthodoxy: Orthodoxy refers to the strict adherence to correct beliefs or accepted doctrines, particularly within religious contexts. It entails conforming to established creeds and doctrines, emphasizing the importance of upholding accepted principles.

Paganism: Paganism refers to polytheistic and non-Jewish religious practices in the Roman Empire during the fourth century. It was often associated with rural or non-Christian populations. Terms such as "hellene," "gentile," and "heathen" were used in Christian texts to describe pagans. Ritual sacrifice played a significant role in Graeco-Roman religion and determined one's affiliation as pagan or Christian. Paganism was commonly seen as the religion of the rural peasantry.

Panentheism: Panentheism is the belief that the divine exists in every part of the universe and extends beyond space and time. Coined in 1828 by Karl Krause, it distinguishes itself from pantheism by maintaining an ontological distinction between the divine and the non-divine. Unlike pantheism, which sees the divine and the universe as identical, panentheism emphasizes both the divine's presence in the universe and its significance separate from it.

Polytheism: Polytheism is the belief in and worship of multiple deities or spirits, organized into a pantheon. It is a type of theism that contrasts with monotheism. Polytheists may view their gods as representations of natural forces or ancestral principles. They may worship specific deities or prioritize one at certain times.

Syncretism: Syncretism is the blending of different beliefs and thoughts, often seen in religion, art, culture, and politics. It involves merging diverse traditions to emphasize unity and inclusivity. It allows for an inclusive approach to other faiths and is known as eclecticism in art and culture, and syncretic politics in politics.

Pantheism: Pantheism is a philosophical belief that equates reality, the universe, and nature with divinity. It sees the physical universe as an immanent deity that has been expanding and creating since the beginning of time. Pantheists view everything as a unity and see this unity as divine, comprising a manifested god or goddess. They perceive all astronomical objects as parts of this sole deity.

Atheism: Atheism refers to the lack of belief in the existence of deities. It can also encompass the rejection of belief in any deities or the specific position that no deities exist. Atheism contrasts with theism, which is the belief in the existence of at least one deity.

Agnosticism: Agnosticism is the belief that the existence of God or the supernatural cannot be known or proven. It acknowledges that human reason is insufficient to justify a belief in either the existence or non-existence of God.

Freethought: Freethought is an ideology that rejects forming beliefs based on authority, tradition, revelation, or dogma. Instead, it advocates using logic, reason, and empirical observation to reach conclusions.

Secularism: Secularism is the principle of conducting human affairs based solely on naturalistic considerations, without involvement of religion. It seeks to separate government and religion, emphasizing a non-religious approach to governance.

Judaism: Judaism is the oldest Abrahamic religion, originating in the Middle East during the Bronze Age. It is a monotheistic religion and an ethnic identity for the Jewish people. Derived from Yahwism, a religious movement of ancient Israel and Judah, it is considered one of the oldest monotheistic religions. It comprises spiritual, cultural, and legal traditions and is guided by the Mosaic covenant between God and the Israelites. Jewish doctrine includes a variety of texts, practices, theological beliefs, and forms of organization.

Christianity: Christianity is a global monotheistic religion centered on Jesus' teachings. With 2.4 billion followers, it's the world's largest religion, representing about 31.2% of the population. Christians, found in 157 countries, believe Jesus is the Son of God and the prophesied Messiah mentioned in both the Hebrew Bible and New Testament.

Islam: Islam is a monotheistic religion founded by Muhammad and centered on the Quran. Muslims, its followers, number around 1.9 billion globally, making it the second-largest religious group worldwide, after Christians.

Gnosticism: Gnosticism is a religious movement that emerged in the late 1st century AD among Jewish and early Christian sects. It emphasizes personal spiritual knowledge (gnosis) over the teachings and authority of religious institutions. Gnostics believe in a supreme hidden God and a malevolent lesser divinity who created the flawed material universe. Salvation lies in attaining direct knowledge of the hidden divinity through mystical or esoteric insight, rather than through repentance for sin. Gnostic texts explore the themes of illusion and enlightenment rather than sin and repentance.

Druze: The Druze are an Arab ethnic and religious group from Western Asia. They follow the Druze faith, which is a monotheistic religion that believes in the unity of God, reincarnation, and eternal souls. Their religious practices are secretive, and they do not allow outsiders to convert. Marriage outside the Druze faith is uncommon and discouraged.

Baháʼí Faith: The Baháʼí Faith, founded in the 19th century by Baháʼu'lláh, is a global religion that emphasizes the value of all religions and the unity of humanity. Initially originating in Iran and the Middle East, it has faced ongoing persecution. With an estimated 5 to 8 million followers, known as Baháʼís, it is present in numerous countries worldwide.

Rastafari: Rastafari is a Jamaican Abrahamic religion that emerged in the 1930s. It is considered a social movement and a new religious movement, lacking a central governing body. Followers, called Rastafari, Rastafarians, or Rastas, exhibit diverse practices and beliefs.

Bible: The Bible is a sacred collection of religious texts held important in various religions, including Christianity, Judaism, Islam, and others. It is an anthology of diverse texts written in Hebrew, Aramaic, and Koine Greek, encompassing instructions, stories, poetry, prophecies, and more. The specific materials accepted as part of the Bible differ among religious traditions, forming a biblical canon. While believers consider it divinely inspired, interpretations of the text vary.

Holy Spirit: The Holy Spirit, also called the Holy Ghost, is a divine force in various religions. In Judaism, it represents God's influence over the universe and beings. In Nicene Christianity, it is the third person of the Trinity. In Islam, it acts as a divine agent of action and communication. In the Baha’i Faith, it serves as the intermediary between God and humanity, symbolizing God's grace and emanating rays from His Manifestation.

Messiah: The term 'Messiah' refers to a saviour or liberator in Abrahamic religions. It originated in Judaism and denotes a king or High Priest anointed with holy oil. This concept involves messianism and the anticipation of a Messianic Age.

Sin: Sin is an act that goes against divine or moral laws. Different cultures have varying interpretations of sin. It can include immoral thoughts, words, or actions that are harmful or selfish.

Salvation: Salvation is the act of being saved or protected from harm or dire circumstances. It holds religious significance, referring to the liberation of the soul from sin and its repercussions. The study of salvation is termed soteriology.

Predestination: Predestination is a theological doctrine that states all events are planned by God, including the ultimate destiny of each person's soul. It attempts to resolve the conflict between God's foreknowledge and human free will. It is often seen as a form of religious determinism or predeterminism.

Ten Commandments: The Ten Commandments, also known as the Decalogue, are a vital set of ethical and worship principles found in Judaism, Christianity, and Islam. They are mentioned twice in the Bible, at Exodus 20:2–17 and Deuteronomy 5:6–21.

Old Testament: The Old Testament (OT) is the initial division of the Christian Bible, following the Tanakh, consisting of ancient Hebrew and Aramaic writings by the Israelites. The New Testament, written in Koine Greek, is the second division of Christian Bibles.

New Testament: The New Testament (NT) is the second part of the Christian Bible, focusing on the teachings and life of Jesus, along with events related to early Christianity. It is complemented by the Old Testament, based on the Hebrew Bible, and together they are considered sacred scripture by Christians.

Church (congregation): A church is a religious congregation meeting at a specific location. It is organized, consisting of clergy or lay leaders, and seeks non-profit corporate status in eligible countries.

Catholicity: Catholicity refers to beliefs and practices widely accepted by Christian denominations, particularly those describing themselves as catholic. "Catholic" comes from the Greek word meaning "universal," indicating the Church's proclamation of the complete Christian faith to all people without exclusion. This concept originated from the Nicene Creed and is characterized by its all-encompassing nature. The Vincentian Canon further defines catholicity as what has been believed by all, everywhere, and always.

Purgatory: Purgatory is an intermediate state after death where souls are purified, much like dross being removed from metal in a furnace.

Angel: An angel is a supernatural being in many theistic religions that serves God.

Second Coming: The Second Coming refers to the Christian belief in Jesus returning to Earth following his ascent to heaven. It is rooted in messianic prophecies and is a central aspect of Christian eschatology, while other religions may have different understandings of this event.

Grace in Christianity: Grace in Christianity is a gift from God, given without merit, as an expression of divine favor and love. In Western theology, it is seen as a spontaneous and undeserved help, while in the Eastern Orthodox Church, grace is the uncreated Energies of God. It is understood as the partaking of the Divine Nature and the working of God himself, rather than a material substance.

Trinity: The Trinity is a central Christian doctrine that describes one God existing in three coequal, coeternal, and consubstantial divine persons: God the Father, God the Son (Jesus Christ), and God the Holy Spirit. They share one essence and nature. The Father begets, the Son is begotten, and the Holy Spirit proceeds. This doctrine highlights the distinction and indissoluble unity between the three persons. It teaches that all of creation and grace is a shared action of the three divine persons, with each person manifesting their unique attributes. Everything comes from the Father, through the Son, and in the Holy Spirit.

Catholic Church: The Catholic Church, also called the Roman Catholic Church, is the largest Christian denomination with 1.378 billion baptized members worldwide. It is an ancient and influential institution, shaping Western civilization. Comprising 24 churches, including the Latin Church and 23 Eastern Catholic Churches, it spans over 3,500 dioceses globally. The pope, based in Rome, leads the church as the bishop of Rome and heads the Holy See, the central governing authority. The Holy See's administrative body, the Roman Curia, operates from Vatican City, a small independent enclave within Rome.

Eastern Catholic Churches: Eastern Catholic Churches, also known as Eastern-Rite Catholic Churches, are 23 autonomous particular churches within the Catholic Church. They are distinct from the Latin Church but are in full communion with the Pope. These churches have their own theology, liturgy, and history while being united with each other and the Roman Catholic Church. Eastern Catholics constitute a minority within the Catholic Church, with approximately 18 million members out of the total 1.3 billion Catholics worldwide.

Pope: The pope is the head of the Catholic Church and sovereign of the Vatican City State. His authority is derived from being the successor of Saint Peter, chosen by Jesus to lead the Church. The current pope is Francis, elected in 2013.

Eastern Christianity: Eastern Christianity refers to Christian traditions and church families that emerged in various regions including Western Asia, Eastern Europe, Southeastern Europe, and parts of Africa and Asia. It encompasses diverse religious denominations that originated during classical and late antiquity. Not a single communion, Eastern Christianity developed in multiple areas and does not adhere to a specific religious denomination.

Eastern Orthodox Church: The Eastern Orthodox Church, also known as the Orthodox Church, is the second-largest Christian church, with about 220 million members. It is made up of independent churches led by bishops. It does not have a central authority like the Pope in the Catholic Church, but the Ecumenical Patriarch of Constantinople is recognized as first among equals. The Eastern Orthodox Church has a rich history and strong cultural influence in Eastern and Southeastern Europe.

Greek Orthodox Church: The Greek Orthodox Church is a Christian denomination with three classifications that have historical ties to Greek Christianity or the Eastern Roman Empire.

Russian Orthodox Church: The Russian Orthodox Church, or Moscow Patriarchate, is an autocephalous Christian church with 194 dioceses in Russia. Its leader, the Patriarch of Moscow and all Rus', holds a prominent position.

Oriental Orthodox Churches: The Oriental Orthodox Churches are ancient Christian churches with about 50 million followers globally. They follow the Nicene Christian tradition and adhere to Miaphysite Christology.

Coptic Orthodox Church: The Coptic Orthodox Church is an Oriental Orthodox Christian church based in Egypt, Africa, and the Middle East. The pope of Alexandria leads the church from Saint Mark's Coptic Orthodox Cathedral in Cairo. It follows the Coptic Rite for liturgy, prayer, and devotional practices. With around 10 million members, Coptic Christians form Egypt's largest minority and the largest Christian population in the Middle East and North Africa.

Ethiopian Orthodox Tewahedo Church: The Ethiopian Orthodox Tewahedo Church is the largest of the Oriental Orthodox Churches, with 36-51 million followers in Ethiopia. It originated before European colonization and has been in existence since 330 AD when Christianity was accepted by the Kingdom of Aksum. It is a founding member of the World Council of Churches and has strong ties with other Oriental Orthodox churches.

Protestantism: Protestantism is a Christian branch that emerged from the 16th century Protestant Reformation. It aimed to reform perceived errors and abuses within the Catholic Church.

Anglicanism: Anglicanism is a large branch of Christianity that evolved from the Church of England after the English Reformation. It follows Western Christian practices and has around 110 million followers globally.

Arminianism: Arminianism is a Protestant movement founded in the 17th century by Dutch theologian Jacobus Arminius and his followers, known as Remonstrants. It aimed to moderate Calvinism's doctrine on predestination as expressed in the Remonstrance, a theological statement submitted to the Dutch States General.

Baptists: Baptists are a significant group within evangelical Protestantism known for baptizing only professing Christians through complete immersion. They emphasize individual soul competency, faith in Christ alone, reliance on Scripture, and a democratic church structure. Baptists recognize baptism and communion as their main practices.

Calvinism: Calvinism, or Reformed Christianity, is a Protestant branch founded by John Calvin and other Reformation theologians. It emphasizes God's sovereignty and the authority of the Bible.

Evangelicalism: Evangelicalism is a global interdenominational movement in Protestant Christianity that highlights three key aspects: personal conversion known as "being born again," reverence for the Bible as God's revelation, and the dissemination of the Christian message. The term evangelical derives from the Greek word meaning "good news."

Lutheranism: Lutheranism is a prominent Protestant branch influenced by Martin Luther. It stems from his campaign to reform Catholic practices and beliefs, which triggered the Protestant Reformation in the 16th century.

Methodism: Methodism is a group of Protestant Christian denominations that trace their origins to John Wesley, with George Whitefield and Charles Wesley as early leaders. The name "Methodists" reflects their organized approach to practicing their faith. Methodism began as a revival movement within Anglicanism in the 18th century and later became a separate denomination. It spread globally through missionary efforts and today has approximately 80 million followers worldwide.

Pentecostalism: Pentecostalism is a Protestant Charismatic Christian movement centered on experiencing God through baptism with the Holy Spirit. It is named after the event of Pentecost, when the Holy Spirit descended upon Jesus Christ's followers during the Feast of Weeks in Jerusalem.

Quakers: Quakers are members of the Religious Society of Friends, a Protestant Christian denomination. They believe in the presence of God in every individual and the possibility of divine revelation. Quakers encompass various interpretations of Christianity, including evangelical, holiness, liberal, and traditional beliefs. Some Quakers are Nontheists, practicing spirituality without belief in God. They reject creeds and hierarchies, emphasizing equality among believers. In 2017, there were approximately 377,557 Quakers worldwide, with a significant percentage located in Africa.

Seventh-day Adventist Church: The Seventh-day Adventist Church, a Protestant Christian denomination, distinguishes itself by observing Saturday as the Sabbath. It emphasizes the imminent return of Jesus Christ and holds an annihilationist belief. Formed in 1863 in the USA, it grew out of the Millerite movement. Co-founder Ellen G. White's influential writings still hold high regard within the church.

Nontrinitarianism: Nontrinitarianism refers to a branch of Christianity that does not accept the traditional doctrine of the Trinity. It rejects the belief in God as three distinct persons existing eternally and inseparably united in one being. Some religious groups that appeared during the Protestant Reformation are commonly referred to as antitrinitarian.

Jehovah's Witnesses: Jehovah's Witnesses is a Christian denomination with around 8.6 million members who actively evangelize and over 20.5 million attending the annual Memorial of Christ's death. Led by the Governing Body of Jehovah's Witnesses, they believe in the imminent destruction of the world system at Armageddon and the establishment of God's kingdom as the solution to all human problems. Originating from the Bible Student movement in the late 1870s, the group was founded by Charles Taze Russell and underwent changes under Joseph Franklin Rutherford, leading to the adoption of the name Jehovah's Witnesses in 1931.

Mormonism: Mormonism is a religious tradition and theology founded by Joseph Smith in the 1820s-1830s. It is part of the Latter Day Saint movement of Restorationist Christianity, with roots in Western New York. While the term "Mormonism" has been used to describe different aspects of the movement, the Church of Jesus Christ of Latter-day Saints has recently distanced itself from the label. It encompasses various roles such as a sect, mystery cult, new religion, church, people, nation, and an American subculture, according to historian Sydney E. Ahlstrom.

Unitarianism: Unitarianism is a Nontrinitarian form of Christianity emphasizing a singular God who created the universe. Unitarian Christians believe that Jesus was inspired by God, but he is not equal to God himself. They view Jesus as the savior of humanity.

Church (building): A church is a building used for Christian worship and religious activities. The earliest known Christian church was a house church established between 233 and 256.

Ecumenism: Ecumenism is the belief that Christians from different denominations should collaborate to build closer relationships, promote unity, and encourage cooperation among churches. It encompasses non-denominational initiatives aimed at fostering greater union among Christian denominations.

Baptism: Baptism is a Christian sacrament involving water, symbolizing initiation and adoption into the faith. It can be performed by sprinkling, pouring, or immersion, typically three times. John the Baptist baptized Jesus, and it is considered a sacrament or ordinance in different churches. Trinitarian formula baptism promotes unity among Christians. Baptism is also known as christening, mainly for infants. It serves as a requirement for church membership in some denominations, including Catholic, Orthodox, and Lutheran churches, as well as Baptist denominations.

Eucharist: The Eucharist, also called Holy Communion, is a Christian sacrament believed to have been established by Jesus at the Last Supper. It involves the sharing of bread and wine, symbolizing Jesus' body and blood. This rite is seen as a memorial and is practiced in various forms across different Christian denominations.

Torah: The Torah is the first five books of the Hebrew Bible, including Genesis, Exodus, Leviticus, Numbers, and Deuteronomy. Christians refer to it as the Pentateuch or the Five Books of Moses. In Jewish tradition, it is called the Written Torah. The Torah can be found in the form of a Torah scroll for religious purposes and in bound book form called Chumash, often with rabbinic commentaries.

Hebrew Bible: The Hebrew Bible, also known as the Tanakh or Miqra, is the collection of Hebrew scriptures that includes the Torah, Nevi'im, and Ketuvim. Different branches of Judaism and Samaritanism have different versions of the canon. Examples include the Septuagint, Syriac Peshitta, Samaritan Pentateuch, Dead Sea Scrolls, and the Masoretic Text. The Masoretic Text, compiled in the 10th century, is widely used in Rabbinic Judaism. It is important to note that the term "Hebrew Bible" is often confused with the Masoretic Text, which is a medieval version. This text is considered authoritative by different types of Judaism. The Masoretic Text is primarily in Biblical Hebrew, with a few passages in Biblical Aramaic.

Talmud: The Talmud is a key text in Rabbinic Judaism, serving as the main source for Jewish religious law and theology. It was central to Jewish cultural life and had a profound influence on Jewish thought and daily life in traditional Jewish communities.

Halakha: Halakha, also known as Jewish law, is a collection of religious laws derived from the Written and Oral Torah. It is based on biblical commandments, Talmudic and rabbinic laws, as well as customs and traditions. Halakha guides religious practices, beliefs, and various aspects of daily life.

Kashrut: Kashrut encompasses Jewish dietary laws, specifying which foods are permitted for consumption and how they should be prepared according to Jewish law. Kosher food is deemed acceptable, while non-kosher food is considered treif.

Orthodox Judaism: Orthodox Judaism refers to traditionalist branches of Judaism. It emphasizes belief in the divine origin of the Torah, both Written and Oral, revealed to Moses on Mount Sinai and passed down faithfully through generations.

Conservative Judaism: Conservative Judaism is a Jewish religious movement that emphasizes the authority of Jewish law derived from the consent of the people over divine revelation. It believes that Jewish law, or Halakha, is both binding and subject to historical development. The movement uses modern research methods and considers its approach as the authentic continuation of Halakhic discourse. It values both tradition and flexibility in interpreting Jewish practices. Conservative Judaism also embraces pluralism and lacks a consensus in matters of faith.

Reform Judaism: Reform Judaism, also known as Liberal or Progressive Judaism, is a major Jewish denomination emphasizing the evolving nature of Judaism and prioritizing ethical over ceremonial aspects. It believes in continuous revelation, not limited to the theophany at Mount Sinai, closely linked with human reason. Reform Judaism is highly liberal, placing little emphasis on ritual and personal observance, considering Jewish law non-binding, and valuing individual autonomy. It also embraces external influences and progressive values.

Synagogue: A synagogue is a Jewish house of worship, also known as a shul or temple. It serves as a place for religious services, weddings, and other ceremonies. Synagogues have rooms for study, social activities, administrative purposes, and classrooms for religious and Hebrew studies. They often display artwork and historical items significant to Judaism and the synagogue's history.

Rabbi: A rabbi is a spiritual leader and religious teacher in Judaism. They are ordained by another rabbi and study Jewish history and texts like the Talmud. The role of a rabbi developed during the Pharisaic and Talmudic eras. The term "rabbi" originated in the first century CE. In more recent centuries, the duties of rabbis were influenced by Protestant Christian ministers, leading to the title "pulpit rabbis". Rabbis have important responsibilities such as giving sermons, providing pastoral counseling, and representing the community externally.

Imam: Imam is a leadership position in Islam. Sunni Muslims commonly refer to an Imam as the prayer leader and community guide in a mosque. They lead Islamic prayers, offer religious guidance, and can be anyone who studies Islamic sciences.

Mosque: A mosque or masjid is a place of prayer for Muslims. It can be an indoor or outdoor location where salah (prayers) are performed, typically a covered building but also including open courtyards.

Quran: The Quran, also known as Qur'an or Koran, is Islam's central religious text, believed to be a divine revelation. It comprises 114 chapters with verses and holds immense religious and literary significance. Renowned for its influence on the Arabic language, it is considered one of the finest works in Arabic literature.

Hadith: Hadith, also known as Athar, is a compilation of narrations documenting the words, actions, and approval of Prophet Muhammad. These reports are believed by Muslims to be transmitted through a chain of narrators, providing insights into Muhammad's teachings and practices.

Islamic schools and branches: Islamic schools and branches vary in their interpretations of Islam, including sects, schools of jurisprudence, and theology. These groups differ in their beliefs and practices, sometimes resulting in conflicts or violence. Some groups are organized with a governing body, while others are informal movements. Some sects are ancient, while others are more recent. Non-denominational Muslims do not align with any specific school or branch.

Sunni Islam: Sunni Islam is the largest branch of Islam, followed by 85–90% of Muslims worldwide. Its name is derived from the tradition of Muhammad, known as Sunnah. The primary distinction between Sunni and Shia Muslims originated from a disagreement over Muhammad's succession. Sunnis believe that Abu Bakr was appointed as the next leader, while Shia Muslims maintain that Muhammad appointed Ali ibn Abi Talib as his successor.

Shia Islam: Shia Islam is the second-largest branch of Islam, believing that the Prophet Muhammad named ʿAlī ibn Abī Ṭālib as his successor, which was disputed by other companions. This contrasts with Sunnī Islam, which believes that no successor was appointed and considers Abū Bakr as the first caliph after Muhammad. Shia Muslims are the followers of Shia Islam.

Sufism: Sufism, also called Tasawwuf, is a mystical aspect of Islam that emphasizes spiritual purification, ritualism, asceticism, and esotericism. It can be defined as Islamic mysticism or the inward dimension of Islam, representing the intense interiorization and manifestation of mystical practices within the faith.

Halal: Halal, an Arabic word meaning 'permissible', is in contrast with the term haram in the Quran. It encompasses "the five decisions" - mandatory, recommended, neutral, reprehensible, and forbidden - with varying interpretations among Islamic jurists. Contemporary emphasis is often placed on the simpler halal and haram distinction in Islamic movements and popular literature.

Haram: Haram, an Arabic term, means 'forbidden' and can refer to something sacred inaccessible to impure or uninformed individuals, or to an evil action deemed sinful. It is also associated with the idea of being 'set aside', similar to the Hebrew concept of חרם and the Roman sacer. In Islamic jurisprudence, haram denotes acts forbidden by Allah and is one of the five commandments defining human morality.

Sharia: Sharia is a religious law based on Islamic teachings found in the Quran and Hadith. It is seen as God's unchanging divine law, while fiqh refers to interpretations by Islamic scholars. Fiqh has been developed over time through legal opinions, and Sharia has always been used alongside customary law. It is applied in courts by ruler-appointed judges and integrated with other laws issued by Muslim rulers.

Fiqh: Fiqh refers to Islamic jurisprudence, encompassing human understanding and practices of Sharia (Islamic law) as derived from the Quran and the sunnah. It expands Sharia through interpretation by Islamic jurists and is implemented through their rulings. Fiqh covers rituals, morals, social legislation, economics, and politics in Islam. While Sharia is considered unchangeable, fiqh is considered fallible. Sunni and Shi'a branches have different schools of fiqh. A faqīh is a person trained in fiqh.

Allah: 'Allah' is the Arabic word for God, particularly in Islam. It is believed to be derived from 'al-ilāh', meaning "the god," and is linguistically connected to the Aramaic words Elah and Syriac ܐܲܠܵܗܵܐ (ʼAlāhā), as well as the Hebrew word for God, El (Elohim).

Five Pillars of Islam: The Five Pillars of Islam are fundamental practices considered mandatory for all Muslims. These include the Muslim creed, prayer, charity, fasting during Ramadan, and the pilgrimage to Mecca (for those able). They are universally followed, although the Shia have different names for them.

Hajj: The Hajj is a yearly Islamic pilgrimage to Mecca, Saudi Arabia, the holiest city for Muslims. It is a mandatory duty for physically and financially capable adult Muslims to undertake at least once in their lifetime. They must support their family during their absence from home.

Hinduism: Hinduism, an ancient Indian religion, is both a religious and universal way of life. It is believed to be the oldest religion in the world, known as sanātana dharma, with origins beyond human history as revealed in Hindu texts. The term 'Hindu' is an exonym, while 'Vaidika dharma' is another endonym for Hinduism.

Buddhism: Buddhism is an Indian religion based on the teachings attributed to the Buddha. It began in the 5th century BCE and spread across Asia. With over 520 million followers, it is the fourth-largest religion worldwide, representing seven percent of the global population.

Jainism: Jainism, an Indian religion known as Jain Dharma, is guided by twenty-four tirthankaras, with the first being Rishabhadeva. It is considered eternal and is based on three main pillars: non-violence, non-absolutism, and asceticism. Jainism's history dates back millions of years, with significant figures like Parshvanatha in the 9th century BCE and Mahavira around 600 BCE.

Sikhism: Sikhism, also called Sikhi, is a religion and philosophy from Punjab, India, founded in the late 15th century CE. It is one of the newest and largest religions globally, with 25-30 million followers.

Taoism: Taoism, an indigenous Chinese tradition, is both a philosophy and a religion that emphasizes living in harmony with the Tao, an enigmatic process underlying reality. It includes various practices like meditation, astrology, and internal alchemy. The goal is self-cultivation and a deeper appreciation of the Tao, leading to a more harmonious existence. Taoist ethics emphasize virtues such as effortless action, naturalness, simplicity, and compassion. Taoist terms may lack easy definitions, often having multiple translations.

Shinto: Shinto is an indigenous East Asian religion from Japan, often seen as a nature religion. It lacks a central authority and its practitioners are diverse in belief and practice.

Manichaeism: Manichaeism, an ancient religion, was established in the 3rd century CE by the prophet Mani in the Sasanian Empire, becoming a significant global faith.

Dharma: Dharma, a fundamental concept in Indian religions, encompasses multiple meanings. It refers to behaviors aligned with the harmonious "order and custom" that sustains life. Dharma also encompasses "virtue" and encompasses religious and moral duties.

Karma: Karma is a concept found in Indian religions that emphasizes the principle of cause and effect. It highlights that an individual's intentions and actions have consequences in their future. Good deeds and intentions lead to positive outcomes and happiness, while bad deeds result in negative consequences. However, in some scriptures, karma is not connected to rebirth. Karma should not be confused with fate or predestination.

Om: Om is a sacred symbol in Hinduism representing a powerful sound and invocation. It embodies the essence of the supreme Absolute, Brahman, and is considered a sonic representation of the divine. Found in Vedas and other Hindu texts, Om is significant in Vedic authority and soteriological practices.

Qi: Qi, also known as ch'i or chi, is a vital force believed to exist in all living things in Chinese culture. It is often translated as "vital energy" or "vital force" and relates to the concept of "energy". Qi is important in traditional Chinese medicine and martial arts, and its cultivation and balance are pursued through qigong.

Swastika: The swastika is an ancient symbol used in various Eurasian, African, and American cultures. It is recognized as a symbol of the German Nazi Party in the West, but its origins lie in Asian cultures. Neo-Nazis worldwide still use it. In Indian religions like Hinduism, Buddhism, and Jainism, it represents divinity and spirituality. The swastika takes the form of a cross with equal and perpendicular arms, each bent at a right angle.

Yin and yang: The term 'Yin and yang' refers to interconnected opposing forces in Chinese philosophy. It is a foundational concept for critical reasoning in traditional Chinese medicine, helping to diagnose diseases and illnesses effectively.

Mantra: A mantra is a sacred utterance or sound that practitioners believe possesses religious or spiritual power. It can be a syllable, word, or group of words with or without literal meaning. Some mantras have a specific structure, while others do not.

Tantra: Tantra is an ancient practice originating in India that incorporates esoteric yogic techniques. It emerged during the 1st millennium CE and is found in both Hinduism and Buddhism.

Yoga: Yoga is a ancient Indian practice that aims to control and calm the mind. It includes physical, mental, and spiritual practices and is found in various schools of Hinduism, Buddhism, and Jainism. It is widely practiced globally.

Brahmin: In Hinduism, Brahman is the highest universal principle and ultimate reality. It is the immaterial cause of everything and the unchanging truth behind all changes. Brahman binds the diverse universe into a single unity.

Shaivism: Shaivism is a major Hindu tradition that worships Shiva as the Supreme Being. It is one of the largest Hindu denominations and incorporates various sub-traditions, from devotional dualistic theism to yoga-based monistic non-theism. Shaivism regards both the Vedas and Agama texts as significant sources of theology. It is the second-largest Hindu sect, with approximately 253 million followers, constituting about 26.6% of all Hindus.

Shaktism: Summary: Shaktism is a significant Hindu denomination that portrays the metaphysical reality, or the godhead, as symbolically feminine.

Vaishnavism: Vaishnavism, a major Hindu denomination, identifies Vishnu as the supreme being among other deities. Its followers, called Vaishnavites or Vaishnavas, revere Vishnu and believe in his leadership. Vaishnavism includes sub-sects like Krishnaism and Ramaism, centered around Krishna and Rama as supreme beings respectively. With approximately 751 million adherents, Vaishnavism is the largest Hindu sect, constituting about 80% of Hindus according to a 2023 estimate.

Vedanta: Vedanta is an orthodox school of Hindu philosophy that focuses on knowledge and liberation. It emerged from the speculations and concepts found in the Upanishads. Vedanta is based on the authority of three texts: the Upanishads, the Brahma Sutras, and the Bhagavad Gita. It encompasses various schools of thought.

Vedas: The Vedas are ancient religious texts from India, written in Vedic Sanskrit. They are the oldest scriptures in Hinduism and form the oldest layer of Sanskrit literature.

Upanishads: The Upanishads are ancient Sanskrit texts that mark a shift from Vedic ritualism to new religious ideas in Hinduism. They are the latest addition to the Vedas, the oldest scriptures of Hinduism, and discuss topics like meditation, philosophy, consciousness, and spiritual knowledge. Unlike earlier Vedic texts, which focused on rituals and ceremonies, the Upanishads explore deeper concepts and the nature of existence.

Bhagavad Gita: The Bhagavad Gita is a Hindu scripture consisting of 700 verses. It is part of the Mahabharata, specifically chapters 23-40 of book 6 known as the Bhishma Parva. The scripture is believed to date back to the second half of the first millennium BCE.

Ramayana: The Ramayana is an ancient Indian epic, considered one of the two important Hindu epics. It tells the life story of Rama, a prince from Ayodhya in the kingdom of Kosala. Rama's exile, along with his wife Sita and brother Lakshmana, his wife's abduction by Ravana, the ensuing war, and Rama's triumphant return to Ayodhya are pivotal events in the epic. Written by Maharishi Valmiki, it is a significant smriti text in Indian literature.

Kumbh Mela: The Kumbh Mela is a major Hindu pilgrimage and festival celebrated every 12 years at four river-bank sites: Prayagraj, Haridwar, Nashik, and Ujjain. It involves a ritual dip in the rivers, but also includes community fairs, religious discourses, and mass gatherings of monks. Participants believe that bathing in the rivers cleanses them of past mistakes and sins.

Mahayana: Mahāyāna is a broad group of Buddhist traditions and practices originating in ancient India. It is one of the three main branches of Buddhism, alongside Theravāda and Vajrayāna. Mahāyāna incorporates early Buddhist teachings while also recognizing additional texts and doctrines not accepted by Theravāda. These include the Mahāyāna sūtras, which emphasize the bodhisattva path and Prajñāpāramitā. Vajrayāna, a subset of Mahāyāna, uses tantric methods to aid in achieving Buddhahood.

Zen: Zen is a form of Buddhism that started in China and later spread to Vietnam, Korea, and Japan. It originated as the Chan School and emphasizes the practice of meditation and attaining enlightenment through direct experience.

Theravada: Theravada is the oldest school of Buddhism, widely accepted and practiced. Its followers, called Theravādins, have meticulously preserved Gautama Buddha's teachings for more than 2,000 years in the Pāli Canon.

Vajrayana: Vajrayana, also called esoteric or tantric Buddhism, is a Buddhist tradition originating in India and spreading to Tibet, Nepal, East Asia, and Mongolia. It emphasizes the use of complex rituals, mantras, and visualizations to achieve enlightenment quickly.

Avalokiteśvara: Avalokiteśvara is a significant bodhisattva in Buddhism, known for his great compassion. Also called Lokeśvara and Chenrezig, he is closely related to Amitabha Buddha. Avalokiteśvara appears in different forms and is considered a source of Hindu deities in some texts.

Four Noble Truths: The core teachings of Buddhism, known as the Four Noble Truths, explain that suffering (dukkha) is inherent in the cycle of attachment, and it arises with craving (taṇhā). However, suffering can end through the release and cessation of this craving. The path (marga) leading to the end of suffering involves the confinement of craving.

Nirvana: Nirvana is an Indian religious concept representing the ultimate state of liberation from suffering and the cycle of birth and rebirth.

Diamond Sutra: The Diamond Sutra is a highly influential Buddhist text known for its teachings on wisdom and emptiness. It belongs to the Prajñāpāramitā genre and is widely translated and studied across various countries. In East Asia, it holds great significance in the Chan tradition, alongside the Heart Sutra.

Pali Canon: The Pali Canon is the primary collection of scriptures in Theravada Buddhism, written in Pali language. It is considered the most comprehensive surviving early Buddhist canon and is associated with the Tamrashatiya school.

Guru Granth Sahib: The Guru Granth Sahib is the sacred scripture of Sikhism, considered the final and eternal Guru by Sikhs. It was compiled by Guru Arjan, the fifth guru, and completed in 1604. It was first installed in the Golden Temple in Amritsar, with Baba Buddha as the first Granthi. Guru Gobind Singh, the tenth guru, added hymns of Guru Tegh Bahadur to it, renaming it the Guru Granth Sahib.

Golden Temple: The Golden Temple, also called Harmandir Sahib or Darbār Sahib, is a gurdwara situated in Amritsar, Punjab, India. As the primary spiritual site of Sikhism, it holds immense religious significance. Alongside Gurdwara Darbar Sahib Kartarpur and Gurdwara Janam Asthan, it ranks among the holiest places for Sikhs.

Tao Te Ching: The Tao Te Ching is a Chinese classic text that is considered the foundational work of Taoism. It was written around 400 BC by the sage Laozi, although there is debate about its authorship and the dates of composition and compilation. Some parts of the text are believed to have been written or compiled after the late 4th century BC, as evidenced by archaeological findings.

Zhuangzi(book): The Zhuangzi is a significant Taoist text, written in China during the late Warring States period (476–221 BC) by "Master Zhuang." It is a foundational text of Taoism, along with the Tao Te Ching. Comprised of stories and maxims, the Zhuangzi illuminates the essence of the ideal Taoist sage.

Kojiki: The Kojiki is an ancient Japanese chronicle that explores myths, legends, genealogies, and semi-historical accounts. It delves into the origin of the Japanese archipelago, the kami and the imperial line. Considered the oldest existing literary work in Japan, it was composed by Ō no Yasumaro in the 8th century at the request of Empress Genmei.

Chinese folk religion: Chinese folk religion, also known as Chinese popular religion, encompasses a wide range of traditional practices followed by Han Chinese and the Chinese diaspora. It involves the worship of spirits and ancestors, exorcism rituals, and a belief in the order of nature and balance in the universe. Deities and immortals are revered, representing various aspects of life, and their stories form Chinese mythology. This religious system emerged during the Song dynasty, blending Buddhist and Taoist teachings. While the Chinese government currently tolerates popular religious organizations that promote social stability, it suppresses or persecutes those that could potentially undermine it.

Haitian Vodou: Haitian Vodou is an Afro-Caribbean religion that emerged in Haiti between the 16th and 19th centuries. It blends elements of West and Central African traditional religions with Roman Catholicism through a process of syncretism. Vodouists, also called Vodouisants or Serviteurs, practice this religion, which is characterized by its lack of a central authority and the diversity among its followers.

Shamanism: Shamanism is a religious practice where practitioners connect with the spirit world through altered states of consciousness. They aim to bring spiritual energies into the physical world to assist with healing, divination, and helping humans.

Spiritualism: Spiritualism is a 19th-century social religious movement that believes in the continuation of an individual's awareness after death. It holds that spirits can be contacted and that the spirit world is dynamic. Spiritualists believe that spirits are more advanced than humans and can provide insight on moral, ethical, and divine matters. They often rely on specific spirits known as "spirit guides" for spiritual guidance. Emanuel Swedenborg is considered a key figure in the development of Spiritualism.

Traditional African religions: Summary: Traditional African religions encompass the diverse beliefs and practices of African people, which are primarily oral and passed down through generations via folk tales, songs, and festivals. These religions involve the worship of spirits, gods (both higher and lower, and sometimes a supreme being), and the veneration of the dead. They also incorporate the use of magic, traditional African medicine, and have animistic, polytheistic, and pantheistic elements. The objective of humanity in these religions is to maintain harmony between nature and the supernatural.

Yoruba religion: The Yoruba religion, also known as Orisa or Isese, is the traditional religious and spiritual system of the Yoruba people from Southwestern Nigeria. It encompasses various practices and beliefs and is mainly centered in Yorubaland, which includes parts of Nigeria, Benin, and Togo.

Zoroastrianism: Zoroastrianism, an ancient Iranian religion, follows the teachings of prophet Zoroaster. It believes in a dualistic cosmology of good and evil within a monotheistic framework. Zoroastrianism worships Ahura Mazda, a benevolent god of wisdom, and recognizes Angra Mainyu as a destructive adversary. It influenced other religious systems and philosophies with its distinctive monotheism, messianism, belief in free will, judgement after death, and concepts of heaven, hell, angels, and demons.

Avesta: The Avesta is the main collection of religious texts of Zoroastrianism, written in the Avestan language.

Prehistoric religion: Prehistoric religion refers to the religious practices of ancient cultures before the development of written records. It makes up over 99% of human experience, primarily during the Paleolithic period. These cultures existed for millions of years and had diverse religious practices. The lack of written records makes studying their faiths challenging.

Ancient Egyptian religion: Ancient Egyptian religion was a polytheistic system with about 1500 deities. It involved rituals and offerings to gain favor with the gods. The pharaohs acted as intermediaries between people and gods, maintaining Ma'at, the order of the cosmos, and repelling chaos. The state invested heavily in religious rituals and temple construction.

Ancient Greek religion: Ancient Greek religion included beliefs, rituals, and mythology in both public religion and cult practices. The application of the term "religion" to ancient Greece is debated, as the Greeks did not have a word for it in the modern sense. Greek writers did not classify gods or cult practices as separate religions. Instead, they referred to common shrines, sacrifices, and customs observed by the Hellenes.

Ancient Mesopotamian religion: Ancient Mesopotamian religion refers to the original religious beliefs and practices of ancient civilizations in Mesopotamia, including Sumer, Akkad, Assyria, and Babylonia between 6000 BC and 400 AD. It was a consistent and coherent tradition that evolved over millennia, adapting to the needs of its followers. This religious development was not greatly influenced by external movements.

Aztec religion: The Aztec religion is a polytheistic and monistic pantheism centered around the concept of teotl, with a supreme god called Ometeotl. It includes a diverse pantheon of lesser gods and nature representations. The popular religion emphasizes mythology and polytheism, while the state religion supports monism for the upper classes and allows for heterodoxies among the people.

Ancient Celtic religion: The term 'Ancient Celtic religion' refers to the religion of the ancient Celtic peoples in Europe. It is also known as Celtic paganism. Since there are no surviving native records of their beliefs, our understanding comes from archaeology, Greco-Roman accounts, and early Christian literature. Celtic paganism was part of a wider group of polytheistic religions in Iron Age Europe.

Germanic paganism: Germanic paganism, also known as Germanic religion, was the traditional belief system of the Germanic peoples spanning over a thousand years across Scandinavia, the British Isles, modern Germany, and parts of Europe. The beliefs and practices varied, influenced by neighboring cultures like the Celts, Romans, and later, Christianity. Limited authentic sources exist, posing challenges for understanding the precise details and continuity between Germanic paganism, Norse paganism, and Indo-European religion.

Maya religion: Maya religion is an ancient belief system practiced by the Maya peoples in Guatemala, Belize, Honduras, and Mexico. It has evolved over centuries, blending with Roman Catholicism. With roots dating back over 2,500 years, it was once widespread among indigenous kingdoms. Today, it coexists with the Pan-Maya movement and various forms of Christianity.

Old Norse religion: Old Norse religion, also known as Norse paganism, was a branch of Germanic religion. It developed during the Proto-Norse period as the North Germanic peoples separated from the rest of the Germanic peoples. It was later replaced by Christianity during the Christianization of Scandinavia. Scholars study this ancient religion through historical linguistics, archaeology, toponymy, and records left by North Germanic peoples, including runic inscriptions. Norse mythology, which is a part of this religion, is recorded in numerous Old Norse works from the 13th century.

Religion in ancient Rome: Religion in ancient Rome encompassed diverse religious practices, observed by both Romans and those under their dominion. This included a blend of imperial and provincial rituals, shaping the spiritual beliefs and customs of the ancient Roman civilization.

Religion in pre-Islamic Arabia: Pre-Islamic Arabia featured a diverse religious landscape with indigenous Arabian polytheism, ancient Semitic religions, Christianity, Judaism, Mandaeism, and Zoroastrianism coexisting.

Slavic paganism: Slavic paganism is the ancient religious beliefs, myths, and rituals of the Slavs prior to their conversion to Christianity. It existed from the 8th to the 13th century, with Christianization occurring at different times. The South Slavs initially came into contact with Eastern Christianity in the Balkan Peninsula, while the East Slavs adopted Christianity under the rule of Vladimir the Great in Kievan Rus'.

Western esotericism: Western esotericism is a term used to categorize various loosely related ideas and movements that developed in Western society. It is distinct from orthodox Judeo-Christianity and rationalism of the Enlightenment era. It has influenced Western philosophy, mysticism, religion, pseudoscience, art, literature, and music.

Freemasonry: Freemasonry is a fraternal organization that originated in the 14th century, initially governing stonemasons' qualifications and interactions with authorities. Contemporary Freemasonry is divided into Regular Freemasonry, which requires belief in a Supreme Being, excludes women, and avoids religious and political discussions, and Continental Freemasonry, which has fewer or no such restrictions.

New Age: The New Age movement is a diverse and evolving spiritual movement that gained popularity in the Western society during the early 1970s. Its beliefs and practices are highly eclectic and difficult to define precisely. While some scholars consider it a religious movement, its followers view it as a spiritual path that unifies the mind, body, and spirit. They seldom refer to themselves as part of the New Age, and some prefer to see it as a cultural milieu or spirit of the times.

New religious movement: A new religious movement (NRM) is a modern spiritual group that is separate from the dominant religion in its society. It can be a unique religion or part of a larger one. Some NRMs emphasize individualism, while others emphasize strong community bonds. There are thousands of NRMs worldwide, ranging from small groups to those with millions of followers.

Falun Gong: Falun Gong, also known as Falun Dafa, is a new religious movement founded by Li Hongzhi in China in the early 1990s. With its global headquarters located in Dragon Springs, New York, this movement covers a 427-acre compound near Li Hongzhi's residence.

Modern paganism: Modern paganism, also called contemporary paganism or neopaganism, is a diverse family of religions influenced by ancient European and nearby cultures. It encompasses various beliefs, practices, and texts, and is often referred to as new religious movements. Scholars differ on whether to view it as multiple religions or as a single religion with different denominations.

Wicca: Wicca, also known as "The Craft," is a modern pagan religion developed in England during the first half of the 20th century. It is considered a new religious movement and part of Western esotericism. Introduced in 1954 by Gerald Gardner, a British civil servant, Wicca is an earth-centered religion that incorporates ancient pagan and hermetic influences into its rituals and theological beliefs.

Satanism: Satanism is a set of religious, ideological, and philosophical beliefs centered around Satan, the devil in Christian belief. It involves the worship or veneration of Satan and the temptation of humans into sin. Historically, the term was used by Christians to accuse their ideological opponents. Modern self-identified Satanism began with the founding of the atheistic Church of Satan in the United States in 1966 by Anton LaVey. This group does not believe in a literal Satan. Satanism can be connected to paganism, ceremonial magic, and other occult practices like Set, Lilith, Hecate, and Chaos.

Folklore: Folklore is a collection of oral traditions, tales, myths, legends, proverbs, poems, and jokes shared by a specific group of people or culture. It also encompasses material culture, like traditional building styles.

Myth: A myth is a type of folklore or theology that includes important narratives in a society, like origin myths or foundational tales. It is different from the common usage of "myth" as something untrue. The truth value of a myth is not a defining factor, making it distinct from other types of storytelling.

Comparative mythology: Comparative mythology is the study of myths across cultures, aiming to uncover shared themes and characteristics. It serves academic purposes such as tracing religious and cultural developments, proposing common origins for myths, and supporting psychoanalytical theories.

Australian Aboriginal religion and mythology: Australian Aboriginal religion and mythology encompasses the divine spirituality woven into the rituals and stories of Indigenous Australians, practiced by various language groups across the country. It includes sacred elements such as the Dreamtime, songlines, and oral literature.

Chinese mythology: Chinese mythology refers to the collection of myths and legends that have been passed down orally or through literature in Greater China. It contains diverse stories from different regions and cultures, often featuring extraordinary individuals and creatures with magical abilities. These tales commonly unfold in mythical realms or ancient times. Chinese mythology, like other mythologies, was historically considered a partially factual account of history. It is closely linked to Chinese folk religion and Taoism, particularly in older variants. Many ancient stories have both a mythological and a more historical interpretation.

Egyptian mythology: Egyptian mythology is a collection of ancient Egyptian myths that explain their understanding of the world through the actions of the gods. These myths are an integral part of their religion, appearing in various forms of writings and art. However, most sources only offer incomplete accounts or fragments of these myths.

Greek mythology: Greek mythology is a collection of stories from ancient Greece that explain the origin of the world, the lives of gods and heroes, and the rituals of the ancient Greeks. It is intertwined with Roman mythology and is studied by scholars to gain insights into ancient Greek religion and society.

Japanese mythology: Japanese mythology is a compilation of ancient tales and beliefs from the Japanese archipelago, influenced by the Shinto traditions and centuries of contact with Chinese and Indian myths.

Korean mythology: Korean mythology encompasses written and oral traditions. Written mythology focuses on the founding monarchs of historical kingdoms, while oral mythology consists of sacred narratives sung by shamans and priestesses in rituals invoking gods.

Mythologies of the Indigenous peoples of the Americas: The Indigenous peoples of the Americas have diverse cultures and mythologies, featuring common themes like close connection with nature and belief in a varied Great Spirit.

Norse mythology: Norse mythology, derived from Old Norse religion and continuing after Christianization, includes myths, deities, and heroes of North Germanic peoples. It stems from Proto-Germanic folklore and encompasses various sources, such as medieval manuscripts and archaeological representations. The mythology mentions notable gods like Thor, Odin, and Freyja.

Persian mythology: Persian mythology, also known as Iranian mythology, consists of ancient myths told by Persians and other Iranian peoples. It explores the origin of the world, the lives of deities, heroes, and mythical creatures. These myths also shed light on religious and political institutions in present-day Iran and other regions influenced by Persian culture. The Persosphere, including parts of West Asia, Central Asia, South Asia, and Transcaucasia, has been impacted by Persian culture through historical dynasties and settlements.

Roman mythology: Roman mythology refers to the myths and legends of ancient Rome, depicted in literature and art. It encompasses a wide range of folklore genres and can also refer to the modern study of these representations. It draws inspiration from the mythology of the Italic peoples and even traces back to Proto-Indo-European mythology.

Abraham: Abraham, a prominent figure in Judaism, Christianity, and Islam, is regarded as the common patriarch of these Abrahamic religions. He established a significant bond between Jews and God in Judaism, served as the spiritual ancestor for all believers in Christianity, and holds a crucial position in the lineage of Islamic prophets.

Adam and Eve: 'Adam and Eve' are the legendary first man and woman in the Abrahamic creation myth. They represent the shared ancestry of all humanity and are the foundations for beliefs like the fall of man and original sin, primarily in Christianity. However, these concepts are not integral to Judaism or Islam.

Lilith: Lilith is a female figure in Mesopotamian and Jewish mythology, often referred to as the first wife of Adam. She is known as a primordial she-demon and was banished from the Garden of Eden for refusing to obey Adam.

Cain and Abel: Cain and Abel were the first sons of Adam and Eve. Cain was a farmer and Abel was a shepherd. They both made sacrifices to God, but God favored Abel's sacrifice. Enraged, Cain murdered Abel and was condemned to a life of wandering. He settled in the land of Nod, built a city, and became the father of Enoch, starting a new lineage.

Daniel (biblical figure): Daniel is the protagonist of the Book of Daniel in the Hebrew Bible. He was a noble Jewish youth from Jerusalem who was captured by Nebuchadnezzar II of Babylon. Daniel served the king and his successors with loyalty and skill, remaining faithful to the God of Israel. While some believe he was a real person and the book was written in the 6th century BCE, most scholars see him as a fictional character and the book as a cryptic reference to the reign of Antiochus IV Epiphanes in the 2nd century BCE.

David: David, the third king of the United Kingdom of Israel, is a biblical figure who likely lived around 1000 BCE. Limited information is available about him from historical records.

Elijah: Elijah - a biblical prophet and miracle worker from ancient Israel during King Ahab's reign.

Ezra: Ezra, also known as Esdras, was a significant Jewish scribe and priest during the early Second Temple period. His Aramaic name, Azaryahu, means "Yah helps." In Greek, he is called Ésdrās, which later became Esdras in Latin.

Isaac: Isaac, a patriarch of the Israelites, is a significant figure in Judaism, Christianity, and Islam. He was the son of Abraham and Sarah, and the father of Jacob and Esau. He is also known as the grandfather of the twelve tribes of Israel.

Isaiah: Isaiah, an Israelite prophet of the 8th-century BC, lent his name to the biblical Book of Isaiah.

Ishmael: Ishmael, the first son of Abraham and Hagar, plays a significant role in Abrahamic religions. He died at the age of 137, according to the Genesis account.

Jacob: Jacob, also known as Israel, is a patriarch in Abrahamic religions. He is a central figure in Judaism, Samaritanism, Christianity, and Islam. Jacob is the son of Isaac and Rebecca, and the grandson of Abraham, Sarah, and Bethuel. He is presented as the second-born twin, with his brother Esau being the elder. Jacob acquired Esau's birthright and deceived his father for his blessing with his mother's aid. Eventually, due to a drought, Jacob and his descendants, aided by his son Joseph, relocated to Egypt, where he passed away at 147 years old. He is believed to be buried in the Cave of Machpelah.

Joseph (Genesis): Joseph (Genesis) is a prominent character in the Bible's Book of Genesis and the Quran, being the beloved son of Jacob and Rachel. He is the progenitor of the Israelite Tribe of Joseph and his story explains why Israel resided in Egypt. Due to jealousy, his brothers sell him into slavery, leading to his incarceration in Egypt. However, after skillfully interpreting Pharaoh's dreams, Joseph becomes second-in-command and saves Egypt from famine. Consequently, Jacob's family seeks refuge in Egypt, ultimately settling in the Land of Goshen through Joseph's influence.

Moses: Moses, revered in multiple religions, is a highly significant figure known as the key prophet in Judaism, Christianity, Islam, Druze faith, Baháʼí Faith, and other Abrahamic religions. He led the Israelites and is credited with receiving the divine Torah, which holds immense importance in religious teachings.

Noah: Noah is a significant figure in Abrahamic religions, representing the last patriarch before the Great Flood. His story appears in the Hebrew Bible, the Quran, and Baha'i writings. He is also mentioned in several other biblical texts, including the New Testament and deuterocanonical books.

Satan: Satan, also known as the Devil, is an entity in Abrahamic religions who tempts humans into sin or falsehood. In Judaism, Satan is a metaphor for evil inclination and subservient to God. In Christianity and Islam, Satan is seen as a fallen angel who rebelled against God and has temporary power over the fallen world and demons. In the Quran, Shaitan is a fire entity cast out of Heaven for refusing to bow before Adam and influences humans to sin through whisperings.

Solomon: Solomon, also called Jedidiah, was an ancient Israelite monarch and the successor of King David. He ruled over an amalgamated Israel and Judah from 970–931 BCE. Solomon's reign led to the split of the Israelites, with the Kingdom of Israel in the north and the Kingdom of Judah in the south. His descendants continued to rule over Judah.

Yahweh: Yahweh is an ancient deity worshipped by the Israelites. Scholars believe Yahweh emerged as a "divine warrior" associated with various regions before being linked to Canaan. His worship dates back to at least the early Iron Age, possibly even earlier, during the Late Bronze Age.

Anansi: Anansi is a spider character from Akan folklore associated with wisdom, trickery, and storytelling. Originating in Ghana, Anansi tales were brought to the Caribbean through the slave trade. Known as a clever trickster, Anansi uses his cunning and wit to defeat stronger opponents. Despite his mischief, Anansi is both the protagonist and antagonist, often taking the lead in the stories.

Tengri: Tengri is the all-encompassing god of heaven in Turkic, Mongolic, and other nomadic Altaic beliefs. Although not considered a deity in the usual sense, Tengri personifies the universe and is associated with being the judge, source of life, and eternal. European and Muslim writers identify Tengri as a deity for Turkic and Mongolic peoples. According to Mongolian belief, Tengri's will can transcend laws and intervene on earth by choosing someone.

Jade Emperor: The Jade Emperor, also known as Yudi or Yu Huang, is an important deity in Chinese culture and mythology. He is regarded as the primary god and is represented as the first god in traditional religions.

Three Sovereigns and Five Emperors: The Three Sovereigns and Five Emperors were revered ancient rulers and sages in China, regarded as cultural heroes and divine ancestral spirits in ancient times. They were believed to have existed before the Xia dynasty, and were thought to have aided the Chinese people even in later periods as incorporeal beings. Key figures include Nüwa, a spirit in the Shang dynasty, and Shennong, identified as the godly form of Hou Ji and a Zhou founder.

Yellow Emperor: The Yellow Emperor, known as Huangdi, is a mythical Chinese ruler considered a cultural hero. He is part of the legendary Three Sovereigns and Five Emperors and is worshipped as an individual deity in Chinese religion. According to jesuit missionaries and Chinese chronicles, Huangdi's traditional reign dates are estimated to be around 2697–2597 BC.

Amun: Amun, an important Egyptian deity, was a member of the Hermopolitan Ogdoad. He became the patron deity of Thebes, replacing Montu, during the 11th Dynasty.

Anubis: Anubis, an Ancient Egyptian god, is known as a canine-headed deity. He is associated with funerary rites, protection of graves, and guiding souls in the underworld.

Hathor: Hathor, a major goddess in ancient Egyptian religion, had diverse roles. She was the mother or consort of the sky god Horus and the sun god Ra, symbolizing the pharaohs' mothers. As the Eye of Ra, she protected him with a vengeful aspect. She also represented music, dance, joy, love, sexuality, and maternal care, and was the companion of male deities. Hathor assisted souls in transitioning to the afterlife, embodying Egyptian femininity.

Horus: Horus, an ancient Egyptian deity, was revered as a god of kingship, healing, protection, the sun, and the sky. Worshiped from prehistoric Egypt to Roman times, Horus took on different forms throughout history, each regarded as a separate god. Egyptologists believe these forms represented distinct attributes of a complex deity, which the ancient Egyptians saw as complementary facets of reality. Horus was often depicted as a falcon, specifically a lanner or peregrine falcon, or as a man with a falcon head.

Isis: Isis was a goddess in ancient Egyptian religion, worshipped in the Greco-Roman world as well. She played a significant role in the Osiris myth, resurrecting her brother/husband Osiris and protecting their son Horus. She aided the dead in entering the afterlife and was considered the divine mother of the pharaoh. Isis was invoked for healing spells and had a limited role in royal rituals but was prominently involved in funerary practices. She was depicted as a human woman with a hieroglyphic headpiece and later wore Hathor's headdress.

Osiris: Osiris was an ancient Egyptian god associated with fertility, agriculture, the afterlife, and resurrection. He was depicted as a green-skinned deity with a pharaoh's beard, partially mummy-wrapped at the legs, wearing an atef crown, and holding a crook and flail. He became connected with the mummy wrap and was revered until the decline of ancient Egyptian religion with the rise of Christianity.

Ra: Ra, an ancient Egyptian deity, was the god of the sun, ruling over the entire created world including the sky, Earth, and the underworld. By the Fifth Dynasty, he became one of the most significant gods in Egyptian religion, symbolizing the midday sun. He was also associated with order, kingship, and the sky, and was believed to have been the first pharaoh of Ancient Egypt.

Thoth: Thoth, an ancient Egyptian deity, was depicted as a man with the head of an ibis or baboon. He was revered as the god of the Moon, wisdom, knowledge, writing, hieroglyphs, science, magic, art, and judgment. His feminine counterpart was Seshat, and his wife was Ma'at.

Achilles: Achilles, a hero of the Trojan War, was the greatest Greek warrior in Greek mythology. He was the son of Thetis and Peleus, and was raised in Phthia with his friend Patroclus. He received his education from the centaur Chiron and was the commander of the Myrmidons in Homer's Iliad.

Aeneas: Aeneas is a Trojan hero, son of the Trojan prince Anchises and the Greek goddess Aphrodite. He is mentioned in Homer's Iliad and has a significant role in Roman mythology, particularly in Virgil's Aeneid. Aeneas is considered an ancestor of Romulus and Remus, and he is recognized as the first true hero of Rome. Additionally, Snorri Sturluson identifies him with the Norse god Víðarr of the Æsir.

Heracles: Heracles, also known as Hercules in Rome, was a legendary hero in Greek mythology. He was the divine son of Zeus and Alcmene, and a descendant of Perseus. Heracles was revered as the greatest Greek hero and defended the Olympian order against chthonic monsters. His lineage gave rise to the Heracleidae royal clans. His cult extended to Rome, where he became a figure of emulation for the Roman emperors, including Commodus and Maximian.

Odysseus: Odysseus, known as Ulysses in Latin, is a legendary Greek king of Ithaca and the hero in Homer's epic poems, the Odyssey and the Iliad. He also plays important roles in other works of the same epic cycle.

Perseus: Perseus is a legendary Greek hero who founded the Perseid dynasty. He was one of the greatest heroes, known for slaying monsters before Heracles. Perseus beheaded the Gorgon Medusa to secure a reward and rescued Andromeda from a sea monster. He was the son of Zeus and mortal Danaë, and also had a connection to Heracles.

Titans: The Titans were pre-Olympian gods in Greek mythology, born from Uranus and Gaia. There were six male Titans and six female ones. Cronus, a male Titan, mated with his sister Rhea, giving birth to the first generation of Olympians. Some descendants of the Titans, like Prometheus and Atlas, are also referred to as Titans.

Aphrodite: Aphrodite, an ancient Greek goddess, represents love, beauty, desire, and fertility. She is associated with Venus in Roman mythology. Symbolized by seashells, roses, doves, and swans, her worship originated from the Phoenician goddess Astarte. Aphrodite's main temples were in Cythera, Cyprus, Corinth, and Athens, and her primary festival was the Aphrodisia. In some regions, she was also worshipped as a warrior deity. Aphrodite became the patron goddess of prostitutes, but the notion of "sacred prostitution" is now considered inaccurate.

Apollo: Apollo is a Greek and Roman god associated with archery, music, truth, healing, the Sun, and more. Son of Zeus and Leto, he is the twin brother of Artemis. Known as the kouros ideal, Apollo is considered the most beautiful god. In Etruscan mythology, he is called Apulu.

Artemis: Artemis is the ancient Greek goddess associated with the hunt, nature, childbirth, and chastity. She is also linked to the moon and often depicted roaming the forests with her nymph companions. In Roman mythology, she is known as Diana.

Athena: Athena is an ancient Greek goddess associated with wisdom, warfare, and handicraft. She was later syncretized with the Roman goddess Minerva. Athena was revered as the patron of various Greek cities, particularly Athens, and is symbolized by owls, olive trees, snakes, and the Gorgoneion. In depictions, she appears wearing a helmet and holding a spear.

Demeter: Demeter is the Greek goddess of harvest, food, and fertility. She is also associated with health, birth, marriage, and the Underworld. Demeter is the second child of Titans Rhea and Cronus, and sister to Hestia, Hera, Hades, Poseidon, and Zeus.

Hephaestus: Hephaestus is the Greek god associated with various crafts such as blacksmithing and sculpture, as well as fire, metallurgy, and volcanoes. He is considered to be either the son of Zeus and Hera or Hera's parthenogenous child. Hephaestus was cast off Mount Olympus due to his lameness, caused either by a congenital impairment or by his actions to protect Hera from Zeus. His Roman counterpart is Vulcan.

Hera: Hera, a powerful goddess in ancient Greek religion, is known for her roles as the protector of women during childbirth and the queen of the Olympians. As Zeus's sister and wife, she exhibits a jealous and vengeful nature, particularly towards Zeus's lovers and illegitimate children.

Hermes: Hermes is an Olympian god in Greek mythology who is known as the herald of the gods and protector of various roles including travelers, thieves, merchants, and orators. With his winged sandals, he can swiftly move between mortal and divine realms. Hermes also serves as a psychopomp, guiding souls into the afterlife.

Poseidon: Poseidon is a deity in Greek mythology, associated with the sea, storms, earthquakes, and horses. He protected seafarers and guarded various cities. He was worshipped as a major deity in Pylos and Thebes and had the title "earth shaker." In Arcadia, he was revered as a horse and god of the waters. Poseidon was known for his control over horses and ability to create springs with his trident. The Roman equivalent of Poseidon is Neptune.

Zeus: Zeus is the ancient Greek sky and thunder god, reigning as the king of the gods on Mount Olympus. His name is derived from the first part of his Roman counterpart Jupiter.

Hades: Hades is a prominent figure in ancient Greek religion and mythology, known as the god of the dead and ruler of the underworld. He is the eldest son of Cronus and Rhea. Alongside his brothers Zeus and Poseidon, Hades defeated the Titans and claimed joint rulership over the cosmos. Hades was given control over the underworld, while Zeus ruled the sky and Poseidon the sea. Often depicted with a bident and wearing his helm, Hades is accompanied by Cerberus, the three-headed guard-dog of the underworld.

Jupiter (god): Jupiter (god) is the ancient Roman god of the sky, thunder, and king of the gods. He held the utmost importance in the Roman state religion from the Republic to the Imperial eras until Christianity took over. Jupiter played a significant role in establishing key religious principles, including offerings and sacrifices, through negotiations with Numa Pompilius, the second king of Rome.

Mars (mythology): Mars, in Roman mythology, is the god of war and agriculture. He is the son of Jupiter and Juno, and held a prominent place among the military gods of ancient Rome. His festivals were celebrated in March and October, marking the start and end of the seasons for both warfare and farming.

Minerva: Minerva, the Roman goddess, embodies wisdom, justice, victory, and the support of arts, trade, and strategy. She is associated with strategic warfare, unlike the violent Mars. The Romans identified her with the Greek goddess Athena. Among the Capitoline Triad, Minerva stands alongside Jupiter and Juno.

Venus (mythology): Venus is a Roman goddess associated with love, beauty, and fertility. She is viewed as the ancestor of the Roman people through her son, Aeneas. Important in religious festivals, Venus holds numerous cult titles and was claimed as an ancestor by Julius Caesar.

Brahma: Brahma, a Hindu god, is known as "the Creator" in the Trimurti alongside Vishnu and Shiva. Associated with creation, knowledge, and the Vedas, Brahma plays a significant role in creation legends. According to some Puranas, he formed himself as a golden embryo called the Hiranyagarbha.

Vishnu: Vishnu, a principal Hindu deity, is also known as Narayana and Hari. He is revered as the supreme being in Vaishnavism, a major tradition of Hinduism.

Shiva: Shiva, also known as Mahadeva, is a principal deity in Hinduism and the Supreme Being in Shaivism, a major tradition within the religion.

Ganesha: Ganesha, also called Ganesh, Ganapati, Vinayaka, or Pillaiyar, is a highly revered deity in Hinduism and the main god in the Ganapatya sect. He is widely worshipped throughout India and respected by various Hindu denominations, as well as Jains, Buddhists, and others.

Kali: Kali, a significant deity in Hinduism, represents time, change, creation, power, destruction, and death. She is associated with Shaktism and holds the foremost position among the ten Mahavidya goddesses in the Hindu tantric tradition.

Krishna: Krishna is a prominent deity in Hinduism, considered the eighth avatar of Vishnu and also worshipped as the Supreme God. He is revered for his role as a protector and symbolizes qualities like compassion, tenderness, and love. Celebrated annually on Krishna Janmashtami, his birthday falls in late August or early September according to the Hindu calendar.

Rama: Rama is a prominent deity in Hinduism, worshipped as the seventh avatar of Vishnu. He holds great popularity and is revered as the Supreme Being in Rama-centric traditions.

Enki: Enki is the Sumerian god associated with water, knowledge, crafts, and creation. He is also part of the Anunnaki pantheon. In Akkadian religion, he is known as Ea or Ae, and some scholars identify him with Ia in Canaanite religion. In Greek sources, he is referred to as Aos.

Enlil: Enlil, also known as Elil, is an ancient Mesopotamian god associated with wind, air, earth, and storms. He was worshiped by various civilizations and his primary center of worship was the Ekur temple in Nippur. Enlil was considered so holy that even other gods couldn't look upon him. He rose to prominence during the twenty-fourth century BC but declined after Nippur was sacked in 1230 BC. He was eventually replaced as the chief god by the Babylonian deity Marduk.

Inanna: Inanna is an ancient Mesopotamian goddess associated with love, war, fertility, beauty, sex, divine law, and political power. Worshiped in Sumer and known as Ishtar by the Akkadian Empire, Babylonians, and Assyrians, her prominent title is "the Queen of Heaven."

Coyote (mythology): Coyote is a mythological figure found in the Indigenous cultures of North America, representing a male anthropomorphic character based on the coyote animal. He possesses distinct coyote-like traits - fur, pointed ears, a tail, yellow eyes, and blunt claws. This legendary being is featured in diverse myths and legends that differ across various cultures.

Great Spirit: The Great Spirit is a concept of a supreme being or life force present in indigenous cultures in Canada and the United States. It is known by different names and interpretations vary among different cultures. In Lakota, it is called Wakan Tanka and in Algonquian it is called Gitche Manitou. Some refer to it as the Great Mystery.

Quetzalcoatl: Quetzalcoatl is a deity in Aztec culture, associated with wind, Venus, Sun, merchants, arts, crafts, knowledge, and learning. He is the patron god of the Aztec priesthood and one of the major gods in the Aztec pantheon alongside Tlaloc, Tezcatlipoca, and Huitzilopochtli. Additionally, Tlaloc and Xolotl are also represented by the planet Venus.

Odin: Odin is a revered god in Germanic paganism, associated with wisdom, healing, death, royalty, knowledge, and war. He is also connected to the runic alphabet and is depicted as the husband of the goddess Frigg. Known by various names in different Germanic languages, Odin ultimately means 'lord of frenzy' or 'leader of the possessed'.

Thor: Thor is a significant god in Germanic paganism, known for wielding a hammer and associated with lightning, thunder, storms, sacred groves and trees, strength, protection of humankind, hallowing, and fertility. Also referred to as Þórr, Thunor, Thuner, or Donar in various languages, his name ultimately means 'Thunder' in Proto-Germanic.

Freyja: Freyja is a Norse goddess known for her associations with love, beauty, fertility, war, and gold. She owns the necklace Brísingamen, rides a chariot pulled by cats, and is accompanied by a boar named Hildisvíni. With her husband Óðr, she is the mother of two daughters - Hnoss and Gersemi. Freyja, a member of the Vanir, possesses a cloak made of falcon feathers. Variations of her name include Freya, Freyia, and Freja.

Amaterasu: Amaterasu is the goddess of the sun in Japanese mythology, often regarded as the main deity of the Shinto pantheon. She is prominently featured in Japan's earliest literary texts as the ruler of the heavenly realm and the mythical ancestor of the Imperial House. Amaterasu is part of the "Three Precious Children" alongside her siblings, the moon deity Tsukuyomi and storm god Susanoo, symbolizing their significance as offspring of the creator god Izanagi.

Legendary creature: A legendary creature is a mythical being, often a mix of different creatures, mentioned in folklore but lacking evidence. It may also appear in historical records predating modern times.

Centaur: A centaur, or occasionally hippocentaur, is a mythical creature from Greek mythology. It has a human upper body and the lower body and legs of a horse, and was believed to reside in Thessaly's mountains. The centaurs were named after Centaurus and were seen as relatives of the legendary Lapith tribe.

Death (personification): Death is often personified as a force in various mythologies. It is commonly depicted as the Grim Reaper, responsible for collecting souls. Some view death as a benevolent figure, guiding souls to the afterlife. Death is typically portrayed as male, but can be seen as female in certain cultures. It is also one of the Four Horsemen of the Apocalypse. Claims of encountering death are frequently reported in near-death experiences.

Demon: A demon is a malevolent supernatural entity that appears in various forms of religious, occult, and fictional narratives throughout history. It is found in literature, mythology, folklore, and popular media like comics, video games, movies, and TV series.

Devil: A devil is the embodiment of evil in different cultures and religions. It represents a hostile and destructive force, and there are four main interpretations: as a separate evil entity, as a part of God, as a created being becoming evil, and as a symbol of human evil.

Dragon: Dragons are large magical creatures found in the folklore of various cultures. In Western cultures, they are often depicted as winged, horned, and able to breathe fire. Eastern cultures portray them as wingless, intelligent serpentine creatures. Dragons possess a mix of feline, reptilian, mammalian, and avian qualities. Scholars believe that large extinct or migrating crocodiles are the closest resemblance to dragons, particularly when spotted in forests or swamps, and likely serve as the inspiration for Asian dragon imagery.

Fairy: A fairy is a legendary creature found in European folklore, described as anthropomorphic and possessing supernatural qualities.

Ghost: A ghost is a spirit or soul of a deceased person or animal that can appear to the living. They can vary from invisible to translucent or realistic forms. People try to contact them through necromancy or séances. Other terms for ghosts include apparition, haunt, phantom, poltergeist, and specter.

Giant: Giants, often depicted as human-like creatures, are known for their enormous size, incredible strength, and distinctive appearance. This term originated from the Gigantes in Greek mythology and was first recorded in 1297 by Robert of Gloucester.

Jinn: Jinn, also known as djinn or genies, are invisible beings found in early religions of pre-Islamic Arabia and later in Islamic culture. They are similar to humans and can be believers or unbelievers, depending on their acceptance of God's guidance. Jinn are not exclusive to Islam and can incorporate beliefs from other religions. They are neither inherently good nor evil and, like humans, are subject to God's judgment and afterlife. However, Islam rejects worshiping or seeking protection from jinn, aligning with its concept of strict monotheism.

Leprechaun: A leprechaun is a small fairy in Irish folklore, often portrayed as mischievous little men with beards, wearing coats and hats. They are sometimes associated with shoemaking and are believed to possess a hidden pot of gold at the end of the rainbow.

Mermaid: A mermaid is a mythical creature found in folklore globally. It has the upper body of a human female and the tail of a fish. Mermaids are present in the traditions of various cultures around the world, such as Europe, Asia, and Africa.

Minotaur: The Minotaur is a mythological creature with the head and tail of a bull and the body of a man. It lived in the Labyrinth, a complex maze created by Daedalus and Icarus, under the orders of King Minos of Crete. The creature was slain by the hero Theseus.

Pegasus: Pegasus is a winged horse in Greek mythology. He is a white stallion, born from Poseidon and Medusa. Pegasus is the brother of Chrysaor, and both were born when Perseus decapitated their mother. According to Greco-Roman poets, Pegasus ascended to heaven after his birth and followed Zeus' commands to bring lightning and thunder from Olympus.

Phoenix (mythology): The phoenix is an immortal bird found in Greek, Egyptian, and Persian mythology. It is associated with the sun and is known for its cyclic regeneration. The bird obtains new life by rising from the ashes of its predecessor. It is classified as motif B32 in the Motif-Index of Folk-Literature, a tool used by folklorists.

Siren (mythology): Sirens are enchanting beings in Greek mythology with captivating voices. They are depicted in the Odyssey where Odysseus saves his crew from their deadly allure. Roman poets placed them on small islands called Sirenum scopuli. These islands include Anthemoessa, located on Cape Pelorum, and the Sirenuse near Paestum, among others. All of these locations are characterized by cliffs and rocks.

Sphinx: The Sphinx is a legendary being with a human head, lion body, and eagle wings.

Unicorn: The unicorn is a mythical creature with a single large spiral horn on its forehead, mentioned in ancient texts.

Vampire: A vampire is a mythical creature that survives by feeding on the life force of the living. They originated in European folklore as undead beings who caused trouble and death in their communities. Early descriptions portrayed them as swollen and dark, contrasting with today's pale and skeletal depiction. Vampires exist in various cultures, with the term becoming popular in Western Europe during an 18th-century hysteria. In Southeastern Europe, they were referred to by different names, such as shtriga, vrykolakas, and strigoi.

Werewolf: A werewolf is a folklore creature capable of transforming into a wolf, whether by choice, curse, or affliction. These metamorphoses usually happen during the full moon. The belief in this ability, known as lycanthropy, can be traced back to early sources such as Petronius and Gervase of Tilbury.

Zombie: A zombie is an undead creature that is created by reanimating a dead body. It originated from Haitian folklore and is commonly associated with horror and fantasy genres. While traditional zombies are revived through magical practices, modern depictions in popular culture often involve scientific methods like viruses, fungi, and radiation.

Atlantis: Summary: Atlantis is a fictional island in Plato's works, representing a naval empire that ruled the Western world. It serves as an allegory on the pride of nations, contrasting the Achaemenid Empire. After a failed conquest of Ancient Athens, Atlantis is punished by the gods and sinks into the Atlantic Ocean. Plato's account highlights his ideal state, showcasing the superiority of his concept of a state.

El Dorado: El Dorado refers to a legendary city or empire in the Americas associated with vast amounts of gold. Originally, it described a mythical tribal chief or king of the Muisca people in Colombia, who covered himself in gold dust and submerged in Lake Guatavita as an initiation rite.

Paradise: Paradise is a blissful and happy place described in various religions. It is associated with peace, prosperity, and happiness, contrasting with the miseries of human civilization or infernal realms like Hell. Often depicted as a higher, holiest place, it represents contentment, luxury, and everlasting bliss.

Utopia: Utopia refers to an idealized community or society imagined to have highly desirable qualities. Coined by Sir Thomas More for his 1516 book, it portrays a fictional island society in the New World.

Holy Grail: The Holy Grail is a legendary object in Arthurian literature, often described as a powerful cup or stone with healing abilities. It is commonly associated with the Fisher King and hidden in a castle. It symbolizes an elusive and significant goal or object that people seek.

Home: A home is a permanent or semi-permanent residence for humans and sometimes animals. It provides shelter and is used for various activities like sleeping, eating, hygiene, work, and leisure.

Clothing: Clothing refers to items worn on the body, typically made of fabrics or textiles, but historically including garments from animal skin and natural materials. It is primarily worn by human beings and varies based on factors such as gender, body type, social influences, and geographic location. Different clothing items cover specific body parts, including garments for the body, footwear for the feet, gloves for the hands, hats for the head, and underwear for the private parts.

Dress: A dress is a garment traditionally worn by women or girls. It consists of a top piece that covers the torso and a skirt that hangs over the legs. Dresses can be one-piece garments of any length and can be both formal or casual.

Skirt: A skirt is a type of garment that covers the lower part of a dress or can be worn as a separate piece. It extends from the waist downward, providing coverage for the legs.

Nightwear: Nightwear, also known as sleepwear or nightclothes, refers to clothing specifically designed for sleeping. It may vary in style depending on the season, with warmer options for colder conditions and vice versa. Some nightwear can be visually appealing or erotic in addition to providing functionality.

Suit: A suit is a set of clothes consisting of a jacket and trousers made from the same material. It is usually worn with a collared dress shirt, necktie, and dress shoes. A skirt suit is similar, but with a matching skirt instead of trousers. Initially considered casual wear, the suit evolved into semi-formal or business attire. It originated in 19th-century Britain as sportswear, influenced by country clothing. The suit replaced the black frock coat in the early 20th century and became known as a lounge suit.

Swimsuit: A swimsuit is a clothing item worn for water-based activities like swimming and sun-related activities. It comes in different types for men, women, and children. Also known as swimwear, bathing suit, or swimming costume, it can be called by various names depending on the location or type of suit.

Shirt: A shirt is an upper body garment made of cloth.

Trousers: Trousers, also known as slacks and pants, are a clothing item that covers both legs from the waist to the knees or ankles. In the UK, "pants" refers to underwear rather than trousers. Shorts are similar but with legs that end around the knee. In certain contexts, like school uniforms, trousers may be referred to as "long trousers," while tailored shorts are called "short trousers" in the UK.

Uniform: A uniform is a costume worn by members of an organization during their activities. It is commonly used by armed forces, police, emergency services, security guards, workplaces, schools, and prisoners. Some officials like the US Public Health Service and French prefects also wear uniforms. Non-members wearing a uniform may be prohibited, especially in the case of police.

Veil: A veil is a garment or cloth used to cover the head or face or a significant object. It has a long history in European, Asian, and African societies, and is practiced in Judaism, Christianity, and Islam. Veiling is primarily associated with women and sacred objects, but in certain cultures, men also wear veils. It remains relevant in modern secular contexts, like wedding customs.

Boot: A boot is a type of footwear that covers the foot, ankle, and sometimes the lower calf. They can also extend up to the knee or hip. Boots typically have a distinguishable heel and are traditionally made of leather or rubber, although modern boots are made from various materials.

Shoe: A shoe is footwear that protects and comforts the human foot. It adapts to terrains and climate conditions while providing necessary protection. Originally designed for function, shoes have evolved into fashion items. Some shoes, like steel-toe boots, serve as safety equipment at industrial worksites.

Sock: A sock is a type of foot covering that often extends up the ankle or calf. It was originally made from leather or animal hair. Machine-knit socks were introduced in the late 16th century, and by the 19th century, they became more prevalent. Today, both hand-made and machine-knit socks are produced.

Cloak: A cloak is a loose garment worn over clothing, acting as outerwear to protect the wearer from weather conditions. It can also be part of a uniform and has been worn by people in various societies. Cloak designs have evolved over time to adapt to fashion trends and the availability of different textiles.

Coat: A coat is an outer garment worn by both men and women for warmth or style. It typically has long sleeves and closes at the front with buttons, zippers, or other fasteners. Coats may also include features like collars, shoulder straps, and hoods.

Glove: Gloves are hand coverings with separate sheaths for each finger, including the thumb. They provide protection and comfort to hands from cold, heat, friction, abrasion, chemicals, and disease. Gloves also act as a barrier for avoiding direct contact with certain objects or substances.

Hat: A hat is a versatile head covering worn for protection, ceremonies, religious purposes, safety, or as a fashion statement. It can include mechanical features like visors and spikes, and belongs to the broader category of headgear.

Underwear: Underwear, also known as undergarments or underclothing, is clothing worn beneath outer clothes, in direct contact with the skin. Its main functions include protecting outer clothing from soiling, reducing friction against the skin, shaping the body, and providing support and concealment. Some religious undergarments exist, and certain items have dual uses as both underwear and outerwear. Additionally, underwear can serve as nightwear, swimwear, or can be designed for sexual attraction or visual appeal.

Bra: A bra is a form-fitting undergarment primarily used to support and cover a woman's breasts. It typically consists of a chest band, shoulder straps, and breast cups. Bras come in various styles and sizes, including front-fastening and backless designs. They serve specific purposes like nursing bras for breastfeeding and sports bras for minimizing discomfort during exercise.

Diaper: A diaper/nappy is underwear that absorbs waste to prevent soiling. It requires regular changing to prevent skin problems.

Belt (clothing): A belt is a flexible strap worn around the waist made of leather, plastic or heavy cloth. It forms a loop with a buckle and comes in different sizes to adjust to waist measurements.

Button: A button is a fastener used to join fabric pieces by sliding through a buttonhole or loop.

Handbag: A handbag is a large bag with a handle, used to carry personal items. It is also known as a purse in North America, and sometimes called a pocketbook in certain U.S. regions.

Scarf: A scarf is a versatile accessory worn on the neck, shoulders, or head. It provides warmth, sun protection, and can be made from various materials like wool, silk, and cotton. Often used for fashion or to display support for a sports team, scarves are a popular and timeless item of neckwear.

Umbrella: An umbrella is a portable canopy made of wooden or metal ribs attached to a pole, providing protection against rain. It can also be called a parasol, which is used to shield oneself from sunlight. The main distinction lies in the canopy material: umbrellas are waterproof while some parasols are not. Umbrella canopies are typically made of fabric or flexible plastic and there are also hybrid versions known as en-tout-cas.

Wallet: A wallet is a small, flat case or pouch used to carry personal items like cash, debit/credit cards, identification documents, photos, transit passes, and business cards. It is typically made of fabric or leather, pocket-sized, and foldable.

Zipper: A zipper, also known as a zip or zip fastener, is a device used to bind two edges of fabric or flexible materials. It is commonly found in clothing, bags, and camping gear, and comes in various sizes, shapes, and colors. The original design of the zipper was patented in 1892 by Whitcomb L. Judson from Chicago, and it has since evolved into the modern device we know today.

Jewellery: Jewellery is decorative items worn for personal adornment, including brooches, rings, necklaces, earrings, pendants, bracelets, and cufflinks. It can be attached to the body or clothes. Traditionally, jewellery consists of durable ornaments made of metals like gold and gemstones, but other materials like glass, shells, and plant materials can be used.

Hairstyle: A hairstyle is the styling of hair, whether on the head, face, or body. It is part of personal grooming, fashion, and cosmetics, influenced by practical, cultural, and popular factors.

Beard: A beard is the hair that grows on the jaw, chin, lips, cheeks, and neck of humans and certain animals. It typically starts growing in pubescent or adult males around the age of 21.

Moustache: A moustache is facial hair grown above the upper lip and under the nose. It is worn in various styles throughout history.

Wig: A wig is a head covering made from human or animal hair, or synthetic materials. It can be worn to conceal baldness, change appearance, or as part of professional uniforms. The term comes from "periwig."

Cosmetics: Cosmetics are mixtures of chemical compounds that can be derived from natural or synthetic sources. They serve various purposes including personal care, skin care, and enhancing one's appearance through makeup. They can cleanse, protect, conceal blemishes, enhance features, add color, and even change the appearance to resemble something else. Additionally, cosmetics can also be used to add fragrance to the body.

Perfume: Perfume is a liquid mixture of fragrant oils, chemicals, and solvents used to give a pleasant scent to the human body, animals, objects, and spaces. It is composed of essential oils and manmade aromatic chemicals. Perfumes have historically played a significant role in the advancement of organic chemistry.

Mask: Masks, worn on the face or elsewhere on the body, have been used for centuries for protection, disguise, rituals, and entertainment. They serve both practical and ceremonial purposes, and are commonly utilized in performing arts.

Nudity: Nudity refers to the state of being without clothing. Humans were naked for the majority of pre-history, until body adornments became prevalent. Indigenous peoples in warm climates used clothing for decoration and ceremony but often remained nude due to a lack of shame or need for protection. In some societies, children were naked until puberty, and women did not cover their breasts due to their association with nursing rather than sexuality.

Eating: Eating is the act of consuming food to obtain energy and nutrients for growth in heterotrophic organisms. Various species have different dietary requirements: carnivores eat other animals, herbivores consume plants, omnivores have a mixture of plant and animal matter, while detritivores feed on detritus. Unlike animals, fungi digest organic matter externally.

Food: Food is a substance consumed by organisms to support nutrition. It can be of plant, animal, or fungal origin and provides essential nutrients like carbohydrates, fats, proteins, vitamins, and minerals. Organisms ingest and assimilate food to obtain energy, maintain life, and promote growth. Various species have different feeding behaviors that are adapted to their metabolic needs and specific ecological niches in specific geographical contexts.

Drink: A drink is a liquid for humans that quenches thirst and has cultural significance. Common types include water, milk, juice, smoothies, soft drinks, coffee, tea, and hot chocolate. Caffeinated drinks with caffeine are also popular throughout history.

Drinking: Drinking is the intake of liquids by swallowing, which occurs through the mouth or other openings in the body. Peristalsis in the esophagus assists in the process. Drinking methods can differ significantly among various animal species.

Meal: A meal is a specific eating occasion at a particular time, which involves consuming food. The names for meals in English can vary based on culture, time of day, or meal size.

Breakfast: Breakfast is the morning meal that breaks the fasting period of the previous night. It varies by region and tradition and consists of a variety of food choices.

Lunch: Lunch is a midday meal that typically follows breakfast and varies in size across different cultures and regions.

Dinner: Dinner is the largest and most formal meal in many Western cultures. It used to be eaten around midday but gradually shifted to later times. The word has different meanings across cultures and can refer to a meal of any size at any time. It is sometimes used for a midday or early afternoon meal on special occasions. In hot climates, dinner is typically consumed in the evening.

Dessert: Dessert is a sweet course served at the end of a meal, typically consisting of cake and possibly a beverage like dessert wine. It may also involve sweetening typically savory foods. However, not all cultures have a tradition of serving dessert to conclude a meal.

Dieting: Dieting is the regulated practice of consuming food to control body weight and address health conditions. Different calorie-reduced diets are equally effective for weight loss, but long-term adherence is key for success. Individual outcomes of dieting can vary significantly.

Snack: A snack is a small portion of food consumed between meals, typically not exceeding 200 calories. They can be packaged or homemade, made from fresh ingredients or processed foods.

Vegetable: Vegetables encompass various plant parts consumed as food by humans and animals. This term includes all edible plant matter like flowers, fruits, stems, leaves, roots, and seeds. However, its definition may vary based on culinary and cultural traditions. Certain foods like fruits, flowers, nuts, and cereals might be excluded, while savory fruits like tomatoes and courgettes, flowers like broccoli, and seeds like pulses could be included.

Vegetarianism: Vegetarianism is a dietary choice where individuals avoid eating meat and by-products of animal slaughter.

Veganism: Veganism is a lifestyle that avoids animal products, including in diet, and opposes treating animals as commodities. Vegans are individuals who follow this diet and philosophy.

Cuisine: Cuisine refers to a cooking style tied to a specific culture or region. It incorporates distinct ingredients, techniques, and dishes. Regional customs, ingredients, and preparation methods contribute to the creation of unique dishes.

Fast food: Fast food is commercial, mass-produced food that prioritizes quick service. It is sold in restaurants or stores and typically contains preheated or precooked ingredients served in take-out packaging. The concept originated as a strategy to cater to busy commuters, travelers, and wage workers. The global fast food industry was valued at approximately $570 billion in 2018.

Chinese cuisine: Chinese cuisine originated in China and has spread to other parts of the world through the Chinese diaspora. It has greatly influenced other Asian cuisines and beyond, with adaptations to suit different tastes. Popular Chinese food staples like rice, soy sauce, noodles, tea, chili oil, and tofu are now widely available globally. The use of utensils such as chopsticks and the wok is also widespread.

French cuisine: French cuisine is a culinary tradition originating from France. It can be traced back to the 14th century with the emergence of early recipe collections such as Le Viandier. Throughout history, influential chefs like Taillevent, François Pierre La Varenne, and Marie-Antoine Carême played significant roles in establishing a distinct and indigenous style of cooking in France by minimizing foreign influences.

Indian cuisine: Indian cuisine, originating from the Indian subcontinent, encompasses regional and traditional cooking styles. With vast diversity in soil, climate, culture, ethnic groups, and occupations, it offers a wide array of dishes. The cuisine utilizes locally sourced spices, herbs, vegetables, and fruits, resulting in significant variations between different regions.

Japanese cuisine: Japanese cuisine is a diverse and intricate culinary tradition that reflects centuries of cultural influences. It centers around rice and miso soup, while seasonality is highly valued. The cuisine showcases an array of seafood, often grilled or served raw in sushi and sashimi. Side dishes commonly include pickled vegetables, deep-fried tempura, and noodles like soba and udon. Simmered dishes like oden and sukiyaki are also popular. This cuisine encompasses a rich variety of flavors and cooking techniques.

Italian cuisine: Italian cuisine is a Mediterranean cooking style developed in Italy since ancient Roman times. It involves a range of ingredients, recipes, and cooking techniques that have spread globally due to Italian diaspora. The cuisine has been influenced by other cultures and underwent major changes with the discovery of the Americas, introducing new ingredients like potatoes, tomatoes, maize, capsicums, and sugar beet. Italian cuisine is highly recognized and widely cherished worldwide.

Mexican cuisine: Mexican cuisine, with its roots in Mesoamerican cooking, encompasses the culinary traditions of modern-day Mexico. It originated from ancient civilizations like the Olmec and Maya, who introduced ingredients like maize and nixtamalization. Over time, various Mesoamerican groups such as the Teotihuacanos, Toltec, and Zapotec contributed their unique cooking methods. With the rise of the Mexica Triple Alliance, Mexican cuisine became diverse and rich in flavor.

Middle Eastern cuisine: Middle Eastern cuisine is a diverse collection of cuisines originating from the Middle East and West Asia. It is characterized by the use of ingredients like olives, olive oil, pitas, honey, sesame seeds, dates, sumac, chickpeas, mint, rice, and parsley. Popular dishes in Middle Eastern cuisine include kebabs, dolmas, falafel, baklava, yogurt, doner kebab, shawarma, and mulukhiyah.

Bar (establishment): A bar is a retail establishment that serves alcoholic beverages and sometimes food. It is also known as a saloon, tavern, pub, or club. These establishments typically offer a variety of drinks, including beer, wine, liquor, and cocktails. Bars may also sell snacks for consumption on the premises. The term "bar" refers to the countertop where drinks are prepared and served.

Restaurant: A restaurant is a food business that serves meals and drinks to customers, offering dine-in, take-out, and delivery services. Restaurants differ in appearance, cuisine, and service models, ranging from fast-food to family to high-end luxury establishments.

Food preservation: Food preservation is the practice of making food more resistant to microorganism growth and slowing down fat oxidation. It includes methods to inhibit decomposition, rancidification, and visual deterioration. Preservation reduces food waste, decreases production costs, improves efficiency, enhances food security and nutrition, and contributes to environmental sustainability by reducing the environmental impact of food production.

Pickling: Pickling is a preservation technique that involves fermenting or soaking food in vinegar to extend its shelf life. This process alters the texture and flavor of the food, resulting in a pickle. Various foods can be pickled, including vegetables, fruits, mushrooms, meats, fish, dairy, and eggs.

Smoking (cooking): Smoking is a cooking method that uses smoke from burning or smoldering wood to add flavor and preserve food. It is commonly used for meat, fish, and lapsang souchong tea.

Brewing: Brewing is the process of making beer by soaking a starch source in water and fermenting the resulting liquid with yeast. It can be done commercially, at home, or communally. This practice dates back to ancient civilizations like Egypt, China, and Mesopotamia. The brewing industry has been an important part of Western economies since the nineteenth century.

Canning: Canning is a food preservation method that seals and processes food in airtight containers, providing a shelf life of 1-5+ years. Certain freeze-dried canned products can even last up to 30 years while remaining edible.

Cooking: Cooking is the art, science, and craft of using heat to make food tastier, easier to digest, more nutritious, and safe. It encompasses a wide range of techniques and ingredients, from grilling over fire to baking in ovens, adapting to local conditions.

Baking: Baking is a cooking method that uses dry heat, typically in an oven, to transform batters and doughs into delicious baked goods with a firm, crusty exterior and a moist, soft center. It can be done with bread, cookies, cakes, and other foods. Baking can also be combined with grilling to create a barbecue variant. This cooking technique is related to barbecuing due to the similar concept of using an enclosed cooking space.

Frying: Frying is a cooking method that involves using oil or fat to cook various types of food. It is similar to sautéing, but pan-fried dishes are usually flipped over during cooking for even results. A wide range of foods can be fried.

Grilling: Grilling is a quick cooking method that applies heat directly to food surfaces, often using a grill or pan. It uses direct, radiant heat to cook meat and vegetables efficiently.

Steaming: Steaming is a cooking method that uses steam to cook food. It can be done using a food steamer or a wok. Steam pits have been found in the American southwest dating back 5,000 years. Steaming is considered a healthy cooking technique suitable for a wide range of foods.

Cooking oil: Cooking oil is a fat derived from plants or animals, used for frying and baking. It allows for higher cooking temperatures, distributing heat evenly and reducing burning. It adds flavor and is also used in non-heated food preparations like dressings and dips.

Vegetable oil: Vegetable oil refers to oils derived from seeds or other parts of fruits. These oils contain mixtures of triglycerides, similar to animal fats. Examples include soybean oil, grape seed oil, and cocoa butter from seeds, as well as olive oil, palm oil, and rice bran oil from other fruit parts. In everyday language, vegetable oil typically denotes liquid vegetable fats at room temperature, and they are commonly consumed.

Bread: Bread is a widely consumed food made by baking a dough of flour and water. It has a significant history, being one of the oldest human-made foods and a vital part of various cultures' diets worldwide. Additionally, bread holds a crucial role in religious practices and secular traditions.

Flatbread: Flatbread is a type of bread made by rolling flattened dough composed of flour, liquid (such as water, milk, or yogurt), and salt. These breads can either be unleavened or leavened, like pita bread.

Cereal: Cereal refers to grasses grown for their edible grains, which consist of an endosperm, germ, and bran. Cereal grains like rice, wheat, oats, barley, rye, millet, and maize are staple crops worldwide, providing significant food energy. Pseudocereals like buckwheat, quinoa, and chia, from different plant families, also yield edible grains.

Flour: Flour is a versatile powder made by grinding grains, roots, beans, nuts, or seeds. It is used in various foods worldwide. Wheat flour is essential for making bread, while corn flour is significant in Mesoamerican cuisine. Rye flour is a common ingredient in bread in both Central and Northern Europe.

Eggs as food: Eggs as food have been consumed by humans and their ancestors for millions of years. Chicken eggs are the most widely consumed, with Southeast Asians starting to eat them by 1500 BCE. Eggs from other birds are less common, and reptile, amphibian, and fish eggs are also consumed, known as roe or caviar.

Honey: Honey is a sweet and sticky substance produced by bees, primarily honey bees, to nourish their colonies. Bees collect plant secretions or the secretions of other insects, like aphids, and refine them through regurgitation, enzymatic activity, and water evaporation in the hive. The end result is a thick, viscous liquid rich in sugars.

Lard: Lard is a white, semi-solid fat obtained from pigs' fatty tissue, distinct from tallow derived from cattle or sheep fat.

Meat: Meat is animal flesh consumed as food. Throughout history, humans have obtained meat by hunting, farming, and scavenging. The Neolithic Revolution enabled domestication of various animals like chickens, sheep, rabbits, pigs, and cattle, paving the way for large-scale meat production in slaughterhouses.

Beef: Beef, derived from cattle, is a versatile meat that can be prepared in various ways. It is a rich source of protein, iron, and vitamin B12. However, high consumption, particularly of processed beef, is linked to an elevated risk of colorectal cancer and coronary heart disease. Additionally, beef production is environmentally impactful, contributing significantly to deforestation and greenhouse gas emissions.

Veal: Veal is the meat of young calves, usually male dairy breed calves that are not used for breeding. It is more expensive than beef and can be produced from calves of any sex or breed. Veal production is a means to add value to dairy bull calves and make use of whey solids, a byproduct from cheese manufacturing.

Lamb and mutton: Lamb and mutton refer to the meat of domestic sheep. Lamb meat comes from sheep in their first year, while hogget is the term for meat from sheep in their second year. Mutton refers to meat from older sheep. Outside select countries, terms like "hogget" and "sheep meat" are not commonly used by consumers. Hogget is gaining popularity in England, especially in the North, often connected to rare breed and organic farming practices.

Pork: Pork is the meat from pigs, widely consumed globally. Its origins trace back to 5000 BCE, showcasing the long history of pig husbandry.

Bacon: Bacon is salt-cured pork derived from the belly or less fatty parts of the back. It is enjoyed as a side dish, used in recipes as a primary ingredient or flavor enhancer.

Ham: Ham is preserved pork from the leg that can be wet or dry cured, with or without smoking. It encompasses whole cuts and mechanically formed meat.

Poultry: Poultry refers to domesticated birds raised by humans for meat, eggs, or feathers. Poultry farming is the practice of raising these birds, primarily those belonging to the Galloanserae superorder, especially the order Galliformes. It also includes waterfowls from the Anatidae family and other flying birds, such as young pigeons, reared and slaughtered for their meat. However, wild birds hunted for food, known as game or quarry, are not considered poultry.

Chicken as food: Chicken is a popular poultry worldwide due to its easy and affordable farming. As a result, chicken meat and eggs are widely used in various cuisines.

Sausage: A sausage is a meat product made from ground meat, usually pork, beef, or poultry, mixed with salt, spices, and other flavorings. It may also contain fillers or extenders like grains or breadcrumbs.

Offal: Offal, known as variety meats or organ meats, refers to the internal organs of animals after slaughter. The specific organs considered offal may differ across cultures, excluding skeletal muscle. Additionally, offal can also include by-products of processed grains like corn or wheat.

Seafood: Seafood refers to edible sea life such as fish and shellfish. This includes molluscs, crustaceans, and echinoderms. In the past, marine mammals like cetaceans and seals were also consumed, but this is less common today. Sea vegetables like seaweed are widely consumed in Asia.

Fish as food: Fish are widely caught and eaten by people globally. They have long been an important source of protein and nutrients in human diets.

Milk: Milk is a white liquid food from mammals' mammary glands, providing vital nutrition for young mammals until they can eat solids. It enhances immunity with antibodies in early lactation milk known as colostrum, reducing disease risks. Milk is nutrient-rich with protein and lactose.

Butter: Butter is a dairy product made from churning cream and contains around 80% butterfat. It is a semi-solid emulsion and is commonly used as a spread or melted as a condiment. Additionally, it serves various culinary purposes such as baking, sauce-making, and pan frying.

Cream: Cream is a dairy product made by skimming the fatty layer from milk before it is homogenized. This separation process is achieved using machines called separators. Cream comes in different grades based on its butterfat content and can be turned into a powder for easy transport. It has a high concentration of saturated fat.

Cheese: Cheese is a versatile dairy product made by curdling milk protein using enzymes like rennet. It comes in various flavors, textures, and forms. The curds are separated from the liquid whey, pressed, and often develop aromatic molds.

Ice cream: Ice cream is a frozen dessert made from milk or cream, sugar or an alternative sweetener, and flavored with spices or fruits. It may also contain food coloring and stabilizers to prevent ice crystal formation. Air is incorporated during the freezing process to create a smooth texture. Alternatively, it can be made by whisking a flavored cream base with liquid nitrogen. The resulting semi-solid foam is malleable at low temperatures and becomes more flexible as it warms up.

Yogurt: Yogurt is a fermented food made from milk using yogurt cultures. It has a creamy texture and a tangy taste due to lactic acid produced during fermentation. Cow's milk is commonly used, but yogurt can also be made from milk of other animals like goats or camels. The type of milk used and its processing methods influence the final product.

Margarine: Margarine is a widely used spread in cooking and baking, commonly used as a butter substitute. While it was originally made from animal fats, today's margarine is mainly derived from vegetable oil. The name "margarine" comes from combining Latin and Greek words, and it was initially called "oleomargarine."

Soy milk: Soy milk, also called soya milk, is a plant-based drink made by soaking and grinding soybeans, then boiling and filtering the mixture. It is an emulsion of oil, water, and protein, originally an intermediate product for making tofu. Originating in China, it gained popularity in Europe and North America with improved taste and consistency. Soy milk serves as a substitute for dairy milk for vegans and those with lactose intolerance.

Tofu: Tofu, also known as bean curd, is a versatile food made by coagulating soy milk and pressing into solid white blocks. It has varying levels of softness and is commonly used as a meat substitute in Western cooking. Originating from China, tofu has been a traditional ingredient in Asian cuisines for over 2,000 years.

Condiment: A condiment is a flavoring added to food after cooking to enhance or complement the dish. It can be served separately, allowing the diner to add it according to their taste.

Herb: Herbs are plants used for flavoring, garnishing, medicinal purposes, or fragrance. They are distinct from vegetables and spices, as they mainly refer to the leafy or flowering parts of a plant. Spices, on the other hand, are dried and obtained from various plant parts like seeds, bark, roots, and fruits.

Sauce: A sauce is a liquid or semi-solid food used to enhance the flavor and appearance of other dishes. It is commonly added to meals for moisture and taste. The term "sauce" comes from the Latin word salsa, meaning salted. Garum, a fish sauce, is one of the earliest European sauces, while doubanjiang, a Chinese soybean paste, was mentioned in ancient texts.

Spice: Spices are plant substances used for flavoring or coloring food, distinct from herbs. They can also be used in medicine, religious rituals, cosmetics, or perfume production. Plant-based sweeteners like sugar are not classified as spices.

Chutney: Chutney is a versatile spread commonly found in Indian cuisine. It comes in various forms including tomato relish, peanut garnish, yogurt, cucumber, coconut, onion, or mint dipping sauce.

Fruit preserves: Fruit preserves are sweetened fruit preparations preserved primarily with sugar and sometimes acid. Typically stored in glass jars, they serve as condiments or spreads.

Ketchup: Ketchup is a sweet and sour table condiment. It is commonly associated with tomato ketchup, but historically, it contained various ingredients like mushrooms, oysters, and walnuts.

Mayonnaise: Mayonnaise, or "mayo", is a cold, creamy sauce used on sandwiches, burgers, salads, and fries. It serves as a base for sauces like tartar, fry sauce, remoulade, salsa golf, ranch dressing, and rouille.

Mustard (condiment): Mustard is a popular condiment derived from mustard plant seeds.

Salt: Salt is a mineral primarily made of sodium chloride. It is also known as table salt or rock salt. Salt is vital for life and contributes to the basic taste of saltiness. It has been used for thousands of years to enhance the taste of food and preserve it through salting, brining, and pickling.

Soy sauce: Soy sauce is a Chinese condiment with a fermented paste made from soybeans, roasted grain, brine, and molds like Aspergillus oryzae or Aspergillus sojae. It is known for its strong umami flavor.

Sugar: Sugar refers to sweet-tasting, soluble carbohydrates used in food. It includes simple sugars like glucose, fructose, and galactose, as well as compound sugars like sucrose, lactose, and maltose. White sugar is a refined form of sucrose. Compound sugars are broken down into simple sugars in the body.

Vinegar: Vinegar is a solution of acetic acid and other compounds, usually containing 5-8% acetic acid. It is made by fermenting simple sugars into ethanol with yeast, and then converting ethanol to acetic acid with bacteria. Different types of vinegar are produced using different source materials. Vinegar is commonly used in cooking and pickling, and as a condiment or garnish. Examples include balsamic vinegar and malt vinegar.

Biscuit: A biscuit is a commonly consumed baked food made from flour, typically sweet and sometimes savory. It is usually hard, flat, and unleavened, and can be flavored with sugar, chocolate, jam, ginger, or cinnamon. Some popular types include sandwich biscuits, digestives, shortbread, chocolate chip cookies, Anzac biscuits, and speculaas.

Breakfast cereal: Breakfast cereal is a processed grain food commonly consumed as part of breakfast or as a snack, particularly in Western societies.

Cake: Cake is a baked flour confection made with sugar and other ingredients. Originally derived from bread, cakes have evolved into a diverse range of preparations resembling desserts like pastries, meringues, custards, and pies.

Candy: Candy, also known as sweets or lollies, is a type of confection made primarily from sugar. It falls under the category of sugar confectionery and includes various treats like chocolate, chewing gum, and sugar candy. The term "candied" refers to vegetables, fruits, or nuts that have been coated in sugar.

Casserole: A casserole is a deep pan used for cooking and serving a variety of dishes in the oven. It can also refer to the meals cooked in this vessel, while the pan itself may be called a "casserole dish" or "casserole pan".

Chocolate: Chocolate is a versatile food made from roasted cacao seeds, found in liquid, solid, or paste form. It has been enjoyed since ancient times, with Mesoamerican civilizations consuming chocolate beverages. Introduced to Europe in the 16th century.

Curry: Curry is a popular South Asian dish, known for its sauce seasoned with flavorful spices. It is often made with leaves from the curry tree in southern India.

Dumpling: A dumpling is a dish made of cooked dough, wrapped around a filling consisting of various ingredients such as meat, fish, tofu, vegetables, or cheese. It can be prepared using different types of dough, like bread, wheat, potato-based, and cooked using various methods. Dumplings are a popular feature in cuisines worldwide.

Noodle: Noodles are a popular food made from dough that is flattened, cut, stretched, or extruded into long strips. They are a staple in many cultures and come in various shapes.

Pasta: Pasta is a staple food of Italian cuisine, made from a dough of wheat flour or other alternatives like rice flour or legumes, shaped into sheets or other forms, and then boiled or baked.

Pastry: Pastry is a type of baked food made from a dough of flour, water, and shortening. It can be either savory or sweetened. Sweetened pastries are known as bakers' confectionery. Pastries encompass a variety of baked products made from ingredients like flour, sugar, milk, butter, shortening, baking powder, and eggs. Examples of pastry dishes include pies, tarts, quiches, croissants, and pasties.

Pie: A pie is a baked dish with a pastry dough casing and a filling of sweet or savory ingredients. Sweet pies can have fruit, nuts, preserves, or sweetened vegetables. Savory pies can have meat, eggs, cheese, or a mixture of meat and vegetables.

Pizza: Pizza is an Italian dish made of round, flat dough topped with tomatoes, cheese, and other ingredients. It is baked at a high temperature, often in a wood-fired oven.

Porridge: Porridge is a versatile food made by boiling grains in milk or water. It can be sweetened with sugar, honey, or fruit, or made savory by adding spices, meat, or vegetables. Oat porridge is a popular type, and gruel is a thinner version. Congee is a savory Asian variation.

Sushi: Sushi is a traditional Japanese dish consisting of seasoned rice combined with various ingredients like seafood and vegetables. The key component is the "sushi rice" or shari, which is prepared with vinegar, sugar, and salt. Sushi comes in different styles, with raw or cooked seafood being the most common choice. Its presentation and ingredients can vary greatly.

Salad: A salad is a dish made of mixed ingredients, usually vegetables, served cold or at room temperature. It can also be served warm. Salad dressings and condiments are commonly used to enhance the flavors.

Sandwich: A sandwich is a food that involves bread with various fillings like meat, cheese, or vegetables. It started as a portable finger food in the Western world but has now gained global popularity.

Hamburger: A hamburger, also known as a burger, is a sandwich made with a ground beef patty placed inside a sliced bun. It can be served with various toppings like cheese, lettuce, tomato, onion, pickles, bacon, or chilis, along with condiments like ketchup, mustard, mayonnaise, or relish. It is often served on sesame seed buns. When a patty is topped with cheese, it is called a cheeseburger.

Soup: Soup is a liquid food served warm, made by combining meat or vegetables with stock, milk, or water. It involves boiling ingredients to extract flavors, forming a broth. Soups are similar to stews but generally have more liquid.

Stew: A stew is a dish made by cooking solid food ingredients in liquid, resulting in a gravy-like consistency. It typically includes a combination of vegetables and meat, including tougher cuts suitable for slow-cooking. Stock or water is used as cooking liquid, with the addition of red wine or other alcohol for flavor. Seasonings and flavorings are added, and stews are cooked at a low temperature to allow flavors to blend together.

Drinking water: Drinking water, or potable water, is safe for ingestion either in liquid form or indirectly through food preparation. It is often provided through taps as tap water, which generally meets quality standards in developed countries. Additionally, tap water is commonly used for washing, toilets, and irrigation. Greywater may also be used for toilets or irrigation, but there are associated risks.

Juice: Juice is a liquid extracted from fruits and vegetables, or it can be flavored with concentrates. It is commonly consumed as a beverage or used as an ingredient in food and beverages. The development of pasteurization methods allowed for its preservation. New Zealand and Colombia are the biggest fruit juice consumers, and consumption generally increases with income level.

Soft drink: Soft drinks are water-based flavored drinks. They can be carbonated or not, and contain added sweeteners. Flavors can be natural or artificial. Common sweeteners include sugar, high-fructose corn syrup, fruit juice, or substitutes. Soft drinks may also include caffeine, colorings, preservatives, and other ingredients.

Coca-Cola: Coca-Cola, also known as Coke, is a popular carbonated soft drink made by the Coca-Cola Company. It is consumed worldwide, with over 1.8 billion servings consumed daily in 2013. Coca-Cola is ranked as the 87th largest US corporation by revenue and is recognized as the sixth most valuable brand globally according to Interbrand's 2020 study.

Coffee: Coffee is a popular drink made from roasted beans known for its bitter taste, dark color, and slight acidity. Its caffeine content provides a stimulating effect on humans, making it highly consumed worldwide, particularly in hot drink markets.

Hot chocolate: Hot chocolate, also called hot cocoa or drinking chocolate, is a warm beverage made by melting chocolate or cocoa powder in milk or water, along with a sweetener. It is commonly served with whipped cream or marshmallows and can be thick and less sweet if prepared with melted chocolate.

Tea: Tea is an aromatic beverage made from the leaves of the Camellia sinensis plant. It is widely consumed worldwide after water. Different types of tea have varying flavors, ranging from cooling and bitter to sweet, nutty, floral, or grassy. Tea is known for its stimulating effect, largely due to its caffeine content.

Alcoholic beverage: An alcoholic beverage is a drink with ethanol, produced through fermenting grains, fruits, or sugar sources. It is consumed for social reasons in various cultures. These beverages are categorized as beers, wines, or spirits and have alcohol content ranging from 3% to 50%.

Beer: Beer is a popular alcoholic beverage, brewed from cereal grains like malted barley, wheat, corn, rice, or oats. Its fermentation produces ethanol and carbonation. Hops are commonly added for bitterness, flavor, and preservation, while other ingredients like herbs or fruits may be used instead. Commercially, natural carbonation is often substituted with forced carbonation.

Wine: Wine is an alcoholic drink produced by fermenting fruit sugars with yeast, resulting in ethanol and carbon dioxide. While it can be made from various fruits, grape wine is the most common term used.

Cider: Cider is an alcoholic beverage made from fermented apple juice, popular in the UK, Ireland, and their former colonies. It is also enjoyed in countries like Portugal, France, Spain, and Germany. In the US and Canada, alcoholic ciders are called hard cider, distinct from non-alcoholic apple cider. Cider typically has a higher alcohol content in the South West of England. In Canada, cider should contain between 2.5% and 13% alcohol by volume.

Cocktail: A cocktail is an alcoholic mixed drink made by combining spirits with various ingredients like juices, flavored syrups, tonic water, shrubs, and bitters. Cocktails differ greatly across the globe and numerous websites offer original recipes and variations of well-known cocktails.

Liquor: Liquor is a distilled alcoholic drink made from fermented grains, fruits, vegetables, or sugar. It contains higher alcohol content than other beverages, earning it the label "hard liquor." Often referred to as spirits, liquors like vodka, rum, gin, and tequila go through a distillation process to increase their alcohol content. Aging in barrels produces brandy and whiskey, while flavorings are added to create flavored liquors such as absinthe.

Brandy: Brandy is a liquor made by distilling wine and typically contains 35-60% alcohol. It is enjoyed as a digestif after dinner. Some brandies are aged in wooden casks, while others are colored to imitate aging. Cognac and Armagnac from France are highly esteemed examples of wine brandy.

Gin: Gin is an alcoholic drink made by distilling juniper berries and other botanical ingredients, resulting in various flavors and aromas.

Liqueur: Liqueur is a sweet alcoholic drink made by combining spirits with sugar, fruits, herbs, and spices. It is often enjoyed after desserts and aged briefly to allow the flavors to mix.

Rum: Rum is a liquor made from fermenting and distilling sugarcane molasses or juice. It is often aged in oak barrels. Originally from Barbados, rum is now produced in many sugar-producing regions worldwide, including the Philippines, where the largest rum producer, Tanduay Distillers, is based.

Sake: Sake, also known as Japanese rice wine, is an alcoholic drink made by fermenting polished rice. Unlike wine, sake follows a brewing process similar to beer, converting starch into sugars that ferment into alcohol. This traditional beverage has its origins in Japan and is considered a significant part of their culture.

Tequila: Tequila is a distilled alcohol derived from blue agave, produced mainly near the city of Tequila in Mexico. It is made in the Jaliscan Highlands of Jalisco state.

Vodka: Vodka is a clear alcoholic drink originating from Poland, Russia, and Sweden. It is made by distilling fermented cereal grains and potatoes since the 1700s, but modern brands also use corn, fruits, and other bases. It mainly consists of water, ethanol, and sometimes flavorings with traces of impurities.

Whisky: Whisky is a liquor made from fermented grain mash, aged in wooden casks, typically made of charred white oak. Different grains like barley, corn, rye, and wheat are used to create various varieties. Occasionally, uncharred white oak casks from port, rum, or sherry aging are employed.

Family: The term 'Family' refers to a group of people connected through blood or marriage. It serves as the foundation for social stability and promotes the welfare of its members and society. Families ideally provide stability, organization, and security for individuals as they grow and integrate into the community. Throughout history, families have been crucial for fostering attachment, care, and socialization in most human societies.

Household: A household is a group of individuals living together in the same dwelling. It is the fundamental unit of analysis in social, economic, and government models, playing a crucial role in economics and inheritance.

Nuclear family: A nuclear family is a family group consisting of parents and their children living in one home. It is distinct from single-parent, extended, or polygamous families. Typically, a nuclear family revolves around a married couple with varying numbers of children. Definitions may differ, including or excluding step- or adopted children. Some scholars argue that extended families are more prevalent across cultures and history than nuclear families.

Extended family: An extended family expands beyond the nuclear family to include relatives such as aunts, uncles, grandparents, and cousins. They either live nearby or in the same household and can take the form of stem or joint families.

Stepfamily: A stepfamily is formed when one parent has children from a previous relationship or marriage who are not biologically related to their spouse. There are two types of stepfamilies: simple, where only one parent has a prior child and the couple has no children together, and complex or blended, where both parents have children from previous relationships.

Kinship: Kinship refers to the social connections and relationships that are essential in human societies. It encompasses various aspects such as mating, parenthood, siblingship, and socialization. Anthropologist Robin Fox suggests that studying kinship involves understanding how humans utilize these fundamental aspects of life to serve social purposes. These purposes include the upbringing of children and the establishment of economic, political, and religious groups.

Affinity (law): Affinity refers to the kinship relationship established between two individuals due to marriage. It encompasses the connections each spouse has with the other's relatives, excluding the marital bond itself. Laws and practices regarding affinity vary, often ending with the death or divorce of the marriage partners. Affinity may extend to include relationships formed through adoption or stepfamilies.

Clan: A clan is a united group of individuals connected by actual or perceived kinship. They often trace their origins back to a common ancestor, symbolizing their unity. In indigenous societies, clans did not practice endogamy, meaning members were prohibited from marrying within the same clan.

Consanguinity: Consanguinity refers to the kinship between individuals who share a common ancestor. It describes the characteristic of being related to a relative through descent.

Lineage (anthropology): A lineage in anthropology is a group that proves their common ancestry from a specific ancestor. It can be traced through mothers (matrilineal) or fathers (patrilineal), depending on the culture.

Interpersonal relationship: An interpersonal relationship is a social association between two or more people. It involves various degrees of intimacy, self-disclosure, reciprocity, and power distribution. Interpersonal relationships encompass family, kinship, friendship, love, marriage, business, employment, clubs, neighborhoods, ethical values, support, and solidarity. They are regulated by law, custom, or mutual agreement and are integral to social groups and societies. These relationships are formed through communication and actions within specific social contexts, relying on equitable and reciprocal compromises.

Friendship: Friendship is a bond of mutual affection between people that surpasses mere acquaintances or associations, like classmates or coworkers, forming a stronger interpersonal relationship.

Cohabitation: Cohabitation refers to the living arrangement of unmarried couples, who are involved in a long-term or permanent romantic or sexual relationship. This practice has become more prevalent in Western countries since the late 20th century due to changing social attitudes towards marriage, gender roles, and religion.

Concubinage: Concubinage is a relationship where a couple cannot or does not want to get married, yet engages in a sexual partnership. Although similar to marriage, the two are seen as separate and distinct.

Intimate relationship: An intimate relationship refers to an emotionally and physically close connection between individuals, which can involve romance, love, and sexual intimacy. These relationships are interdependent, with mutual influence between partners. The nature and quality of the relationship depend on unique interactions and the context developed over time. While marriage and other institutions recognize and support intimate relationships, they are not always monogamous or sexual, and norms and practices of intimacy vary across societies.

Infidelity: Infidelity refers to a breach of emotional and/or sexual commitment in a relationship, often leading to feelings of anger, sexual jealousy, and rivalry between partners.

Breakup: A breakup refers to the end of a relationship, often called "dumping" when initiated by one partner. It is not usually used for married couples, who have separations or divorces. When an engaged couple ends their relationship, it is referred to as a "broken engagement." Breakups can occur in non-romantic or platonic relationships due to the failure to maintain a friendship.

Same-sex relationship: A same-sex relationship is when two people of the same sex have a romantic or sexual connection. Same-sex marriage involves the official recognition of these relationships, while civil unions are an alternative where same-sex marriage is not allowed.

Marriage: Marriage is a recognized union between spouses that establishes rights and obligations. It varies across cultures and religions, acting as a social construct to manage conflicts and fulfill personal needs. It involves interpersonal relationships, often sexual, and can be recommended or compulsory before engaging in sexual activity. The ceremony is called a wedding, while a private marriage is known as an elopement.

Arranged marriage: Arranged marriage is a marital union where family members, usually parents, choose the bride and groom instead of the couple themselves. Sometimes, a matchmaker assists in finding a suitable spouse.

Civil union: A civil union is a legal agreement resembling marriage, designed to provide legal recognition and rights to same-sex couples. It grants some or all of the rights associated with marriage.

Courtship: Courtship is a period of getting to know each other before considering marriage or a committed relationship. It can be private or public, with the aim of encouraging a marriage proposal. It can follow a betrothal and ends with the celebration of marriage.

Dating: Dating is a process where two people interact to assess if they are compatible for a future intimate relationship. It involves social activities done together, alone or with others.

Romance (love): Romance is a profound feeling of love and strong attraction toward someone. It encompasses courtship behaviors used to express these emotions and overall affection.

Wedding: A wedding is a ceremony that unites two people in marriage, incorporating various traditions and customs from different cultures, religions, and social classes. It typically includes exchange of vows, presentation of a gift, and a public proclamation of marriage by an authority figure. Special wedding garments are worn, followed by a reception. The ceremony may include music, poetry, prayers, or readings, and often incorporates superstitious customs.

Divorce: Divorce is the legal termination of a marriage, involving the dissolution of marital responsibilities and bonds under the rule of law. It is a court process that ends a marriage.

Polygamy: Polygamy involves marrying multiple spouses, with polygyny referring to a man having multiple wives and polyandry referring to a woman having multiple husbands simultaneously. In a broader context, polygamy can also encompass any form of multiple mating in sociobiology and zoology.

Monogamy: Monogamy is an exclusive partnership between two individuals, where they have only one partner at a time. It contrasts with non-monogamy and is also used to describe animal mating systems. In human culture, monogamy usually refers to two individuals committing to a sexually exclusive relationship, regardless of their sexual orientation.

Endogamy: Endogamy is the practice of marrying or forming close relationships exclusively within a specific social, religious, or ethnic group, excluding those from outside the group. This cultural norm opposes exogamy, which is the practice of marrying outside the group.

Exogamy: Exogamy is the practice of marrying outside one's social group. It is determined by the group and enforced through rules. Dual exogamy refers to the continuous intermarriage between two groups.

Parenting: Parenting encompasses the nurturing and guidance provided to a child, facilitating their overall growth and well-being. It involves fostering physical, emotional, social, spiritual, and cognitive development from infancy through adulthood. Parenting goes beyond biological ties, emphasizing the intricate process of raising a child.

Family planning: Family planning is about deciding how many children to have and when to have them. Factors like marital status, career, and financial situation can influence these decisions. Contraception and other methods are used to control the timing of reproduction when sexually active.

Adoption: Adoption is a process where one person becomes the parent of another, often a child, by legally assuming all rights and responsibilities from the biological parents.

Orphan: An orphan is a child whose parents have died, are unknown, or have permanently abandoned them. It can also refer to a child who has lost only one parent.

Husband: A husband is a man who is married and considered a spouse. The rights, responsibilities, and societal status of a husband can vary across cultures and historical periods.

Wife: A wife is a woman in a marital relationship, referred to as a widow when her partner dies. She remains a wife until legally divorced. The rights, obligations, and status of a wife vary between cultures and have changed over time.

Godparent: A godparent is a person who witnesses a child's baptism in Christianity and supports their religious education and spiritual growth. In some countries, godparents also had legal obligations. Whether in religious or civil contexts, godparents are chosen by parents to guide and mentor the child and may act as legal guardians if necessary. A godfather is a male godparent, while a godmother is a female godparent. The child being baptized is called a godchild.

Pet: A pet is an animal kept mainly for companionship or entertainment rather than for work, livestock purposes, or research. Popular pets are often chosen for their cute appearance, intelligence, and relatable personalities, although some pets are taken in simply out of altruism by their owners.

Parent: A parent is a biological progenitor or caregiver/legal guardian of a child. They contribute gametes (sperm or ovum) resulting in a 50% genetic match with their offspring. Parents can also be adoptive or through surrogacy. Orphans may be raised by grandparents or other relatives.

Father: A father is a male parent who has a relationship with a child, involving rights and obligations. This can be through biological means, such as genetic contribution or adoption. A putative father is one whose biological relationship is alleged but not confirmed. A stepfather is a non-biological male parent who is married to a child's existing parent but may not have legal rights and responsibilities.

Mother: A mother is the female parent of a child, either through giving birth or raising a child. She can also be considered a mother if she provides her egg for fertilization in gestational surrogacy.

Sibling: A sibling is a relative who shares at least one parent. Brothers and sisters are the respective male and female siblings. Those with no siblings are referred to as only children.

Twin: Twins are offspring resulting from the same pregnancy. They can be either identical, developing from one zygote, or fraternal, developing from separate eggs fertilized by different sperm. Identical twins share the same sex, while fraternal twins may or may not. In rare cases, twins can have the same mother but different fathers.

Grandparent: Grandparents are the parents of a person's mother or father. In sexually-reproducing organisms, there are a maximum of four genetic grandparents, eight great-grandparents, and so on. Around 30,000 years ago, more humans became grandparents, likely due to increased longevity. This helped preserve important information, such as finding water during droughts.

Cousin: A cousin is a relative who is the child of a parent's sibling. Specifically, a first cousin is the closest type of cousin.

Furniture: Furniture encompasses objects designed to support various human activities such as seating, eating, storage, working, and sleeping. It serves functional, decorative, and symbolic purposes, offering convenient height for work and storage. Furniture is crafted from materials like metal, plastic, and wood, often showcasing intricate woodworking joints that reflect local culture.

Bathtub: A bathtub, also called a bath or tub, is a water-holding container used for bathing people or animals. It is commonly made of acrylic, steel, cast iron, or fiberglass. Bathtubs are placed in bathrooms either alone or together with a shower.

Bed: A bed is a furniture piece designed for sleeping, resting, and relaxation.

Cabinetry: Cabinetry refers to cases or cupboards used for storage or display. They can be stand-alone or built-in to a wall. Cabinets are commonly made of wood, coated steel, or synthetic materials. Commercial grade cabinets often have a melamine-particleboard base covered with a decorative laminate like Wilsonart or Formica.

Carpet: A carpet is a floor covering with a pile made of wool or synthetic fibers like polypropylene, nylon, or polyester. It has heat-treated, twisted tufts to maintain structure. Carpets are often associated with rugs; however, rugs are smaller and not attached to the floor.

Fireplace: A fireplace is a structure made of brick, stone or metal that contains a fire. It provides a relaxing ambiance and heats a room. Modern fireplaces vary in heat efficiency based on their design.

Pillow: A pillow is a body support for comfort or therapy. It is used by humans and other species in various forms. There are different types of pillows, including throw pillows, body pillows, and decorative pillows. Pillows designed for sleeping provide support for the head and neck. Others are made to support the body while lying down or sitting. Some pillows are tailored to the human body shape for better sleep comfort. Decorative pillows used on furniture are also known as cushions.

Chair: A chair is a single-seat furniture piece with legs, a seat, and a backrest. It can be made of wood, metal, or synthetic materials and can be padded or upholstered in different colors and fabrics.

Couch: A couch, also called a sofa, is a cushioned seating furniture for multiple people. It typically has upholstered armrests, springs, and tailored cushions. While used primarily for seating, couches can also be used for sleeping. They are commonly found in homes, hotels, offices, waiting rooms, and bars. Couches come in various sizes, colors, and designs.

Shower: A shower is a bathing device that sprays warm or hot water onto a person. It typically has a drain in the floor and adjustable temperature, spray pressure, and showerhead nozzle. Showers can be simple with a swiveling nozzle or more complex with a handheld showerhead connected to a mounted bracket. They can be installed in small stalls or bathtubs with a curtain or door. Showers are popular for their efficiency compared to bathtubs and are commonly used for hygiene purposes.

Table (furniture): A table is a piece of furniture with a flat top and typically supported by 1 to 4 legs. It serves as a working surface, dining area, or for placing objects. Common types include dining room, coffee, and bedside tables. Specialized tables, such as drafting and sewing tables, are used for specific tasks like architectural drawings or sewing projects.

Chopsticks: Chopsticks, shaped pairs of sticks, have been used for over 3000 years in East and Southeast Asia. Held in the dominant hand, they serve as extensions to pick up food.

Cookware and bakeware: Cookware and bakeware are essential food preparation tools used in kitchens. Cookware includes pots, pans, and other items used on a stove, while bakeware is specifically designed for oven use. Some utensils can serve both cooking and baking purposes.

Cutlery: Cutlery refers to hand implements used for preparing, serving, and eating food in Western culture. The city of Sheffield in England is renowned for cutlery production since the 17th century. Stainless steel, invented in Sheffield during the early 20th century, brought affordable cutlery to a wider audience.

Fork: A fork is a metal utensil with a long handle and multiple narrow, curved tines. It is used to spear and hold food for cutting with a knife, or to lift food to the mouth.

Spoon: A spoon is a utensil with a shallow bowl and a handle, commonly used for eating and food preparation. It can transfer, measure, mix, stir, and serve food. Spoons are made of various materials and are used by different cultures for different purposes and foods.

Tableware: Tableware refers to the dishes, utensils, and glassware used for dining and serving food. It includes cutlery, serving dishes, and other decorative items. The variety and number of objects depend on culture, religion, cuisine, and occasion. Some cultures use bread or leaves as individual plates and may not use cutlery. Special occasions often call for higher quality tableware.

Cup: A cup is a container used for holding liquids or solids. It can be made of various materials and may have stems, handles, or other decorations. Cups are used in different cultures and social classes to quench thirst and can vary in style depending on the liquid or situation they are used for, or for decoration purposes.

Plate (dishware): A plate is a flat vessel for serving food, used for both practical and decorative purposes. It can be circular or any shape, made of water-resistant material. Plates typically have raised edges, but those without are considered bowls or dishes. They have a long history across various cultures, dating back to ancient times.

Human sexuality: Human sexuality refers to the diverse ways people express themselves sexually, including biologically, psychologically, physically, emotionally, socially, and spiritually. There is no exact definition due to historical variations, but it includes aspects of reproduction and the human sexual response cycle.

Human sexual activity: Human sexual activity refers to the ways in which humans experience and express their sexuality. It encompasses a wide range of acts, both alone and with others, done for various reasons. Engaging in sexual activity typically leads to physiological changes and arousal. It may involve conduct aimed at arousing another or improving someone's sex life, such as finding partners or engaging in personal interactions. Sexual activity follows sexual arousal.

Gender: Gender refers to the social, psychological, cultural, and behavioral aspects of being male, female, or another gender identity. It encompasses sex-based social structures, gender expression, and is often viewed in a binary way. However, some individuals identify as non-binary, outside these categories. Certain societies recognize additional genders, like the hijras of South Asia, referred to as third genders. Scholars emphasize gender's importance in social organization.

Man: A man is an adult male human, while a male human before adulthood is called a boy.

Woman: A woman is an adult female human, with the term "girl" referring to a female before adulthood.

Intersex: Intersex refers to individuals born with sex characteristics that do not align with typical male or female bodies. These variations can involve chromosomes, gonads, or genitals.

Transgender: Transgender refers to individuals whose gender identity does not align with the sex they were assigned at birth. It is an umbrella term that encompasses various identities, including transsexuals, non-binary or genderqueer individuals, and those who belong to a third gender. The term can also include cross-dressers, drag kings, and drag queens in certain contexts. However, there is no universally accepted definition of transgender.

Sexual orientation: Sexual orientation refers to an individual's long-term romantic or sexual attraction towards the opposite gender, same gender, or both, with heterosexuality, homosexuality, bisexuality, and asexuality being common categories.

Heterosexuality: Heterosexuality is a sexual orientation characterized by romantic and sexual attraction to individuals of the opposite sex or gender. It involves enduring patterns of emotional, romantic, and/or sexual attractions, which shape a person's sense of identity and can lead to membership in a community of like-minded individuals. Heterosexual individuals are commonly referred to as straight.

Homosexuality: Homosexuality refers to the sexual and romantic attraction, as well as behavior, between individuals of the same sex or gender. It is considered a sexual orientation characterized by enduring patterns of emotional and sexual attractions exclusively to people of the same sex or gender. Additionally, homosexuality encompasses a person's sense of identity, related behaviors, and belonging to a community of others who share these attractions.

Bisexuality: Bisexuality refers to a romantic or sexual attraction towards both males and females, as well as to more than one gender. It can also include attraction to people regardless of their sex or gender identity, which is called pansexuality.

Asexuality: Asexuality refers to the absence or low interest in sexual attraction or activity. It can be seen as a sexual orientation or a lack thereof, and encompasses various identities under its broad spectrum.

Birth control: Birth control, also known as contraception, is the use of methods or devices to prevent unintended pregnancy. It has been used since ancient times, but effective and safe options emerged in the 20th century. The process of planning, providing, and utilizing birth control is called family planning. However, access to birth control can be limited or discouraged in certain cultures due to moral, religious, or political reasons.

Combined oral contraceptive pill: The combined oral contraceptive pill, also known as "the pill," is a form of birth control for women that is taken orally. It contains two hormones, progestin and estrogen, which work together to prevent pregnancy by stopping ovulation and altering the menstrual cycle.

Condom: Condoms are barrier devices used during sex to prevent pregnancy and sexually transmitted infections (STIs). Both male and female condoms are available.

Sex education: Sex education, also called sexual education or sex ed, teaches about human sexuality, including anatomy, reproductive health, safe sex, birth control, and emotional relationships. Comprehensive sex education covers all these topics, while abstinence-only education focuses solely on abstaining from sex. It can be taught in schools, through public health campaigns, or by parents. In some places, it is referred to as "Relationships and Sexual Health Education."

Sexual intercourse: Sexual intercourse, also called vaginal sex, involves the insertion and thrusting of the male penis inside the female vagina for pleasure and reproduction. It can also involve anal or oral sex, fingering, dildo, and vibrator use. These activities foster physical intimacy, emotional pleasure, and human bonding.

Foreplay: Foreplay is a collection of intimate acts to arouse sexual desire in one or more persons. It includes physical activities like kissing, touching, oral and manual sex, as well as nonphysical acts like mental or verbal stimulation. The term varies in meaning among individuals, encompassing different sexual practices such as removing clothes, engaging in sexual games, and role playing.

Kiss: A kiss is a touch or pressing of lips that expresses love, passion, attraction, affection, respect, or other sentiments. It varies in cultural meaning and can symbolize romance, sexual activity, greeting, peace, or good luck. It can also be a formal or symbolic gesture indicating devotion or sacramental significance. The word kiss originated from Old English.

Orgasm: Orgasm, or sexual climax, is the pleasurable release of built-up sexual tension. It involves involuntary muscular contractions in the pelvic area and is controlled by the autonomic nervous system. Orgasms are often accompanied by muscle spasms, a euphoric feeling, and body movements/vocalizations. After orgasm, the body tends to relax due to the release of oxytocin, prolactin, and endorphins.

Oral sex: Oral sex refers to the stimulation of genitalia using the mouth, including cunnilingus (on the vulva), fellatio (on the penis), and anilingus (on the anus).

Anal sex: Anal sex refers to the act of inserting and thrusting the erect penis into a person's anus for sexual pleasure. It can also involve anal fingering, the use of sex toys, anilingus, pegging, electrostimulation, and erotic torture. Sometimes, the term "anal intercourse" specifically refers to penile-anal penetration, while "anal sex" encompasses any form of anal sexual activity, particularly between partners rather than masturbation.

Age of consent: The age of consent is the legal minimum age at which a person can consent to engage in sexual acts. If an adult has sexual activity with someone below the age of consent, it is considered child sexual abuse or statutory rape. The younger person is the victim, while the older person is the offender. Some places have "Romeo and Juliet laws" that allow for exceptions if both participants are underage and close in age.

BDSM: BDSM is an assortment of erotic practices involving bondage, dominance and submission, discipline, and sadomasochism. It encompasses various interpersonal dynamics and often includes roleplaying. Self-identification and shared experience play a vital role in being part of the BDSM community or subculture.

Fertility: Fertility refers to the ability to conceive a child, while infertility is the difficulty or inability to reproduce naturally. The fertility rate measures the average number of children born in a person's lifetime. Infertility is defined as not being able to conceive after one year of unprotected sex and is a common issue. However, fertility specialists worldwide are available to help couples facing difficulties in conceiving.

Incest: Incest is the occurrence of sexual activity between family members or close relatives. It involves people related by blood or marriage, and is universally considered immoral and prohibited. In addition to the moral aspect, there is also an elevated risk of genetic disorders in offspring as a result.

Masturbation: Masturbation is the act of sexually stimulating one's own genitals to achieve sexual pleasure, often leading to orgasm. It can involve using hands, objects, sex toys, or occasionally, the mouth. It can be done alone or with a partner, either simultaneously or by watching each other.

Pornography: Pornography refers to sexual material, like pictures, videos, and texts, designed to arouse. It is intended for adults and has evolved from cave paintings to virtual reality. Adult content is categorized as pornography or erotica.

Promiscuity: Promiscuity refers to engaging frequently in sexual activity with different partners, without being selective. It can be seen as morally judgemental and is often associated with behaviors like one-night stands. Researchers consider the frequency of these encounters as an indication of promiscuity.

Sexual attraction: Sexual attraction refers to the ability to evoke sexual desire in others. It is based on various qualities and traits, including physical appearance, behaviour, voice, and scent. Factors such as genetics, psychology, and culture influence this attraction, which is also influenced by the individual preferences and criteria of those who are attracted.

Sexual fetishism: Sexual fetishism is a fixation on a nonliving object or non-genital body part. The fetish is the object of interest, and the person with the fetish is called a fetishist. It can be seen as a normal aid to sexual excitement or a mental disorder if it causes distress or harm to someone's life. Arousal from a specific body part is called partialism.

Prostitution: Prostitution is the exchange of sexual services for payment involving physical contact with customers, posing risks of infection transfer. It is also known as commercial sex or hooking, and colloquially referred to as "the world's oldest profession." Individuals working in this field are called prostitutes or sex workers, and may be derogatorily labeled as hookers or whores.

Virginity: Virginity is the condition of never having had sexual intercourse. Originally, it referred only to sexually inexperienced women, but now it encompasses various definitions. Some heterosexuals define it as penile-vaginal penetration, while others also include oral, anal, or manual sex based on their sexual preferences.

Child: A child is a human being from birth to puberty, possibly including the developmental period of infancy. It can also refer to an unborn human. Legally, a child is a minor, typically under the age of majority, with fewer rights and responsibilities compared to adults. They are often considered incapable of making significant decisions.

Boy: A boy refers to a young male human, typically a child or adolescent. Once a male human reaches adulthood, he is typically referred to as a man.

Girl: A girl is a young female human, usually a child or adolescent, who becomes a woman when she reaches adulthood. The term "girl" can also refer to young women, be used as a synonym for daughter or girlfriend, or serve as an endearing term for adult female friends. Its usage for adult women can be derogatory in certain contexts. The term "girl" is also found in compound words like showgirl, cowgirl, and schoolgirl.

Infant: An infant or baby is a young human offspring. It is a formal synonym for the term baby and can also be used to refer to young organisms. A newborn is colloquially used to describe an infant who is only hours, days, or up to one month old. In medical contexts, a newborn or neonate is an infant in the first 28 days after birth, including premature, full term, and postmature infants.

Preadolescence: Preadolescence is a developmental stage between middle childhood and adolescence, typically occurring between ages 9-12. It marks the period before puberty and is characterized by unique challenges and anxieties.

Adolescence: Adolescence is a period of development between puberty and adulthood. It involves both physical and psychological changes, often associated with the teenage years. However, it can start earlier or end later. Puberty typically begins in preadolescence, primarily in females. Adolescence encompasses physical growth, cognitive development, and varies in duration. While age is an unreliable marker, a commonly accepted definition is someone between the ages of 10 and 19, according to the World Health Organization.

Adult: An adult refers to a fully mature human or animal capable of reproduction. In humans, it signifies social and legal independence, responsibility, and self-sufficiency. It is contrasted with minors or non-adults. Legal adulthood is typically reached at age 18, but this can vary based on legal rights, country, and psychological development.

Young adult: A young adult is a person in the years after adolescence, typically aged 18 to 40, sometimes extending into the early to mid 40s. Definitions vary, but it generally refers to individuals before middle adulthood.

Middle age: Middle age refers to the period between childhood and old age, typically from around 40-45 years to 60-65 years. This phase is associated with gradual decline in physical, cognitive, and social abilities.

Old age: Old age encompasses the later years of life when individuals surpass life expectancy. It includes various terms like elderly, seniors, and older adults. The definition of old age differs culturally and historically. Different disciplines study the aging process, diseases in older adults, technology for support, and activities tailored to older people.

Entertainment: Entertainment is an engaging activity that captivates and brings pleasure to an audience. It can take various forms such as events or activities, all designed for the purpose of entertaining and holding the attention of the audience.

Leisure: Leisure is defined as free time away from work and daily responsibilities. It is characterized by a sense of freedom and choice, and is pursued for the experience itself. Thorstein Veblen described it as nonproductive consumption of time. The concept of free time varies across disciplines, with sociology focusing on social factors and contexts, and psychology considering the mental and emotional aspects. These approaches provide quantifiable and comparable insights into leisure.

Aquarium: An aquarium is a transparent enclosure where aquatic plants and animals are displayed. It is used by fishkeepers to house fish, invertebrates, amphibians, reptiles, and plants. The term combines the Latin root aqua, meaning 'water', with -arium, meaning 'a place for relating to'.

Beauty pageant: A beauty pageant is a competition that judges and ranks contestants based on their physical attributes. Over time, pageants have expanded to include inner beauty, assessing personality, intelligence, talent, character, and charitable involvement. Private interviews and public onstage questions are used as part of the evaluation process. Initially, the term "beauty pageants" referred to the Big Four international beauty pageants.

Collecting: Collecting is a hobby that involves finding, obtaining, organizing, displaying, and preserving items of interest to an individual. Collections vary greatly in their objects, purpose, and presentation. The possibilities for collecting are endless, and collectors have explored and realized numerous subjects, although some are more popular than others.

Karaoke: Karaoke is interactive entertainment commonly found in clubs and bars, allowing people to sing along to recorded music with a microphone.

Party: A party is a social gathering hosted by someone, where invited people come together for various reasons such as socializing, recreation, or celebrating special occasions. Typical party elements include food, drinks, entertainment, and conversation.

Quiz: A quiz is a game where players answer questions on specific topics, used for assessing knowledge and skills in education. It can also be a hobby or televised for entertainment in a game show format.

Recreation: Recreation is a leisure activity that fulfills the human need for enjoyment and pleasure during discretionary time. It encompasses various activities done for fun and amusement.

Tourism: Tourism is the act of traveling for pleasure and the business that supports it. It includes activities beyond traditional holidays and involves people staying outside their usual environment for at least 24 hours, for leisure, business, or other purposes, not exceeding one consecutive year. It can be domestic or international, impacting a country's balance of payments with both incoming and outgoing implications.

Camping: Camping is an outdoor activity involving overnight stays in temporary shelters like tents or recreational vehicles. It allows participants to enjoy outdoor activities and gain educational experiences away from home. It differs from day trips or picnics by the inclusion of overnight stays.

Hiking: Hiking is a vigorous walk on trails/footpaths in the countryside. It originated in Europe during the 18th century as a leisure activity. Religious pilgrimages, involving long distances for spiritual reasons, have been practiced for much longer.

Play (activity): Play refers to activities pursued for pleasure and entertainment, driven by internal motivation. It is often associated with children but can be enjoyed at any age. Play is seen in various animals, including mammals and birds.

Playground: A playground is a designated area outdoors, often including play equipment, that is designed for children to engage in play. Some playgrounds cater to different age groups or individuals with disabilities, while others have age restrictions.

Zoo: A zoo is a place where animals are displayed to the public and sometimes bred for conservation.

Amusement park: An amusement park is a stationary park offering rides, games, and entertainment events. It provides attractions for various age groups and is more elaborate than city parks. Theme parks are a type of amusement park, with structures and attractions based on a central theme. They have multiple areas with different themes, emphasizing intricately-designed themes centered around specific subjects.

Toy: A toy is an object designed for entertainment, often used by children but also enjoyed by adults and pets. It can include items like blocks, board games, and dolls. Toys can provide exercise, cultural awareness, and educational benefits. Additionally, objects not intended as toys can be repurposed as playful tools. The term "toy" can also refer to enjoyable purchases or luxury items that provide pleasure, like high-end cars or flagship smartphones.

Action figure: An action figure is a plastic, poseable character model based on characters from various media such as films, comics, games, and TV shows. Originally created by Hasbro in 1964 to market G.I. Joe to boys, these figures are popular among boys and adult collectors.

Doll: A doll is a human-like model, often used as a toy for children. It has a global presence in traditional religious rituals and can be found in Americas, Asia, Africa, and Europe. Ancient civilizations like Egypt, Greece, and Rome first documented dolls. They have evolved from simple playthings to elaborate art. Doll manufacturing began in Germany in the 15th century, growing with industrialization and new materials like porcelain and plastic. Dolls became popular collectibles in the 20th century.

Barbie: Barbie is a popular fashion doll, created by Ruth Handler and manufactured by Mattel since 1959. It has become a figurehead for a brand of fashion dolls and accessories, dominating the toy fashion doll market for over six decades. With over a billion dolls sold, Barbie is Mattel's most profitable product line. Since 1984, Barbie has expanded into a multimedia franchise, encompassing video games, animated films, TV/web series, and even a live-action film.

Frisbee: A frisbee, also known as a flying disc, is a plastic toy used for recreational and competitive throwing and catching games. It is about 8 to 10 inches in diameter with a lip and has the shape of an airfoil. With spinning motion, it can be accurately aimed and thrown for distance. It utilizes reduced drag and increased lift to glide through the air.

Kite: A kite is a craft with wings that uses the air to generate lift and drag forces. It has tethers, anchors, and often a bridle and tail for guidance. Box kites may only have one attachment point. Anchors can be fixed or moving to balance the kite. The term is derived from the bird of prey that hovers in the air.

Lego: Lego is a popular line of plastic construction toys made by the Lego Group, based in Denmark. It includes colorful interlocking bricks, gears, minifigures, and other parts. These pieces can be used to build vehicles, buildings, robots, and more. The Lego system allows for easy assembly, disassembly, and reuse of parts to create new creations.

Marble (toy): A marble is a small spherical toy made from various materials like glass, clay, or plastic. They are commonly about 13 mm in diameter and can be used for games, marble runs, or artwork. Marbles are popular collectibles due to their nostalgic value and attractive colors.

Rubik's Cube: The Rubik's Cube is a famous 3-D puzzle invented in 1974 by Ernő Rubik. Originally called the Magic Cube, it gained worldwide recognition when it was released internationally in 1980. Over 450 million cubes have been sold, making it the world's bestselling puzzle game and toy. It won the German Game of the Year special award in 1980 and was inducted into the US National Toy Hall of Fame in 2014.

Scale model: A scale model is a smaller physical replica of an object that closely resembles its geometry. It is typically smaller than full-size prototypes such as vehicles and buildings, but larger than small-scale prototypes like anatomical structures. Models built to the same scale as the original object are called mockups.

Stuffed toy: A stuffed toy, also known as a plush toy or teddy bear, is a doll made of fabric and filled with soft material. It was first introduced by the German company Steiff in the late 19th century. Stuffed toys gained widespread popularity after the creation of the teddy bear in the United States in 1903. They are often called soft toys or cuddly toys in Britain and Australia. Many famous fictional characters, like Peter Rabbit and Winnie-the-Pooh, have been turned into patented stuffed toys. In the 1970s, Hamleys, the world's oldest toy store, acquired the rights to produce Paddington Bear stuffed toys. Additionally, Beanie Babies, created in the 1990s by Ty Warner, became highly sought-after collectibles.

Yo-yo: The yo-yo is an ancient toy with an axle, two disks, and a looped string, resembling a spool. Its existence dates back to 440 BC and it was known as a bandalore in the 17th century.

Game: A game is a structured activity for entertainment and education, often considered as work or art.

Arcade game: Arcade games are coin-operated entertainment machines found in restaurants, bars, and amusement arcades. They offer a variety of skill-based games, including video games, pinball machines, and redemption games. They are popular for their fun and interactive experiences.

Board game: Board games are tabletop games with pieces that are moved or placed on a marked board. They incorporate elements of table, card, role-playing, and miniatures games.

Maze: A maze is a puzzle consisting of paths that lead from an entrance to a goal. It can be either a branching tour puzzle or a non-branching pattern that goes through a convoluted layout. The term "labyrinth" is often used interchangeably with "maze" but can refer specifically to a single path. Mazes can have fixed pathways and walls or change dynamically during gameplay.

Puzzle: A puzzle is a game or problem that tests ingenuity or knowledge. Solvers must logically put pieces together to find the correct or fun solution. Puzzles come in various genres, including crosswords, word-search, number, relational, and logic puzzles. The academic study of puzzles is called enigmatology.

Riddle: A riddle is a puzzle presented as a statement, question, or phrase with a hidden meaning. There are two types of riddles: enigmas, which use metaphorical language and require creativity to solve, and conundra, which rely on puns in either the question or answer.

Dominoes: Dominoes are tile-based games played with rectangular pieces. Each piece has two square ends marked with a number of spots or left blank. A domino set consists of 28 tiles featuring spot counts from zero to six. The tiles are indistinguishable at the back, and the set can be used to play various games. Dominoes can also be used for the practice of domino toppling.

Mahjong: Mahjong is a tile-based game developed in 19th century China. It spread worldwide in the early 20th century and is widely played in East and Southeast Asia, as well as in Western countries. With four players, it involves skill, strategy, and luck, and is often compared to rummy. Mahjong has also gained popularity in online platforms and is different from mahjong solitaire, sometimes referred to as mahjong rummy.

Backgammon: Backgammon is a popular two-player board game with counters and dice. Its origins can be traced back thousands of years to Mesopotamia and Persia. The modern version of the game developed in 17th-century England, based on the Irish game from the 16th century.

Checkers: Checkers, also known as draughts, is a strategic board game played by two players. It involves moving uniform game pieces forward and capturing opponent pieces by jumping over them. Derived from alquerque, the game is named after the checkered board it is played on. "Draughts" comes from the verb "to draw" or "to move."

Chess: Chess is a popular board game played by two players, each controlling an army of chess pieces. The aim is to checkmate the opponent's king. Its history dates back to at least the 7th century in India. The modern rules of chess emerged in Europe in the 15th century and gained universal acceptance by the 19th century. Today, chess is widely played and enjoyed by millions around the world.

Go(game): Go is an ancient board game from China, played for over 2,500 years. The goal of the game is to encircle more territory than the opponent. With over 46 million people worldwide who know how to play, it is considered the oldest continuously played board game. Most players reside in East Asia.

Mancala: Mancala is a group of two-player strategy board games played with stones or seeds and rows of holes. The goal is to capture the opponent's pieces and secure victory.

Monopoly(game): Monopoly is a popular board game where players buy properties, develop them with houses and hotels, and collect rent from opponents. The objective is to bankrupt opponents while avoiding bankruptcy themselves. The game includes chance cards, community chest cards, and tax squares that can affect players' money. There are also house rules and various editions and spin-offs of the game. Monopoly has gained worldwide popularity, with over 275 million copies sold in more than 103 countries and printed in over 37 languages. The original game is based on Atlantic City, USA, except for Marvin Gardens.

Pachisi: Pachisi is a cross and circle board game that originated in Ancient India. It is played on a symmetrical cross-shaped board. Players move their pieces based on the number of cowrie shells thrown, with the shells' aperture determining the number of spaces to move.

Scrabble: Scrabble is a word game played by 2-4 players on a 15x15 game board. Using letter tiles, players score points by creating words in rows or columns that can be found in a dictionary.

Shogi: Shogi, also known as Japanese chess, is a highly popular strategy board game in Japan. It involves two players and is similar to Western chess, chaturanga, xiangqi, Indian chess, and janggi. The term "Shōgi" translates to a general's board game.

Xiangqi: Xiangqi, also known as Chinese chess, is a strategy board game popular in China and Vietnam. It is played by two players and belongs to the same family of games as shogi, janggi, Western chess, and Indian chess. The game is widely enjoyed in both China and areas with significant ethnic Chinese communities. In Vietnam, it is known as cờ tướng, meaning 'General's chess'.

Card game: A card game is any game using playing cards as the main tool. They can be traditional or game-specific and there are countless variations and families of related games. Some card games have standardized rules and international tournaments, while others are folk games with flexible rules that vary by region or culture.

Blackjack: Blackjack is a popular casino banking game that is played worldwide. It is a comparing card game where players compete against the dealer, using decks of 52 cards. Descending from a family of card games known as "twenty-one," it shares similarities with European games like vingt-et-un and pontoon, as well as the Russian game Ochko. Unlike other casino games, players do not compete against each other.

Contract bridge: Contract bridge is a popular trick-taking card game played by four players in two competing partnerships. Partners sit opposite each other and the game is played with a standard 52-card deck. It is widely played worldwide in clubs, tournaments, online, and at home among seniors. The World Bridge Federation is the governing body for international competitive bridge, with regional bodies overseeing the game at a local level.

Poker: Poker is a card game that involves players wagering on the best hand. It is played worldwide with varying rules. Originally played with 20 cards, it is now commonly played with a standard deck. However, in some countries, shorter packs are used. Poker games differ in deck configuration, number of cards in play, and betting rounds.

Tarot: Tarot is a pack of playing cards originating from Italy in the mid-15th century. It spread throughout Europe and evolved into various games like Tarocchini and Grosstarok. In the late 18th century, French occultists associated it with divination, resulting in custom decks for tarot card reading. Today, there are two types of tarot packs: those used for card games and those used for divination, with some older patterns occasionally used for cartomancy.

Video game: A video game is an electronic game that allows players to interact through a user interface, generating visual feedback on a display device like a TV, computer monitor, or handheld touchscreen. It usually includes audio and other sensory feedback, and can support microphone and webcam inputs for in-game communication and livestreaming.

Video game console: A video game console is an electronic device that displays and plays video games. It can be a home console, connected to a TV and controlled with a game controller, or a handheld console with its own screen and built-in controller. Hybrid consoles combine features of both.

Tetris: Tetris, created by Alexey Pajitnov in 1985, is a popular puzzle video game. It has been published by various companies for different platforms. The rights of the game were in dispute during the late 1980s but eventually reverted back to Pajitnov in 1996. He then co-founded the Tetris Company with Henk Rogers to handle licensing.

Pokémon: Pokémon is a Japanese media franchise featuring video games, TV shows, movies, and a trading card game. It revolves around a world where humans and Pokémon coexist, with Pokémon being diverse species with unique abilities. While geared towards children aged 5 to 12, it also appeals to people of all ages.

Gambling: Gambling is the act of betting something valuable on a random event to win something else valuable. It involves consideration, chance, and a prize. The outcome can be immediate or take a longer time, such as predicting the outcome of a sports contest or season. Instances of strategy are not typically considered in gambling.

Casino: A casino is a gambling facility often found near tourist attractions. It may feature hotels, restaurants, and retail shops. Some casinos also offer live entertainment like comedy shows and concerts.

Dice: Dice are small objects used in games that can land on various marked sides. They are primarily used for random value generation in tabletop games, including dice games, board games, role-playing games, and games of chance.

Lottery: A lottery is a gambling game where numbers are randomly drawn for a prize. Some governments outlaw lotteries, while others organize national or state lotteries. Governments often regulate lotteries, typically prohibiting sales to minors and requiring licensed vendors. Lotteries were illegal in the US and much of Europe until after World War II. In the 1960s, lotteries re-emerged as a revenue source for governments worldwide.

Roulette: Roulette is a casino game derived from Biribi, offering players multiple betting options. They can bet on a specific number, groupings of numbers, red or black colors, odd or even numbers, or high and low number ranges.

Slot machine: A slot machine, also called a fruit machine or poker machine, is a gambling device that offers games of chance. It is known as a one-armed bandit due to the mechanical lever on early versions, and its ability to quickly deplete players' money.

Hide-and-seek: Hide-and-seek is a children's game where players hide and one or more seekers try to find them. One player counts with closed eyes while others hide. The seeker then calls out and tries to locate all the hidden players.

Hopscotch: Hopscotch is a children's game played with a small object called a lagger. Players toss it into numbered shapes on the ground and then jump through the spaces to retrieve it. It is a physical and cognitive exercise that can be played alone or with others.

Tag (game): Tag is a popular playground game played worldwide. Players chase each other and try to touch or tag them to eliminate them from play. No teams, scores, or equipment are needed. The person who is tagged becomes "It" and has to tag others. Known by different names globally, like "running and catching" in India and "catch and cook" in the Middle East.

Crossword: A crossword is a word game where solvers enter words or phrases into a grid. Entries cross each other horizontally and vertically. Clues guide the placement of each entry. Black squares separate entries, while white squares contain one letter. The first white square is numbered to match its clue.

Jigsaw puzzle: A jigsaw puzzle is a tile-based game that involves assembling irregularly shaped interlocking pieces to form a complete picture.

Pinball: Pinball is a game where a ball is propelled into a table filled with obstacles, scoring points as it bounces around. Originally, the table had nails and pockets for scoring, but today it is played on specially designed machines in arcades. The objective is to hit lights, bumpers, ramps, and other targets to score as many points as possible using flippers. The game usually ends when all balls are lost. Major manufacturers of pinball machines include Bally Manufacturing, Gottlieb, Williams Electronics, and Stern Pinball.

Sport: Sport refers to physical activities or games that are competitive and organized, aiming to enhance physical abilities while providing enjoyment for participants and entertainment for spectators. It improves physical health and offers a wide range of options with different numbers of participants, either as individuals or teams. Sports can involve races with one winner, contests between two sides, or even ties, with tie-breaking methods if necessary. Tournaments and leagues contribute to determining champions through regular seasons and playoffs.

Doping in sport: Doping in sport refers to athletes using banned drugs to cheat and enhance their performance. This unethical practice is widely regulated by sporting organizations like the International Olympic Committee. Athletes who try to evade detection through deception aggravate the ethical violation.

Extreme sport: Extreme sports, also known as action or adventure sports, are high-risk activities that typically involve speed, height, intense physical effort, and specialized equipment. They are closely related to extreme tourism, sharing the common thrill of adrenaline caused by a certain level of risk, while differing mainly in the level of commitment and expertise required.

Women's sports: Women's sports refers to the involvement of women and girls in physical activities and exercise across time. Participation varies due to factors like geography and economic development. Organized sports for both genders began during the late industrial age.

Mascot: A mascot is a person, animal, or object that is believed to bring luck and represents a group with a common identity, like a school or sports team. It can also serve as a fictional spokesperson for consumer products.

Stadium: A stadium is a venue for outdoor events, sports, and concerts. It includes a field or stage, surrounded by a tiered structure that allows spectators to view the event.

Sports equipment: Sports equipment, or sporting goods, includes a wide range of tools, gear, and apparel used for sports. It varies depending on the sport and may include balls, nets, helmets, and other protective gear. The evolution of sporting equipment has been driven by the need for increased player safety. It can be found in department stores and specialized sporting equipment shops.

Ball: A ball is a versatile round object used in various activities such as sports, catch, and juggling. It is also employed in engineering as low friction ball bearings and in black-powder weapons as projectiles.

Asian Games: The Asian Games, also known as Asiad, is a major multi-sport event held every four years for athletes from across Asia. It was initially regulated by the Asian Games Federation until 1978, and has been organized by the Olympic Council of Asia since 1982. These Games are recognized by the International Olympic Committee and are considered the second largest multi-sport event after the Olympics.

Olympic Games: The Olympic Games are leading international sporting events that feature thousands of athletes from around the world competing in summer and winter sports. They are considered the world's foremost sports competition and often substitute for World Championships. The Games are held every four years, alternating between summer and winter Olympics.

Ancient Olympic Games: The Ancient Olympic Games were athletic competitions held in honor of Zeus at the religious sanctuary of Olympia in Ancient Greece. They began in 776 BC and were held every four years. The games ended in AD 393, possibly due to a fire that destroyed the temple of the Olympian Zeus.

Paralympic Games: The Paralympic Games, or Paralympics, are international multisport events for athletes with disabilities. They occur after the Olympic Games and are governed by the International Paralympic Committee (IPC). The Paralympics happen both in winter and summer.

Summer Olympic Games: The Summer Olympic Games, or Summer Olympics, is a major international multi-sport event held once every four years. The Games began in 1896 in Athens, Greece and the most recent edition was held in 2021 in Tokyo, Japan. The International Olympic Committee (IOC) organizes the Games and awards gold, silver, and bronze medals. The Summer Olympics are renowned as the largest and most prestigious multi-sport event globally.

Winter Olympic Games: The Winter Olympic Games is a major international multi-sport event held every four years for snow and ice sports. It was inspired by the ancient Olympic Games and was founded by the International Olympic Committee. The first Winter Olympics took place in 1924 in Chamonix, France. The original Winter Olympic sports included bobsleigh, curling, ice hockey, Nordic skiing, and skating. The Games were initially held in the same year as the Summer Olympics until 1992 when they were alternated every four years. World War II interrupted the Games in 1940 and 1944.

American football: American football, or gridiron football, is a team sport played on a rectangular field with goalposts. The offense tries to advance by running or passing the ball, while the defense aims to stop them. The offense has four downs to move the ball ten yards, with success leading to four more downs. Scoring is achieved by reaching the end zone for a touchdown or kicking the ball through the opponent's goalposts for a field goal. The team with the most points wins.

Super Bowl: The Super Bowl is the championship game of the NFL, played annually since 1966. It replaced the NFL Championship Game and determines the season's winner. The game is currently held on the second Sunday in February, but dates and months have varied in the past. The winning team receives the Vince Lombardi Trophy, named after the coach who won the first two Super Bowls. Non-sponsoring corporations refer to the event as the "big game" due to trademark restrictions. The game day is often known as "Super Bowl Sunday" or "Super Sunday."

Association football: Association football, also known as soccer, is a team sport played with 11 players on each side. The game is played on a rectangular pitch, and the objective is to score more goals than the opposing team by kicking the ball into the opponent's net. Matches consist of two halves of 45 minutes each, totaling 90 minutes. With around 250 million active players in over 200 countries and territories, football is the most popular sport worldwide.

FIFA World Cup: The FIFA World Cup, or simply the World Cup, is an international football competition for senior men's national teams. It is organized by FIFA and held every four years since 1930, except during World War II. The current champions are Argentina, who won their third title in 2022.

Australian rules football: Australian rules football, also known as Aussie rules or footy, is a contact sport played on an oval field. Two teams of 18 players aim to score points by kicking an oval ball through goal posts. The goals can be between the central goal posts or between the central and outer posts.

Bandy: Bandy is a winter ball sport played on ice. Two teams slide on ice while using sticks to score goals in the opposing team's net.

Baseball: Baseball is a bat-and-ball sport played between two teams of nine players. The offensive team aims to hit the ball into the field and advance around four bases to score runs. The defensive team tries to prevent the offensive team from scoring by stopping batters from becoming runners and stopping runners from advancing. A run is scored when a runner legally touches home plate after going around all the bases.

Basketball: Basketball is a team sport played on a rectangular court. The objective is to shoot the basketball through the opposing team's hoop while guarding one's own. Field goals are worth two points, unless made from behind the three-point line, which is worth three. Fouls result in timed play stops and the fouled player receives one to three one-point free throws. The team with the most points wins, and if tied, overtime is played.

Basque pelota: Basque pelota is a collection of court sports involving a ball played by hand, racket, bat or basket. It can be played against a wall or face-to-face with teams separated by a line or net. Its origins can be traced back to ancient Greek and other cultures.

Cricket: Cricket is a bat-and-ball game with two teams of eleven players. The game is played on a field with a 22-yard pitch in the center, featuring two bails balanced on three stumps as wickets at each end. The batting side scores runs by hitting the ball bowled at the wickets and running between them. The bowling and fielding side tries to dismiss each batter by various means such as hitting the stumps or catching the ball. The innings ends after ten dismissals, after which teams switch roles. The game is overseen by two umpires, with assistance from a third umpire and match referee in international matches. Off-field scorers record the statistical information of the game.

Cricket World Cup: The Cricket World Cup is the ultimate One Day International (ODI) cricket championship organized by the International Cricket Council (ICC) every four years. It includes preliminary rounds leading to a finals tournament and is highly regarded as the pinnacle championship of cricket. The event attracts a massive audience worldwide, making it one of the most watched sporting events globally and is considered the flagship event of the international cricket calendar.

Curling: Curling is a sport played on ice where two teams slide heavy stones towards a circular target. Each team has four players who take turns throwing two stones. The goal is to accumulate the most points by having stones closest to the center of the target. A game typically consists of eight or ten rounds.

Field hockey: Field hockey is a team sport played with 11 players, including a goalkeeper. The objective is to move a ball using a stick into the opponent's goal. Matches are played on various surfaces, and the team with the most goals wins.

Handball: Handball is a 7-player team sport where the objective is to pass and throw a ball into the opposing team's goal. Matches last two halves of 30 minutes each, and the team with the highest goal count emerges as the winner.

Ice hockey: Ice hockey is a team sport played on ice skates. Two opposing teams use hockey sticks to control and shoot a rubber disc called a puck into the other team's goal. The team with the most goals wins. There are six players on each team, including a goalie. It is a full contact sport and physically demanding. Unlike field hockey, it is played on ice.

Kabaddi: Kabaddi is an ancient Indian contact team sport played between two teams of seven players. The objective is for a raider to enter the opponent's half, touch as many players as possible, and make it back to their own half without getting tackled. Points are scored for tagged players, while the opposing team earns a point for stopping the raider. Players are taken out when touched or tackled but returned when their team scores.

Lacrosse: Lacrosse is a contact team sport using sticks and a ball, originating from indigenous people in North America in the 12th century. It has been modified over time by European colonists to create the modern collegiate and professional version, with reduced violence.

Netball: Netball is a ball sport primarily played by women and girls in schools and the Commonwealth of Nations. It involves two teams of seven players aiming to score by shooting through the opposition's goal ring while defending their own. The game is played on rectangular courts, both indoors and outdoors.

Polo: Polo is a traditional ball game played on horseback, known as one of the world's oldest team sports. Two teams, each with four mounted riders, compete to score by using a long-handled wooden mallet to hit a small hard ball through the opposing team's goal. The game typically lasts for one to two hours, divided into periods called chukkas or chukkers.

Rugby football: 'Rugby football' refers to both rugby union and rugby league, which are team sports.

Rugby league: Rugby league is a full-contact sport played by two teams of thirteen players. It is also known as rugby XIII in non-English speaking areas. The game originated in 1895 in Huddersfield, England, as a result of a split from the Rugby Football Union. The aim was to create a faster and more entertaining game. Rugby league is played on a rectangular field with H-shaped posts at each end. It is one of the two major codes of rugby football, with the other being rugby union.

Rugby sevens: Rugby sevens is a variant of rugby union, played with seven players per team in seven-minute halves. It is administered by World Rugby and widely popular at all levels. The game is played in the summer months and has a global presence, particularly in Africa, Asia, Europe, the Americas, and the South Pacific.

Rugby union: Rugby union is a close-contact team sport that originated at Rugby School in the 19th century. It involves running with an oval-shaped ball in hand. A game is played between two teams of 15 players on a rectangular field called a pitch, which has goalposts at each end.

Rugby World Cup: The Rugby World Cup is a quadrennial men's rugby tournament between top international teams. The winners are acknowledged as the sport's world champions.

Sepak takraw: Sepak takraw, also known as buka ball or kick volleyball, is a team sport played on a court similar to badminton. It involves two teams of two to four players using their feet, knees, shoulders, chest, and head to touch a ball made of rattan or synthetic plastic. It combines elements of volleyball and football, with a net and players relying solely on their feet for contact.

Softball: Softball is a variation of baseball, played with a larger ball on a smaller field. It only allows underhand pitching. The game is played competitively in club, college, and professional levels. It was invented by George Hancock in Chicago in 1887.

Tug of war: Tug of war is a strength-based sport where two teams compete by pulling on opposite ends of a rope. The goal is to bring the rope a certain distance in one direction, overpowering the opposing team's pull.

Volleyball: Volleyball is a team sport where two teams of six players compete to score points by hitting a ball onto the other team's court. It has been an official Olympic sport since 1964. Beach volleyball was added to the Olympics in 1996. There is also a sitting volleyball version in the Paralympic Games.

Beach volleyball: Beach volleyball is a team sport played on a sand court divided by a net. The objective is to send the ball over the net and ground it on the opponent's side. Players work together to prevent the opposing team from scoring.

Equestrianism: Equestrianism, or horse riding, encompasses riding, driving, and vaulting. It involves various uses of horses such as work, transport, recreation, art, and competitive sports.

Horse racing: Horse racing is an ancient sport where jockeys ride horses to compete over a set distance. The goal is to determine the fastest horse.

Angling: Angling is a fishing technique using a fish hook and fishing line to catch fish. It can be done with a fishing rod and reel or without a reel. Anglers sometimes use weighted hooks and attractive bait to lure fish. Bite indicators like floats or bells help anglers know when a fish is nearby.

Rodeo: Rodeo is a competitive equestrian sport that originated from cattle herding practices. It tests the skill and speed of cowboys and cowgirls through events like tie-down roping, steer wrestling, bronc riding, bull riding, and barrel racing. Other events like breakaway roping and pole bending may also be included. The first public cowboy contest was held in 1883 in Pecos, Texas.

Sport of athletics: Athletics is a competitive sport encompassing running, jumping, throwing, and walking. It includes track and field, road running, cross-country running, and racewalking.

Running: Running is a fast method of movement on foot, characterized by having all feet off the ground during the gait. It is different from walking in that both feet are off the ground, the legs are straighter, and the center of gravity moves in a pendulum-like motion. Running utilizes springy tendons and muscle elasticity for energy storage through changes in kinetic and potential energy within each stride. It encompasses a range of speeds, from jogging to sprinting.

Marathon: The marathon is a 42.195 km long-distance foot race, typically conducted on roads but also on trails. It can be completed by running or with a run/walk approach, and there are separate divisions for wheelchair participants. Over 800 marathons take place worldwide annually, attracting mostly recreational athletes, with some races having tens of thousands of participants.

100 metres: The 100-metre dash is a sprint race in track and field. It is the shortest common outdoor running distance and a popular event in athletics. It has been part of the Summer Olympics since 1896 for men and 1928 for women. The World Championships for this event started in 1983.

Track and field: Track and field is a sport involving running, jumping, and throwing. It takes place on a track and a field. It falls under the category of athletics, which includes road running and cross country. In British English, "Athletics" is synonymous with American "Track and Field" and includes all jumping events.

Decathlon: The Decathlon is a combined event in athletics that includes ten track and field events. It is held over two days, with winners determined by their overall performance in all events. Points are awarded for each event, rather than by position achieved. The decathlon is primarily for male athletes, while women usually compete in the heptathlon.

Discus throw: The discus throw is a track and field event where participants throw a heavy discus to achieve the longest distance. It traces its origins back to ancient Greece and is currently part of the decathlon.

High jump: High jump is a track and field event where competitors must jump over a bar without knocking it off. The Fosbury Flop is the preferred technique, where athletes run and jump head first with their back to the bar.

Hurdling: Hurdling is the act of sprinting and jumping over obstacles at high speed. Originally, hurdlers landed on both feet and stopped their momentum. Nowadays, there are specific step patterns for different types of hurdles. Hurdling is a specialized form of obstacle racing in athletics. Athletes must pass over hurdles, with disqualification for going under or intentionally knocking them over.

Javelin throw: Javelin throw is a track and field event where a 2.5 m long spear, called a javelin, is thrown as far as possible. The thrower gains momentum by running in a designated area. This event is included in both the men's decathlon and the women's heptathlon.

Long jump: The long jump is a track and field event requiring athletes to use speed, strength, and agility to jump as far as possible from a takeoff point. It is part of the "horizontal jumps" category, alongside the triple jump. This event dates back to the ancient Olympic Games and has been included in the modern Olympics since 1896 for men and 1948 for women.

Pole vault: Pole vaulting is a track and field event where athletes use a long and flexible pole, typically made from fiberglass or carbon fiber, to jump over a bar. It has been a medal event at the Olympic Games since 1896 for men and 2000 for women. The sport has historical roots with the Mycenaean Greeks, Minoan Greeks, and Celts participating in pole jumping competitions.

Shot put: Shot put is a track and field event where athletes throw a heavy spherical ball, known as the shot, as far as possible. It has been a part of the modern Olympics since 1896 for men and since 1948 for women.

Walking: Walking is a common form of movement among animals, characterized by a slower pace compared to running. It involves an "inverted pendulum" motion, where the body moves over the stiff limb or limbs with each step. This gait is observed in various creatures, even those with multiple limbs. Humans benefit from walking as it improves mental health, lowers the risk of cardiovascular disease and mortality.

Martial arts: Martial arts are combat systems practiced for self-defense, military uses, competition, and personal development. They encompass physical, mental, and spiritual aspects while serving as entertainment and preserving cultural heritage.

Boxing: Boxing is a combat sport and martial art where two individuals throw punches at each other in a boxing ring. It involves the use of protective equipment, such as gloves, hand wraps, and mouthguards, and follows a predetermined time limit.

Brazilian jiu-jitsu: Brazilian jiu-jitsu is a martial art and combat sport that emphasizes grappling, ground fighting, and submission holds. Its main objective is to force opponents into submission through joint locks or chokeholds, employing techniques that include takedowns and gaining dominant positions on the ground.

Capoeira: Capoeira is an Afro-Brazilian martial art that combines dance, acrobatics, music, and spirituality.

Chinese martial arts: Chinese martial arts, also known as kung fu, kuoshu or wushu, encompass various fighting styles that have developed over time in Greater China. These styles are characterized by common traits and are often grouped into "families." Examples of traits include exercises inspired by animals or ancient Chinese influences, such as religions and legends. Internal styles emphasize qi manipulation, while external styles focus on improving physical fitness. Classification can also be based on geographical association, such as northern and southern styles.

Fencing: Fencing is a combat sport featuring sword fighting. It includes three disciplines: foil, épée, and sabre, each with its own blade and rules. Fencers usually specialize in one discipline. The sport emerged in the late 19th century, based on traditional swordsmanship skills. The Italian and French schools influenced its development. Scoring in fencing competitions is achieved by making contact with the opponent.

Gladiator: A gladiator was an armed combatant in Ancient Rome who participated in violent battles against other gladiators, wild animals, and criminals, entertaining audiences. Some gladiators were willing volunteers, while others were slaves who endured harsh training. They were socially marginalized and segregated, even in death.

Jujutsu: Jujutsu, also called jiu-jitsu and ju-jitsu, is a Japanese martial art developed in the 1530s. It involves close combat techniques used defensively or offensively to defeat unarmed or armed opponents. Hisamori Tenenuchi founded the first Jiu-Jitsu school in Japan and it influenced various modern martial arts like judo, aikido, sambo, ARB, Brazilian jiu-jitsu, and mixed martial arts.

Karate: Karate is a martial art originating from the Ryukyu Kingdom, incorporating techniques from Chinese martial arts. It has evolved from a comprehensive combat system to a primarily striking art using punches and kicks. Additionally, ancient karate included jujutsu techniques like joint locks and throws. Practitioners are referred to as karate-ka.

Kickboxing: Kickboxing is a combat sport combining boxing and kicking techniques, practiced for self-defense, fitness, or competition. Fights occur in a boxing ring with gloves, mouth guards, and shorts, emphasizing kicks. Styles include Karate, Muay Thai, Japanese kickboxing, Lethwei, Sanda, and Savate.

Taekwondo: Taekwondo is a Korean martial art and sport that emphasizes punching and kicking techniques. Its literal translation means "kicking," "punching," and "the art or way of." Additionally, it may incorporate weapon usage.

Mixed martial arts: Mixed martial arts (MMA) is a full-contact combat sport that combines striking, grappling, and ground fighting techniques from various combat sports worldwide. The term "mixed martial arts" was first used in 1993 by television critic Howard Rosenberg when reviewing UFC 1.

Muay Thai: Muay Thai, or Thai boxing, is a combat sport known as the "Art of eight limbs," where fighters use fists, elbows, knees, and shins. It became popular internationally in the late 20th century as practitioners from Thailand competed in kickboxing and mixed-rules matches worldwide. The sport is governed by the Professional Boxing Association of Thailand, sanctioned by the Sports Authority of Thailand.

Wrestling: Wrestling is a combat sport and martial art that involves grappling with an opponent to gain advantage using various techniques within specific rules. It includes clinch fighting, throws, takedowns, joint locks, and pins. Wrestling techniques have been widely adapted in martial arts, combat sports, and military systems. While wrestling is a genuine competitive sport, professional wrestling is more focused on athletic entertainment.

Judo: Judo is a modern Japanese martial art that originated in 1882. It emphasizes jacket wrestling, known as randori, and excludes striking and weapons training. Judo's success in tournaments led to its adoption by the Tokyo Metropolitan Police Department. Judo practitioners are called judokas, and they wear a uniform called a judogi.

Sumo: Sumo is a full-contact wrestling sport where competitors, called rikishi, aim to push their opponent out of a circular ring or make them touch the ground with any body part except their feet.

Auto racing: Auto racing is a popular motorsport that involves competitive racing of automobiles.

Formula One: Formula One, also known as F1, is the highest class of international racing for open-wheel single-seater formula racing cars. It is sanctioned by the Fédération Internationale de l'Automobile (FIA) and has been a premier form of racing since 1950. The name refers to the set of rules that all participants must follow. A Formula One season consists of races called Grands Prix, held in various countries on purpose-built circuits or closed public roads.

Ice skating: Ice skating is the act of gliding on ice using metal-bladed skates. It is enjoyed for recreation, exercise, competition, and as a means of transportation. Skating can take place on natural bodies of frozen water or man-made indoor and outdoor rinks.

Figure skating: Figure skating is a popular winter sport where individuals, pairs, or groups perform on ice using figure skates. It was the first winter sport included in the Olympic Games in 1908. The Olympic disciplines include men's and women's singles, pair skating, ice dance, and a team event introduced in 2014. Other non-Olympic disciplines include synchronized skating, Theater on Ice, and four skating. Skaters perform two programs with various elements such as spins, jumps, moves in the field, lifts, throw jumps, and death spirals.

Speed skating: Speed skating is a competitive ice sport where participants race each other over a specific distance. There are different types: long-track, short-track, and marathon speed skating. In the Olympics, long-track is commonly called "speed skating" while short-track is known as "short track." The governing body, ISU, refers to long track as "speed skating" and short-track as "short track skating."

Roller skating: Roller skating is a versatile activity involving the use of roller skates to travel on various surfaces. It serves as both a recreational pastime and a sport, also providing a means of transportation. Roller rinks and skate parks serve as dedicated venues, but it is also commonly practiced on streets, sidewalks, and bike paths.

Skateboarding: Skateboarding is a versatile sport that involves riding a skateboard and performing tricks. It is also a recreational activity, an art form, an entertainment industry job, and a method of transportation. Originating in the United States, it has been shaped by many skateboarders over the years. The skateboarding market is worth an estimated $4.8 billion annually, with 11.08 million active skateboarders worldwide. It will be included as a sport in the 2020 Summer Olympics in Tokyo, with both male and female teams competing.

Canoeing: Canoeing is the act of propelling a canoe with a single-bladed paddle. It can be a stand-alone activity or combined with other pursuits like camping. Canoeing is primarily done for sport or recreation purposes. In Europe, canoeing also encompasses kayaking.

Diving (sport): Diving is an Olympic sport where athletes perform acrobatics while jumping or falling into water from a platform or springboard. It is also a popular recreational activity for non-competitive purposes.

Underwater diving: Underwater diving is the practice of descending beneath the water's surface to interact with the environment. It involves immersion in water and exposure to high ambient pressure, which have physiological limitations on depth and duration. To extend human dives and enable different types of work, various equipment has been developed.

Scuba diving: Scuba diving is a form of underwater diving where divers utilize breathing equipment that is independent of surface air supply. The term "scuba" is derived from "Self-Contained Underwater Breathing Apparatus," coined in 1952. Scuba divers carry their own source of breathing gas, allowing them more freedom and time underwater than other divers. The use of enriched air or nitrox has gained popularity for longer dives, while helium can be added to decrease the risk of nitrogen narcosis during deeper dives.

Rowing (sport): Rowing, also known as crew, is a sport that involves racing boats with oars. The oars are attached to the boat using oarlocks, distinguishing rowing from paddling sports. It is divided into two disciplines: sculling, where each rower holds two oars, and sweep rowing, where each rower holds one oar with both hands. There are various boat classes, from single sculls to eights with a coxswain. Races typically take place on calm water courses of 2 kilometers, marked with buoys.

Sailing (sport): Sailing (sport) is a competitive activity involving various racing formats that are regulated by sailing federations and yacht clubs. These formats include fleet races, match races, and team competitions. It also includes specialized events for setting speed records. Races can take place in sheltered waters, along the coast, or in the open ocean, and can be either closed courses or point-to-point contests. Competitions are usually organized within specific classes or ratings to ensure fair and skill-focused contests.

Surfing: Surfing is a water sport where a person rides a board on the front of a wave, often towards the shore. It is primarily done in the ocean but can also occur in standing waves, lakes, rivers, or wave pools.

Swimming: Swimming is the act of propelling oneself through water for various purposes such as recreation, exercise, sport, or survival. It involves coordinated movements of the limbs and body to generate hydrodynamic thrust, resulting in directional motion. Humans possess the ability to hold their breath and start swimming shortly after birth as a survival instinct.

Swimming (sport): Swimming is a popular Olympic sport that involves racing through water using the entire body. It can take place in pools or open water. Competitive swimming includes various distance events in different strokes, such as butterfly, backstroke, breaststroke, freestyle, and individual medley. Four swimmers can also participate in relay races, either freestyle or medley, where each swimmer takes a different stroke in a specific order (backstroke, breaststroke, butterfly, and freestyle).

Swimming pool: A swimming pool, or simply pool, is a water-filled structure for swimming and leisure activities. It can be above ground or in-ground, and is found on ocean-liners and cruise ships too. In-ground pools are typically made of materials like concrete, stone, metal, plastic, or fiberglass. They can be custom-sized or standardized, with the largest being Olympic-size.

Water polo: Water polo is a team sport played in water, with two teams of seven players. The objective is to score goals by throwing the ball into the opposing team's goal. The team with the most goals wins the match. Each team consists of six field players and one goalkeeper, who play both offensive and defensive roles. The game is played in a pool where players cannot touch the bottom.

Skiing: Skiing is gliding on snow using skis and can serve as transport, recreation, or a competitive sport. International organizations like the IOC and FIS recognize various skiing events.

Alpine skiing: Alpine skiing, also known as downhill skiing, involves sliding down snow-covered slopes using skis with fixed-heel bindings. It is primarily enjoyed at ski resorts, which offer various facilities such as ski lifts, artificial snow making, grooming, and ski patrol services for both recreational and competitive purposes.

Cross-country skiing: Cross-country skiing is a sport and recreational activity where skiers travel on snow-covered terrain without ski lifts. It is also used as a means of transportation. It offers various variants suitable for different terrains, from unimproved areas to groomed courses.

Ski jumping: Ski jumping is a winter sport where competitors slide down a curved ramp on skis to achieve the longest jump. The sport originated in Norway in the late 19th century and has since spread across Europe and North America. Jump length, aerial style, and other factors determine the final score. Ski jumping is part of the traditional group of Nordic skiing disciplines along with cross-country skiing.

Slalom skiing: Slalom skiing is a fast-paced alpine discipline where skiers navigate between poles spaced closely together, requiring quick and short turns. It is a part of international competitions like the FIS Alpine World Ski Championships and the Olympic Winter Games.

Sled: A sled is a land vehicle designed for sliding on ice or snow. It has smooth runners that reduce friction and can carry heavy loads.

Bobsleigh: Bobsleigh, also known as bobsled, is a gravity-powered winter sport where teams of 2 to 4 athletes race down iced tracks. The sport is governed by the International Bobsleigh and Skeleton Federation.

Luge: Luge is a sport that involves riding a small sled supine and feet-first. Participants start seated and steer using their calf muscles or shoulder pressure. Racing sleds weigh 21-30 kg. It is also an Olympic sport.

Snowboarding: Snowboarding is a popular recreational and competitive sport where participants descend snowy slopes while standing on a board attached to their feet. This exciting activity is showcased in both the Winter Olympic Games and Winter Paralympic Games.

Archery: Archery is the skill of using a bow to shoot arrows, derived from the Latin word for bow. Historically used for hunting and combat, it is now primarily a competitive sport and recreational activity. Practitioners are commonly referred to as archers, bowmen, or toxophilites.

Arm wrestling: Arm wrestling is a sport where opponents bend their elbows and grip hands on a table, aiming to bring their opponent's hand down. It determines the stronger person between two or more individuals.

Badminton: Badminton is a racquet sport played with teams or individually, using a shuttlecock and racquets to hit it across a net. It can be played casually outdoors or formally on an indoor court. Points are scored by hitting the shuttlecock within the opponent's half of the court.

Bullfighting: Bullfighting is a contest in which a bullfighter tries to subdue or kill a bull following rules and cultural traditions.

Bowling: Bowling is a popular target sport and recreational activity where players roll a ball towards pins or targets. It usually refers to pin bowling, but in the UK and Commonwealth countries, it can also encompass target bowling like lawn bowls.

Bocce: Bocce, also known as bocce ball or boccie, is a ball sport within the boules family. It originated in Italy and shares similarities with British bowls and French pétanque, tracing back to ancient Roman games. Bocce is played across Europe, as well as in immigrant communities in Australia, North America, and South America. Initially played by Italian immigrants, the game has gained popularity among their descendants and people worldwide.

Bowls: Bowls, or lawn bowling, is a sport where players aim to roll biased balls to stop near a smaller ball called a "jack" or "kitty". It is played outdoors on a flat, convex, or uneven surface like natural grass, artificial turf, or cotula.

Ten-pin bowling: Ten-pin bowling involves rolling a ball down a lane towards ten pins arranged in a triangular pattern. The goal is to knock down all the pins in one or two rolls.

Bodybuilding: Bodybuilding is the progressive resistance exercise to develop, control, and strengthen muscles through hypertrophy. It is primarily driven by aesthetics rather than functionality and differentiates from powerlifting, which emphasizes increasing physical load.

Croquet: Croquet is a sport where players use a mallet to hit balls through hoops on a grass court.

Cue sports: Cue sports, also known as billiards, are a collection of skill-based games played on a cloth-covered table using a cue to strike balls. The table is surrounded by elastic bumpers called cushions.

Carom billiards: Carom billiards, known as French or carambole billiards, is a collection of cue sports played on pocketless tables. The goal is to score points by making the cue ball hit both the opponent's ball and the target ball on one shot. Its origins are unclear, but it is believed to have originated in 17th-century France.

Pool (cue sports): Pool is a type of cue sport played on a table with six pockets. It includes various specific games like eight-ball, nine-ball, and straight pool. Eight-ball is the most popular version and is often used interchangeably with the term "pool."

Snooker: Snooker is a cue sport played on a rectangular table with six pockets. It originated in the 19th century and is played with 22 balls, including a white cue ball, red balls, and colored balls. Players use a cue stick to pot balls in a specific order, accumulating points. The player with the most points wins a frame, and the match ends when a predetermined number of frames is reached.

Cycling: Cycling, or biking, is the act of riding a bicycle or other human-powered vehicles like unicycles or tricycles. It is a globally practiced activity for transportation, recreation, exercise, and competitive sport.

Cycle sport: Cycle sport is a form of competitive physical activity involving bicycles. It encompasses various categories, such as road racing, cyclo-cross, mountain biking, track cycling, BMX, and cycle speedway. Non-racing cycling sports include artistic cycling, cycle polo, freestyle BMX, mountain bike trials, and cycleball. The Union Cycliste Internationale (UCI) serves as the global governing body for cycling and official cycling events. The International Human Powered Vehicle Association governs human-powered vehicles with fewer design restrictions than UCI. Additionally, the UltraMarathon Cycling Association oversees numerous ultra-distance cycling races.

Mountain biking: Mountain biking is an off-road sport using specialized bikes designed for rough terrains. These bikes have features like suspension shocks, wider tires, sturdier frames, and powerful brakes. The sport encompasses five categories: cross country, trail riding, all mountain, downhill, and freeride.

Tour de France: The Tour de France is a prestigious annual cycling race held in France. It is the oldest and most prestigious of the three Grand Tours.

Darts: Darts is a competitive sport where players throw small, sharp darts by hand at a round target called a dartboard.

Golf: Golf is a sport where players use clubs to hit a ball into holes on a course in as few strokes as possible.

Gymnastics: Gymnastics is a sport with physical exercises that challenge balance, strength, flexibility, agility, coordination, artistry, and endurance. It develops various muscle groups and originated from ancient Greek exercises and circus performances.

Mountaineering: Mountaineering, also known as alpinism or mountain climbing, encompasses outdoor activities that involve ascending mountains. It includes traditional climbing, skiing, traversing via ferratas, as well as indoor climbing, sport climbing, and bouldering which are considered variants of mountaineering by some. These activities have become sports in their own right and are part of a wide group of mountain sports.

Orienteering: Orienteering is a group of sports that involve using a map and compass to navigate in unfamiliar terrain at high speed. Participants are given a specially prepared orienteering map and must locate control points. Originally a military training exercise, orienteering has evolved into various forms, with foot orienteering being the most popular. Any sport that involves racing against a clock and requires map navigation is considered a type of orienteering.

Rock climbing: Rock climbing is a challenging sport that involves ascending natural rock formations or indoor walls. The objective is to reach the top without falling by following designated routes. It requires physical strength, endurance, agility, balance, and mental control. Proper climbing techniques and specialized equipment are necessary for safety.

Shooting sports: Shooting sports refer to competitive and recreational activities that test accuracy, precision, and speed in using ranged weapons like small arms, bows, and crossbows.

Biathlon: Biathlon is a winter sport combining cross-country skiing and rifle shooting. Contestants race through a trail, stopping at shooting ranges. Missed shots lead to penalties and additional distance or time added to the total.

Squash (sport): Squash is a racket-and-ball sport played by 2 or 4 players in a four-walled court. The objective is to hit the ball in a way that the opponent cannot return it. With around 20 million regular players in over 185 countries, squash is recognized by the IOC and included in the Olympic Games starting in 2028. The World Squash Federation governs the sport, while the Professional Squash Association organizes the pro tour.

Table tennis: Table tennis is a racket sport played on a stationary table. Players use small rackets to hit a light ball over the net, aiming to make it land on the opponent's side of the court. The game is fast-paced and requires quick reactions and focus. Spin plays a significant role, affecting the ball's trajectory.

Tennis: Tennis is a racket sport played individually or in teams of two. Players use a strung racket to hit a rubber ball over a net into the opponent's court. The objective is to prevent the opponent from returning the ball, earning points in the process.

Olympic weightlifting: Olympic weightlifting is a sport in which athletes compete to lift the heaviest weights using a barbell. Competitors perform two specific lifts: the snatch, where the barbell is lifted overhead in one motion, and the clean and jerk, which involves lifting the barbell from the ground to the front of the shoulders and then overhead. In the past, there was a third lift called the clean and press.

Powerlifting: Powerlifting is a strength sport where athletes aim to lift the heaviest weight possible in three different exercises: squat, bench press, and deadlift. It evolved from a sport called "odd lifts" that involved various events, but eventually became standardized to the current three lifts format.

Major League Baseball: Major League Baseball (MLB) is a professional baseball league, comprising 30 teams divided equally between the National League (NL) and the American League (AL). It is the oldest major professional sports league globally, formed in 1876 and 1901. MLB remained separate until 2000 when it merged into a single organization led by the Commissioner of Baseball. The league is headquartered in Midtown Manhattan.

National Basketball Association: The NBA is North America's top professional basketball league with 30 teams. It is regarded as the leading professional basketball league globally, and is one of the major sports leagues in the United States and Canada.

National Football League: The NFL is a professional American football league with 32 teams in the United States and Canada. It is the highest level of American football worldwide and consists of two conferences: the AFC and NFC. The season begins in August with a three-week preseason, followed by an 18-week regular season from September to January. Each team plays 17 games and has one bye week. The playoffs involve seven teams from each conference, leading to the Super Bowl in February.

National Hockey League: The National Hockey League (NHL) is a top-ranked professional ice hockey league in North America with 32 teams, 25 in the US and 7 in Canada. It awards the prestigious Stanley Cup annually to the playoff champion. As one of the major leagues in the US and Canada, it attracts players from 17 countries. The International Ice Hockey Federation (IIHF) recognizes the Stanley Cup as one of the sport's most significant championships.

La Liga: La Liga, officially known as LaLiga EA Sports, is the top professional football league in Spain. It is organized by the LFP and consists of 20 teams competing in a 38-matchday season.

Premier League: The Premier League is the top tier of English football with 20 clubs that can be promoted or relegated. It runs from August to May, featuring 38 matches for each team against all others. Matches are mostly held on Saturdays and Sundays, sometimes on weekday evenings.

UEFA Champions League: The UEFA Champions League is an annual European club football competition organized by UEFA. It features top-division European clubs competing in a round robin group stage, followed by knockout rounds and a single leg final. It is the most watched club competition globally and highly esteemed in European football, showcasing national league champions.

Social science: Social science is a branch of science that studies societies and the relationships among individuals. Originally focused on sociology, it now includes various disciplines like anthropology, archaeology, economics, geography, linguistics, management, communication, and political science.

Meme: A meme is a cultural idea or behavior that spreads through imitation, often expressing symbolic meaning. It serves as a carrier of cultural ideas, symbols, or practices, transmitted through various means like writing, speech, or gestures. Memes are seen as cultural counterparts to genes, replicating, mutating, and adapting to selective pressures. In modern usage, a meme may refer to internet memes, which are shared cultural experiences involving remixed and circulated images online.

Safety: Safety is about being protected from harm and danger. It involves controlling recognized hazards to minimize risks and achieve an acceptable level of safety.

Humanities: Humanities is the study of human society and culture, focusing on fundamental questions. Originally, it referred to the study of classical literature and language. Today, it encompasses any fields of study outside of natural, social, formal, and applied sciences. Humanities use critical, speculative, and interpretative methods, with a strong historical component, distinguishing them from empirical scientific approaches.

Information: Information refers to the power to inform and interpret what can be sensed. It includes both observable patterns and non-random natural processes. While digital signals convey information through discrete signs, other mediums like analog signals or art forms convey it more continuously. Information is not knowledge itself, but the meaning derived from interpreting representations.

Psychology: Psychology is the study of mind and behavior, including conscious and unconscious phenomena, thoughts, feelings, and motives. It is an academic discipline that spans natural and social sciences, aiming to understand human and nonhuman behavior. Biological psychologists link psychology to neuroscience by studying the properties of brains, while psychologists as social scientists strive to understand behavior in individuals and groups.

Clinical psychology: Clinical psychology is a field that combines various sciences to comprehend and address psychological distress, enhance well-being, and stimulate personal growth. It utilizes assessment, formulation, and therapy techniques, but clinical psychologists are also involved in research, teaching, consultation, and forensic testimony. Additionally, clinical psychology is regulated in several countries as a mental health profession.

Cognitive psychology: Cognitive psychology is the scientific study of mental processes like attention, memory, problem solving, language use, perception, creativity, and reasoning.

Developmental psychology: Developmental psychology is the study of human growth, change, and adaptation. It covers infants, children, adolescents, adults, and aging. The field aims to explain how thinking, feeling, and behaviors evolve, focusing on physical, cognitive, and social emotional dimensions. It explores various topics such as motor skills, language acquisition, personality, and identity formation.

Personality psychology: Personality psychology studies the differences in individuals' personalities caused by psychological forces. It investigates the development of personalities, the mental processes involved, and their impact on functioning. It provides a framework to understand the uniqueness of individuals.

Psychology of religion: The psychology of religion applies psychological methods to religious traditions and individuals. It uses both scientific and humanistic approaches to study causal connections and meaningful experiences.

Psychotherapy: Psychotherapy is a psychological technique that uses personal interaction to help individuals change behavior, increase happiness, and overcome problems. It aims to improve mental health, resolve troublesome behaviors, beliefs, and emotions, while enhancing relationships and social skills. Designed for individuals, families, or children, some types of psychotherapy are evidence-based for treating diagnosed mental disorders, while others are criticized as pseudoscience.

Analytical psychology: Analytical psychology is a term coined by Carl Jung to describe his research on the psyche. It differentiates from Freud's psychoanalytic theories. Jung's work is documented in his extensive Collected Works written over six decades.

Behaviorism: Behaviorism is a systematic approach that seeks to understand human and animal behavior. It considers behavior to be influenced by environmental stimuli, reinforcement and punishment, as well as an individual's motivational state and controlling factors. While behaviorists acknowledge the role of heredity, they primarily focus on environmental factors. In modern psychology, behaviorism has been largely replaced by cognitive psychology, which explores internal mental states.

Evolutionary psychology: Evolutionary psychology is a branch of psychology analyzing cognition and behavior from an evolutionary standpoint. It aims to understand how human psychological traits and mechanisms have evolved to solve ancestral problems. These traits are viewed as products of natural or sexual selection, or as by-products of other adaptive traits.

Gestalt psychology: Gestalt psychology is a school of psychology that emerged in the early 20th century. It emphasizes the processing of whole patterns rather than just individual components. It rejects the principles of elementalist and structuralist psychology.

Humanistic psychology: Humanistic psychology emerged in response to Freud's psychoanalytic theory and Skinner's behaviorism, led by key figure Abraham Maslow. It became popular in the 1950s, emphasizing the importance of exploring one's own capabilities and creativity.

Psychoanalysis: Psychoanalysis is a theory and therapy that addresses the unconscious mind and treats mental disorders. It was established by Sigmund Freud based on the work of Josef Breuer. Freud identified key elements as the presence of unconscious mental processes, the theory of repression and resistance, and the significance of sexuality and the Oedipus complex. Adler and Jung developed related but distinct approaches. Neo-Freudian thinkers like Fromm, Horney, and Sullivan further expanded psychoanalysis.

Cognition: Cognition refers to the mental process of gaining knowledge and understanding through thought, experience, and the senses. It covers various intellectual functions like perception, attention, memory, reasoning, problem-solving, and language comprehension. Cognition involves both using existing knowledge and acquiring new knowledge.

Cognitive development: Cognitive development is the study of a child's mental growth, including information processing, language learning, and perceptual abilities, as they develop into adults. It examines qualitative differences between children and adults in how they think and understand the world. Key factors include genetics and learning. The four stages of cognitive development are reasoning, intelligence, language, and memory, starting around 18 months old. Various experiences, such as playing with toys, listening to parents, and watching TV, contribute to cognitive development.

Confirmation bias: Confirmation bias is the inclination to seek, interpret, and remember information that reinforces existing beliefs. It involves favoring information that aligns with one's views while disregarding opposing evidence. This bias is particularly pronounced for desired outcomes, emotionally charged topics, and strongly held convictions. Although difficult to overcome, it can be mitigated through education and training in critical thinking.

Amnesia: Amnesia is memory loss caused by brain damage or diseases, and can be temporary when triggered by sedatives or hypnotic drugs. The extent of damage determines the complete or partial loss of memory.

Attention: Attention is the act of concentrating on something while ignoring other stimuli. It involves selectively focusing on a specific piece of information, whether it be subjective or objective. William James emphasized that attention is the mind's ability to single out one object or thought from multiple possibilities. It is the allocation of limited cognitive resources and is limited by the brain's capacity to process data, resulting in inattentional blindness.

Consciousness: Consciousness is the awareness of internal and external existence. It has been extensively studied and debated by philosophers, theologians, and scientists. Its nature is complex and opinions vary on what aspects should be considered. In the past, it encompassed introspection and private thoughts, while today it includes cognition, experience, feelings, and perception. Consciousness can involve awareness, self-awareness, or awareness of awareness. The diverse research and speculations in this field raise questions about the right approach to understanding it.

Creativity: Creativity is the ability to generate novel and valuable ideas or objects, encompassing both tangible and intangible outcomes. It involves the process of forming something fresh and significant.

Dream: A dream is a series of images, ideas, emotions, and sensations that arise involuntarily during sleep stages. We typically spend about two hours dreaming each night, with individual dreams lasting 5 to 20 minutes. Though the dreamer may perceive the experience as longer, this summary highlights the essential aspects of dreaming.

Human behavior: Human behavior refers to the way individuals or groups respond to internal and external stimuli throughout their lives. It is influenced by a combination of genetic, environmental, and psychological factors. Thoughts and feelings play a role in shaping behavior, providing insight into attitudes and values. Personality traits vary between individuals and contribute to different actions and behavior.

Human intelligence: Human intelligence refers to the advanced cognitive abilities and self-awareness possessed by humans. It enables us to learn, create concepts, understand, reason, recognize patterns, innovate, solve problems, make decisions, retain information, and communicate through language.

Hypnosis: Hypnosis is a state of focused attention where peripheral awareness is reduced, allowing individuals to be more responsive to suggestions.

Imagination: Imagination is the ability to create sensations, thoughts, and feelings within oneself. It includes re-creating past experiences with imagined changes and inventing fantastical scenes. Imagination helps in problem-solving and is crucial for integrating experiences and learning. It can be disciplined and trained through storytelling that evokes worlds with carefully chosen words.

Introspection: Introspection refers to examining one's own thoughts and feelings. It involves observing one's mental state in psychology and soul in spirituality. Introspection is crucial for self-reflection and self-discovery, distinguishing it from external observation.

Memory: Memory is the mental ability to encode, store, and retrieve information when necessary. It enables us to retain information over time, influencing our future actions. Without memory, language, relationships, and personal identity would not develop. Memory loss, often called forgetfulness or amnesia, refers to the inability to recall past events.

Mind: The mind refers to the faculties responsible for thinking, imagining, remembering, willing, and sensing. It encompasses perception, pleasure, pain, belief, desire, intention, and emotion. The mind encompasses both conscious and non-conscious states, as well as sensory and non-sensory experiences.

Mood (psychology): A mood, in psychology, refers to an affective state that is less specific and less intense than emotions or feelings. It is often categorized as positive or negative and is not easily triggered by a specific stimulus. Various factors can influence mood, having either positive or negative effects.

Motivation: Motivation is the internal force that drives individuals to engage in goal-directed behavior. It explains why people or animals start, continue, or stop particular actions. While its definition is disputed, motivation is distinct from apathy and is studied in fields such as psychology and philosophy.

Oedipus complex: The Oedipus complex is a term in psychoanalysis that describes a son's sexual attraction to his mother and hostility towards his father, and a daughter's attraction to her father and hostility towards her mother. It was coined by Sigmund Freud and is linked to the phallic stage of development. Freud introduced the concept in his book The Interpretation of Dreams (1899) and later named it in a paper published in 1910.

Perception: Perception is the processing of sensory information to comprehend and interpret the surrounding environment. It involves the nervous system receiving signals from physical or chemical stimulation of the sensory system, such as light for vision, odor molecules for smell, and pressure waves for hearing.

Personality: Personality refers to the unique combination of behaviors, thoughts, and emotions that shape an individual's way of adapting to life. These patterns are relatively consistent but can evolve gradually over time.

Stereotype: A stereotype is a generalized belief about a group of people, including expectations about their personality, preferences, appearance, or ability. Stereotypes are often overgeneralized, inaccurate, and resistant to new information. They can be positive, neutral, or negative.

Thought: Thought refers to conscious cognitive processes, including judging, reasoning, concept formation, problem solving, and deliberation. It can occur independently of sensory stimulation and encompasses considering ideas, memory, and imagination. Thought can also include perception and unconscious mental processes. Additionally, thought can refer to mental states or systems of ideas resulting from these cognitive processes.

Emotion: Emotions are mental states triggered by changes in the body and mind, linked to thoughts, feelings, behaviors, and varying degrees of pleasure or displeasure. While a clear definition lacks consensus in science, emotions are intertwined with mood, temperament, personality, disposition, and creativity.

Agreeableness: Agreeableness is a personality trait characterized by kind, sympathetic, and cooperative behavior. It is one of the five major dimensions of personality that reflects individual differences in cooperation and social harmony.

Anger: Anger, or wrath, is an intense emotional state triggered by a perception of provocation, hurt, or threat. It involves a strong and non-cooperative response.

Anxiety: Anxiety is an unpleasant emotion that causes inner turmoil and includes feelings of dread over anticipated events. It is distinct from fear as it involves anticipation of future threats rather than an immediate response to a real threat. Anxiety is often accompanied by nervous behavior, such as pacing, physical complaints, and rumination.

Conscientiousness: Conscientiousness is a personality trait characterized by being careful, diligent, and having a strong desire to do tasks well. Conscientious individuals are efficient, organized, and show self-discipline. They take obligations to others seriously, aim for achievement, and display planned behavior rather than being spontaneous. Additionally, they are generally dependable and exhibit behaviors such as being neat, systematic, thorough, and deliberate.

Courage: Courage is the act of confronting and willingly facing challenges like agony, pain, danger, uncertainty, or intimidation. It can be synonymous with bravery, particularly in battle.

Curiosity: Curiosity is the inherent drive for exploration and learning in humans and animals. It plays a crucial role in human development, fueling the desire to acquire knowledge and skills.

Disgust: Disgust is an emotional response to something offensive, revolting, or unpleasant. It can be triggered by things that are potentially contagious or distasteful. Disgust is closely connected to the sense of taste, as well as smell, touch, and vision. It can even be experienced in response to disharmonious sounds. Research shows a link between disgust and anxiety disorders like arachnophobia and obsessive-compulsive disorder related to contamination fear.

Doubt: Doubt is a mental state of uncertainty and indecision between contradictory propositions. It involves a lack of conviction, distrust, and may lead to delaying or rejecting action due to fear of making mistakes or missing opportunities.

Extraversion and introversion: Extraversion and introversion, first introduced by Carl Jung, are traits that play a central role in human personality theories. Extraversion is characterized by outgoing and energetic behavior, while introversion is marked by reflective and reserved behavior. Jung defined introverts as being focused on subjective thoughts, while extraverts concentrate on external stimuli.

Fear: Fear is a strong and unpleasant emotion triggered by perceiving a danger or threat. It leads to psychological changes and can cause aggressive actions or avoidance. Fear can be in response to a current stimulus or anticipated future danger. It prompts us to confront or escape from the threat, sometimes resulting in freezing.

Guilt (emotion): Guilt is a moral emotion experienced when a person believes they have compromised their own standards of conduct or violated universal moral standards, leading to a significant sense of responsibility. It is closely linked to remorse, regret, and shame.

Happiness: Happiness is a positive emotion, ranging from contentment to intense joy, triggered by positive experiences or thoughts. It can also arise with no obvious cause. The level of happiness for longer periods is strongly correlated with life satisfaction, well-being, flourishing, and eudaimonia. The word happy is often used to appraise these measures or as a shorthand for a source of happiness. Defining happiness precisely has been an ongoing debate in philosophy.

Hatred: Hatred is a strong negative emotion directed at people, things, or ideas, typically stemming from opposition or repulsion. It encompasses intense feelings of anger, contempt, and disgust, often regarded as the opposite of love.

Hope: Hope is an optimistic mindset based on anticipating positive outcomes in life or the world. It involves expecting with confidence and cherishing desires with anticipation.

Humour: Humour is a quality that stimulates laughter and amusement. It originates from ancient Greek humoral medicine, which believed that bodily fluids, known as humours, influenced human well-being and emotions.

Love: Love refers to a variety of strong and positive emotions, from deep affection to simple pleasure. It encompasses different meanings, such as the love of a mother, spouse, or even for food. Primarily, it is a powerful attraction and emotional attachment.

Lust: Lust is a strong psychological force that generates intense desire for something, even if there is already a substantial amount of the desired object. It can manifest in various forms such as sexual desire, a craving for money or power, or even a longing for specific smells that trigger memories. Unlike passion, which drives individuals towards positive goals, lust is solely driven by desire and does not necessarily lead to benevolent intentions.

Neuroticism: Neuroticism is a core personality trait in psychology, characterized by high levels of moodiness and the experience of negative emotions like anxiety, anger, and guilt. Those with high neuroticism are more vulnerable to stress and tend to interpret minor difficulties as insurmountable. They may engage in maladaptive behaviors to cope with these emotions, such as substance use or procrastination.

Pleasure: Pleasure is a positive experience that feels good and is enjoyable. It contrasts with pain and suffering, and is closely linked to value, desire, and action. Various activities can be pleasurable, such as eating, sex, and listening to music. Pleasure is related to mental states like ecstasy and flow, and is important in theories of hedonism. It is distinct from happiness and well-being.

Sadness: Sadness is an emotional pain linked to feelings of despair, loss, and sorrow. It may cause individuals to become silent, withdrawn, and lethargic, distancing themselves from others. Depression, a severe form of sadness, can be triggered by major depressive disorder or persistent depressive disorder. Crying often accompanies sadness.

Self-esteem: Self-esteem is one's confidence and belief in their own value, abilities, and principles. It includes various emotional states like pride, shame, triumph, and despair. It is defined as the positive or negative evaluation of oneself and how one feels about it.

Surprise (emotion): Surprise is a sudden, mental and physical reaction to an unexpected event. It can have different emotional valences and intensity levels, ranging from very strong to mild. Animals and humans can experience surprise, which can trigger fight-or-flight response or a less intense reaction.

Suffering: Suffering refers to the unpleasant experience or aversion resulting from perceived harm or threat. It is a fundamental component of negative emotions, contrasting with pleasures and happiness.

Aggression: Aggression is hostile behavior that aims to cause harm, but can also be channeled positively. It can occur reactively or without provocation and is triggered by factors like frustration or perceived disrespect. Human aggression can be classified as direct (harming individuals physically or verbally) or indirect (harming social relations).

Altruism: Altruism is the act of prioritizing the well-being and happiness of others over oneself. It is a widely valued moral principle found in various cultures and religions, and is often synonymous with selflessness as opposed to selfishness.

Blame: Blame is the act of criticizing or holding someone accountable for socially or morally irresponsible actions or inaction. It is the opposite of praise. When a person is morally responsible for doing wrong, their action is blameworthy. On the other hand, when a person is morally responsible for doing right, their action is regarded as praiseworthy. Blame and praise can also be used in non-ethical contexts, such as commenting on someone's fashion choices.

Bullying: Bullying is repeated, forceful behavior that aims to intimidate or dominate, often involving hurtful teasing or threats. It requires an imbalance of power and distinguishes from normal conflict. Bullying is a form of aggressive behavior, characterized by hostile intent and long-term repetition.

Charisma: Charisma is an alluring personal quality that captivates others. It encompasses presence, charm, and the ability to compel and engage people.

Competition: Competition is a rivalry between parties striving for a shared goal that cannot be mutually achieved. It can occur between various entities, such as organisms, individuals, economic and social groups. The rivalry is centered around obtaining exclusive goals, which may include recognition.

Conformity: Conformity is the act of matching attitudes, beliefs, and behaviors to group norms. It often happens due to the ease of following the path others have already made. This tendency to conform occurs in small groups or society as a whole and can result from subtle unconscious influences or direct social pressure. Conformity can occur when an individual is alone as well, such as when people follow social norms while eating or watching television.

Dignity: Dignity is the modern concept of valuing and respecting individuals for their own sake. It encompasses inherent rights, morality, ethics, law, and politics, following the principles of the Enlightenment era. It can also refer to personal behavior, such as conducting oneself with dignity.

Embarrassment: Embarrassment is an emotional state that occurs when someone does something socially unacceptable or frowned upon in front of others. It is closely related to shame and guilt and can greatly affect a person's thoughts and behavior.

Empathy: Empathy is the capacity to comprehend, feel, and potentially share and respond to someone else's perspective and experiences. It encompasses social, cognitive, and emotional processes aimed at understanding others. The concept can be further categorized into types like cognitive, emotional, somatic, and spiritual empathy.

Forgiveness: Forgiveness is the intentional and voluntary process of changing feelings and attitudes towards someone who caused harm. It involves overcoming negative emotions such as resentment and a desire for revenge. The extent of forgiveness varies among theorists, with some believing it includes replacing negative emotions with positive attitudes and reconciling with the offender. In legal contexts, forgiveness involves absolving someone of debt or other claims.

Honour: Honour is a quality that combines social teachings and personal ethics, expressed through a code of conduct. It includes valour, chivalry, honesty, and compassion. It is an abstract concept that affects a person's social standing and self-evaluation, as well as institutions like families, schools, and nations. It determines worth and stature based on individuals adhering to specific codes of honour and societal moral values.

Jealousy: Jealousy is the mental state of feeling insecure and fearful due to a perceived lack of possessions or safety.

Lie: A lie is a false assertion used to deceive or mislead someone, with the act of lying being the practice of communicating lies. Those who lie are called liars. Lies can be deliberately false or misleading statements, serving various purposes for individuals.

Prejudice: Prejudice is an affective feeling towards a person based on their group membership. It involves preconceived evaluations or classifications based on personal characteristics like political affiliation, gender, age, religion, race, ethnicity, nationality, and more.

Privacy: 'Privacy' refers to an individual or group's capacity to hide personal information and decide when and how to reveal it, allowing for selective self-expression and seclusion.

Punishment: Punishment refers to the imposition of unpleasant consequences on individuals or groups by authorities as a response and deterrent to undesirable behavior. It spans a wide range of contexts, from child discipline to criminal law. The concept of punishment is multifaceted and encompasses various understandings.

Remorse: Remorse is a distressing emotion felt by someone who regrets their past actions, considering them shameful or hurtful. It is similar to guilt and self-directed resentment. People express remorse through apologies, trying to make amends, or punishing themselves. It can arise from facing consequences or regretting inaction.

Respect: Respect is an emotion or action demonstrating admiration and high regard for someone or something. It involves honoring others by showing care, concern, and consideration for their needs and feelings.

Shame: Shame is a self-conscious emotion linked to negative self-evaluation, motivation to quit, and feelings of pain, exposure, distrust, powerlessness, and worthlessness.

Shyness: Shyness is the feeling of discomfort or awkwardness around others, particularly in new or unfamiliar situations. Shy individuals may avoid such situations due to fear of negative reactions and worry about how others perceive their behavior. In severe cases, shyness can escalate into social anxiety or social phobia.

Trust (social science): Trust in social science refers to believing that someone will fulfill their expected obligations. It involves vulnerability and the expectation that the other person will act in a beneficial way. The trustor lacks control over the trustee's actions. There are two types of trust: generalized (extends to unfamiliar others) and particularized (relies on specific situations or relationships).

Society: A society is a collection of individuals who interact socially within a shared territory under the same political authority. It is defined by the relationships, culture, and institutions that exist among its members.

Civil society: Civil society refers to the third sector of society, separate from the government and business, which encompasses the family, private sphere, non-governmental organizations, and institutions. It involves individuals and organizations that operate independently from the government, working for the benefit and will of citizens.

Institution: An institution is a created system of rules and norms that govern how individuals behave. It involves persistence and continuity. Laws, rules, social conventions, and norms are examples of institutions that can be formal or informal.

Public: Public refers to groups of individuals, while the term "publics" in public relations represents these groupings collectively. This concept differs from the sociological notion of the public sphere. Political science, psychology, marketing, and advertising also define and discuss the concept of a public. However, its definition in public relations and communication science can be unclear due to its conflation with audience, market segment, community, constituency, and stakeholder.

Social norm: Social norms are shared standards of acceptable behavior that apply to groups. They can be informal understandings or formal rules and laws. These norms heavily influence human behavior and are well incorporated into theories explaining human behavior. Norms are distinct from private beliefs and values, and they vary depending on context, social group, and historical circumstances. They are crucial components of institutions.

Social order: Social order refers to both a specific system of social structures and institutions, such as ancient or capitalist order, and a stable state of society where the existing social structure is accepted and maintained by its members. It addresses the problem of order, which is the question of how and why social orders exist, and is a central concern in sociology, political science, and political philosophy.

Solidarity: Solidarity is the sense of unity among groups or classes, based on shared interests, objectives, and standards. It acknowledges individuals as the foundation of society and emphasizes the bonds that bind people together. It is widely studied in sociology, social sciences, philosophy, and bioethics. Additionally, solidarity holds importance in Catholic social teaching and Christian democratic political ideology.

Community: A community is a social unit characterized by shared characteristics like place, norms, culture, religion, values, or identity. They can exist in physical or virtual spaces. Communities are defined by strong relationships beyond family ties, influencing their identity and roles in social institutions. They can be small or large, including national, international, and virtual groups.

Organization: An organization is a group of people with a specific purpose, such as a company or institution. It consists of one or more individuals working together towards achieving their goals.

Club (organization): A club is an organization of people with a shared interest or goal. It can range from charity and hobby clubs to social, political, and religious clubs.

Non-governmental organization: A Non-governmental organization (NGO) is an independent, nonprofit entity engaged in humanitarian or social science activities. They can provide services to members and others, and also serve as lobby groups for corporations. NGOs are different from international and intergovernmental organizations, as they are not directly involved with sovereign states and governments.

Nonprofit organization: A nonprofit organization, also known as a non-profit, is a legal entity operated for the collective, public, or social benefit rather than for profit. Revenues exceeding expenses must be used for the organization's purpose rather than for private gain. Nonprofits encompass a wide range of entities, such as political organizations, schools, churches, and social clubs. They may seek tax-exempt status and qualify to receive tax-deductible contributions, but can incorporate as nonprofits even without tax-exempt status.

Secret society: A secret society is a concealed organization with hidden activities, events, inner workings, or membership. It may or may not try to hide its existence, but excludes covert groups like intelligence agencies or guerrilla warfare insurgencies that maintain a public presence while hiding their activities and memberships.

Support group: A support group is formed by individuals facing similar challenges. They offer one another nonprofessional support and share coping strategies. The group aims to empower its members and create a sense of community. Help is provided through information exchange, sharing personal experiences, and establishing social networks. Support groups may also engage in public awareness and advocacy efforts.

Trade union: A trade union, also known as a labor union or simply a union, is an organization of workers aiming to enhance their employment conditions. This includes improving wages, benefits, working conditions, and safety standards. Additionally, trade unions establish procedures to address grievances, create rules regarding employee status, and protect and strengthen workers' bargaining power.

Tribe: The term tribe refers to a social group found in various contexts. In anthropology, it is primarily used and debated, due to conflicting theories and applications. Anthropologists compare tribes to other social and kinship groups, noting their intermediate size. Tribes can have legal recognition and political autonomy, although this may contradict anthropological definitions.

Voluntary association: A voluntary association is a group of individuals who come together, often as volunteers, for a common purpose. Examples include trade unions, professional associations, and environmental groups.

Social network: A social network is a group of individuals connected through relationships and interactions. It involves analyzing the structure and patterns within these networks using social network analysis. This helps identify influential entities, study network dynamics, and understand local and global patterns in social structures.

Emergency management: Emergency management is a function that helps communities reduce vulnerability to hazards and cope with disasters. It focuses on managing disasters rather than minor emergencies. Activities include preparedness, response, mitigation, and recovery, aiming to prevent or reduce harmful impacts of disasters.

Firefighting: Firefighting is the profession of controlling and extinguishing fires. Firefighters receive extensive technical training in areas such as structural and wildland firefighting. They also specialize in various types of firefighting such as aircraft, shipboard, aerial, maritime, and proximity firefighting.

Orphanage: Orphanage - A residential institution for orphaned or abandoned children who cannot be cared for by their biological families due to various reasons. Parents may be deceased, absent, abusive, or unwilling to care for the child. Government-run orphanages have been reduced in developed countries but still exist in other regions. It is widely recognized that orphanages can harm children's emotional wellbeing, and efforts now go towards supporting the family unit.

Prison: A prison, also known as jail, is a state-run facility where individuals are confined against their will as punishment for crimes. It restricts their freedom and is commonly used within the criminal justice system. People awaiting trial or convicted of crimes may be imprisoned for a specified period.

Social work: Social work is an academic discipline and profession aimed at improving the well-being of individuals, families, groups, communities, and society at large. It integrates various fields like psychology, sociology, and economics to address social issues, develop interventions, and promote social responsibility. Core objectives include improving lives, addressing biopsychosocial concerns, empowering individuals and communities, and striving for social justice.

Social issue: A social issue refers to a widespread problem affecting society that people strive to solve. It arises from factors beyond individual control and leads to conflicting opinions on what is morally right or wrong. While distinct from economic issues, some problems have social and economic dimensions. Warfare is an example of an issue that does not fall into either category.

Abortion: Abortion is the deliberate ending of a pregnancy by removing the embryo or fetus. Miscarriage, or spontaneous abortion, occurs naturally in about 30% to 40% of pregnancies. When steps are taken to end a pregnancy, it is called induced abortion. The most common reasons for having an abortion are birth-timing and limiting family size. Other reasons include maternal health, financial constraints, domestic violence, lack of support, young age, education or career plans, and unwanted pregnancies resulting from rape or incest.

Animal welfare: Animal welfare refers to the well-being of non-human animals. It involves different standards that vary depending on the context, often debated by animal welfare groups, legislators, and academics. The assessment of animal welfare involves factors like longevity, disease, behavior, physiology, and reproduction, although the best indicators are still a matter of debate.

Child labour: Child labour is the exploitation of children through work that harms their childhood, education, and well-being. It is globally prohibited, although certain exceptions exist for child artists, family responsibilities, supervised training, Amish children, and Indigenous children in the Americas.

Corruption: Corruption is dishonesty or a criminal offense committed by individuals or organizations in positions of power, aiming to gain illicit benefits or abuse authority for personal gain. It involves activities like bribery, influence peddling, and embezzlement, some of which may be legal in certain countries. Political corruption occurs when government employees exploit their positions for personal profit. Most prevalent in kleptocracies, oligarchies, narco-states, and mafia states.

Deforestation: Deforestation refers to the removal of forests or trees from land to make way for non-forest purposes like agriculture or urbanization. Tropical rainforests experience the highest levels of deforestation. Currently, only 31% of Earth's land surface is covered by forests, which is one-third less than before agriculture expansion. Approximately 15 to 18 million hectares of forest, equivalent to the size of Bangladesh, are lost annually. Shockingly, around 2,400 trees are cut down per minute on average.

Disability: Disability refers to any condition that hinders a person's ability to perform certain activities or have equal access in society. It can be cognitive, developmental, intellectual, mental, physical, sensory, or a combination of factors, and can be present from birth or acquired later in life. Disabilities are not binary and can vary in unique characteristics for each individual. They can be visible or invisible in nature.

Environmentalism: Environmentalism is a philosophy and movement that supports the protection of life and habitats. It focuses on nature-related aspects of green ideology and politics. Ecologism, a term more used in continental Europe, combines social ecology and environmentalism. While environmentalism is more common in English, both words have slightly different connotations.

Euthanasia: Euthanasia is intentionally ending life to relieve pain and suffering.

Famine: A famine is a severe shortage of food due to reasons like war, natural disasters, or government policies. It leads to malnutrition, starvation, epidemics, and higher mortality rates. Famine has occurred on every inhabited continent throughout history. In the 19th and 20th centuries, Southeast and South Asia, Eastern and Central Europe suffered the most fatalities. However, famine deaths have decreased significantly since the 1970s. Africa has been the most affected continent by famine since 2010.

Homelessness: Homelessness refers to the condition of lacking stable, safe, and functional housing. It includes living on the streets, moving between temporary shelters, residing in boarding houses without basic amenities, and not having access to permanent or secure housing. Internally displaced persons who flee civil conflict and become refugees within their country are also considered homeless.

Human migration: Human migration involves the movement of people to new places, whether for permanent or temporary settlement.

Immigration: Immigration refers to the movement of people to a country where they are not usual residents or lack nationality, for the purpose of becoming permanent residents. It excludes short-term stays and tourism, but may include seasonal labor immigration.

Human overpopulation: Human overpopulation refers to the worry that human populations may grow to a size that exceeds the capacity of the environment or available resources to support them. This issue is typically discussed in relation to global population, but it can also pertain to countries, areas, or cities.

One-child policy: The one-child policy in China, implemented from 1979 to 2015, aimed to control population growth by allowing only one child per family. It had significant social, cultural, economic, and demographic impacts. The effectiveness of birth rate reduction and ethical concerns surrounding human rights remain controversial.

Humanitarianism: Humanitarianism is the active belief in the value of human life, involving benevolent treatment and assistance to reduce suffering and improve humanity's condition. It encompasses emergency aid, human rights advocacy, government actions, development assistance, and philanthropy. It raises critical issues such as religious beliefs, motivations for aid, market affinity, imperialism, gender and class relations, and the role of humanitarian agencies. A practitioner of humanitarianism is called a humanitarian.

Pacifism: Pacifism, coined by Émile Arnaud in 1901, is the opposition to war, militarism, and violence. It is closely associated with the concept of ahimsa found in Indian religions. While its modern connotations started in the 19th century, ancient references also exist.

Peace: 'Peace' refers to societal friendship and harmony, characterized by the absence of hostility and violence. It signifies a state of societal tranquility, absence of conflict, and freedom from fear of violence among individuals or groups.

World peace: World peace envisions a state of harmony among all individuals and nations worldwide. It is an ideal concept embraced by diverse cultures, religions, philosophies, and organizations, each offering different perspectives on achieving this state.

Pollution: Pollution occurs when contaminants are introduced into nature, resulting in harmful alterations. It can involve various substances or energy sources, including both artificial and natural pollutants.

Air pollution: Air pollution is the presence of harmful substances in the air, both indoors and outdoors, that can cause health issues and damage the environment. It includes various types of pollutants, such as gases, particles, and biological agents. It can lead to diseases, allergies, and even death for humans and harm animals, crops, and natural/built environments. Air pollution can be caused by human activities and natural events.

Water pollution: Water pollution refers to the contamination of water bodies by harmful substances, caused mostly by human activities. Sources include sewage, industry, agriculture, and urban runoff. It affects lakes, rivers, oceans, reservoirs, aquifers, and groundwater. This pollution degrades aquatic ecosystems, spreads water-borne diseases, and diminishes the services these water resources offer.

Population ageing: Population ageing is the increasing median age in a population due to declining fertility rates and longer life expectancy. This trend is present in most countries, including developing nations. Only 18 countries are exceptions to this global phenomenon. The aged population is currently at its highest level in history, with projections indicating a further increase. The UN predicts that the rate of population ageing in the 21st century will surpass that of the previous century. The number of individuals aged 60 and above has tripled since 1950 and is expected to reach 2.1 billion by 2050. Different countries are experiencing varying degrees and pace of ageing, with implications that require adaptation.

Poverty: Poverty is a state of lacking financial resources and essentials for a particular standard of living. It can result from various social, economic, and political factors. Absolute poverty measures income against basic needs, while relative poverty compares living standards among individuals in a specific time and place. Variations in the definition of relative poverty exist among countries and societies.

Social movement: A social movement is a large, loosely organized group of people working towards a common social or political goal. It aims to bring about social change or counter existing changes. Social movements can empower oppressed populations to challenge and resist those in power. They can be driven by individuals or organizations. However, some social movements seek to maintain or amplify existing power structures, like fascism.

Sustainable development: Sustainable development is an approach that aims to meet human needs without harming the natural environment. It seeks to find a balance between economic growth, environmental protection, and social well-being. The concept, defined in the Brundtland Report of 1987, emphasizes meeting the needs of the present generation without compromising the ability of future generations to meet their own needs. Today, sustainable development focuses on economic, social, and environmental aspects for the well-being of future generations.

Violence: Violence is the application of physical force to cause harm to individuals, animals, or property, resulting in pain, injury, death, damage, or destruction. It involves the intentional use of force or power, whether threatened or actual, against oneself, others, or a group/community, with a high likelihood of resulting in various forms of harm such as injury, death, psychological damage, maldevelopment, or deprivation.

Economic inequality: Economic inequality refers to unequal distribution of income, wealth, and consumption. It can be measured within or between nations and sub-populations.

Feminism: Feminism is a movement aiming to establish gender equality in politics, economics, and society. It recognizes that societies favor men and seeks to challenge gender stereotypes, improve education and professional opportunities, and address unjust treatment of women.

Gender equality: Gender equality, also called sexual equality, is the fair distribution of resources and opportunities independent of gender. It encompasses equal participation in the economy and decision-making. Moreover, it involves acknowledging and valuing diverse behaviors, aspirations, and needs irrespective of gender.

Women's rights: Women's rights are the rights and entitlements that women and girls worldwide claim. These rights were the foundation of the women's rights movement in the 19th century and feminist movements in the 20th and 21st centuries. They vary in enforcement and support across countries, with some countries institutionalizing and others suppressing these rights. Unlike broader notions of human rights, women's rights address a historical bias favoring men and boys in the exercise of rights.

Human rights: Human rights are moral principles protected by laws that apply universally to all people, regardless of their characteristics. They encompass fundamental rights inherent to all individuals, emphasizing equality and empathy. Upheld by the rule of law, they should only be infringed upon through a fair legal process.

Liberty: Liberty is the freedom individuals enjoy in society, where they are not burdened by authoritarian rules that limit their way of life, actions, or political opinions.

Social equality: Social equality refers to a societal condition where all individuals enjoy equal rights, freedoms, and status. This encompasses civil rights, freedom of expression, autonomy, and fair access to public goods and social services.

Minority group: A minority group refers to a smaller segment within a population. Typically, these groups have fewer people compared to the majority. They often lack power and influence compared to the larger group. The term can be applied in various contexts.

Political freedom: Political freedom is a crucial aspect in history and political thought, particularly in democratic societies. It encompasses the absence of oppression or coercion, the fulfillment of enabling conditions, and freedom from external and internal constraints on action. It involves the exercise of rights, capacities, and possibilities for action, as well as the protection of civil liberties and human rights by the state.

Race (human categorization): Race is a human categorization based on shared physical or social qualities within a society. It originated in the 16th century to refer to different kinds of groups and later encompassed physical traits and national affiliations. Modern science views race as a socially constructed identity, lacking inherent physical or biological significance. The concept of race is closely linked to racism, the belief in the superiority of one race over others.

Social stratification: Social stratification is the system where people are divided into groups based on factors like wealth, income, race, education, ethnicity, gender, occupation, social status, or power. It determines the relative social position of individuals in different categories or units within a society.

Slavery: Slavery is the ownership of a person as property for labor, with the slave's work and living arrangements controlled by the owner. Enslavement refers to the act of placing an individual into slavery, making them a slave or an enslaved person.

Caste: A caste is a social group someone is born into within a system of social hierarchy. Individuals are expected to marry within their caste, follow occupation-linked lifestyles, hold ritual rankings, and interact based on exclusionary cultural beliefs. The caste system is exemplified by India's division into rigid social groups, rooted in ancient history. While still present, its economic significance has declined due to urbanization and affirmative action. Sociologists and anthropologists study the Hindu caste system, which is also used as a basis for studying caste-like divisions outside Hinduism and India. The term "caste" also applies to social groupings in certain insects.

Caste system in India: The caste system in India is a social classification based on castes that originated in ancient India. It has evolved over time under different rulers, particularly after the collapse of the Mughal Empire and the establishment of the British Raj. Today, it serves as the basis for affirmative action programs enforced by the Indian constitution. The system comprises two key concepts, varna and jati, which offer different perspectives on its structure.

Social class: Social class refers to the division of people into hierarchical categories such as upper, middle, and lower classes. It is determined based on factors like education, wealth, occupation, income, and affiliation with specific subcultures or social networks.

Clergy: Clergy are leaders of established religions, overseeing rituals and teaching doctrines. They are known as clergyman, clergywoman, clergyperson, churchman, ecclesiastic, or cleric. The term clerk in holy orders has historical usage but is now uncommon.

Eunuch: A eunuch is a castrated male. Historically, castration had social implications.

Upper class: The upper class comprises the wealthiest and most influential individuals in society, holding high social status and significant political power. This class is characterized by immense inherited wealth, and in the past, aristocracy emphasized inherited noble status rather than just recent wealth.

Middle class: The middle class is a social group positioned between the highest and lowest in society, often characterized by their occupation, income, education, or social status. It is historically associated with modernity, capitalism, and political discussions. Defining the middle class can vary, from the middle fifth of income earners to excluding only the poorest and wealthiest 20%. Theories like the "Paradox of Interest" analyze wealth distribution and decile groups to assess the size and wealth share of the middle class.

Working class: The working class consists of employees who receive wages or salaries. They typically work in blue-collar and pink-collar occupations. They rely solely on income from their job and can encompass most of the workforce in industrialized economies and urban areas in non-industrialized or rural economies.

Underclass: The underclass refers to the most disadvantaged group in the class hierarchy, positioned below the working class.

Peasant: A peasant refers to a pre-industrial agricultural laborer or farmer during the Middle Ages in Europe. They typically had limited land ownership and paid rent, taxes, fees, or services to a landlord. Peasants can be classified into three categories: non-free slaves, semi-free serfs, and free tenants. They held land through various forms of land tenure such as socage, quit-rent, leasehold, or copyhold.

Discrimination: Discrimination refers to the unfair treatment of individuals based on their group membership or perceived characteristics, such as race, gender, age, religion, appearance, or sexual orientation. This prejudice often results in depriving one group of opportunities and privileges enjoyed by another group.

Class discrimination: Class discrimination, or classism, refers to prejudiced or discriminatory treatment based on social class. It encompasses biased attitudes, behaviors, and policies favoring the upper class while disadvantaging the lower class.

Genocide denial: Genocide denial is the act of downplaying or denying the extent and seriousness of a genocide. It involves efforts to hide evidence and spread propaganda during the genocide. Denial is considered a strong indicator of future genocidal acts, according to genocide researcher Gregory Stanton.

Homophobia: Homophobia is the term for negative attitudes and feelings towards homosexuality, including contempt, prejudice, aversion, hatred, and antipathy. It can stem from irrational fear and is sometimes influenced by religious beliefs.

Racism: Racism is discrimination and prejudice against people based on their race or ethnicity. It can be found in social actions, practices, or political systems that support discrimination. Racist ideology assumes distinct groups that can be ranked as superior or inferior. It can manifest in various aspects of social life, including nativism, xenophobia, segregation, and supremacism.

Sexism: Sexism is prejudice or discrimination based on sex/gender, primarily affecting women/girls. It involves beliefs in superiority, fosters sexual violence, and leads to workplace inequality. It stems from societal customs/norms.

Sociology: Sociology is the scientific study of human society, focusing on social behavior, relationships, interaction, and culture. It is a part of social sciences and humanities, using empirical investigation and critical analysis to understand social order and change. It analyzes individual interactions and societal structures and can be applied to social policy and welfare. Moreover, sociological research examines social processes and uses phenomenological methods to gain a deep understanding.

Criminology: Criminology is the study of crime and deviant behavior, drawing on various disciplines such as sociology, psychology, law, and anthropology. It examines the administration of justice and the criminal justice system.

Demography: Demography is the study of human populations, focusing on their size, characteristics, and dynamics, including birth rates, death rates, and migration patterns.

Census: A census is a systematic procedure to gather population information about individuals in a given area. It is commonly used for national population and housing statistics but can also include other types such as agriculture, culture, business, supplies, and traffic censuses. The United Nations recommends that population censuses be conducted at least every ten years, with key features like individual enumeration, universality within a defined territory, simultaneity, and defined periodicity. UN guidelines also provide recommendations for census topics, official definitions, classifications, and international coordination.

Etiquette: Etiquette refers to the expected and accepted social behaviors in polite society. It encompasses a set of norms and an ethical code that aligns with the conventions and practices of a particular society, social class, or social group. The term "etiquette" originated from the French word "étiquette" in 1750.

Generation: A generation refers to people born and living at the same time. It represents a 20-30 year period when children grow up, become adults, and start having children. In kinship, it signifies the parent-child relationship and is related to biogenesis, reproduction, or procreation in biology.

Nature versus nurture: Nature versus nurture is a debate regarding the impact of genetic inheritance (nature) and environmental conditions (nurture) on human development. The concept has a long history, dating back to medieval French. "Nature" refers to pre-wiring influenced by genetics, while "nurture" represents the influence of external factors such as exposure, experience, and learning after conception.

Peer pressure: Peer pressure is the influence peers have on each other in terms of beliefs, values, and behavior. It can be both positive and negative, as individuals may feel encouraged to conform to the attitudes and actions of their social group.

Power (social and political): Power, in social science and politics, refers to the ability to influence and control the capacities, actions, beliefs, or conduct of individuals. It goes beyond force and coercion and can be exerted through various means, including social structures and discursive elements.

Social change: Social change refers to the modification of a society's social order, encompassing alterations in institutions, behaviors, and relationships. When persistent on a larger scale, it can result in societal transformation.

Social control: Social control refers to the regulation of behavior in society through rules and standards. It involves the use of formalized mechanisms to keep individuals adhering to conventional norms. In sociology, the concept of social control contrasts with Foucault's disciplinary model but builds upon it.

Deviance (sociology): Deviance in sociology refers to actions that go against social norms, including both formal rules and informal behaviors. It encompasses negative and positive deviations from these norms. Even when a norm is violated, a behavior can still be considered positive or acceptable.

Social group: A social group is a collection of individuals who interact, share similarities, and feel a sense of unity. They come in various sizes and types, with societies being considered large social groups. The interactions and psychological processes within or between social groups are known as group dynamics.

Identity (social science): Identity refers to the distinguishing qualities, beliefs, traits, appearance, and expressions that define an individual or a collective. It encompasses various aspects that shape and characterize a person or a group.

Social reality: Social reality is a level of reality shaped by social interaction rather than biological or individual cognition. It transcends individual motives and actions and is formed through human dialogue. It consists of accepted social norms and stable laws within a community. Social reality is seen as the outcome of shared perspectives among observers.

Social research: Social research is systematic research conducted by social scientists. It can be classified into quantitative and qualitative methodologies. Quantitative designs rely on statistical analysis of many cases to create general claims, while qualitative designs focus on understanding social phenomena through direct observation, communication, and analysis of texts, emphasizing subjective accuracy.

Social theory: Social theory refers to analytical frameworks used by social scientists to study social phenomena. These theories help interpret historical debates and determine the reliability of different methodologies. They also examine the balance between structure and agency and the relationship between contingency and necessity. Informal social theory may be referred to as social criticism or commentary, often associated with cultural and literary scholarship, as well as journalistic forms of writing.

Socialization: Socialization, a sociological concept, involves internalizing societal norms and beliefs. It encompasses learning and teaching, serving as a means for cultural and social continuity attainment.

Sociological theory: Sociological theory is an approach that studies and interprets social phenomena by examining connections between various concepts. It aims to organize and substantiate sociological knowledge through complex theoretical frameworks and methodology.

Structure and agency: The term 'Structure and agency' refers to the ongoing debate in social sciences about the extent to which individuals are influenced by their social environment (structure) or have the ability to make independent choices (agency). Structure refers to the recurring patterns that impact choices, while agency represents the capacity of individuals to act freely. This debate revolves around determining whether individuals behave as autonomous agents or are primarily shaped by socialization.

Subculture: A subculture is a distinct group within a society that separates itself from mainstream values, embracing its own norms and values especially regarding culture, politics, and sexuality. Examples of subcultures include BDSM, hippies, goths, and punk. The concept of subcultures originated in sociology and cultural studies, and they are distinct from countercultures.

Money: Money is a widely accepted means of payment and debt repayment. It serves as a medium of exchange, unit of account, store of value, and occasionally as a standard for delayed payments.

Currency: Currency is a standardized form of money used as a medium of exchange, such as banknotes and coins. It is a system of money used within a specific environment over time. Examples include British Pound sterling (£), euros (€), Japanese yen (¥), and U.S. dollars (US$). Currencies can be traded between nations in foreign exchange markets and act as stores of value. They are chosen by users or decreed by governments, often with limited boundaries of acceptance. Legal tender laws may require specific units of account for payments to government agencies.

Banknote: A banknote, also known as a bill or paper money, is a type of negotiable promissory note issued by a bank or licensed authority. It is payable to the bearer upon demand. Originally, commercial banks issued banknotes, which were redeemable for legal tender. However, national banknotes issued by central banks have replaced commercial banknotes in most cases.

Coin: A coin is a small round object used as a medium of exchange. It is standardized in weight and produced in large quantities at a mint by a government. Coins often have images, numerals, or text on them. The front side is known as the obverse, commonly depicting a prominent person's head, while the back side is called the reverse or tails.

Exchange rate: An exchange rate is the rate at which currencies are exchanged. It determines the value of one currency in terms of another. This can be national currencies like the euro or sub-national currencies like Hong Kong dollar.

Euro: The euro, the official currency of the eurozone, is used in 20 European Union member states. With approximately 344 million citizens, it is divided into 100 euro cents.

Japanese yen: The Japanese yen is Japan's official currency and is third-most traded in the forex market, following the US dollar and the euro. It is also widely used as a third reserve currency.

Pound sterling: Pound sterling is the currency of the United Kingdom and its territories, with "pound" commonly used to refer to the British currency. It is also known as the British pound or the pound sterling internationally.

Renminbi: The renminbi (RMB) is China's official currency and the world's 5th most traded currency as of April 2022.

United States dollar: The US dollar is the official currency of the United States and other countries. It was established in 1792 and divided into 100 cents. US banknotes, known as greenbacks due to their green color, are issued as Federal Reserve Notes.

Bank: A bank is a financial institution that accepts public deposits, creates demand deposits, and grants loans directly or indirectly through capital markets.

Cheque: A cheque is a document that instructs a bank to pay a specified amount of money from the issuer's account to the named recipient. The issuer, known as the drawer, writes the amount, date, payee's name, and signs the cheque. The bank, called the drawee, is obligated to pay the stated amount to the payee.

Debit card: A debit card is a payment card that can be used instead of cash for purchases. It typically includes the bank's name, card number, cardholder's name, and expiration date. The card can be used by inserting it and entering a PIN or by contactless payment. Unlike a credit card, the purchase amount is immediately deducted from the cardholder's bank account.

Finance: Finance is the discipline that studies money, currency, and capital assets. It is distinct from economics but connected through financial economics. The field encompasses personal, corporate, and public finance within financial systems.

Interest: Interest is a payment made by a borrower to a lender that exceeds the amount borrowed, calculated at a set rate. It is different from fees and dividends, as it is predetermined and not based on profits or reserves.

Investment: Investment is the commitment of resources to obtain future benefits. It can specifically involve money being committed to generate more money later. Investments are made to optimize the flow of resources and expenses. Cash flow refers to the net monetary receipt within a specific time period, while a series of time periods with received money is called a cash flow stream.

Accounting: Accounting, or accountancy, involves processing information about businesses and corporations. It measures economic activities and communicates results to investors, creditors, management, and regulators. Accountants are the practitioners, and accounting and financial reporting are sometimes used interchangeably.

Insurance: Insurance is a financial safeguard where one party compensates another party for specific losses, damages, or injuries in exchange for a fee. It is a risk management tool that provides protection against uncertain or contingent losses.

Debt: Debt refers to the obligation of one party, the debtor, to repay money borrowed from another party, the creditor. It can be owed by nations, governments, companies, or individuals. Commercial debt follows specific repayment terms, and various financial instruments such as loans, bonds, notes, and mortgages represent different types of debt. In finance, debt is a distinct financial transaction when contrasted with equity.

Credit card: A credit card is a payment card that allows users to make purchases, withdraw cash, and accumulate debt, which must be repaid later. It is widely used globally and typically issued by banks.

Loan: A loan is the lending of money from one party to another, typically with interest, creating a debt that must be repaid.

Mortgage: A mortgage is a loan secured by real property, used by buyers to purchase real estate or by existing property owners to raise funds for any purpose. It involves the lender putting a lien on the property, allowing them to sell it if the borrower defaults on the loan. The term "mortgage" comes from an old British term meaning "death pledge," referring to the pledge ending when the obligation is fulfilled or the property is foreclosed. Essentially, it is a collateral given by the borrower to receive a loan.

Derivative (finance): A financial derivative is a contract tied to the performance of an underlying asset, index, or interest rate. Its main purposes include hedging against price movements, speculating on price changes, and gaining access to difficult-to-trade assets or markets.

Stock: Stocks represent ownership shares in a corporation, dividing ownership among shareholders. Owning a single share gives a fraction of ownership and entitlements to earnings, assets' liquidation, or voting power, based on the amount invested. Different classes of stock exist, varying in voting rights and priority to receive profits or liquidation proceeds.

Stock exchange: A stock exchange is a market where traders buy and sell securities such as stocks and bonds. It also facilitates the issuance and redemption of these financial instruments and organizes capital events like income and dividends. Stock exchanges function as continuous auction markets, where transactions occur through open outcry or electronic trading platforms. Various securities, including stocks, unit trusts, derivatives, and bonds, are traded on these exchanges.

New York Stock Exchange: The New York Stock Exchange (NYSE) is the world's largest stock exchange located in Lower Manhattan, New York City.

Bankruptcy: Bankruptcy is a legal process allowing individuals or entities in debt to seek relief from some or all of their debts. It is typically initiated by the debtor through a court order.

Business: Business is the act of earning a living or generating profit through the production and sale of goods or services. It encompasses any profit-driven activity or venture.

Capital (economics): Capital (economics) refers to durable goods used as inputs for further production. This includes machinery in factories and other assets such as buildings, equipment, software, and inventories. Capital is a key factor in economic growth and plays a crucial role in the production of goods and services.

E-commerce: E-commerce is the buying and selling of products online, utilizing technologies like mobile commerce, electronic funds transfer, and Internet marketing. It encompasses supply chain management, online transaction processing, and automated data collection systems. Being the largest sector of the electronics industry, it is strongly influenced by advancements in the semiconductor industry.

Logistics: Logistics is the management of the efficient flow of goods, services, and information from origin to consumption, meeting customer needs. It encompasses supply chain management, coordinating tangible goods like materials and equipment, as well as consumables.

Management: Management is the administration of organizations, including businesses, nonprofits, and government bodies. It involves overseeing resources and applying business, nonprofit, or public administration principles to ensure effective operations.

Monopoly: A monopoly is a market where only one person or enterprise supplies a specific thing. Unlike a monopsony, which is control of a market to buy goods, or an oligopoly/duopoly, which is dominated by a few sellers, a monopoly lacks economic competition and substitute goods. It can charge a high price and gain high profits, leading to a decrease in social surplus. Monopolies gain the ability to raise prices and exclude competitors. Size is not a characteristic of a monopoly; even small businesses can have the power to raise prices in a small industry.

Pension: A pension is a fund where individuals contribute regularly during their working career to support their retirement. There are two types: defined benefit plans, where periodic payments are made in retirement with additional contributions from the sponsor if needed, and defined contribution plans, where individuals make regular payments during their working life and receive retirement payments based on the fund's value.

Perfect competition: Perfect competition is a term used in economics to describe an ideal market where specific conditions are met for optimal competition. This includes equal supply and demand at the current price, resulting in an equilibrium known as a Pareto optimum.

Productivity: Productivity refers to the efficiency of producing goods or services, usually measured as a ratio of output to input over a specific period. One common example is labor productivity, such as GDP per worker. Various definitions exist depending on the purpose and available data. Differences in productivity measures usually stem from how outputs and inputs are aggregated.

Property: Property refers to a system of rights granting legal control over valuable things. Owners have the freedom to use, alter, share, rent, sell, or destroy their property, or to exclude others from doing so. These rights are granted by law and enable owners to properly utilize their property.

Real estate: Real estate refers to land, buildings, natural resources, and the ownership rights associated with them. It distinguishes from personal property and encompasses one's interest in land.

Trade: Trade is the exchange of goods and services between individuals or entities, commonly involving money. Economists define trade as a market system or network that facilitates this exchange.

International trade: International trade is the global exchange of capital, goods, and services due to demand or desire for products from different countries or regions.

Protectionism: Protectionism is an economic policy that limits imports using tactics like tariffs and quotas. Supporters believe it protects local industries and generates revenue for the government. Critics argue that it hinders trade, hurts consumers, and impacts export sectors in both the implementing and targeted countries.

Company: A company is a legal entity where individuals or organizations come together with a specific objective. Members of a company share a common purpose and work towards specific goals. Companies can take different forms like voluntary associations, business entities, financial entities, or educational institutions. The main aims of companies are generating sales, revenue, profit, or serving a non-profit cause.

Corporation: A corporation is a legal entity authorized by the state that acts as a single organization. It can be created through registration and is classified based on its ability to issue stock and make a profit. Corporations can have multiple owners or be owned by a single person.

Multinational corporation: A multinational corporation (MNC) is a company that produces goods or services in at least one country other than its home country. Control over production is a distinguishing aspect of MNCs. They are also known as multinational enterprises or transnational corporations. MNCs generate significant revenue from operations outside their home country.

Partnership: A partnership is a cooperative arrangement where individuals, businesses, or organizations join forces to pursue shared interests and goals. It can involve issuing equity or be solely governed by a contract. Partnerships are formed to enhance the likelihood of success and broaden their impact.

Agriculture: Agriculture comprises crop and livestock production, aquaculture, fisheries, and forestry for food and non-food products. It played a vital role in the development of settled human societies by creating food surpluses through farming domesticated species. Grain gathering began 105,000 years ago, while farming started around 11,500 years ago. Domestication of animals like sheep, goats, pigs, and cattle occurred 10,000 years ago. Cultivation of plants took place independently in at least 11 regions. Industrial agriculture with large-scale monocultures became dominant in the 20th century.

Construction: Construction is the process of creating objects, systems, or organizations. It involves building and the structure of something. The term comes from Latin and Old French, and refers to the art and science of forming.

Energy industry: The energy industry encompasses all activities related to energy production, distribution, and sales. It includes fuel extraction, manufacturing, refining, and distribution. This industry plays a vital role in maintaining and supporting modern societies worldwide, as it satisfies the substantial energy demands needed for their functionality.

Fishing industry: The fishing industry encompasses all activities related to fish harvesting, processing, and selling. This includes recreational, subsistence, and commercial fishing, as well as the associated sectors like processing and marketing. Over 500 million people in developing countries rely on fisheries and aquaculture for their livelihood.

Forestry: Forestry is the science of managing and preserving forests for human and environmental benefits. It includes creating, planting, conserving, and repairing forests as well as managing both plantations and natural stands. Forest management affects habitats and ecosystem services.

Fur trade: The fur trade is a global industry that involves the buying and selling of animal fur. It has been particularly focused on furs from boreal, polar, and cold temperate mammals. This trade played a crucial role in the exploration and colonization of Siberia, northern North America, and the South Shetland and South Sandwich Islands.

Hunting: Hunting is the practice of pursuing and capturing wildlife for various reasons. It is commonly done for obtaining food and useful animal products, as well as for recreational purposes like taxidermy. Hunting can also serve non-exploitative purposes such as eliminating dangerous predators, controlling pests that harm crops and spread diseases, and contributing to ecological conservation against overpopulation and invasive species.

Fishing: Fishing is the act of catching fish, either from natural habitats or stocked waters. It involves various techniques like hand-gathering, spearing, netting, angling, shooting, and trapping. While some methods are destructive and illegal, such as electrocution, blasting, and poisoning, fishing is generally a wildlife activity enjoyed in different environments.

Whaling: Whaling is the hunting of whales for their valuable products like meat and oil, which played a crucial role during the Industrial Revolution. It began as an organized industry around 875 AD and became the main trade in Basque coastal regions by the 16th century. As the industry expanded globally, certain whale-rich areas became targets for whaling ships, leading to immense profits and resources. However, the excessive hunting pushed some whale species to near extinction. As a result, whaling was banned in many countries by 1969 and eventually ceased internationally in the late 1980s.

Manufacturing: Manufacturing is the process of producing goods using equipment, machines, labor, and chemical or biological processes. It is a vital part of the secondary sector of the economy and involves the transformation of raw materials into finished goods on a large scale. These goods can be sold to other manufacturers or distributed to end users and consumers through the tertiary industry.

Aerospace manufacturer: An aerospace manufacturer is involved in designing, building, testing, selling, and maintaining aircraft, parts, missiles, rockets, or spacecraft. It is a high-tech industry.

Automotive industry: The automotive industry includes numerous companies involved in the complete lifecycle of motor vehicles - from design to manufacturing, marketing, sales, repair, and modification. It is a massive global industry known for generating substantial revenue.

Chemical industry: The chemical industry produces industrial, specialty, and other chemicals by converting raw materials. It plays a central role in the world economy by providing commodity chemicals for industrial and consumer products. This industry encompasses petrochemicals, inorganic chemicals, agricultural chemicals, and other categories such as industrial gases, specialty chemicals, and pharmaceuticals.

Clothing industry: The clothing industry encompasses various trade and industrial sectors involved in the production and distribution of clothing, including textiles, fashion, apparel retailers, second-hand clothing, and textile recycling. It relies on advanced clothing technology such as the loom, cotton gin, and sewing machine, leading to industrialization. It is also referred to as allied, fashion, garment, or soft goods industry.

Food industry: The food industry is a diverse global network of businesses that supplies most of the world's food. It ranges from small, traditional family-run activities to large, mechanized industrial processes. Local agriculture, animal farming, produce, and fishing are important for many food industries.

Textile manufacturing: Textile manufacturing involves transforming fibers into yarn, then yarn into fabric. The fabric is dyed or printed and then used for various purposes like clothing, household items, upholstery, and industrial products.

Mining: Mining is the process of extracting valuable materials from the Earth's surface, including metals, coal, gemstones, and more. It is necessary for obtaining materials that cannot be grown or created in other ways. Mining also includes extracting non-renewable resources like petroleum, natural gas, and water.

Employment: Employment is a paid labor relationship between two parties, the employer and the employee. It is often based on a contract and involves the employer compensating the employee for assigned work. The employee receives wages, which can be hourly, piecework-based, or annual salary, depending on the job, sector conditions, and negotiation power. Additional benefits like health insurance, housing, and disability insurance may be provided. Employment is regulated by employment laws, organizations, or legal contracts.

Domestic worker: A domestic worker is someone who works within a residence and provides various household services, including cleaning, cooking, care for children and the elderly, and other household errands. They are also referred to as domestic servants and are traditionally known as being "in service" in English contexts.

Layoff: A layoff is the suspension or termination of employment for business reasons, affecting one or more employees. Originally temporary, it now refers to permanent elimination of a position. It is distinct from wrongful termination. Downsizing is reducing the number of employees in a company to improve shareholder value. Layoffs are often used as cost-cutting measures. Research shows that layoff announcements can increase a company's stock prices, providing motivation for regular layoffs among publicly-traded corporations.

Retirement: Retirement refers to the act of leaving one's job or reducing work hours to conclude an active professional life.

Unemployment: Unemployment refers to individuals of a specific age who are not employed or self-employed, but are actively seeking work during a particular period, as defined by the OECD.

Wage: A wage is payment from an employer to an employee for work done in a specific time period. It includes minimum wage, prevailing wage, bonuses, prizes, and tips. Wages are an expense for businesses and an employee's right, irrespective of company profitability.

Work (human activity): Work or labor is intentional human activity that supports the needs and wants of individuals, others, or the community. It is a key economic factor contributing to the production of goods and services within an economy.

Marketing: Marketing is the core business activity that involves finding customers and providing them with desired goods and services. It encompasses creating, communicating, delivering, and exchanging products to satisfy and keep customers.

Advertising: Advertising is the strategic practice of gaining attention for a product or service. Its main purpose is to highlight and attract consumer interest, usually through commercial advertisements. While primarily used for promoting specific goods or services, advertising has a wide range of applications.

Brand: A brand is a distinctive name, design, symbol, or feature that separates one seller's product or service from others. It plays a vital role in business, marketing, and advertising, fostering recognition and creating value known as brand equity. This benefits the brand's customers, owners, and shareholders. Additionally, brand names are often differentiated from generic or store brands.

Retail: Retail refers to the sale of goods and services directly to consumers, as opposed to selling to businesses or institutions. Retailers obtain products in bulk from manufacturers or wholesalers and sell them in smaller quantities to make a profit. They are the last step in the supply chain, connecting producers to consumers.

Shopping mall: A shopping mall is a large indoor shopping center, primarily anchored by department stores. Originally, the term "mall" referred to a pedestrian promenade with shops, but in the late 1960s, it became a common phrase for enclosed shopping centers. In the UK, these complexes are called shopping centres, whereas the term "shopping center" in North America covers a wider range. Usage varies in different countries. In Canada, Australia, and New Zealand, "mall" may be informally used, but the complex's name will typically include "shopping centre" or simply "centre."

Supermarket: A supermarket is a self-service shop with a large selection of food, drinks, and household items. It is smaller than a hypermarket but offers more options than earlier grocery stores. In everyday U.S. usage, "grocery store" is often used interchangeably with "supermarket."

Sales: Sales refer to the process of selling goods or services within a specific timeframe. It encompasses the number of items sold and can also include the provision of services for a fee. Additionally, a "sale" can refer to a temporary period of reduced prices for goods.

Tax: Tax is a mandatory charge imposed by governments on taxpayers to collectively fund public spending, regulate negative externalities, and reduce them. Tax compliance ensures correct payment, allowances, and relief. Taxation dates back to Ancient Egypt. Taxes can be direct or indirect and can be paid in money or labor.

Income tax: Income tax is a tax imposed on individuals or entities based on their income or profits. It is calculated by multiplying a tax rate with taxable income. Rates may differ based on the taxpayer's characteristics and the type of income.

Property tax: Property tax is a tax on the value of a property. It is an ad valorem tax that applies to real estate.

Sales tax: Sales tax is a payment added to the price of goods and services, collected by the seller on behalf of the government at the time of purchase.

Value-added tax: A value-added tax (VAT) or goods and services tax (GST) is an incremental tax levied at each stage of production, distribution, or sale. It is imposed on the price of a product or service and can be reclaimed by businesses. VAT is similar to sales tax but is an indirect tax where the burden may be different from the person paying it.

Teacher: A teacher, also known as a schoolteacher or educator, guides students in gaining knowledge, skills, and values through the act of teaching.

Economics: Economics studies how goods and services are created, shared, and used in society.

Econometrics: Econometrics is the statistical analysis of economic data to establish empirical connections between economic relationships. It combines theory and observation to quantitatively analyze real economic phenomena using appropriate inference methods. Economists use econometrics to extract simple relationships from large amounts of data. Jan Tinbergen and Ragnar Frisch are founding fathers of econometrics, with Frisch being the one to coin the term as it is known today.

Economic growth: Economic growth refers to the rise in value of goods and services produced by an economy over a year. It is measured as the percentage increase in real and nominal GDP.

Goods: Goods are items that satisfy human desires and provide utility. They can be transferred from one person to another. This distinguishes them from services, which cannot be transferred.

Gross domestic product: Gross domestic product (GDP) is a monetary measure of a country's total market value of final goods and services produced within a specific time period. It is primarily used by governments to evaluate the economic health of a nation. However, due to its complex and subjective nature, GDP often requires revisions to become a reliable indicator.

Inflation: Inflation is an economic term referring to a general increase in prices of goods and services, measured by the consumer price index (CPI). It leads to reduced purchasing power of money. The opposite of inflation is deflation. The inflation rate is a common measure, indicating the annualized percentage change in a general price index. The consumer price index (CPI) is often used to track inflation as prices vary for households.

Deflation: Deflation is an economic phenomenon characterized by a decline in the overall price level of goods and services. It occurs when the inflation rate drops below 0% and is different from disinflation, which is a slowdown in the inflation rate. Contrary to inflation, deflation increases the value of currency, allowing for the purchase of more goods and services with the same amount of money.

Labour economics: Labour economics investigates the mechanisms of wage labour markets, analyzing the supply of labour by workers and its demand by firms. It encompasses the social, cultural, and political elements that shape labourers' participation in these markets.

Macroeconomics: Macroeconomics is an economic branch that studies the overall performance, structure, and decision-making of entire economies. It covers topics such as GDP, unemployment, inflation, consumption, investment, trade, and finance on regional, national, and global scales.

Market (economics): A market is a system where parties exchange goods and services. Prices are established and resources are distributed through markets. They allow for the evaluation and pricing of any tradeable item. Markets can emerge spontaneously or be intentionally created by human interaction. Customary rules and customs maintain markets, such as competitive pricing and sources for goods. They replace gift economies.

Black market: A black market refers to an illegal or underground economy that operates outside the boundaries of established rules and regulations. It involves transactions that are prohibited by law or non-compliant with institutional guidelines. Examples include illegal drug trade, prostitution, currency trafficking, and human trafficking. Engaging in the production or distribution of prohibited goods and services makes individuals part of this illegal economy. The evasion of income tax also falls under the black market, known as the unreported economy.

Market failure: Market failure refers to a situation where a free market's allocation of goods and services is not efficient, resulting in a loss of economic value. It occurs when individuals' pursuit of self-interest leads to outcomes that can be improved from a societal perspective. The term was first used by economists in 1958 but traces back to the philosopher Henry Sidgwick. Market failures are commonly linked to public goods, information disparities, non-competitive markets, principal-agent issues, or externalities.

Microeconomics: Microeconomics studies the decisions made by individuals and firms in allocating limited resources. It examines the interactions within markets, sectors, or industries, rather than the overall national economy, which is the focus of macroeconomics.

Service (economics): A service in economics refers to an act or use that individuals or organizations are willing to pay for. Examples include professions such as doctors, lawyers, mechanics, and banks. Public services are paid for by society as a whole. Service providers use resources, skill, and experience to provide value to customers through intangible acts or performances.

Subsidy: A subsidy is a government expenditure aimed at stabilizing the economy through support for individuals, households, and businesses. It ensures access to essential goods and services for individuals and helps businesses stay afloat and competitive. Subsidies also facilitate long-term economic stability and enable governments to respond to economic shocks, like the COVID-19 pandemic.

Supply and demand: Supply and demand is an economic model that explains how prices are determined in a market. It states that in a competitive market, the price of a good will adjust until the quantity demanded equals the quantity supplied, leading to an equilibrium. This concept is the foundation of modern economics.

Economy: An economy encompasses the production, distribution, and trade of goods and services. It is a social domain involving the use and management of scarce resources. Factors such as culture, education, technology, history, and natural resources shape an economy. It is a network of human practices and transactions that cannot exist independently.

Economy of China: China has an upper middle income, mixed, socialist market economy with strategic five-year plans. It is the second largest economy globally by GDP and the largest by purchasing power parity since 2016. China's GDP fluctuates due to currency exchange rates. In 2022, it accounted for around 19% of the global economy. China historically had a strong economy for much of the past 2,000 years. Its economy includes public and state-owned enterprises, a large private sector, and welcomes foreign businesses. Economic growth is driven by private investment, exports, and domestic consumption.

Economy of the European Union: The European Union (EU) has the second largest economy in the world after the United States in terms of nominal GDP and the third largest in terms of purchasing power. The EU's GDP is estimated to be about $19.35 trillion in 2024, comprising about one sixth of the global economy. Among EU countries, Germany has the largest national GDP, followed by France and Italy.

Economy of the United States: The US has the world's largest and highly developed mixed economy. It leads in nominal GDP and is second in purchasing power parity (PPP). Its per capita GDP ranks seventh (nominal) and eighth (PPP). The US accounts for 25.4% of the global economy (nominal) and 15.6% (PPP). The US dollar is the most widely used international currency and is backed by a strong treasuries market, serving as the reserve currency. It is also adopted as official or de facto currency by several nations.

Alibaba Group: Alibaba Group is a Chinese multinational technology company that specializes in e-commerce and other internet-related services. It was founded in 1999 and offers consumer-to-consumer, business-to-consumer, and business-to-business sales services through its marketplaces. The company also provides logistics, cloud computing, and digital media services. Alibaba Group operates globally and owns a diverse range of companies across various industries.

Amazon (company): Amazon.com, Inc. is a prominent American multinational technology company known for its e-commerce, cloud computing, digital streaming, online advertising, and artificial intelligence initiatives. It holds a place among the top five big technology companies in the United States, together with Alphabet, Apple, Meta, and Microsoft.

Apple Inc.: Apple Inc. is a tech giant based in Silicon Valley that designs, develops, and sells a range of consumer electronics and software applications. Their iconic devices include the iPhone, iPad, Mac, Apple Watch, and Apple TV. They also provide popular software services like iTunes, iCloud, and Apple Music.

AT&T: AT&T is a major American telecom holding company headquartered in Dallas. It is the world's fourth-largest telecom firm by revenue and the biggest wireless provider in the US. As of 2023, AT&T ranked 13th on the Fortune 500 list, generating $120.7 billion in revenue.

IBM: IBM, or International Business Machines Corporation, is a renowned American multinational technology company based in New York. It operates in over 175 countries and specializes in computer hardware, software, and consulting services. With 19 research facilities worldwide, IBM holds the record for the most U.S. patents generated by a business for 29 consecutive years from 1993 to 2021.

Microsoft: Microsoft is a multinational technology corporation that is headquartered in Redmond, Washington. It is known for its Windows operating systems, Microsoft 365 suite, and Edge web browser. Additionally, Microsoft produces Xbox game consoles and the Microsoft Surface line of personal computers. With a high ranking in the Fortune 500, it is the world's leading software maker and a prominent member of the Big Five American technology companies.

Samsung: Samsung is a South Korean conglomerate known for manufacturing a wide range of products. It is the largest South Korean chaebol, with affiliated businesses operating under the Samsung brand. The company is headquartered in Samsung Digital City, Suwon. As of 2020, Samsung has the eighth-highest global brand value.

McDonald's: McDonald's is an American fast food chain founded in 1940 by Richard and Maurice McDonald. It started as a hamburger stand in San Bernardino, California, and later became a franchise. The iconic Golden Arches logo was introduced in 1953. In 1955, Ray Kroc joined the company and eventually bought it out. McDonald's is headquartered in Chicago since 2018. Apart from its food business, it operates as a real estate company, owning 70% of restaurant buildings and 45% of the land they stand on.

Nestlé: Nestlé is a Swiss multinational food and drink corporation, known for its impressive revenue and global presence. This conglomerate, headquartered in Vevey, Switzerland, has been the largest publicly held food company since 2014. It holds a prominent position on lists like Fortune Global 500 and Forbes Global 2000.

General Electric: General Electric (GE) is a prominent American conglomerate, founded in 1892 and based in Boston. With diverse divisions in aerospace, power, renewable energy, digital industry, additive manufacturing, and venture capital and finance, GE is an influential multinational company.

Nintendo: Nintendo is a leading Japanese video game company that creates and sells video games and game consoles from its headquarters in Kyoto.

The Walt Disney Company: The Walt Disney Company, commonly known as Disney, is a multinational entertainment conglomerate headquartered in California. Founded in 1923 by brothers Walt Disney and Roy Disney, it started as Disney Brothers Studio before changing its name in 1986. Disney became a leader in animation with the groundbreaking film Steamboat Willie in 1928, which introduced Mickey Mouse and established Disney's iconic status.

Standard Oil: Standard Oil was an American oil company that operated from 1870 to 1911. Founded by John D. Rockefeller, it became the world's largest petroleum company and made Rockefeller immensely wealthy. However, it was dismantled by the U.S. Supreme Court in 1911 for being an illegal monopoly.

Walmart: Walmart is a US-based multinational retail corporation, founded in 1962 by Sam and James "Bud" Walton. It runs hypermarkets, discount stores, and grocery stores, with headquarters in Bentonville, Arkansas. Walmart also owns Sam's Club warehouses.

Ford Motor Company: Ford Motor Company, an American multinational automaker founded by Henry Ford in 1903, is headquartered in Dearborn, Michigan. The company offers a range of automobiles and commercial vehicles under the Ford and Lincoln brands. It also holds a 32% stake in China's Jiangling Motors and has joint ventures in China, Taiwan, Thailand, and Turkey. Ford is listed on the New York Stock Exchange and is primarily controlled by the Ford family, who possess the majority of the voting power.

General Motors: General Motors (GM) is an American automotive manufacturing company based in Detroit, Michigan. It owns and manufactures well-known brands such as Chevrolet, GMC, Cadillac, and Buick. GM held the title of the largest automaker worldwide for 77 years until 2008 when Toyota surpassed it. In 2022, GM continued to be the leading automaker in the United States based on sales.

Toyota: Toyota is a Japanese multinational automotive manufacturer that was founded in 1937. It is headquartered in Toyota City, Aichi, Japan. As the largest automobile manufacturer globally, Toyota produces approximately 10 million vehicles annually.

Volkswagen: Volkswagen, a German automobile manufacturer, was founded in 1937 by the Nazi Party. After World War II, it was revived by Ivan Hirst and became a global brand. Known for its iconic Beetle, Volkswagen is the flagship brand of the largest automotive manufacturer, the Volkswagen Group. Its name derives from the German terms for "people's car." Its biggest market is in China, accounting for 40% of its sales and profits.

Airline: An airline is a company that transports passengers and/or freight using aircraft. They often form partnerships with other airlines for codeshare agreements. Airlines need to obtain an air operating certificate or license from a governmental aviation body. They can operate scheduled or charter flights.

Law: Law is a set of enforceable rules created by social or governmental institutions to regulate behavior. It can be described as a science and an art of justice, its definition has been debated. Laws can be made by legislatures, executives, or established by judges through precedent. Individuals can create legally binding contracts and alternative dispute resolution methods. Laws are influenced by constitutions and shape politics, economics, history and society while mediating relations between people.

Impartiality: Impartiality is a principle of justice that requires decisions to be made based on objective criteria, rather than personal bias or prejudice, ensuring fairness and equality by treating everyone equally without improper favoritism or discrimination.

Jurisprudence: Jurisprudence is the study of law's philosophy and theory, exploring what the law is and should be. It examines legal terms regarding individuals and society, as well as the values within the law. Jurisprudence encompasses various disciplines like sociology, history, politics, and economics.

Statutory interpretation: Statutory interpretation is the process of how courts interpret and apply laws. It is necessary when a case involves a statute that may have ambiguity. Judges use various tools and methods, such as traditional canons, legislative history, and purpose, to find the meanings of statutes. This process applies to both legislation made by the legislature and delegated legislation by administrative agencies in common law jurisdictions.

Justice: Justice refers to treating individuals fairly and equitably. It encompasses the idea that everyone should receive fair treatment.

Witness: A witness, in law, is a person who provides testimonial evidence, either willingly or under force, about their knowledge or claims. This evidence can be given orally or in written form.

Capital punishment: Capital punishment, also known as the death penalty, is the state-sanctioned practice of killing a person as punishment for a crime. It involves following a regulated process to determine the person's guilt. The punishment is usually ordered through a death sentence, and the act of carrying it out is called an execution. Offenders awaiting execution are commonly referred to as being "on death row". The term capital comes from execution by beheading, but various methods like hanging, shooting, lethal injection, stoning, electrocution, and gassing are employed.

Alternative dispute resolution: Alternative dispute resolution (ADR) refers to various techniques and processes that disputing parties use to resolve conflicts with assistance from a neutral third party. It is an effective alternative to litigation when parties cannot agree. ADR is increasingly being utilized within the court system for settling disputes.

Constitution: A constitution is a set of fundamental principles or precedents that establish the legal foundation of a polity, organization, or entity. It outlines the governance structure and methods of the said entity.

Customary law: Customary law is the practice of behavior within a society that can be proven, and is used as a defense based on long-standing acceptance and conformity with the law.

Precedent: Precedent is an authoritative principle established in a legal case that guides future court decisions on similar legal issues or facts. The doctrine of stare decisis requires courts to adhere to precedent.

Rights: Rights are fundamental principles that grant freedom and entitlements. These principles dictate what individuals are allowed to do or are owed by a legal system, social convention, or ethical theory. Rights hold paramount importance in areas including law and ethics, particularly in theories of justice and deontology.

Civil and political rights: Civil and political rights protect individuals' freedom from infringement by governments, organizations, and individuals, guaranteeing their participation in society and the state.

Presumption of innocence: The presumption of innocence is a legal principle where individuals accused of a crime are considered innocent until proven guilty. The burden of proof lies with the prosecution, who must provide compelling evidence for conviction. If the charges are not proven, the accused is acquitted. In most cases, the prosecution must prove guilt beyond a reasonable doubt. The opposite system is a presumption of guilt.

Suffrage: Suffrage, also known as franchise, is the right to vote in public elections and referendums. It encompasses active suffrage (voting) and passive suffrage (running for office), and the combination of both is called full suffrage.

Women's suffrage: Women's suffrage is the fight for women's right to vote. It gained momentum in the 18th century with the aim to change voting laws and grant women this right. Liberal political parties recognized the potential of including women in their constituencies and granted them the right to vote. To coordinate efforts worldwide, organizations like the International Woman Suffrage Alliance formed.

Administrative law: Administrative law governs executive branch agencies, including rule making, adjudication, and law enforcement. It is a branch of public law.

Passport: A passport is an official travel document issued by a government, certifying the holder's identity and nationality for international travel. It contains personal information such as full name, photograph, place and date of birth, and signature. Passports make it easier for individuals to travel to and from foreign countries and provide access to consular assistance. While usually issued by national governments, some subnational governments can also issue passports to citizens residing within their borders.

Civil law (legal system): Civil law is a legal system based on Roman and French law that is used in many countries. It is codified into a referable system and serves as the primary source of law. It is different from common law, which is based on judge-made decisions.

Common law: Common law refers to the body of law established by judges and quasi-judicial tribunals through written opinions. It is a legal system where precedent and decisions are important for future cases.

Criminal law: "Criminal law pertains to legal systems of different areas, distinct from civil law, as it primarily focuses on punishment and rehabilitation rather than resolving disputes and compensating victims."

Equity (law): Equity is a body of law developed in the English Court of Chancery to address legal cases where common law is inadequate. It has its own distinct rules and principles and was administered by separate courts.

Injunction: An injunction is a special court order that forces a party to either do or stop doing certain acts. Failure to comply with an injunction can result in criminal or civil penalties, including fines and imprisonment. It is a powerful remedy that allows a court to control a party's behavior.

Evidence (law): The law of evidence governs the proof of facts in legal proceedings. It determines what evidence is considered by the judge or jury when making decisions. The rules depend on the type of court and jurisdiction, and involve the amount, quality, and type of proof needed to win a case.

Property law: Property law is a legal domain that regulates ownership of real (land) and personal property. It encompasses resources like land, personal belongings, and intellectual property. Ownership can be transferred through contracts, and legal action can be taken under tort law to safeguard property rights.

Inheritance: Inheritance refers to the receiving of property, titles, debts, privileges, rights, and obligations after someone's death. Rules for inheritance vary across societies and have evolved. A person can officially pass on their property and debts through a will or other legitimate methods.

Tort: A tort is a civil wrong that causes harm or loss and leads to legal responsibility for the person who commits the act. It differs from criminal law as it aims to compensate individuals rather than punish them. Tort law applies even without a contract, unlike contract law.

Negligence: Negligence refers to a lack of appropriate care in specific circumstances. It is a legal concept in tort law, involving harm caused by failure to act responsibly, often with extenuating factors. The key idea is that individuals should exercise reasonable care by considering potential harm to others or their property.

Damages: Damages are a monetary award given to compensate for loss or injury. To receive damages, the claimant must prove a breach of duty resulting in foreseeable loss. The loss must be related to property, mental or physical harm, as pure economic loss is typically not considered.

Contract: A contract is a legally enforceable agreement between two or more parties, involving the transfer of goods, services, money, or future promises. Breach of contract can lead to damages or equitable remedies. In international law, a binding agreement is called a treaty.

Intellectual property: Intellectual property (IP) refers to intangible creations of the human intellect, encompassing patents, copyrights, trademarks, and trade secrets. The concept originated in England in the 17th and 18th centuries, with the term "intellectual property" gaining popularity in the 19th century. It has now become a prevalent aspect of legal systems worldwide.

Copyright: Copyright is a form of intellectual property that grants the creator or owner exclusive rights to copy, distribute, adapt, display, and perform their original work. It protects creative works like literature, art, education, and music for a limited time. However, it doesn't protect ideas themselves. Certain limitations, such as fair use, are in place based on public interest considerations.

Patent: A patent is a form of intellectual property that grants its owner exclusive rights to an invention. These rights allow the owner to prevent others from making, using, or selling the invention for a specific period of time. In exchange for these rights, the owner must disclose details about the invention. Patent rights are enforced through private legal action by the owner against those who infringe upon them.

International law: International law is a collection of rules and standards recognized as binding between nations. It covers various areas such as war, diplomacy, economics, and human rights. Unlike domestic laws, it mainly applies to states rather than individuals and operates based on consent. While states can choose not to follow international law or breach treaties, such violations can face condemnation and even result in measures like sanctions or war.

Law of war: The law of war is a part of international law that sets rules for starting wars and how conflicts are carried out. It establishes guidelines for sovereignty, nations, territories, occupation, and other important legal terms.

Religious law: Religious law refers to the ethical and moral codes taught by religious traditions. It varies in importance across different religious systems, with some being antinomian and others legalistic. Religions like Judaism, Islam, and the Baháʼí Faith emphasize the need for revealed positive law in both state and society. Conversely, Christianity generally rejects the necessity of such laws and prioritizes eternal moral precepts over civil, ceremonial, or judicial aspects.

Statutory law: Statutory law is written legislation passed by a legislature, contrasting oral or customary law and regulatory law. It originates from national, state, or local governments.

Trust (law): A trust is a legal relationship where a person gives property to someone else, who must use it for the benefit of another person or group. In English law, the person giving the property is the "settlor," the recipient is the "trustee," the beneficiary is the person benefiting, and the property is the "corpus" or "trust property." Testamentary trusts are made through wills after the settlor's death, while inter vivos trusts are made during the settlor's lifetime with a trust document. Trusts can be revocable or irrevocable, with irrevocable trusts being able to be canceled through a court process or with consent from the settlor and beneficiaries.

Will and testament: A will is a legal document stating a person's preferences for the distribution of their property after death. It also designates an executor to manage the property until it is distributed. In cases where no will exists, inheritance laws and intestacy come into play to determine property distribution.

Court: A court is a government institution with the authority to resolve legal disputes and administer justice in civil, criminal, and administrative matters. It is the primary means of dispute resolution in legal systems and guarantees the right for individuals to bring their claims before it. Defendants also have the right to present their defense in court.

Judiciary: The judiciary is a court system that settles legal disputes and interprets, defends, and enforces the law in legal cases.

Rule of law: The rule of law means that all individuals and institutions, including lawmakers and leaders, are bound by the same laws. It emphasizes that no one is above the law. It is related to constitutionalism and refers to a political situation, rather than a specific legal rule. The rule of law ensures equality before the law, prevents arbitrary use of power, and supports a nonarbitrary form of government.

Jury: A jury is a group of sworn individuals who listen to evidence, make an impartial decision, and officially submit their verdict or judgment handed down by a court.

Police: The police are a state-sanctioned body that enforces laws, protects citizens and their belongings, prevents crime and disorder, and maintains safety and health. They possess the authority to make arrests and use force as allowed by the state. Police forces operate within defined legal boundaries and are distinct from the military. They are typically funded through taxes and provide public sector services.

Security: Security refers to protection and resilience against potential harm caused by others. It restrains others from acting freely and safeguards individuals, groups, and objects vulnerable to unwanted change.

Judge: A judge presides over court proceedings, either alone or with other judges. They listen to witnesses, evaluate evidence and arguments presented by lawyers, and make rulings based on their interpretation of the law. Judges are expected to be impartial and usually conduct trials in open court.

Lawyer: A lawyer is a legal professional who practices law, with various roles and functions in different legal systems. They can be advocates, attorneys, barristers, or legal executives, among others. Their work involves applying legal knowledge to solve specific problems and advancing the interests of the law and legal profession.

Crime: A crime is an unlawful act that can be punished by the government or other authority. There is no universal definition, but it is generally considered as an act that harms individuals, communities, societies, or the state, and is forbidden and punishable by law.

Organized crime: Organized crime refers to centralized enterprises engaging in illegal activities, often for profit. It includes various groups, such as terrorist organizations and rebel forces, driven by political motivations. These criminal organizations commonly rely on fear, adopt authoritarian tactics, and may cater to demand for illegal goods or banned services. Extortion and control tactics, like protection money, are used to force compliance. Street gangs can also be considered organized crime groups. Terms like mafia, mob, syndicate, or outfit are used to describe these criminal networks, known as the underworld or gangland. The Mafia's economic study influenced research on Russian mafia, Chinese triads, Hong Kong triads, and Japanese yakuza.

Gang: A gang is a group of people with leadership and organization that asserts control over a specific territory and engages in illegal and often violent activities. These activities are frequently considered organized crime.

Domestic violence: Domestic violence encompasses abuse within personal relationships and households. It can occur between partners, former spouses, parents, children, or the elderly. This abuse takes various forms, such as physical, verbal, emotional, economic, religious, reproductive, financial, and sexual. It ranges from subtle manipulation to severe acts like rape, acid attacks, and even murder. The use of technology for harassment or stalking is also part of this issue. The definition of domestic violence has been expanded to include coercive control.

Assault: Assault is the illegal act of causing physical harm or unwanted physical contact, or the threat to do so. It can lead to criminal prosecution, civil liability, or both. Assault can involve using a weapon or range from physical violence to threats of violence. It is commonly referred to as an attempt to commit battery. Depending on the severity, it carries penalties such as fines, imprisonment, or death.

Battery (crime): Battery is a criminal offense that involves unlawful physical contact, differentiating it from assault. Unlike assault, which creates fear or apprehension of physical contact, battery refers to the actual act of physically touching someone unlawfully.

Kidnapping: Kidnapping is the illegal act of forcefully abducting and detaining someone against their will. It may involve the use of force, fear, or simply enticing the victim.

Homicide: Homicide refers to an act causing the death of another person, which can include accidental, reckless, or negligent actions without intent to cause harm. It encompasses various legal categories like murder, manslaughter, justifiable homicide, assassination, killing in war, euthanasia, and capital punishment. Society treats these types differently - some are considered crimes, while others are permitted or ordered by the legal system.

Murder: Murder is the unlawful killing of a human with intent, without a valid reason, as determined by the law in a specific jurisdiction. It is differentiated from manslaughter, which is a killing without malice or with diminished capacity. Manslaughter can be voluntary, due to reasonable provocation, or involuntary, lacking significant intent and recklessness.

Robbery: Robbery is a crime that involves forcibly taking or attempting to take something of value through force or fear. It is a form of theft, distinguished by its violent nature. Robbery is a felony in jurisdictions that distinguish it from other types of theft. In English law, it can only be tried on indictment. The word "rob" derived from Late Latin words of Germanic origin meaning "theft".

Sexual assault: Sexual assault is non-consensual sexual contact or forcing someone to engage in a sexual act against their will. It encompasses various forms like child sexual abuse, groping, rape, drug facilitated assault, and sexually torturing someone.

Rape: Rape is a non-consensual sexual assault involving intercourse or penetration. It can occur through force, coercion, abuse of authority, or against vulnerable individuals. The term is often used interchangeably with sexual assault.

Fraud: Fraud is intentional deception aimed at gaining unfair or illegal advantages or depriving others of their legal rights. It can occur in civil or criminal contexts, even if no monetary loss is involved. The motive behind fraud can be financial gain or obtaining benefits like passports or mortgages through deceitful means.

Piracy: Piracy is the act of robbery or violence committed by attackers on ships or in coastal areas, with the aim of stealing valuable cargo. These attackers are called pirates and the ships they use are known as pirate ships. Piracy dates back to the 14th century BC, with the Sea Peoples being among the earliest documented pirates. Narrow shipping channels have historically provided opportunities for piracy, privateering, and commerce raiding.

Illegal drug trade: The illegal drug trade refers to the global black market that involves the production, distribution, and sale of prohibited drugs. Countries around the world have strict laws prohibiting this trade, but it continues to thrive. Estimates suggest that this illicit market was worth between US$426 and US$652 billion in 2014 alone, making up almost 1% of global trade. Despite efforts by local authorities, the consumption of illegal drugs remains widespread and challenging to curb.

Smuggling: Smuggling refers to the illegal transportation of objects, substances, information, or people, in violation of laws and regulations. This includes moving items out of buildings, into prisons, or across international borders. It involves purposefully crossing borders against legal frameworks.

Theft: Theft is the act of taking someone's property or services without permission to deprive the rightful owner. It encompasses crimes like larceny, robbery, embezzlement, and more, and is sometimes used interchangeably with larceny. A person who commits theft is known as a thief.

Driving under the influence: Driving under the influence (DUI) is the act of driving a vehicle while impaired by alcohol or drugs, making the driver unable to operate the vehicle safely. Various terms are used to describe this offense in different jurisdictions.

Human trafficking: Human trafficking is the illegal trade of humans, involving forced labor, sexual slavery, and commercial sexual exploitation.

Torture: Torture is the intentional causing of intense pain or suffering to individuals as a means of punishment, obtaining confessions, extracting information, or intimidating others. It is sometimes attributed only to state actions, but can also involve non-state entities.

Forensic science: Forensic science, or criminalistics, applies scientific principles and methods to assist legal decision-making in criminal and civil matters.

Declaration of the Rights of Man and of the Citizen: The Declaration of the Rights of Man and of the Citizen is a human civil rights document from the French Revolution. It was set by France's National Constituent Assembly in 1789 and was influenced by Enlightenment philosophers. This declaration played a vital role in shaping popular conceptions of individual liberty and democracy globally.

Magna Carta: Magna Carta is a royal charter of rights agreed by King John of England at Runnymede in 1215. It promised protection for the barons, church rights, fair justice, and limits on feudal payments. The charter was nullified by Pope Innocent III, triggering the First Barons' War.

Statute of Westminster 1931: The Statute of Westminster 1931 is a UK parliamentary act that defines the relationship between the Crown and the Dominions.

Constitution of the United States: The United States Constitution is the highest law in the US. It replaced the Articles of Confederation in 1789. It consists of seven articles that establish the structure of the federal government, with three branches: legislative, executive, and judicial. It also defines federalism and the rights and responsibilities of the states. The Constitution is the world's oldest and longest-standing written national constitution in effect.

Geneva Conventions: The Geneva Conventions are international laws that set standards for how people in war should be treated. They consist of four treaties and three additional protocols. The agreements of 1949 updated previous treaties, expanded protections for prisoners, civilians, and military personnel, and defined rights for the wounded, sick, and civilians in war-zones.

International Covenant on Civil and Political Rights: The International Covenant on Civil and Political Rights (ICCPR) is a treaty that requires countries to uphold the rights of individuals, such as the right to life, freedom of religion, speech, assembly, and fair trial. It was adopted by the UN in 1966 and came into effect in 1976. Currently, 173 countries are parties to the Covenant, with China and Cuba being notable signatories yet to ratify it. North Korea is the only country that has attempted to withdraw from the treaty.

International Covenant on Economic, Social and Cultural Rights: The International Covenant on Economic, Social and Cultural Rights (ICESCR) is a UN treaty adopted in 1966 and effective since 1976. It commits parties to grant economic, social, and cultural rights to all individuals, including those in Non-Self-Governing and Trust Territories. These rights encompass labor, health, education, and an adequate standard of living. Currently, the Covenant has 171 parties, while four countries, including the US, have signed but not ratified it.

United States Declaration of Independence: The Declaration of Independence is the founding document of the United States. It was adopted on July 4, 1776, by 56 delegates at the Second Continental Congress in Philadelphia. The declaration states that the Thirteen Colonies are independent sovereign states, no longer under British rule.

Universal Declaration of Human Rights: The Universal Declaration of Human Rights (UDHR) is an international document adopted by the United Nations General Assembly, guaranteeing the rights and freedoms of all people. It was drafted by a UN committee chaired by Eleanor Roosevelt and accepted as Resolution 217 on 10 December 1948. Out of 58 UN members, 48 voted in favor, none against, eight abstained, and two did not vote.

Nuremberg principles: The Nuremberg principles are guidelines created by the UN's International Law Commission to determine war crimes, codifying the legal principles of the Nuremberg Trials that prosecuted Nazi party members after WWII.

African Union: The African Union (AU) is a continental union of 55 member states in Africa. It was established on 26 May 2001 and launched on 9 July 2002 to replace the Organization of African Unity (OAU). The AU's main decision-making body is the Assembly, which consists of heads of state and government.

Arab League: The Arab League, also known as the League of Arab States, is a regional organization in the Arab world. It was established on 22 March 1945 in Cairo with Egypt, Iraq, Transjordan, Lebanon, Saudi Arabia, and Syria as founding members. Yemen joined shortly after. The League currently consists of 22 members and operates in North Africa, West Asia, and part of East Africa.

ASEAN: ASEAN, short for Association of Southeast Asian Nations, is a union of 10 Southeast Asian states that promotes political and economic cooperation. With a combined population of over 600 million and a land area of 4.5 million km2, ASEAN wields significant influence. Its member states boast rapidly growing economies, collectively contributing about 6.5% to global GDP. The bloc is a key player in the region, fostering collaboration and growth among its members.

Commonwealth of Independent States: The Commonwealth of Independent States (CIS) is a regional organization in Eurasia created after the Soviet Union's dissolution in 1991. It spans an area of 20,368,759 km2 and is home to an estimated 239,796,010 people. The CIS aims to foster collaboration in economic, political, and military matters, and has authority over trade, finance, legislation, security, and combating transnational crime.

Commonwealth of Nations: The Commonwealth of Nations, also known as the Commonwealth, is an international association of 56 member states, mostly former British territories. It comprises the Commonwealth Secretariat and the Commonwealth Foundation, which focus on intergovernmental cooperation and non-governmental relations among member countries. Several other organizations are affiliated with and operate within the Commonwealth.

Council of Europe: The Council of Europe is an international organization established in 1949 to promote human rights, democracy, and the rule of law in Europe. It has 46 member states and a population of around 675 million. The organization operates on a budget of approximately 500 million euros annually.

European Union: The European Union (EU) is a political and economic union of 27 member states in Europe, covering an area of 4,233,255 km2 and with over 448 million people. It is considered a unique entity, blending federation and confederation characteristics.

G20: The G20 is an intergovernmental forum made up of 19 countries, the EU, and the AU. It aims to tackle significant global economic issues and promote international financial stability, as well as addressing concerns related to climate change mitigation and sustainable development.

Interpol: Interpol is the world's largest international police organization, headquartered in Lyon, France. It facilitates global police cooperation and crime control through seven regional bureaus worldwide and National Central Bureaus in all 196 member states.

League of Nations: The League of Nations, founded in 1920 after World War I, aimed to maintain global peace. It operated until 1946 when its functions were transferred to the United Nations. As a pioneering organization, it significantly influenced modern global governance.

NATO: NATO is an intergovernmental military alliance formed after WWII with 31 member states. Its purpose is collective security, with members committed to defending each other against third-party attacks. Initially created to counter the Soviet Union during the Cold War, it has continued to exist and engage in military operations worldwide. NATO operates under the North Atlantic Treaty and has played a significant role in conflicts in the Balkans, Middle East, South Asia, and Africa. Its motto is "animus in consulendo liber."

North American Free Trade Agreement: The North American Free Trade Agreement (NAFTA) was a trilateral trade bloc created by Canada, Mexico, and the United States. It came into force on January 1, 1994, replacing the Canada-United States Free Trade Agreement. NAFTA formed one of the world's biggest trade blocs based on gross domestic product.

OECD: The OECD is an intergovernmental organization established in 1961 to promote economic progress and global trade. With 38 member countries that value democracy and the market economy, it serves as a platform for sharing policy experiences, addressing common issues, exchanging best practices, and coordinating domestic and international policies among its members.

OPEC: OPEC, or the Organization of the Petroleum Exporting Countries, is a coalition of top oil-producing nations established in 1960 to collectively influence the global oil market and maximize profitability. Headquartered in Baghdad, it currently consists of 12 member countries, accounting for approximately 30 percent of global oil production.

Organization of American States: The Organization of American States (OAS) is an international organization created in 1948 to encourage collaboration among its member states throughout the Americas.

Organization for Security and Co-operation in Europe: The Organization for Security and Co-operation in Europe (OSCE) is a regional intergovernmental organization focused on security. It includes member states from Europe, North America, and Asia. Its responsibilities span various areas, including arms control, human rights, freedom of the press, and fair elections. OSCE employs around 3,460 individuals across its field operations, secretariat in Vienna, and institutions. The organization holds observer status at the United Nations.

United Nations: The United Nations (UN) is the largest international organization, with the goal of maintaining global peace, promoting friendly relations among nations, fostering international cooperation, and providing a platform for harmonizing national actions. Its headquarters are in New York City, and it has offices in Geneva, Nairobi, Vienna, and The Hague. The International Court of Justice is based in The Hague.

International Atomic Energy Agency: The International Atomic Energy Agency (IAEA) is an intergovernmental organization under the United Nations that promotes the peaceful use of nuclear energy and prevents its military exploitation. Established in 1957, the IAEA reports to both the General Assembly and the Security Council of the United Nations, with its headquarters in Vienna, Austria.

International Court of Justice: The International Court of Justice (ICJ), also known as the World Court, is a key organ of the UN. It resolves conflicts between nations based on international law and provides guidance on global legal matters. As the sole international court handling general disputes between countries, its decisions and opinions hold significant weight in shaping international law.

International Criminal Court: The International Criminal Court (ICC) is a permanent international tribunal located in The Hague, Netherlands. It is the only court with the authority to prosecute individuals for genocide, crimes against humanity, war crimes, and the crime of aggression. Unlike the International Court of Justice, which resolves disputes between states, the ICC is an independent organization focused on prosecuting serious international crimes.

International Monetary Fund: The International Monetary Fund (IMF) is a global financial institution under the United Nations, funded by 190 member countries. It acts as a lender of last resort for governments and promotes exchange-rate stability. Established in 1945 with 29 member countries, its mission is to foster global monetary cooperation, ensure financial stability, facilitate international trade, promote employment, sustainable growth, and reduce poverty. The IMF manages balance of payments difficulties and financial crises through a quota system, where countries contribute funds for others to borrow. As of 2016, the fund held SDR 477 billion.

UNESCO: UNESCO is a UN agency that promotes global peace and cooperation in education, arts, sciences, and culture. It has 194 member states and 12 associate members. Based in Paris, France, UNESCO has regional offices and national commissions worldwide.

UNICEF: UNICEF, previously known as the United Nations International Children's Emergency Fund, is now officially called the United Nations Children's Fund. It is a renowned agency under the United Nations that offers humanitarian aid and developmental assistance to children globally. Operating in 192 countries and territories, UNICEF is one of the most recognized social welfare organizations. Their initiatives encompass a range of activities, such as providing vaccinations, disease prevention, HIV treatment for children and mothers, improving nutrition for children and mothers, enhancing sanitation, promoting education, and delivering emergency relief during disasters.

World Bank Group: The World Bank Group (WBG) is the largest development bank globally, comprising five international organizations. It offers leveraged loans and assistance to developing countries, seeking to end extreme poverty and promote shared prosperity. With its headquarters in Washington, D.C., it provided around $98.83 billion in loans in the 2021 fiscal year. Its five organizations include the International Bank for Reconstruction and Development (IBRD), the International Development Association (IDA), the International Finance Corporation (IFC), the Multilateral Investment Guarantee Agency (MIGA), and the International Centre for Settlement of Investment Disputes (ICSID).

World Health Organization: The World Health Organization (WHO) is a United Nations agency headquartered in Geneva, Switzerland. It is responsible for global public health and operates through six regional offices and 150 field offices around the world.

World Trade Organization: The World Trade Organization (WTO) is an intergovernmental organization that regulates and facilitates global trade. It was established in 1995, replacing the General Agreement on Tariffs and Trade (GATT). The WTO governs international trade rules and has 164 member states representing over 98% of global trade and GDP.

International Red Cross and Red Crescent Movement: The International Red Cross and Red Crescent Movement is a global humanitarian organization with 16 million volunteers, members, and staff. Its purpose is to protect human life and health, promote respect for all individuals, and alleviate human suffering. It consists of three independent organizations unified by common basic principles, objectives, symbols, statutes, and governing bodies.

Nobel Prize: The Nobel Prize is a set of five awards given annually to individuals who have made significant contributions to humanity. Established by Alfred Nobel's will in 1895, the prizes were first awarded in 1901. Nobel, a Swedish chemist and engineer known for inventing dynamite, left his assets to create these prestigious awards.

Scouting: Scouting is a global youth movement that uses practical outdoor activities to provide informal education. It emphasizes camping, hiking, sports, and aquatics. The Scout uniform promotes equality by hiding social differences and includes distinctive insignia like the fleur-de-lis and merit badges.

Chinese Communist Party: The Chinese Communist Party (CCP) is the ruling party of the People's Republic of China (PRC) since its establishment in 1949. Led by Mao Zedong, the CCP emerged victorious in the Chinese Civil War against the Kuomintang. It governs China and controls the People's Liberation Army (PLA). The party's constitution outlines its ideology, known as socialism with Chinese characteristics. With over 98 million members, the CCP is the world's second largest political party.

Politics: Politics refers to the activities involved in decision-making and power dynamics within groups. It encompasses the distribution of resources and status among individuals. The study of politics and government is undertaken in the field of political science.

Political science: Political science is the study of politics, governance systems, power, and political activities, behavior, thought, and laws.

Diplomacy: Diplomacy is the art of influencing international events through spoken or written communication by representatives of states or organizations, with the aim of achieving desired outcomes in the global system.

Diplomatic mission: A diplomatic mission is a group representing a state or organization in another state. Usually, it refers to an embassy or high commission, based in the host state's capital. Consulates are smaller missions in major cities. Embassies can also act as nonresident missions to other countries.

International relations: International relations (IR) refers to the interactions between sovereign states, encompassing areas like war, trade, diplomacy, and foreign policy. It also includes relations with other international actors such as intergovernmental organizations, NGOs, legal bodies, and multinational corporations. The study of IR is an important field, categorized into schools of thought like realism, liberalism, and constructivism.

Imperialism: Imperialism is the act of exerting and expanding power over foreign nations through various means, including military force and cultural influence. It aims to establish dominance, often in the form of a formal empire, and differs from colonialism.

Colonialism: Colonialism refers to the dominance of one group over others, typically for imperial control and exploitation. It involves the establishment of colonies and the implementation of various practices and relationships to maintain this dominance. However, the definition of colonialism may vary depending on the context and how the term is used.

Globalization: Globalization refers to the worldwide interaction and integration among people, companies, and governments. It emerged in the 20th century and gained popularity in the 1990s, characterizing the unprecedented global connectivity after the Cold War. This process originated in the 18th and 19th centuries with advancements in transportation and communication technology. It has led to increased international trade, exchange of ideas, beliefs, and culture. Globalization primarily pertains to economic interaction but also encompasses social, cultural, and diplomatic aspects in its history.

Civics: Civics is the study of citizens' rights and responsibilities in society, derived from the Latin word civicus meaning "relating to a citizen." It encompasses the study of behavior that impacts fellow citizens, particularly within urban development.

Citizenship: Citizenship grants individuals civil and political rights within a particular political entity, alongside corresponding responsibilities that non-citizens do not have.

Civil liberties: Civil liberties are freedoms protected by governments through constitution, laws, and judicial interpretations. They include freedom of conscience, press, religion, expression, assembly, security, speech, privacy, equal treatment, due process, fair trial, and life. Other civil liberties include property ownership, self-defense, and bodily integrity. Positive rights (e.g., right to education) and negative rights (e.g., freedom from interference) are distinguished within civil liberties.

Freedom of speech: Freedom of speech is the principle that allows individuals and communities to freely express their opinions and ideas without fear of punishment or censorship. It is recognized as a human right by the United Nations and protected by constitutional laws in many countries. The term "freedom of speech" is often used interchangeably with "freedom of expression," which encompasses the sharing and receiving of information or ideas through any medium.

Freedom of religion: 'Freedom of religion' refers to the principle that allows individuals or communities to freely express their religious beliefs, practices, and teachings in public or private settings. It encompasses the freedom to worship, observe, and manifest one's religion. The concept also includes the right to choose not to follow any religion or belief system.

Freedom of thought: 'Freedom of thought' refers to an individual's right to independently form and retain thoughts, beliefs, and perspectives without being influenced by others. It encompasses the autonomy to hold personal views and consider facts, irrespective of differing opinions.

Election: An election is a formal process where a population selects individuals for public office through a group decision-making process.

Opinion poll: An opinion poll, also called a survey or poll, is a research method that gathers public opinion from a sample population. It uses a series of questions to represent the views of a larger population within certain confidence intervals. Pollsters are individuals who conduct these surveys.

Political campaign: A political campaign is an organized effort to influence decision-making in a specific group, commonly referring to electoral campaigns in democracies. They mainly focus on general elections and candidates for head of state or government, such as a president or prime minister.

Political party: A political party is an organization that coordinates candidates in elections. Members share similar political ideas and may promote specific goals or ideology.

Referendum: A referendum is a direct vote by the people on a proposal or issue, allowing them to adopt new policies or laws. It is different from a representative vote. It can also be advisory and is called plebiscite, votation, popular consultation, or ballot question in some countries.

Nation: A nation is a social organization with a collective identity formed by shared features like language, history, ethnicity, culture, territory, or society. It can be based on either ethnicity or political constitutions.

Revolution: A revolution is a deliberate and sudden effort in political science to bring about fundamental changes in political power and organization. It often entails an uprising against a government believed to be oppressive or politically ineffective.

Riot: A riot is a violent public disturbance where a group opposes authority, damages property, or harms people. It is a form of civil disorder marked by aggressive mob behavior.

Cult of personality: A cult of personality is the creation of an idealized and heroic image of a leader through techniques like mass media, propaganda, and government-organized demonstrations. It is established by modern social engineering, often in totalitarian or authoritarian governments, but can also be found in some monarchies, theocracies, and failed democracies.

Government: A government is a system or group that governs a community or state. It provides organization and leadership for society.

Dictatorship: A dictatorship is an autocratic government where a leader or a group holds unlimited power. Political control is maintained through an inner circle of elites, including advisers and high-ranking officials. The dictator suppresses opposition by appeasing the inner circle and repressing rival parties or armed resistance. Dictatorships can arise from military coups or when elected leaders solidify their rule. They are authoritarian or totalitarian and can take the form of military, one-party, personalist, or absolute monarchies.

Democracy: Democracy is a government system where the power lies with the people. It ensures human rights and freedoms are respected, allowing people to freely express their will.

Oligarchy: Oligarchy is a power structure where a small group of individuals, whether based on factors like wealth, education, or political control, hold most of the power.

Theocracy: Theocracy is a government where one or more gods are seen as the highest authority, guiding human intermediaries who run the daily affairs.

Monarchy: A monarchy is a governmental system where a monarch, the head of state, serves for life or until they step down. The authority of the monarch can range from symbolic to autocratic, and their power extends across all branches of government.

Absolute monarchy: An absolute monarchy is a type of monarchy where the ruler has unlimited power and is not restricted by any laws or governing bodies. The monarch has absolute control and often inherits the throne through hereditary succession.

Constitutional monarchy: A constitutional monarchy, also called a limited or parliamentary monarchy, is a type of government where the monarch's authority is defined by a constitution and they share decision-making power. Unlike absolute monarchies, constitutional monarchs have limits on their powers outlined in a legal framework.

Federalism: Federalism is a form of government where power is divided between a central government and regional governments. Johannes Althusius and Montesquieu are considered the modern fathers of this political philosophy. Althusius explained its principles in his book "Politica Methodice Digesta, Atque Exemplis Sacris et Profanis Illustrata" (1603), while Montesquieu identified examples of federalist republics in his work "The Spirit of Laws." Federalism originated in the unions of states during the Old Swiss Confederacy.

Republic: A republic is a state where political power is held by the public through their elected representatives, distinct from a monarchy.

Decentralization: Decentralization is the dispersion of an organization's planning and decision-making authority away from a central authority or group, to smaller factions within it.

Executive (government): The executive branch of government, also known as the executive, is responsible for implementing and enforcing the law.

Head of state: A head of state is the official representative of a sovereign state. They can be a figurehead or hold executive power, depending on the country's government structure.

Legislature: A legislature is a governing body that has the power to make laws for a political entity. It is distinct from the executive and judicial branches of government.

Parliament: A parliament is a legislative body that represents the people, creates laws, and oversees the government through hearings. It is similar to a senate, synod, or congress and is used in countries with current or past monarchies. The term is commonly used in parliamentary systems, but can also describe the legislature in some presidential systems.

Public policy: Public policy refers to an established plan consisting of laws, regulations, guidelines, and actions to tackle real-world issues. It covers a broad range of areas, including education, healthcare, employment, finance, economics, and transportation. The implementation of public policy is known as public administration and encompasses both direct and indirect government activities.

Economic policy: Economic policy refers to the actions and decisions made by governments regarding taxation, budgets, money supply, interest rates, labor market, national ownership, and other areas of government intervention in the economy. It encompasses various systems and interventions that determine the economic conditions within a country.

Public administration: Public administration refers to the implementation of public policy and the management of government and non-profit entities. It is a sub-field of political science that trains civil servants for administrative roles in the public sector. Professionals with public administration knowledge can also work in the private sector, engaging in government relations, regulatory affairs, corporate social responsibilities, and other areas. Additionally, they may find employment in think tanks, non-profit organizations, consulting firms, and trade associations that benefit from their skillsets.

Civil service: The civil service refers to career civil servants employed in the public sector by government departments or agencies. Their tenure typically remains unchanged during transitions of political leadership. They work for central and state governments, serving the government rather than any specific political party.

Separation of powers: Separation of powers is the division of a state's government into branches, each with separate and independent powers to avoid conflicts. The three branches are the legislature, the executive, and the judiciary. It differs from systems with fused powers, such as monarchies or parliamentary systems, where branches may overlap in membership and functions.

State (polity): A state is a centralized political organization that imposes and enforces rules over a population within a territory. It is a polity that maintains a monopoly on the legitimate use of violence. The absence of a state does not eliminate the existence of a society. The level of governance determines whether a state has failed.

City-state: A city-state is an independent sovereign city that is the political, economic, and cultural hub of its surrounding territory. Examples include Rome, Athens, and Florence during different historical eras.

Nation state: A nation-state is a political unit where the state and the nation share the same boundaries, with the state being a centralized organization governing a population within a territory, and the nation being a community united by a common identity. Unlike a country, a nation-state typically has a predominant national or ethnic group.

Federation: A federation is a political entity where partially self-governing regions unite under a central government. The component states have constitutionally protected autonomy, and power is divided between the regions and the central authority, allowing each region to control its internal affairs.

Unitary state: A unitary state is a sovereign state with a central government as the ultimate authority. The central government can create or eliminate administrative divisions and chooses what powers to delegate. Unitary states originated in France after the Hundred Years' War, which led to the unification of the country. France then spread the concept through conquests in Europe and its extensive colonial empire.

Confederation: A confederation is a political union of sovereign states formed by a treaty to address important issues like defense, foreign relations, trade, or currency. The central government of a confederation must support all its members. Confederalism is a type of intergovernmentalism that emphasizes interactions between sovereign and independent states.

Empire: An empire is a political unit formed by conquering various regions and peoples. It consists of a dominant center that exercises political control over subordinate peripheries. Different populations within the empire have distinct rights and are governed differently. While an empire is typically governed by an emperor or empress, not all states with supreme authorities or large territories are considered empires. Acceptance as an empire by contemporaries and historians can vary.

Welfare state: A welfare state is a government system that safeguards and advances the economic and social well-being of its people through equal opportunities, fair wealth distribution, and public support for those unable to access basic necessities for a decent life.

Welfare: Welfare, also known as social welfare, is a form of government aid aimed at ensuring people in a society can fulfill basic human needs like food and shelter. It can encompass social security, which includes support for the elderly and children, medical treatment, leave for parents and the sick, unemployment and disability benefits, and assistance for those injured at work.

Sovereignty: Sovereignty is the supreme authority within a state, involving both internal hierarchy and external autonomy. It is assigned to the individual, group, or institution that holds ultimate power to establish or amend laws. In politics, it represents the highest legitimate authority over a community, while in international law, it refers to a state's exercise of power. De jure sovereignty is the legal right to do so, while de facto sovereignty relies on the factual ability. Issues arise when expected sovereignty is lacking, causing concern over the absence of legal and practical control within the same organization.

Ideology: Ideology is a set of beliefs or philosophies held for non-epistemic reasons, where practical elements are important. Initially used for economic, political, or religious theories, it now carries a condemnatory connotation.

Political spectrum: A political spectrum is a classification system that characterizes and categorizes various political positions in relation to each other. It represents these positions using geometric axes that portray independent political dimensions. It is also referred to as a political compass or political map, particularly when using popular two-dimensional models.

Anarchism: Anarchism is a political philosophy that questions authority and aims to eradicate coercive institutions, such as nation-states and capitalism. It advocates for stateless societies and voluntary associations. Anarchism is commonly associated with the far-left or libertarian socialist movement.

Totalitarianism: Totalitarianism is a highly controlling political system where all opposition is forbidden, including individual and group opposition. It involves extensive regulation of public and private life and is considered the extreme form of authoritarianism. Typically, autocrats like dictators hold political power and use state-controlled media to control citizens through propaganda campaigns.

Capitalism: Capitalism is an economic system where private individuals own and operate businesses to make a profit. Key characteristics include capital accumulation, competitive markets, price systems, private property, property rights recognition, voluntary exchange, and wage labor. Owners of wealth determine decision-making and investments, while competition in markets determines prices and distribution of goods and services.

Socialism: Socialism is a political philosophy advocating social ownership instead of private ownership of the means of production. It encompasses diverse economic, political, and social systems, with social ownership being the common element. Socialism is typically associated with the left-wing and can take various forms, such as public, community, collective, cooperative, or employee-owned. Different approaches exist regarding the role of markets, resource allocation, organizational management, and the need for government intervention.

Communism: Communism is a left-wing ideology aiming to establish a communist society where common ownership of means of production, distribution, and exchange exists. It seeks to eliminate private property, social classes, money, and the state.

Marxism: Marxism is a political philosophy using historical materialism to analyze class relations and social conflict. It was developed by Karl Marx and Friedrich Engels in the 19th century. With no definitive theory, it has influenced left-wing movements worldwide.

Leninism: Leninism, developed by Vladimir Lenin, is a political ideology aiming to establish communism through a dictatorship of the proletariat led by a revolutionary vanguard party. Lenin's contributions focus on theories related to the party, imperialism, the state, and revolution. The Leninist vanguard party guides the working classes towards political consciousness and revolutionary leadership to overthrow capitalism.

Fascism: Fascism is an extreme, right-wing ideology led by a dictator, emphasizing militant nationalism, rigid hierarchy, and the suppression of opposition through force. It champions the nation or race above individual interests, tightly controlling society and the economy.

Nazism: Nazism, also known as National Socialism, was a far-right ideology in Nazi Germany led by Adolf Hitler. It was rooted in extreme nationalism and aimed to create a racially pure society based on the superiority of the Aryan race. Nazism incorporated elements of fascism, scientific racism, and anti-Semitism, and rejected liberal democracy. It sought to expand German territory and suppress "inferior" races. Neo-Nazism emerged after World War II, referring to similar far-right groups.

Liberalism: Liberalism is a political philosophy centered on individual rights, liberty, equality before the law, and consent of the governed. It supports private property, market economies, liberal democracy, and the rule of law. Liberals value freedom of speech, press, assembly, and religion. With roots in modern history, liberalism is often considered a dominant ideology.

Libertarianism: Libertarianism is a political philosophy that values individual freedom and autonomy. It emphasizes civil rights, equality before the law, and freedom of association, speech, thought, and choice. Libertarians are often critical of authority, state power, warfare, militarism, and nationalism. However, they diverge on their views of existing economic and political systems and the role of state and private power. Various categorizations distinguish libertarianism based on differing views on property and capital. Liberal ideas have influenced the development of libertarian thought.

Conservatism: Conservatism is a philosophy focused on preserving traditional institutions, customs, and values. It varies based on culture and seeks to promote institutions like the nuclear family, organized religion, the military, the nation-state, property rights, rule of law, aristocracy, and monarchy. Conservatives prioritize social order and historical continuity.

Nationalism: Nationalism is a movement that aims to align the nation with the state, advocating for self-governance and sovereignty. It emphasizes a nation's right to govern itself and rejects external interference. Nationalism seeks to establish a unified national identity based on shared characteristics and history, fostering national unity. It can be classified into ethnic nationalism and civic nationalism.

Patriotism: Patriotism is a deep affection, loyalty, and sense of belonging towards one's country. It includes love for the language, culture, history, and political aspects of the homeland. It often aligns with civic nationalism, while occasionally incorporating cultural nationalism.

Christian democracy: Christian democracy is an ideology rooted in Christian values that addresses the modern challenges of society and politics. It draws upon Christian social teaching to guide its approach.

Social democracy: Social democracy is a social, political, and economic philosophy that advocates for democratic principles in both politics and the economy. It takes the form of a managed welfare capitalist system, with public ownership, interventionist economic policies, and a focus on promoting social equality.

Green politics: Green politics is a political ideology focused on building an environmentally sustainable society. It emphasizes nonviolence, social justice, and grassroots democracy. Originating in the 1970s, green parties have emerged worldwide and have achieved electoral success in several countries.

Multiculturalism: Multiculturalism refers to the coexistence of different ethnic and cultural groups in a society. It can describe a diverse community with various traditions or a country with multiple cultural backgrounds. It is often used interchangeably with ethnic and cultural pluralism. Indigenous and settler-descended groups frequently receive attention in multicultural contexts.

Islamism: Islamism is a religio-political ideology aiming to implement a strict interpretation of Islam in society or state. Islamists are affiliated with Islamic institutions and social movements and emphasize the imposition of sharia, pan-Islamic unity, establishment of Islamic states, and rejection of non-Muslim influences, particularly from the West.

Populism: Populism refers to political stances emphasizing "the people" versus "the elite." It is often associated with anti-establishment and anti-political sentiment. The term emerged in the late 19th century and has been used to describe different politicians, parties, and movements. However, some scholars argue against its usage altogether due to conflicting definitions within political science and other social sciences.

War: War is a violent conflict between nations, governments, societies, or groups, involving intense fighting and death. It can involve regular or irregular forces and leads to widespread destruction. Warfare encompasses the activities and characteristics of different types of wars. Total war causes significant harm to civilians and non-combatants, going beyond legitimate military targets, resulting in extensive suffering and casualties.

Casualty (person): A military casualty refers to a person in military service who becomes unable to continue their duties due to various circumstances, like death, injury, illness, capture, or desertion.

Conscription: Conscription is the mandatory enlistment of people in a national service, typically military. It has been practiced since ancient times and persists in some countries today. It was popularized during the French Revolution in the 1790s, leading to the establishment of large military forces. Many European nations later adopted similar systems, where men would serve a set period on active duty before transitioning to the reserve force.

Desertion: Desertion in the military refers to unauthorized abandonment of duty or post, done with the intention of not returning. It is distinct from temporary absences such as unauthorized absence or absence without leave.

Duel: A duel is a pre-arranged combat between two individuals who fight with matching weapons.

Militarism: Militarism refers to the belief or desire of a government or people to have a strong military and use it aggressively to further national interests. It can involve glorifying the military and the ideals of a professional military class, with the armed forces dominating state administration and policies.

Prisoner of war: A prisoner of war (POW) is someone held captive by a belligerent power during or after armed conflict. The term dates back to 1610.

Refugee: A refugee is someone who has lost protection from their home country and cannot or won't return due to fear of persecution. They can be referred to as an asylum seeker until granted refugee status by a contracting state or the UNHCR, after making an asylum claim.

War crime: A war crime refers to a violation of laws during warfare, leading to criminal responsibility for combatants. It includes acts like killing civilians and prisoners, torture, destroying civilian property, sexual violence, pillaging, and intentionally committing mass killings such as genocide. War crimes also involve ignoring surrender, conscripting children, and disregarding proportionality and military necessity.

Genocide: Genocide is deliberate and systematic extermination of a people, targeting their entire population or a significant part.

Civil war: A civil war is a conflict between organized groups within one state, with goals ranging from obtaining control of the country or a region, to gaining independence or altering government policies. The term originates from the Latin phrase "bellum civile," which referred to the Roman Republic's civil wars in the 1st century BC.

Counterinsurgency: Counterinsurgency refers to actions taken by a state against non-state irregular forces such as guerrillas or revolutionaries. It involves both military and political measures aimed at defeating these forces. Counterinsurgency campaigns have been fought throughout history, but modern strategies were developed during decolonization.

Ethnic conflict: An ethnic conflict is a clash between multiple ethnic groups, arising from political, social, economic, or religious reasons. The distinguishing characteristic of ethnic conflicts is that the involved parties specifically strive for their ethnic group's status within society, setting it apart from other forms of contention.

Insurgency: Insurgency is a type of violent rebellion involving small, lightly armed groups using guerrilla tactics from rural areas against a larger authority. Its main characteristic is asymmetry, where irregular forces face a well-equipped military. Insurgents avoid large battles and instead integrate with civilians to gradually gain control and expand their forces. The collaboration with local populations is often crucial in these conflicts.

Invasion: An invasion is a large-scale military offensive where combatants from one entity enter territory controlled by another, with objectives such as conquest, liberation, or altering government. It can cause or end a war and is usually strategically planned and executed.

Religious war: A religious war or holy war is primarily caused by differences in religion and beliefs. It often sparks debates on whether religion is the main factor or if other aspects like economic or ethnic issues play a larger role. The extent to which a war is considered religious depends on the definitions used and the applicability of religion to war. Answers to these questions influence conclusions on the prevalence of religious wars compared to other types of conflicts.

Terrorism: Terrorism is the deliberate use of violence and fear to accomplish political or ideological goals. It involves intentional violence against civilians during times of peace or in war. There are many definitions of terrorism, and a consensus on its exact meaning has not been reached.

Aerial warfare: Aerial warfare refers to the use of military aircraft and flying machines in warfare. It encompasses bombers targeting enemy facilities, troops, and strategic sites, fighter aircraft competing for control of the airspace, and attack aircraft providing close air support to ground targets. It also involves naval aviation targeting sea and nearby land objectives, using gliders, helicopters, and other aircraft to transport airborne forces like paratroopers. Aerial refueling tankers extend operational time and range, while military transport aircraft move cargo and personnel.

Anti-aircraft warfare: Anti-aircraft warfare, or AA, refers to the measures taken to neutralize hostile air action. It encompasses various weapon systems, sensors, and arrangements to protect naval, ground, and air forces. The main focus is typically on homeland defense, with NATO referring to counter-air for airborne defense and anti-aircraft warfare for naval defense. Missile defense and intercepting projectiles in flight are also considered part of air defense.

Armoured warfare: Armoured warfare refers to the use of armoured fighting vehicles in modern warfare. It plays a vital role in contemporary military tactics, emphasizing the ability of troops to break through enemy defensive lines by utilizing armoured units and strategic manoeuvres.

Espionage: Espionage is the act of obtaining secret information, usually done by spies or espionage agents. It can be carried out by individuals, spy rings, or groups working for a government, company, criminal organization, or independent operation. Espionage is often done clandestinely, but can be both legal and illegal depending on the circumstances.

Naval warfare: Naval warfare is combat at sea, including oceans, lakes, or rivers. It has been practiced for over 3,000 years.

Siege: A siege is a military blockade of a city or fortress aimed at conquering it through attrition or assault. It involves one party holding a strong, defensive position resulting in low-intensity conflict. Negotiation between combatants is common due to proximity and fluctuating advantage, fostering diplomacy.

Sniper: A sniper is a highly trained and stealthy marksman who engages targets from concealed positions or at long distances beyond the target's detection capabilities. They use high-precision rifles and optics, often serve as scouts, and provide tactical information to their units or command headquarters.

Trench warfare: Trench warfare is a form of land combat characterized by military trenches, providing protection from small arms fire and artillery. It became prevalent during World War I, particularly on the Western Front, starting in September 1914 during the Race to the Sea.

Military: A military, or armed forces, is a well-equipped and structured force primarily for warfare. It is authorized by a state, with members identifiable by a uniform. Militaries can have multiple branches like army, navy, air force, etc. Their main purpose is to defend the state and its interests against external threats.

Military education and training: Military education and training enhances the skills and abilities of military personnel. It involves both voluntary and compulsory training, starting with recruit training and advancing to specialized education. Additional training can be provided throughout a military career. The instructional staff at military training institutions are known as directing staff.

Military–industrial complex: The military-industrial complex refers to the connection between a country's military and defense industry, which influences public policy. Both sides benefit, with the military obtaining weapons and defense corporations being paid to supply them. This term is often used in relation to the United States, where close links exist between defense contractors, the Pentagon, and politicians. The concept gained popularity after U.S. President Dwight D. Eisenhower warned about its detrimental effects in his farewell address.

Military science: Military science is the study of military processes, institutions, and warfare. It focuses on theory, method, and practice of producing military capability in line with defense policy. It identifies elements necessary for military advantage and victory. Military scientists include theorists, researchers, designers, and military personnel.

Operational level of war: The operational level of war is the level of command in military theory that links tactical details to strategic goals.

Military strategy: Military strategy is the implementation of ideas by military organizations to achieve strategic goals. It involves planning and conducting campaigns, positioning forces, and deceiving the enemy. The term originated from the Greek word strategos and was initially viewed as the art of arranging troops.

Military tactics: Military tactics involve organizing and utilizing fighting forces near the battlefield. They utilize four functions: firepower, mobility, protection, and shock action. Tactics are distinct from command and control and logistics. They are the lowest level of warfighting, with strategic and operational levels above them. Over time, the dominance of tactical functions shifts based on military technology, often accompanied by the prominence of a specific fighting arm like infantry or tanks.

Army: An army is a land-based armed force that primarily fights on land. It is the land-based military branch of a nation and may include aviation assets. The term 'army' can also refer to a field army within a national military force.

Cavalry: Cavalry refers to mounted soldiers who fight on horseback and were historically the most mobile combat unit. They served as light cavalry for reconnaissance and screening, or as heavy cavalry for decisive shock attacks in different armies. Cavalry soldiers had various designations based on tactics and era. The term does not include other animal-mounted forces like camel or elephant riders. In the early 17th to early 18th century, infantry on horseback but fighting on foot were called dragoons, which later evolved into standard cavalry.

Infantry: Infantry refers to military personnel specialized in ground combat on foot. It encompasses various types such as light, heavy, mountain, motorized, mechanized, airborne, air assault, and naval infantry. Some types like line and mounted infantry were popular in the past but declined in use due to advancements in weaponry.

Militia: A militia is a non-professional fighting organization made up of part-time soldiers who are citizens or subjects of a country. They serve during times of need and support regular troops through skirmishes, fortifications, and irregular warfare. However, they are generally unable to hold ground against regular forces and are limited by local civilian laws to serve only in their home region and for a limited time. Militias can serve as a source of manpower for regular forces in emergencies.

Navy: A navy is a branch of a nation's armed forces specialized in naval warfare, including combat operations on lakes, rivers, coasts, and oceans. It encompasses surface ships, submarines, amphibious ships, and seaborne aviation, along with support, training, and communication activities.

Air force: An air force is a branch of a nation's military that specializes in aerial warfare. It conducts strategic and tactical bombing missions, gains control of the air, and provides aerial reconnaissance and close air support to land and naval forces.

Soldier: A soldier is a member of an army and can be either a conscripted or volunteer enlisted person, non-commissioned officer, warrant officer, or officer.

Military reserve: A military reserve is a group of soldiers or units held back by commanders to address unforeseen situations or seize sudden opportunities during a battle. They can defend against enemy attacks, reinforce troops in battle, or relieve fatigued soldiers. Reserves depend on the level of uncertainty about the enemy's intentions and can be categorized as tactical, operational, or strategic reserves.

Battle: A battle is a defined military engagement between opposing military units, occurring within the context of a war. It involves combat and can vary in scale. Skirmishes are smaller engagements with limited commitment and inconclusive outcomes.

Blockade: A blockade is a military strategy that actively stops a country or region from sending or receiving food, supplies, weapons, communication, and occasionally people. It is not the same as an embargo or sanction, as it physically obstructs trade rather than imposing legal barriers. Unlike a siege, which targets specific fortresses or cities, a blockade applies to an entire area for various objectives, not necessarily aiming to conquer the region.

Military exercise: A military exercise, also known as a training exercise or war game, involves using military resources to simulate combat scenarios and test tactics and strategies. These exercises help explore the effects of warfare without actual combat and ensure the combat readiness of forces before deployment.

Peacekeeping: Peacekeeping refers to military actions aimed at establishing conditions that support long-lasting peace. It has been shown to decrease civilian and military casualties, along with minimizing the chances of renewed conflict.

Military organization: A military organization is the structure of a state's armed forces to provide necessary defense capabilities. Some countries include paramilitary forces, while others do not consider them as part of the military. Non-military armed forces, like insurgent groups, often imitate military structures. Formal military organizations typically follow hierarchical forms.

Staff (military): A military staff is a group of officers, enlisted personnel, and civilians who assist the commander of a large military unit in planning, analysis, and information gathering. They coordinate and supervise the execution of plans and orders, and facilitate communication between commanders and other stakeholders. The staff is organized into functional groups like administration, logistics, operations, and intelligence. A centralized staff provides tighter control but requires larger headquarters, while a decentralized staff enhances situational focus, personal initiative, and speed of action.

Military rank: Military ranks are a hierarchical system that determines authority and responsibility within armed forces and other military-like institutions. They establish dominance and define the chain of command, which is crucial for organized collective action.

Officer (armed forces): An officer is a high-ranking person in the armed forces or uniformed services, who holds a position of authority.

Communication: Communication is the transmission of information and its definition is debated. Unintentional or failed transmissions may or may not be included. Communication can both transmit and create meaning. Models simplify communication into main components such as a source, coding system, message, channel, and receiver. Communication studies is the main field of inquiry for understanding communication.

Nonverbal communication: Nonverbal communication (NVC) is the transmission of messages through nonverbal cues such as eye contact, body language, touch, voice, physical environments, and use of objects. It started being studied in 1872 by Charles Darwin, who recognized that animals also communicate nonverbally. Today, scholars believe that nonverbal communication often conveys more meaning than verbal communication.

Body language: Body language is non-verbal communication using physical behaviors like facial expressions, body posture, gestures, eye movement, touch, and space. It applies to both humans and animals and is also known as kinesics. Despite being unconsciously done, body language plays a significant role in communication.

Propaganda: Propaganda is communication aimed at influencing an audience for a specific agenda, often by selectively presenting facts, using loaded language, or evoking emotional responses. It is found in diverse contexts.

Public relations: Public relations (PR) is the strategic management of information by an individual or organization to shape public perception. It differs from publicity as PR is internally controlled, while publicity is contributed by external parties. PR involves gaining exposure through topics of public interest without direct payment, primarily through media. It aims to obtain free coverage (earned media) rather than paid advertising. In the modern era, advertising has become part of PR activities.

Rhetoric: Rhetoric is the art of persuasion, studied within the humanities. It explores techniques used by speakers and writers to inform, persuade, and motivate audiences. Additionally, it provides strategies for understanding, discovering, and developing arguments in various situations.

Culture: Culture refers to the social behavior, institutions, and norms in society, as well as the knowledge, beliefs, arts, laws, customs, capabilities, and habits of individuals. It is often associated with specific regions or locations.

Body modification: Body modification refers to intentionally changing the appearance or anatomy of the human body. It encompasses activities like tattooing, accepted forms of body decoration, religious ceremonies, and the modern primitive movement.

Body piercing: Body piercing is a form of body modification where a part of the body is punctured or cut to create an opening for jewelry or implants. It can alter the body's appearance and has been practiced since ancient times worldwide. While it can be done on people of all ages, minors are usually limited to earlobe piercings.

Circumcision: Circumcision is a surgical procedure that removes the foreskin from the penis. It is commonly done as a preventive measure, for religious or cultural reasons, or to treat certain conditions like phimosis and chronic UTIs. Anesthesia is used to reduce pain. However, it is not recommended for individuals with genital abnormalities or poor overall health.

Female genital mutilation: Female genital mutilation (FGM) refers to the ritual cutting or removal of some or all of the vulva. It is practiced in certain countries in Africa, Asia, and the Middle East, as well as among their diaspora populations. As of 2023, UNICEF estimates that at least 200 million girls in 31 countries, including Indonesia, Iraq, Yemen, and 27 African countries including Egypt, have undergone various forms of FGM.

Tattoo: A tattoo is a design made by inserting ink into the skin that dates back to ancient times. It is a form of body modification practiced worldwide with various techniques, including traditional and modern methods. Tattoos carry different meanings and significance depending on culture and location.

Cultural assimilation: Cultural assimilation is when a minority group adopts the values, behaviors, and beliefs of the dominant society to resemble it partially or fully.

Popular culture: Popular culture is the prevailing practices, beliefs, artistic expressions, and objects in a society. It influences the activities and emotions resulting from interaction with these dominant elements. Media, mass appeal, marketing, and capitalism drive popular culture, particularly in Western societies, and it is produced by the "culture industry" as coined by philosopher Theodor Adorno.

Tradition: Tradition is a set of beliefs or behaviors passed down within a group with symbolic meaning and origins in the past. It includes cultural expressions like holidays and unique clothing, and can also refer to social norms and greetings. Traditions can last for thousands of years, and the word itself means to transmit or hand over. Some traditions are intentionally invented for political or cultural reasons. The term is used differently in various academic disciplines.

Oral tradition: Oral tradition is a method of communication where knowledge, art, ideas, and cultural material are shared orally across generations. This includes folktales, ballads, chants, and more. It allows societies to transmit history, literature, law, and other knowledge without a writing system or alongside it. Religions like Buddhism, Hinduism, Catholicism, and Jainism have utilized oral tradition to pass down their scriptures, rituals, hymns, and myths.

Greeting: A greeting is a communication act where people intentionally acknowledge each other to indicate a social relationship. Greetings occur before conversations or when individuals pass each other. They vary across cultures depending on social status and relationship, being present universally. Greetings can be expressed verbally or physically and even in written communications like letters or emails.

Taboo: Taboo refers to a social group's ban or avoidance of something deemed repulsive, offensive, sacred, or restricted to specific individuals. It is prevalent in all societies and can be explicit through laws or religion, or implicit through cultural norms and conventions.

Human cannibalism: Human cannibalism refers to the act of humans consuming the flesh or organs of other humans. Those who engage in this practice are known as cannibals. The term has also been used in zoology to describe animals eating members of their own species as food.

Birthday: A birthday is the yearly celebration of a person's birth or achievements. It is commemorated in various cultures through gift-giving, cards, parties, and ceremonial events.

Festival: A festival is a special event celebrated by a community, focusing on their religion or culture. It is often a local or national holiday and can show the interconnection between high and low cultures. Festivals have diverse origins, including agriculture, and many are associated with harvest time. They blend religious commemoration and gratitude for good harvests, often taking place in autumn. Examples include Halloween in the northern hemisphere and Easter in the southern.

Carnival: Carnival is a Christian festival held before Lent, typically in February or March. It involves public celebrations with parades, street parties, and circus-like entertainment. Participants wear elaborate costumes and masks, fostering social unity and a sense of escapism. Excessive consumption of alcohol and indulgent foods is common before the upcoming period of fasting. This festival is a time of great indulgence, marked by overeating and various indulgent activities. It concludes with the consumption of pancakes, donuts, and desserts before Lent begins. Lent involves reduced consumption of dairy and animal products, along with personal sacrifices.

Diwali: Diwali is a Hindu festival symbolizing the triumph of light over darkness, good over evil, and knowledge over ignorance. Celebrated from mid-September to mid-November, it lasts for about five or six days and is observed by various Indian religions.

Harvest festival: A harvest festival is a yearly celebration held during the main harvest of a particular region. It takes place at different times and locations worldwide due to climate and crops variations. These festivals commonly involve family and public feasting with food sourced from the harvested crops.

Holi: Holi is a major Hindu festival known as the Festival of Colours, Love, and Spring. It commemorates the love between the deities Radha and Krishna and symbolizes the triumph of good over evil. Originating in the Indian subcontinent, Holi has spread to other parts of Asia and the Western world through the Indian diaspora.

World's fair: A world's fair, also called a universal exhibition or expo, is a large global showcase of a nation's achievements. Held in various locations worldwide for a period of 3-6 months, it highlights different cultures and technologies.

Holiday: A holiday is a day or time dedicated to festivals or recreation. Public holidays are set by authorities and vary by region. Religious holidays are observed by specific religious groups and often become public holidays. Some religious holidays, like Christmas, have become secularized. Many holidays have also become commercialized due to industrial growth.

Sabbath: The Sabbath, also known as Shabbat, is a day of rest and worship in Abrahamic religions. It is observed on the seventh day according to the Book of Exodus, following the commandment to keep it holy. This practice traces back to God's rest after creation.

Halloween: Halloween, also known as Hallowe'en, is celebrated on October 31 and marks the eve of All Hallows' Day. It is part of the Allhallowtide observance, dedicated to remembering the dead, including saints and martyrs. Additionally, Halloween has become a popular cultural celebration of horror and the supernatural.

New Year: The New Year marks the beginning of a new calendar year and is celebrated in various cultures. It occurs on January 1 in the Gregorian, Julian, and Roman calendars.

New Year's Day: New Year's Day, on 1 January, marks the start of the calendar year in the Gregorian calendar. Solar calendars typically coincide with the winter solstice, whereas lunisolar or lunar calendars celebrate their Lunar New Year at varying points in relation to the solar year.

Nowruz: Nowruz is a globally celebrated spring festival that originated in Zoroastrianism. It occurs around 21 March, following the Iranian Solar Hijri calendar and marks the beginning of spring. Various ethnic groups partake in this tradition.

Christmas: Christmas is an annual festival celebrating the birth of Jesus Christ, observed on December 25 by billions worldwide. It is a religious and cultural event, including a feast central to Christianity's liturgical year. Christmas Day is a public holiday, celebrated by Christians and non-Christians alike, and marks the beginning of a twelve-day period called Christmastide.

Easter: Easter, also known as Pascha or Resurrection Sunday, is a Christian festival celebrating the resurrection of Jesus, which occurred three days after his crucifixion. It concludes the Passion of Jesus Christ, following a 40-day period of fasting and penance called Lent.

Pentecost: Pentecost is a Christian holiday occurring 50 days after Easter. It marks the descent of the Holy Spirit on Mary, the Apostles, during their celebration of the Feast of Weeks in Jerusalem, according to the Acts of the Apostles.

Chinese New Year: Chinese New Year, also known as the Spring Festival, is a traditional lunisolar festival that celebrates the start of a new year on the Chinese calendar. It marks the end of winter and the beginning of spring, and is observed from New Year's Eve to the Lantern Festival. The festival begins on the new moon between January 21 and February 20.

Ramadan: Ramadan is the ninth month of the Islamic calendar and is observed by Muslims worldwide. It is a month of fasting, prayer, reflection, and community. It commemorates Muhammad's first revelation and is considered one of the Five Pillars of Islam. Ramadan lasts for twenty-nine to thirty days, starting with the sighting of the crescent moon.

Eid al-Fitr: Eid al-Fitr is a major Islamic holiday that marks the end of Ramadan, a month of fasting. It is celebrated worldwide by Muslims and falls on the first day of Shawwal in the Islamic calendar. The date varies based on the sighting of the new moon. Also known as Lesser Eid, it is a time for feasting and is considered one of the two official holidays in Islam.

Passover: Passover, also known as Pesach, is a significant Jewish holiday commemorating the Israelites' liberation from slavery in Egypt. It is one of the three annual pilgrimage festivals and begins on the 15th day of the Hebrew month of Nisan. The holiday lasts for seven days in Israel and eight days in the Jewish diaspora. Passover involves the Passover Seder, a ritual meal, and the Feast of Unleavened Bread. Additionally, the Hebrew day starts and ends at sunset, so the holiday begins at sunset the day prior. The term "Pesach" can also refer to the paschal lamb offering or the biblical feast of unleavened bread.

Rosh Hashanah: Rosh Hashanah is the Jewish New Year, also known as Yom Teruah. It marks the start of the Jewish High Holy Days. It is a time of penitence and reflection, leading up to the important day of Yom Kippur. Rosh Hashanah kicks off a series of autumnal religious festivals including Sukkot, Shemini Atzeret, and Simchat Torah.

Yom Kippur: Yom Kippur is the holiest day in Judaism and Samaritanism, celebrated on the 10th of Tishrei, usually in late September or early October.

Education: Education is the transfer of knowledge, skills, and values, occurring in various forms. It encompasses formal education within institutions like schools, non-formal education outside schools, and informal learning through everyday experiences. Education is classified into levels such as early childhood, primary, secondary, and tertiary education. It can be teacher-centered or student-centered, and focused on specific subjects like science, language, or physical education. The term "education" can also refer to the traits and mental states of educated individuals, and the field that studies educational phenomena.

Early childhood education: Early childhood education (ECE), or nursery education, focuses on teaching children from birth to eight years old. It is a crucial period in their development and is traditionally defined up to the third grade.

Primary education: Primary education refers to the initial formal education that takes place after preschool/kindergarten and before secondary school. It is provided in primary schools, elementary schools, or first schools and middle schools depending on the location. In certain countries, including the UK, the term primary is used instead of elementary.

Secondary education: Secondary education refers to the second and final phase of basic education, following six years of primary education. It is typically compulsory until the age of 16 and can encompass both lower secondary (age 12) and upper secondary (before tertiary education) levels. While the aim of providing basic education is universal, each country has its unique systems and terminology. After secondary education, individuals can pursue higher education, vocational education, or enter the workforce.

College: A college is an educational institution that can be a standalone degree-awarding university or part of another institution. It can offer vocational and further education, or even function as a secondary school.

Curriculum: A curriculum is a broad term for all student experiences in education. It can refer to a planned sequence of instruction or the educator's goals. It includes the interaction between students and instructional content, as well as evaluating educational objectives. Curricula are divided into explicit, implicit, excluded, and extracurricular categories.

Learning: Learning is the acquisition of new understanding, knowledge, skills, and behaviors. Humans, animals, and some machines possess the ability to learn, while certain plants also show evidence of learning. It can be immediate or accumulate through repeated experiences. Learning often has long-lasting effects and differentiating between forgotten and unretrievable knowledge is difficult.

Skill: A skill is a learned ability to achieve specific outcomes effectively and efficiently. It can be divided into general and job-specific skills. General skills include time management, teamwork, leadership, and self-motivation, while job-specific skills are tailored to a particular job. Skills are assessed based on environmental stimuli and situations.

Library: A library is a collection of books and other materials accessible to members and allied institutions. It provides physical and digital resources, often including printed materials for borrowing and reference materials for in-house use. Libraries may also offer a variety of media formats, such as films, television programs, music recordings, etc. in DVDs, Blu-rays, CDs, cassettes, or microformats. Additionally, they provide access to information and content stored in bibliographic databases.

School: A school is an educational institution providing learning spaces for students under the guidance of teachers. It can be government or privately operated, with primary schools for young children and secondary schools for teenagers. Higher education is typically offered in university colleges or universities. Schooling is often compulsory in many countries.

Boarding school: A boarding school is a residential institution where students live and receive formal education. The term "boarding" refers to lodging and meals provided. Boarding schools have a long history and are found in various countries, with diverse rules, values, and practices. In these schools, students study and live together throughout the school year, and some institutions also admit day students who commute.

Exam: An exam is an assessment to measure a person's knowledge, skills, or aptitude in various subjects. It can be conducted verbally, on paper, on a computer, or in a specific area where the test taker must showcase their abilities.

University: A university is a research-based institution that grants academic degrees in multiple disciplines, including undergraduate and postgraduate programs.

Library of Alexandria: The Library of Alexandria, located in Alexandria, Egypt, was an ancient world's prominent and expansive research institution dedicated to the Muses. It might have been proposed by Demetrius of Phalerum to Ptolemy I Soter, but was likely built during the reign of Ptolemy II Philadelphus. Known for its vast collection of papyrus scrolls, the library had an estimated 40,000 to 400,000 scrolls at its peak.

Library of Congress: The Library of Congress (LOC) is the research library and national library of the United States, serving as the library and research service for the U.S. Congress. Established in 1800, it is the oldest federal cultural institution in the country. The library is located in Washington, D.C., occupying three buildings on Capitol Hill, with a conservation center in Culpeper, Virginia. It is one of the largest libraries globally, housing around 173 million items and employing over 3,000 people. The library's collections are diverse, spanning various subjects, formats, and languages, encompassing research materials from across the world.

New York Public Library: The New York Public Library (NYPL) is the second-largest public library in the United States with 92 locations and nearly 53 million items. It operates as a private, nonprofit corporation with both private and public financing.

National Library of China: The National Library of China, located in Beijing, is one of the largest libraries globally. With over 41 million items, it holds the largest collection of Chinese literature and historical documents in the world. It spans 280,000 square meters and is a public institution sponsored by the Ministry of Culture and Tourism.

British Library: The British Library in London is the national library of the UK and one of the biggest libraries globally. It houses a vast collection of approximately 170-200 million items from various countries. Being a legal deposit library, it receives copies of all UK and Irish published books and a significant number of overseas titles distributed in the UK. The library is sponsored by the Department for Culture, Media and Sport and serves as a non-departmental public body.

Bibliothèque nationale de France: The Bibliothèque nationale de France is the national library of France, with two main sites in Paris: Richelieu and François-Mitterrand. It houses all publications and has a museum displaying valuable books, manuscripts, artworks, and objects.

Russian State Library: The Russian State Library, situated in Moscow, is the largest library in Russia, Europe, and among the biggest worldwide. With over 47 million units, it houses a vast collection. It operates under the Ministry of Culture's oversight and fiscal jurisdiction.

Vatican Library: The Vatican Library, also known as the Vatican Apostolic Library or the Vat, is the national library of the Holy See in Vatican City. Established in 1475, it is one of the oldest and most significant libraries globally. With over 75,000 historical codices and 1.1 million printed books, including 8,500 incunabula, it holds a remarkable collection of historical texts.

Al-Azhar University: Al-Azhar University in Cairo, Egypt, is a prestigious public university associated with Al-Azhar Al-Sharif. It is the oldest university in Egypt and renowned for Islamic learning. Besides higher education, it supervises a network of schools with around two million students. Additionally, it is affiliated with over 4,000 teaching institutes in Egypt (as of 1996).

University of Toronto: The University of Toronto is a prestigious public research university located in Toronto, Ontario, Canada. It was established in 1827 as King's College and became a secular institution in 1850. With 11 autonomous colleges, it offers a diverse range of academic programs. The university maintains three campuses, including St. George in downtown Toronto, alongside satellite campuses in Scarborough and Mississauga.

National Autonomous University of Mexico: The National Autonomous University of Mexico (UNAM) is a prestigious public research university known for its rigorous admissions and global recognition in education and research. It boasts a UNESCO World Heritage site campus designed by famous Mexican architects and painters. UNAM hosted major events during the 1968 Summer Olympic Games. All Mexican Nobel laureates are affiliated with UNAM. It was founded in 1910 as a secular alternative to the Royal and Pontifical University of Mexico and was the birthplace of the student movement in 1968.

California Institute of Technology: Caltech, a renowned private research university in Pasadena, California, is dedicated to the advancement of pure and applied sciences. It has a remarkable history of innovation and is globally recognized as one of the most prestigious institutes of technology.

University of Chicago: The University of Chicago is a renowned private research university located in the Hyde Park neighborhood of Chicago, Illinois, USA.

Johns Hopkins University: Johns Hopkins University, founded in 1876, is a prestigious private research university located in Baltimore, Maryland. It was the first U.S. university to adopt the European research institution model.

Massachusetts Institute of Technology: MIT, established in 1861, is a prestigious private land-grant research university in Cambridge, Massachusetts. With a rich history, it has been instrumental in the advancement of various fields of technology and science.

Columbia University: Columbia University, a prestigious Ivy League research institution in NYC, was founded in 1754 as King's College. It is the oldest higher education institution in New York and the fifth-oldest in the US, located near Trinity Church.

Harvard University: Harvard University, founded in 1636, is a prestigious private Ivy League research university in Cambridge, Massachusetts. It is the oldest higher learning institution in the US and was named after its first benefactor, John Harvard. Renowned for its influence, wealth, and rankings, Harvard is considered one of the most prestigious universities worldwide.

Princeton University: Princeton University is a prestigious Ivy League research university in Princeton, New Jersey. Established in 1746 as the College of New Jersey, it is one of the oldest higher education institutions in the US. After relocating to Newark and then settling in its current campus, it gained university status in 1896 and adopted the name Princeton University.

Yale University: Yale University, founded in 1701, is a prestigious, private Ivy League research university in New Haven, Connecticut. It is the third-oldest higher education institution in the US and one of the nine colonial colleges chartered before the American Revolution.

University of California, Berkeley: The University of California, Berkeley is a prominent public research university in Berkeley, California. Founded in 1868, it is the first land-grant university in the state and the flagship campus of the University of California system. Noted for its top-ranked departments, Berkeley has produced numerous successful companies through its undergraduate alumni. Additionally, it holds the fourth highest number of Nobel Prize affiliations among academic and research institutions.

Stanford University: Stanford University is a prestigious private research institution located in Stanford, California. Its sprawling campus spans over 8,180 acres, making it one of the largest in the US. With over 17,000 students, Stanford University offers a top-notch educational experience.

Peking University: Peking University, located in Beijing, China, is a prestigious public university. It receives funding from the Ministry of Education and is affiliated with Project 211 and Project 985, as well as the Double First-Class Construction program.

Tsinghua University: Tsinghua University is a prestigious public university in Beijing, China. It is backed by the Ministry of Education and recognized under various influential initiatives including Project 211, Project 985, and Double First-Class Construction.

Indian Institutes of Technology: IITs are renowned engineering and technology institutions in India since 1950. They are under the ownership of the Ministry of Education and declared Institutes of National Importance. There are currently 23 IITs operating autonomously, linked through the IIT Council. The Minister of Education is its chairperson.

Kyoto University: Kyoto University, also known as KyotoU, is a prestigious national research university in Japan. It was established in 1897 and is one of the former Imperial Universities. As the second oldest university in Japan, KyotoU is renowned for its academic excellence and contribution to research.

University of Tokyo: The University of Tokyo, founded in 1877, is Japan's oldest modern public research university, located in Bunkyō, Tokyo. It emerged from the merger of various pre-westernisation era institutions and remains a prestigious educational institution in the country.

University of Copenhagen: The University of Copenhagen is a Danish public research university, founded in 1479. It is the second-oldest university in Scandinavia after Uppsala University.

University of Vienna: The University of Vienna is a historic public research university in Vienna, Austria, founded in 1365 by Duke Rudolph IV. It holds the title of the oldest university in the German-speaking world and is one of Europe's largest higher learning institutions. Renowned for its academic excellence, the university has been associated with 16 Nobel Prize laureates and has played host to numerous influential scholars throughout history.

University of Paris: The University of Paris, also called the Sorbonne, was the prominent university in Paris, France from 1150 to 1970. It emerged in 1150, making it the second-oldest university in Europe.

Humboldt University of Berlin: Humboldt University of Berlin is a research university in Berlin, Germany, known for its public status and central location in the Mitte borough.

University of Göttingen: The University of Göttingen, founded in 1734, is a public research university in Göttingen, Germany. It was established to promote Enlightenment ideals and is the oldest university in Lower Saxony. With approximately 31,600 students, it is also the largest university in the state.

Heidelberg University: Heidelberg University, or Ruprecht Karl University, is a public research university in Heidelberg, Germany. It was founded in 1386, making it Germany's oldest university and one of the world's oldest surviving universities. It is also the third university established in the Holy Roman Empire. Since 1899, it has been coeducational.

Ludwig Maximilian University of Munich: The Ludwig Maximilian University of Munich, established in 1472, is a public research university in Munich, Germany. It is the sixth-oldest university in Germany and has a proud history of continuous operation.

University of Bologna: The University of Bologna, founded in 1088, is the oldest and one of the largest universities in Europe. It is a public research university located in Bologna, Italy. It was the first degree-awarding institution in the world and coined the term "universitas". With over 90,000 students, it has a rich history and is known for its motto "Alma Mater Studiorum".

Sapienza University of Rome: Sapienza University of Rome, established in 1303, is one of the world's oldest universities and the largest in Europe with 122,000 students. It is a renowned education and research center in Southern Europe, offering various campuses, libraries, and laboratories in Rome.

ETH Zurich: ETH Zurich, founded in 1854, is a renowned research university in Zürich, Switzerland. Its mission is to educate engineers and scientists. The university is known for its focus on science, technology, engineering, and mathematics, with 16 departments covering various disciplines.

University of Cambridge: The University of Cambridge is a public research university in Cambridge, England, founded in 1209. It is the third-oldest university in continuous operation worldwide and is often referred to as Oxbridge along with the University of Oxford. In 1231, it received a royal charter from King Henry III.

University of Oxford: The University of Oxford, founded in 1096, is the oldest university in the English-speaking world and the second-oldest globally. It is located in Oxford, England and is a renowned collegiate research institution. It experienced rapid growth after English students were prohibited from attending the University of Paris in 1167. Following conflicts with the local townspeople, some academics migrated to Cambridge in 1209, establishing the University of Cambridge. These two prestigious universities, collectively called Oxbridge, share several similarities.

Moscow State University: Moscow State University, located in Moscow, Russia, is a prominent public research university.

Anthropology: Anthropology is the scientific study of humans, encompassing behavior, biology, cultures, societies, and languages, both present and past. It includes social anthropology, which examines behavioral patterns, cultural anthropology, which explores cultural meaning and values, and linguistic anthropology, which studies the influence of language on social life. Additionally, biological anthropology analyzes the development of humans.

Biological anthropology: Biological anthropology (or physical anthropology) is a scientific discipline that studies the biological and behavioral aspects of humans, their extinct ancestors, and non-human primates from an evolutionary standpoint. It focuses on human biology and behavior from a biological perspective.

Linguistic anthropology: Linguistic anthropology is the study of how language affects society. It is an interdisciplinary field that emerged from documenting endangered languages and has since expanded to cover various aspects of language structure and usage.

Farmer: A farmer is involved in agriculture, raising crops and animals for food or materials. They may own or work on the land. In developed economies, a farmer is typically a farm owner, while workers are known as farm workers. In older definitions, a farmer was someone who promoted plant growth or raised animals through labor and attention.

Hunter-gatherer: A hunter-gatherer is a person living a traditional lifestyle, obtaining food by gathering from local sources and hunting. They rely on edible plants, insects, fungi, eggs, and game as sources of sustenance. Hunter-gatherer societies differ from sedentary agricultural societies that cultivate crops and rear domesticated animals for food production.

Nomad: Nomads are mobile communities who lack permanent settlement and frequently relocate. They encompass diverse groups like hunter-gatherers, trader nomads, tinkers, and pastoral nomads. However, the population of nomadic pastoral tribes has gradually declined over time, with an estimated 30–40 million nomads worldwide as of 1995.

Diaspora: A diaspora refers to a scattered population residing outside its original geographic location. It pertains to people who identify with a specific location but currently live elsewhere.

Ethnology: Ethnology is an academic discipline comparing and analyzing the characteristics of diverse peoples and their interrelationships.

Ethnicity: Ethnicity refers to a group of people who share distinctive characteristics, such as nationality, ancestry, traditions, language, history, society, religion, or social treatment. It is often used interchangeably with the term nation, particularly in cases of ethnic nationalism.

Ethnocentrism: Ethnocentrism is the act of using one's own culture as a basis to judge other cultures. It often involves negative judgment and the belief that one's own culture is superior. This includes language, behavior, customs, and religion. Ethnocentrism can also refer to any culturally biased judgment and can be observed in portrayals of different regions, like the Global South and the Global North.

Ethnography: Ethnography is a branch of anthropology that systematically studies individual cultures. It explores cultural phenomena from the viewpoint of the subjects being studied. As a type of social research, ethnography focuses on understanding the behavior of participants in specific social situations and their own interpretations of such behavior.

Indigenous peoples: Indigenous peoples are culturally distinct groups with a special connection to their traditional lands. They have experienced subjugation and discrimination under the dominant cultural model and commonly self-identify as Indigenous.

Self-determination: Self-determination is a crucial concept in international law, recognized by the United Nations. It asserts that people should have the freedom to determine their own political status and sovereignty without external interference, based on principles of equal rights and fair opportunity.

Arabs: The Arabs are an ethnic group primarily living in the Arab world in Western Asia and Northern Africa. They also have a notable presence in different parts of the world.

Bedouin: Bedouin refer to Arab nomadic tribes historically residing in desert regions across the Arabian Peninsula, North Africa, the Levant, and Mesopotamia. Originating in the Syrian and Arabian Deserts, they spread throughout West Asia and North Africa after Islam's arrival. The term "bedouin" means "desert dweller" in Arabic and distinguishes them from sedentary people (ḥāḍir). Bedouin occupy territories from North African deserts to Middle Eastern rocky areas, traditionally organized in tribes. They share a common culture of herding camels and goats and most practice Islam, with a few Christian Bedouins in the Fertile Crescent.

Austronesian peoples: The Austronesian peoples are a diverse group of people spread across Taiwan, Southeast Asia, Micronesia, Melanesia, Polynesia, and Madagascar, who speak Austronesian languages. They also include ethnic minorities in Vietnam, Cambodia, Myanmar, Thailand, Hainan, the Comoros, and the Torres Strait Islands. Collectively, their territories are known as Austronesia.

Jews: The Jews are an ethnoreligious group and nation descended from the Hebrews of the ancient Near East. They follow the religion of Judaism, which is intertwined with their ethnicity and community. Not all ethnic Jews practice Judaism, but those who formally convert are considered part of the community.

African Pygmies: African Pygmies are ethnic groups from Central Africa who live in the Congo Basin. They traditionally rely on a hunter-gatherer lifestyle. They are categorized into three main groups based on their geographic location: western Bambenga, eastern Bambuti, and central/southern Batwa. The Southern Twa are sometimes included under the term Pygmoid.

Bantu peoples: The Bantu peoples are a diverse group of around 400 African ethnic groups who speak Bantu languages. These languages are spoken across 24 countries in Central, Southeast, and Southern Africa. They encompass several hundred distinct languages, with an estimated 350 million speakers in the mid-2010s. The Democratic Republic of the Congo alone is home to about 60 million Bantu speakers, representing various ethnic and tribal groups.

Zulu people: The Zulu people, the largest ethnic group in South Africa, are native to Southern Africa. They belong to the Nguni ethnic group and are mainly concentrated in the province of KwaZulu-Natal, with an estimated population of 10-12 million.

Berbers: The Berbers, also known as Amazigh or Imazighen, are diverse indigenous ethnic groups in North Africa. They existed before the Arab migrations to the Maghreb and are connected through their use of Berber languages within the Afroasiatic language family. They live in scattered communities across Morocco, Algeria, Libya, Tunisia, Mauritania, Mali, Niger, Burkina Faso, and Egypt's Siwa Oasis.

Maasai people: The Maasai people are a Nilotic ethnic group living in Kenya and Tanzania near the Great Lakes region. They speak the Maa language, and although most also speak Swahili and English, some elders in rural areas may not.

San people: The San people, also known as Bushmen, are indigenous hunter-gatherers in southern Africa. They have the oldest surviving cultures in the region, with ancestral territories across Botswana, Namibia, Angola, Zambia, Zimbabwe, Lesotho, and South Africa. Their languages belong to the Khoe, Tuu, and Kxʼa families. The San are distinguished from neighboring pastoralists and more recent immigrants like the Khoekhoe, Bantu, Europeans, and Asians.

Yoruba people: The Yoruba people are a West African ethnic group, mainly found in Nigeria, Benin, and Togo. They constitute over 48 million people in Africa, with a significant presence outside the continent and among the African diaspora. Yoruba is one of the largest ethnic groups in Africa, comprising 20.7% of Nigeria's population. They primarily reside in Yorubaland and speak the Yoruba language, which has the highest number of native speakers in the Niger-Congo language family.

Indigenous peoples of the Americas: The Indigenous peoples of the Americas are the original inhabitants of the region before European colonization. They include various ethnic groups who still identify with their ancient heritage.

Inuit: Inuit are culturally and historically similar Indigenous peoples living in the Arctic and subarctic regions of North America, Greenland, Labrador, Quebec, Nunavut, the Northwest Territories, Yukon, Alaska, and Chukotka Autonomous Okrug, Russia. They speak Inuit languages, a part of the Eskimo-Aleut language family, and use Inuit Sign Language in Nunavut, which is critically endangered.

Maya peoples: The Maya are indigenous peoples of Mesoamerica, known for their ancient civilization. Today, they reside in southern Mexico, Guatemala, Belize, El Salvador, Nicaragua, and Honduras. The term "Maya" is a modern collective name for these people, although they did not historically use it themselves. There was no shared identity or political unity among the different Maya groups, as they each had their own unique traditions, cultures, and histories.

Quechua people: The Quechua people are indigenous to South America and speak the Quechua languages, which originated in Peru. While most Quechua speakers are from Peru, there are also significant populations in Ecuador, Bolivia, Chile, Colombia, and Argentina.

Cherokee: The Cherokee are Indigenous people of the Southeastern Woodlands. They lived in towns along river valleys in parts of North Carolina, Tennessee, Virginia, South Carolina, Georgia, and Alabama.

Iroquois: The Iroquois, also known as the Five Nations or Six Nations, were a confederacy of Native Americans and First Nations in Northeast North America and Upstate New York. They spoke Iroquoian languages and formed a powerful alliance. Initially, French called them the "Iroquois League" and later the "Iroquois Confederacy," while the English referred to them as the "Five Nations." The Mohawk, Oneida, Onondaga, Cayuga, and Seneca were the original five nations, and later the Tuscarora joined to make it the Six Nations.

Navajo: The Navajo are indigenous people from the US Southwest.

Sioux: The Sioux, also known as the Oceti Sakowin, are Native American tribes from the Great Plains. They consist of the Dakota and Lakota people and are collectively referred to as the Seven Council Fires. The term "Sioux" is derived from the Ojibwe term "Nadowessi". It can be used to describe any ethnic group within the Great Sioux Nation or any of their various language dialects.

Adivasi: The Adivasi are tribal groups in the Indian subcontinent, with a heterogeneous identity. The term was created in the 1930s to give tribal people an indigenous identity. It is also used for ethnic minorities in neighboring countries. In India, the Constitution refers to them as Scheduled Tribes and Janjati. However, the government does not officially recognize tribes as indigenous. India ratified the ILO Convention 107 but refused to sign the ILO Convention 169. Most Adivasi groups are included in the Scheduled Tribe category in India.

Hmong people: The Hmong are an indigenous group in East and Southeast Asia, mainly residing in Southwest China and countries in Southeast Asia. In China, they are considered a sub-group of the Miao people. There is also a significant diasporic community in the United States, with smaller communities in Australia and South America.

Kurds: The Kurds are an Iranic ethnic group native to the mountainous region of Kurdistan in Western Asia. They are spread across southeastern Turkey, northwestern Iran, northern Iraq, and northern Syria, with enclaves in Central Anatolia, Khorasan, and the Caucasus. Additionally, there are large Kurdish diaspora communities in western Turkey and Western Europe. The estimated Kurdish population is between 30 and 45 million.

Han Chinese: The Han Chinese are the largest ethnic group in the world, representing about 17.5% of the global population. Originating from China, they are an East Asian ethnic group.

Tibetan people: The Tibetan people are an East Asian ethnic group with a population of around 6.7 million. They primarily reside in Tibet Autonomous Region, China, but substantial Tibetan communities also exist in Chinese provinces of Gansu, Qinghai, Sichuan, and Yunnan. Additionally, Tibetans can be found in India, Nepal, and Bhutan.

Uyghurs: The Uyghurs are a Turkic ethnic group from Central and East Asia, recognized as the titular nationality of the Xinjiang Uyghur Autonomous Region in Northwest China. They are one of China's 55 officially recognized ethnic minorities and are considered the titular people of Xinjiang.

Basques: The Basques are an ethnic group in Southwestern Europe, with their own language, culture, and shared ancestry. They are indigenous to the Basque Country, which spans parts of Spain and France.

Romani people: The Romani, also known as Roma, are an Indo-Aryan ethnic group with a nomadic history starting from present-day Rajasthan, India. Linguistic and genetic evidence supports their Indian origin. They migrated westward around 1000 CE and arrived in Europe during the 13th to 14th century. While dispersed, their largest populations are found in Europe and western Asia, notably in central, eastern, and southern Europe.

Sámi peoples: The Sámi are indigenous people who speak Sámi languages and live in Sápmi, covering parts of Norway, Sweden, Finland, and the Kola Peninsula in Russia. Sápmi was previously known as Lapland, and the Sámi prefer their own language for the region's name. They are part of the Uralic language family.

Slavs: The Slavs are a group of related ethnic groups speaking various Slavic languages. They are distributed throughout Eurasia, primarily inhabiting Central, Eastern, and Southeastern Europe. A significant Slavic diaspora has developed in the Americas and Western and Northern Europe through immigration.

Aboriginal Australians: Aboriginal Australians are Indigenous peoples of Australia and its islands, excluding Torres Strait Islanders. They are often collectively referred to as Indigenous Australians.

Māori people: The Māori people are indigenous to mainland New Zealand, originating from East Polynesia settlers who arrived between 1320 and 1350. They developed a unique culture over centuries of isolation, with distinct language, mythology, crafts, and performing arts. Some Māori migrated to the Chatham Islands, giving rise to another indigenous Polynesian group called the Moriori.

Language: Language is a structured system of communication with grammar and vocabulary. It allows humans to convey meaning through spoken, written, and sign forms. Most languages have writing systems. Language varies across cultures and time. It is productive and allows the creation of limitless sentences and referencing absent things. Language is acquired through learning and relies on social convention.

Origin of language: The origin of language is a topic of study that has been ongoing for centuries. Scholars rely on evidence from fossils, archaeology, language diversity, acquisition studies, and animal communication comparisons. Language's beginnings likely coincide with the emergence of modern human behavior, but no consensus exists on the details and implications of this connection.

Literacy: Literacy refers to specific methods of reading and writing within a particular context. It involves the ability to understand and convey thoughts or ideas through written communication. Literate societies have established practices and beliefs about reading and writing, which influence how literacy is taught and practiced.

Reading: Reading is the act of comprehending written information through visual or tactile means, involving the interpretation and understanding of letters and symbols.

Speech: Speech is the vocal communication of humans using language, which involves using phonetic combinations of vowel and consonant sounds to form words. Speakers perform intentional speech acts like informing, declaring, asking, persuading, and directing, using various vocal aspects to convey meaning. Additionally, unintentionally, speakers communicate their social position through aspects like sex, age, origin, physical and psychological states, education, and experience.

Translation: Translation is the transfer of meaning from a source language to a target language through written communication. It is distinct from interpretation and can only occur once writing exists within a language community.

Writing: Writing is a cognitive and social activity that uses writing systems to create lasting records of human language. It relies on semantic structures like lexicon and syntax, using symbols to represent phonology and morphology. Written language can have unique characteristics compared to spoken language.

Alphabet: An alphabet is a set of letters that represent spoken sounds in a language. It enables the distinction of words based on phonemes. Unlike other writing systems that use symbols for syllables or words, an alphabet uses letters for precise linguistic representation.

Letter (alphabet): A letter is a symbol in a writing system that represents a phonemic sound. Letters make up an alphabet, and generally match phonemes in spoken language, although not always consistently.

Orthography: Orthography refers to the rules and conventions for writing a language. It includes norms for spelling, hyphenation, capitalization, word boundaries, emphasis, and punctuation.

Transliteration: Transliteration refers to converting text from one script to another by swapping letters in predictable ways (e.g., Greek ⟨α⟩ becoming ⟨a⟩). This process involves replacing characters, such as Cyrillic ⟨д⟩ becoming ⟨d⟩ and Armenian ⟨ն⟩ becoming ⟨n⟩. Transliteration also includes transforming characters into digraphs, for example, Greek ⟨χ⟩ turning into the digraph ⟨ch⟩. Even Latin characters can be transliterated, as seen with ⟨æ⟩ being converted into ⟨ae⟩.

Writing system: A writing system is a visual method of representing spoken language. It involves a script and rules called orthography that regulate its use.

Grammar: Grammar refers to the rules that govern how speakers or writers use and create clauses, phrases, and words in a natural language. It involves the study of phonology, morphology, syntax, phonetics, semantics, and pragmatics. There are two main approaches to studying grammar: traditional and theoretical.

Syntax: Syntax is the study of language structure, including how words and morphemes come together to create phrases and sentences. It explores word order, grammatical relations, sentence structure, agreement, crosslinguistic variation, and the connection between form and meaning. Various approaches exist, each with different assumptions and objectives.

Sentence (linguistics): A sentence in linguistics is a linguistic expression that expresses a complete thought or consists of a subject and predicate. It can also be a maximal unit of syntactic structure or a delimited unit of written texts. A sentence can convey statements, questions, exclamations, requests, commands, or suggestions.

Clause: A clause in language is made up of a subject and a predicate. The predicate usually includes a verb along with other modifiers. In some cases, the subject can be omitted if it can be understood from the context.

Phrase: In grammar, a phrase is a group of words acting as a grammatical unit. It can be a single word or a complete sentence. In linguistics, phrases are analyzed as units of syntactic structure. However, in common usage, a phrase often has idiomatic or special meaning. These are known as phrasemes in linguistics.

Proverb: A proverb is a traditional saying that expresses wisdom or truth based on common sense or experience. It is often metaphorical and uses formulaic language. Proverbs are fixed expressions, while proverbial phrases allow alterations to fit the context. They form a genre of folklore transmitted orally.

Grammatical tense: Grammatical tense refers to the category of time reference in grammar. It is expressed through verb forms, specifically conjugation patterns.

Speech act: A speech act is an utterance that conveys both information and performs an action. It is a way of expressing desires or making requests while presenting specific intentions to others. For instance, saying "I would like the kimchi; could you please pass it to me?" not only expresses the desire for kimchi but also requests someone to pass it.

Linguistics: Linguistics is the scientific study of language, encompassing theoretical and descriptive analysis. It is connected to applied language studies and learning specific languages. While historically linked to literary study, linguistics now employs scientific methods.

Linguistic typology: Linguistic typology is a field of linguistics that categorizes and compares languages based on their structural characteristics. It aims to understand and explain the diversity and commonalities of languages worldwide. It includes subdisciplines like phonological, syntactic, lexical, and theoretical typology.

Comparative linguistics: Comparative linguistics is a branch of historical linguistics that studies the historical connections between languages through language comparison.

Historical linguistics: Historical linguistics studies language change over time. It describes and explains changes in languages, reconstructs their pre-history and relationships, and develops theories of language change. Additionally, it explores the history of speech communities and words, while considering the impact of cultural and social factors on language evolution.

Etymology: Etymology is the study of a word's origin and how its meaning has evolved over time. It looks at the building blocks of words and their sounds. It is a subfield of linguistics that draws upon various disciplines to create a chronological record of a word's various meanings.

Phonetics: Phonetics is a branch of linguistics that studies how humans produce and perceive sounds in speech and sign languages. Phoneticians specialize in studying the physical properties of speech. The field of phonetics can be divided into three sub-disciplines, focusing on how speech is produced, how it affects sound properties, and how sound waves are converted into linguistic information. Phonetics examines the minimal linguistic unit called a phone, which is a speech sound that differs from the abstract unit called a phoneme, which determines meaning in a language.

Consonant: A consonant is a speech sound articulated with closure or partial closure of the vocal tract. Examples include sounds like [b], [d], and [g] made with the lips, front or back of the tongue. Other consonants are pronounced throughout the vocal tract or with air forced through a narrow channel. Nasals are consonants with air flowing through the nose. Consonants contrast with vowels in speech.

International Phonetic Alphabet: The International Phonetic Alphabet (IPA) is a standardized alphabetic system created by the International Phonetic Association. It represents speech sounds in written form and is used by various professionals, including linguists, teachers, and translators.

Prosody (linguistics): Prosody in linguistics refers to the study of suprasegmental features in speech, which include intonation, stress, and rhythm. It examines elements beyond individual phonetic segments, focusing on syllables and larger units of speech.

Vowel: A vowel is a speech sound produced without restrictions in the vocal tract. It is one of the two main types of speech sounds, along with consonants. Vowels differ in quality, loudness, and length. They are typically voiced and play a significant role in tonal, intonational, and stress-related variations.

Sociolinguistics: Sociolinguistics is the study of how society, culture, and context influence language use. It examines the impact of language on society and overlaps with sociology of language, pragmatics, and linguistic anthropology.

Accent (sociolinguistics): In sociolinguistics, an accent is a distinct way of pronouncing a language, influenced by factors such as geography, social class, ethnicity, and first language. It can be associated with a specific region or social group.

Dialect: A dialect refers to two separate linguistic relationships.

Diglossia: Diglossia is a linguistic situation where a community uses two dialects or languages. One is used in everyday conversations, while the other is used in formal settings like education or literature. In triglossia, three dialects are employed. Digraphia refers to the coexistence of two writing systems for a single language.

Endangered language: An endangered language is one that is at risk of disappearing as its speakers either die out or shift to other languages. When a language has no native speakers left, it becomes a dead language. If no one can speak it at all, it becomes extinct. However, even dead languages can be studied through recordings or writings. The accelerated rate of language extinction today is attributed to globalization, mass migration, cultural replacement, imperialism, neocolonialism, and linguicide.

Language death: Language death is the extinction of a language when its last native speaker passes away. It is also known as language extinction, when the language is no longer known by anyone, including second-language speakers. Linguicide refers to the death of a language due to natural or political causes, while glottophagy is the absorption of a minor language by a major one.

Multilingualism: Multilingualism refers to the use of multiple languages by individuals or groups. It is prevalent worldwide, with multilingual speakers outnumbering monolingual ones. Over half of Europeans speak at least one language in addition to their native tongue. Multilingualism offers advantages in trade, globalization, and cultural exchange. The Internet has made it easier for people to be exposed to multiple languages. Those who speak multiple languages are known as polyglots.

Slang: Slang is informal vocabulary used in speech, not formal writing. It can also be exclusive language used by certain groups to identify themselves and exclude others. The term originated in the 18th century and has had various definitions over time.

Morphology (linguistics): Morphology in linguistics studies the formation and relationships of words within a language. It analyzes word structure, including stems, root words, prefixes, and suffixes. It also examines parts of speech, intonation, stress, and how context affects word pronunciation and meaning. Morphology is distinct from morphological typology, which classifies languages based on word usage, and lexicology, which studies a language's vocabulary composition.

Morpheme: A morpheme is the smallest meaningful part of a word. It is studied in morphology, a field of linguistics.

Phonology: Phonology is a linguistic branch that studies how languages organize sounds or signs. It can refer to the system of sounds in a specific language, and it encompasses any linguistic analysis.

Phoneme: A phoneme is a group of sounds that differentiate words in a language.

Syllable: A syllable is a unit of speech made up of a nucleus and optional margins. Syllables are the building blocks of words, influencing a language's rhythm, prosody, metre, and stress patterns. Speech can be divided into a whole number of syllables, such as the word "ignite" having two syllables: "ig" and "nite."

Semantics: Semantics is the study of reference, meaning, and truth in various disciplines like philosophy, linguistics, and computer science.

Euphemism: A euphemism is a mild or indirect word or expression used instead of one that is considered offensive or unpleasant. It can be used to downplay or soften certain concepts, or to avoid talking directly about sensitive or taboo subjects like disability, sex, excretion, or death. Euphemisms are often employed to mask profanity and maintain politeness.

Profanity: Profanity, also known as cursing or swearing, involves the use of offensive words for various purposes, such as demonstrating disrespect or expressing strong emotions. It can also serve as an intensifier, show informality, or relieve pain. However, it is considered rude in formal or polite settings and is considered a sin in some religions. Profanity encompasses slurs but can also include insults that do not involve swear words.

Semiotics: Semiotics is the study of sign processes and communication of meaning. It defines sign as anything that conveys intentional or unintentional meaning or feelings to interpreters.

Pragmatics: Pragmatics is the study of how context shapes meaning in language. It examines language use in social interactions and the relationship between interpreter and speaker. Pragmaticians are linguists specialized in this field. The International Pragmatics Association (IPrA) represents pragmatics since 1986.

Symbol: Symbols are marks, signs, or words that represent ideas or objects. They link different concepts and allow communication beyond what is known or seen. Symbols can take the form of words, sounds, gestures, ideas, or images, and convey beliefs and ideas. Examples include the red octagon symbolizing "STOP," blue lines on maps representing rivers, and a red rose symbolizing love. Numerals, alphabet letters, and personal names are also symbols.

Word: A word is a fundamental part of language that carries meaning and can stand alone. Linguists have not agreed on a precise definition, leading to controversy. Various criteria based on phonology, grammar, and orthography have been proposed. Some argue that the concept of a word is merely a convention in everyday situations.

Noun: A noun is a word that names objects, including living creatures, places, actions, qualities, states of existence, or ideas.

Name: A name is a term for identification used by an observer. It can identify a class or individual uniquely or within a context. The entity identified is called its referent. Personal names identify specific individuals. Specific entities have proper names, while other nouns are called common names. Names can be given to people, places, or things.

Personal name: A personal name refers to the set of names by which an individual is known. It can be the person's birth name or legal name. Linguistically, personal names are studied under the discipline of anthroponymy.

Surname: A surname is the hereditary part of a person's name that signifies their family. It is combined with a given name to form a person's full name.

Verb: A verb is a word that conveys an action, occurrence, or state of being. It can be inflected to encode tense, aspect, mood, and voice in different languages. Verbs can also agree with the person, gender, or number of their subject or object. They have tenses, including present, past, and future, which indicate the timing of an action.

Adjective: Adjective: a word that describes a noun or noun phrase, altering the information provided by the noun.

Adverb: An adverb is a word or expression that modifies a verb, adjective, or other adverbs. It answers questions about how, when, where, and to what extent. Adverbs can be single words or phrases and clauses, performing the adverbial function.

Conjunction (grammar): A conjunction is a part of speech that connects words, phrases, or clauses. It may have different meanings in different languages and can sometimes be a preposition. In English, a word can be a conjunction or a preposition depending on its usage in a sentence. Conjunctions are invariable grammatical particles that join items together.

Interjection: An interjection is a word or expression that stands alone to express a spontaneous feeling. It includes exclamations, curses, greetings, and hesitation markers. Interjections overlap with profanities, discourse markers, and fillers. The use of interjections can be traced historically through Greek and Latin Modistae.

Pronoun: A pronoun is a word or group of words that can replace a noun. It is used in linguistics and grammar to avoid repetitive use of nouns.

Preposition and postposition: Prepositions and postpositions, known as adpositions, are words that indicate spatial or temporal relationships and mark semantic roles. They express how things are positioned or located in relation to each other.

Language family: A language family consists of languages that share a common ancestor called the proto-language. Linguists compare languages to a biological family tree or an evolutionary taxonomy. Daughter languages within a family are genetically related. The proto-language evolves into distinct languages due to geographical separation and different language changes.

Afroasiatic languages: The Afroasiatic languages are a family of about 400 languages spoken in West Asia, North Africa, the Horn of Africa, and parts of the Sahara and Sahel. They are the fourth-largest language family, with over 500 million native speakers. The family is divided into six branches: Berber, Chadic, Cushitic, Egyptian, Semitic, and Omotic. Most Afroasiatic languages are indigenous to Africa, excluding the Semitic branch.

Semitic languages: Semitic languages, a branch of Afroasiatic language family, include Arabic, Amharic, Hebrew, and others. Spoken by over 330 million people in West Asia, North Africa, the Horn of Africa, Malta, and immigrant communities worldwide. Term was coined in 1780s based on Shem, one of Noah's sons in the Book of Genesis.

Algic languages: Algic languages are a group of indigenous languages in North America, primarily belonging to the Algonquian subfamily. They are spoken across a wide region from the Rocky Mountains to Atlantic Canada. In addition to the Algonquian languages, the Yurok and Wiyot languages in northwestern California are also considered part of the Algic family. These languages all originated from a common ancestral language called Proto-Algic, estimated to have been spoken about 7,000 years ago. Proto-Algic was reconstructed using Proto-Algonquian, Wiyot, and Yurok languages.

Austroasiatic languages: The Austroasiatic languages are spoken in Southeast Asia, South Asia, and East Asia, with Vietnamese and Khmer being the most widely spoken. Approximately 117 million people speak an Austroasiatic language, with Vietnamese accounting for the majority. Other languages like Mon, Wa, and Santali also have significant presence. Vietnamese and Khmer are national languages in Vietnam and Cambodia respectively, while Mon is recognized in Myanmar and Thailand. The remaining languages are spoken by minority groups and lack official status.

Austronesian languages: Austronesian languages is a widely spoken language family found in Maritime Southeast Asia, parts of Mainland Southeast Asia, Madagascar, the islands of the Pacific Ocean, and Taiwan, with approximately 386 million speakers. It is the fifth-largest language family in terms of speakers and includes major languages like Malay, Javanese, Sundanese, Tagalog, Malagasy, and Cebuano. This language family comprises 1,257 languages, making it the second-largest language family.

Creole language: A creole language is a stable natural language that forms from the mixing and simplification of different languages. It develops into a complete language with its own grammar and vocabulary in a relatively short time. Creoles stand out for their systematic grammar and large vocabulary, and they are acquired by children as their first language. This distinguishes them from pidgins. Creolistics is the study of creole languages in linguistics. A person who engages in this study is called a creolist.

Dravidian languages: Dravidian languages are spoken by 250 million people in southern India, north-east Sri Lanka, and south-west Pakistan. They were first attested in the 2nd century BCE through inscriptions in Tamil-Brahmi script in Tamil Nadu.

Eskaleut languages: Eskaleut languages, also known as Eskimo–Aleut or Inuit–Yupik–Unangan languages, are native to northern North America and a small part of northeastern Asia. They are spoken in Alaska, Canada, Greenland, and the Russian Far East. The family includes Inuit, Yupik, and Unangan languages.

Indo-European languages: The Indo-European languages are spoken across Europe, the Iranian plateau, and the northern Indian subcontinent. They include popular languages like English, French, Portuguese, Russian, Dutch, and Spanish that have spread globally through colonialism. The family is divided into branches, with eight still alive today, such as Albanian, Armenian, Balto-Slavic, Celtic, Germanic, Hellenic, Indo-Iranian, and Italic/Romance. There are also nine extinct subdivisions within this language family.

Indo-Aryan languages: The Indo-Aryan languages are a branch of Indo-Iranian languages in the Indo-European language family. They have over 800 million speakers, mainly in India, Pakistan, Sri Lanka, Bangladesh, Nepal, and Maldives. Additionally, Indo-Aryan communities are found in Europe, Asia, America, the Caribbean, Africa, Polynesia, and Australia. There are more than 200 documented Indo-Aryan languages.

Romance languages: Romance languages, derived from Vulgar Latin, are the sole surviving subgroup of the Italic branch in the Indo-European language family.

Germanic languages: Germanic languages: A branch of Indo-European languages spoken mainly in Europe, North America, Oceania, and Southern Africa by around 515 million people. English, the most spoken Germanic language, is the world's most widely spoken language with an estimated 2 billion speakers. All Germanic languages trace their origins to Proto-Germanic, spoken in Iron Age Scandinavia and Germany.

Iranian languages: The Iranian languages, also known as Iranic languages, are a subgroup of the Indo-Iranian languages within the Indo-European language family. They are spoken mainly by Iranian peoples on the Iranian Plateau.

Slavic languages: The Slavic languages, also known as the Slavonic languages, are Indo-European languages spoken mainly by Slavic peoples. They are believed to come from a proto-language called Proto-Slavic, originating from Proto-Balto-Slavic. This places the Slavic languages in a Balto-Slavic group within the broader Indo-European family.

Kartvelian languages: Kartvelian languages are indigenous to South Caucasus, primarily spoken in Georgia, with over 5.2 million speakers globally. They have no known relation to any other language family, establishing themselves as one of the world's primary language families.

Khoisan languages: Khoisan languages are African languages with click consonants that do not belong to other language families. Originally thought to be related, they are now classified into three language families and two isolates.

Kra–Dai languages: The Kra–Dai languages are a language family in Southeast Asia, China, and India. They are tonal and include Thai and Lao, the national languages of Thailand and Laos. Around 93 million people speak Kra–Dai languages, with Thai being the most widely spoken. The family encompasses 95 languages, with the Tai branch consisting of 62 languages.

Niger–Congo languages: Niger-Congo languages are a hypothetical language family spoken across most of sub-Saharan Africa, including the Mande and Atlantic-Congo languages. It could potentially be the world's largest language family, with the most distinct languages and the third-largest number of speakers. Its geographical area coverage in Africa is also the largest. However, the classification of certain smaller language groups poses challenges, and there is debate about what qualifies as a distinct language. Ethnologue lists 1,540 named Niger-Congo languages.

Bantu languages: The Bantu languages are a family of around 600 different languages spoken by the Bantu peoples in Central, Southern, Eastern, and Southeast Africa. These languages make up the largest portion of the Southern Bantoid language group.

Nilo-Saharan languages: The Nilo-Saharan languages are African languages spoken by around 70 million people in the upper regions of the Chari and Nile rivers, including historic Nubia. They are found in 17 countries across northern Africa, from Algeria to Tanzania.

North Caucasian languages: The North Caucasian languages, or Caucasic, are two well-established language families spoken predominantly in the north Caucasus region. They include the Northwest Caucasian family and the Northeast Caucasian family, comprising around 34 to 38 distinct languages.

Quechuan languages: Quechuan languages, also known as Quechua or Runasimi, are an indigenous language family originated in Peru and later spread to other Andean countries. Derived from a common ancestral language, it is the most widely spoken pre-Columbian language family in the Americas, with an estimated 7-10 million speakers. In Peru, approximately 13.9% of the population speaks a Quechua language.

Sign language: Sign language is a visual-manual language using gestures instead of speech. It has its own grammar and vocabulary and is not universal or mutually intelligible, but does share similarities across different sign languages.

Sino-Tibetan languages: Sino-Tibetan languages, also referred to as Trans-Himalayan, is a language family with over 400 languages spoken by more than 1.4 billion people. It is the second most spoken language family after Indo-European. The majority of speakers are native speakers of Sinitic languages, totaling around 1.3 billion. Other widely spoken Sino-Tibetan languages include Burmese and Tibetic languages. The family's languages are found in the Himalayas, the Southeast Asian Massif, and the eastern Tibetan Plateau, with many having small and remote speech communities, resulting in limited documentation.

Trans–New Guinea languages: Trans-New Guinea (TNG) languages are a group of Papuan languages spoken in Papua New Guinea and parts of Indonesia. This language family is extensive and also includes neighboring islands.

Turkic languages: The Turkic languages are a family of over 35 documented languages spoken by Turkic peoples across Eurasia. They originated in East Asia and expanded to Central Asia and beyond. These languages form a dialect continuum.

Uralic languages: The Uralic languages are a family of 38 languages spoken by around 25 million people in Europe and Northern Asia. Hungarian, Finnish, and Estonian have the most native speakers. Some other significant languages include Erzya, Moksha, Mari, Udmurt, Northern Sámi, Komi, Karelian, and the Samoyedic languages. These languages are mainly spoken in northern Scandinavia and parts of Russia.

Uto-Aztecan languages: Uto-Aztecan languages are a family of over thirty indigenous languages in the Americas. They are mainly spoken in Western United States and Mexico. The name reflects the inclusion of Ute language from Utah and Nahuan languages from Mexico.

Braille: Braille is a tactile writing system for the visually impaired. It can be read on embossed paper or via refreshable braille displays on computers and smartphones. Braille can be written using various tools such as slate and stylus, braille writer, electronic braille notetaker, or a computer connected to a braille embosser.

Arabic script: Arabic script is a widely used writing system primarily for Arabic, Asian and African languages. It is the second-most used alphabetic writing system globally and the third-most used writing system by number of users and countries.

Brahmic scripts: Brahmic scripts, also called Indic scripts, are a group of abugida writing systems. Originating from ancient India's Brahmi script, they are widely used across the Indian subcontinent, Southeast Asia, and parts of East Asia. These scripts are employed by various languages in South, East, and Southeast Asia, including Indo-Aryan, Dravidian, Tibeto-Burman, Mongolic, Austroasiatic, Austronesian, and Tai language families. Additionally, Brahmic scripts played a crucial role in developing the dictionary order (gojūon) of Japanese kana.

Chinese characters: Chinese characters are logographs used for writing Chinese languages and other cultures influenced by Chinese. They have a documented history spanning over three millennia and are considered one of the four independent inventions of writing. Chinese characters are the only writing system continuously used since their invention. The function, style, and means of writing characters have evolved over time. Simplified characters are used in mainland China, Singapore, and Malaysia, while traditional characters are used in Taiwan, Hong Kong, and Macau.

Cuneiform: Cuneiform is an ancient writing system used in the Near East. It consists of wedge-shaped impressions that form its signs. This script was developed to write the Sumerian language and was used extensively from the early Bronze Age until the beginning of the Common Era.

Cyrillic script: The Cyrillic script, also known as the Slavic script, is a writing system used for multiple languages in Eurasia. It is the official script in countries across Southeastern Europe, Eastern Europe, the Caucasus, Central Asia, and East Asia.

Devanagari: Devanagari, also known as Nāgari, is a popular left-to-right abugida script used in the northern Indian subcontinent. It is based on the ancient Brāhmi script and is one of the official scripts in India and Nepal. The script has been in use since the 7th century CE and attained its modern form by 1000 CE. With 48 characters including vowels and consonants, Devanagari is the fourth most widely adopted writing system, used in over 120 languages worldwide.

Egyptian hieroglyphs: Egyptian hieroglyphs were an ancient writing system used in Egypt. They combined logographic, syllabic, and alphabetic elements, featuring over 100 distinct characters. Cursive hieroglyphs were used for religious literature, while hieratic and demotic scripts evolved from hieroglyphs. The Proto-Sinaitic script and Phoenician alphabet derived from hieroglyphic writing. The Egyptian hieroglyphic script is the ancestor of many modern scripts, including Latin, Cyrillic, Arabic, and possibly Brahmic.

Greek alphabet: The Greek alphabet is a writing system that has been used since the 8th century BC. Derived from the Phoenician alphabet, it was the first alphabetic script to have separate letters for both vowels and consonants. Initially, it had various local variations, but by the 4th century BC, the standardized Euclidean alphabet with 24 letters from alpha to omega became the norm and is still used for Greek writing today.

Hangul: Hangul is the official writing system for the Korean language, used in South Korea (Hangul) and North Korea (Chosŏn'gŭl). It combines alphabetic and syllabic features and is known for its featural system. The shape of the letters reflects how they are pronounced, and modifications indicate phonetic features. Hangul is not strictly an abugida.

Japanese writing system: The Japanese writing system combines logographic kanji with syllabic kana. Kana includes hiragana for native words and katakana for foreign words. Written Japanese uses a combination of kanji and kana, making it one of the most complex writing systems.

Latin script: The Latin script, also known as the Roman script, is an alphabetic writing system based on the letters of the classical Latin alphabet. It originated from a modified version of the Greek alphabet used in Cumae, Italy. The Etruscans further altered the Greek alphabet, and then the Romans modified it again. There are multiple variations of the Latin script, with different letters, arrangement, and pronunciation compared to the classical Latin alphabet.

Maya script: Maya script, or Maya glyphs, was the writing system of the Maya civilization in Mesoamerica. It is the only Mesoamerican writing system to be largely deciphered. The earliest Maya inscriptions date back to the 3rd century BCE. This script was used until the Spanish conquest of the Maya in the 16th and 17th centuries.

Morse code: Morse code is a telecommunication encoding method using dots and dashes, named after Samuel Morse, an early developer of the electrical telegraph.

Phoenician alphabet: The Phoenician alphabet, used by the Phoenician civilization, is a historical writing system found in Canaanite and Aramaic inscriptions across the Mediterranean region.

Rosetta Stone: The Rosetta Stone is an ancient stele with inscriptions in three languages: Ancient Egyptian, Ancient Greek, and Demotic. It was created during the Ptolemaic dynasty in 196 BC and contains a decree from King Ptolemy V Epiphanes. The stone played a crucial role in deciphering Egyptian scripts as it provided a means to compare and translate the languages.

Runes: Runes are letters in ancient Germanic alphabets used before the Latin alphabet. They represent sounds and concepts, known as Begriffsrunen. The Scandinavian version is called fuþark or futhark, and the Anglo-Saxon version is futhorc or fuþorc.

Japanese language: The Japanese language is the main language of the Japonic language family, spoken by the Japanese people. With approximately 128 million speakers, it is primarily spoken in Japan, the only country where it is the national language. It is also spoken by the Japanese diaspora across the globe.

Korean language: The Korean language is spoken by around 81.7 million people, primarily of Korean descent. It serves as the official language in South Korea and North Korea. These two countries have established standardized norms for Korean, which have minor differences. Political conflicts have emphasized these differences. According to Daily NK, North Korea reportedly criminalizes the use of South Korea's standard language, with penalties as severe as the death penalty. South Korean education and media often portray North Korea's language as unfamiliar and unsettling.

Akkadian language: Akkadian language, extinct in ancient Mesopotamia, gradually replaced by Old Aramaic among Assyrians and Babylonians in 8th century BC.

Amharic: Amharic is an Ethiopian Semitic language spoken primarily by the Amharas. It belongs to the Afroasiatic language family and serves as a common language for diverse populations residing in major Ethiopian cities and towns.

Arabic: Arabic is a Semitic language spoken in the Arab world, originating in the first millennium BC. It is named after the Arab people, initially used to describe those in the Arabian Peninsula, according to ancient Greek geographers.

Classical Arabic: Classical Arabic refers to the standardized literary form of Arabic used from the 7th century onwards. It was prominent in Umayyad and Abbasid literary texts, including poetry, prose, and oratory. Additionally, it serves as the liturgical language of Islam. Modern Standard Arabic is based on Classical Arabic.

Egyptian Arabic: Egyptian Arabic, also known as Colloquial Egyptian or Masri, is the primary spoken dialect in Egypt and is part of the Afro-Asiatic language family. It originated in the Nile Delta and is spoken by approximately 100 million Egyptians. The most dominant dialect is Cairene. Egyptian Arabic is widely understood in Arabic-speaking countries due to Egyptian cultural influence, particularly through cinema and music. It is not only the most spoken, but also the most extensively studied variety of Arabic.

Aramaic: Aramaic is an ancient Semitic language that originated in Syria and spread to various regions including Mesopotamia, Levant, Anatolia, Arabia, and Sinai. It has been written and spoken for over 3000 years. Aramaic served as a prominent language for government and religious purposes. Today, its modern varieties, known as Neo-Aramaic, are still spoken by Assyrians, Mandeans, Mizrahi Jews, and in certain Syrian towns. Aramaic is also used as a liturgical language by several West Asian churches.

Berber languages: The Berber languages, also known as Amazigh or Tamazight, are closely related spoken languages by indigenous Berber communities in North Africa. They are a branch of the Afroasiatic language family. Historically written in ancient scripts, today they are primarily spoken and can be written in Tifinagh, Berber Latin alphabet, or Arabic script.

Egyptian language: Ancient Egyptian is an extinct Afro-Asiatic language spoken in ancient Egypt. It is one of the earliest written languages, recorded in hieroglyphics around 4,000 years ago. Middle Egyptian was the classical form and remained the literary language until the Roman period. Demotic and later Coptic dialects evolved from the spoken language. Arabic eventually replaced it after the Muslim conquest, but Coptic remains in use by the Coptic Church.

Hebrew language: Hebrew is a Northwest Semitic language that was natively spoken by the Israelites. It remained in use until after 200 CE as their first language and as the liturgical language of Judaism and Samaritanism. Hebrew successfully revived as a spoken language in the 19th century, making it a notable example of linguistic revival. Today, Hebrew is still spoken and is the only Canaanite language and one of only two Northwest Semitic languages still in use, the other being Aramaic.

Hausa language: The Hausa language is a Chadic language spoken by the Hausa people in northern Nigeria, Ghana, Cameroon, Benin, Togo, Niger, Chad, and Sudan. It also has significant minority speakers in Ivory Coast.

Oromo language: The Oromo language, also known as Galla, is an Afroasiatic language in the Cushitic branch. It is primarily spoken by the Oromo people and neighboring ethnic groups in the Horn of Africa. It is native to the Ethiopian state of Oromia and Northern Kenya. In the Oromia Region and northeastern Kenya, it serves as a lingua franca.

Somali language: The Somali language is an Afroasiatic language spoken by Somalis in Greater Somalia and the Somali diaspora. It is an official language in Somalia, Ethiopia, and Djibouti, and a national language in northeastern Kenya. It uses the Latin alphabet, but also has informal usage of Arabic alphabet and Somali scripts.

Cebuano language: Cebuano is an Austronesian language spoken in the southern Philippines. It is commonly known as Bisayâ or Binisayâ and sometimes referred to as Cebuan in English. It is spoken by Visayan ethnolinguistic groups in various regions such as Cebu, Bohol, and Negros. Cebuano has also spread to other areas like Davao and Cotabato, often replacing native languages.

Indonesian language: The Indonesian language is the official and national language of Indonesia. It is a standardized form of Malay and has been used as a common language in the diverse Indonesian archipelago for centuries. With over 279 million inhabitants, Indonesia is the fourth most populous nation, making Indonesian one of the most widely spoken languages in the world. The language's vocabulary has been influenced by various languages, including Javanese, Minangkabau, Buginese, Banjarese, Arabic, Dutch, and English. Many borrowed words have been adapted to fit Indonesian's phonetic and grammatical rules.

Javanese language: The Javanese language is spoken by the Javanese people in central and eastern parts of Java, Indonesia. It is also spoken by some on the northern coast of western Java. With over 98 million native speakers, it is a Malayo-Polynesian language.

Malagasy language: The Malagasy language, an Austronesian dialect, is spoken in Madagascar. Official Malagasy is the standard variety and one of the official languages of Madagascar, along with French. It originated in Madagascar in the 5th century AD when Austronesian people from the Sunda islands settled there. Malagasy is the furthest west Malayo-Polynesian language. It is closely related to the Ma'anyan language of Borneo. The language includes loanwords from Malay, reflecting early Austronesian settlement and trade. Over time, it also incorporated loanwords from Bantu and Arabic traders and settlers.

Malay language: Malay is an Austronesian language spoken by 290 million people in Southeast Asia. It is an official language in Brunei, Indonesia, Malaysia, and Singapore, and is also spoken in parts of Thailand and East Timor.

Sundanese language: The Sundanese language is spoken by the Sundanese people in the western part of Java, Indonesia. It belongs to the Malayo-Polynesian language family. With around 40 million native speakers, it accounts for about 15% of Indonesia's population.

Tagalog language: Tagalog is an Austronesian language spoken by the ethnic Tagalog people in the Philippines. It is the first language for a quarter of the population and a second language for the majority. Its standardized form, Filipino, is the national language and one of two official languages, along with English.

Khmer language: The Khmer language is spoken by the Khmer people and is the official language of Cambodia. It has been influenced by Sanskrit and Pali, particularly in religious and royal contexts, due to the prevalence of Hinduism and Buddhism. Khmer is the earliest written language of the Mon-Khmer family, predating Mon and Vietnamese, and was used in historical empires like Chenla, Angkor, and Funan.

Vietnamese language: The Vietnamese language is the national and official language of Vietnam, spoken by approximately 85 million people. It is an Austroasiatic language and the native tongue of the Vietnamese people. Additionally, other ethnic groups in Vietnam also speak Vietnamese as a first or second language. The language is divided into three main dialects: Northern (Hanoi), Central (Hue), and Southern.

Esperanto: Esperanto is a widely spoken constructed international auxiliary language created in 1887 by L.L. Zamenhof. It aims to be a universal second language for international communication. The name Esperanto translates to "one who hopes" in English.

Kannada: Kannada, also called Canarese, is a Dravidian language spoken in southwestern India, primarily in Karnataka. It has approximately 44 million native speakers and is also spoken as a second or third language by around 15 million non-native speakers in the region.

Malayalam: Malayalam is a Dravidian language spoken primarily in Kerala, Lakshadweep, and Puducherry in India. It is one of the 22 scheduled languages of India and was recognized as a "Classical Language" in 2013. With official language status in Kerala, Lakshadweep, and Puducherry, it is spoken by 34 million people. It is also spoken by linguistic minorities in neighboring states and by the Malayali Diaspora worldwide. Malayalam is closely related to Tamil.

Tamil language: Tamil is a Dravidian language spoken by the Tamil people in South Asia. It is an official language in Tamil Nadu, Sri Lanka, Singapore, and Puducherry. Tamil is also spoken by minorities in Kerala, Karnataka, Andhra Pradesh, Telangana, and the Andaman and Nicobar Islands in India. Additionally, it is spoken by the Tamil diaspora in Malaysia, Myanmar, South Africa, UK, US, Canada, Australia, and Mauritius. Recognized as a classical language of India, Tamil is one of the 22 scheduled languages in the Constitution of India.

Telugu language: Telugu is a Dravidian language spoken by about 96 million people in the Indian states of Andhra Pradesh and Telangana. It is the most widely spoken Dravidian language and one of the official languages of India. Telugu has official status in more than one Indian state and is classified as a classical language. It is also the 14th most spoken native language worldwide. The modern standard Telugu is based on the dialects of Coastal Andhra districts.

Armenian language: Armenian is the only language in its branch of Indo-European languages. It is the native language of Armenians and the official language of Armenia. Spoken widely among Armenians worldwide, Armenian has its own unique writing system introduced in 405 AD. There are an estimated 5-7 million Armenian speakers internationally.

Greek language: Greek language is an independent branch of Indo-European languages spoken in Greece, Cyprus, Italy, southern Albania, and other regions. It boasts the longest recorded history among Indo-European languages, with written records spanning over 3,400 years. Greek uses the Greek alphabet, which has been in use for around 2,800 years and has influenced various other writing systems.

Ancient Greek: Ancient Greek refers to the forms of the Greek language used in ancient Greece and the ancient world from 1500 BC to 300 BC. It can be divided into Mycenaean Greek, Dark Ages, Archaic or Epic period, and Classical period.

Assamese language: Assamese language, known as Asamiya, is an Indo-Aryan language spoken in the state of Assam, India. It serves as both an official language and a lingua franca in the region. With over 15 million speakers, it is the easternmost Indo-Iranian language.

Bengali language: Bengali, also known as Bangla, is a widely spoken Indo-Aryan language in South Asia. It is native to the Bengal region and has around 234 million native speakers and 39 million second language speakers. Bengali ranks sixth in terms of native speakers and seventh in total number of speakers worldwide. It is also the fifth most spoken Indo-European language.

Gujarati language: Gujarati, an Indo-Aryan language, is spoken by the Gujarati people in the Indian state of Gujarat. It has its roots in Old Gujarati and is officially recognized in Gujarat and the union territory of Dadra and Nagar Haveli and Daman and Diu. With 55.5 million native speakers, it ranks as the 6th most spoken language in India, accounting for about 4.5% of the population. Additionally, it is the 26th most widely spoken language in the world (2007).

Hindustani language: Hindustani language is an Indo-Aryan language spoken in Northern India, Pakistan, and the Deccan region. It serves as a lingua franca in both countries. Hindustani has two standard registers, Hindi and Urdu, making it a pluricentric language. It is commonly referred to as Hindi-Urdu. The language encompasses a range of speech styles, from informal to formal, falling between these two standards. Additionally, a hybrid variety called Hinglish, influenced by English, has emerged in modern times.

Hindi: Hindi is a standardized Indo-Aryan language spoken in North India. It serves as the lingua franca of the Hindi Belt region and is based on the Delhi dialect. Written in Devanagari script, Hindi is one of India's official languages and is spoken in nine states and three union territories. It is also one of the 22 scheduled languages of India.

Urdu: Urdu is an Indo-Aryan language primarily spoken in South Asia. It serves as the national language and lingua franca of Pakistan, while also maintaining official and cultural recognition in India. It holds regional dialect status in Nepal and is protected by the constitution in South Africa. Although not officially recognized, Urdu is spoken as a minority language in Afghanistan and Bangladesh.

Marathi language: Marathi is an Indo-Aryan language spoken mainly in the Indian state of Maharashtra. It is the official language of Maharashtra and an additional official language in Goa. With 83 million speakers in 2011, it is one of India's 22 scheduled languages. Marathi holds the 13th position among languages with the most native speakers. It has a rich literary history and is known for its major dialects: Standard Marathi and Varhadi.

Nepali language: Nepali is an Indo-Aryan language spoken in Nepal and the Himalayas. It is also the official language of Nepal and is widely used as a lingua franca. Additionally, it has official status in Sikkim, India, and the Gorkhaland Territorial Administration of West Bengal. Nepali is spoken by a quarter of Bhutan's population and has a significant number of speakers in various states in India. It is also spoken by the Burmese Gurkhas in Myanmar and by the Nepali diaspora worldwide. Overall, there are around 16 million native speakers and 9 million second language speakers of Nepali.

Odia language: Odia is an Indo-Aryan language spoken in Odisha, India. It is the official language of the state, with 82% of the population being native speakers. It is also spoken in parts of West Bengal, Jharkhand, Andhra Pradesh, and Chhattisgarh. Odia is one of India's official languages and is also the second official language of Jharkhand.

Pali: Pali is an ancient liturgical language of the Indian subcontinent, known for its significance in Theravāda Buddhism. It is primarily recognized as the language of the Buddhist Pāli Canon and is extensively studied for its religious and scholarly value.

Sanskrit: Sanskrit is a classical Indo-Aryan language that originated in South Asia. It is the sacred language of Hinduism, and also used in Buddhism and Jainism. Sanskrit acted as a link language in ancient South Asia and played a major role in the transmission of Hindu and Buddhist culture to Southeast Asia, East Asia, and Central Asia. Its influence can be seen in the formal and learned vocabularies of languages in these regions.

Sindhi language: Sindhi is an Indo-Aryan language spoken by around 30 million people in the Pakistani province of Sindh and 1.7 million people in India. It is officially recognized in Sindh but lacks official status in India. The main writing system used is the Perso-Arabic script, which is predominant in Sindhi literature and used exclusively in Pakistan. In India, both the Perso-Arabic script and Devanagari are utilized.

Sinhala language: Sinhala language, also known as Sinhalese, is an Indo-Aryan language primarily spoken by the Sinhalese people of Sri Lanka. It is also spoken by other ethnic groups on the island and has about 16 million speakers. Sinhala is written using a script closely related to the Grantha script of South India.

Punjabi language: Punjabi, an Indo-Aryan language primarily spoken in the Punjab region of Pakistan and India, has around 113 million native speakers, making it one of the most widely spoken languages globally.

French language: French is a Romance language derived from Vulgar Latin and evolved from Gallo-Romance in Northern Gaul. It supplanted other langues d'oïl spoken in northern France and southern Belgium. French was influenced by Celtic and Frankish languages. The French colonial empire led to the development of French-based creole languages, like Haitian Creole. Francophone refers to a French-speaking person or nation in both English and French.

Italian language: Italian is a Romance language that developed from Vulgar Latin. It is closely related to Sardinian and is spoken by around 68 million people. Besides Italy, it is also an official language in San Marino, Switzerland, and Vatican City. It holds minority status in parts of Croatia and Slovenian Istria.

Latin: Latin is a classical language that was spoken in Latium, the lower Tiber area around Rome. It became the dominant language in the Italian Peninsula and the Roman Empire through the expansion of the Roman Republic. It remained the common language of international communication, academia, and scholarship in Europe until the 18th century. Despite being extensively used, Latin lacked native speakers and is considered a dead language.

Portuguese language: The Portuguese language is a Western Romance language originating from the Iberian Peninsula. It is the official language of Portugal, Brazil, and several other countries. Portuguese-speaking individuals are referred to as "Lusophones." The language has spread globally due to historical colonial expansion. Portuguese is part of the Ibero-Romance group influenced by Celtic phonology.

Romanian language: Romanian, the official language of Romania and Moldova, belongs to the Eastern Romance sub-branch of Romance languages. It evolved from Vulgar Latin dialects, separating from Western Romance in the 5th-8th centuries. Known as Daco-Romanian in comparison to other Eastern Romance languages, it has stable communities in neighboring countries and a significant diaspora. With roughly 28-29 million speakers, including 24 million native speakers, Romanian ranks 10th among 37 official languages in Europe.

Spanish language: Spanish, or Castilian, is a global Romance language with about 500 million native speakers in the Americas and Spain. It evolved from Vulgar Latin and is the official language of 20 countries. Spanish is the world's second-most spoken native language, fourth-most spoken overall, and most widely spoken Romance language. Mexico has the largest population of native speakers.

Danish language: Danish is a North Germanic language spoken by about six million people in Denmark, Greenland, the Faroe Islands, and Southern Schleswig. There are also minor Danish-speaking communities in Norway, Sweden, the United States, Canada, Brazil, and Argentina.

Dutch language: Dutch is a West Germanic language spoken by 25 million native speakers and 5 million second language speakers. It is the third most widely spoken Germanic language, following English and German. Afrikaans, a closely related language, evolved from Dutch and is spoken by 16 million people in South Africa and Namibia. The Dutch Language Union guides the dialects used in Belgium and Suriname.

English language: English language, a West Germanic language, originated in medieval England. It is named after the Angles, an ancient Germanic people who migrated to Great Britain. Today, English is the most spoken language globally and the second-most spoken native language. It is also widely learned as a second language, surpassing its native speakers.

Old English: Old English, or Anglo-Saxon, is the earliest recorded form of English. It developed in the early Middle Ages from languages brought by Anglo-Saxon settlers. Old English literary works emerged in the mid-7th century. After the Norman conquest, English was replaced by Anglo-Norman for some time, marking the end of the Old English era. Middle English and Early Scots then emerged in England and Scotland respectively.

Middle English: Middle English is the variant of English spoken from 1066 to the late 15th century. It emerged after the Norman Conquest and evolved during the High to Late Middle Ages. Oxford University Press designates its period from 1100 to 1500.

Modern English: Modern English is the current form of the English language spoken since the Great Vowel Shift in the late 14th to 17th century, distinguishing it from Middle and Old English.

German language: The German language is a widely spoken West Germanic language in Western and Central Europe. It is the most commonly spoken and official language in Germany, Austria, Switzerland, Liechtenstein, and South Tyrol. It is also an official language in Luxembourg and Belgium and a recognized national language in Namibia. German is spoken by German communities in Alsace, Czech Republic, Poland, Slovakia, and Sopron, Hungary.

Swedish language: Swedish is a North Germanic language primarily spoken in Sweden and parts of Finland. With over 10 million native speakers, it is the most widely spoken Germanic language in the Nordic countries and the fourth most spoken among all Germanic languages.

Yiddish: Yiddish is a West Germanic language historically spoken by Ashkenazi Jews. It originated in 9th century Central Europe, combining elements of High German, Hebrew, and Aramaic. It also includes influences from Slavic and Romance languages. Yiddish is traditionally written using the Hebrew alphabet, but there are alternative orthographies, like the standardized YIVO system using the Latin alphabet.

Kurdish languages: Kurdish refers to a group of languages spoken by Kurds in Kurdistan and around the world. These languages are part of the Western Iranian branch of the Indo-European language family and form a dialect continuum. The three main dialects are Northern Kurdish, Central Kurdish, and Southern Kurdish.

Pashto: Pashto is an Iranian language spoken in Pakistan, Afghanistan, and eastern Iran near the Afghan border. It is officially recognized in Afghanistan and the Pakistani province of Khyber Pakhtunkhwa. In Persian literature, it is referred to as Afghani.

Persian language: Persian, or Farsi, is a Western Iranian language spoken in Iran, Afghanistan, and Tajikistan. It has three standard varieties: Iranian Persian, Dari Persian, and Tajiki Persian. It is also spoken in Uzbekistan and regions with a Persianate history. Persian is written in the Persian alphabet in Iran and Afghanistan, and in the Tajik alphabet in Tajikistan.

Czech language: The Czech language, also known as Bohemian, is a West Slavic language spoken by over 10 million people. It is the official language of the Czech Republic and is closely related to Slovak and Polish. Czech is written in Latin script and is a fusional language with a rich system of morphology and flexible word order. Its vocabulary has been influenced by Latin and German.

Old Church Slavonic: Old Church Slavonic, the first Slavic literary language, was an ancient form of communication.

Polish language: Polish is a West Slavic language spoken in Poland and by the Polish diaspora. It uses the Latin script and has over 50 million speakers worldwide. It is the official language of Poland and ranks as the sixth most-spoken language in the European Union. Polish has regional dialects and maintains formalities in addressing individuals.

Russian language: Russian is an East Slavic language spoken in Russia. It is the native language of Russians and belongs to the Indo-European language family. Russian is one of four living East Slavic languages and part of the Balto-Slavic group. It was the official language of the former Soviet Union and remains official in Russia, Belarus, Kazakhstan, and Kyrgyzstan. It is widely used as a lingua franca in Ukraine, Moldova, the Caucasus, Central Asia, and to a lesser extent in the Baltic states and Israel. Russian is also an official language of the United Nations.

Serbo-Croatian: Serbo-Croatian is a South Slavic language spoken in Serbia, Croatia, Bosnia, and Montenegro. It has four standard varieties (Serbian, Croatian, Bosnian, Montenegrin) that are mutually intelligible, along with their subdialects. The language is divided into three supradialects: Shtokavian, Kajkavian, and Chakavian.

Ukrainian language: Ukrainian is an East Slavic language spoken in Ukraine, belonging to the Indo-European language family. It is the native tongue of Ukrainians.

Thai language: The Thai language, also known as Central Thai, is the official language of Thailand. It belongs to the Tai language family and is spoken by the Central Thai people, as well as the Mon in Central Thailand and Thai Chinese communities across the country.

Sumerian language: Sumerian, an ancient language dating back to at least 2900 BC, was spoken in ancient Mesopotamia (modern-day Iraq). It is considered one of the oldest known languages and is recognized as a local language isolate.

Fula language: The Fula language, also known as Fulani or Fulah, is spoken by about 36.8 million people in 18 countries across West and Central Africa. It is part of the Atlantic geographic group within Niger-Congo and belongs to the Senegambian branch. Notably, Fula does not use tones, distinguishing it from most other Niger-Congo languages.

Igbo language: The Igbo language is the main native language of the Igbo people, an ancient ethnic group from Southeastern Nigeria.

Swahili language: Swahili, or Kiswahili, is a Bantu language spoken primarily by the Swahili people in Tanzania, Kenya, and Mozambique. It is widely spoken by over 200 million people as either a first or second language.

Yoruba language: Yoruba is a language spoken primarily in Southwestern and Central Nigeria by the Yoruba people. It has around 44 million native speakers and an additional 2 million second-language speakers. It is a pluricentric language used in Nigeria, Benin, and Togo, with smaller communities in Côte d'Ivoire, Sierra Leone, and The Gambia.

Burmese language: Burmese is the official language of Myanmar spoken by the Bamar people. It is also spoken by indigenous tribes in parts of Bangladesh and India. Although officially referred to as the Myanmar language, it is commonly known as Burmese. With a population of 38.8 million speakers, it serves as a lingua franca and is spoken as a first language by 33 million people, with another 10 million using it as a second language.

Chinese language: Chinese language is spoken by the ethnic Han Chinese majority and minority ethnic groups in China. It is the first language for around 1.3 billion people, accounting for 16% of the global population.

Classical Chinese: Classical Chinese refers to the ancient language used in Chinese literary works from around the 5th century BCE. It is known as Literary Chinese, which was highly influential and widely used in formal writing in China until the early 20th century. Similar to Latin in post-Roman Europe, it evolved conservatively and did not incorporate changes seen in later Chinese varieties. The language has undergone significant linguistic evolution, making it unintelligible when spoken or read by those familiar with modern vernacular Chinese.

Hakka Chinese: The Hakka Chinese language is spoken by the Hakka people in Southern China, Taiwan, and diaspora communities worldwide. It is a distinct language group within Chinese, with variations found in East Asia, Southeast Asia, and overseas Chinese communities.

Mandarin Chinese: Mandarin Chinese is a group of Chinese dialects spoken in northern and southwestern China. It includes the Beijing dialect, which serves as the basis for Standard Chinese, the official language of China. While Mandarin originated in North China and is often referred to as Northern Chinese, its various dialects differ in mutual intelligibility. However, Mandarin is still frequently ranked first in terms of the number of native speakers.

Min Chinese: Min Chinese is a group of Sinitic languages, spoken by about 70 million native speakers. It is primarily spoken in Fujian province, along with other regions such as Taiwan, Hainan, and parts of Southeast Asia. The name Min is derived from the Min River in Fujian. Min varieties are distinct from each other and from other Chinese languages.

Wu Chinese: Wu Chinese is a group of Sinitic languages spoken primarily in Shanghai, Zhejiang Province, and southern Jiangsu Province. It forms the cultural region of Wu. Some Wu speakers identify their language as Shanghainese when communicating with foreigners. The prestige dialect of Wu was Suzhou in the 19th century, but Shanghainese gained more prominence by the 20th century. The languages in Northern Wu are mutually intelligible, while those in Southern Wu are not.

Yue Chinese: 'Yue Chinese' refers to a branch of Sinitic languages primarily spoken in Southern China. Its main regions of usage are Guangdong and Guangxi provinces.

Azerbaijani language: The Azerbaijani language, also known as Azeri or Azeri Turkic, is a Turkic language spoken by the Azerbaijani people. It has two main varieties: North Azerbaijani, which is official in Azerbaijan and Dagestan, and South Azerbaijani, which is spoken in the Azerbaijan region of Iran. While North Azerbaijani is more widely spoken, South Azerbaijani lacks official status in Iran. The language is also spoken in Azerbaijani communities in Georgia and Turkey, as well as by diaspora communities in Europe and North America.

Kazakh language: Kazakh, a Turkic language, is spoken in Central Asia by Kazakhs. It is related to Nogai, Kyrgyz, and Karakalpak. It is the official language of Kazakhstan and spoken by ethnic Kazakhs in China, Mongolia, former Soviet Union, Germany, and Turkey.

Turkish language: Turkish, the most spoken Turkic language, is the national language of Turkey and Northern Cyprus with 90 to 100 million speakers. It is also spoken in smaller groups worldwide, making it the 18th most spoken language globally.

Uzbek language: Uzbek language, a Turkic language spoken by Uzbeks, is the official language of Uzbekistan. It is the second most widely spoken Turkic language globally, with 32 million speakers. Uzbek has two major variants, Northern Uzbek and Southern Uzbek, each with multiple dialects. It belongs to the Karluk group of Turkic languages and is highly agglutinating, similar to Azeri.

Hungarian language: Hungarian is an official Uralic language spoken in Hungary and by Hungarian communities in neighboring countries. It is also one of the 24 official languages of the European Union.

English grammar: English grammar is the framework of rules governing the structure of the English language, encompassing words, phrases, clauses, sentences, and texts.

Journalism: Journalism involves producing and sharing reports on current events, facts, ideas, and individuals, aiming to inform society with a certain level of accuracy. It encompasses the occupation, information gathering methods, and various writing styles.

Photojournalism: Photojournalism is a form of journalism that uses still images or videos to convey news stories. It follows a strict ethical framework and aims to provide an honest and impartial representation of events. Photojournalists contribute to news media, helping communities connect and deliver news creatively in an informative and entertaining manner.

News: News is current event information conveyed through various media like word of mouth, print, broadcast, electronic communication, and eyewitness accounts. It is commonly described as "hard news" to distinguish it from softer media.

News media: The news media is a type of mass media that delivers news to the public. It includes news agencies, newspapers, magazines, and TV channels.

Mass media: Mass media refers to various forms of communication that target and connect with a wide audience through different media channels. It encompasses a broad range of media platforms used for mass communication purposes.

Cartoon: A cartoon is a visual art form that is often animated and drawn in an unrealistic or semi-realistic style. It can refer to images or illustrations intended for satire, caricature, or humor. Additionally, it can also refer to motion pictures that depend on a sequence of illustrations for animation. A person who creates cartoons is called a cartoonist, and in the context of animation, they are usually called an animator.

Censorship: Censorship involves suppressing speech and information that is seen as objectionable or inconvenient. It can be carried out by governments, private institutions, or controlling bodies.

Western (genre): The Western genre refers to a type of fiction set in the American frontier during the mid-19th to late 19th century. It often incorporates folk tales from the Western and Southwestern United States, as well as parts of Northern Mexico and Western Canada.

Publishing: Publishing involves making various forms of content available to the public, either for sale or for free. This encompasses printed works like books, newspapers, and magazines, as well as digital media such as ebooks, websites, and social media. The evolution of digital information systems has broadened the scope to include music and video game publishing.

Academic journal: An academic journal is a publication that focuses on scholarship within a specific academic discipline. It provides a platform for researchers to present, evaluate, and discuss their research. Peer review is commonly used to ensure the quality and credibility of the articles published.

Journal des sçavans: The Journal des sçavans is Europe's oldest academic journal, founded by Denis de Sallo. It is also considered the first scientific journal. Today, it primarily covers European history and premodern literature.

Nature(journal): Nature is a renowned scientific journal based in London, England. It publishes peer-reviewed research across various academic disciplines, with a primary focus on science and technology. With core editorial offices around the world, Nature is one of the most cited and esteemed academic journals globally. It boasts a substantial readership of approximately three million unique monthly readers online.

Philosophical Transactions of the Royal Society: The 'Philosophical Transactions of the Royal Society' is the longest-running scientific journal in the world, established in 1665. Initially a private venture, it became an official publication in 1752. The term 'philosophical' in the title refers to what is now known as science.

Science(journal): Science, also known as Science Magazine, is a prestigious academic journal published by the American Association for the Advancement of Science (AAAS). It has been in circulation since 1880 and is cherished as one of the top academic journals globally. With a weekly release, it boasts around 130,000 subscribers and reaches over 400,000 readers through institutional subscriptions and online access.

Magazine: A magazine is a periodic publication with diverse content, often financed by advertising, purchases, or subscriptions.

National Geographic: National Geographic is a renowned American magazine that started as a scholarly journal in 1888. Over time, it transformed into a popular magazine, known for incorporating pictures and later, color photos. During the Cold War, it aimed to provide an unbiased view of various nations' geography, including those behind the Iron Curtain. Today, National Geographic is recognized for its strong stance on environmental issues.

Playboy: Playboy is an iconic American men's magazine, established in 1953 by Hugh Hefner in Chicago. Originally print-based, it now operates online, embodying a men's lifestyle and entertainment theme. Hefner's mother provided a significant portion of funding through a $1,000 loan.

Scientific American: Scientific American, also known as SciAm or SA, is a renowned American popular science magazine. It has attracted contributions from notable scientists like Einstein and Tesla, and has featured over 150 Nobel Prize winners.

Time(magazine): Time is a renowned American news magazine that was published weekly for almost a century before transitioning to every other week in March 2020. Founded in New York City on March 3, 1923, it was led by its influential co-founder, Henry Luce, for many years.

Vogue(magazine): Vogue is a renowned American fashion and lifestyle monthly magazine, established in 1892 as a weekly newspaper. It covers a wide range of topics including haute couture fashion, beauty, culture, living, and runway. Located at One World Trade Center in Lower Manhattan, Vogue has featured countless celebrities and published its largest issue in September 2012, consisting of 900 pages featuring Lady Gaga on the cover.

Weekly Shōnen Jump: Weekly Shōnen Jump is a popular manga anthology published by Shueisha in Japan. It features action-packed manga series with elements of comedy. The magazine releases new chapters on a weekly basis, which are later compiled into tankōbon volumes every two to three months. Started in August 1968, it is one of the oldest and most enduring manga magazines.

Newspaper: A newspaper is a publication that provides written updates on current events, covering various topics such as politics, business, sports, art, and science. It often includes items like opinion columns, weather forecasts, local service reviews, birth announcements, obituaries, crosswords, editorial cartoons, comic strips, and advice columns.

The New York Times: The New York Times (NYT) is a national daily newspaper based in New York City. It is the second-largest newspaper by circulation in the US and one of the longest-running. Published by The New York Times Company, it has been chaired by the Ochs-Sulzberger family since 1896. The Times covers domestic, national, and international news and includes opinion pieces, investigative reports, and reviews.

The Wall Street Journal: The Wall Street Journal is a prominent American daily newspaper, established in 1889, and is widely recognized as a leading source of business and financial news. It is published by Dow Jones & Company and is available both in print and online. The newspaper is highly regarded and has received 39 Pulitzer Prizes, the most recent being in 2023.

The Washington Post: The Washington Post, known as the Post or WaPo, is an American newspaper published in Washington, D.C. It is highly circulated locally and has a national readership.

Le Monde: Le Monde is a prominent French daily afternoon newspaper, with an average circulation of 480,000 copies per issue in 2022. It has been accessible online since 1995 and is widely available in non-French-speaking countries. It is important to distinguish it from the monthly publication Le Monde diplomatique, of which Le Monde holds a 51% stake but maintains editorial independence.

The Times: The Times is a British daily newspaper founded in 1785. It is published in London and is considered to be centre-right politically. The newspaper and its sister publication, The Sunday Times, are owned by Times Media, a subsidiary of News UK, which is wholly owned by News Corp. The Times and The Sunday Times have had common ownership since 1966 but were founded independently.

The Hitchhiker's Guide to the Galaxy(radio series): The Hitchhiker's Guide to the Galaxy (radio series) is a science fiction comedy written by Douglas Adams. It aired in the UK in 1978 and then in the US and Canada. It was the first radio comedy in stereo and received numerous awards for its use of music and sound effects.

Documentary film: A documentary film is a non-fictional motion picture that aims to capture reality for educational, instructional, or historical purposes. It is a filmmaking practice with no clear boundaries defined by Bill Nichols, encompassing a variety of subjects and styles.

Television show: A television show is any content produced for viewing on a television set through broadcast or streaming services. It includes content made by broadcasters and film production companies, but excludes news, ads, and trailers. Shows are scheduled in advance and appear on TV listings, but can be accessed anytime on streaming platforms. They are produced through live tapings or animation/film productions. Shows can be made by different production companies.

Television broadcaster: A television broadcaster is a network that distributes television content to multiple stations or providers. It was once dominated by a few terrestrial networks, but now includes various platforms such as cable and satellite providers. Some well-known networks evolved from earlier radio networks.

Reality television: Reality television is a genre of unscripted TV that showcases real-life situations, usually with ordinary people. It became popular in the 1990s and gained prominence in the early 2000s with global franchises like Survivor, Idols, and Big Brother. These shows often include "confessionals" where cast members provide insight or commentary. Competition-based reality shows involve eliminating participants through judging panels, viewer votes, or contestant choices.

Game show: A game show is a type of broadcast entertainment where contestants compete for rewards. A host directs the show, explaining the rules and providing commentary. Game shows have been around since the late 1930s and became popular in the United States in the 1950s, becoming a regular feature of daytime TV.

Soap opera: A soap opera, or soap for short, is a long-running radio or television drama known for its melodrama, large cast, and sentimental storylines. The term comes from these dramas being sponsored by soap manufacturers. It was preceded by the derogatory term "horse opera" used for low-budget Westerns.

Talk show: A talk show is a type of television, radio, or podcast genre centered around spontaneous conversation. It differs from other programs as it features one person discussing various topics presented by a talk show host. These discussions can be interviews or simple conversations covering significant social, political, or religious matters. The host's personality sets the show's tone and style. Talk shows commonly adhere to an unwritten rule of "fresh talk", which means the conversation is either spontaneous or appears to be.

Sitcom: A sitcom is a comedy genre centered around a consistent set of characters that appear in multiple episodes. Unlike sketch comedy, sitcoms maintain the same characters throughout. This distinguishes sitcoms from stand-up comedy, where comedians tell jokes to an audience. Originally originating in radio, sitcoms have become a dominant form of narrative on television.

Emmy Awards: The Emmy Awards, or Emmys, are prestigious prizes recognizing artistic and technical excellence in American and international television. Held throughout the year, they have different ceremonies for various genres like primetime, daytime, children's & family, sports, news & documentary, technology & engineering, regional, and international programs. The Primetime and Daytime Emmy Awards are the most recognized and receive extensive media coverage.

BBC: The British Broadcasting Corporation (BBC) is a British public service broadcaster headquartered in London. It was originally established in 1922 as the British Broadcasting Company and adopted its current name in 1927. With over 21,000 employees, it is the oldest and largest local and global broadcaster. The BBC is known for its public-sector broadcasting.

Eurovision Song Contest: The Eurovision Song Contest (ESC) is an annual international song competition organized by the European Broadcasting Union. Participating countries submit original songs performed live and broadcasted through Eurovision and Euroradio networks. The competition involves countries voting for each other’s songs to determine a winner.

Doctor Who: Doctor Who is a long-running British sci-fi TV series that premiered in 1963. It follows the adventures of the Doctor, an extraterrestrial being from a humanoid species called Time Lords. Using a time-travelling spaceship named the TARDIS, disguised as a British police box, the Doctor explores the universe and different time periods. Along the way, the Doctor fights enemies and works to save lives and free oppressed peoples. The Doctor is frequently accompanied by companions.

Looney Tunes: Looney Tunes is an American animated franchise created by Warner Bros. It originated as a series of short films that aired from 1930 to 1969, along with its companion series Merrie Melodies. These cartoons introduced iconic characters like Bugs Bunny, Daffy Duck, and Porky Pig. The franchise was revived in the late 1970s, and new shorts were produced until 2014. In addition to the films, the term "Looney Tunes" now also encompasses the beloved characters themselves.

Star Trek: Star Trek is a celebrated American sci-fi franchise created by Gene Roddenberry in the 1960s. It has grown into a global pop-culture sensation, encompassing numerous films, TV shows, video games, novels, and comics. With its widespread success, it stands as one of the most iconic and lucrative media franchises ever.

Meet the Press: 'Meet the Press' is a weekly talk show on NBC, airing since 1947, making it the longest-running program in American television history. The show conducts interviews with prominent leaders and experts in politics, economics, foreign policy, and other public affairs. It also includes panel discussions offering opinions and analysis. The production recently shifted to NBC's Capitol Hill bureau in Washington, D.C.

Sesame Street: Sesame Street is a beloved American TV series for children, known for its mix of live-action, puppetry, and animation. Created by Joan Ganz Cooney and Lloyd Morrisett, it airs on PBS and has been running since 1969. The show uses Jim Henson's Muppets to convey messages through short films, cultural references, and humor. Despite some controversy, Sesame Street enjoys high viewership and is one of the longest-running shows globally.

The Simpsons: "The Simpsons" is a satirical animated sitcom, created by Matt Groening for the Fox Broadcasting Company. It portrays American life through the Simpson family, including Homer, Marge, Bart, Lisa, and Maggie, in the fictional town of Springfield. The show humorously exaggerates society, Western culture, television, and the complexities of being human.

Life: Life is the characteristic that distinguishes living matter from non-living matter. It involves biological processes, such as self-sustaining activities and signaling. Life is defined by its ability to maintain homeostasis, organize itself, metabolize, grow, adapt, respond to stimuli, and reproduce. Defining living systems, like viruses, can be challenging as they can only reproduce within host cells. Life exists all over Earth in air, water, and soil, with diverse ecosystems forming the biosphere. Some of these environments are extreme, hosting only extremophiles.

Death: Death is the end of all biological functions in an organism, including the brain, and decomposition follows shortly thereafter. It is an inevitable process that occurs in all organisms, but a few exceptions exist. Turritopsis dohrnii is biologically immortal but can still die from causes other than aging.

Suicide: Suicide is the intentional act of causing one's own death. Risk factors include mental disorders, physical disorders, and substance abuse. It can result from impulsivity due to stress, relationship problems, or harassment. Prior suicide attempts increase the likelihood of future attempts. Prevention efforts involve restricting access to lethal means, treating mental disorders and substance abuse, improving economic conditions, and using dialectical behaviour therapy. The effectiveness of crisis hotlines remains understudied.

Abiogenesis: Abiogenesis is the natural process where life originates from non-living materials. It involves the formation of a habitable planet, the synthesis of organic molecules, molecular self-replication, self-assembly, and the emergence of cell membranes. However, the transition from non-life to life has not been observed experimentally.

Organism: An organism is a living system composed of cells and functions as an individual life form. It is the minimal functional unit of life and possesses traits such as noncompartmentability, individuality, and distinctness. These traits involve the organism's structure, genetic uniqueness, autonomy, and open-system genetic information.

Model organism: A model organism is a non-human species studied extensively to unlock biological secrets that can provide insights into other organisms. They are particularly useful in researching human diseases when ethical or practical considerations prevent direct human experimentation. This is made possible by the shared heritage and conservation of genes and developmental processes across evolution.

Biology: Biology is the study of life, encompassing the understanding of cells, genetics, evolution, energy processing, and organism regulation. It explores the unity and diversity of living organisms, highlighting their interconnectedness and ability to transmit hereditary information across generations.

Microbiology: Microbiology is the study of microorganisms, including single-celled, multicellular, and acellular forms. It encompasses sub-disciplines such as virology, bacteriology, protistology, mycology, immunology, and parasitology.

Mycology: Mycology is the study of fungi, covering topics like taxonomy, genetics, biochemical properties, and their various uses by humans. Fungi serve as a source of tinder, food, traditional medicine, entheogens, poison, and can cause infections.

Evolution: Evolution is the process of heritable changes in biological populations over time. It is driven by factors like natural selection and genetic drift, which act on genetic variations. As a result, certain traits become more or less common in a population over generations. This process has led to the diversity of life at all levels of biological organization.

History of life: The history of life on Earth involves the evolution of living and fossil organisms, starting from the earliest emergence of life till present day. Earth formed about 4.5 billion years ago and evidence suggests that life emerged before 3.7 billion years ago. Some controversy remains regarding possible non-biological formation of early fossils.

Neuroscience: Neuroscience is the scientific study of the nervous system and its functions, incorporating various disciplines such as anatomy, physiology, psychology, and molecular biology. It seeks to understand the fundamental properties of neurons, glia, and neural circuits, with an emphasis on learning, memory, behavior, perception, and consciousness. This field presents a significant challenge in the biological sciences.

Sense: A sense is a biological system that helps organisms gather information about the world through the detection of stimuli. While traditionally five human senses were identified, more senses are now recognized. Non-human organisms have even greater variety of senses. Sense organs collect stimuli and transform them into a form that can be understood by the brain. Sensation and perception are vital for an organism's cognition, behavior, and thought.

Amber: Amber is fossilized tree resin admired for its color and beauty since ancient times. It serves as a gemstone and is crafted into various decorative items. People also use amber in jewelry and traditional medicine for healing purposes.

Ivory: Ivory is a hard, white material made from the teeth and tusks of animals. It consists mainly of dentine, the physical structure of teeth and tusks. Ivory contains mineralized collagen structures. The trade in teeth and tusks other than elephant is widespread, so "ivory" can describe any mammalian teeth or tusks of commercial interest that are large enough for carving or scrimshawing.

Pearl: A pearl is a hard, glistening object formed inside the soft tissue of certain animals. It consists of calcium carbonate deposited in concentric layers, and can be round or baroque in shape. Natural pearls are highly valued gemstones due to their rarity and beauty, symbolizing something valuable and admirable.

Paleontology: Paleontology is the scientific study of life before and during the Holocene epoch. It involves classifying organisms based on fossils and understanding their interactions in past environments. The term originated in 1822 from the Greek words for "old," "being," and "study." The field traces its history back to ancient times and gained prominence in the 18th and 19th centuries thanks to Georges Cuvier's work on comparative anatomy.

Fossil: A fossil is the preserved remains or traces of a past living organism from a geological age. They can include bones, shells, imprints, and even DNA remnants. Fossils collectively make up the fossil record.

Phylogenetics: Phylogenetics is the study of the evolutionary history and relationships between groups of organisms. It uses different methods, like analyzing DNA sequences or morphology, to create a phylogenetic tree that represents the evolutionary history of a group.

Binomial nomenclature: Binomial nomenclature is a formal naming system in taxonomy that assigns a two-part Latin-based name to each species. This scientific name, also known as a binomen, consists of a genus and a specific epithet. It is widely used to classify living organisms and is sometimes referred to as a Latin name. The system is called binominal nomenclature and is recognized by the International Commission on Zoological Nomenclature (ICZN).

Taxonomy (biology): Taxonomy is the scientific study of naming and classifying living organisms based on their shared characteristics. It involves grouping organisms into categories called taxa and organizing them in a hierarchical manner. Carl Linnaeus, a Swedish botanist, is considered the founder of modern taxonomy, developing a system known as Linnaean taxonomy for categorizing and naming organisms using a binomial nomenclature.

Domain (biology): In biology, a domain is the highest taxonomic rank that categorizes all organisms. It was introduced in the three-domain system by Woese, Kandler, and Wheelis in 1990.

Kingdom (biology): In biology, a kingdom is a high taxonomic rank, below domain. It categorizes organisms into groups known as phyla.

Species: A species is the largest group of organisms that can successfully reproduce and produce fertile offspring. It is an essential unit for classification, biodiversity, and understanding an organism. Species can be defined by various factors such as genetics, physical traits, behavior, or ecological role. Paleontologists rely on the concept of chronospecies when studying fossils.

Biomechanics: Biomechanics is the study of the mechanics of living organisms, including their structure, function, and motion. It examines biological systems at various levels, from whole organisms down to cells and organelles. Applying the principles of mechanics, biomechanics is a field within biophysics.

Anatomy: Anatomy is the study of the structure of organisms and their parts. It is an old science with roots in prehistoric times. This branch of natural science is closely tied to developmental biology, embryology, comparative anatomy, evolutionary biology, and phylogeny. Anatomy and physiology are related disciplines that explore the structure and function of organisms and their parts. Human anatomy is a fundamental science used in medicine.

Dissection: Dissection is the act of studying the anatomical structure of a deceased animal or plant by dismembering its body. Autopsies are used to determine the cause of death in humans. It is commonly taught in middle school and high school biology classes using preserved plants and small animals, while medical students perform extensive dissections on fresh and preserved human cadavers in subjects like anatomy, pathology, and forensic medicine. Dissections are usually conducted in morgues or anatomy labs.

Organ (biology): An organ in biology consists of different types of tissues that work together to carry out a specific function. It serves as a structural unit between tissues and organ systems. Tissues are made up of the same type of cells, while organs are formed by combining different types of tissues. Organ systems are created when two or more organs collaborate to perform a particular function in the body.

Tissue (biology): Tissue, in biology, exists between cells and organs, comprised of cells and their extracellular matrix with a shared function and embryonic origin. Multiple tissues combine to form organs.

Sexual dimorphism: Sexual dimorphism refers to the differences in physical traits or behaviors between males and females of the same species, which are not directly related to reproduction. This condition is common in most animals and some plants. Examples of these differences may include size, weight, color, markings, or cognitive traits. Competition for reproduction has led to the evolution of various sexually dimorphic traits, like aggressive utility traits used as weapons or passive displays for attracting mates. These differences can be subtle or pronounced and are influenced by both sexual and natural selection. In contrast, monomorphism occurs when both sexes have similar physical characteristics.

Head: A head is the main part of an organism containing ears, brain, forehead, cheeks, chin, eyes, nose, and mouth. It aids in functions like sight, hearing, smell, and taste. Although simple animals may lack a head, many symmetric forms have one regardless of size.

Thorax: The thorax is a part of the human and animal anatomy located between the neck and abdomen. It is the middle division of the body in insects, crustaceans, and extinct trilobites, made up of multiple segments.

Abdomen: The abdomen is the body part between the chest and pelvis in humans and other vertebrates. It is the front section of the torso's abdominal segment and contains the abdominal cavity. In arthropods, it is the posterior body tagma following the thorax or cephalothorax.

Circulatory system: The circulatory system, also known as the cardiovascular system or vascular system, is a network of organs, including the heart, blood vessels, and blood, that circulates throughout the body. It consists of two circuits: the systemic circulation, responsible for supplying oxygen and nutrients to all tissues, and the pulmonary circulation, which transports oxygen-depleted blood to the lungs for oxygenation. The terms cardiovascular and vascular systems are often used interchangeably with the circulatory system.

Blood: Blood is a crucial body fluid in humans and other vertebrates that carries nutrients and oxygen to cells and removes waste products. It is referred to as peripheral blood and contains peripheral blood cells.

Red blood cell: Red blood cells (RBCs), or erythrocytes, are the most abundant type of blood cell. They deliver oxygen to tissues through the circulatory system by taking it up in the lungs (or gills in fish) and releasing it while passing through capillaries. RBCs lack a nucleus and are also known as red cells or haematids. Their scientific name is derived from the Greek words for red and hollow vessel.

White blood cell: White blood cells (leukocytes) are immune cells that defend the body against infections and foreign agents. They comprise granulocytes, lymphocytes, and monocytes as the main subtypes.

Artery: Arteries are blood vessels that carry oxygenated blood away from the heart to different parts of the body. However, there are exceptions like the pulmonary arteries, which carry deoxygenated blood to the lungs for oxygenation, and the umbilical arteries, which transport deoxygenated blood to the placenta in fetal circulation.

Capillary: Capillaries are the smallest blood vessels in the body, only 5 to 10 micrometers in diameter. They consist of a thin wall made of simple squamous endothelial cells and are part of the microcirculation system. Capillaries allow for the exchange of substances between the blood and surrounding interstitial fluid. They carry blood from small arteries to small veins and facilitate the passage of various substances such as water, oxygen, carbon dioxide, and waste products. Lymph capillaries connect with larger lymph vessels to drain lymphatic fluid from the microcirculation system.

Vein: Veins are blood vessels that carry blood towards the heart in the circulatory system. They mostly transport deoxygenated blood from tissues back to the heart, except for pulmonary and fetal circulations which carry oxygenated blood to the heart. Arteries carry oxygenated blood away from the heart, while veins return deoxygenated blood to the heart in the deep veins.

Heart: The heart is a muscular organ that pumps blood through blood vessels, supplying oxygen and nutrients to the body and removing metabolic waste. It is roughly the size of a closed fist and is located in the middle compartment of the chest, known as the mediastinum.

Lymphatic system: The lymphatic system is an organ system in vertebrates that is part of the immune system and complements the circulatory system. It includes a network of lymphatic vessels, lymph nodes, and organs, as well as lymph fluid. Lymph fluid is a clear liquid that is transported back to the heart for recirculation. The word "lympha" refers to the deity of fresh water in Latin.

Spleen: The spleen, present in most vertebrates, functions as a blood filter. It resembles a large lymph node and its name is derived from the Ancient Greek word "σπλήν (splḗn)."

Endocrine system: The endocrine system is a messaging system in organisms where hormones are released by glands into the bloodstream to regulate distant organs. In vertebrates, the hypothalamus controls all endocrine systems.

Adrenal gland: The adrenal gland is an endocrine gland that produces hormones, such as adrenaline, aldosterone, and cortisol. Located above the kidneys, it consists of an outer cortex that produces steroid hormones and an inner medulla. The adrenal cortex is further divided into three zones: the zona glomerulosa, the zona fasciculata, and the zona reticularis.

Thyroid: The thyroid is an endocrine gland in vertebrates located in the neck, consisting of two connected lobes with an isthmus. It secretes three hormones: triiodothyronine (T3), thyroxine (T4), and calcitonin. These hormones regulate metabolism, protein synthesis, growth, and development in children, as well as calcium homeostasis. The thyroid is regulated by thyroid-stimulating hormone (TSH) from the anterior pituitary gland, which is in turn regulated by thyrotropin-releasing hormone (TRH) from the hypothalamus.

Mouth: The mouth is an orifice used by animals to eat and communicate. It is part of the oral cavity, which connects to the pharynx and nutrients pass through it. Invertebrates have lips and cheeks that bound the mouth, sometimes referred to as the buccal cavity, and a tongue inside. Most vertebrates possess teeth in their mouth, although some fish have teeth in their throat instead.

Esophagus: The esophagus is a tube in vertebrates that carries food from the throat to the stomach. It is about 25 cm long, located behind the trachea and heart, and passes through the diaphragm. Peristaltic contractions help move food along the esophagus. During swallowing, the epiglottis prevents food from entering the larynx and lungs. The word "esophagus" comes from Ancient Greek, meaning "to carry" + "I ate."

Liver: The liver is a vital organ found in vertebrate animals, including humans. It plays a crucial role in detoxification, protein synthesis, and digestion. It is located in the upper right abdomen, protected by the ribs. The liver also manages carbohydrate metabolism, hormone production, nutrient storage, and the breakdown of red blood cells.

Large intestine: The large intestine, or large bowel, is the final segment of the digestive system in animals with four limbs. It absorbs water and stores waste material in the rectum as feces before elimination through defecation. The colon is the longest part of the large intestine, and it is often used to refer to the entire large intestine, including the cecum, colon, rectum, and anal canal. However, some sources exclude the anal canal.

Small intestine: The small intestine is a vital organ in the gastrointestinal tract that absorbs nutrients from food. It receives bile and pancreatic juice to aid in digestion and is about 5.5 meters long, folding multiple times to fit in the abdomen. Despite its length, it is called "small" because it is narrower than the large intestine.

Pancreas: The pancreas is an organ in the abdomen behind the stomach. It acts as a gland with both endocrine and digestive functions. It regulates blood sugar levels by secreting insulin, glucagon, somatostatin, and pancreatic polypeptide. Additionally, it produces pancreatic juice containing bicarbonate and digestive enzymes to neutralize stomach acid and break down food in the duodenum.

Stomach: The stomach is a crucial part of the digestive system, found in humans and other animals. It is a muscular, hollow organ that aids in digestion by breaking down food using enzymes and hydrochloric acid. The stomach plays a major role in the gastric phase of digestion after chewing.

Immune system: The immune system is a biological network that protects organisms from diseases by detecting and responding to a range of pathogens. It also recognizes and eliminates abnormal cells and objects. It has two major subsystems: the innate immune system, which has a preconfigured response to general situations, and the adaptive immune system, which learns to recognize specific molecules encountered before. Both subsystems use molecules and cells to carry out their functions.

Antibody: An antibody, also known as an immunoglobulin, is a large protein used by the immune system to identify and neutralize foreign objects like bacteria and viruses. It recognizes unique molecules on pathogens and binds to them with precision. This binding allows the antibody to tag the pathogen for attack by the immune system or neutralize it directly.

Integumentary system: The integumentary system includes an animal's skin and its appendages. It acts as a physical barrier, protecting and maintaining the body from the external environment. It is mainly the outer skin of the body.

Breast: The breast is a prominence found on the upper ventral region of a primate's torso. It develops in both females and males from the same embryological tissues.

Feather: Feathers are unique, epidermal growths on birds and certain dinosaurs. They make up a complex outer covering known as plumage. Feathers are the most complex integumentary structures in vertebrates and an important characteristic of birds that sets them apart from other living groups.

Fingerprint: A fingerprint is a mark formed by the ridges on a human finger. It is important in forensic science for identifying individuals. Fingerprints are left on surfaces when the finger is moist or greasy. Ink or other substances can be used to create a complete fingerprint on a smooth surface. Fingerprints are typically obtained from the pad on the last joint of fingers and thumbs, and sometimes from lower joint areas of the fingers.

Fur: Fur is the hair covering the skin of mammals, comprising of oily guard hair on top and insulating underfur beneath. It protects against moisture and provides warmth.

Hair: Hair is a protein filament that grows from follicles in the skin. It is a defining characteristic of mammals. Besides areas of smooth skin, the entire human body is covered in follicles that produce thick and fine hair. Apart from its growth and types, hair is a crucial protein-based biomaterial composed mainly of alpha-keratin.

Nail (anatomy): Nails are protective plates found at the tips of primate digits, similar to claws in other animals. They are composed of a tough protein called alpha-keratin, also found in the claws, hooves, and horns of vertebrates.

Scale (anatomy): Scales, found in zoology, are small protective plates that grow from an animal's skin. They also serve as coloration plates on the wings of lepidopterans (insects). Scales are widespread, having evolved independently multiple times through convergent evolution, showcasing different structures and functions.

Skin: Skin is a vital layer of tissue that covers the body of vertebrate animals. It serves three main purposes: safeguarding, regulating, and enabling sensation.

Muscular system: The muscular system consists of skeletal, smooth, and cardiac muscles that enable body movement, maintain posture, and circulate blood. It is controlled by the nervous system and, along with the skeletal system, forms the musculoskeletal system responsible for body movement.

Muscle cell: A muscle cell, or myocyte, is a mature cell in animal muscles. Humans have three types: skeletal, smooth, and cardiac. Skeletal muscle cells, also known as muscle fibers, are long and have multiple nuclei. They develop from embryonic myoblast precursor cells.

Sarcomere: A sarcomere is the fundamental unit of muscle tissue, connecting two Z-lines. It is composed of filaments that slide past each other during muscle movement. Sarcomeres make up myofibrils, which are the building blocks of muscle fibers. They are recognizable under a microscope as alternating dark and light bands. The costamere is a separate structure that links the sarcomere to the sarcolemma.

Skeletal muscle: Skeletal muscles, organs of the vertebrate muscular system, are attached to bones by tendons. They consist of long muscle cells known as fibers and have a striated appearance due to the arrangement of sarcomeres.

Nervous system: The nervous system is a complex part of an animal that coordinates actions and senses environmental changes. It consists of the central nervous system (brain and spinal cord) and the peripheral nervous system (nerves). The peripheral nervous system has somatic, autonomic, and enteric subsystems. The autonomic system has sympathetic and parasympathetic branches, while the enteric system controls the gastrointestinal system. The nervous system arose about 550 to 600 million years ago in wormlike organisms. It uses motor and sensory nerves to transmit signals and is divided into cranial and spinal nerves.

Central nervous system: The central nervous system (CNS) includes the brain, spinal cord, retina, optic nerve, and olfactory nerve and epithelia. It integrates information, influences body activity, and is present in bilaterally symmetric animals. It is composed of nervous tissue along the body axis with an enlarged section at the rostral end called the brain. Only arthropods, cephalopods, and vertebrates have a true brain, but precursor structures exist in other organisms.

Peripheral nervous system: The Peripheral Nervous System (PNS) is the part of the nervous system that connects the brain and spinal cord to the rest of the body. It includes nerves and ganglia located outside the brain and spinal cord. Its primary function is to relay information between the central nervous system and organs and limbs. Unlike the central nervous system, the PNS is not protected by the vertebral column, skull, or blood-brain barrier, making it vulnerable to toxins.

Brain: The brain is a central organ in the nervous system that controls various bodily functions. It is the largest cluster of neurons in the body and is typically located in the head. The brain regulates endocrine systems, processes sensory information, controls movement, and contributes to intelligence development.

Brainstem: The brainstem is the part of the brain connecting the cerebrum and diencephalon with the spinal cord. It consists of the midbrain, pons, and medulla oblongata. The midbrain is connected to the thalamus.

Cerebellum: The cerebellum is a key part of the hindbrain in all vertebrates. It is smaller than the cerebrum but plays a crucial role in motor control. It may also be involved in attention, language, and emotion regulation. The cerebellum receives sensory input and coordinates fine motor activity. Damage to the cerebellum can lead to disorders in movement and motor learning.

Cerebral cortex: The cerebral cortex is the outer layer of neural tissue in the brain, consisting mostly of the six-layered neocortex. It is divided into two cortices by the longitudinal fissure and joined by the corpus callosum. It is the largest site of neural integration in the central nervous system and plays a crucial role in cognition, including attention, perception, memory, language, and consciousness.

Cerebrum: The cerebrum is the largest part of the brain, located at the uppermost region of the central nervous system. It includes the cerebral cortex and subcortical structures like the hippocampus, basal ganglia, and olfactory bulb. The cerebrum develops from the forebrain and is divided into left and right cerebral hemispheres.

Neuron: A neuron is an electrically excitable cell that transmits electric signals called action potentials through a neural network. It communicates with other cells through synapses, using neurotransmitters to transmit signals between cells.

Spinal cord: The spinal cord is a long, tubular structure made of nervous tissue that extends from the brainstem to the lower back. It is hollow and contains cerebrospinal fluid, covered by meninges and enclosed by neural arches. Along with the brain, it forms the central nervous system.

Sensory nervous system: The sensory nervous system processes sensory information and consists of sensory neurons, neural pathways, and the brain. It includes senses such as vision, hearing, touch, taste, smell, balance, and visceral sensation. Sense organs convert data to the mind, allowing people to interpret and perceive the outside world.

Auditory system: The auditory system is responsible for the sense of hearing. It comprises the sensory organs and the auditory parts of the sensory system.

Ear: The ear is the organ responsible for hearing and body balance. It consists of three parts: the outer ear, middle ear, and inner ear. The outer ear includes the pinna and ear canal. The middle ear contains the tympanic cavity and ossicles. The inner ear contains structures like the semicircular canals, utricle, saccule, and cochlea, which enable balance, eye tracking, and hearing. The ear is self-cleaning through the production of earwax. Ears are placed symmetrically on each side of the head, aiding sound localization.

Hearing: 'Hearing' refers to the ability to detect sounds through an ear by perceiving vibrations as changes in surrounding medium pressure. The academic discipline dedicated to studying hearing is auditory science.

Taste: Taste is the sense responsible for flavor perception. It occurs when chemicals in the mouth react with taste receptors on taste buds, mostly on the tongue. Along with smell and nerve stimulation, taste determines food flavors. Humans have taste receptors on taste buds, tongue, and epiglottis. The gustatory cortex is responsible for taste perception.

Tongue: The tongue is a muscular organ in the mouth that aids in chewing, swallowing, and tasting food. It is covered by taste buds and lingual papillae, and is moistened by saliva. The tongue is essential for speech and vocalization and also helps to clean teeth.

Olfactory system: The olfactory system is responsible for the sense of smell. It is a sensory system found in mammals and reptiles. It has two parts: the main olfactory system, which detects airborne substances, and the accessory olfactory system, which senses fluid-phase stimuli.

Nose: A nose is a protrusion in vertebrates that houses the nostrils, which take in and expel air for respiration. It is located centrally on the face in humans and serves as an alternate respiratory passage during infancy. The nose also contains the olfactory mucosa and sinuses, and air passes through the nasal cavity into the rest of the respiratory system. The distinctive separate protruding nose found in therian mammals evolved from the upper jaw of reptilian-like ancestors.

Sense of smell: The sense of smell, or olfaction, detects smells and has various functions like identifying food, dangers, and pheromones. It also plays a part in the sense of taste.

Somatosensory system: The somatosensory system is a network of neural structures that allows us to perceive touch, temperature, body position, and pain. It is part of the sensory nervous system which also encompasses other senses like vision, hearing, smell, taste, and balance.

Pain: Pain is a distressing feeling caused by intense or damaging stimuli. It is an unpleasant sensory and emotional experience associated with actual or potential tissue damage, as defined by the International Association for the Study of Pain.

Visual system: The visual system is the combination of the sensory organ and parts of the central nervous system that enable organisms to see and perceive their environment. It detects and interprets information from the visible spectrum to form a representation of the surroundings. The visual system performs various tasks, including light reception, color vision, depth perception, object identification, motion perception, and visual information integration. It also encompasses visual perception, which involves the processing of visual information, and visual impairment or blindness in case of abnormalities. Additionally, it includes non-image forming functions like the pupillary light reflex and circadian photoentrainment.

Eye: Eyes are organs that provide living organisms with vision and the ability to process visual detail. They detect and convert light into electro-chemical impulses in neurons. In higher organisms, eyes are complex systems that collect and regulate light, focus it through lenses to create images, convert images into electrical signals, and transmit these signals to the brain. Different species have various types of eyes, with image-resolving eyes found in molluscs, chordates, and arthropods.

Visual perception: Visual perception is the interpretation of the environment through various types of vision, such as color, low light, and normal vision. It involves processing visible light reflected by objects. This is distinct from visual acuity, which measures clarity of vision. People can experience difficulties with visual perception despite having good eyesight.

Color vision: Color vision is the ability to perceive differences in light frequencies regardless of intensity. It is mediated by a complex process involving neurons and photoreceptors in the visual system. This ability is found in various animals and is influenced by evolutionary history. In primates, color vision has evolved for tasks such as finding food, detecting camouflage, and recognizing emotional states in other primates.

Reproductive system: The reproductive system, also called genital system, consists of organs involved in sexual reproduction. It includes fluids, hormones, and pheromones. Differentiated species exhibit significant sexual differences, enabling genetic material exchange and potentially enhancing offspring's genetic fitness.

Sex organ: Sex organs, also called reproductive organs, are involved in sexual reproduction. They are responsible for producing and transporting gametes, facilitating fertilization, and supporting the development and birth of offspring. Found in various species, their features vary depending on the species.

Female reproductive system: The female reproductive system consists of internal and external sex organs involved in reproducing offspring. It develops from immaturity at birth to maturity during puberty. Internal organs include the vagina, uterus, fallopian tubes, and ovaries, which can be susceptible to infections. The vagina facilitates sexual intercourse and childbirth, connecting to the uterus. The uterus supports embryo development and produces secretions to aid sperm transport to the fallopian tubes, where fertilization occurs. External sex organs, known as the vulva, include the labia, clitoris, and vaginal opening.

Clitoris: The clitoris is a female sex organ found in mammals, ostriches, and a few other animals. In humans, it is located at the front junction of the labia minora, above the urethral opening. Unlike the male penis, the clitoris does not contain the distal portion of the urethra and is not used for urination. It usually lacks reproductive function in most species, but the spotted hyena has a large clitoris used for urination, mating, and giving birth. Some other mammals, like lemurs and spider monkeys, also have a large clitoris.

Ovary: The ovary is a female reproductive organ that produces eggs and releases them into the fallopian tube. It is found on both sides of the body and secretes hormones that regulate the menstrual cycle and fertility. The ovary undergoes changes from prenatal development to menopause and functions as an endocrine gland by producing different hormones.

Placenta: The placenta is a temporary organ that develops during pregnancy. It facilitates exchange of nutrients, gases, and waste between mother and fetus. It also produces hormones that regulate both maternal and fetal physiology. It connects to the fetus via the umbilical cord and is expelled from the uterus after birth. Placentas are found in placental mammals, marsupials, and some non-mammals with varying levels of development.

Uterus: The uterus is a vital organ in the female reproductive system, responsible for supporting the development of embryos and fetuses until birth. It is a hormone-responsive sex organ that produces uterine milk to nourish the developing embryos.

Vagina: The vagina is a flexible, muscular part of the female reproductive system in mammals. In humans, it stretches from the vestibule to the cervix and is partially covered by the hymen. The cervix protrudes into the vagina, allowing for sexual intercourse and childbirth. Additionally, it facilitates menstrual flow during the menstrual cycle of humans and related primates.

Male reproductive system: The male reproductive system comprises external and internal sex organs involved in human reproduction, located both outside the body and within the pelvis.

Penis: A penis is a male sexual organ found in many animals, used for inseminating females during copulation. It exists in both vertebrates and invertebrates, but not in all species. Additionally, penises may not have common ancestry.

Testicle: A testicle is the male gonad responsible for producing sperm and testosterone. It is equivalent to the female ovary. Testosterone release is regulated by luteinizing hormone from the anterior pituitary, while sperm production is controlled by both follicle-stimulating hormone and gonadal testosterone.

Respiratory system: The respiratory system is a biological system for gas exchange in animals and plants. It consists of organs like the lungs, which contain millions of small air sacs called alveoli or atria. These sacs have a rich blood supply and communicate with the external environment through airways, such as the trachea and bronchioles. Breathing pumps air into the alveoli or atria, facilitated by the muscles of respiration.

Gill: A gill is a respiratory organ used by aquatic organisms to extract oxygen from water and release carbon dioxide. Some species, like hermit crabs, can adapt their gills to respire on land when moist. Gills provide a large surface area for gas exchange and are also known as branchia in zoology.

Lung: The lungs are vital organs in the respiratory system that extract oxygen from the air and release carbon dioxide. They are located near the backbone and work to facilitate gas exchange in humans and most animals. The pleurae reduce friction during breathing, enabling effortless movement of the lungs.

Skeleton: A skeleton is a structural frame that supports the body of animals. It can be classified into three types: exoskeleton, which is a rigid outer shell; endoskeleton, a rigid internal frame; and hydroskeleton, a flexible internal structure supported by body fluids.

Bone: Bones are rigid organs found in vertebrate animals, serving to protect organs, produce blood cells, store minerals, provide support and structure, enable movement, and possess complex internal and external structures. They are lightweight, strong, and versatile, fulfilling multiple essential functions.

Jaw: Jaws are opposable structures at the entrance of the mouth used for grasping and manipulating food. They are part of the body plan of humans and most animals, constituting the vault of the mouth and enabling its opening and closing.

Joint: A joint is the connection between bones or other hard structures in the body, allowing for different types of movement. Some joints, like the knee and shoulder, are self-lubricating and can handle heavy loads while moving smoothly. Other joints, such as those in the skull, have limited movement to protect the brain and sense organs. Joints can be classified structurally and functionally.

Pelvis: The pelvis is the lower part of the trunk, containing the embedded skeleton and located between the abdomen and thighs.

Skull: The skull is a protective bone cavity for the brain, consisting of cranial bones, facial bones, ear ossicles, and the hyoid bone. The cranium and the mandible are the most noticeable parts. It is located at the front of the skeleton and is responsible for housing the brain and sensory structures like the eyes, ears, nose, and mouth. In humans, these sensory structures are part of the facial skeleton.

Vertebral column: The vertebral column, or backbone, is the main part of the skeleton in vertebrate animals. It consists of a series of segmented bones called vertebrae that replace the notochord found in all chordates. These vertebrae are separated by fibrocartilaginous discs. The dorsal part of the vertebral column contains the spinal canal, which protects the spinal cord.

Connective tissue: Connective tissue is a primary animal tissue that develops from the mesenchyme. It is found throughout the body, including the nervous system and meninges. Composed of various components, it includes elastic and collagen fibers, ground substance, and cells. Specialized fluid connective tissues like blood and lymph are also considered part of connective tissue. Common cell types found in connective tissue are fibroblasts, adipocytes, macrophages, mast cells, and leucocytes.

Cartilage: Cartilage is a resilient and smooth connective tissue, covered by the perichondrium membrane. It protects bones at joints and is found in body parts like the rib cage and intervertebral discs. It is less flexible than muscle and harder than bone. The matrix of cartilage contains glycosaminoglycans, proteoglycans, collagen fibers, and sometimes elastin. It grows faster than bone.

Tendon: A tendon is a strong and flexible connective tissue that links muscles to bones, carrying the force from muscle contractions to the skeletal system.

Epithelium: Epithelium is a protective layer of tightly packed cells without much space in between. It lines the outer surfaces of organs, blood vessels, and inner cavities. The epidermis, which is the outer layer of the skin, is an example of epithelial tissue. It is one of the four basic types of animal tissue, along with connective tissue, muscle tissue, and nervous tissue. Epithelial tissue lacks blood or lymph supply but is supported by nerves.

Muscle: Muscle is a type of soft tissue found in animals that allows for movement. It is formed during embryonic development and contains contractile proteins like actin and myosin, which enable muscle contractions. Additionally, muscle tissue includes regulatory proteins like troponin and tropomyosin.

Nervous tissue: Nervous tissue, or neural tissue, is the primary component of the nervous system. It regulates and controls body functions through two parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord, while the PNS includes the branching peripheral nerves. This tissue is composed of neurons, or nerve cells, which receive and transmit impulses, and neuroglia, or glial cells, which aid in impulse propagation and provide nutrients to neurons.

Bladder: The bladder is a hollow organ that stores urine before it is eliminated through urination. It is distensible and located on the pelvic floor. Urine enters through the ureters and exits through the urethra. An average adult bladder holds around 300 to 500 ml of urine.

Kidney: The kidneys are reddish-brown bean-shaped organs that filter blood in humans. They are located in the retroperitoneal space, about 12 centimetres in length. Each kidney is connected to a ureter, which carries urine to the bladder.

Urinary system: The urinary system, or urinary tract, includes the kidneys, ureters, bladder, and urethra. It eliminates waste, regulates blood volume and pressure, controls electrolyte and metabolite levels, and maintains blood pH. The kidneys filter blood and produce urine, which is carried by the ureters to the bladder for storage and excretion through urination. The male and female urinary systems differ only in urethra length.

Plant anatomy: Plant anatomy is the study of the internal structure of plants. It used to include plant morphology, but now focuses solely on internal plant structure. This field explores plant anatomy at the cellular level using tissue sectioning and microscopy techniques.

Plant morphology: Plant morphology is the study of a plant's physical form and external structure. It helps in visually identifying plants and is distinct from plant anatomy, which focuses on internal structure. Recent molecular biology studies have explored the molecular processes that determine plant morphology, including how conservation patterns in gene expression mark important stages in the plant life cycle and potentially restrict evolutionary diversification.

Flower: A flower is the reproductive structure in flowering plants. It consists of sepals to protect the flower, petals to attract pollinators, and reproductive organs that produce gametophytes. Male gametophytes produce sperm in pollen grains, while female gametophytes are contained in ovules produced in the carpels.

Fruit: A fruit is a structure in flowering plants that develops from the ovary after flowering and contains seeds.

Berry (botany): A berry is a fleshy fruit from a single flower's ovary, without a stone. Common examples include grapes, tomatoes, and bananas. The outer layer of the ovary wall ripens into a potentially edible "pericarp". Berries can be formed from one or more carpels. Seeds are typically found in the fleshy interior, but some exceptions exist, like Capsicum species with air instead of pulp around their seeds.

Nut (fruit): A nut is a fruit with a hard or tough shell protecting an edible kernel. In culinary terms, many dry seeds are called nuts, but in a botanical sense, a nut refers to a shell that doesn't open to release the seed.

Leaf: A leaf is a plant appendage specialized for photosynthesis. It is part of the shoot system and collectively called foliage. Leaves usually have a flattened shape with distinct upper and lower surfaces. They contain chlorophyll, which gives them a green color and absorbs light energy for photosynthesis. Some leaves have palisade mesophyll on both sides, making them isobilateral. A leaf with lighter-colored or white patches is called a variegated leaf.

Root: Roots are plant organs that anchor and nourish the plant by absorbing water and nutrients, enabling plants to grow quickly and tall. They are usually found underground but can also grow above the ground or water.

Stoma: A stoma, or stomate, is a pore in plant tissues that controls gas exchange. It is bordered by guard cells that regulate the opening size.

Seed: A seed is a plant embryo and food reserve enclosed in a protective outer covering called a seed coat. It is the product of a fertilized ovule, and grows within the mother plant before growth is halted. The term "seed" can also refer to anything that can be sown, such as seed and husk or tuber.

Shrub: A shrub is a small-to-medium-sized perennial woody plant with persistent woody stems above the ground. They can be deciduous or evergreen and are shorter in height compared to trees, typically less than 6-10 m tall. Some smaller shrubs, less than 2 m tall, are known as subshrubs. Shrubs can be found in various botanical groups, and some have species that are trees or herbaceous plants instead.

Tree: A tree is a perennial plant with an elongated trunk that supports branches and leaves. It includes woody plants with secondary growth and those usable as lumber. Taller palm trees, tree ferns, bananas, and bamboos are also considered trees.

Plant stem: A plant stem is a primary structure of a vascular plant, along with the root. It provides support to leaves, flowers, and fruits, transports water and nutrients, enables photosynthesis, stores nutrients, and produces new tissue. It is also referred to as halm, haulm, or culms.

Bark (botany): Bark is the outermost layer of woody plants, including trees, vines, and shrubs. It consists of the tissues outside the vascular cambium and is composed of the inner and outer bark. The inner bark is alive and includes the innermost layer of the periderm, while the outer bark is dead and covers the stems' surface. The outer bark on trees, known as the rhytidome, lies outside the living periderm.

Trunk (botany): The trunk in botany refers to the main wooden axis of a tree. It is crucial for identifying tree species and varies in appearance from the bottom to the top.

Epidermis (botany): The epidermis in botany is a single layer of cells that covers the leaves, flowers, roots, and stems of plants. It acts as a protective barrier against water loss, facilitates gas exchange, secretes metabolic compounds, and absorbs water and nutrients. The upper and lower leaf surfaces have different constructions and functions. Some stems produce the periderm, a secondary covering that replaces the epidermis for additional protection.

Ground tissue: Ground tissue refers to plant tissues that are neither dermal nor vascular. It is divided into three types based on cell wall characteristics. Parenchyma cells have thin walls and remain alive after maturity, providing filler tissue. Collenchyma cells have thin walls with some thickened areas, offering mechanical support. Sclerenchyma cells have thick, lignified walls and provide the main structural support.

Meristem: Meristem is a plant tissue composed of undifferentiated cells that can divide. It has the potential to develop into various plant organs and tissues. Once cells in the meristem differentiate, they lose their ability to divide.

Vascular tissue: Vascular tissue is a conducting tissue in plants, composed of multiple cell types. It consists of xylem and phloem, which transport fluids and nutrients internally. The vascular tissue system includes two meristems: the vascular cambium and the cork cambium. It plays a crucial role in plant growth and maintenance.

Vascular cambium: The vascular cambium is the primary growth tissue found in the stems and roots of various plants. It produces secondary xylem towards the center and secondary phloem towards the outer surface.

Hypha: A hypha is a long, branching filamentous structure found in fungi, oomycetes, and actinobacteria. It serves as the primary mode of vegetative growth in most fungi, collectively forming a mycelium.

Mycelium: Mycelium is the root-like structure of a fungus made up of branching hyphae. It forms colonies on various substrates, including soil. When two compatible mycelia join, they form a dikaryotic mycelium which can give rise to fruiting bodies like mushrooms. Mycelium can range from microscopic to covering vast areas. It functions like a human brain by sending electrical signals to mushrooms, conveying information and alerting to potential threats.

Physiology: Physiology is the study of how living systems function and their mechanisms. It explores the chemical and physical processes carried out by organisms, organs, cells, and biomolecules. This field can be divided into medical, animal, plant, cell, and comparative physiology based on classes of organisms.

Circadian rhythm: A circadian rhythm is a natural 24-hour cycle that regulates biological processes in organisms. It is controlled by a circadian clock that coordinates these processes for optimal fitness. These rhythms exist in various life forms and evolved independently in animals, plants, fungi, and cyanobacteria.

Digestion: Digestion is the process of breaking down large food compounds into smaller, water-soluble components that can be absorbed into the bloodstream. It involves two main processes: mechanical digestion, which physically breaks down food, and chemical digestion, where enzymes break down food into usable compounds. Absorption of these smaller substances occurs primarily in the small intestine.

Excretion: Excretion is the elimination of metabolic waste from an organism. Vertebrates excrete waste mainly through the lungs, kidneys, and skin. Unlike secretion, excretion serves the purpose of eliminating waste rather than performing specific functions. It is vital for all forms of life. Mammals, for instance, expel urine through the excretory system, specifically the urethra. In unicellular organisms, waste products are discharged directly through the cell's surface.

Blood sugar level: Blood sugar level, also known as blood glucose level, is the amount of glucose present in the blood. It is tightly controlled by the body to maintain metabolic balance.

Metabolism: Metabolism is the set of chemical reactions in organisms that converts food into energy for cellular processes, builds proteins and other molecules, and eliminates waste. It allows organisms to grow, reproduce, and respond to their environment. This term can also encompass all the chemical reactions in living organisms, including digestion and transportation between cells.

Muscle contraction: Muscle contraction is the activation of tension-generating sites in muscle cells. It does not always cause muscle shortening, as tension can be produced without change in length. Muscle relaxation follows contraction, returning the muscle fibers to a low tension-generating state.

Photosynthesis: Photosynthesis is a process used by organisms to convert light energy into chemical energy stored in organic compounds. It produces oxygen and stores energy in carbohydrate molecules. Most plants, algae, and cyanobacteria perform photosynthesis and are called photoautotrophs. This process is responsible for maintaining Earth's oxygen levels and providing energy for complex life.

Respiration (physiology): Respiration is the process of exchanging oxygen and carbon dioxide between the environment and cells in tissues.

Thermoregulation: Thermoregulation is the ability of organisms to regulate their body temperature despite fluctuations in the surrounding temperature. It is a part of homeostasis, which is the body's effort to maintain internal stability. Hyperthermia occurs when the body temperature rises above normal, while hypothermia happens when the body temperature drops below normal. Wet-bulb temperature exceeding 30.55°C can cause heat stress. Thermometers have enabled the measurement of animal temperatures, revealing variations across different body parts. Typically, the rectum is considered the most accurate reflection of internal temperature.

Transpiration: Transpiration is the passive process in which plants move water through their structures and evaporate it from leaves, stems, and flowers. This process helps to cool plants, regulate osmotic pressure, and enable the flow of mineral nutrients. When plant roots absorb less water than is lost through evaporation, plants close tiny pores called stomata to reduce water loss. This, in turn, slows nutrient uptake, limits CO2 absorption, and hampers metabolic processes, photosynthesis, and growth.

Developmental biology: Developmental biology is the study of how animals and plants grow and develop. It includes the biology of regeneration, asexual reproduction, metamorphosis, and the growth and differentiation of stem cells in adults.

Development of the human body: The development of the human body is the process of growth from conception to adulthood. It begins with fertilization, followed by cell division and differentiation. The embryo implants in the uterus and goes through fetal development until birth. After birth, growth and development continue influenced by genetic, hormonal, environmental, and other factors, impacting both physical and psychological aspects throughout life.

Cuticle: A cuticle is a protective outer covering found in organisms, providing toughness and flexibility. It can be of different types, distinguished by their origin, structure, function, and chemical composition.

Embryo: An embryo is the earliest stage of a multicellular organism's development. It starts after the fusion of sperm and egg cells, forming a single-celled zygote. The zygote then undergoes multiple cell divisions creating blastomeres, forming a solid ball called a morula. The morula then develops a fluid-filled cavity known as a blastocoel, turning it into a blastula or blastocyst in mammals.

Fetus: A fetus is the developing offspring of an animal embryo. In humans, fetal development starts at around 9 weeks after fertilization and extends until birth. During this stage, all major body organs are present, but they are not yet fully developed or functional and may not be in their final position.

Imago: The imago is the final stage of an insect's metamorphosis, marking its maturity. This stage follows the last molting of immature instars. It is also referred to as the imaginal stage.

Larva: A larva is a juvenile form of many animals that undergoes metamorphosis into their next life stage. It is common in insects, amphibians, and cnidarians, with indirect development, during their life cycle.

Longevity: Longevity refers to exceptionally long-lived individuals in a population. It should not be confused with life expectancy, which is the statistical average number of remaining years at a certain age. For instance, a population's life expectancy at birth is the average age at death for all individuals born in a specific year.

Metamorphosis: Metamorphosis is a biological process involving a sudden and significant change in an animal's body structure through cell growth and differentiation. It occurs during birth, hatching, or transformation, and is observed in insects, fish, amphibians, mollusks, crustaceans, cnidarians, echinoderms, and tunicates. Metamorphosis is often accompanied by a change in nutrition source or behavior. Animals can undergo complete metamorphosis (holometaboly), incomplete metamorphosis (hemimetaboly), or no metamorphosis (ametaboly).

Moulting: Moulting, also called molting or shedding, is a biological process where an animal sheds parts of its body for a beneficial purpose. This can occur at specific times of the year or points in the animal's life cycle. In many invertebrates, moulting is known as ecdysis.

Nymph (biology): In biology, a nymph is an immature form of certain invertebrates, mainly insects, that gradually transforms into an adult through multiple stages called instars. Nymphs resemble adults but lack wings and do not go through a pupal stage. They moult until their final stage, where they become adult insects.

Ontogeny: Ontogeny is the process of an organism's origin and development from fertilization to adulthood. It can also refer to the study of an organism's entire lifespan.

Puberty: Puberty is the process by which a child's body transforms into an adult body capable of sexual reproduction. It is triggered by hormonal signals from the brain to the ovaries in females and testicles in males. Hormones produced by these organs stimulate growth, brain development, and the transformation of various body parts. This includes changes in the brain, bones, muscles, blood, skin, hair, breasts, and sex organs. As puberty progresses, there is a significant acceleration in physical growth, leading to the development of an adult body. Before puberty, primary sexual characteristics differentiate males and females, while puberty further brings about secondary sex characteristics that distinguish the sexes.

Pupa: A pupa is a life stage of some insects in which they transform from immature to mature stages. This stage is part of the four distinct stages in an insect's life cycle, namely egg, larva, pupa, and imago. Hormones play a crucial role in initiating and completing the pupal stage. The process of becoming a pupa is known as pupation, while the emergence from the pupal case is called eclosion or emergence.

Tadpole: A tadpole is the larval stage in an amphibian's life cycle. It is usually fully aquatic but can also be found on land. Tadpoles have fish-like features like gills, a lateral line, and swimming tails. During metamorphosis, they develop lungs and their diet shifts significantly.

Reproduction: Reproduction is the process of creating new organisms from existing ones. It can be either asexual or sexual.

Asexual reproduction: Asexual reproduction does not involve the fusion of gametes or change in chromosomes. Offspring inherit all genes from a single parent, making them genetically and physically similar or exact clones of the parent. It is the primary reproduction method for single-celled organisms and is common in plants, animals, and fungi. Parthenogenesis is a common form of asexual reproduction in vertebrates, used when reproductive opportunities are limited. Some reptiles, like Komodo dragons and monitor lizards, can reproduce asexually.

Sex: Sex is the trait that determines whether an organism produces male or female reproductive cells. Through sexual reproduction, these cells fuse to form an offspring that inherits traits from both parents. Organisms producing small, mobile gametes are called male, while those producing larger, non-mobile gametes are called female. Some organisms, like certain plants, can produce both types of gametes and are called hermaphrodites.

Sexual reproduction: Sexual reproduction combines two sets of chromosomes from gametes, resulting in a diploid zygote. Animals mainly use this method, but plants, fungi, and other eukaryotes show variations in chromosome sets during sexual reproduction.

Female: Summary: Females are organisms that produce the ovum, which is the gamete that merges with the male gamete during sexual reproduction.

Male: Male is the sex that produces sperm and requires the female ovum for sexual reproduction. While some organisms can reproduce both sexually and asexually, males generally have a Y chromosome that promotes the development of male reproductive organs and higher testosterone levels.

Microbial cyst: A microbial cyst is a dormant stage of a microorganism where metabolic processes slow down and all activities like feeding and movement cease. Many microbes can enter this state of suspended animation.

Spore: Spores are reproductive units in biology that can reproduce sexually or asexually. They are adapted for dispersal and survival in unfavorable conditions for extended periods of time. Spores are found in the life cycles of many plants, algae, fungi, and protozoa.

Egg: An egg is an organic vessel produced by animals for incubating and developing a fertilized egg cell into a self-sufficient animal fetus.

Birth: Birth, or parturition, is the act of giving birth to offspring. Hormones trigger contractions of the uterus, leading to the expulsion of the fetus, which can feed and breathe independently.

Semen: Semen, also known as seminal fluid, is an organic bodily fluid containing spermatozoa. It is produced in the seminal vesicle and released during ejaculation. Besides sperm, seminal fluid contains enzymes, fructose, and other components that aid in sperm survival and movement. Its purpose is to fertilize the female ovum by allowing sperm to travel through the vagina and into the uterus.

Sperm: Sperm is the male reproductive cell found in animals, red algae, fungi, and plants. It can be motile with a tail or non-motile. Animals produce motile sperm called spermatozoa, while red algae and fungi produce non-motile spermatia. Flowering plants have non-motile sperm inside pollen, and ferns and gymnosperms possess motile sperm.

Pregnancy: Pregnancy is when offspring develop inside a woman's uterus. It can involve multiple offspring, like twins.

Childbirth: Childbirth, or labor, is the process of delivering one or more babies from the mother's body either through vaginal delivery or caesarean section. It is estimated that around 140.11 million human births occurred worldwide in 2019. Developed countries predominantly rely on hospital deliveries, whereas home births are more common in developing countries.

Menstrual cycle: The menstrual cycle involves hormonal changes and uterine and ovarian activities, enabling pregnancy. The ovarian cycle regulates egg production, estrogen, and progesterone release. The uterine cycle prepares and maintains the uterus lining for implantation. These cycles typically last 21-35 days, with a median of 28 days, occurring for around 30-45 years.

Menopause: Menopause refers to the permanent cessation of menstrual periods, signaling the end of reproductive years, commonly occurring between the ages of 45 and 55. It can arise naturally or be induced by factors like smoking, certain surgeries, or chemotherapy. Menopause occurs due to a decline in estrogen and progesterone hormone production by the ovaries. Diagnosis can be confirmed through hormone level measurements. Menopause is opposite to menarche, which is the onset of a girl's periods.

Plant reproduction: Plant reproduction is the creation of new plants through sexual or asexual methods. Sexual reproduction involves combining gametes to generate genetically diverse offspring. Asexual reproduction leads to identical plants without gamete fusion unless mutations happen.

Alternation of generations: Alternation of generations is a common life cycle in plants and algae. It involves a multicellular haploid phase (gametophyte) and a multicellular diploid phase (sporophyte).

Gametophyte: A gametophyte is a multicellular organism that develops from a haploid spore and is one of the phases in the life cycles of plants and algae. It is the sexual phase that produces sex organs and gametes for fertilization. The fertilization results in a diploid zygote, which develops into a new multicellular organism called the sporophyte. This sporophyte can produce haploid spores that germinate into new gametophytes.

Plant reproductive morphology: Plant reproductive morphology studies the physical form and structure of plant parts involved in sexual reproduction. It explores the features related to plant reproduction.

Pollen: Pollen is a powdery substance produced by flowers for sexual reproduction. It contains male gametes protected by a hard coat. If it reaches a compatible pistil or female cone, it germinates and transfers sperm to the ovule. Studying pollen, called palynology, is useful in various fields. Pollen enables the transfer of genetic material between flowers for cross-pollination or within the same flower for self-pollination.

Pollination: Pollination is the process where pollen is transferred from a plant's anther (male part) to its stigma (female part), leading to fertilization and seed production. This is usually done by animals like insects, birds, and bats, as well as wind and water. Pollinating animals carry pollen between plants, crucial for genetic diversity in most flowering plants. Self-pollination happens within a single flower, while cross-species pollination can create hybrids in nature and plant breeding.

Sporophyte: A sporophyte is a diploid stage in the plant or alga life cycle that produces asexual spores. It alternates with a haploid gametophyte phase.

Biochemistry: Biochemistry is the study of chemical processes in living organisms, involving the fields of structural biology, enzymology, and metabolism. It explains living processes and contributes to understanding tissues, organs, and organism structure and function. It is closely connected to molecular biology and uses biochemical methods to uncover and develop all areas of life sciences.

Chemical biology: Chemical biology is an interdisciplinary field bridging chemistry and biology. It uses chemical techniques and small synthesized molecules to study and control biological systems. It is different from biochemistry as it applies chemical tools to understand biological phenomena.

Biomolecule: Biomolecules are essential molecules found in living organisms, playing crucial roles in various biological processes. They encompass large macromolecules like proteins, carbohydrates, lipids, and nucleic acids, as well as smaller molecules like vitamins and hormones. These biomolecules are necessary for cell division, development, and morphogenesis. While organisms produce their own biomolecules, they also require external sources of biomolecules, such as nutrients, to survive.

Alkaloid: Alkaloids are basic, naturally occurring organic compounds with at least one nitrogen atom. They can also have neutral or weakly acidic properties. Alkaloids may contain oxygen, sulfur, and sometimes elements like phosphorus, chlorine, and bromine. Some synthetic compounds can also be classified as alkaloids.

Caffeine: Caffeine is a stimulant that promotes wakefulness and enhances cognitive performance. It works by blocking adenosine receptors and increasing the release of acetylcholine. Additionally, it raises cyclic AMP levels through phosphodiesterase inhibition.

Cocaine: Cocaine is a stimulant that is widely used recreationally for its euphoric effects. It is obtained from South American Coca plants and can be administered through various methods such as snorting, topical application, and injection. Additionally, it has medicinal uses in Indigenous South American cultures and as a local anesthetic in developed countries. It can also be turned into a vapor for inhalation.

Morphine: Morphine is a powerful opiate derived from opium poppies. It is primarily used to relieve pain and can be administered through various methods. It acts directly on the central nervous system to alleviate pain and alter perception. Dependence and tolerance can develop with prolonged use. Morphine is commonly used for acute and chronic pain, including that caused by heart attacks, kidney stones, and childbirth. It reaches its maximum effect within 20 minutes when given by injection and within 60 minutes when taken orally. Long-acting forms of morphine are also available.

Nicotine: Nicotine is a natural alkaloid found in plants, commonly used as a stimulant and anxiety reliever. It is also used in pharmaceuticals to help people quit smoking by alleviating withdrawal symptoms. Nicotine acts as a receptor agonist in most nicotinic acetylcholine receptors but functions as a receptor antagonist in two specific receptor subunits.

Biological pigment: Biological pigments, also called pigments or biochromes, are produced by living organisms and create color through specific absorption. They encompass plant and flower pigments and are present in various structures like skin, eyes, feathers, and hair, residing in specialized cells called chromatophores. Some species accumulate pigments over extended periods of an individual's life.

Carotenoid: Carotenoids are organic pigments found in plants, algae, bacteria, archaea, and fungi, giving colors to various natural entities like pumpkins, carrots, corn, and daffodils. They can be classified as xanthophylls and carotenes, with over 1,100 identified variations.

Chlorophyll: Chlorophyll, derived from Greek words meaning "green leaf," is a green pigment found in cyanobacteria, algae, and plant chloroplasts. It enables plants to absorb light energy for photosynthesis.

Melanin: Melanin is a pigment found in organisms, made up of disordered oligomers or polymers. It is produced by melanocytes and provides pigmentation. Melanin is considered one of the last mysterious frontiers in biology.

Carbohydrate: Carbohydrates are biomolecules made up of carbon, hydrogen, and oxygen atoms, with an empirical formula of Cm(H2O)n. They have a hydrogen-oxygen atom ratio of 2:1. However, some carbohydrates may not strictly follow this stoichiometric definition, and not all chemicals that do are classified as carbohydrates.

Fructose: Fructose, also known as fruit sugar, is a ketonic simple sugar found in plants often combined with glucose to form sucrose. It is one of three monosaccharides absorbed into the bloodstream directly. In the liver, both fructose and galactose are converted into glucose, leaving glucose as the sole monosaccharide in circulating blood.

Glucose: Glucose is a highly prevalent sugar (C6H12O6) and the most abundant monosaccharide. It is primarily produced by plants and algae through photosynthesis, utilizing water, carbon dioxide, and sunlight. Glucose plays a crucial role in the formation of cellulose, the most abundant carbohydrate found in cell walls worldwide.

Lactose: Lactose is a disaccharide sugar found in milk, consisting of galactose and glucose subunits. It constitutes around 2-8% of milk by mass and is white, water-soluble, and non-hygroscopic. Lactose has a mildly sweet taste and is commonly used in the food industry.

Cellulose: Cellulose is a polysaccharide found in plants and algae, composed of D-glucose units. It forms the primary cell wall in green plants and some bacteria secrete it to make biofilms. Being the most common organic polymer on Earth, cellulose makes up 90% of cotton fiber, 40-50% of wood, and about 57% of dried hemp.

Chitin: Chitin is a durable polymer found in nature, second only to cellulose in abundance. It makes up cell walls in fungi, exoskeletons in arthropods, and various structures in molluscs, nematodes, and diatoms. It is also synthesized by certain fish and amphibians. Chitin is extracted from shellfish and crustacean shells, which are abundant in the seafood industry. Its structure is similar to cellulose and has similarities to the protein keratin. Chitin finds diverse applications in medicine, industry, and biotechnology.

Glycogen: Glycogen is a glucose-based energy storage molecule found in animals, fungi, and bacteria. In humans, it serves as the primary storage form of glucose in the body.

Starch: Starch is a polymeric carbohydrate made up of glucose units bonded together. It is produced by green plants as a way to store energy. It is the most common carbohydrate in human diets and can be found in staple foods like wheat, potatoes, corn, rice, and cassava.

Hormone: Hormones are signaling molecules that regulate physiology and behavior in multicellular organisms. They are crucial for the proper development of animals, plants, and fungi. Various molecules, including eicosanoids, steroids, amino acid derivatives, proteins or peptides, and gases, can be classified as hormones.

Adrenaline: Adrenaline, also known as epinephrine, is a hormone and medication involved in regulating bodily functions. It is produced by the adrenal glands and plays a crucial role in the fight-or-flight response. Adrenaline increases blood flow to muscles, heart output, pupil dilation, and blood sugar levels by binding to alpha and beta receptors. It is found in humans, animals, and some single-celled organisms. It has also been isolated from the Scoparia dulcis plant in Northern Vietnam.

Dopamine: Dopamine is a neuromodulatory molecule that functions as a neurotransmitter in the brain. It plays vital roles in the motivational component of reward-motivated behavior, as well as in motor control and hormone release. Dopamine is synthesized in the brain, kidneys, plants, and most animals. Its levels increase with anticipation of rewards and are impacted by addictive drugs. This neurotransmitter is part of a dopamine system that modulates various brain pathways and cell groups.

Estrogen: Estrogen is a sex hormone that plays a crucial role in the development and functioning of the female reproductive system and secondary sex characteristics. The three main types of estrogen are estrone, estradiol, and estriol, with estradiol being the most potent and abundant. Estetrol is an additional estrogen produced exclusively during pregnancy.

Insulin: Insulin is a peptide hormone produced by the pancreas that regulates the body's metabolism of carbohydrates, fats, and proteins. It promotes glucose absorption from the blood into various cells and regulates the synthesis of proteins. Insulin's high levels inhibit glucose production by the liver, while low levels promote catabolism and the breakdown of body fat.

Oxytocin: Oxytocin is a hormone and neuropeptide produced in the hypothalamus. It plays roles in behavior such as social bonding, reproduction, and childbirth. The hormone is released during sexual activity and labor, and is also available in pharmaceutical form. Oxytocin stimulates uterine contractions during childbirth and promotes maternal bonding and milk production. Its production is controlled by positive feedback, stimulating the release of more oxytocin. This hormone plays a similar role during lactation and sexual activity.

Testosterone: Testosterone is the primary male sex hormone responsible for the development of male reproductive organs and secondary sexual characteristics. It promotes muscle and bone growth, body hair, and affects behavior, mood, cognition, and metabolism. Insufficient testosterone levels in men may lead to various issues like frailty, weight gain, anxiety, sexual problems, and bone loss.

Plant hormone: Plant hormones are signal molecules produced in low concentrations within plants. They regulate plant growth, development, defense against pathogens, stress tolerance, and reproduction. Unlike animals, every plant cell can produce hormones. The term "phytohormone" was coined by Went and Thimann in 1937.

Lipid: Lipids are diverse organic compounds, including fats, waxes, and sterols. They serve as energy stores, cell membrane components, and signaling molecules. Lipids find applications in cosmetics, food, and nanotechnology.

Fat: Fat refers to esters of fatty acids or a combination of these compounds found in living organisms and food.

Fatty acid: A fatty acid is a type of carboxylic acid with a long, straight chain of carbon atoms. It can be either saturated or unsaturated. Most fatty acids found in nature have an unbranched chain with an even number of carbon atoms ranging from 4 to 28. While some organisms have fatty acids in their pure form, others have them as esters, specifically triglycerides, phospholipids, or cholesteryl esters. Fatty acids serve as a vital energy source for animals and play essential roles in cell structure.

Nucleic acid: Nucleic acids are essential biomolecules found in all cells and viruses. They consist of nucleotides, which have three components: a 5-carbon sugar, a phosphate group, and a nitrogenous base. There are two main types of nucleic acids: DNA and RNA. DNA is made up of deoxyribose sugar, while RNA contains ribose sugar.

DNA: DNA is a double helix polymer that carries genetic instructions for organisms and viruses. It is one of the four major macromolecules crucial for all life, along with proteins, lipids, and carbohydrates.

RNA: RNA is a vital molecule involved in various biological functions. It serves as a template for protein production and is crucial for all forms of life. It consists of nucleotides linked together, and messenger RNA conveys genetic information for protein synthesis. Additionally, some viruses utilize RNA as their genetic material.

Protein: Proteins are large biomolecules made up of amino acids. They have diverse functions, including catalyzing reactions, replicating DNA, responding to stimuli, providing structure, and transporting molecules. Each protein has a unique sequence of amino acids determined by its genes, and this sequence shapes its 3D structure and activity.

Amino acid: Amino acids are organic compounds with amino and carboxylic acid groups. There are over 500 types, but only 22 are essential for protein synthesis as they appear in the genetic code.

Enzyme: Enzymes are proteins that accelerate chemical reactions in living organisms. They convert substrates into different products, playing a crucial role in metabolic processes and sustaining life. Enzymes catalyze individual steps in metabolic pathways. Enzymology is the study of enzymes, which can also reveal pseudocatalytic properties of some enzymes that have lost their biological catalysis ability over evolution.

Hemoglobin: Hemoglobin is an iron-containing protein found in red blood cells that transports oxygen. It is present in almost all vertebrates except for certain fish and invertebrates. It carries oxygen from the respiratory organs to body tissues, enabling aerobic respiration and powering metabolism. A healthy human has 12 to 20 grams of hemoglobin in every 100 mL of blood. Hemoglobin is a metalloprotein, chromoprotein, and globulin.

Protein (nutrient): Proteins are vital nutrients for the body, serving as building blocks for tissue and a source of fuel. They provide the same energy density as carbohydrates but less than lipids. The amino acid composition is the key nutritional aspect of proteins.

Steroid: A steroid is a type of organic compound consisting of four fused rings arranged in a specific molecular structure.

Cholesterol: Cholesterol is a vital sterol found in the tissues of animals, particularly in the brain, spinal cord, and animal fats.

Molecular biology: Molecular biology is a field of biology studying the molecular foundation of biological processes within and between cells. It investigates vital aspects such as biomolecule synthesis, modification, mechanisms, and interactions.

Gene expression: Gene expression is the process where genetic information is used to create functional gene products, like proteins or non-coding RNA, which affects an organism's traits. It follows the central dogma of molecular biology and involves transcription, translation, and replication.

Genetic code: The genetic code is a set of rules that living cells use to convert genetic information into proteins. This process is carried out by the ribosome, which uses RNA molecules to assemble amino acids in a specific order based on the messenger RNA. The code is shared across organisms and can be represented in a table with 64 entries.

DNA replication: DNA replication is the biological process of making two identical copies of DNA from one original molecule. It is crucial for cell division, tissue repair, and genetic inheritance.

Transcription (biology): Transcription (biology) is the copying of DNA into RNA. DNA segments transcribed into mRNA encode proteins, while other segments produce non-coding RNAs.

Translation (biology): Translation in biology is the process of creating proteins using RNA molecules as templates. Amino acid sequences are determined by RNA nucleotide sequences, with each group of three nucleotides corresponding to a specific amino acid. This process is guided by the genetic code and carried out by ribosomes. Overall, translation is a vital part of gene expression in living cells.

Zoology: Zoology, derived from Ancient Greek, is the scientific study of animals. It encompasses the examination of animal structure, embryology, classification, habits, and distribution, including both living and extinct species. Zoology explores animal interactions within their ecosystems and is a significant branch of biology.

Animal: Animals are multicellular organisms in the Animalia kingdom. They breathe oxygen, consume organic material, have myocytes for movement, reproduce sexually, and develop from a blastula during embryonic growth.

Animal coloration: Animal coloration refers to the appearance of an animal caused by light reflection or emission. It varies greatly, with some animals being brightly colored and others being camouflaged. Certain species, like peafowls, have males with striking patterns, vibrant colors, and iridescence, while females are less noticeable.

Camouflage: Camouflage is the use of materials, coloration, or illumination to hide animals or objects by either making them hard to see or disguising them as something else. It includes methods like cryptic resemblance, disruptive coloration, and motion dazzle. Camouflage can also involve transparency, silvering, and countershading in the open ocean. Some animals can actively change their skin pattern and colors for camouflage or signaling. Plants may also use camouflage to avoid being eaten by herbivores.

Ethology: Ethology is a branch of zoology that scientifically studies non-human animal behavior in their natural environment, emphasizing its evolutionary adaptiveness. It originated from the work of naturalists and has evolved into a modern discipline through the contributions of influential scientists like Darwin, Tinbergen, Lorenz, and von Frisch. Ethology combines laboratory and field research, with connections to neuroanatomy, ecology, and evolutionary biology. Ethologists focus on behavioral processes rather than specific animal groups, often examining a particular behavior, such as aggression, across multiple species.

Intelligence: Intelligence is the multifaceted ability to understand, learn, reason, solve problems, and apply knowledge creatively. It involves perceiving and retaining information for adaptive behavior within a given context.

Sleep: Sleep is a altered state of reduced activity where consciousness and sensory activity are hindered. It involves decreased muscle activity and interaction with the environment. While less responsive than wakefulness, sleep still exhibits active brain patterns, setting it apart from coma or disorders of consciousness.

Hibernation: Hibernation is a seasonal state of minimal activity and reduced metabolism that some animals undergo, characterized by low body temperature, slow breathing and heart rate, and decreased metabolic rate. It primarily occurs during winter months.

Carnivore: A carnivore is an organism that obtains its energy by consuming animal tissues, obtained through hunting or scavenging.

Predation: Predation is the act of one organism killing and consuming another, known as prey. It falls under a category of feeding behaviors that includes parasitism and parasitoidism. Predation differs from scavenging and can overlap with herbivory when predators consume plant seeds or destroy fruits.

Scavenger: Scavengers are animals that feed on dead organisms not killed by predation. They consume carrion and also plant material. They play a vital role in the ecosystem by removing dead animal and plant material. Decomposers and detritivores consume the remains after scavengers have finished.

Herbivore: A herbivore is an animal adapted to eating plant material as its main diet. Their mouthparts are usually adapted for rasping or grinding. Examples include horses, which have wide flat teeth for grinding tough plant material.

Grazing: Grazing is an agricultural practice where livestock are allowed to freely roam and eat wild vegetation. This method helps animals convert cellulose from grass and forage into valuable products like meat, milk, and wool. Grazing is typically done on land that is unsuitable for crop farming.

Animal locomotion: Animal locomotion refers to the ways animals move. They use various self-propelled methods like running, swimming, jumping, flying, hopping, soaring, and gliding. Some animals rely on their surroundings for transportation, using passive methods like sailing, kiting, rolling, or riding other animals.

Bipedalism: Bipedalism is the movement of an animal or machine using its two rear limbs or legs. It includes walking, running, and hopping. Animals or machines that move this way are called bipeds, meaning 'two feet'.

Animal migration: Animal migration refers to the seasonal movement of animals over long distances. It is a widespread phenomenon among various animal groups such as birds, mammals, fish, reptiles, amphibians, insects, and crustaceans. Migration is triggered by factors like climate, food availability, mating, and occurs regularly in ecology.

Instinct: Instinct is a natural inclination of living organisms towards specific complex behaviors. It involves innate elements and is characterized by fixed action patterns (FAPs) where a defined stimulus triggers a sequence of unvarying actions.

Sociality: Sociality refers to the level at which animals within a population form social groups and cooperative societies.

Botany: Botany, also known as plant science, is the scientific study of plant life and is a branch of biology. It involves the examination of various plant species by experts called botanists or plant scientists. The term "botany" comes from an Ancient Greek word meaning pasture, herbs, grass, or fodder, which is derived from a word meaning to feed or graze. While traditionally including fungi and algae, botany now mainly focuses on around 410,000 species of land plants, including vascular plants and bryophytes.

Plant: Plants are eukaryotes in the kingdom Plantae, primarily photosynthetic. They derive energy from sunlight using chloroplasts and chlorophyll. However, parasitic plants lack chlorophyll and photosynthesis genes, obtaining energy from other plants or fungi.

Carnivorous plant: Carnivorous plants obtain nutrients by trapping and consuming animals and protozoans, mainly insects and arthropods. They still rely on photosynthesis for energy. These plants thrive in nutrient-poor environments such as acidic bogs and places with thin soil. They can be found on all continents except Antarctica and numerous Pacific islands. Charles Darwin's book in 1875, titled Insectivorous Plants, was the first to highlight the importance of carnivory in plants after thorough study and research.

Flowering plant: Flowering plants, or angiosperms, are the most diverse group of land plants. They bear flowers and fruits, and their seeds are enclosed within a fruit. This group includes grasses, trees, shrubs, vines, and most aquatic plants. With approximately 300,000 known species, they have 64 orders, 416 families, and 13,000 known genera.

Eudicots: Eudicots, also known as Eudicotidae or eudicotyledons, are a group of flowering plants. They are distinctive for having two seed leaves when they first sprout. The name is derived from the term Dicotyledons.

Magnoliids: Magnoliids are a large group of flowering plants, consisting of over 10,000 species. They include well-known plants like magnolias, nutmeg, and avocado. Magnoliids are the third-largest group of angiosperms after eudicots and monocots. They have trimerous flowers, pollen with one pore, and typically have branching-veined leaves.

Monocotyledon: Monocotyledons, also known as monocots, are angiosperms characterized by grass and grass-like flowering plants. Their seeds typically have only one embryonic leaf, or cotyledon. Monocots form a major group within flowering plants, while those with two cotyledons are classified as dicots.

Weed: A weed is an undesirable plant that grows where it conflicts with human preferences, needs, or goals. Weeds have characteristics that make them hazardous, aesthetically unappealing, or difficult to control in managed environments. They are unwanted in various areas including farm land, gardens, and parks. In agriculture, weeds can cause major losses in crop yields. Invasive species may also be considered weeds as they negatively impact ecosystem functioning and biodiversity.

Cell biology: Cell biology is the study of cells, which are the basic building blocks of all living organisms. It investigates the structure, function, and behavior of cells, including their metabolism, communication, and composition. Various techniques like microscopy, cell culture, and cell fractionation are used to understand cell functioning. Research in cell biology has implications for understanding larger organisms and has connections to fields like genetics, molecular biology, immunology, and medical microbiology. It is crucial for biomedical research and provides insights into diseases like cancer.

Programmed cell death: Programmed cell death, also known as PCD, refers to the death of a cell due to internal events like apoptosis or autophagy. It is a biological process that provides advantages in an organism's lifecycle. An example is the separation of fingers and toes in a human embryo, where cells between the fingers undergo apoptosis. PCD plays crucial roles in the development of both plant and animal tissues.

Cell signaling: Cell signaling is an essential biological process where cells communicate with each other, their own components, and their surroundings. It is a crucial aspect of cellular life found in both prokaryotes and eukaryotes.

Stem cell: Stem cells are versatile cells that can develop into different cell types and replicate indefinitely. Found in both embryonic and adult organisms, they exhibit distinct properties. Differing from progenitor and precursor cells, they are the earliest cells in a cell lineage, capable of unlimited division.

Cellular respiration: Cellular respiration is the metabolic process in cells that converts nutrients into ATP and releases waste products. It involves oxidizing biological fuels in the presence of an inorganic electron acceptor, such as oxygen, to produce energy-rich ATP molecules.

Glycolysis: Glycolysis is a metabolic pathway that converts glucose into pyruvate, producing energy in the form of ATP and NADH. It occurs within the liquid part of cells and involves ten enzyme-catalyzed reactions.

Fermentation: Fermentation is a metabolic process that uses enzymes to chemically transform organic substances. It can extract energy from carbohydrates without oxygen and can also improve the quality of food and beverages through the activity of microorganisms. The science behind fermentation is called zymology.

Active transport: Active transport is the movement of molecules or ions across a cell membrane against their concentration gradient, requiring cellular energy. It can be classified into primary active transport (using ATP) and secondary active transport (using an electrochemical gradient). This process differs from passive transport, as it involves energy expenditure for the movement of molecules or ions across the membrane.

Cell cycle: The cell cycle is a series of events in a cell that leads to its division into two daughter cells. These events involve DNA and organelle duplication, as well as the separation of cytoplasm, chromosomes, and other components during cell division.

Fission (biology): Fission in biology refers to the division of a single entity into two or more parts, which then regenerate into separate entities resembling the original. It can occur in cells, organisms, bodies, populations, or species. There are two types of fission: binary fission, where one organism produces two parts, and multiple fission, where one entity produces multiple parts.

Meiosis: Meiosis is a special type of cell division that produces gametes in sexually-reproducing organisms. It involves two rounds of division, resulting in four haploid cells with one copy of each chromosome. Meiosis also involves genetic crossover, creating new combinations of code on each chromosome. During fertilization, the haploid cells fuse to create a zygote with two copies of each chromosome again.

Mitosis: Mitosis is a cell division process in which replicated chromosomes are separated into two new nuclei. It is an equational division resulting in genetically identical cells with the same number of chromosomes. It occurs after the S phase of interphase and is followed by telophase and cytokinesis. The stages of mitosis define the division of the mother cell into two genetically identical daughter cells.

Plasmid: A plasmid is a small DNA molecule found outside the main chromosome in cells. It can replicate independently and is commonly seen in bacteria, but also in archaea and eukaryotes. Plasmids often carry genes that assist an organism's survival and provide resistance to antibiotics. Unlike chromosomes, plasmids are small and contain additional genes for specific situations. In molecular cloning, artificial plasmids are used as vectors to replicate recombinant DNA sequences. Plasmids can be introduced into cells for further study. Synthetic plasmids can be easily procured online.

Cell (biology): A cell is the fundamental unit of life, comprising of cytoplasm enclosed within a membrane. It contains macromolecules like proteins, DNA, RNA, and various small molecules. The term originates from the Latin word cellula meaning 'small room'.

Cell membrane: The cell membrane is a protective barrier in cells, made of a lipid bilayer with proteins and cholesterol. It controls what enters and leaves the cell and facilitates cellular processes such as adhesion and signaling. It also serves as the attachment surface for extracellular structures and can be artificially created in synthetic biology.

Cytoplasm: The cytoplasm is the material within a cell, excluding the nucleus. It consists of cytosol, organelles, and inclusions. It is predominantly water and lacks color.

Cytoskeleton: The cytoskeleton is a dynamic network of protein filaments found in all cells. It includes microfilaments, intermediate filaments, and microtubules, and extends from the nucleus to the cell membrane. This complex structure allows for rapid growth or disassembly, adapting to the cell's needs.

Flagellum: A flagellum is a hairlike structure found in plant and animal sperm, fungal spores, and various microorganisms, used for movement. It enables motility in many protists, which are called flagellates.

Symbiogenesis: Symbiogenesis is an evolutionary theory explaining how eukaryotic cells evolved from prokaryotes. It suggests that mitochondria and chloroplasts in eukaryotic cells originated from once independent prokaryotes that were engulfed by other cells in a process called endosymbiosis. Mitochondria are likely related to Rickettsiales bacteria, while chloroplasts are believed to have descended from cyanobacteria.

Organelle: Organelles are specialized subunits within cells that perform specific functions. The term organelle is derived from the idea that these structures are like organs in the body. They can either have their own lipid bilayers or be spatially distinct functional units. While most organelles are found within cells, some extend outside of cells and are still considered organelles, such as cilia, flagellum, archaellum, and trichocyst.

Cell nucleus: The cell nucleus is a membrane-bound organelle in eukaryotic cells. It usually consists of a single nucleus, but some cell types lack a nucleus. The nucleus is composed of the nuclear envelope, which encloses the organelle, and the nuclear matrix, which provides mechanical support.

Chromosome: A chromosome is a DNA package containing an organism's genetic material. It consists of long DNA fibers coated with nucleosome-forming proteins called histones. These proteins, along with chaperones, condense and preserve the DNA's integrity. Chromosomes also have a complex three-dimensional structure that plays a vital role in gene activation and regulation.

Centriole: A centriole is a cylindrical organelle made of tubulin protein. It is found in most eukaryotic cells but not in certain plant groups. Centrioles form a centrosome when paired and surrounded by dense material called pericentriolar material (PCM).

Endoplasmic reticulum: The endoplasmic reticulum (ER) is the transportation system and a crucial organelle in eukaryotic cells. It consists of the rough ER (RER), involved in protein folding, and the smooth ER (SER). These interconnected membranes form flattened sacs called cisternae and tubular structures. ER membranes are connected to the outer nuclear membrane but are absent in red blood cells and spermatozoa.

Golgi apparatus: The Golgi apparatus, also known as Golgi complex or Golgi body, is an organelle found in eukaryotic cells. It packages proteins into vesicles before sending them to their destination. It plays a crucial role in processing proteins for secretion, utilizing glycosylation enzymes to attach sugars. The Golgi apparatus is located at the intersection of secretory, lysosomal, and endocytic pathways within the cell.

Lysosome: A lysosome is a membrane-bound organelle in animal cells that contains enzymes for breaking down various biomolecules. It has a specific composition of proteins in its membrane and lumen. Operating at an acidic pH, lysosomes resemble the stomach's activity and are involved in degradation, cell processes like secretion and apoptosis, as well as energy metabolism.

Mitochondrion: A mitochondrion is a double-membrane organelle found in most eukaryotes that generates ATP through aerobic respiration, providing chemical energy to the cell. It was discovered in 1857 and is known as the "powerhouse of the cell".

Ribosome: Ribosomes are cellular machines that synthesize proteins by linking amino acids according to messenger RNA codons. They are composed of small and large subunits, consisting of ribosomal RNA molecules and proteins. These macromolecular structures, also known as the translational apparatus, are present in all cells.

Vacuole: A vacuole is a membrane-bound organelle found in plant, fungal, protist, animal, and bacterial cells. It is a compartment filled with water containing various molecules, including enzymes. Vacuoles can also contain solid material. They are formed by the fusion of membrane vesicles and their size and shape vary according to cell needs.

Plant cell: Plant cells are the cells found in green plants. They have primary cell walls with cellulose, hemicelluloses, and pectin. These cells contain plastids that perform photosynthesis and store starch. They have a large vacuole that regulates turgor pressure. Flagella and centrioles are absent, except in gametes. Plant cells divide using a unique method involving a cell plate or phragmoplast.

Cell wall: A cell wall is a structural layer outside the cell membrane, providing support, shape, protection, and acting as a selective barrier. It helps cells withstand osmotic pressure and mechanical stress. Cell walls are common in fungi, algae, plants, and most prokaryotes except mollicute bacteria.

Chloroplast: A chloroplast is a plastid organelle found in plant cells that conducts photosynthesis. Chlorophyll captures sunlight energy and converts it into ATP and NADPH, while releasing oxygen from water. These energy molecules are then used in the Calvin cycle to create organic compounds. Chloroplasts also have other functions like fatty acid and amino acid synthesis, as well as participating in the immune response. The number of chloroplasts per cell varies from one in unicellular algae to up to 100 in plants like Arabidopsis and wheat.

Plastid: Plastids are membrane-bound organelles found in plant, algae, and other eukaryotic cells. They are believed to have originated from endosymbiotic cyanobacteria and include chloroplasts, chromoplasts, and leucoplasts.

Ecology: Ecology is the study of living organisms and their relationship with the environment. It explores individuals, populations, communities, ecosystems, and the biosphere. Ecology is closely related to biogeography, evolutionary biology, genetics, ethology, and natural history.

Biome: A biome is a biological community shaped by the environment and regional climate, which can span across multiple continents. It encompasses various habitats, making it broader than the term "habitat".

Biodiversity: Biodiversity refers to the variety and variability of life on Earth, encompassing genetic, species, and ecosystem diversity. It is not evenly distributed, with higher levels found in the tropics and marine ecosystems along coasts in the Western Pacific. Biodiversity tends to cluster in hotspots and has been increasing historically, but deforestation poses a threat to its future. It encompasses the processes that sustain life, including evolution, ecology, and culture.

Competition (biology): Competition in biology refers to the interaction between organisms or species that compete for limited resources. It reduces the fitness of both organisms as one's presence diminishes the available resources for the other.

Symbiosis: Symbiosis is a close and long-term interaction between two different species, where they live together. It can be mutualistic (beneficial for both), commensalistic (beneficial for one, neutral for the other), or parasitic (beneficial for one, harmful for the other). The term was coined by Heinrich Anton de Bary in 1879, describing the living together of unlike organisms. It can also refer specifically to interactions where both symbionts contribute to each other's support.

Parasitism: Parasitism is a relationship where one species, the parasite, lives on or inside another organism, the host, causing harm. The parasite is structurally adapted to this lifestyle. Examples include protozoans causing malaria and dysentery, animals like lice and mosquitoes, fungi like ringworm, and plants like mistletoe and dodder.

Biosphere: The biosphere, or ecosphere, encompasses all ecosystems on Earth. It is the zone of life and integrates all living beings and their interactions with the lithosphere, cryosphere, hydrosphere, and atmosphere. The biosphere is a closed system for matter but open for energy, with photosynthesis capturing solar energy. It is believed to have emerged around 3.5 billion years ago through biopoiesis or biogenesis.

Ecological niche: An ecological niche refers to how a species adapts to its environment, including the resources available and competition with other species. It also describes how the species influences the environment in return. The specific factors involved can vary between species and contexts.

Ecosystem: An ecosystem is a system where environments and organisms interact. Biotic and abiotic components are connected through nutrient cycles and energy flows.

Endangered species: An endangered species is a species at high risk of extinction due to factors like habitat loss, poaching, and invasive species. The International Union for Conservation of Nature (IUCN) Red List tracks the conservation status globally, while other agencies assess species within specific regions. Many nations have laws protecting these species, prohibiting hunting and promoting conservation measures. Conservation efforts include captive breeding and habitat restoration.

Extinction: Extinction refers to the complete extinction of a group of organisms when its last member dies. In some cases, a group may become functionally extinct if it loses the ability to reproduce and recover. Determining the exact moment of extinction is challenging and often done retrospectively. This difficulty has led to instances like Lazarus taxa, where a species reappears unexpectedly after being presumed extinct.

Extremophile: An extremophile is an organism that thrives in extreme environments with conditions that challenge the limits of known life, including extreme temperature, radiation, salinity, or pH level.

Habitat: Habitat is the specific environment that provides the necessary resources for a particular species to survive and reproduce. It includes physical and biological factors within an area and can be considered the physical representation of a species' ecological niche. The term "habitat" differs from concepts like environment or vegetation assemblages, with "habitat-type" being more suitable for these broader concepts.

Invasive species: An invasive species is introduced to a new environment and becomes overpopulated, causing harm. It affects habitats and regions, leading to ecological, environmental, and economic damage. This term can also refer to native species that become harmful due to human-induced changes in their food web. Since the 20th century, invasive species have become a global threat, posing significant economic, social, and environmental challenges.

Population: The term 'Population' typically refers to the number of people in an area. Governments conduct censuses to measure the size of a resident population. It is also used to describe non-human organisms and has applications in fields like ecology and genetics.

Sustainability: Sustainability is a social goal aiming for long-term co-existence on Earth. It consists of three dimensions - environmental, economic, and social - with emphasis on countering major environmental issues. It guides decisions at various levels and is often used interchangeably with sustainable development, which emphasizes the processes to achieve sustainability. UNESCO differentiates the terms by associating sustainability with a long-term goal and sustainable development with the pathways to attain it.

Wildlife conservation: Wildlife conservation involves protecting wild species and their habitats to maintain healthy populations and restore ecosystems. Threats to wildlife include habitat destruction, overexploitation, poaching, pollution, climate change, and illegal trade. Thousands of species are at risk, with estimates ranging from 42,100 to a million. Ecosystems with endangered species are disappearing. National and international efforts, including conservation agreements like CITES and CBD, aim to preserve Earth's wildlife. NGOs like the Nature Conservancy and World Wildlife Fund also play a crucial role in conservation.

Genetics: Genetics is the study of genes, genetic variation, and heredity in organisms. It explores how traits are inherited and passed down from parents to offspring. Gregor Mendel, a 19th-century friar, was the first to scientifically study genetics. He discovered that traits are inherited through discrete units called genes, which remain a fundamental concept in genetics today.

Gene: In biology, a gene is both a basic unit of heredity and a sequence of nucleotides in DNA. Genes can be categorized into two types: protein-coding genes and non-coding genes.

Heredity: Heredity refers to the transfer of traits from parents to offspring through asexual or sexual reproduction, whereby offspring acquire genetic information from their parents. This process leads to genetic variations that can accumulate and drive species evolution through natural selection. The field of genetics studies heredity in biology.

Mendelian inheritance: Mendelian inheritance refers to the principles of biological inheritance proposed by Gregor Mendel and later rediscovered and popularized by other scientists. These principles initially faced controversy but were later integrated with the chromosome theory of inheritance and became the foundation of classical genetics. The combination of Mendelian inheritance and natural selection formed the basis for population genetics and the modern evolutionary synthesis.

Mutation: A mutation is a change in the DNA sequence of an organism's genome, viral genome, or extrachromosomal DNA. These changes can occur during replication or as a result of damage to DNA. Mutations can also be caused by the insertion or deletion of DNA segments due to mobile genetic elements.

Human genome: The human genome refers to the complete set of DNA sequences found in humans. It is composed of DNA in the chromosomes and mitochondria. The genome includes coding and non-coding DNA, which can encode proteins or have various other functions. Non-coding DNA consists of diverse elements such as regulatory sequences, structural regions, repetitive sequences, and non-functional pseudogenes. However, there is no consensus on the exact amount of non-functional junk DNA.

Epigenetics: Epigenetics is the study of heritable traits that occur without changes to DNA, involving changes in cell function. It encompasses features beyond traditional genetic mechanisms, affecting gene expression regulation. These changes persist through cell division and can be influenced by environmental factors or normal development. Epigenetic alterations have been linked to the development of cancer.

Hybrid (biology): A hybrid is the offspring of two organisms from different varieties, species, or genera through sexual reproduction. It contains genetic material from both parents and can exhibit hybrid vigor, growing larger than either parent. Hybrids are not always intermediate between parents. In animal and plant breeding, individual parentage is important, while in genetics, chromosome numbers are a focus. In taxonomy, the degree of relatedness between parent species is a crucial aspect.

Natural selection: Natural selection is the process by which individuals with favorable traits are more likely to survive and reproduce, resulting in the genetic characteristics of a population changing over time. It is a fundamental part of evolution and was first introduced by Charles Darwin. Unlike artificial selection, natural selection occurs without intentional human intervention.

Genetic drift: Genetic drift, or random genetic drift, refers to the random changes in the frequency of a gene variant in a population. This is caused by chance and can be described as the Wright effect.

Adaptation: Adaptation in biology refers to the process of natural selection that helps organisms fit into their environment, improving their evolutionary fitness. It is also a state achieved by a population during this process. Additionally, adaptation encompasses phenotypic traits in individual organisms that have evolved and are maintained through natural selection.

Human evolution: Human evolution is the process that led to Homo sapiens, a distinct species within the hominid family. It involved the development of traits like bipedalism, dexterity, and complex language. Human evolution was not linear but involved interbreeding with other hominins. The study of human origins, called anthropogeny, involves disciplines like physical anthropology, evolutionary anthropology, paleontology, and genetics.

Australopithecus: Australopithecus is a genus of early hominins that lived in Africa during the Pliocene and Early Pleistocene. It is an important member of the Australopithecina subtribe, which may also include Ardipithecus. Species within Australopithecus include A. garhi, A. africanus, A. sediba, and A. afarensis. It is debated whether some Australopithecus species should be classified under different genera. Homo, Paranthropus, and Kenyanthropus are believed to have evolved from certain Australopithecus species.

Paranthropus: Paranthropus, an extinct hominin genus, comprises two accepted species - P. robustus and P. boisei. The validity of Paranthropus is debated, and it is sometimes considered synonymous with Australopithecus. These robust australopithecines lived around 2.9 to 1.2 million years ago, spanning the end of the Pliocene to the Middle Pleistocene.

Homo habilis: Homo habilis, an extinct archaic human species, lived in East and South Africa from about 2.31 million years ago to 1.65 million years ago. Initially controversial, it gained recognition as a distinct species over time. It was proposed to be a human ancestor, evolving into Homo erectus and eventually modern humans. Some specimens were later divided into "H. rudolfensis" and "H. gautengensis", with the former receiving more support.

Homo erectus: Homo erectus was an ancient human species that lived during the Pleistocene, about 2 million years ago. They are considered early members of the Homo genus.

Denisovan: Denisovans (di-NEE-sə-və) were an extinct archaic human species in Asia during Paleolithic times. Limited physical remains exist, so most knowledge comes from DNA evidence. More complete fossil material is needed to establish a formal species name.

Neanderthal: Neanderthals, or cavemen, were an extinct species of archaic humans living in Eurasia until 40,000 years ago. Neanderthal 1, the type specimen, was discovered in Germany's Neander Valley in 1856.

Cro-Magnon: Cro-Magnons were the first early modern humans in Europe, arriving around 56,800 years ago. They interbred with Neanderthals but left no genetic legacy in modern Europeans. A second wave of modern humans formed a single founder population around 37,000 years ago, contributing ancestry to present-day Europeans. They developed Upper Palaeolithic cultures, including the Aurignacian and Gravettian. The Last Glacial Maximum caused climatic changes, leading to the split of the Gravettian into the Epi-Gravettian and Solutrean. As Europe warmed, the Magdalenian culture emerged around 20,000 years ago, eventually being replaced by Mesolithic cultures.

Arthropod: Arthropods are invertebrates with an exoskeleton made of chitin. They have a segmented body and jointed appendages. The process of moulting allows them to grow. With over 10 million species, they are a highly diverse group.

Bilateria: Bilateria is a major group of animals known as bilaterians, recognized by their bilateral symmetry during embryonic development. They have a body plan centered around a longitudinal axis with front and rear ends, as well as a symmetrical belly and back. While most bilaterians maintain this symmetry as adults, echinoderms are an exception, developing pentaradial symmetry. Cephalization, where sense organs and nerve ganglia concentrate in the front of the body, is a prominent feature among bilaterians.

Chordate: A chordate is a type of animal belonging to the phylum Chordata. It is characterized by five unique physical traits: a notochord, a hollow dorsal nerve cord, an endostyle or thyroid, pharyngeal slits, and a post-anal tail. The name "chordate" comes from the notochord, which plays a crucial role in their body plan and movements. Chordates are bilaterally symmetric, have a coelom, a closed circulatory system, and exhibit metameric segmentation.

Craniate: A craniate is a chordate animal with a hard bone or cartilage skull. Living craniates include hagfish, hyperoartia, and gnathostomata. Previously excluding hagfish, recent research has now considered them as vertebrates, making craniates synonymous with vertebrates.

Gnathostomata: Gnathostomata refers to jawed vertebrates and comprises around 60,000 species, representing 99% of all living vertebrates, including humans. These animals possess opposing jaws, true teeth, and paired appendages. They also have distinct physiological and cellular traits such as myelin sheaths in neurons and an adaptive immune system with discrete lymphoid organs. The inner ear of gnathostomes contains a horizontal semicircular canal, and their antigen recognition sites are generated through V(D)J recombination.

Invertebrate: Invertebrates are animals without a backbone. They do not have a vertebral column, which evolved from the notochord. Invertebrates include a wide range of animals, such as arthropods, mollusks, annelids, echinoderms, flatworms, cnidarians, and sponges. They form a paraphyletic group, excluding vertebrates.

Tetrapod: A tetrapod refers to any four-limbed vertebrate animal. This superclass includes both living and extinct amphibians and amniotes. Amniotes have evolved into two major groups: sauropsids and synapsids. Some tetrapods, like snakes and caecilians, have lost their limbs due to mutations in the Hox gene, but may still retain remnant hindlimbs.

Vertebrate: Vertebrates are animals with a backbone made of bones or cartilage. This includes fish, amphibians, reptiles, birds, and mammals. They are part of the subphylum Vertebrata and make up the majority of the phylum Chordata, with approximately 69,963 known species.

Domestic short-haired cat: Domestic short-haired cats are cats with short fur that do not belong to any recognized breed. They are commonly known as moggies in the United Kingdom. Unlike specific breeds, they are not registered with cat breed registries. Domestic short-haired cats are the most common type of cat in the United States, making up about 96% of the cat population. They are also referred to as house cats or alley cats.

Siamese cat: The Siamese cat is a recognized breed that originated from Thailand. It became popular in Europe and North America in the 19th century. The modern-style Siamese has distinct features like blue almond-shaped eyes, a triangular head, large ears, and a slender and muscular body. There are also traditional Siamese cats with rounder heads. The breed is described as affectionate, intelligent, and playful, seeking human interaction and enjoying the company of other cats.

American Brahman: The American Brahman is a breed of beef cattle in the United States. It was developed from Indian cattle, mainly Gir, Guzerá, and Nelore, with some other breeds. The Brahman is known for its ability to tolerate heat, sunlight, and humidity, as well as its resistance to parasites. It has been exported to many countries and is the most common breed in Australia. The Brahman has also been used to create other hybrid breeds such as Brangus and Brahmousin.

Hereford cattle: The Hereford cattle is a British beef breed from Herefordshire in England. It was developed through selective breeding by families in Herefordshire from the mid-18th century, predating Robert Bakewell's notable work.

Holstein Friesian: The Holstein Friesian is a highly popular breed of dairy cattle found in over 160 countries. Originating in northern Germany and Dutch provinces, it is dominant in industrial dairy farming globally. Also known as Holstein, Friesian or Black and White, it is recognized for its milk production capabilities.

Gun dog: Gun dogs, also known as bird dogs, are hunting dogs specialized in locating and retrieving game. These canines are trained to assist hunters using firearms and are classified into three categories: pointers and retrievers, setters and spaniels, and water dogs.

Herding dog: A herding dog, also called stock or shepherd dog, is trained or bred to excel in herding. These dogs possess skills and instincts that enable them to control and guide livestock efficiently.

Hound: A hound is a hunting dog bred for tracking and chasing prey. Hunters rely on hounds to pursue and locate their targets.

Livestock guardian dog: A Livestock guardian dog (LGD) is a specialized breed of dog that protects livestock from predators.

Mastiff: A mastiff is a powerful type of dog known for its large size, short coat, and long low-set tail. They have a broad and short muzzle, drooping ears, and big feet. Mastiffs have been used as guard dogs for centuries, protecting homes and property. They have also been used as hunting dogs and war dogs. Historical records show that mastiffs have been involved in blood sports, such as fighting other animals like bulls, bears, and even lions.

Spitz: Spitz: A domestic dog with 68 breeds known for long, thick fur, pointed ears and muzzles. Their tails curl or droop, and smaller breeds resemble foxes while larger ones resemble jackals, coyotes, wolves, and dingoes.

Terrier: Terriers are small, wiry, and fearless dogs bred to hunt vermin. They come in various breeds and sizes, ranging from 1 kg to over 60 kg. Terrier breeds are categorized by size or function and can belong to one of five different groups, each with distinct shapes and sizes.

Arabian horse: The Arabian horse is a distinct breed with roots in the Arabian Peninsula. Known for its unique head shape and high tail carriage, it is one of the oldest horse breeds. Archaeological evidence dates back 3,500 years showing similar horses. Arabian horses have had a global impact through war and trade, improving other breeds with their speed, endurance, and strong bone. Their bloodlines can now be found in almost every modern breed of riding horse.

Andalusian horse: The Andalusian, also known as the Pure Spanish Horse or PRE, is a horse breed from the Iberian Peninsula. It has been recognized as a distinct breed since the 15th century and has maintained its conformation over the centuries. Prized by nobility for its prowess in warfare, it was used in diplomacy and spread throughout Europe. However, herd numbers declined due to warfare, disease, and crossbreeding in the 19th century. While exports were restricted until the 1960s, the breed has since spread worldwide, despite its low population. As of 2010, there were over 185,000 registered Andalusians worldwide.

Friesian horse: The Friesian horse is a breed from the Netherlands, known for its black coat color, long mane and tail, feathering on legs, high head carriage, and high stepping action. Classified as a light draught horse, it almost went extinct multiple times but is now commonly used for riding and driving.

Thoroughbred: The Thoroughbred is a breed of horse known for its agility, speed, and spirit. Developed specifically for horse racing, Thoroughbreds are considered "hot-blooded" horses. Although the term is sometimes used more broadly, it technically refers only to this breed.

Pony: A pony is a small horse with specific conformation and temperament. It may have a thicker coat, mane, tail, shorter legs, wider barrel, heavier bone, thicker neck, and broader head compared to larger horses. The term "pony" originated from the old French word for foal, meaning a young and immature horse.

Mule: A mule is a hybrid animal resulting from the breeding of a male donkey and a female horse. It cannot reproduce due to the different number of chromosomes in the horse and donkey. Mules are more easily obtainable and common compared to another hybrid called a hinny, which is the offspring of a female donkey and a male horse.

Merino: Merino is a group of domestic sheep known for their soft and fine wool. Originating in Spain during the Middle Ages, it was strictly controlled by the Spanish monarchy. In the 18th century, the breed was introduced to various European countries. Over time, Merinos spread to different parts of the world like South Africa, Australia, and New Zealand. Today, the breed has diversified into many recognized types, including American Merino, Australian Merino, and Rambouillet in Europe.

Mammal: Mammals are vertebrate animals with milk-producing mammary glands, a neocortex in the brain, fur or hair, and three middle ear bones. They differ from reptiles and birds and have over 6,400 described species divided into 29 orders. Mammals evolved over 300 million years ago from ancestors in the Carboniferous Period.

Pangolin: Pangolins are scaly anteaters, belonging to the order Pholidota. They are mammals with three genera, Manis, Phataginus, and Smutsia, found in Asia and sub-Saharan Africa. They vary in size, ranging from 30 to 100 cm. In addition to the existing species, there are also several extinct pangolin species. As of September 2023, a total of nine species have been reported.

Proboscidea: Proboscidea is a taxonomic order of Afrotherian mammals that includes the elephants and their close relatives. It consists of one living family (Elephantidae) and various extinct families. Proboscideans are known for being some of the largest land mammals, with the extinct elephant Palaeoloxodon namadicus possibly being the largest ever, estimated to be up to 5.2 m (17.1 ft) tall and weigh up to 22 t. The African bush elephant is the largest living proboscidean, reaching a height of 4 m (13.1 ft) and weighing 10.4 t. Notably, proboscideans have tusks and long, muscular trunks, which were less developed or absent in earlier species.

Elephant: Elephants are the largest land animals, with three species: African bush elephant, African forest elephant, and Asian elephant. They belong to the family Elephantidae and order Proboscidea, and are known for their long trunk, tusks, pillar-like legs, and tough yet sensitive grey skin. The trunk is prehensile and used for feeding and grasping objects, while tusks serve as weapons and tools. Their large ear flaps help regulate body temperature and communicate. African elephants have larger ears and concave backs, whereas Asian elephants have smaller ears and convex or level backs.

Mammoth: Mammoths were extinct elephantids with long, curved tusks that lived from the Pliocene to the Holocene. They had various species present across Africa, Europe, Asia, and North America. Mammoths are closely related to Asian elephants rather than African elephants.

Sirenia: Sirenia, also known as sea cows or sirenians, are fully aquatic, herbivorous mammals that inhabit various water bodies. They belong to the order Sirenia and have two living families, Dugongidae and Trichechidae, with four species in total. They evolved around 50 million years ago in the Eocene and are closely related to elephants and hyraxes. Dugongidae and Trichechidae diverged in the late Eocene or early Oligocene.

Aardvark: The aardvark is a nocturnal, burrowing mammal found in Africa. It is the sole living member of the order Tubulidentata with a distinctive pig-like snout, allowing it to locate food.

Hyrax: Hyraxes, known as dassies, are small, herbivorous mammals resembling pika and marmots. They have fur, short tails, and measure 30-70 cm in length, weighing between 2-5 kg. Surprisingly, hyraxes are closely related to elephants and sea cows.

Bat: Bats, belonging to the Chiroptera order, are the only mammals capable of sustained flight. With adapted forelimbs as wings, they possess agile flight abilities surpassing most birds. Their long digits are covered in a thin membrane, allowing them to achieve flight. The smallest bat is Kitti's hog-nosed bat, measuring 29-34mm in length and weighing 2-2.6g. Conversely, the flying foxes, such as the giant golden-crowned flying fox, can reach a weight of 1.6kg and possess a wingspan of 1.7m.

Megabat: Megabats, also known as fruit bats or flying foxes, belong to the family Pteropodidae in the order Chiroptera. They are the only member of the superfamily Pteropodoidea and are part of the suborder Yinpterochiroptera. There are currently 197 known species of megabats.

Pteropus: Pteropus is a genus of large bats, also known as fruit bats or flying foxes. They reside in South Asia, Southeast Asia, Australia, East Africa, and some islands in the Indian and Pacific Oceans. With over 60 species, Pteropus is recognized as one of the largest bat genera globally.

Microbat: Microbats are a suborder of bats known as Microchiroptera. They are differentiated from Megachiroptera (megabats) based on their size and use of echolocation. Molecular evidence suggests that microbats form a paraphyletic group.

Vampire bat: Vampire bats are leaf-nosed bats found in Central and South America. They have a unique diet of blood, known as hematophagy. There are three existing species: the common, hairy-legged, and white-winged vampire bats. Two extinct species were found in North America.

Carnivora: Carnivora is a major order of mammals known as carnivorans. They are specialized in consuming flesh and make up the fifth largest order, with over 279 species.

Bear: Bears are dog-like carnivores found in North America, South America, and Eurasia. They have large bodies, stocky legs, and long snouts. They also possess shaggy hair, round ears, and plantigrade paws with nonretractile claws. There are eight extant bear species, adapted to a wide range of habitats in the Northern and Southern Hemispheres.

Brown bear: The brown bear is a large bear found in Eurasia and North America. It is one of the largest terrestrial carnivores, second only to the polar bear. Their range spans across several countries, including Russia, China, Canada, United States, Iran, and Europe. In North America, they are called grizzly bears, and the subspecies in Kodiak Islands is known as Kodiak bear.

Giant panda: The giant panda is a bear species endemic to China, recognized for its distinctive black-and-white coat. It mainly eats bamboo, but may also consume grasses, tubers, and occasionally even meat. Although part of the Carnivora order, it is a folivore. Giant pandas in captivity may be fed a variety of foods, including honey, eggs, fish, yams, shrub leaves, oranges, and bananas.

Polar bear: The polar bear is a large bear found in the Arctic and nearby regions. It is closely related to the brown bear. Adult males can weigh 300-800 kg and are the largest carnivores on land. Females are smaller. The polar bear has white- or yellowish-fur, black skin, and a thick layer of fat. It is slimmer than the brown bear, with a narrower skull, longer neck, and lower shoulder hump. Its sharp teeth are adapted for cutting meat. The bear's large paws allow it to walk on ice and swim in water.

Canidae: Canidae is a family of dog-like carnivores known as canids. It consists of three subfamilies: Caninae, Borophaginae (extinct), and Hesperocyoninae. Caninae are called canines and include domestic dogs, wolves, coyotes, foxes, jackals, and other species.

Coyote: The coyote is a smaller species of canine native to North America, similar in size to the eastern wolf and red wolf. It is larger and more predatory than the golden jackal in Eurasia and has been referred to as the American jackal. Historical names for the coyote include the prairie wolf and the brush wolf.

Dog: The dog is a domesticated mammal descended from the wolf. It was the first species to be domesticated over 15,000 years ago by hunter-gatherers in Oberkassel, Bonn. Dogs have a close relationship with humans and have adapted to thrive on a starch-rich diet.

Dingo: The dingo is an ancient dog species found in Australia. Its classification is debated, with various scientific names used. It is considered either a form of domestic dog, a subspecies of dog or wolf, or a distinct species.

Fox: Foxes are medium-sized mammals belonging to the Canidae family. They have flattened skulls, triangular ears, pointed snouts, and long bushy tails. They are omnivorous.

Jackal: Jackals are medium-sized canids found in Africa and Eurasia. "Jackal" typically refers to three species: the black-backed jackal, side-striped jackal, and golden jackal. The African golden wolf was previously classified as a jackal as well.

Wolf: The wolf, also known as the gray wolf, is a large canine native to Eurasia and North America. It is the largest member of the Canidae family and has distinguishable features like less pointed ears, a shorter torso, and a longer tail. Wolves have more than thirty recognized subspecies, including the dog and dingo. Their fur is usually mottled with various colors, but arctic subspecies can be mostly white. Wolves are closely related to smaller Canis species and can produce fertile hybrids with them.

Felidae: Felidae is a family of mammals known as cats. They belong to the order Carnivora. Felidae includes both wild and domestic cats, and they are commonly referred to as felids. The term "cat" can be used to describe all felids as well as specifically the domestic cat.

Cat: The cat, a domesticated species in the Felidae family, originated in the Near East around 7500 BC. It is commonly kept as a house pet or farm cat, but can also live as a feral cat. Valued for companionship and hunting vermin, it has retractable claws and is skilled at killing small prey. With a strong body, quick reflexes, sharp teeth, and enhanced night vision and smell, cats are solitary hunters and active during dusk and dawn. They communicate through various vocalizations and body language, and possess exceptional hearing and the ability to sense pheromones.

Cheetah: The cheetah is a large cat known for its tawny or creamy white fur with solid black spots. It has a small, rounded head with tear-like facial streaks. With a height of 67–94 cm at the shoulder and a length of 1.1–1.5 m, it weighs between 21 and 72 kg. Considered the fastest land animal, it can reach speeds of 93 to 104 km/h. The cheetah has evolved specialized features like a light build, long thin legs, and a long tail that enable it to run at such high speeds.

Cougar: The cougar, also known as the puma or mountain lion, is a large cat native to the Americas. It is the second largest cat after the jaguar and is not considered a "true" big cat due to its smaller size and inability to roar. The cougar's range spans from Canadian provinces to the Western United States and further south into Mexico, the Amazon Rainforest, and the southern Andes Mountains in Patagonia. It is widely distributed across Central and South America, making it the most widely distributed large terrestrial mammal in the Western Hemisphere. The cougar is an adaptable species that can live in various habitats, including dense underbrush and rocky areas.

Lynx: A Lynx is a medium-sized wild cat genus. There are four extant species. The name comes from the Greek word "lynx," referring to its reflective eyes.

Jaguar: The jaguar is a large cat species found in the Americas. It is the largest cat in the Americas and the third largest in the world. With a distinct coat featuring yellow-tan fur and spots that transition to rosettes, it also has a black variant. Jaguars can pierce turtle shells and employ a unique killing method by delivering a fatal bite to the brain.

Leopard: The leopard is a member of the Panthera genus, known for its pale yellowish to dark golden fur with dark spots in rosettes. It has a slender and muscular body, measuring 92-183 cm in length with a 66-102 cm long tail and a shoulder height of 60-70 cm. Males weigh an average of 30.9-72 kg, while females weigh around 20.5-43 kg.

Lion: The lion is a large cat found in Africa and India. It has a powerful build, a round head, round ears, and a hairy tail. Male lions are larger and have a mane. Lions live in groups known as prides, consisting of adult males, related females, and cubs. Females hunt in groups, targeting large animals. Lions are apex predators, but they rarely seek out or prey on humans.

Snow leopard: The snow leopard, also known as the ounce, is a large cat species native to Central and South Asia. With a population of fewer than 10,000 mature individuals, it is listed as Vulnerable on the IUCN Red List. Its main threats come from poaching and habitat destruction due to development. Found in alpine and subalpine zones at elevations of 3,000–4,500 m (9,800–14,800 ft), the snow leopard resides in areas ranging from Afghanistan to Siberia and China.

Tiger: The tiger is the largest living cat species, recognized by its orange fur with dark vertical stripes and a white underside. It is an apex predator that mostly hunts ungulates like deer and wild boar. Tigers are solitary but social predators, requiring large areas of habitat for prey and raising their offspring. Tiger cubs stay with their mother for about two years before becoming independent and establishing their own territory.

Mustelidae: The Mustelidae, or mustelids, are carnivorous mammals that include weasels, badgers, otters, martens, grisons, and wolverines. They form the largest family in the Caniformia suborder of Carnivora, with around 66 to 70 species divided into nine subfamilies.

European badger: The Eurasian badger, also known as the European badger, is a species in the Mustelidae family. It is native to Europe, West Asia, and parts of Central Asia. The European badger has a large, stable population and is classified as least concern on the IUCN Red List. It is the predominant badger species in Europe, often referred to simply as "badger."

Honey badger: The honey badger, known as the ratel, is a mammal found across Africa, Southwest Asia, and the Indian subcontinent. It is considered Least Concern on the IUCN Red List due to its widespread distribution and ability to adapt to various habitats.

Marten: A marten is a weasel-like mammal in the genus Martes that belongs to the family Mustelidae. They have bushy tails, partially retractile claws, and their fur varies from yellowish to dark brown. These slender and agile animals are well adapted to living in the taiga and can be found in coniferous and northern deciduous forests across the Northern Hemisphere. Martens are highly valued for their fur in the animal trapping industry.

Otter: Otters are carnivorous mammals belonging to the subfamily Lutrinae. They are semiaquatic, aquatic, or marine and primarily feed on fish and invertebrates. Lutrinae is a subdivision of the Mustelidae family, which encompasses various animals like weasels, badgers, mink, and wolverines.

Sea otter: The sea otter is a heaviest member of the weasel family found in the North Pacific Ocean. It weighs between 14 and 45 kg and has an extremely dense fur coat for insulation. The sea otter can live solely in the ocean but also walk on land.

Weasel: Weasels are small, active predators with long and slender bodies and short legs. They belong to the genus Mustela, which includes polecats, stoats, ferrets, and European mink. The family Mustelidae is commonly known as the "weasel family". In the UK, the term "weasel" typically refers to the least weasel, the smallest species in the carnivore group.

Stoat: The stoat, also known as the Eurasian ermine, is a mustelid native to Eurasia and parts of North America. It was introduced into New Zealand to control rabbits but had a negative impact on native bird populations. This widely distributed species is listed as Least Concern on the IUCN Red List and has been recognized as one of the world's top 100 "worst invaders."

Wolverine: The Wolverine, also known as the glutton or carcajou, is the biggest land-dwelling species in the Mustelidae family. It is a powerful carnivore that lives alone. Despite its small size, the wolverine is infamous for its incredible ferocity and strength, capable of overpowering prey much larger than itself.

Pinniped: "Pinnipeds, or seals, are a diverse group of carnivorous marine mammals that have adapted to a semi-aquatic lifestyle. They are widely distributed and consist of three extant families, Odobenidae, Otariidae, and Phocidae, with a total of 34 species. Pinnipeds were previously believed to have descended from two different evolutionary lines, but recent molecular evidence suggests they form a single lineage. They belong to the suborder Caniformia of the order Carnivora and share a common ancestry with musteloids, having diverged approximately 50 million years ago."

Eared seal: Eared seals, also known as otariids or otaries, are a family of marine mammals called Otariidae. They consist of 15 species in seven genera, including sea lions and fur seals. Eared seals are different from true seals and walruses. They have adapted to a semi-aquatic lifestyle, spending time in water for feeding and migrating, while breeding and resting on land or ice. They can be found in subpolar, temperate, and equatorial waters across the Pacific and Southern Oceans, as well as the southern Indian and Atlantic Oceans. However, they are absent in the north Atlantic.

Earless seal: Earless seals, also known as phocids or true seals, are a group of mammals within the seal lineage, Pinnipedia. They are distinguished from fur seals and sea lions and belong to the family Phocidae. True seals inhabit the oceans of both hemispheres, predominantly in polar, subpolar, and temperate climates. With the exception of the Baikal seal, which exclusively lives in freshwater, they primarily reside in marine environments.

Walrus: The walrus is a large marine mammal found in the Arctic and subarctic regions. It is the only species in the family Odobenidae and is divided into two subspecies: the Atlantic and Pacific walrus, each living in different oceans.

Procyonidae: Procyonidae is a family of New World carnivores, including raccoons, coatis, and kinkajous. They are omnivorous and inhabit diverse environments.

Hyena: Hyenas are carnivorous mammals belonging to the family Hyaenidae. They are a small family in the Carnivora order and play an essential role in African ecosystems.

Smilodon: Smilodon is an extinct genus of saber-toothed felids that lived in the Americas during the Pleistocene epoch. Often referred to as the saber-toothed tiger, it was not closely related to modern tigers or other cats. The genus was named in 1842 and three species are recognized: S. gracilis, S. fatalis, and S. populator. The largest collection of Smilodon fossils comes from the La Brea Tar Pits in Los Angeles.

Skunk: Skunks are mammals known for their ability to spray a strong-smelling liquid from their anal glands. They belong to the family Mephitidae and come in different appearances, such as black-and-white, brown, cream, or ginger colored. Skunks possess warning coloration.

Mongoose: A mongoose is a small carnivorous mammal that belongs to the family Herpestidae. It is split into two subfamilies, with 23 living species found in southern Europe, Africa, and Asia. The family originated about 21.8 million years ago in the Early Miocene and genetically diverged into two main lineages around 19.1 million years ago.

Hedgehog: A hedgehog is a spiny mammal found in Europe, Asia, Africa, and New Zealand. There are 17 species in 5 genera. They are not native to Australia or the Americas, except for the extinct genus Amphechinus in North America.

Mole (animal): Moles are small mammals that live underground and have cylindrical bodies, velvety fur, small eyes and ears, short hindlimbs, and powerful forelimbs with large digging paws.

Shrew: Shrews are small mole-like mammals in the order Eulipotyphla. They should not be confused with other shrew-like animals, such as treeshrews, otter shrews, and elephant shrews, which belong to different families or orders.

Artiodactyl: Artiodactyls are mammals that belong to the order Artiodactyla. They are typically ungulates that distribute weight evenly on their third and fourth toes. Unlike perissodactyls, they have an even number of toes and often digest plant cellulose in specialized stomach chambers. Recent findings show that cetaceans, like whales and dolphins, are closely related to hippos and fall under this group. Some use the name Cetartiodactyla to include cetaceans, while others keep them separate.

Ruminant: A ruminant is a herbivorous animal that can digest and extract nutrients from plant-based food by fermenting it in a specialized stomach. This process, called foregut fermentation, involves regurgitating and chewing the fermented food again. This rechewing, known as rumination, helps break down plant matter and aids digestion. The term "ruminant" comes from the Latin word "ruminare," meaning "to chew over again."

Bovidae: Bovidae is a family of cloven-hoofed, ruminant mammals that includes various animals like cattle, bison, antelopes, and more. They have 143 living species and 300 known extinct species. The family originated 20 million years ago in the early Miocene and is divided into 11 subfamilies and thirteen tribes. The term 'bovid' refers to a member of this family.

African buffalo: The African buffalo is a large bovine found in sub-Saharan Africa. It has five recognized subspecies, including the Cape buffalo, the largest one found in Southern and East Africa. The smallest subspecies is common in forest areas of Central and West Africa. The African buffalo's distinct feature is its fused horn bases that form a continuous bone shield on top of the head known as a "boss."

Antelope: Antelopes are diverse ruminant animals belonging to the Bovidae family. They are found in Africa, India, the Middle East, Central Asia, and parts of Eastern Europe. While not forming a monophyletic group, antelopes are closely related to bovines, goats, and sheep within the Bovidae family.

Gazelle: A gazelle is a type of antelope, with multiple species in the genera Gazella, Eudorcas, Nanger, and Procapra. Gazelles are found mainly in Africa and Asia.

Impala: The impala is a medium-sized antelope found in eastern and southern Africa. It is the only extant member of the genus Aepyceros. Two subspecies are recognized, the common impala in grasslands and the black-faced impala in scrubland. The impala measures 70-92 cm at the shoulder, weighs 40-76 kg, and has a glossy reddish-brown coat. The male impala has slender, lyre-shaped horns measuring 45-92 cm in length.

Wildebeest: The wildebeest, also known as gnu, is an antelope species native to Eastern and Southern Africa. They belong to the Bovidae family, along with other hoofed mammals like antelopes, cattle, goats, and sheep. There are two species of wildebeest: the black wildebeest or white-tailed gnu, and the blue wildebeest or brindled gnu.

Aurochs: The aurochs is an extinct cattle species, serving as the wild ancestor of modern domestic cattle. It was among the largest herbivores of the Holocene, with males reaching heights of 180 cm (71 in) and females reaching heights of 155 cm (61 in). It possessed long, wide horns that measured around 80 cm (31 in) in length.

Capra(genus): Capra is a mammal genus consisting of ten species, including the markhor and various ibexes. This genus also includes the domestic goat, which has been domesticated for over 8,500 years from the wild goat.

Goat: The goat is a domesticated species of goat-antelope belonging to the Bovidae family. It is closely related to sheep and has over 300 distinct breeds. It was domesticated from the wild goat of Southwest Asia and Eastern Europe and is one of the oldest domesticated animals, with earliest evidence of domestication in Iran around 10,000 years ago.

Cattle: Cattle are domesticated, large ungulates that belong to the subfamily Bovinae. They are widespread and prominent members of the genus Bos. Bulls are mature males, cows are mature females, and young cattle are often colloquially referred to as cows, including heifers, bullocks, and steers.

Gaur: The gaur, an Indian bison native to South and Southeast Asia, is classified as Vulnerable on the IUCN Red List. Its global population of around 21,000 mature individuals is mostly found in India.

Muskox: The muskox, a hoofed mammal of the Bovidae family, is native to the Arctic. It is known for its thick coat and the strong odor emitted by males during mating season. This musky scent helps attract females. In Inuktitut, its name "umingmak" translates to "the bearded one."

Sheep: Sheep are domesticated ruminant mammals commonly kept as livestock. They belong to the order Artiodactyla and are the most numerous species of sheep, with over one billion individuals. In everyday usage, the term sheep usually refers to domesticated sheep, although it can also include other species in the genus Ovis. They have different names depending on their gender and age: adult females are called ewes, intact males are rams or occasionally tups, castrated males are wethers, and young sheep are lambs.

Water buffalo: The water buffalo, also known as the domestic water buffalo or Asian water buffalo, is a large bovid native to the Indian subcontinent and Southeast Asia. It can now be found in several other regions including Italy, the Balkans, Australia, North America, South America, and some African countries. The water buffalo is classified into two main types: the river buffalo, present in India, the Balkans, Egypt, and Italy, and the swamp buffalo, found from Assam to China. These classifications are based on their physical characteristics and behavior.

Yak: The yak is a domesticated long-haired cattle species found in the Himalayan region, Tibetan Plateau, Gilgit-Baltistan, Tajikistan, Mongolia, and Siberia. It is known as the Tartary ox or hairy cattle and is descended from the wild yak.

American bison: The American bison, known as the buffalo, is a native species to North America. It is one of two remaining bison species, with the European bison being the other. Historically, the American bison roamed a vast grassland known as the great bison belt, stretching from Alaska to the Gulf of Mexico and east to the Atlantic Seaboard. Sightings of American bison have been reported as far north as New York and as far south as Florida.

European bison: The European bison, also known as the wisent or zubr, is a species of bison native to Europe. It is the heaviest land animal in Europe and shares its classification with the American bison. During late antiquity and the Middle Ages, the European bison became extinct throughout most of Europe and Asia. Today, it survives only in northern-central Europe and the northern Caucasus Mountains. By the early 20th century, bison were hunted to extinction in the wild.

Alpaca: The alpaca is a smaller species of South American mammal often mistaken for a llama. It can crossbreed with llamas and is believed to have been domesticated from wild relatives. There are two breeds: Suri and Huacaya alpacas.

Guanaco: The guanaco is a South American camelid, closely related to the llama. It is one of two wild camelid species in South America, with the other being the vicuña, found at higher elevations.

Llama: The llama: a domesticated South American camelid, used for meat and as a pack animal by Andean cultures since ancient times.

Vicuña: The vicuña is a wild South American camelid that lives in the Andes. It is closely related to llamas and is believed to be the wild ancestor of domesticated alpacas. Vicuñas produce small amounts of extremely fine wool, which is very expensive. The Inca highly valued their wool and wearing vicuña garments was exclusive to royalty. Today, the vicuña is the national animal of Peru.

Camel: Camels are even-toed ungulates with distinctive fatty humps on their backs. They have been domesticated and are used for food, textiles, and transportation in desert habitats. There are three species of camels: the one-humped dromedary (94% of the population), the two-humped Bactrian camel (6% of the population), and the critically endangered wild Bactrian camel.

Bactrian camel: Bactrian camel, also known as the Mongolian camel, is a two-humped camel native to Central Asia. It has a population of 2 million, mostly in domestication. Named after the historical region of Bactria, it differs from the single-humped dromedary.

Dromedary: The dromedary, also called Arabian camel, is a large even-toed ungulate with a single hump on its back. It belongs to the Camelus genus.

Cetacea: Cetacea is an infraorder of aquatic mammals, including whales, dolphins, and porpoises. They have a fully aquatic lifestyle, streamlined bodies, large size, and carnivorous diet. These animals use their tail with a paddle-like fluke for propulsion and their flipper-shaped forelimbs for maneuvering in water.

Whale: Whales are fully aquatic mammals that belong to the order Cetartiodactyla, along with dolphins and porpoises. They are large members of the infraorder Cetacea, excluding dolphins and porpoises. Whales diverged from hippos around 54 million years ago. There are two groups of whales: baleen whales (Mysticeti) and toothed whales (Odontoceti). Mysticetes consist of four families, while Odontocetes include dolphins, porpoises, and six additional families.

Blue whale: The blue whale is the largest animal ever recorded, measuring up to 29.9 meters (98 ft) and weighing up to 199 tonnes. It is a marine mammal with a long and slender body, varying shades of greyish-blue on top and lighter underneath. It has four recognized subspecies found in different ocean regions. Additionally, there may be a fifth subspecies off the coast of Chile.

Humpback whale: The humpback whale is a large baleen whale known for its unique body shape, long pectoral fins, and tubercles on its head. It is the only species in the Megaptera genus, reaching lengths of 14-17m and weighing up to 40 metric tons. This whale is famous for its breaching and other distinct surface behaviors, making it a favorite for whale watchers. Males of this species produce a complex song lasting anywhere from 4 to 33 minutes.

Dolphin: A dolphin is an aquatic mammal belonging to the infraorder Cetacea. There are 40 extant species of dolphins, categorized into families Delphinidae, Platanistidae, Iniidae, and Pontoporiidae, and possibly extinct Lipotidae.

Orca: The orca, or killer whale, is the largest member of the oceanic dolphin family. It is a toothed whale with a black-and-white patterned body. Orcas are found worldwide, from Arctic to Antarctic regions and tropical seas.

Porpoise: Porpoises are small cetaceans closely related to narwhals and belugas. They are smaller toothed whales and distinct from dolphins due to their flattened, spade-shaped teeth and lack of pronounced beaks. There are eight existing species of porpoise, and they belong to the Cetartiodactyla clade, along with other cetaceans and even-toed ungulates.

Sperm whale: The sperm whale is the largest toothed predator and a member of the toothed whale family. It is the only living species in its genus, Physeter, and one of three current species in the sperm whale family, including the pygmy and dwarf sperm whales.

Deer: Deer, a ruminant mammal, belongs to the Cervidae family. There are two main groups: Cervinae (including elk and red deer) and Capreolinae (including reindeer and white-tailed deer). All male deer and female reindeer grow and shed antlers annually, distinguishing them from permanently horned antelope in a separate family.

Red deer: The red deer is one of the largest deer species, found in Europe, Asia, and Northern Africa. Males are called stags or harts, while females are called hinds. They have been introduced to other regions, including Australia, New Zealand, and the Americas. Red deer are hunted for their venison meat.

Elk: The elk, also known as wapiti, is a large deer species found in North America and Central and East Asia. It is the second largest member of the deer family, Cervidae, and one of the biggest land mammals in its native range. The term "elk" originally referred to a European moose species but was later used for the Cervus canadensis by North American settlers. The name "wapiti" comes from Native American words meaning "white rump," referring to its distinctive light-colored fur on the rear region.

Moose: The moose, also known as the elk, is the tallest land animal in North America and the world's tallest and heaviest deer. It is the only species in the genus Alces. Adult male moose have broad, palmate antlers, distinguishing them from other deer. They inhabit boreal forests and thrive in cooler climates.

Reindeer: The reindeer, or caribou, is a deer species found in regions of Northern Europe, Siberia, and North America. It has a circumpolar distribution and inhabits Arctic, subarctic, tundra, boreal, and mountainous areas. It belongs to the genus Rangifer and recent studies propose identifying six distinct species within this group.

Giraffe: The giraffe is the tallest living terrestrial animal and the largest ruminant on Earth. It belongs to the genus Giraffa and was traditionally believed to be one species with nine subspecies. However, recent research suggests there may be up to eight extant species. The giraffe is an African mammal with both mitochondrial and nuclear DNA variations, as well as distinct morphological measurements. Additionally, seven extinct species of Giraffa are known from fossils.

Sus(genus): Sus is the genus of wild and domestic pigs, including the common Eurasian wild boar and other species. It is part of the Suidae family, which also includes babirusa, pygmy hog, warthogs, and other pig genera from Africa. Sus species are native to Eurasia and Africa, and are closely related to peccaries.

Pig: The pig, also known as swine or hog, is a domesticated mammal that belongs to the genus Sus. It is an omnivore and has a long, pointed head. Adult pigs can weigh between 50 and 350 kg, but some well-fed individuals can exceed this range. They are distinct from other even-toed ungulates because of their omnivorous diet. Pigs make grunting and snorting sounds.

Wild boar: The wild boar, also called the wild swine or wild pig, is a suid found in Eurasia, North Africa, Americas, and Oceania. It is highly adaptable and widespread, making it one of the most common suiform mammals. Despite being an invasive species in some areas, it is assessed as least concern on the IUCN Red List. Wild boars originated in Southeast Asia and outcompeted other suid species as they spread worldwide.

Peccary: A peccary is a pig-like ungulate found in Central and South America, Trinidad, and southwestern North America. They weigh about 20 to 40 kg and measure between 90 and 130 cm in length. Peccaries are the closest relatives of pigs and are part of the suborder Suina within the Artiodactyla order.

Pronghorn: The pronghorn is an artiodactyl mammal found in western and central North America. It is colloquially known as the American antelope and prong buck due to its resemblance to antelopes. Despite not being a true antelope, it fills a similar ecological role. It is the sole surviving member of the Antilocapridae family.

Hippopotamus: The hippopotamus, commonly known as the hippo, is a large semiaquatic mammal found in sub-Saharan Africa. It belongs to the family Hippopotamidae and is one of two extant species, the other being the pygmy hippopotamus. The name "hippopotamus" comes from the ancient Greek meaning "river horse."

Lagomorpha: Lagomorpha is a taxonomic order of mammals consisting of two families: Leporidae (rabbits) and Ochotonidae (pikas). There are 110 recent species, including rabbits, hares, and pikas. The name comes from the Ancient Greek words for hare and shape.

Hare: Hares, belonging to the genus Lepus, are herbivorous mammals found in Africa, Eurasia, and North America. They live solitarily or in pairs and nest in depressions called forms. Hares are skilled runners with powerful hind legs and large ears for regulating body temperature. The genus includes the largest lagomorphs, and their young are independent and self-sufficient shortly after birth. A young hare is known as a "leveret," while a group is called a "husk," "down," or "drove."

Rabbit: Rabbits, or bunnies, are small mammals belonging to the family Leporidae. They are part of the order Lagomorpha. The European rabbit, Oryctolagus cuniculus, is the most well-known and has been introduced worldwide. There are 305 breeds of domestic rabbits derived from it. Sylvilagus includes 13 wild rabbit species, including seven types of cottontail. Rabbits have significant ecological and cultural impacts across the globe. They are commonly used for food, clothing, as companions, and as a source of inspiration in art.

Marsupial: Marsupials are mammals that belong to the infraclass Marsupialia. They are found in Australasia, Wallacea, and the Americas. Most marsupials carry their young in a pouch. Well-known living marsupials include kangaroos, koalas, opossums, Tasmanian devils, wombats, wallabies, and bandicoots. There are also many extinct marsupial species, such as the thylacine, Thylacoleo, and Diprotodon.

Dasyuromorphia: Dasyuromorphia is an order of carnivorous marsupials found mainly in Australia and some in South America. It includes animals like quolls, dunnarts, the numbat, the Tasmanian devil, and the extinct thylacine. Some extinct kangaroos, thylacoleonids, and members of Sparassodonta were also carnivorous. However, exceptions in Australia are the bandicoots and marsupial moles, which are omnivorous.

Tasmanian devil: The Tasmanian devil is a carnivorous marsupial related to the thylacine. Once found in mainland Australia, it is now only found in Tasmania. It has a stocky build, black fur, and emits a strong odor. It is known for its loud screech and powerful bite. It hunts prey and feeds on carrion.

Opossum: Opossums are marsupials endemic to the Americas, comprising 126 species in 18 genera. They originated in South America and migrated to North America during the Great American Interchange.

Peramelemorphia: Peramelemorphia is an order including bandicoots and bilbies, which are native to Australia-New Guinea. These mammals have a distinct bandicoot shape, with a plump, arch-backed body, long snout, large ears, thin legs, and a tail. They range in size from 140 grams to 4 kilograms, with an average weight of about one kilogram.

Diprotodontia: Diprotodontia is the biggest order of marsupials, comprising around 155 species like kangaroos, wallabies, possums, koalas, and wombats. Notable extinct species include the huge Diprotodon and Thylacoleo, known as the "marsupial lion."

Kangaroo: Kangaroos are four marsupials found in Australia and New Guinea. The term commonly refers to the largest species, the red kangaroo, along with the antilopine, eastern grey, and western grey kangaroos. The Australian government estimates a decline in the kangaroo population from 53.2 million in 2013 to 42.8 million in 2019 within commercial harvest areas.

Koala: The koala, also known as the koala bear, is a herbivorous marsupial native to Australia. It is the only living member of the Phascolarctidae family, with wombats as its closest relatives. Koalas are found in coastal areas of eastern and southern Australia, specifically in Queensland, New South Wales, Victoria, and South Australia. They have a stout, tailless body with a large head, round fluffy ears, and a dark nose. Koalas' body length ranges from 60-85 cm and they weigh between 4-15 kg, with fur colors that can vary from silver grey to chocolate brown. Northern koalas tend to be smaller and lighter in color compared to those further south, possibly indicating separate subspecies but this is a matter of debate.

Monotreme: Monotremes are unique mammals that lay eggs instead of giving birth to live young. The platypus and four species of echidnas are the only existing monotremes. They exhibit distinct structural differences in their brain, jaws, digestive tract, reproductive tract, and other body parts compared to other mammals. Despite laying eggs, female monotremes still nurse their offspring with milk.

Echidna: Echidnas, also known as spiny anteaters, are quill-covered monotremes found in Australia and New Guinea. They are the only living mammals that lay eggs and belong to the order Monotremata, alongside the platypus. Echidnas have a diet that includes ants and termites and are not closely related to true anteaters or hedgehogs. Their offspring are called puggles.

Platypus: The platypus is a unique mammal found in Australia. It is semiaquatic, lays eggs, and has a duck-like bill. It is the only surviving member of its family and genus, with some related species in the fossil record.

Perissodactyla: Perissodactyla is an order of ungulates that includes 17 living species divided into three families: Equidae, Rhinocerotidae, and Tapiridae. They typically have three or one weight-bearing toes and may have present, absent, vestigial, or posteriorly positioned nonweight-bearing toes. Unlike artiodactyls, perissodactyls digest plant cellulose in their intestines instead of stomach chambers.

Rhinoceros: A rhinoceros, often called a rhino, is a large odd-toed ungulate belonging to the family Rhinocerotidae. There are five existing species, two found in Africa and three in South and Southeast Asia. The term can also encompass extinct species of the superfamily Rhinocerotoidea.

Tapir: Tapirs are large, herbivorous mammals similar in shape to pigs, with a short, prehensile nose trunk. They can be found in the jungles and forests of South and Central America, as well as Southeast Asia. Tapirs are one of three branches of Perissodactyla, along with equines and rhinoceroses. Only the genus Tapirus currently exists. They migrated from North America to South America through the Isthmus of Panama during the Pleistocene epoch. Tapirs were once present in North America but became extinct in the Late Pleistocene around 12,000 years ago.

Equidae: Equidae is a family of animals that includes horses, asses, and zebras, as well as other fossil species. They evolved from multi-toed ungulates into single-toed animals around 50 million years ago. All existing species belong to the genus Equus, which originated in North America. Equidae is part of the Perissodactyla order, which includes tapirs, rhinoceros, and extinct families.

Donkey: The donkey, a domesticated equine, comes from the African wild ass known as Equus africanus. It can be classified as a subspecies or a separate species. Domestication occurred in Africa around 5000–7000 years ago. Donkeys have been utilized primarily as working animals throughout history.

Horse: The horse is a domesticated mammal belonging to the Equidae family. It has one toe and has evolved over millions of years into the large, single-toed animal we know today. Humans began domesticating horses around 4000 BCE, and by 3000 BCE, it was widespread. While some domesticated horses live in the wild, true wild horses have never been domesticated. The equine world has a specialized vocabulary to describe various aspects of horses, including their anatomy, life stages, size, colors, markings, breeds, locomotion, and behavior.

Zebra: Zebras are African equines known for their black-and-white striped coats. There are three species: Grévy's, plains, and mountain zebras. They share the same genus as horses and asses. The stripes of zebras are unique to each individual and are believed to deter biting flies. Zebras can be found in various habitats across eastern and southern Africa, including savannahs, grasslands, woodlands, shrublands, and mountains.

Primate: Primates are a diverse order of mammals, divided into strepsirrhines (lemurs, galagos, and lorisids) and haplorhines (tarsiers and simians). They arose 85–55 million years ago from small terrestrial mammals, adapting to life in tropical forests. Key primate characteristics include large brains, sharp vision, color perception, flexible shoulder joints, and dexterous hands. They vary greatly in size, from a 30g mouse lemur to a 200kg eastern gorilla. There are currently 376–524 known primate species, with new discoveries continuing into the present day.

Monkey: Monkeys are mammals in the infraorder Simiiformes, commonly referred to as simians. This term traditionally excludes apes, but in the broader sense, apes are also considered monkeys. Therefore, monkeys form an incomplete paraphyletic group, and the terms monkeys and simians are synonymous in their scope.

Ape: Apes are a group of tailless primates found in sub-Saharan Africa and Southeast Asia. They are divided into two main branches: gibbons (lesser apes) and hominids (great apes). Gibbons are highly arboreal and have smaller social groups, while hominids include orangutans, gorillas, bonobos, chimpanzees, and humans. Apes do not have tails due to a mutation in the TBXT gene. The term "ape" can sometimes include certain tailless primates from the Cercopithecidae family as well, but it is not equivalent to the scientific classification of Hominoidea.

Gibbon: Gibbons are apes found in subtropical and tropical rainforests across Southeast Asia. They belong to the family Hylobatidae, which was originally one genus but is now divided into four genera and 20 species. Their habitat stretches from eastern Bangladesh to northeastern India, southern China, and Indonesia.

Gorilla: Gorillas are large herbivorous apes found in equatorial Africa. There are two species, eastern and western gorillas, with several subspecies. They share 95-99% DNA similarity with humans and are closest to us after chimpanzees and bonobos.

Orangutan: Orangutans are large apes found in the rainforests of Indonesia and Malaysia. They currently reside in Borneo and Sumatra, but used to have a wider range in Southeast Asia and South China. Initially believed to be one species, orangutans were later divided into three: Bornean orangutan, Sumatran orangutan, and Tapanuli orangutan. They are the only surviving species in the Ponginae subfamily, which diverged from other hominids over 15 million years ago.

Pan(genus): The Pan genus includes two species: chimpanzees and bonobos, collectively known as panins. They were previously referred to as "chimpanzees" or "chimps" and "pygmy" or "gracile chimpanzees" respectively. Together with humans, gorillas, and orangutans, they belong to the family Hominidae. Chimpanzees and bonobos are native to sub-Saharan Africa, mainly found in the Congo jungle. Chimpanzees can also be found in West Africa. Both species are endangered according to IUCN and chimpanzees have been granted special protection by the Convention on Migratory Species in 2017.

Chimpanzee: The chimpanzee, or chimp, is a great ape found in tropical Africa. It has four confirmed subspecies and is closely related to humans. Chimpanzees have black hair, bare face, hands, and feet. They are larger and heavier than bonobos, their closest relatives. Males weigh 40-70 kg and females weigh 27-50 kg, standing at 150 cm tall.

Bonobo: The bonobo, also known as the pygmy chimpanzee, is an endangered great ape and a distinct species in the genus Pan. Initially thought to be a subspecies of Pan troglodytes, bonobos share physical similarities with chimpanzees. They are part of the chimpanzee/bonobo subtribe Panina, collectively referred to as panins.

Human: Humans, or modern humans, are bipedal primates with large brains and advanced cognitive skills. They thrive and adapt in diverse environments, using complex tools and forming intricate social structures. Humans are highly social, belonging to various cooperating or competing groups, from families to political states. They possess a strong curiosity, driving advancements in science, technology, philosophy, and religion. With more than 8 billion currently alive, humans are the most widespread and common species.

New World monkey: New World monkeys are primates found in tropical regions of Mexico, Central and South America. They belong to five families: Callitrichidae, Cebidae, Aotidae, Pitheciidae, and Atelidae. These families are ranked together as Ceboidea, the only remaining superfamily in the parvorder Platyrrhini.

Capuchin monkey: The capuchin monkey is a New World monkey found in Central and South America. They are known as the "organ grinder" monkey and have appeared in movies and TV shows. Capuchin monkeys reside in tropical forests in countries like Costa Rica and Panama. In Central America, they are called white-faced monkeys and inhabit wet lowland and deciduous dry forests.

Spider monkey: Spider monkeys, belonging to the genus Ateles, are New World monkeys found in tropical forests of Central and South America. The genus has seven species, all facing threats, especially the critically endangered brown spider monkey. They are known for being easily bred in captivity.

Old World monkey: Old World monkeys, in the Cercopithecidae family, are the largest primate family with 24 genera and 138 recognized species. They include baboons, macaques, and red colobus among others. Other Old World monkeys are known by names like talapoin, guenon, vervet, and mandrill.

Baboon: Baboons are a type of primate in the Papio genus, belonging to the Old World monkeys. There are six different species, including the hamadryas, Guinea, olive, yellow, Kinda, and chacma baboons, each found in specific areas of Africa and the Arabian Peninsula. These baboons have been around for over two million years and are among the largest non-hominoid primates.

Macaque: The term 'Macaque' refers to a genus of gregarious Old World monkeys called Macaca. There are 23 species of macaques distributed across Asia, North Africa, and Europe. They primarily eat fruits and also consume seeds, leaves, flowers, and tree bark. Some species occasionally include small amounts of meat in their diet. Macaques are known to be social animals, with dominant matriarchs leading their social groups.

Rhesus macaque: The rhesus macaque, also known as the rhesus monkey, is a type of Old World monkey. It comes in different colors and sizes, with various subspecies found in China and India. This versatile primate can be found across South, Central, and Southeast Asia, adapting to diverse climates and habitats. Feral populations have also been established in the United States.

Strepsirrhini: Strepsirrhini, a suborder of primates, includes lemurs, galagos, pottos, and lorises. It also encompasses extinct adapiform primates, known as "lemur-like" creatures. Strepsirrhini originated in Africa, with some species spreading to Asia and North America. As the climate cooled, adapiforms disappeared from the Northern Hemisphere.

Galago: Galagos, also known as bush babies or nagapies, are small nocturnal primates found in sub-Saharan Africa. They belong to the Galagidae family and are closely related to the Lorisidae family.

Lemur: Lemurs are primates found only on the island of Madagascar. They belong to the superfamily Lemuroidea, comprising 15 genera and around 100 existing species. With small size, a pointed snout, large eyes, and a long tail, lemurs predominantly inhabit trees and are nocturnal creatures.

Slow loris: The Slow loris is a group of primates found in Southeast Asia known as Nycticebus. They range from Bangladesh to Java and from Yunnan province to the Sulu Archipelago. There are at least eight species: Sunda, Bengal, Javan, Philippine, Bangka, Bornean, Kayan River, and Sumatran slow lorises. The pygmy slow loris is now classified under a different genus. They are closely related to slender lorises, pottos, false pottos, and angwantibos, and distantly related to lemurs. Limited fossil record and inconsistent molecular clock studies make their evolutionary history uncertain.

Tarsier: Tarsiers are primates found in Southeast Asia. They belong to the family Tarsiidae and are the only extant family within the infraorder Tarsiiformes. Originally widespread, they are now only found in Brunei, Indonesia, Malaysia, and the Philippines.

Rodent: Rodents, members of the order Rodentia, are mammals with continuously growing incisors in their upper and lower jaws. They make up about 40% of all mammal species and are found on all major land masses, except New Zealand, Antarctica, and some oceanic islands. Humans have introduced rodents to most of these areas.

Capybara: The capybara is a giant rodent from South America, known as the largest living rodent. It is closely related to guinea pigs and rock cavies. It inhabits savannas and dense forests near water bodies. Capybaras are highly social animals, often found in groups of up to 100 individuals. They are hunted for their meat, hide, and grease from their thick fatty skin.

Nutria: The nutria, also known as the coypu, is a large semi-aquatic rodent from South America. Originally native to South America, it has been introduced to North America, Europe, Asia, and Africa. Nutria live in burrows near water and feed on river plant stems. They are considered an invasive species due to their destructive burrowing and feeding habits, often conflicting with humans. Nutria also transmit diseases through water contamination, posing risks to humans and animals.

Beaver: Beavers are large, semi-aquatic rodents found in the Northern Hemisphere. They are the second-largest living rodents, weighing up to 50 kg. Beavers have stout bodies, long incisors, brown or gray fur, and flat, scaly tails. They differ in skull and tail shape and fur color between the North American and Eurasian species. Beavers inhabit freshwater habitats like rivers, lakes, and ponds, and are herbivorous, feeding on tree bark, aquatic plants, grasses, and sedges.

Dormouse: The dormouse is a nocturnal rodent found in Africa, Asia, and Europe. It belongs to the Gliridae family and is known for its extended hibernation period lasting six months or more.

Guinea pig: The guinea pig, also known as the cavy, is a domesticated rodent native to the Andes region of South America. Despite its name, it is not related to pigs nor is it from Guinea. The animal is commonly used in scientific and laboratory settings, while breeders refer to it as the "cavy." Guinea pigs are believed to be domesticated descendants of a closely related cavy species. Originally bred for meat, they are still consumed in some regions.

Hamster: Hamsters are rodent pets that belong to the subfamily Cricetinae, including 19 species in seven genera. The golden hamster, also known as the Syrian hamster, is the most popular pet species. Other common pet species include three types of dwarf hamsters: Campbell's, Winter White, and Roborovski.

Muridae: The Muridae, or murids, are the largest family of rodents and mammals with around 1,383 species. They include various mice, rats, and gerbils that are native to Eurasia, Africa, and Australia.

Rat: Rats are medium-sized rodents with long tails. They belong to the Rattus genus, although other rat genera include Neotoma, Bandicota, and Dipodomys.

Brown rat: The brown rat, also called the common rat, is a widespread species of rodent. It is one of the largest muroids, measuring up to 28 cm in length with a slightly shorter tail. Weighing between 140 and 500 g, it is brown or grey in color. Originally from northern China, it has now spread to all continents except Antarctica and is prominent in Europe and North America. The brown rat is commonly found wherever humans reside, especially in urban areas.

Mouse: A mouse is a small rodent with a pointed snout, rounded ears, a scaly tail, and a high breeding rate. The common house mouse is the most famous species. Mice are often kept as pets and can invade homes for food and shelter.

Muskrat: The muskrat is a rodent native to North America, but also found in parts of Europe, Asia, and South America. It is a semiaquatic species commonly found in wetlands. This medium-sized animal plays a significant role in wetland ecology and serves as a valuable food and fur resource for humans.

Porcupine: Porcupines are large rodents with sharp spines that protect them from predators. They belong to two different families: the Old World porcupines and the New World porcupines. Both families have similar coats made of rigid or semi-rigid quills. Despite the similarities, the two groups are distinct and not closely related within the rodent order. Porcupines are the third-largest living rodents and have the largest species among them.

Squirrel: Squirrels are small to medium-sized rodents that belong to the family Sciuridae. They come in different types such as tree squirrels, ground squirrels, and flying squirrels. Indigenous to the Americas, Eurasia, and Africa, squirrels were brought to Australia by humans. Fossil evidence shows their existence since the Eocene epoch. Squirrels are closely related to the mountain beaver and dormice within the larger group of living rodents.

Marmot: Marmots are large ground squirrels found in Asia, Europe, and North America. They are herbivores, active in summer and hibernate in winter. Marmots are the heaviest members of the squirrel family.

Anteater: Anteaters are mammal species known for eating ants and termites. They are part of the suborder Vermilingua and are closely related to sloths within the order Pilosa. The term "anteater" is often mistakenly used for unrelated animals such as aardvarks, numbat, echidnas, and pangolins.

Armadillo: The armadillo is a New World placental mammal in the order Cingulata, part of the superorder Xenarthra. There are 21 extant species of armadillo, native to the Americas, with different armor bands. They inhabit various environments in the Americas.

Sloth: Sloths are slow-moving Neotropical mammals that live in the trees of South and Central American rainforests. They consist of arboreal tree sloths and extinct ground sloths. Known for hanging upside down, tree sloths spend their lives in the treetops. They are closely related to anteaters and belong to the xenarthran order Pilosa.

Bird: Birds are warm-blooded vertebrates with feathers, toothless beaked jaws, and the ability to lay hard-shelled eggs. They have a high metabolic rate, a four-chambered heart, and a lightweight yet strong skeleton. Birds can be found worldwide, varying in size from the tiny bee hummingbird to the large common ostrich. There are over 11,000 living species, with more than half being perching birds. Wings, developed from forelimbs, enable most birds to fly, although flight is lost in certain species. Digestive and respiratory systems of birds are adapted for flight, and some species have further adapted for swimming in aquatic environments. The study of birds is known as ornithology.

Bird of prey: Birds of prey, also known as raptors, are hypercarnivorous birds that actively hunt and feed on other vertebrates. They possess strong speed, strength, keen eyesight, sharp talons, and powerful beaks for hunting and tearing flesh. While primarily hunting live prey, they also scavenge and consume carrion.

Palaeognathae: Palaeognathae is an infraclass of birds, also known as paleognaths, which are part of the Archosauria clade in the Aves class. It is one of the two existing infraclasses of birds, alongside Neognathae, together forming Neornithes. Palaeognathae consists of five flightless lineages called ratites, such as the kiwis, cassowaries, emus, rheas, and ostriches, as well as one flying lineage known as the Neotropic tinamous. There are 47 species of tinamous, five of kiwis, three of cassowaries, one of emus, two of rheas, and two of ostriches. Recent studies indicate that paleognaths are monophyletic, and the traditional distinction between flightless and flighted forms is incorrect, as flightlessness developed independently multiple times through parallel evolution within the ratite group, which includes tinamous.

Seabird: Seabirds are marine-adapted birds that show convergent evolution due to similar adaptations to environmental challenges and feeding niches. They first evolved in the Cretaceous period, and modern seabird families emerged in the Paleogene.

Flamingo: Flamingos are wading birds in the family Phoenicopteridae. They belong to the only extant family in the order Phoenicopteriformes. There are four species in the Americas and two species in Afro-Eurasia.

Loon: Loons, also known as divers, are aquatic birds found in North America and northern Eurasia. They belong to the Gavia genus in the Gaviidae family and Gaviiformes order.

Accipiter: Accipiter is a diverse genus of birds of prey in the Accipitridae family, with 49 recognized species. Most species are called goshawks or sparrowhawks, while New World species are known as hawks. They lack a procoracoid foramen, which distinguishes them from other birds in their family. There are two small species, with a large procoracoid foramen, that may be separated in the old genus Hieraspiza based on DNA sequence.

Eagle: The term "Eagle" refers to various birds of prey in the Accipitridae family, including the golden and bald eagles. True eagles are part of the Aquila genus. Out of the 68 eagle species, most are found in Eurasia and Africa. The rest are distributed across North and South America, as well as Australia.

Golden eagle: The golden eagle is a highly distributed bird of prey found in the Northern Hemisphere. It belongs to the family Accipitridae and is well-known for its dark brown plumage and golden-brown nape. With their agility and powerful talons, they hunt various prey including hares, rabbits, and ground squirrels. These eagles have large territories and build nests in high places to breed. They are monogamous, laying up to four eggs and incubating them for six weeks. Juvenile eagles become independent after three months and establish their own territory in around four to five years.

Falcon: Falcons are a diverse group of birds of prey found worldwide, excluding Antarctica. They belong to the genus Falco and encompass approximately 40 species. While closely related raptors were present in Antarctica during the Eocene, true falcons did not inhabit the continent.

Peregrine falcon: The peregrine falcon, also known as the peregrine, is a large bird of prey. It has a blue-grey back, white underparts, and a black head. It is famous for its incredible speed, being able to reach over 320 km/h during hunting. The fastest recorded speed of a peregrine falcon is 389 km/h. Females are significantly larger than males.

New World vulture: New World vultures, also known as condors, are a family of birds of prey found in the Americas. There are seven extant species in five genera, including five vultures and two condors. They are distinct from Old World vultures and have similar appearance and behavior due to convergent evolution. They inhabit warm and temperate areas.

Old World vulture: Old World vultures are found in Europe, Asia, and Africa. They belong to the family Accipitridae, which includes eagles, buzzards, kites, and hawks.

Osprey: The osprey, also known as sea hawk and fish hawk, is a large bird of prey that feeds on fish. It has a wide range of habitats and is diurnal. With a length of over 60 cm and a wingspan of 180 cm, it has brown upperparts and a greyish head and underparts.

Secretarybird: The Secretarybird is a large bird of prey found in Africa. It inhabits open grasslands and savannas. It was described by John Frederick Miller in 1779 and belongs to the Accipitriformes order. It is placed in its own family called Sagittariidae.

Duck: Ducks are waterfowl in the Anatidae family, smaller than swans and geese. They are not a monophyletic group, distinct from swans and geese. Ducks are mostly aquatic birds and can be found in both fresh and sea water.

Mallard: The mallard is a dabbling duck found across temperate and subtropical regions. It has been introduced to several countries. Belonging to the Anatinae subfamily of waterfowl, males have green heads and females have brown-speckled plumage. Both have a speculum on their wings. The mallard is around 50-65 cm long, with a wingspan of 81-98 cm and a bill length of 4.4 to 6.1 cm. It is slightly heavier than other dabbling ducks, weighing 0.7-1.6 kg. Mallards live in wetlands, eat water plants and small animals, and prefer to gather in groups or flocks.

Goose: A goose is a waterbird belonging to the Anatidae family, specifically the genera Anser and Branta. It is related to swans and ducks, with swans being larger and ducks being smaller. Some other bird species, like shelducks, also have "goose" in their names.

Swan: Swans are birds in the family Anatidae, closely related to geese and ducks. They belong to the genus Cygnus and are often grouped with geese in the subfamily Anserinae, forming the tribe Cygnini. Some consider swans as a distinct subfamily called Cygninae.

Hummingbird: Hummingbirds are small birds in the biological family Trochilidae, native to the Americas. They comprise about 366 species and 113 genera, with a wide distribution from Alaska to Tierra del Fuego. Most species are found in Central and South America. Unfortunately, around 28 species are endangered or critically endangered, and many others are experiencing population decline.

Swift (bird): Swifts, belonging to the family Apodidae, are speedy aerial birds. While they resemble swallows, they are not closely related to any passerine species. Found in the order Apodiformes with hummingbirds, true swifts are distinct from the closely related treeswifts, which form a separate family known as Hemiprocnidae.

Auk: An auk is a bird in the Alcidae family of Charadriiformes order, including murres, guillemots, auklets, puffins, and murrelets. There are 25 existing or recently extinct species categorized into 11 genera.

Gull: Gulls, also known as seagulls, are seabirds in the Laridae family. They are closely related to terns and skimmers, but distantly related to auks and waders. Most gulls were classified under the Larus genus until recently, when multiple new genera were recognized. In some regional dialects, gulls are referred to as mews, which is similar to their names in German, Danish, Swedish, Dutch, Norwegian, and French.

Tern: Terns are slender seabirds found worldwide near bodies of water. They belong to the Laridae family and share similarities with gulls and skimmers. With their long, forked tails, narrow wings, long bills, and short legs, these birds are lightly built. Most species have pale grey and white plumage with a black cap on their heads, although some have dark plumage temporarily. While males and females look the same, young terns differ from adults. During non-breeding periods, terns often display a white forehead and a reduced black cap.

Sandpiper: The Sandpiper is a type of shorebird, part of the Scolopacidae family, which includes other species like curlews and snipes. Sandpipers mainly feed on small invertebrates found in mud or soil. Their bills vary in length, allowing different species to coexist in the same habitat without competing for food, particularly along the coast.

Heron: Heron is a family of long-legged, long-necked birds found in freshwater and coastal areas. There are 72 recognized species, some of which are called egrets or bitterns. Egrets are mainly white or have decorative plumes in breeding plumage. Herons have long beaks. Bitterns are referred to as members of the Botaurus and Ixobrychus genera, along with the zigzag heron in the Zebrilus genus.

Ibis: Ibis are long-legged wading birds found in wetlands, forests, and plains. The term "Ibis" originates from Latin and Ancient Greek. The western cattle egret was misidentified in 1757 as a sacred ibis.

Shoebill: The shoebill, also called the whalebill or whale-headed stork, is a large wading bird in East Africa. It is named after its distinctive shoe-shaped bill. With a stork-like appearance, it was originally classified with storks but is now grouped with pelicans and herons based on genetic evidence. The adult is mainly grey, while juveniles have a brown coloration. It inhabits large swamps in tropical East Africa, from South Sudan to Zambia.

Stork: Storks are large wading birds with long legs, necks, and stout bills. They belong to the Ciconiidae family and the Ciconiiformes order, which previously included herons and ibises. Other families have since been moved to different orders.

Columbidae: Columbidae is a bird family including doves and pigeons. They have stout bodies, short necks, and slender bills. Some species have fleshy ceres. They feed on plants, with some species eating seeds on the ground, while others feed on fruits from branches. Columbidae is the only family in the Columbiformes order. They are found globally, with the highest diversity in the Indomalayan and Australasian regions, often living in close proximity to humans.

Dodo: The dodo was a flightless bird endemic to Mauritius in the Indian Ocean. It is now extinct and was closely related to the Rodrigues solitaire. Both birds belonged to the Raphinae subfamily, which included other extinct flightless birds and is part of the pigeon and dove family. The Nicobar pigeon is the closest living relative. Claims of a white dodo on Réunion were likely based on confusion with the extinct Réunion ibis and depictions of white dodos in paintings.

Passenger pigeon: The passenger pigeon, an extinct species of pigeon, was native to North America. Its name reflects its migratory nature. The mourning dove was often mistaken as its relative, but genetic analysis revealed a closer relationship with the Patagioenas genus.

Rock dove: The rock dove, also known as the rock pigeon or common pigeon, is a member of the Columbidae bird family. It is commonly referred to as the "pigeon", although the domesticated form is more familiar to people. The wild rock dove is the original form of this bird.

River kingfisher: River kingfishers, also known as pygmy kingfishers, are a subfamily of kingfishers found in Africa, Asia, and Australia. They include species that dive for fish, with their origin believed to be in Asia. The common kingfisher is the only species found in Europe and northern Asia.

Hornbill: Hornbills are colorful birds found in Africa, Asia, and Melanesia. They have a distinctive long, downward-curved bill with a sometimes horn-like structure on top. These birds have a unique kidney structure and fused neck vertebrae. They are omnivorous, eating fruits and small animals. Hornbills are monogamous and nest in tree cavities or cliffs. Unfortunately, some hornbill species are endangered, particularly in Southeast Asia.

Hoopoe: The Hoopoe is a colorful bird with a distinctive feathered "crown." It can be found in Africa, Asia, and Europe. There are three living species and one extinct species recognized. Some experts consider all three living species to be the same. The Eurasian hoopoe is abundant and not threatened, but its population is declining in Western Europe. However, its numbers are increasing in the South Sinai region.

Cuckoo: Cuckoos, found in the Cuculidae family of birds, belong to the order Cuculiformes. They include various species like the common cuckoo, roadrunners, koels, malkohas, couas, coucals, and anis. Sometimes, the coucals and anis are classified as separate families. The Cuculiformes order is part of a larger group called Otidimorphae, along with turacos and bustards. With 150 species divided into 33 genera, the Cuculidae family is diverse.

Hoatzin: The Hoatzin is a unique tropical bird found in swamps and forests of South America. It is the only bird in the Opisthocomidae family, under the Opisthocomiformes order. Its taxonomic position remains debated among specialists.

Turaco: Turaco refers to the bird family Musophagidae, also known as "banana-eaters", comprising of plantain-eaters and go-away-birds. In southern Africa, turacos and go-away-birds are commonly called loeries. They have semi-zygodactylous feet, with a flexible fourth toe. Some species have conjoined second and third toes. Musophagids often possess prominent crests and long tails, while turacos are famous for their vivid green and red feathers, thanks to unique pigments.

Galliformes: Galliformes is an order of ground-feeding birds including turkeys, chickens, quail, and others. Known as gallinaceous birds, they play vital roles as seed dispersers and predators in ecosystems. Humans rear them for meat and eggs, while they are also hunted for sport.

Grouse: Grouse are birds in the family Phasianidae, order Galliformes. They belong to the tribe Tetraonini, supported by mitochondrial DNA studies, and are recognized by various ornithological groups.

Guineafowl: Guineafowl are African birds in the Galliformes order, known for their ancient lineage. They evolved after the Cracidae but before the Odontophoridae. A fossil lineage called Telecrex, found in Mongolia, is associated with guineafowl and may have given rise to blood pheasants and eared pheasants. These birds adapted to high-altitude and montane environments with the emergence of the Tibetan Plateau. While most guineafowl species are found only in Africa, the helmeted guineafowl has been introduced and domesticated in various locations.

Peafowl: Peafowl refers to two bird species, Pavo and Afropavo, in the family Phasianidae. Males are called peacocks, females are called peahens, but both are commonly referred to as "peacocks."

Chicken: Chickens are a domesticated species descended from red junglefowl in Southeast Asia. They hybridize with other junglefowl species. Adult males are called roosters or cocks, while younger males are cockerels and castrated males are capons. Adult females are hens and immature females are pullets. Humans keep chickens for food or as pets. They were historically bred for cockfighting and are still used in some areas. Chickens bred for meat are broilers, while those bred for eggs are layers.

Domestic turkey: The domestic turkey is a large fowl, closely related to the wild turkey. It was thought to have been domesticated in central Mesoamerica around 2,000 years ago, with a possible second domestication event in the southwestern United States between 200 BC and 500 AD. All modern domestic turkey varieties can be traced back to the turkeys raised in central Mexico and later brought to Europe by the Spanish in the 16th century.

Common pheasant: The common pheasant is a bird in the pheasant family, known scientifically as Phasianus colchicus. It gets its genus name, Phasianus, from the Latin word for "pheasant". The species name, colchicus, refers to the country Colchis, where pheasants were first discovered by Europeans. Recent studies have found that the common pheasant is not closely related to junglefowl and domesticated chickens, even though they were previously thought to be. They diverged from each other more than 20 million years ago.

Common quail: The common quail is a small migratory game bird found in the western Palearctic. It belongs to the pheasant family, Phasianidae, and nests on the ground. During winter, it migrates to Africa and southern India.

Gruiformes: Gruiformes is an order of birds, including both living and extinct families, characterized by their crane-like appearance. They exhibit a wide geographic distribution.

Crane (bird): Cranes are large birds in the Gruidae family, with long legs and necks. They have 15 species divided among four genera: Antigone, Balearica, Leucogeranus, and Grus. Most cranes have grey or white plumage with black and red patches on the face. However, the Balearica genus exhibits vibrant-colored wings and golden "crowns." Unlike other birds, cranes fly with their necks extended outward and legs stretched out.

Bustard: Bustards are large birds found in dry grasslands and steppes of the Old World. They belong to the family Otididae and range from 40 to 150 cm in length. They include floricans and korhaans.

Rail (bird): Rails are small to medium-sized birds found worldwide, occupying diverse habitats including wetlands, marshes, and forests. They come in various forms and comprise species like crakes, coots, and gallinules. While some rail species are common, others are extremely rare or endangered. Rails are associated with dense vegetation and are known to nest in marshes, rice paddies, and flooded fields. They can be found in all terrestrial habitats except for dry deserts, polar regions, freezing areas, and alpine regions. Rallidae species are present on every continent except Antarctica, and there are numerous unique rail species on different islands.

Passerine: Passerines, also known as perching birds, make up more than half of all bird species. They belong to the order Passeriformes and have an anisodactyl arrangement of their toes, allowing them to perch easily.

Songbird: A songbird, also known as Oscines, is a type of bird belonging to the Passeri suborder of perching birds. They are found worldwide and are known for their complex and diverse bird songs, thanks to their well-developed vocal organs. The Passeriformes group, which includes around 5,000 species, is where songbirds belong.

Bird-of-paradise: The bird-of-paradise is a family of birds known for their colorful plumage and elaborate feathers. They are found in eastern Indonesia, Papua New Guinea, and eastern Australia. There are 45 species in 17 genera. Males have long feathers on the beak, wings, tail, or head, and exhibit sexual dimorphism. They live in dense rainforests and primarily eat fruit and arthropods. Breeding systems vary from monogamy to polygamy.

Corvidae: The Corvidae family is a diverse group of birds including crows, ravens, magpies, and jays. They are commonly known as the crow family or corvids. There are 135 species in this family, with the genus Corvus alone comprising over a third of the entire family. Ravens, which are corvids, are the largest passerine birds.

Corvus: Corvus is a genus of birds in the family Corvidae, including crows, ravens, and rooks. The species commonly found in Europe are carrion crows, hooded crows, common ravens, and rooks. The name "crow" or "raven" is based on their size, with crows generally being smaller. The genus name, Corvus, is derived from the Latin word for "raven."

Common raven: The common raven is a large all-black bird found across the Northern Hemisphere. It is widely distributed and has at least eight subspecies with little variation in appearance. Recent research has revealed significant genetic differences among regional populations. This raven is one of the largest corvids and possibly the heaviest passerine bird. It measures around 63 cm in length and weighs about 1.47 kg. While their typical lifespan is shorter, common ravens can live over 23 years in the wild. They travel in flocks when young but mate for life, defending a territory as a mated pair.

Eurasian magpie: The Eurasian magpie, a member of the crow family, is a resident breeding bird in the northern part of Eurasia. It is part of the "monochrome" magpie group and is often referred to as simply "magpie" in Europe. Unlike the Australian Magpie, the Eurasian magpie is not closely related and is the only magpie found in Europe, aside from the Iberian magpie in the Iberian Peninsula.

Honeyeater: The honeyeaters are a diverse family of small to medium-sized birds, known as Meliphagidae. They are most commonly found in Australia and New Guinea, but can also be found in New Zealand, the Pacific islands and Wallacea. Some notable species include Australian chats, myzomelas, friarbirds, wattlebirds, miners and melidectes. Honeyeaters are known for their wide distribution and are represented by a single species in Bali, situated across the Wallace Line.

Lyrebird: The lyrebird is a ground-dwelling Australian bird known for its ability to mimic sounds from its surroundings. It belongs to the genus Menura and the family Menuridae. The male lyrebird displays a spectacular fanned-out tail during courtship. They have distinct neutral-colored tail feathers and are iconic native birds of Australia.

Shrike: Shrikes are passerine birds in the Laniidae family, consisting of 34 species across two genera.

Bulbul: Bulbuls are medium-sized passerine songbirds that belong to the family Pycnonotidae. They are found in various habitats across Africa, the Middle East, Asia, and some tropical islands. The family includes greenbuls, brownbuls, leafloves, and bristlebills, with a total of 166 species in 32 genera. African bulbuls are commonly found in rainforests, while Asian bulbuls prefer open areas. They have a diverse distribution and are known for their melodious songs.

Bunting (bird): Buntings, comprising the Emberiza genus, are a group of Old World passerine birds. They are the sole genus in the Emberizidae family, consisting of 45 species. These seed-eating birds have short, cone-shaped bills.

Cardinalidae: The Cardinalidae is a family of New World passerine birds, including cardinals, grosbeaks, and buntings. It also comprises other genera like Piranga and Granatellus. Membership is determined more by molecular work than physical traits. These songbirds vary in size, with stout features and some species having large bills.

Finch: Finches are small to medium-sized birds in the family Fringillidae. They have stout conical bills for eating seeds and nuts and often display colorful plumage. These resident birds are found in various habitats worldwide, except for Australia and the polar regions. The family Fringillidae consists of over 200 species in 50 genera, including canaries, siskins, redpolls, serins, grosbeaks, euphonias, and Hawaiian honeycreepers.

Icterid: Icterids, also known as New World blackbirds, are a family of small to medium-sized, colorful birds found in the Americas. With 108 species in 30 genera, they showcase a wide range of sizes, shapes, behaviors, and colors. Most icterids have black plumage with vibrant accents of yellow, orange, or red. The name originates from the Greek ikteros, meaning "jaundiced ones," and includes New World blackbirds, orioles, bobolinks, meadowlarks, grackles, cowbirds, oropendolas, and caciques.

Lark: Larks are passerine birds found worldwide, with the highest species diversity in Africa. They are known for their ability to live in diverse habitats, including dry regions. The Eurasian skylark is a commonly referred to species when using the term "lark".

Mockingbird: Mockingbirds are New World passerine birds known for mimicking the songs of other birds and sounds of insects and amphibians. They belong to the family Mimidae, consisting of about 17 species in two genera. Some mockingbird species were previously placed in a separate genus called Nesomimus. Interestingly, the mockingbirds do not form a monophyletic lineage, as Melanotis is more closely related to catbirds, while Mimus appears to be closer to thrashers like the sage thrasher.

New World warbler: The New World warblers, or wood-warblers, are a family of small, colorful birds found exclusively in the New World. They belong to the family Parulidae and consist of 120 species. Unlike Old World and Australian warblers, they are not closely related. Most of them live in trees, but some, like the ovenbird and waterthrushes, prefer terrestrial habitats. These birds are mainly insectivores.

Old World flycatcher: Old World flycatchers are small passerine birds that are primarily found in the Old World, with a few exceptions. They are mainly insectivores and catch their prey while flying. The Muscicapidae family consists of 351 species divided into 54 genera.

European robin: The European robin is a small passerine bird belonging to the chat subfamily. It is found across Europe, Western Siberia, and North Africa. In Great Britain and Ireland, it is commonly known as the robin or robin redbreast. The bird is insectivorous and mostly sedentary, except in the far north.

Common nightingale: The common nightingale, also known as the rufous nightingale or nightingale, is a small bird famous for its beautiful and strong song. It was previously classified as a thrush, but is now considered an Old World flycatcher. This species is part of a group of mainly terrestrial birds often called chats.

Old World sparrow: Old World sparrows, also known as true sparrows, are small passerine birds in the family Passeridae. They are distinct from New World sparrows and other similar birds. Many species inhabit cities and nest on buildings, with Eurasian tree sparrows being particularly common. These sparrows primarily eat seeds but also consume small insects. Some species scavenge for food in urban areas and have a varied diet.

House sparrow: The house sparrow is a small bird found worldwide, with males having distinctive black, white, and brown markings. It belongs to the sparrow family Passeridae and is one of about 25 species in the genus Passer. Native to Europe, the Mediterranean Basin, and Asia, it has been introduced to many other regions, making it the most widely distributed wild bird.

Ploceidae: Ploceidae is a family of small passerine birds known as weavers, weaverbirds, weaver finches, or bishops. They build intricately woven nests using vegetation. This family originated in the mid-Miocene and consists of birds native to the Old World, mostly in Africa. Some species have been introduced to other regions.

Starling: Starlings are small to medium-sized passerine birds from the family Sturnidae. They have 128 species divided into 36 genera. Asian species are called mynas, while African species are known as glossy starlings due to their shiny feathers. Starlings are native to Europe, Asia, Africa, northern Australia, and the Pacific islands, but have been introduced to North America, Hawaii, and New Zealand, where they are considered invasive. The most familiar species in Europe and North America is the common starling, while the common myna is prevalent in Asia and the Pacific.

Common myna: The common myna, also known as the Indian myna, is an adaptable bird found in Asia. It belongs to the Sturnidae family and is known for its omnivorous diet. With a strong territorial instinct, it thrives in urban environments as well as open woodlands.

Common starling: The common starling, known as the European starling in North America and the starling in Great Britain and Ireland, is a medium-sized bird with glossy black plumage and a metallic sheen. It is about 20 cm long, has pink legs and a black bill in winter (yellow in summer), and young birds have browner feathers. It is noisy and has a varied song. The common starling is known for its gift of mimicry, mentioned in literature such as the Mabinogion, Pliny the Elder's works, and William Shakespeare's writings.

Sunbird: Sunbirds and spiderhunters are small, colorful passerine birds from the Old World. They have downward-curved bills and many males display vibrant, iridescent feathers. Some species have long tail feathers. They are found in Africa, the Middle East, Asia, and Australia, with the highest diversity in equatorial regions.

Swallow: Swallows are passerine songbirds found worldwide, known for their aerial feeding skills and distinctive appearance. There are around 90 species divided into 19 genera, with the highest diversity in Africa. They are colloquially called "swallow" in Europe, mainly referring to the barn swallow. They can be found on all continents, including Antarctica, and some oceanic islands. While European and North American species migrate long distances, those in West and South Africa are nonmigratory. Swallows are believed to have evolved as hole-nesters in Africa.

Tit (bird): Tits are small passerine birds found mainly in the Northern Hemisphere and Africa. They belong to the family Paridae, which also includes chickadees and titmice. Previously, most of them were classified under the genus Parus.

Thrush (bird): Thrushes are small to medium-sized ground living birds found worldwide. They belong to the passerine bird family Turdidae. They feed on insects, other invertebrates, and fruit. The family was once larger, but biologists reclassified some species as Old World flycatchers. Some unrelated species are named after thrushes due to their resemblance to this bird family.

American robin: The American robin, a migratory bird, is part of the true thrush genus and Turdidae family. It is named after the European robin but is not closely related to it. Known for its reddish-orange breast, the American robin is widespread throughout North America, wintering from southern Canada to central Mexico and along the Pacific coast.

Wren: Wrens are a family of brown passerine birds found mainly in the Americas. There are 88 species divided into 19 genera. The Eurasian wren is the only one occurring in the Old World, where it is commonly called "wren". The name has also been used for unrelated birds in New Zealand and Australia.

Antbird: Antbirds are a diverse family of passerine birds found in Central and South America. With over 230 species, they are known by various names such as antshrikes, antwrens, and fire-eyes. They are not related to wrens, vireos, or shrikes but are closely related to other bird families like antthrushes and tapaculos.

Ovenbird (family): Ovenbirds, belonging to the family Furnariidae, are small suboscine passerine birds found across Mexico and Central to southern South America. With about 315 species and 70 genera, they make up a large family. However, the ovenbird itself, found in North America, is not a furnariid but instead a distantly related member of the wood warbler family, Parulidae.

Tyrant flycatcher: Tyrant flycatchers are a diverse family of passerine birds found in North and South America. With over 400 species, they are the largest bird family in the world. These birds vary in shape, size, and color, with some resembling Old World flycatchers. While they belong to the suborder Tyranni, they do not possess advanced vocal abilities like most songbirds.

Cormorant: Cormorants are a family of about 40 aquatic bird species known as cormorants and shags. The International Ornithologists' Union has established a consensus taxonomy of seven genera within this family. In Britain and Ireland, the great cormorant and the common shag are the only commonly encountered species. The terms "cormorant" and "shag" have been given to other species in the family somewhat randomly.

Darter: Darters, also known as anhingas or snakebirds, are tropical waterbirds in the Anhingidae family. They have a long, snake-like neck and impale fish with their thin beak. There are four species, with one classified as near-threatened. The American darter, also called anhinga or "water turkey," is a common species with a long tail, often hunted for food.

Frigatebird: Frigatebirds are seabirds found in tropical oceans. They have black feathers, long forked tails, and hooked bills. Males have a red pouch they inflate to attract mates. With wingspans up to 2.3 meters, they have the largest wing area to body weight ratio among birds.

Pelican: Pelicans are large water birds with long beaks and throat pouches for catching prey and draining water. They have pale plumage, except for brown and Peruvian pelicans. Before breeding, their bills, pouches, and facial skin become brightly colored.

Sulidae: The Sulidae family consists of gannets and boobies, known as sulids. They are medium-large coastal seabirds that dive for fish and similar prey. Initially, older sources considered all 10 species to be in the same genus, Sula. However, distinctive characteristics in morphology, behavior, and DNA sequences differentiate the gannets (Morus) from the true boobies (Sula). Abbott's booby (Papasula) is a unique lineage that stands apart from both and may be closer to the gannets than to the true boobies.

Honeyguide: Honeyguides are birds in the order Piciformes with a tropical distribution. They are known as indicator birds or honey birds. They primarily reside in Africa and Asia. Honeyguides have a unique interaction with humans as they guide them to bee colonies, allowing themselves to feast on the grubs and beeswax left behind.

Toucan: Toucans are colorful birds in the Ramphastidae family, closely related to American barbets. They are known for their large bills and bright markings. With over 40 species, they belong to five different genera.

Woodpecker: Woodpeckers are birds found worldwide, except in certain regions. They reside in forests, woodlands, deserts, and rocky hillsides. They are part of the Picidae family, which also includes piculets, wrynecks, and sapsuckers. The Gila woodpecker is known for its unique ability to exploit cacti as a food source.

Procellariiformes: Procellariiformes is an order of seabirds consisting of albatrosses, petrels, shearwaters, and storm petrels. They are often referred to as petrels, except for the albatrosses. These seabirds are mainly found in the open ocean and have a global distribution, with a higher diversity in the vicinity of New Zealand.

Albatross: Albatrosses are large seabirds found in the Southern Ocean and North Pacific. They are related to other seabirds in the order Procellariiformes. Albatrosses have long wingspans, with some species reaching up to 3.7 m (12 ft). They are typically grouped into four genera, but the exact number of species is debated. Albatrosses used to occur in the North Atlantic but are now absent, although occasional strays can be found.

Procellariidae: Procellariidae is a family of seabirds including petrels, prions, and shearwaters. They are part of the Procellariiformes order, which also includes albatrosses and storm petrels.

Cockatoo: A cockatoo is a type of parrot belonging to the family Cacatuidae. They are part of the order Psittaciformes and are mainly found in Australasian regions including the Philippines, Indonesia, New Guinea, Solomon Islands, and Australia. There are 21 different species of cockatoos, making up the only family in the superfamily Cacatuoidea.

Parrot: Parrots, also known as psittacines, are tropical and subtropical birds with a strong curved beak, upright stance, and clawed feet. They belong to four families: Psittaculidae, Psittacidae, Cacatuoidea, and Strigopidae. There are about 410 species in 101 genera, with one-third at risk of extinction, making parrots one of the most endangered bird groups. They have a wide distribution, including temperate regions, but are most diverse in South America and Australasia.

Budgerigar: The budgerigar, also known as the common parakeet, is a small, long-tailed parrot that primarily eats seeds. It is the only species in the Melopsittacus genus. Wild budgies are green and yellow with black markings. Captive-bred budgies come in various colors and even have small crests. Juveniles and chicks look similar, but adults can be distinguished by their cere coloring and behavior.

Ara(bird): The Ara genus of macaws includes eight living species and two extinct species. Coined by Bernard Germain de Lacépède in 1799, Ara is part of the Arini tribe and derives its name from the Tupi word for the sound macaws make.

Cassowary: Cassowaries are flightless, ratite birds found in tropical forests of New Guinea, the Aru Islands, and northeastern Australia. They belong to the genus Casuarius and the order Casuariiformes.

Emu: The emu is the largest native bird of Australia and the second-tallest in the world after the ostrich. It is the only surviving member of the genus Dromaius and is endemic to Australia. Its range covers most of the mainland, and subspecies on Tasmania, Kangaroo Island, and King Island went extinct after European settlement in 1788.

Kiwi (bird): Kiwi are flightless birds found only in New Zealand. They belong to the order Apterygiformes, family Apterygidae, and genus Apteryx. Kiwi are the smallest ratites, about the size of a domestic chicken.

Moa: Moa were flightless birds that lived in New Zealand, but became extinct during the Late Pleistocene-Holocene. There were nine species, with the largest reaching 3.6 meters in height and weighing 230 kilograms. The smallest species was similar in size to a turkey. The moa population at the time of Polynesian settlement is estimated to have been between 58,000 and 2.5 million.

Common ostrich: The common ostrich, a flightless bird found in Africa, is one of two surviving species of ostriches. It belongs to the ratite order of birds and is the only member of the Struthio genus. The Somali ostrich is the other species, recently recognized as distinct by BirdLife International.

Rhea (bird): The Rhea, also called ñandu or South American ostrich, is a moderately-sized bird found in South America. It belongs to the order Rheiformes and is closely related to the emu and African ostriches. Rheas are slightly smaller than emus and share similar characteristics.

Tinamou: The Tinamou is a bird species belonging to the Tinamiformes order. It is part of the Tinamidae family, with 46 species found in Mexico, Central America, and South America. They are ground-dwelling birds that prefer hiding or running rather than flying when faced with danger. Tinamous can be found in various habitats, from alpine grasslands to rainforests. The two subfamilies, Nothurinae and Tinaminae, are distinguished by their habitats: steppe/open country and forest, respectively.

Penguin: Penguins are aquatic flightless birds that are highly adapted for life in the ocean. They have dark and white plumage to blend with their surroundings, along with flippers for swimming. Found mostly in the Southern Hemisphere, penguins feed on krill, fish, and squid, catching their prey with their bills and swallowing whole while swimming. They also possess a spiny tongue and strong jaws to grip slippery prey.

Owl: Owls are nocturnal birds of prey with over 200 species. They have an upright stance, a broad head, and sharp talons. Owls are known for their binocular vision, binaural hearing, and feathers adapted for silent flight. Some exceptions to their solitary nature are the diurnal northern hawk-owl and the gregarious burrowing owl.

Eurasian eagle-owl: The Eurasian eagle-owl, also known as Uhu, is a large owl species found in Eurasia. It is one of the biggest owls, with females reaching a length of 75 cm and a wingspan of 188 cm. Their upper parts are mottled with darker blackish and tawny coloration, while the underparts are buff and streaked. The owl has distinctive ear tufts and orange eyes. It is occasionally referred to as just the eagle-owl in Europe.

Barn owl: The barn owl, or common barn owl, is a widespread species of owl found almost everywhere in the world except for polar and desert regions, Asia north of the Himalayas, some Indonesian islands, and some Pacific Islands. It is a member of the Tytonidae family, forming one of the two main lineages of living owls.

Trogon: The trogons and quetzals are birds in the order Trogoniformes, with 46 species in one family. These birds have existed for 49 million years and are believed to be closely related to mousebirds and owls. The name "trogon" comes from Greek and refers to their habit of gnawing holes in trees to make nests.

Resplendent quetzal: The resplendent quetzal is a small bird found in southern Mexico and Central America, specifically in tropical forests. They are a part of the Trogonidae family and have two recognized subspecies. These birds primarily eat fruits from the laurel family but also target insects, lizards, frogs, and snails.

Archaeopteryx: Archaeopteryx, also known as "Urvogel," is a genus of avian dinosaurs. Its name combines the Greek words for "ancient" and "feather" or "wing." For a long time, it was considered the oldest-known bird. However, newer findings have identified older potential avialans such as Anchiornis, Xiaotingia, and Aurornis.

Reptile: Reptiles are tetrapods with cold-blooded metabolism and amniotic development. They include turtles, crocodilians, squamates, and rhynchocephalians. The Reptile Database lists around 12,000 living species. The study of reptiles, along with amphibians, is known as herpetology.

Crocodilia: Crocodilia is an order of mostly large, predatory, semiaquatic reptiles known as crocodilians. They first appeared 94 million years ago in the Late Cretaceous period and are the closest living relatives of birds. Members of the order's total group, the clade Pseudosuchia, appeared about 250 million years ago in the Early Triassic period. The order includes true crocodiles, alligators, caimans, gharials, and false gharials. Crocodilians are the only known survivors of the Archosauria.

Alligator: Alligators, also known as gators, are large reptiles in the Crocodilia order. They belong to the genus Alligator and the family Alligatoridae. The two surviving species are the American alligator and the Chinese alligator. Alligators have been present since the Oligocene epoch, around 37 million years ago.

Caiman: Caimans are small crocodilian reptiles found in Mexico and Central & South America. They have scaly skin and lead a nocturnal lifestyle. The black caiman is the largest species, growing over 4 meters long and weighing more than 1,000 kg. The Cuvier's dwarf caiman is the smallest species, reaching lengths of 1.2 to 1.5 meters. There are six different caiman species in total, and they primarily inhabit marshes, swamps, mangrove rivers, and lakes in the region.

Crocodile: Crocodiles are large reptiles found in tropical regions worldwide and are part of the Crocodilia order, which also includes alligators, caimans, and gharials.

Lizard: Lizards are squamate reptiles found worldwide, excluding Antarctica, and comprise over 7,000 species. Some lizards are closer related to snakes than to other lizards. They vary in size from a few centimeters to the massive Komodo dragon.

Gecko: Geckos are carnivorous lizards, found worldwide in warm climates, except Antarctica. Belonging to the Gekkota infraorder, they vary in size from 1.6 to 60 centimeters.

Gila monster: The Gila monster is a venomous lizard found in the Southwestern United States and northwestern Mexico. It is a slow-moving reptile, measuring up to 56 centimeters long. They are the only venomous lizards native to the United States, while their close relatives, four beaded lizards, are found in Mexico and Guatemala. Although not generally dangerous or a threat to humans, they have a fearsome reputation and are sometimes killed, despite being protected by state law in Arizona.

Komodo dragon: The Komodo dragon is an enormous reptile from the monitor lizard family Varanidae found only in Indonesia. It is the biggest living lizard, reaching up to 3 m (9.8 ft) in length and weighing around 70 kg (150 lb).

Skink: Skinks are a diverse family of lizards, with over 1,500 species in 100 genera. They have smaller legs than typical lizards and inhabit various habitats, excluding arctic and subarctic regions.

Chameleon: Chameleons are a unique group of Old World lizards, with around 200 known species. They are famous for their ability to change colors, ranging from different hues to brightness. While some chameleons primarily change brightness, others display a wide variety of color combinations.

Green iguana: The green iguana, a large lizard belonging to the Iguana genus, is also known as the American iguana. It is primarily arboreal and mostly herbivorous. Found in a wide geographic area from southern Brazil to Mexico, it is commonly referred to as the iguana.

Horned lizard: The horned lizard, also known as the horned lizard, horny toad, or horntoad, is a type of North American lizard. They have horns on their heads, flattened bodies, rounded shapes, and blunt snouts. The horned lizard is part of the Phrynosomatidae family.

Tuatara: Tuatara are unique reptiles found only in New Zealand. They belong to the order Rhynchocephalia, distinguishing them from lizards. The term "tuatara" originates from the Māori language, meaning "peaks on the back."

Snake: Snakes are limbless, carnivorous reptiles with elongated bodies covered in scales. They are ectothermic and have skulls with additional joints, allowing them to swallow prey larger than their heads. Snakes have paired organs appearing one in front of the other and typically possess only one functional lung. Some species still retain vestigial claws and a pelvic girdle. Although legless lizards resemble snakes, they have eyelids and external ears, unlike snakes.

Boidae: The Boidae, also known as boas, are a family of nonvenomous snakes found in Americas, Africa, Europe, and Asia. They include some of the world's largest snakes, such as the South American green anaconda. Boas generally range from medium to large in size, with females typically larger. There are currently 15 genera and 54 species recognized within the family.

Garter snake: The Garter snake is a small to medium-sized snake found in North and Central America. It belongs to the genus Thamnophis in the Colubridae family. These snakes are native to all of the lower 48 United States and most of the Canadian provinces, except for Newfoundland and Labrador. They can be found from west-central Canada to the subarctic plains, as well as from the Maritime Provinces to Florida and across the southern and central United States. Garter snakes also inhabit the arid regions of the southwest, Mexico, Guatemala, and the neotropics, including Costa Rica.

Naja: Naja is a widespread genus of venomous snakes known as cobras. They are recognized as the true cobras and can be found in Africa, Southwest Asia, South Asia, and Southeast Asia. Other snakes like the king cobra and rinkhals are commonly called cobras, but they belong to different genera.

Coral snake: Coral snakes are a diverse group of elapid snakes separated into two main categories: Old World coral snakes and New World coral snakes. The Old World group consists of 16 species in three genera, while the New World group includes over 65 recognized species in two genera. Studies suggest that the oldest lineages originated in Asia. Venomous, New World species rarely cause death, with only two confirmed fatalities in the past century. The genus Micruroides has never caused a medically significant bite.

Mamba: Mambas are highly venomous snakes native to sub-Saharan Africa. There are four recognized species, with three being arboreal and green, and one terrestrial and brown or grey. The black mamba is particularly feared across its range. These snakes are known for their speed and have numerous legends and stories associated with them in Africa.

Sea snake: Sea snakes, also known as coral reef snakes, are elapid snakes that live in marine environments. They are divided into two subfamilies, Hydrophiinae and Laticaudinae. Hydrophiinae includes both marine and terrestrial snakes found in Australasia, while Laticaudinae includes only the sea kraits. There are 69 species of sea snakes in total, belonging to seven different genera.

Agkistrodon piscivorus: The Agkistrodon piscivorus is a venomous snake found in the Southeastern United States. It is a large semi-aquatic viper known for its painful and potentially fatal bite. When threatened, it coils its body, displays its fangs, and may bite. It prefers to inhabit or stay near water, including slow-moving lakes, streams, and marshes. This snake is an adept swimmer and can occasionally be found swimming between barrier islands and the mainland.

Eastern copperhead: The eastern copperhead, or simply copperhead, is a venomous snake native to eastern North America. It belongs to the subfamily Crotalinae within the Viperidae family.

Rattlesnake: Rattlesnakes are venomous vipers that reside in diverse habitats, capturing small animals like birds and rodents.

Adder: Vipera berus, also called common European adder, is a venomous snake found all across Europe and East Asia. It belongs to the Viperidae family and has three known subspecies.

Turtle: Turtles are reptiles with a unique shell formed mainly from their ribs. They can be split into two groups, Pleurodira and Cryptodira, depending on how their heads retract. With about 360 species, including tortoises and terrapins, they inhabit various continents, islands, and oceans. Turtles, like other amniotes, breathe air and typically do not lay eggs underwater, although they often live near water.

Alligator snapping turtle: The Alligator Snapping Turtle is a large and heavy freshwater turtle native to the United States. It is the biggest freshwater turtle in North America and one of the heaviest globally. Although it shares some similarities with the common snapping turtle, they are not closely related. The species name temminckii honors the Dutch zoologist Coenraad Jacob Temminck.

Box turtle: Box turtles are a group of turtle species found in Asia and North America. They have a dome-shaped shell that can be closed tightly for protection. Asian box turtles belong to the Cuora or Pyxidea genus, while North American box turtles belong to the Terrapene genus. These two genera differ in habitat, behavior, and appearance, and are not classified in the same family. Box turtles are popular pets, but their captive care requires complexity, and capturing them can harm wild populations.

Common snapping turtle: The common snapping turtle is a large freshwater turtle found in the Americas. It has a wide range that extends from Canada to Florida. It is one of the few remaining species in its family, Chelydridae. The common snapping turtle is known for its widespread distribution.

Painted turtle: The painted turtle is a widespread native turtle in North America, found from Canada to Mexico and from the Atlantic to the Pacific. It prefers wetlands with long inundation periods and has adapted to withstand freezing temperatures. Belonging to the Chrysemys genus in the Emydidae family, fossils indicate its existence 15 million years ago. Some consider the southern painted turtle as a separate species or subspecies.

Red-eared slider: The red-eared slider is a popular pet turtle known for its invasive nature. It is a semiaquatic turtle belonging to the family Emydidae and is the most commonly traded turtle globally.

Sea turtle: Sea turtles, also known as marine turtles, are reptiles found in oceans. There are seven species: flatback, green, hawksbill, leatherback, loggerhead, Kemp's ridley, and olive ridley. Six of these species are found in U.S. waters and are endangered or threatened. Globally, all species except flatback are considered threatened on the IUCN Red List. Flatback turtles are exclusive to Australia, Papua New Guinea, and Indonesia.

Tortoise: Tortoises are reptiles (Testudinidae) with a protective shell to avoid predation. They have a hard shell, retracting their necks and heads into it for protection.

Galápagos tortoise: The Galápagos tortoise is the largest species of tortoise, with some weighing up to 417 kg. It belongs to the genus Chelonoidis and consists of 15 subspecies. These tortoises are the largest living tortoises and terrestrial ectotherms.

Dinosaur: Dinosaurs are a reptile group that appeared over 200 million years ago and became the main land-dwelling animals after a major extinction event. Birds are considered feathered dinosaurs, evolving from theropods in the Late Jurassic. This makes birds the only surviving dinosaur lineage, while all other dinosaurs are now extinct.

Triceratops: Triceratops is a late Cretaceous dinosaur from western North America, known for its three horns and the frill on its head. It lived until the Cretaceous-Paleogene extinction event, about 66 million years ago. The name Triceratops originates from Greek words meaning 'three-horned face'.

Iguanodon: Iguanodon is a genus of dinosaur that lived during the Late Jurassic and Early Cretaceous periods. It is primarily based on one well-established species called I. bernissartensis. These large herbivores measured around 9-11 meters in length and weighed about 4.5 metric tons. They had distinctive thumb spikes for defense and long, grasping fifth fingers for foraging. The fossils of Iguanodon have been found in Belgium, Germany, England, and Spain, dating back 126-122 million years ago.

Stegosaurus: Stegosaurus is an herbivorous armored dinosaur from the Late Jurassic. It had distinctive upright plates on its back and spikes on its tail. Its fossils have been found in the western United States and Portugal, dating back 155 to 145 million years. Three species are universally recognized. Over 80 individual animals of this genus have been discovered. Stegosaurus coexisted with dinosaurs like Apatosaurus, Diplodocus, Camarasaurus, and may have been preyed upon by Allosaurus.

Apatosaurus: Apatosaurus is a herbivorous dinosaur that lived in North America during the Late Jurassic period. It was first described in 1877 and named A. ajax, with a second species, A. louisae, named in 1916. Apatosaurus fossils are found in Colorado, Oklahoma, New Mexico, Wyoming, and Utah. They measured about 21-23 meters in length and weighed around 16.4-22.4 tons on average. Some specimens were even larger, reaching a length 11-30% greater than average and weighing around 33 tons.

Diplodocus: Diplodocus was a dinosaur genus, a type of sauropod with long necks and tails. Its fossils were discovered in 1877 and the name comes from the Greek words for "double" and "beam," referring to unique double-beamed chevron bones found in its tail.

Allosaurus: Allosaurus is a large carnosaurian theropod dinosaur that lived during the Late Jurassic period. Its unique concave vertebrae gave it the name "different lizard" in Greek. Described in 1877 by Othniel Charles Marsh, Allosaurus is one of the first well-known theropod dinosaurs in history.

Velociraptor: Velociraptor was a small dinosaur genus that lived in Asia during the Late Cretaceous period, around 75 to 71 million years ago. It is known for two recognized species, V. mongoliensis and V. osmolskae. The first species was described in 1924 and its fossils were found in Mongolia's Djadochta Formation. The second species, named in 2008, was identified from skull material in China's Bayan Mandahu Formation.

Tyrannosaurus: The Tyrannosaurus is a large theropod dinosaur that lived in what is now western North America. The most well-known species is Tyrannosaurus rex or T. rex, which is one of the most complete and studied theropods. It had a wide range and lived on an island continent called Laramidia. Fossils of Tyrannosaurus have been found in various rock formations from the Upper Cretaceous period, around 72.7 to 66 million years ago. It was one of the last non-avian dinosaurs before the Cretaceous-Paleogene extinction event.

Pterosaur: Pterosaurs were ancient flying reptiles that lived from the Late Triassic to the end of the Cretaceous period. They were the first vertebrates to evolve powered flight and had wings made of a skin membrane stretching from their ankles to an elongated fourth finger.

Plesiosaur: Plesiosaurs were ancient marine reptiles that lived during the Mesozoic era. They belong to the Sauropterygia group and are now extinct.

Synapsid: Synapsids are a major group of vertebrate animals in the Amniota group, dominating the land during the late Paleozoic and early Mesozoic eras. Unlike other amniotes, they have a single temporal fenestra, an opening low in the skull behind each eye orbit. Synapsids diverged from sauropsids about 318 million years ago, and mammals are the only surviving group in the Cenozoic era.

Dimetrodon: Dimetrodon is a non-mammalian synapsid that lived around 295-272 million years ago. It had a large sail on its back formed by elongated spines and measured 1.7-4.6 m long, weighing 28-250 kg. It had a tall, curved skull with large teeth of different sizes. Fossils have been found in the Southwestern United States, primarily in the Red Beds of Texas and Oklahoma, but also in Germany. Over a dozen species have been named since its discovery in 1878.

Amphibian: Amphibians are a class of vertebrate animals that are ectothermic and have four limbs. They are a diverse group, excluding amniotes, and are mostly found in freshwater, wetland, or terrestrial habitats. They belong to the subclass Lissamphibia, consisting of three orders: frogs, salamanders, and caecilians. Amphibians undergo a life cycle that starts as aquatic larvae called tadpoles, although some species have adapted to skip this stage.

Caecilian: Caecilians are limbless, worm-shaped or snake-shaped amphibians found in the tropics of South and Central America, Africa, and southern Asia. Living hidden in soil or streambeds, caecilians are cryptic and among the least known amphibians. They have small or absent eyes and feed on subterranean creatures. Their cylindrical bodies are often darkly colored, with a bullet-shaped and strong skull. Caecilian heads have unique adaptations like fused cranial and jaw bones, a two-part jaw muscle system, and a chemosensory tentacle. Their slimy skin bears ringlike markings or grooves and may contain scales.

Frog: A frog is a short-bodied, tailless amphibian that belongs to the order Anura. They are carnivorous and widely distributed, with the highest species diversity found in tropical rainforests. Frogs make up 88% of all amphibian species and are one of the top five diverse vertebrate groups. The distinction between frogs and toads is not based on taxonomy or evolutionary history, but is informal.

Hylidae: 'Hylidae' is a family of frogs known as "tree frogs and their allies". Despite their name, hylids encompass various frog species that inhabit not only trees but also terrestrial and semiaquatic environments.

Leptodactylidae: The Leptodactylidae are a diverse family of frogs that likely appeared during the Cretaceous period. They are known as "southern frogs," deriving their name from Greek, meaning slender-toed animals. The family consists of 206 species, divided into 13 genera, predominantly found in Mexico, the Caribbean, Central, and South America. This group includes frogs with various lifestyles, such as terrestrial, burrowing, aquatic, and arboreal, adapting to a wide range of habitats. Notably, taxonomic revisions have resulted in the Eleutherodactylinae subfamily being classified as its own family, called Eleutherodactylidae.

True toad: A true toad is a member of the Bufonidae family in the order Anura. It is the only family where all members are referred to as toads, although some may be called frogs. There are over 35 genera of bufonids, with Bufo being the most famous.

True frog: The true frogs (Ranidae) are a widespread family of frogs, found on all continents except Antarctica. They have the widest global distribution of any frog family, occurring in North and South America, Europe, Africa, and Asia. One species, the Australian wood frog, has even reached the far north of Australia.

American bullfrog: The American bullfrog, also known simply as the bullfrog, is a sizable frog native to eastern North America. It prefers living in large bodies of water like swamps and lakes, but can also adapt to manmade habitats. The male bullfrog is named for its deep bellowing sound during breeding season. It is a large frog and is commonly consumed, particularly in the southern United States where it is abundant.

Salamander: Salamanders are amphibians with lizard-like bodies, slender shapes, blunt snouts, and tails in both larvae and adults. They belong to the order Urodela in the group Caudata, with ten families. They are most diverse in eastern North America, particularly in the Appalachian Mountains, and are also found in the Holarctic and Neotropical realms.

Newt: A newt is a semiaquatic salamander that goes through three life stages: aquatic larva, terrestrial juvenile (eft), and adult. They are found in North America, Europe, North Africa, and Asia. Adult newts have lizard-like bodies and breed in water annually, while living in moist land habitats.

Fish: A fish is an aquatic animal with gills, lacking limbs with digits. This includes various species such as hagfish, lampreys, cartilaginous and bony fish, as well as extinct related groups. Most fish species (95%) are ray-finned and belong to the class Actinopterygii, with teleosts accounting for the majority (99%) of these.

Chondrichthyes: Chondrichthyes, or cartilaginous fish, are a class of jawed fish with skeletons made mostly of cartilage. They differ from bony fish by lacking bones as their main skeletal component. These aquatic vertebrates have paired fins, paired nares, placoid scales, a conus arteriosus in the heart, and do not possess an opecula or swim bladders. Cartilaginous fish are unique among jawed vertebrates within the infraphylum Gnathostomata.

Osteichthyes: Osteichthyes, known as bony fish, are vertebrate animals with skeletons primarily made of bone. They differ from Chondrichthyes, which have cartilage skeletons. Osteichthyes is a highly diverse group with over 28,000 species, making it the largest class of vertebrates today.

Actinopterygii: Actinopterygii, also known as ray-finned fish, is a bony fish class that makes up more than half of all vertebrate species. Their fins are made of webbing supported by thin bony spines called lepidotrichia, different from the fleshy lobed fins of other fish. These fan-like fins have the ability to change shape and wetted area, providing better movement efficiency. The fin rays are directly attached to the skeletal elements, called radials, which connect the fins to the internal skeleton.

Sarcopterygii: Sarcopterygii, also known as lobe-finned fish or sarcopterygians, have muscular limb buds (lobes) within their fins, supported by articulated appendicular skeletons. They are distinct from the other group of bony fish, Actinopterygii, which have fins supported by skin-covered bony spines.

Coelacanth: Coelacanths are an ancient group of lobe-finned fish in the class Actinistia. They are closely related to lungfish and tetrapods, rather than ray-finned fish.

Lungfish: Lungfish are unique freshwater vertebrates with the ability to breathe air and retain ancestral traits within Osteichthyes and Sarcopterygii. They are the closest living relatives of tetrapods and have tooth plates in their mouths to crush hard shelled organisms.

Batoidea: Batoidea is a superorder of rays, a type of cartilaginous fish. They belong to the subclass Elasmobranchii along with their close relatives, the sharks. With over 600 species in 26 families, rays are the largest group of cartilaginous fishes. Their key features include flattened bodies, pectoral fins fused to the head, and gill slits located on their underside.

Manta ray: Manta rays are large rays in the genus Mobula, with M. birostris reaching 7 m (23 ft) wide and M. alfredi reaching 5.5 m (18 ft) wide. They have triangular pectoral fins, horn-shaped cephalic fins, and forward-facing mouths. Manta rays, classified among Myliobatiformes in the family Myliobatidae, possess the largest brains and brain to body ratio among fish and can pass the mirror test.

Electric ray: Electric rays are cartilaginous fish with enlarged pectoral fins. They belong to the order Torpediniformes and have the ability to produce an electric discharge. This discharge can range from 8 to 220 volts and is used for stunning prey and self-defense. There are a total of 69 species of electric rays, spread across four families.

Sawfish: Sawfish, also called carpenter sharks, are large rays with a distinct long, narrow nose lined with sharp, saw-like teeth. They can grow up to 7-7.6 m (23-25 ft) in length. Found globally in tropical and subtropical areas, they inhabit various water bodies including seas, estuaries, and freshwater rivers. Sadly, all sawfish species are currently endangered.

Skate (fish): Skate (fish) are cartilaginous fish in the Rajidae family of the Batoidea superorder. They include more than 150 described species across 17 genera. Formerly considered subfamilies, softnose and pygmy skates are now recognized as distinct families. The term "skate" can also extend to the entire Rajiformes order.

Stingray: Stingrays are cartilaginous fish related to sharks. They belong to the suborder Myliobatoidei and consist of eight families. There are approximately 220 known stingray species categorized into 29 genera.

Chimaera: Chimaeras, or ghost sharks, are cartilaginous fish (Chimaeriformes) also called rat fish, spookfish, or rabbit fish. They should not be confused with other species named rattails, Opisthoproctidae, or Siganidae.

Shark: Sharks are elasmobranch fish with a cartilaginous skeleton, gill slits on the head, and separate pectoral fins. They belong to the Selachimorpha group and are closely related to the Batoidea. Extinct Chondrichthyes with shark-like traits are sometimes included. Shark-like species appeared in the Devonian Period, while confirmed modern sharks date back to the Early Jurassic, about 200 million years ago. True shark records might go back even further.

Nurse shark: The nurse shark is a type of fish in the Ginglymostomatidae family. It is globally assessed as Vulnerable and near threatened in the western Atlantic Ocean due to threats in South America, Central America, and the Caribbean. It is targeted in certain fisheries and considered by-catch in others.

Whale shark: The whale shark is the largest known fish and a filter-feeding shark. It can reach lengths of up to 18.8 m (61.7 ft) and is the most massive non-mammalian animal in the world. It is the only member of its genus and family, belonging to a subclass of cartilaginous fish called Elasmobranchii. Previously classified differently, the whale shark now holds its own scientific classification.

Great white shark: The great white shark, also known as the white shark, is a large mackerel shark found in coastal waters of major oceans. It is the only surviving species of its genus. The largest female specimen measures about 5.83 m (19.1 ft) and weighs around 2,000 kg (4,410 lb) at maturity. They have a lifespan of up to 70 years and take over two decades to reach sexual maturity. Great white sharks can swim at speeds of 25 km/h (16 mph) and dive to depths of 1,200 m (3,900 ft).

Hammerhead shark: The hammerhead shark is a unique type of shark with a flattened and extended head called a cephalofoil. Its eyes are situated on either end of the T-shaped structure, with a small mouth in the center. Most hammerhead species belong to the genus Sphyrna, while the winghead shark is in its own genus, Eusphyra. The cephalofoil serves various purposes, such as sensory reception, maneuvering, and manipulating prey. It also provides the shark with excellent binocular vision and depth perception.

Tiger shark: The tiger shark is a large, ground-dwelling shark found in tropical and temperate waters. It is the only member of its genus and family. Female tiger sharks can grow over 5m in length. They are known for their dark stripes resembling a tiger's pattern, which fade as they mature.

Sturgeon: Sturgeon is a family of fish (Acipenseridae) comprising 28 species. They are descended from acipenseriform fish and have existed for over 174 million years. Sturgeons, along with paddlefish, belong to the Acipenseriformes group. The family includes the genera Acipenser, Huso, Scaphirhynchus, and Pseudoscaphirhynchus. Some sturgeon species are possibly extinct in the wild. They inhabit rivers, lakes, and coastlines in Eurasia, North America, and Africa.

Eel: Eels are fish that belong to the order Anguilliformes, consisting of about 1000 species. They undergo significant development, starting as larvae and growing into predators as adults.

Flying fish: Flying fish, scientifically known as Exocoetidae, are marine ray-finned fish that belong to the Beloniformes order. They are also referred to as flying cod. With around 64 species in seven genera, flying fish possess long wing-like fins that allow them to glide above the water's surface for significant distances. While they cannot truly fly like birds, they can propel themselves out of the water to evade predators like swordfish, mackerel, tuna, and marlin. However, this flight behavior also makes them vulnerable to attacks from birds such as frigate birds.

Characiformes: Characiformes is an order of fish that includes characins and related species. It consists of 18 recognized families with over 2000 different species, including famous fish like piranhas and tetras.

Characidae: The Characidae, also known as characids or characins, is a family of freshwater fish found in subtropical and tropical regions. They belong to the order Characiformes and are considered a predominantly monophyletic group. Tetras, including Hemigrammus and Hyphessobrycon, are some of the fish that are part of this family. Characidae species are both food sources and popular choices for aquariums.

Piranha: A piranha is a freshwater fish found in South American rivers, lakes, and reservoirs. It belongs to the family Serrasalmidae and is known for its predatory habits, eating both fish and plant material, making it omnivorous.

Anchovy: Anchovy fish are small forage fish from the Engraulidae family. They are commonly found in marine waters but can also live in brackish or fresh water in South America.

Herring: Herring are small, oily fish from the Clupeidae family, commonly used as forage food.

Ilish: The ilish, also called ilishi or hilsa, is a fish species closely related to herring. It is highly valued for its taste and is widely consumed in the Indian subcontinent. It holds the status of being the national fish of Bangladesh and the state fish of West Bengal.

Sardine: Sardines are small, oily fish in the herring family. The term 'sardine' originated in the 15th century and might relate to the Italian island of Sardinia, where sardines were once plentiful.

Sprat: Sprats are small, oily forage fish found in the genus Sprattus. They belong to the Clupeidae family and are often grouped with other similar small forage fish. Sprats are known for their high activity levels and travel in large schools with other fish. They swim constantly throughout the day.

Cypriniformes: Cypriniformes is an order of ray-finned fish, including carps, minnows, loaches, and relatives. It belongs to the Superorder Ostariophysi and contains 11-12 families, with over 400 genera and 4,250 species. They are highly diverse in southeastern Asia and absent from Australia and South America. The bigmouth buffalo holds the record for the longest-lived cypriniform fish at 112 years old.

Cyprinidae: Cyprinidae, also known as the carp or minnow family, is the largest and most diverse family of freshwater fish. It includes carps, true minnows, barbs, barbels, and others. With about 3,000 species, it is the largest vertebrate animal family. However, only 1,270 of these species still exist today, divided into approximately 200 valid genera. Cyprinids vary in size from 12 mm to the giant 3 m long barb. They represent more than two-thirds of the Cypriniformes order. The family name is derived from the Greek word kyprînos.

Carp: Carp, a group of freshwater fish from the family Cyprinidae, are native to Eurasia and valued for food and ornamental purposes in the Old World. However, they are considered invasive pests and often considered worthless trash fish in Africa, Australia, and most of the United States.

Goldfish: The goldfish is a popular freshwater pet, commonly kept in indoor aquariums. It belongs to the family Cyprinidae and order Cypriniformes. Unfortunately, released goldfish have become invasive in some parts of North America.

Koi: Koi, or nishikigoi, are colorful carp kept in outdoor ponds for decoration. They may be classified as a separate species in the future due to their distinction from the common carp.

Cyprinodontiformes: Cyprinodontiformes is an order of small, mostly freshwater ray-finned fish. It includes popular aquarium fish like killifish and live-bearers. They are closely related to Atheriniformes and sometimes grouped together. They are known as toothcarps, although they are not true carps and belong to the Acanthopterygii superorder, not Ostariophysi.

Guppy: The guppy, also known as the millionfish or rainbow fish, is a popular freshwater aquarium species. It is widely distributed and highly adaptable to different environments. Guppies are live-bearing and originate from northeast South America but have been introduced globally. Male guppies have ornamental fins and feed on algae and insect larvae. They are used as a model organism in ecology, evolution, and behavioral studies.

Northern pike: The northern pike is a carnivorous fish found in salty and fresh waters of the Northern Hemisphere. It belongs to the Esox genus and is known as a pike in Great Britain, Ireland, Eastern Europe, Canada, and the U.S.

Alaska pollock: The Alaska pollock, also known as walleye pollock, is a marine fish species belonging to the cod genus Gadus and family Gadidae.

Cod: Cod is a type of demersal fish belonging to the family Gadidae. It is used to refer to various fish species, but not all species in the Gadus genus are called cod.

Haddock: The haddock is a saltwater fish from the true cod family. It is found in the North Atlantic Ocean and is important for fisheries. It is marketed fresh, frozen, and smoked, including varieties like Finnan haddie and Arbroath smokie.

Stickleback: The sticklebacks are ray-finned fishes found in various water types across the Holarctic region. Initially believed to be related to pipefish and seahorses, recent studies suggest a stronger connection to eelpouts and sculpins.

Milkfish: The milkfish is a species in the Chanidae family and is the only living member. It originated during the Cretaceous period, and there are five extinct genera related to it. The term 'milkfish' comes from the Greek word khanos.

Electric eel: Electric eels, part of the Electrophorus genus, are neotropical freshwater fish found in South America. They possess a unique ability to generate electricity, delivering shocks of up to 860 volts, which they use to stun their prey. The study of their electrical capabilities since 1775 has played a significant role in the invention of the electric battery in 1800.

Oarfish: The oarfish are elongated fish found in oceans, ranging from temperate to tropical areas. They belong to the Regalecidae family and include three species in two genera. The giant oarfish holds the record for being the longest bony fish, reaching lengths of up to 11 meters (36 feet).

Anglerfish: The Anglerfish is a type of bony fish belonging to the Lophiiformes order. They have a unique way of hunting using a luminescent fin ray that acts as a lure. This light is generated by symbiotic bacteria acquired from seawater.

Mullet (fish): The mullet (fish) is a family of ray-finned fish found worldwide in coastal waters, both temperate and tropical, with some species even inhabiting fresh water. They have been a significant food source in Mediterranean Europe since ancient Roman times. The Mugilidae family consists of approximately 78 species across 20 genera.

Ophidiiformes: Ophidiiformes is an order of slender, small-headed ray-finned fish including cusk-eels, pearlfishes, and viviparous brotulas. They have smooth or no scales, a long dorsal fin, and an anal fin merging into the caudal fin. Found in tropical and subtropical regions, they inhabit freshwater, marine, and abyssal habitats. Ophidiiformes display diverse feeding methods, from parasitism to egg-laying or viviparous reproduction.

Galaxiidae: The Galaxiidae are a family of small freshwater fish mainly found in Southern Australia and New Zealand, but are also present in South Africa, southern South America, Lord Howe Island, New Caledonia, and the Falkland Islands. The common galaxias, a galaxiid species, is widely distributed in the Southern Hemisphere. These coolwater species thrive in temperate latitudes, with some adapted to subtropical habitats. Many Galaxiidae species specialize in cold, high-altitude upland rivers, streams, and lakes.

Smelt (fish): Smelt fish are small members of the Osmeridae family found in North Atlantic, North Pacific oceans, and various water bodies in Europe, North America, and Northeast Asia. They are also referred to as freshwater or typical smelts, distinguishing them from other related fish families.

Arapaima: The Arapaima is a large freshwater fish native to the Amazon and Essequibo basins in South America. They can reach lengths of up to 3 meters (9.8 feet) and are important as a food source. Overfishing and habitat loss have led to a decline in their native range. Arapaima have been introduced to other tropical regions, where they are considered invasive species. They can escape from aquaculture ponds, as seen in Kerala, India in 2018. The Portuguese name "pirarucu" translates to "red fish" in the Tupi language.

Perciformes: Perciformes, known as Acanthopteri, are ray-finned fish in the Percomorpha clade. They are commonly called perch-like fish. This group includes popular species like perch, darters, sea bass, and groupers.

Barracuda: The barracuda is a large predatory fish known for its fierce appearance and behavior. It is found in tropical and subtropical oceans worldwide, near coral reefs and sea grasses. Barracudas are targeted by sport-fishing enthusiasts.

Marlin: Marlins are fish belonging to the Istiophoridae family, with approximately 10 species.

Swordfish: The swordfish, also known as broadbills, is a large predatory fish with a long, pointed bill. They are elusive sport fish found in tropical and temperate oceans. Swordfish are round-bodied and lose their teeth and scales as adults. They can reach a length of 3 meters and weigh up to 650 kg.

Cichlid: Cichlids are fish from the family Cichlidae in the order Cichliformes. They first appeared in Tanzania about 46-45 million years ago. Cichlids are diverse and widely dispersed, with at least 1,650 scientifically described species. However, the actual number of species remains unknown, with estimates between 2,000 and 3,000. They are closely related to the convict blenny and are classified in the Cichliformes along with it.

Tilapia: Tilapia is a type of cichlid fish, consisting of about a hundred species. They are primarily found in freshwater habitats like streams, ponds, rivers, and lakes, occasionally in brackish water. These fish have been historically significant in African artisanal fishing and are increasingly important in aquaculture and aquaponics. While they can become invasive in warm-water habitats such as Australia, they cannot survive in cold water in temperate climates.

Goby: A goby is a type of fish with a large head and tapered body. They can be found in marine, brackish, and freshwater environments.

Siamese fighting fish: The Siamese fighting fish, also known as betta, is a popular freshwater fish native to Southeast Asia. It belongs to the Betta genus and is highly valued as a pet due to its vibrant colors and easy care requirements.

Mahi-mahi: The mahi-mahi, also known as dorado or dolphin, is a surface-dwelling fish found in temperate, tropical, and subtropical waters worldwide. It belongs to the Coryphaenidae family and is commonly found in the Gulf of Mexico, Costa Rica, Hawaii, and the Indian Ocean.

Perch: Perch is a type of freshwater fish belonging to the Perca genus of the Percidae family. They are part of the large order Perciformes. The name "perch" originates from the European perch, which is the type species of this genus.

Remora: The remora, also known as a suckerfish, is a type of fish with a unique oval-shaped dorsal fin that acts as a suction cup. This allows them to attach themselves firmly to larger marine animals. They range in size from 30 to 110 cm and can increase or release suction by sliding backward or swimming forward. Remoras have been observed attaching to small boats and even divers. They swim using a sinuous, or curved, motion.

Mackerel: Mackerel is a type of pelagic fish from the Scombridae family. It encompasses various species and can be found in temperate and tropical seas. These fish typically inhabit coastal areas or live offshore in the oceanic environment.

Tuna: Tuna is a saltwater fish belonging to the Thunnini tribe in the mackerel family. There are 15 species across five genera, with sizes ranging from the bullet tuna to the Atlantic bluefin tuna. The bluefin tuna can reach lengths of 2 meters (6.6 feet) and has an average lifespan of 50 years.

Serranidae: Serranidae is a large fish family that belongs to the order Perciformes. It consists of around 450 species in 65 genera, including sea basses and groupers. While many species are small, the giant grouper stands out as one of the world's largest bony fishes, reaching lengths of 2.7 m and weighing 400 kg. These fish primarily inhabit tropical and subtropical seas across the globe.

European seabass: The European seabass, also known as the European bass, is primarily an ocean-going fish found in the waters off Europe's western and southern coasts and Africa's northern coasts. It is also found in shallow coastal waters and river mouths during the summer and late autumn. It belongs to the Moronidae family, commonly known as temperate basses.

Grouper: Groupers are a type of fish found in the Epinephelinae subfamily of the Serranidae family. They belong to the Perciformes order.

Wrasse: Wrasse is a diverse family of marine fish known for their vibrant colors. With over 600 species in 81 genera, they come in different sizes, although most are small, with the largest reaching 2.5 m. They are carnivorous and feed on various small invertebrates. Some wrasses trail larger fish to scavenge disturbed prey. Certain species of wrasses seek shelter among the tentacles of coral.

Flatfish: Flatfish are ray-finned demersal fish found in the order Pleuronectiformes. They belong to the Heterosomata, sometimes considered a suborder of Perciformes. These fish have both eyes located on one side of their head, with one eye typically migrating around the head during development. Depending on the species, some face their left side upward, some face their right side upward, while others can face either side upward.

Flounder: Flounders are flatfish found worldwide, inhabiting ocean bottoms and occasionally estuaries.

Halibut: Halibut refers to three types of flatfish in the genera Hippoglossus and Reinhardtius. They belong to the family of right-eye flounders. This term is also occasionally used to describe other species of large flatfish in certain areas.

Plaice: Plaice is a type of flatfish that includes four species: European, American, Alaskan, and scale-eye plaice.

Turbot: Turbot is a large flatfish found in the Northeast Atlantic, Baltic Sea, and Mediterranean Sea. It is a demersal fish and a significant food source. In the Black Sea, it is known as the Black Sea turbot. The Northwest Atlantic has a different species called the Greenland halibut or Greenland turbot, which was involved in the "Turbot War" between Canada and Spain.

Bichir: Bichir is an archaic ray-finned fish belonging to the family Polypteridae, which is the sole family in the order Polypteriformes.

Salmonidae: Salmonidae is the only family in the Salmoniformes order, comprising over 200 species of coldwater fish known as "salmonids" or "salmonoids". These mid-level predators include salmon, trout, char, graylings, and others. They inhabit subarctic and cool temperate waters in the Northern Hemisphere. The family and order names are derived from the Latin name of the Atlantic salmon, which is also included in this family.

Salmon: Salmon is a commercially significant fish found in the North Atlantic and North Pacific. It belongs to the Salmonidae family, which includes trout, char, grayling, and other coldwater fish. These species are native to river tributaries and cooler temperate regions, with some populations in Central Asia.

Trout: Trout refers to various carnivorous freshwater fish species in the genera Oncorhynchus, Salmo, and Salvelinus. They are part of the Salmonidae family and Salmoninae subfamily. The term trout is also used for non-salmonid fish with a similar shape, like the spotted seatrout/speckled trout.

Scorpaeniformes: Scorpaeniformes is a diverse order of ray-finned fish known as lionfishes and sculpins, also called Scleroparei. It is among the top five largest orders of bony fishes, containing over 1,320 species.

Catfish: Catfish are diverse ray-finned fish known for their whisker-like barbels. They vary in size from large species like Mekong giant catfish, wels catfish, and piraíba to tiny parasitic species called candiru. Catfish can be detritivores and some are armored or naked. They belong to the Siluriformes order and have commercial and aquarium significance. They have diverse behaviors, with some being nocturnal and others crepuscular or diurnal.

Loricariidae: Loricariidae is the largest catfish family, with over 680 species and 92 genera. These fish are found in freshwater habitats of Costa Rica, Panama, and South America. They have bony plates covering their bodies and suckermouths. Some species, like Hypostomus plecostomus, are popular as aquarium fish and commonly known as "plecos".

Seahorse: Seahorses are small marine fish with a horse-like head and neck. They have segmented bony armor, an upright posture, and a curled prehensile tail. The name "Hippocampus" comes from the Greek words for "horse" and "sea monster." Seahorses, along with pipefishes and seadragons, belong to the family Syngnathidae. They are comprised of 46 different species.

Ocean sunfish: The ocean sunfish, also known as the common mola, is a large bony fish found in tropical and temperate waters worldwide. It is one of the largest bony fish, with adults weighing between 247 and 1,000 kg. The species belongs to the Mola genus in the Molidae family. The ocean sunfish is characterized by its flattened laterally body, resembling a fish head without a tail. When their dorsal and ventral fins are extended, they can be as tall as they are long.

Tetraodontidae: Tetraodontidae, also known as pufferfish, are primarily marine and estuarine fish. They belong to the order Tetraodontiformes and share similarities with porcupinefish. These unique creatures have various names such as blowfish, balloonfish, and globefish. Their scientific name refers to their four large teeth fused for crushing hard crustaceans and mollusks.

Placodermi: Placodermi is an armored class of prehistoric fish found in fossils. They lived during the Silurian and Devonian periods. With articulated plates on their head and thorax, their body was either scaled or naked. Placoderms were one of the first jawed fish, believed to have evolved jaws from gill arches.

Acanthodii: Acanthodii, an extinct class of fish, are considered to be a predecessor to living sharks, rays, and chimaeras. They possess a combination of features found in both bony fish and cartilaginous fish. Their body shape resembles that of modern sharks, but their skin is covered in small rhomboid platelets, similar to the scales of other fish.

Agnatha: Agnatha is a group of jawless fish in the phylum Chordata, including living (cyclostomes) and extinct species. Cyclostomes, the most recent members, are closely related to jawed vertebrates known as gnathostomes.

Hagfish: Hagfish are eel-shaped jawless fish found in the oceans. They have a skull but no vertebral column, though they possess rudimentary vertebrae. Hagfish are marine predators and scavengers that release large amounts of slime to defend against predators.

Lamprey: Lampreys are an ancient type of jawless fish with a toothed, sucking mouth. They belong to the order Petromyzontiformes. The name "lamprey" may come from Latin lampetra, possibly meaning "stone licker". They are often referred to as lamprey in both singular and plural form.

Ostracoderm: Ostracoderms were armored jawless fish that existed during the Paleozoic Era. Although not commonly used in classifications today because it does not represent a single evolutionary lineage, the term is still informally used to group together these ancient fishes.

Ostracod: Ostracods, also called seed shrimp, are small crustaceans belonging to the class Crustacea. They are diverse, with around 33,000 identified species grouped into 7 orders. Ostracods typically measure about 1 mm, but can range from 0.2 to 30 mm in size. Their bodies are flattened and protected by a bivalve-like shell made of chitin and calcium carbonate. Some species lack calcium carbonate. Ostracods vary in diet, with some being carnivores, herbivores, scavengers, or filter feeders, but most are deposit feeders.

Malacostraca: Malacostraca is the second largest class of pancrustaceans, with about 40,000 species divided into 16 orders. Its members, malacostracans, include crabs, lobsters, shrimp, and more. They are found in marine, freshwater, and terrestrial habitats. Malacostracans have a common body plan with 20 segments and are divided into head, thorax, and abdomen.

Woodlouse: A woodlouse is a crustacean in the suborder Oniscidea. They are called woodlice because they are commonly found in old wood. Despite their name, woodlice are not parasitic insects.

Krill: Krill are small crustaceans found in oceans worldwide. The name comes from a Norwegian word meaning "small fry of fish," often associated with certain fish species.

Decapoda: Decapoda is an order of crustaceans that includes crabs, lobsters, crayfish, shrimp, and prawns. They are mainly scavengers. The order has about 15,000 living species and 3,300 fossil species, with crabs being the most abundant. Shrimp, hermit crabs, porcelain crabs, and squat lobsters are also part of this diverse group. Their existence dates back to the Devonian period.

Crab: Crabs are crustaceans with a short "tail" hidden under the thorax. They inhabit oceans, freshwater, and land, are covered by a thick exoskeleton, and possess a single pair of pincers on each arm. Crabs emerged in the Jurassic Period.

Astacus astacus: Astacus astacus, also known as the European crayfish or noble crayfish, is the most prevalent crayfish species in Europe. It thrives in unpolluted freshwater environments and can be found in streams, rivers, and lakes across Central and Eastern Europe, as well as Scandinavia and Finland. The males can reach a length of 16 cm, while the females grow up to 12 cm. Additionally, the European crayfish holds cultural significance as a traditional food source.

Lobster: Lobsters are marine crustaceans with long bodies and muscular tails. They live in crevices or burrows on the sea floor and have three pairs of legs with claws, the first pair being the largest. Valued as seafood, lobsters are economically significant and highly profitable commodities in coastal areas.

Shrimp: A shrimp is an elongated crustacean primarily known for its swimming ability, typically belonging to the Caridea or Dendrobranchiata groups of the decapod order. However, other crustaceans are also referred to as "shrimp."

Arachnid: Arachnids are joint-legged arthropods in the class Arachnida. They belong to the subphylum Chelicerata and include spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders, and vinegaroons.

Mite: Mites are small arachnids belonging to two main orders: Acariformes and Parasitiformes. They have a simple, unsegmented body and are usually less than 1 mm in length. Mites can be found in various habitats, including water, soil, plants, and as parasites or predators. Some mites, like Varroa and scabies mites, cause harm to honey bees and humans respectively. While most mites are harmless, a few can cause allergies or transmit diseases.

Pseudoscorpion: Pseudoscorpions, or false scorpions, are small arachnids resembling scorpions. They belong to the order Pseudoscorpiones, also known as Pseudoscorpionida or Chelonethida.

Tick: Ticks are small parasitic arachnids that feed on the blood of mammals, birds, reptiles, and amphibians. They are about 3 to 5 mm in length and are found worldwide, particularly in warm and humid regions. The oldest known tick fossils date back to around 100 million years ago.

Scorpion: Scorpions are arachnids with eight legs, distinctive pincers, and a curved tail ending in a stinger. They have existed for 435 million years and inhabit various environments, except Antarctica. With over 2,500 species, scorpion taxonomy is being updated based on modern genetic research.

Spider: Spiders are arthropods with eight limbs, fangs that inject venom, and silk-producing spinnerets. They are the largest order of arachnids and can be found worldwide, except Antarctica. There are over 51,000 recorded spider species, but scientists debate about their classification.

Tarantula: Tarantulas are large, hairy spiders belonging to the family Theraphosidae. Over 1,100 species and 166 genera have been identified. The term "tarantula" is commonly used for these spiders, although other similar spiders are also referred to as tarantulas. Some tarantulas are popular in the exotic pet trade. Certain species have urticating hairs that can cause skin irritation and even eye damage.

Insect: Insects, part of class Insecta, are the largest group in the phylum Arthropoda. They have a chitinous exoskeleton, three-part body, three pairs of jointed legs, compound eyes, and a pair of antennae. Insects are incredibly diverse, with over a million described species, making up more than half of all animal species.

Pterygota: The Pterygota are a group of insects known for their wings. This subclass includes both winged insects and those that have lost their ability to fly.

Earwig: Earwigs are insects belonging to the order Dermaptera with about 2,000 species in 12 families. They have characteristic forcep-like pincers on their abdomen called cerci and membranous wings folded underneath rarely used forewings. Some groups are parasites on mammals without pincers. Earwigs can be found on all continents except Antarctica.

Flea: Fleas are small flightless insects that live as external parasites on mammals and birds, feeding on their blood. With around 2,500 species, adult fleas are brown, about 3 millimeters long, and have flattened bodies, allowing them to move through fur or feathers. They lack wings but possess hind legs specialized for jumping and claws to prevent dislodgement. Flea larvae are limbless, worm-like creatures that feed on organic debris found on their hosts' skin.

Louse: A louse is a wingless parasite insect belonging to the Phthiraptera clade, which includes around 5,000 species. Phthiraptera is classified as an order, infraorder, or parvorder depending on recent studies in phylogenetics.

Body louse: The body louse is a type of parasite that lives on human beings and feeds on their blood. It is one of three lice species that infest humans, along with the head louse and pubic louse.

Mantis: Mantis is an insect order (Mantodea) with over 2,400 species in 33 families and 460 genera. They are found worldwide in different habitats. Mantises have triangular heads with bulging eyes on flexible necks and elongated bodies. Some may have wings. All species have enlarged forelegs for catching prey. They are known for their stationary pose with folded forearms, giving rise to their name "praying mantis."

Phasmatodea: The Phasmatodea, also known as stick insects or walkingsticks, are an order of insects. They are named after their resemblance to vegetation, and their natural camouflage helps them avoid predators. Some species have startle displays, spines, or toxic secretions for additional defense. Certain stick insect genera have the world's longest insects.

Beetle: Beetles are insects belonging to the order Coleoptera. They have hardened front wings called elytra, which separate them from most other insects. With approximately 400,000 known species, beetles make up the largest order of insects, accounting for almost 40% of described insect species and 25% of all animal species. They are found in almost all habitats apart from the sea and polar regions. Beetles play various roles in their ecosystems, including feeding on plants, breaking down animal and plant debris, and consuming other invertebrates. While some species are destructive agricultural pests, others like Coccinellidae, commonly known as ladybugs, eat insects that harm crops by sucking plant juices.

Coccinellidae: Coccinellidae, commonly known as ladybugs or ladybirds, are small beetles found worldwide. They have oval bodies and domed backs with flat undersides. With over 6,000 species, they display various aposematic colors and patterns, such as red with black spots, warning predators of their unpalatable taste. Entomologists use the terms ladybird beetles or lady beetles to distinguish them from true bugs.

Dung beetle: Dung beetles are insects that consume feces and have the ability to bury dung heaps weighing 250 times their own body mass within a single night.

Firefly: Fireflies, or Lampyridae beetles, are a family of soft-bodied insects that emit light to attract mates during twilight. With over 2,000 species, their light production originated as a warning signal in larvae and evolved into a mating signal in adults. Some female fireflies even mimic the flash pattern of other species to trap males as prey.

Weevil: Weevils are small beetles with elongated snouts, known for being herbivorous. There are approximately 97,000 known species of weevils, most of which belong to the Curculionidae family. Bark beetles are also considered a subfamily of weevils. Other beetles, like the biscuit weevil, are not closely related but share the name "weevil".

Cockroach: Cockroaches, insects of the order Blattodea, include about 30 species that often inhabit human surroundings, being renowned pests.

Termite: Termites are eusocial insects that consume decaying plant material like wood, leaves, and soil humus. They have moniliform antennae and a soft-bodied worker caste, often mistaken for "white ants". Despite the name, they are not closely related to ants. There are currently 2,972 known termite species, with 2,105 belonging to the Termitidae family.

Fly: Flies are insects (order Diptera) with two wings. They use their hindwings, called halteres, as high-speed sensors for rotational movement, enabling them to perform advanced aerobatics. This large order contains approximately 1 million species, including horse-flies, crane flies, hoverflies, and mosquitoes.

Drosophila melanogaster: Drosophila melanogaster is a fly species known as the fruit fly or lesser fruit fly. It is also called the "vinegar fly," "pomace fly," or "banana fly." These flies are attracted to rotting fruit and fermenting beverages and can be found in orchards, kitchens, and pubs. They belong to the Drosophilidae family.

Black fly: Black flies, also known as blackflies, are insects belonging to the family Simuliidae. They are related to other fly families such as Ceratopogonidae, Chironomidae, and Thaumaleidae. There are over 2,200 formally named species of black flies, with 15 being extinct. They are divided into two subfamilies: Parasimuliinae and Simuliinae. The genus Simulium accounts for over 1,800 of the species.

Botfly: Botflies, or Oestridae, are parasitic flies that infest mammals internally. The larvae of these flies grow within the host's flesh or gut. While Dermatobia hominis commonly parasitizes humans, other fly species also cause myiasis in humans.

Crane fly: A crane fly is a type of insect belonging to the superfamily Tipuloidea, which includes several living families such as Cylindrotomidae, Limoniidae, Pediciidae, and Tipulidae. It also includes some extinct families. Winter crane flies, from the family Trichoceridae, are distinct from typical crane flies and are placed as their sister group within Tipulomorpha.

Calliphoridae: Calliphoridae is a family of insects in the order Diptera, with nearly 1,900 species. The larvae, called gentles, are commonly used as fishing bait. The family is polyphyletic, and there are ongoing debates about how to classify its members, some of which are sometimes considered their own families.

Tabanidae: Tabanidae is a family of true flies in the order Diptera, commonly known as horse-flies and deer flies. They are large and agile in flight, with only female horseflies biting land vertebrates for blood. They are active during the day, avoiding dark areas and are not active at night. These flies can be found worldwide, except on certain islands and polar regions. They are sometimes called gadflies, along with botflies.

Housefly: The housefly, a common fly found in houses worldwide, is believed to have originated in the Middle East. It is gray to black, with hairy bodies, four dark lines on the thorax, and red eyes. The female has slightly larger eyes than the male.

Mosquito: Mosquitoes are a family of small flies with about 3,600 species. They have a segmented body, one pair of wings, three pairs of long legs, and elongated mouthparts for piercing and sucking. They drink nectar from flowers but some female mosquitoes also feed on blood. Mosquitoes are considered micropredators, as they parasitize larger animals by consuming their blood. They are also known as disease vectors, carrying parasites and pathogens from one host to another.

Tsetse fly: Tsetse flies are large biting flies found in tropical Africa. They belong to the genus Glossina and are known for their role in transmitting diseases called trypanosomiasis. These flies are obligate parasites that feed on the blood of vertebrate animals, causing significant economic impact in sub-Saharan Africa.

Hemiptera: Hemiptera is an insect order known as true bugs, with over 80,000 species including aphids, cicadas, and bed bugs. They have piercing-sucking mouthparts and range in size from 1 mm to 15 cm. The term "true bugs" is commonly used for the suborder Heteroptera.

Aphid: Aphids are small sap-sucking insects belonging to the superfamily Aphidoidea, commonly known as greenfly and blackfly. They vary in color and can include fluffy white woolly aphids. Their life cycle involves flightless females giving birth to female nymphs, with some already pregnant, resulting in rapid multiplication. Winged females appear later in the season to colonize new plants. In temperate regions, they have a phase of sexual reproduction in autumn, often overwintering as eggs.

Bed bug: Bed bugs are parasitic insects that feed on blood, causing health impacts such as rashes, psychological effects, and allergies. Their bites result in skin changes, itching, and possible fatigue or fever. Bed bugs do not transmit infectious diseases, but complications like dead skin or vasculitis can occur rarely.

Cicada: Cicadas are insects in the superfamily Cicadoidea, found in the Hemiptera order. They belong to the suborder Auchenorrhyncha, which includes leafhoppers and froghoppers. The superfamily consists of two families, Tettigarctidae (two species in Australia) and Cicadidae (over 3,000 species worldwide, with many still undescribed).

Leafhopper: Leafhoppers, also known as hoppers, are small insects that feed on plant sap. They have hind legs designed for jumping and secrete a water-repellent substance containing pheromones. Leafhoppers undergo a partial metamorphosis and have a range of host associations. They are found globally with at least 20,000 identified species. Some species are pests or vectors for plant viruses and phytoplasmas. The Cicadellidae family is the second largest group of hemipterans.

Scale insect: Scale insects are small insects with diverse appearances and extreme differences between males and females. They are herbivores that pierce plants to feed on sap, producing honeydew which attracts sooty mold. Females lack limbs and are covered by protective domed scales. Some species are hermaphroditic, and males resemble small flies with legs and sometimes wings. Ants often form mutualistic relationships with scale insects, feeding on honeydew and protecting them. There are approximately 8,000 known species.

Whitefly: Whiteflies are Hemipterans that suck sap from plant leaves. They belong to the family Aleyrodidae, which is the only family in the superfamily Aleyrodoidea. Over 1550 whitefly species have been identified.

Hymenoptera: Hymenoptera is a large insect order including sawflies, wasps, bees, and ants. This diverse group consists of over 150,000 known species, with some being extinct. Many Hymenoptera species are parasitic. Females have a specialized ovipositor that can act as a stinger. These insects undergo holometabolism, characterized by larval and pupal stages before reaching maturity.

Ant: Ants are eusocial insects that evolved from vespoid wasps. They belong to the order Hymenoptera and have around 13,800 classified species out of an estimated total of 22,000. Ants are easily recognized by their elbowed antennae and the node-like structure of their waists.

Carpenter ant: Carpenter ants are large ants found in forested areas worldwide.

Fire ant: Fire ants are a group of over 200 stinging ant species in the Solenopsis genus. They are known for their painful stings, and are commonly referred to as ginger ants or tropical fire ants. Other species of ants, such as Myrmica rubra and Pogonomyrmex barbatus, are sometimes mistakenly called red ants due to their similar coloration.

Bee: Bees are winged insects closely related to wasps and ants. They are known for their roles in pollination and honey production. There are over 20,000 known species of bees, living in colonies or as solitary insects. Bees play a crucial role in maintaining ecosystems and are considered a clade within the superfamily Apoidea.

Bumblebee: A bumblebee is a type of bee found in the Northern Hemisphere. They belong to the genus Bombus and are known for their ability to sting repeatedly. Bumblebees primarily live in higher altitudes or latitudes and are also found in South America. Some species have been introduced to New Zealand and Tasmania.

Africanized bee: The Africanized bee, commonly known as the "killer bee", is a hybrid of the western honey bee. It was created by crossbreeding the East African lowland honey bee with European honey bee subspecies like the Italian and Iberian honey bees.

Western honey bee: The western honey bee, also known as the European honey bee, is the predominant species among 7-12 honey bee species globally. Its genus name, Apis, means "bee" in Latin, while mellifera refers to its honey production.

Wasp: A wasp is an insect from the suborder Apocrita in the Hymenoptera order, distinct from bees and ants. It is not a clade, but bees and ants have evolved from wasp ancestors. Some wasps can sting their prey.

Hornet: Hornets are the largest eusocial wasps, resembling yellowjackets. Some can grow up to 5.5 cm in length. They have a distinctively large top margin on their heads. There are 22 recognized species of Vespa worldwide, mostly found in the tropics of Asia. However, the European hornet is widely distributed in Europe, Russia, North America, and north-eastern Asia. In North America, wasps in the Dolichovespula genus are often called hornets but are actually yellowjackets.

Lepidoptera: Lepidoptera is an order of winged insects, encompassing butterflies and moths. With 180,000 described species, it represents 10% of all known living organisms. It is the second-largest insect order, comprising 126 families, 46 superfamilies, and is highly recognizable worldwide.

Butterfly: Butterflies are colorful, winged insects belonging to the suborder Rhopalocera. They have large, vibrant wings that fold when resting and fly with a distinct flutter. Butterflies are part of the superfamilies Hedyloidea and Papilionoidea. Fossil records suggest their existence since the Paleocene, roughly 56 million years ago.

Swallowtail butterfly: Swallowtail butterflies are a diverse group of over 550 large and colorful butterfly species found on every continent except Antarctica. They are known for including the world's biggest butterflies, the Ornithoptera birdwings.

Pieris brassicae: Pieris brassicae, known as the large white or cabbage butterfly, is a butterfly species belonging to the Pieridae family. It is closely related to the small white butterfly, Pieris rapae. Its common name, the cabbage butterfly, reflects its habit of feeding on cabbage plants. The large white butterfly can be found in various regions, including India where it is referred to as the large cabbage white.

Bombyx mori: The domestic silk moth, Bombyx mori, is a valuable insect known for its production of silk. It is closely related to the wild silk moth, Bombyx mandarina. The larva of the silk moth is called a silkworm, which feeds on white mulberry leaves. Domestic silk moths have been selectively bred by humans for thousands of years, making them entirely dependent on humans for reproduction. Wild silk moths, on the other hand, are not as useful for silk production.

Geometer moth: Geometer moths, belonging to the family Geometridae, are insects in the order Lepidoptera. They are named after the way their larvae, known as inchworms, appear to measure the earth as they move. With around 23,000 described species, they are a large family, and over 1,400 species are indigenous to North America alone. Notable among them is the peppered moth, studied extensively in population genetics. Geometer moths include several pest species.

Lymantria dispar dispar: Lymantria dispar dispar, also called the gypsy moth, is a widespread moth species originally from Eurasia. It belongs to the Erebidae family and can be found in Europe, Africa, and North America.

Moth: Moths are a diverse group of insects, belonging to the order Lepidoptera but distinct from butterflies. They outnumber butterflies and comprise around 160,000 species, with numerous undescribed ones. Moths are mainly nocturnal, though some are active during dawn and dusk.

Odonata: Odonata is an order of flying insects, comprising dragonflies and damselflies. Dragonflies are generally larger, with spread-out wings at rest and large compound eyes, while damselflies are smaller, with folded wings along their bodies and eyes placed apart. Although adult odonates can land, they rarely walk.

Damselfly: Damselflies are small flying insects found on every continent except Antarctica. They belong to the suborder Zygoptera and have slim bodies. Unlike dragonflies, they fold their wings along their body when at rest. These fascinating creatures have been around since the Jurassic period.

Dragonfly: Dragonflies are flying insects with large compound eyes and strong transparent wings. There are about 3,000 known species, mostly found in tropical regions. Loss of wetland habitat poses a threat to their populations worldwide. Their bodies are elongated and many have vibrant iridescent or metallic colors. Adult dragonflies' compound eyes have around 24,000 ommatidia each.

Orthoptera: Orthoptera is an insect order that includes grasshoppers, locusts, and crickets along with related insects like bush crickets and wētā. It is divided into two suborders: Caelifera, which comprises grasshoppers and locusts, and Ensifera, which includes crickets and related species.

Cricket (insect): Crickets are orthopteran insects related to bush crickets and grasshoppers. They are now classified in the superfamily Grylloidea. The term is also used to describe related insects like king crickets and mole crickets.

Grasshopper: Grasshoppers are ancient chewing herbivorous insects that have been around for 250 million years. They belong to the suborder Caelifera and are among the most ancient living groups of insects.

Mole cricket: Mole crickets are fossorial insects known for their cylindrical bodies and burrowing capabilities. They belong to the Gryllotalpidae family in the Orthoptera order. These insects grow up to 3-5 cm long and have small eyes and shovel-like forelimbs for digging. Mole crickets can be found worldwide and may become agricultural pests in new regions.

Locust: Locusts are a type of grasshopper that have a swarming phase. They are usually solitary but can become gregarious under certain conditions. There is no taxonomic distinction between locusts and grasshoppers, the defining factor is their ability to form swarms. This behaviour has evolved independently in at least 18 genera across 5 different subfamilies of the Acrididae family.

Tettigoniidae: Tettigoniidae, or katydids, are insects in the suborder Ensifera. They are also known as bush crickets or long-horned grasshoppers. With over 8,000 known species, they are the only family in the superfamily Tettigonioidea that still exists today.

Hexapoda: Hexapoda is a subphylum of arthropods including the largest number of species. It consists of Insecta and a smaller class called Entognatha. Insects and springtails are major pollinators, consumers, scavengers, and micropredators in terrestrial habitats.

Springtail: Springtails, or Collembola, are the largest of the modern hexapods no longer classified as insects. While grouped in the class Entognatha due to their internal mouthparts, they are not more closely related to each other or insects with external mouthparts.

Myriapoda: Myriapoda is a subphylum of arthropods including millipedes and centipedes. It consists of approximately 13,000 terrestrial species.

Centipede: Centipedes are venomous arthropods with elongated segmented bodies and one pair of legs per segment. They belong to the class Chilopoda and are part of the larger group of Myriapoda, which includes millipedes. Centipedes inject venom through modified legs called forcipules, but do not have fangs. Despite their name, the number of legs in centipedes ranges from 15 to 191 pairs and is always an odd number.

Millipede: Millipedes, scientifically called Diplopoda, are arthropods with two pairs of legs on most body segments. They have elongated bodies with more than 20 segments, although pill millipedes are shorter and can curl up into a ball. Contrary to their name meaning "thousand feet," no species had more than a thousand legs until the discovery of Eumillipes persephone in 2020. There are around 12,000 named species of millipedes, making Diplopoda the largest class of myriapods, which includes centipedes and other multi-legged creatures.

Chelicerata: Chelicerata is a subphylum of Arthropoda, containing sea spiders, horseshoe crabs, arachnids, and some extinct species. Key features include a variety of arthropods with specialized appendages called chelicerae and the inclusion of both living and extinct lineages.

Xiphosura: Xiphosura is an order of arthropods, closely related to arachnids, commonly known as horseshoe crabs. They originated in the Hirnantian period and only four living species exist today. Xiphosura includes the suborder Xiphosurida and several stem-genera.

Eurypterid: Eurypterids, commonly known as sea scorpions, were diverse arthropods that lived around 467.3 million years ago. They first appeared in the Early Ordovician or Late Cambrian period and became prominent during the Silurian. Eurypterids were the most diverse chelicerate order of the Paleozoic era, with about 250 species. The genus Eurypterus from the Silurian comprises over 90% of the known specimens. Despite diversifying in the Devonian period, they were greatly impacted by the Late Devonian extinction event and eventually went extinct during the Permian-Triassic extinction event around 251.9 million years ago.

Trilobite: Trilobites were ancient marine arthropods that existed for about 270 million years. They were one of the earliest groups of arthropods and had over 22,000 species. Trilobites first appeared in the fossil record during the Early Cambrian period and thrived until the Devonian, when most orders became extinct. The last trilobites disappeared during a mass extinction at the end of the Permian, about 251.9 million years ago. Despite their extinction, trilobites were incredibly successful and played a significant role in early ocean ecosystems.

Mollusca: Mollusca is the second-largest phylum in the animal kingdom, comprising mollusks. There are around 76,000 known living species and an estimated 60,000 to 100,000 fossil species. The proportion of undescribed species is considerably high, leaving many taxa poorly studied.

Clam: Clams are bivalve molluscs that are often edible and live halfway buried in sand or mud. They have two equal-sized shells and a strong burrowing foot, and can be found in both freshwater and marine environments. Clam diversity is highest in North America.

Mussel: Mussels are bivalve molluscs found in both saltwater and freshwater. They have elongated and asymmetrical shells, distinguishing them from other edible clams that are more rounded or oval.

Oyster: Oyster is a type of salt-water bivalve mollusc found in marine or brackish environments. It has calcified valves and often exhibits irregular shapes. Some oysters belong to the Ostreoidea superfamily.

Scallop: A scallop is a type of marine mollusk belonging to the Pectinidae family. It includes different species, and the common name "scallop" is also used for similar species in related families like thorny oysters.

Octopus: Octopuses are soft-bodied molluscs with eight limbs, belonging to the order Octopoda. They can alter their shape to fit through small spaces and use a siphon for breathing and movement. As part of the class Cephalopoda, they share characteristics with squids, cuttlefish, and nautiloids. Octopuses possess a complex nervous system, excellent eyesight, and are highly intelligent and behaviorally diverse.

Squid: A squid is a soft-bodied mollusc with a distinct head, large eyes, and eight arms. They also have two tentacles and often possess a rod-like internal skeleton. Squid are part of the Decapodiformes superorder, although other molluscs are sometimes called squid.

Slug: A slug is a shell-less terrestrial gastropod mollusc often referred to as part of the common name for any mollusc without a shell, including sea slugs and semi-slugs.

Snail: A snail is a shelled gastropod that includes land, sea, and freshwater species. They have a coiled shell that allows complete retraction for protection. Snails are part of the Gastropoda class, while shell-less or partially shelled land snails are known as slugs or semi-slugs.

Conch: The term 'Conch' refers to several medium-to-large-sized sea snails with distinct features such as a high spire and a noticeable siphonal canal.

Cnidaria: Cnidaria is a phylum of aquatic animals found in freshwater and marine environments, such as jellyfish, sea anemone, corals, and tiny marine parasites. They have a decentralized nervous system and specialized cells called cnidocytes or cnidoblasts for envenomation and capturing prey. Their bodies are composed of a gelatinous substance called mesoglea, protected by thin layers of epithelium.

Coral: Corals are marine invertebrates that form colonies of polyps. They are vital for building reefs in tropical oceans by secreting calcium carbonate to create a hard skeleton.

Jellyfish: Jellyfish, or sea jellies, are gelatinous creatures that belong to the subphylum Medusozoa, which is a significant group within the phylum Cnidaria.

Echinoderm: Echinoderms are marine animals with radial symmetry found at every ocean depth. They include starfish, sea urchins, and sea cucumbers. With about 7,000 living species, they are the second-largest group of deuterostomes, after chordates. Echinoderms are the largest marine phylum and first appeared in the Cambrian period.

Sea cucumber: Sea cucumbers are marine echinoderms with a leathery skin and an elongated body. They have a single, branched gonad and are found worldwide on the sea floor. There are about 1,786 known species, with the highest number in the Asia-Pacific region. Some are harvested for human consumption and cultivated in aquaculture systems. Sea cucumbers play a vital role in the marine ecosystem by recycling nutrients and aiding in the decomposition of detritus and organic matter.

Sea urchin: Sea urchins are spiny echinoderms found in oceans worldwide. They vary in species, with about 950 types inhabiting different depths. Their hard shells are spherical and covered in spines, ranging from 3 to 30 cm in length. Sea urchins move slowly using tube feet and eat algae as well as other slow-moving animals. They face predators such as fish, starfish, crabs, marine mammals, and even humans.

Starfish: Starfish, or sea stars, are star-shaped echinoderms from the class Asteroidea. They are often confused with brittle stars or basket stars. These creatures, also known as asteroids, live in various marine environments worldwide, ranging from tropical to polar regions. With around 1,900 species, starfish inhabit ocean floors from the intertidal zone to depths of 6,000 m (20,000 ft).

Sponge: Sponges, part of the Porifera phylum, are primitive animals closely related to diploblasts. They are multicellular and characterized by their porous bodies and intricate water circulation system. Sponges consist of a jelly-like mesohyl sandwiched between two thin cell layers.

Nematode: Nematodes, or roundworms, are a diverse group of animals found in various environments. While most species are free-living and feed on microorganisms, many nematodes are parasitic. The parasitic nematodes, known as helminths, are responsible for soil-transmitted helminthiases.

Caenorhabditis elegans: Caenorhabditis elegans is a type of nematode that is about 1 mm in length. It is a free-living, transparent organism found in temperate soil environments. The name combines Greek and Latin words to describe its recent, elegant, and rod-like characteristics. Initially named Rhabditides elegans, it was later placed in the subgenus Caenorhabditis and ultimately raised to the status of a genus.

Tardigrade: Tardigrades, also called water bears or moss piglets, are tiny segmented animals with eight legs. They were originally identified by Johann August Ephraim Goeze in 1773, who named them Kleiner Wasserbär. Later, Lazzaro Spallanzani coined the term Tardigrada, meaning "slow steppers."

Annelid: Annelids, or segmented worms, make up a vast phylum with over 22,000 species. They can be found in diverse habitats such as marine tidal zones, hydrothermal vents, freshwater, and moist terrestrial environments. Some well-known examples are earthworms, leeches, and ragworms.

Leech: Leeches are segmented worms that are either parasites or predators. They are closely related to earthworms and have soft, muscular bodies that can stretch. Leeches have suckers at both ends and ring markings that don't match their internal segments. They are hermaphrodites with a clitellum. Leeches have a muscular and solid body, with a reduced spacious body cavity called a coelom.

Polychaete: Polychaetes are marine annelid worms with bristles and fleshy protrusions called parapodia. They are a diverse group with over 10,000 species, including well-known examples like the lugworm and clam worm.

Earthworm: An earthworm is a soil-dwelling invertebrate belonging to the phylum Annelida. It is the largest member of the class Oligochaeta and is commonly known by various names like "dew-worm", "rainworm", and "nightcrawler". Earthworms have a distinct clitellum and a vascular system with true capillaries. They are part of the suborder Lumbricina, although their classification may change. They are found in terrestrial environments and are different from microdriles found in semi-aquatic families.

Bryozoa: Bryozoa are small aquatic invertebrate animals living in sedentary colonies. They have a lophophore, a feeding structure with tentacles for filter feeding. Most are found in tropical waters, but some live in oceanic trenches and polar waters. They are classified into marine, freshwater, and mostly-marine species. There are 5,869 known living species, with only a few solitary genera.

Flatworm: Flatworms, or Platyhelminthes, are simple invertebrates with a flattened body shape. They lack specialized circulatory and respiratory organs, which limits their form to facilitate oxygen and nutrient exchange through diffusion. They are acoelomates, meaning they lack a body cavity, and their digestive system has a single opening for both taking in and eliminating food. This restricts their ability to process food continuously.

Cestoda: Cestoda is a class of parasitic flatworms. The subclass Eucestoda includes ribbon-like tapeworms, known for their proglottids that contain eggs shed to infect other organisms. The other subclass, Cestodaria, primarily consists of fish-infecting parasites.

Green algae: Green algae are a diverse group that includes unicellular and colonial flagellates, as well as various forms of seaweed. They are part of the larger clade Viridiplantae, which also includes land plants. With approximately 22,000 species, green algae display a range of lifestyles, from single-cell organisms to complex multicellular seaweeds.

Charophyta: Charophyta is a group of freshwater green algae known as charophytes. They are sometimes considered a division, superdivision, or an unranked clade. Terrestrial plants, called Embryophyta, evolved from Charophyta, possibly from unicellular charophytes. The class Zygnematophyceae is closely related to Charophyta.

Chlorophyta: Chlorophyta, also known as chlorophytes, is a taxon of green algae. It can refer to either a diverse group of green algae, including about 7,000 species, or a narrower group that includes about 4,300 species. These organisms are mainly found in freshwater environments. Like land plants, they contain chlorophyll a and chlorophyll b, and store food as starch in their plastids.

Lycophyte: Lycophytes are ancient vascular plants that include the clubmosses. They are among the oldest living plants and have extinct species dating back to the Silurian period. Lycophytes were dominant during the Carboniferous period, with tree-like species reaching over 40 meters in height. However, modern lycophytes are relatively small plants.

Bryophyte: Bryophytes are non-vascular land plants, including liverworts, hornworts, and mosses. They are small in size and thrive in moist environments, but can adapt to drier conditions. With around 20,000 species, they reproduce through spores and fragmentation, lacking flowers or seeds. Recent evidence supports the classification of bryophytes as a monophyletic group. The term "bryophyte" stems from the Greek words for tree moss and plant.

Hornwort: Hornworts are non-vascular plants belonging to the division Anthocerotophyta. They are characterized by elongated horn-like structures called sporophytes. Like mosses and liverworts, hornworts have a life cycle dominated by the gametophyte stage, and their plant body is green and flattened.

Marchantiophyta: The Marchantiophyta, also known as hepatics or liverworts, are non-vascular land plants. They have a gametophyte-dominant life cycle and carry only one set of genetic information.

Moss: Mosses are small, non-vascular plants that belong to the taxonomic division Bryophyta. They form dense green clumps in damp or shady places. Mosses have simple leaves, attached to a stem with limited water and nutrient conducting ability. They reproduce without seeds and develop sporophytes with capsules containing spores. Mosses vary in height, with the tallest known species reaching 50 cm. There are approximately 12,000 species of moss worldwide.

Sphagnum: Sphagnum is a genus of mosses known as sphagnum moss or bog moss. It has around 380 accepted species. Sphagnum can store significant amounts of water in both living and dead plants. Its cells can hold 16 to 26 times more water than their dry weight. The empty cells also aid in retaining water in dry conditions.

Pteridophyte: Pteridophytes are non-flowering vascular plants that disperse spores for reproduction. They are commonly known as "cryptogams" since they lack flowers and seeds.

Fern: Ferns are vascular plants that reproduce through spores and lack seeds or flowers. They have specialized tissues for conducting water and nutrients, distinguishing them from mosses. The dominant phase of their life cycle is the branched sporophyte.

Equisetum: Equisetum is a single genus in the Equisetaceae family, consisting of vascular plants that reproduce through spores instead of seeds.

Gymnosperm: Gymnosperms are seed-producing plants like conifers, cycads, Ginkgo, and gnetophytes. The name comes from the Greek word for "naked seeds" because their seeds are not enclosed within an ovary. Gymnosperm seeds develop on scales, leaves, or independently. Their life cycle involves both a dominant diploid sporophyte phase and a reduced haploid gametophyte phase. The term is often used to refer to all non-flowering seed plants in paleobotany.

Cycad: Cycads are seed plants with stout trunks and crown of large evergreen leaves. They come in different sizes, have separate male and female plants, and grow slowly. Though often mistaken for palms or ferns, they are not related to either group.

Ginkgo biloba: Ginkgo biloba, also known as ginkgo or maidenhair tree, is a gymnosperm tree native to East Asia. It is the last living species in the Ginkgoales order, dating back over 290 million years. Fossils resembling the modern species have been found from around 170 million years ago. As a living fossil, ginkgo has been cultivated throughout human history and is still commonly planted today.

Conifer: Conifers are cone-bearing seed plants, part of the Pinophyta division. They are mostly trees with secondary growth. Examples include cedars, Douglas-firs, cypresses, pines, and spruces. The division contains 7 families, 60-65 genera, and over 600 living species.

Cupressus: Cupressus is a genus of evergreen conifers in the family Cupressaceae. It is known as cypress and is considered a polyphyletic group. The genus Cupressus is found in the subfamily Cupressoideae. The common name "cypress" originated from the Old French cipres, derived from the Latin cyparissus, which in turn is the Latin version of the Greek word κυπάρισσος (kypárissos).

Juniper: Junipers are coniferous trees and shrubs found widely in the Northern Hemisphere. There are between 50 and 67 species of junipers, distributed from the Arctic to tropical Africa, and throughout parts of Asia and Central America. They can grow at high altitudes, with the highest-known juniper forest located in southeastern Tibet and the northern Himalayas, forming one of the highest tree lines on earth at 4,900 meters (16,100 ft).

Sequoioideae: Sequoioideae, also known as Redwoods, are a subfamily of coniferous trees in the Cupressaceae family. They are found in the northern hemisphere and are admired for being the largest and tallest trees in the world. These remarkable trees are frequently planted as ornamentals. Austrosequoia, a related genus, thrived until the Oligocene epoch in prehistoric times.

Cedrus: 'Cedrus', commonly known as cedar, is a genus of coniferous trees in the Pinaceae family. These trees are found in the western Himalayas and the Mediterranean region, with altitudes ranging from 1,000 to 3,200 m.

Douglas fir: The Douglas fir, a pine tree species, is native to western North America. It is an evergreen conifer and has three varieties: coast, Rocky Mountain, and Mexican Douglas-fir. Also known as Douglas-fir, it is sometimes referred to as Douglas spruce, Oregon pine, or Columbian pine.

Fir: Firs are evergreen coniferous trees in the Abies genus (Pinaceae family). They include around 48-56 species found in mountainous regions across North and Central America, Europe, Asia, and North Africa. Firs are closely related to Cedrus (cedar).

Pine: A pine is a coniferous tree in the genus Pinus of the Pinaceae family. There are 187 recognized species of pines, with 121 species accepted by various societies. Pines are primarily found in the Northern Hemisphere and their lumber is widely used. The pine family is the largest conifer family with 818 named cultivars recognized by the ACS. Pines are also famous as Christmas trees.

Spruce: Spruce trees are coniferous evergreen trees found in the northern temperate and boreal regions. They belong to the genus Picea and are distinguished by their large size, whorled branches, and conical shape. Spruce needles are four-sided and attach singly to peg-like structures on the branches. Their cones hang downwards after pollination. Unlike other pine family members, spruce trees have rough branches due to retained pegs.

Podocarpus: Podocarpus is a widespread genus of conifers in the Podocarpaceae family, known for being evergreen shrubs or trees. They can reach heights of up to 40 meters and have cone scales that fuse together to form a colorful, berry-like receptacle. These fleshy cones attract birds, aiding in seed dispersal. The genus comprises around 97 to 107 different species, depending on classification.

Araceae: Araceae is a family of flowering plants characterized by flowers borne on a spadix within a spathe. It is commonly known as the arum family or aroids. With 140 genera and around 4,075 known species, it is most diverse in the New World tropics but also found in Old World tropics and northern temperate regions.

Anthurium: Anthurium is a large genus of flowering plants, with approximately 1,000 species. It belongs to the arum family, Araceae. Common names for Anthurium include tailflower, flamingo flower, and laceleaf.

Philodendron: Philodendron is a popular genus of flowering plants in the Araceae family. It is the second-largest genus in the family, with around 489 accepted species. Despite its popularity, there are still many undescribed species within the genus. Philodendrons are commonly grown as ornamental and indoor plants. The name Philodendron comes from Greek and means "love for trees." It is often used as the English name for these plants.

Arecaceae: Arecaceae is a family of perennial plants known as palms. They can be climbers, shrubs, or tree-like with large, compound, evergreen leaves called fronds. Palm trees are the ones with a tree-like form. There are 181 genera and around 2,600 species, mostly found in tropical and subtropical climates. Palms are diverse in physical characteristics and adapt to various habitats, ranging from rainforests to deserts.

Agave: Agave is a genus of plants mostly found in arid regions of the Americas and the Caribbean, with some species also existing in temperate and tropical areas of North America. Known for their succulent and drought-resistant nature, these plants grow in rosettes with thick, fleshy leaves. The genus has absorbed species from other genera like Manfreda, ×Mangave, Polianthes, and Prochnyanthes.

Aloe: Aloe is a genus of over 650 flowering succulent plants. The most famous species is Aloe vera, cultivated as a primary source for various pharmaceutical uses. Other species like Aloe ferox are also utilized for similar purposes, either cultivated or harvested from the wild.

Amaryllis: Amaryllis is a small genus of flowering bulbs with two species. Amaryllis belladonna, the better known species, is native to the rocky southwest area between the Olifants River Valley and Knysna in the Western Cape region of South Africa.

Gladiolus: The Gladiolus is a perennial flowering plant found in the iris family. It has corms and produces beautiful flowers.

Iridaceae: Iridaceae is a plant family in the order Asparagales, commonly known as irises. With a broad global distribution, it consists of 69 accepted genera and approximately 2500 species. Notably, it includes economically important plants like Freesia, Gladiolus, Crocus, and saffron.

Iris(plant): Iris is a genus of 310 flowering plant species known for their showy flowers. The name applies to all Iris species, including those in closely related genera. Some species are also called flags, while those in the Scorpiris subgenus are known as junos. This popular garden flower is widely used in horticulture.

Lily of the valley: The Lily of the valley is a woodland plant with sweetly scented white bell-shaped flowers. It grows in Asia, Europe, and North America.

Narcissus(plant): Narcissus is a spring-flowering perennial plant, belonging to the amaryllis family, and is commonly known as daffodil, narcissus, or jonquil. It has distinctive flowers with six petal-like tepals and a cup- or trumpet-shaped corona. The flowers are mostly white and yellow, with varying colors in the tepals and corona.

Orchid: Orchids are flowering plants known for their vibrant and fragrant blooms, and they belong to the Orchidaceae family. They are found in all habitats on Earth, except glaciers, and are most diverse in tropical regions.

Yucca: Yucca is a genus of shrubs and trees known for their evergreen, sword-shaped leaves and large clusters of white flowers. With around 40-50 species, they are found across the Americas and the Caribbean, adapting to diverse environments from rainforests to arid deserts. Part of the Asparagaceae family, Yuccas are characterized by their tough foliage and ability to thrive in various habitats.

Pontederia crassipes: Pontederia crassipes, also called common water hyacinth, is an aquatic plant native to South America but now found worldwide. It is invasive and can quickly spread beyond its natural habitat. It is the only species in its subgenus and is notorious for its aggressive growth, earning the nickname "terror of Bengal."

Alstroemeria: Alstroemeria, known as the Peruvian lily or lily of the Incas, is a South American genus of flowering plants. They are native to South America, with some species found in the United States, Mexico, Australia, New Zealand, Madeira, and the Canary Islands. There are two centers of diversity for Alstroemeria: central Chile and eastern Brazil. The Chilean species are winter-growing, while the Brazilian ones are summer-growing. Most Alstroemeria species are long-lived perennials, except for A. graminea, an annual found in the Atacama Desert of Chile.

Colchicum: Colchicum is a toxic genus of perennial flowering plants with around 160 species. They grow from bulb-like corms and belong to the Colchicaceae family. Colchicum is native to West Asia, Europe, parts of the Mediterranean and East African coasts. The flowers have underground ovaries, resulting in exceptionally long styles, often over 10 cm.

Liliaceae: Liliaceae is a family of flowering plants with around 610 species in 15 genera. They are monocotyledonous perennials, often bulbous geophytes, with large flowers arranged in threes. The leaves are linear and parallel-veined. Most species are grown from bulbs or rhizomes. The family has diverse morphology despite genetic similarity. Originally described in 1789, it is now a catch-all group for various lilioid monocots that do not fit into other families or orders.

Lilium: Lilium is a genus of flowering plants with large, prominent flowers. They are known as the true lilies and are culturally significant worldwide. Native to the Northern Hemisphere, they thrive in temperate climates and subtropics. Other plants may have "lily" in their names, but they are not true lilies and belong to different genera.

Tulip: Tulips are perennial flowers known for their large and brightly colored blooms. They belong to the Tulipa genus and can be red, orange, pink, yellow, or white, often with a different colored blotch at the base. Classification of tulips has been complex due to variability and cultivation history. They are part of the lily family, Liliaceae, closely related to Amana, Erythronium, and Gagea in the Lilieae tribe.

Pandanus: Pandanus is a genus of palm-like trees and shrubs found in the Old World tropics and subtropics. With 578 accepted species, it is known for its dioecious nature and is native to Madagascar and Malaysia. Commonly called pandan, screw palm, or screw pine, these plants belong to the Pandanales order and Pandanaceae family.

Bromeliaceae: The Bromeliaceae is a family of flowering plants, consisting of approximately 80 genera and 3700 known species. Mostly found in the tropical Americas, with a few species in American subtropics and one in tropical west Africa (Pitcairnia feliciana).

Puya(plant): Puya is a genus of the Bromeliaceae family, consisting of 226 species primarily found in the Andes Mountains of South America and southern Central America. These terrestrial plants are unique as they belong to the subfamily Puyoideae. One notable characteristic is that many Puya species are monocarpic, meaning they die after producing only one flower and set of seeds.

Spanish moss: Spanish moss is a flowering plant that thrives on trees in tropical and subtropical areas. It can be found in Mexico, Bermuda, the Bahamas, Central and South America, the Southern United States, and the West Indies. This epiphytic plant is known as "grandpa's beard" in French Polynesia and even naturalized in Queensland, Australia.

Cyperaceae: Cyperaceae is a family of flowering plants known as sedges. It includes around 5,500 species in about 90 genera, with the largest genus being Carex, which has over 2,000 species.

Juncus: Juncus is a large genus of flowering plants known as rushes, belonging to the family Juncaceae. With around 300 species, it is the largest genus in this family.

Poaceae: Poaceae, also known as Gramineae, is a widespread family of flowering plants called grasses. It encompasses cereal grasses, bamboos, grasses found in natural grasslands, and those cultivated in lawns and pastures. Collectively, these are referred to as grass.

Bamboo: Bamboo is a diverse group of perennial plants in the grass family. Some species, like Dendrocalamus sinicus, can grow up to 46 meters long and weigh up to 450 kilograms. They have long internodes, with some reaching up to 5 meters in length. However, there are also small varieties like Raddiella vanessiae, which are only 10-20 millimeters long. The word "bamboo" has uncertain origins but likely originated from Dutch, Portuguese, Malay, or Kannada languages.

Sugarcane: Sugarcane is a flowering plant belonging to the grass family and is used for sugar production. It has tall stalks rich in sucrose, primarily grown in tropical regions. In 2020, it was the world's largest crop, with Brazil being the top producer. Sugarcane accounts for 79% of global sugar production, and the main commercial varieties are hybrids of Saccharum officinarum.

Typha: Typha is a genus of around 30 monocotyledonous flowering plants in the Typhaceae family. They are known by various names, such as bulrush, reedmace, reed, cattail, punks, cumbungi, and raupo, depending on the country. Some sedges in Scirpus and related genera can also be referred to as bulrush.

Canna(plant): Canna, also known as canna lily, is a genus of flowering plants belonging to the family Cannaceae. It includes 10 species that are native to the American tropics and have been naturalized in Europe, India, and Africa since the 1860s. While originally tropical, most cultivars have been developed in temperate climates and can be easily grown in many countries as long as they receive 6-8 hours of sunlight during the summer and are moved to a warm location in winter. You can find photographs of various Canna cultivars in the Canna cultivar gallery.

Heliconia: Heliconia is a genus of flowering plants in the Heliconiaceae family. It includes 194 species, mainly found in the tropical Americas and a few islands in the western Pacific and Indonesia. These plants mostly thrive in tropical forests. Some Heliconia species are vulnerable or data deficient according to the IUCN Red List. Many species are cultivated as ornamentals, and a few have naturalized in places like Florida, Gambia, and Thailand.

Apiaceae: Apiaceae, also known as the celery family, is a family of aromatic flowering plants, including well-known plants like carrot, celery, and parsley. It is the 16th-largest family of flowering plants, with over 3,800 species in about 446 genera, and contains economically important plants such as caraway, coriander, and dill. The family also includes the uncertain and possibly extinct plant called silphium.

Hedera: Hedera is a genus of evergreen climbing or ground-creeping plants in the Araliaceae family. It consists of 12-15 species native to Western Europe, Central Europe, Southern Europe, Macaronesia, northwestern Africa, and central-southern Asia. These plants are commonly known as ivy and are cultivated for their ornamental climbing. The most recognizable species, known as English ivy in North America, is frequently planted to cover brick walls.

Asteraceae: Asteraceae, also known as Compositae, is a plant family consisting of over 32,000 known species in over 1,900 genera. It belongs to the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, it was first described in 1740. With its extensive species count, Asteraceae is only rivaled by Orchidaceae. The exact family with more species remains uncertain as the total number of species in each family is unknown.

Bellis perennis: Bellis perennis, also called the daisy, is a common European plant belonging to the Asteraceae family. It is recognized as the classic example of a daisy and is referred to as common daisy, lawn daisy, or English daisy to differentiate it from other daisy-like plants.

Chrysanthemum: Chrysanthemums, also known as mums or chrysanths, are flowering plants in the Asteraceae family. They are native to East Asia and northeastern Europe, with China being the center of diversity. Chrysanthemums have numerous horticultural varieties and cultivars.

Cirsium: Cirsium is a genus of flowering plants in the Asteraceae family, commonly known as thistles. They are called plume thistles due to their feathered hairs on their achenes, distinguishing them from other thistle genera that have unbranched hairs.

Dahlia: Dahlia is a vibrant genus of perennial plants native to Mexico and Central America. It belongs to the Asteraceae family, along with sunflowers, daisies, chrysanthemums, and zinnias. With 49 species and stunning flowers in a wide range of colors, dahlias are widely cultivated as beautiful garden plants.

Solidago: Solidago, or goldenrods, are flowering plants in the Asteraceae family. They consist of about 100-120 species, primarily herbaceous perennials. They are commonly found in open areas like meadows, prairies, and savannas. While most species are native to North America, including Mexico, some are also found in South America and Eurasia. Certain American species have been introduced to Europe and other regions around the globe.

Helianthus: Helianthus is a genus of flowering plants in the Asteraceae family, consisting of about 70 species, with most native to North and Central America. The common sunflower is the most well-known species. These plants are cultivated as food crops and ornamental plants. The primary growing season for Helianthus annuus is during the summer and early fall.

Sonchus: Sonchus is a genus of flowering plants in the Asteraceae family. They are commonly called sow thistles and can be annual, biennial, or perennial herbs. Some varieties have rhizomes and a few are even woody.

Tagetes: Tagetes is a genus of flowering plants in the Asteraceae family, with around 50 species. They are mostly annual or perennial herbs and are commonly known as marigolds. The genus was classified by Carl Linnaeus in 1753.

Taraxacum: Taraxacum is a large genus of flowering plants known as dandelions. It is native to Eurasia and North America, but two commonly found species, T. officinale and T. erythrospermum, were introduced from Europe to North America. These plants thrive in temperate regions and can be found in various habitats like yards, gardens, and roadsides. They are edible in their entirety and are often referred to as dandelions. The study of this genus is called taraxacology.

Campanulaceae: Campanulaceae is a plant family in the order Asterales, with around 2400 species in 84 genera. It includes herbaceous plants, shrubs, and sometimes small trees with milky sap. Garden favorites like Campanula, Lobelia, and Platycodon belong to this family. Some species like Campanula rapunculus and Codonopsis lanceolata are used as vegetables, while others like Lobelia inflata and L. siphilitica have medicinal uses. Campanula rapunculoides can be a pest in gardens, and Legousia spp. may appear in arable fields.

Arabidopsis thaliana: Arabidopsis thaliana, also known as thale cress or arabidopsis, is a small weed plant from the mustard family. It is native to Eurasia and Africa and commonly found on roadsides and disturbed land.

Tropaeolum: Tropaeolum, also known as nasturtium, is a genus of flowering plants with about 80 species. They are annual or perennial herbs and the only genus in the Tropaeolaceae family. These plants were named by Carl Linnaeus and are called nasturtiums due to their production of an oil similar to watercress.

Cactus: A cactus is a type of plant from the Cactaceae family, with about 1,750 known species. They come in various shapes and sizes and are native to the Americas. Cacti are well adapted to dry environments and have succulent stems to store water. They have spines instead of leaves to prevent water loss and provide shade. The stems also carry out photosynthesis.

Cornus: Cornus is a genus of 30-60 woody plants in the Cornaceae family, also known as dogwoods. These plants are typically recognized by their unique flowers, fruits, and bark. Most dogwoods are deciduous trees or shrubs, but some are herbaceous perennials or evergreens. They produce inconspicuous flowers surrounded by large, white petal-like bracts or clusters of petal-bearing flowers. Dogwoods are native to temperate and boreal regions of Eurasia and North America, especially China, Japan, and the southeastern United States.

Cucurbitaceae: The Cucurbitaceae, also known as cucurbits or the gourd family, consists of around 965 species in 95 genera. Some important members of this family include squash, pumpkin, zucchini, cucumber, watermelon, and bitter melon. The common name for luffa is also luffa, while cyclanthera is commonly known as Caigua.

Diospyros: Diospyros is a diverse genus of trees and shrubs, with over 700 species. They are native to tropical regions, but a few can be found in temperate areas. Ebony trees are valued for their hard and dark timber, while persimmon trees are known for their tasty fruit. Some species have ornamental value and play a vital role in local ecosystems. Most plants in this genus have separate male and female individuals.

Ericaceae: The Ericaceae family, also known as the heath or heather family, consists of flowering plants that thrive in acidic and infertile environments. With around 4,250 known species and 124 genera, it is the 14th most species-rich family of flowering plants. Notable members include cranberries, blueberries, huckleberries, rhododendrons, and common heaths and heathers, which hold economic importance.

Rhododendron: Rhododendron is a diverse genus of about 1,024 woody plants in the heath family. With both evergreen and deciduous varieties, they are native to eastern Asia, the Himalayan region, and other parts of Asia. Some species can also be found in North America, Europe, and Australia.

Azalea: Azaleas are flowering shrubs in the Rhododendron genus, known for their vibrant blooms that last for weeks in the spring. They thrive in shaded areas near or under trees and are part of the Ericaceae family.

Impatiens: Impatiens is a diverse genus of over 1,000 flowering plant species present across the Northern Hemisphere and tropical regions. It belongs to the Balsaminaceae family, alongside the Hydrocera genus.

Primulaceae: Primulaceae, also known as the primrose family, is a group of herbaceous and woody flowering plants. It includes popular garden plants and wildflowers, with most being perennial. However, there are also annual species like the scarlet pimpernel.

Theaceae: Theaceae, or the tea family, consists of shrubs and trees like the tea plant and ornamental camellias. It contains around 7 to 40 genera, varying based on sources. Ternstroemiaceae is sometimes included within Theaceae, but it is now recognized separately in Pentaphylacaceae. Most species, though not all, are native to China and East Asia.

Camellia: Camellia is a flowering plant genus found in tropical and subtropical areas of Asia. It belongs to the family Theaceae and encompasses over 220 known species. Camellias are well-known for their ornamental, tea, and woody-oil uses and have been cultivated worldwide for centuries. Over 26,000 cultivars, with more than 51,000 registered or published names, exist to date.

Fabaceae: Fabaceae, also known as the legume family, is a significant group of flowering plants. It consists of trees, shrubs, and herbaceous plants identifiable by their legume fruit and compound, stipulate leaves. With approximately 765 genera and nearly 20,000 known species, it is the third-largest land plant family after the Orchidaceae and Asteraceae. The Fabaceae family is widely distributed and holds great agricultural importance.

Mimosa: Mimosa is a genus of plants in the legume family, with around 600 species of herbs and shrubs. They are native to the Americas, eastern Africa, the Indian subcontinent, and Indochina. The name "Mimosa" comes from the Greek word for actor or mime, referring to the sensitive leaves that mimic conscious movement.

Alder: Alder trees (genus Alnus) are part of the birch family. There are around 35 species, including trees and shrubs. They are mostly found in the north temperate zone, with a few species in Central America and the Andes. Some alder trees grow to be quite large.

Birch: Birch is a hardwood tree genus, closely related to beech-oak family, found in the Northern Hemisphere. It belongs to the family Betulaceae along with alder, hazel, and hornbeam. The genus Betula includes around 30 to 60 species, 11 of which are listed as threatened. Birch trees are short-lived pioneers and are commonly found in temperate and boreal climates.

Beech: Beech is a genus of deciduous trees found in temperate Eurasia and North America. It consists of 10 to 13 species divided into two subgenera, Engleriana and Fagus. The Engleriana subgenus, exclusive to East Asia, is characterized by low branches composed of multiple trunks and yellowish bark. On the other hand, the Fagus subgenus is well-known for its high-branching trees with tall, sturdy trunks and smooth silver-grey bark. The European beech is the most commonly cultivated species.

Oak: An oak is a hardwood tree or shrub in the beech family, known for its spirally arranged leaves with lobed edges and the acorn nut it produces. There are about 500 species of oaks distributed in the Northern Hemisphere, both deciduous and evergreen. Fossil evidence shows oak trees have been around since the Middle Eocene. The genus Quercus is divided into Old World and New World clades, although hybridization between species makes their evolutionary history challenging to determine.

Hickory: Hickory refers to trees in the Carya genus, with around 18 species. They are found in China, Indochina, India, United States, Mexico, and Canada. Hickory species are valued for their edible nuts, lumber, and woodworking materials.

Apocynaceae: Apocynaceae is a diverse family of flowering plants, including trees, shrubs, herbs, succulents, and vines. Its common name is the dogbane family, as some species were used to poison dogs. The family is widespread, with members native to tropical and subtropical regions of Europe, Asia, Africa, Australia, and the Americas. The former family Asclepiadaceae is now considered a subfamily of Apocynaceae, with a total of 348 genera. A list of Apocynaceae genera can be found for more information.

Rubiaceae: Rubiaceae is a family of flowering plants known as coffee, madder, or bedstraw family. It includes terrestrial trees, shrubs, lianas, or herbs with simple, opposite leaves and sympetalous actinomorphic flowers. With around 13,500 species in 620 genera, it is the fourth-largest angiosperm family. Rubiaceae is found worldwide, but most diverse in the tropics and subtropics. Economically important genera include Coffea (coffee), Cinchona (quinine source), and ornamental and dye plants.

Gardenia: Gardenia is a flowering plant genus in the coffee family, native to Africa, Asia, Madagascar, Pacific Islands, and Australia.

Lamiaceae: Lamiaceae, also known as the mint or sage family, consists of flowering plants noted for their aromatic qualities. This family includes widely used culinary herbs like basil, rosemary, and thyme, as well as medicinal herbs such as catnip and bee balm. Lamiaceae plants are easy to cultivate and propagate, with some species being shrubs or trees. They are also grown for decorative foliage, seeds, and edible tubers. Notably, coleus and various Salvia species are grown ornamentally.

Salvia: Salvia is a diverse genus of plants in the sage family, with around 1000 species of shrubs, perennials, and annuals. It belongs to the Mentheae tribe in the Nepetoideae subfamily. Notably, Salvia includes popular herbs such as Salvia officinalis (common sage) and Salvia rosmarinus (rosemary).

Oleaceae: Oleaceae, also known as the olive family, is a taxonomic family of flowering shrubs, trees, and lianas. It consists of 28 genera, with one recently extinct. The family is globally distributed, from the subarctic to the southernmost parts of Africa, Australia, and South America. Notable plants include olives, ashes, jasmine, and popular ornamental plants like privet and lilac. There are around 700 species in the family, and the flowers are often abundant and highly fragrant.

Fraxinus: Fraxinus, known as ash, is a genus of deciduous and evergreen trees in the olive and lilac family. It consists of 45-65 species and is found widely across Europe, Asia, and North America.

Sesame: Sesame, a plant also known as benne or gingelly, is cultivated worldwide for its edible seeds. It is naturalized in tropical regions and has wild relatives in Africa and India. In 2018, global production reached 6 million metric tons, with Sudan, Myanmar, and India as the main producers.

Verbena: Verbena, also called vervain or verveine, is a genus of flowering plants in the family Verbenaceae. It comprises around 150 species of herbaceous or semi-woody plants that can be annual or perennial. Most of these plants are native to the Americas and Asia. However, the type species, Verbena officinalis, also known as common vervain or common verbena, is native to Europe.

Euphorbiaceae: Euphorbiaceae, or the spurge family, is a large family of flowering plants known as euphorbias. They include herbs, shrubs, and trees like Hevea brasiliensis. Some, like Euphorbia canariensis, resemble cacti due to convergent evolution. This cosmopolitan family has the highest species diversity in the tropics but is also found in nontropical regions on all continents except Antarctica.

Flax: Flax is a flowering plant, Linum usitatissimum, cultivated for food and fiber in temperate climates. Its fibers are used to create linen textiles and its oil is known as linseed oil. Flax was domesticated from the wild species Linum bienne and is grown worldwide. In New Zealand, plants called "flax" belong to the genus Phormium.

Hypericum: Hypericum is a widespread genus of flowering plants in the Hypericaceae family, found worldwide except in tropical lowlands, deserts, and polar regions. Some Hypericum species are invasive and considered as noxious weeds. They are commonly known as St. John's wort, with some also called goatweed. The marsh St. John's worts in North America and eastern Asia are grouped under the genus Triadenum Raf.

Poinsettia: The poinsettia is a flowering plant from Mexico and Central America, known for its red and green foliage. It was introduced to the US by Joel Roberts Poinsett in the 1820s. Poinsettias are commonly used in Christmas floral displays. They are not dangerous to pets or children, although consuming them may cause nausea, vomiting, or diarrhea.

Viola(plant): Viola is a large genus of flowering plants in the Violaceae family, consisting of over 680 species. The majority of these species are located in the temperate Northern Hemisphere, while others can be found in diverse regions like Hawaii, Australasia, and the Andes.

Willow: Willows, also known as sallows and osiers, are a diverse group of around 350 deciduous trees and shrubs. They are predominantly found in cold and temperate regions, thriving in moist soils.

Malvaceae: Malvaceae, or the mallows, is a family of flowering plants with around 244 genera and over 4,225 known species. Notable members include economically important plants like okra, cotton, cacao, roselle, and durian. Some genera, such as Alcea, Malva, and Tilia, contain popular ornamentals. Hibiscus, Pavonia, Sida, Ayenia, Dombeya, and Sterculia are among the genera with the highest numbers of species.

Adansonia: Adansonia is a genus of eight baobab tree species native to Madagascar, Africa, and Australia. They are known for their longevity and large, short-lived flowers that bloom rapidly at dusk. The baobab's fruits are large, oval to round, and contain kidney-shaped seeds encased in a dry, pulpy matrix. The trees are also called "upside-down trees" due to myths surrounding their unique appearance.

Henna: Henna is a dye made from the plant Lawsonia inermis. It is derived from the henna tree, also known as mignonette tree and Egyptian privet. Henna is one of the two species in the Lawsonia genus, the other being Lawsonia odorata.

Melastomataceae: Melastomataceae is a diverse family of flowering plants with over 175 genera and 5115 known species. Found in the tropics, they include annual or perennial herbs, shrubs, and small trees.

Myrtaceae: Myrtaceae is a family of dicotyledonous plants in the order Myrtales. Notable members include myrtle, pōhutukawa, bay rum tree, clove, guava, acca (feijoa), allspice, and eucalyptus. All species in this family are woody, have essential oils, and their flower parts come in multiples of four or five. The leaves are evergreen, simple, and usually alternate or mostly opposite. The flowers have five petals, but some genera have minute or absent petals. The stamens are numerous, brightly colored, and noticeable.

Eucalyptus: Eucalyptus is a large genus of over 700 flowering plants in the family Myrtaceae. Most are trees or shrubs known as eucalypts. They have distinct bark, oil glands in their leaves, and unique fruit capsules called "gumnuts". Eucalyptus is part of a tribe that includes Corymbia and Angophora.

Proteaceae: Proteaceae is a family of flowering plants found mainly in the Southern Hemisphere. It consists of 83 genera and around 1,660 known species. Australia and South Africa have the highest diversity of these plants. The family is part of the order Proteales, along with Platanaceae, Nelumbonaceae, and Sabiaceae. Well-known genera within Proteaceae include Protea, Banksia, Embothrium, Grevillea, Hakea, and Macadamia. Some popular cut flowers from this family include the New South Wales waratah, king protea, and various Banksia, Grevillea, and Leucadendron species. Macadamia nuts are widely cultivated and consumed, along with the lesser-known Gevuina avellana nuts.

Nelumbo: Nelumbo is a genus of aquatic plants with large, showy flowers, commonly called lotus. Although they resemble plants in the Nymphaeaceae family, Nelumbo is actually unrelated.

Platanus: Platanus is a small genus of trees native to the Northern Hemisphere. It is the only living member of the Platanaceae family.

Cannabis: Cannabis is a flowering plant in the Cannabaceae family and its genus includes species like Cannabis sativa, C. indica, and C. ruderalis. The number of species is debated, but they are often treated as subspecies or variations of C. sativa. Cannabis is believed to originate from Asia and is well-known for its psychoactive properties.

Moraceae: The Moraceae, also known as the mulberry family or fig family, consists of over 1100 species belonging to about 38 genera. They are mainly found in tropical and subtropical regions but can be found worldwide. The family's key characteristic is the presence of laticifers and milky sap in all parenchymatous tissues. Other notable features include inconspicuous compound flowers and fruits. Well-known examples within the family include figs, banyans, breadfruit, jackfruit, mulberries, and Osage oranges. Pseudanthia, or false flowers, are common among Moraceae.

Ficus sycomorus: Ficus sycomorus is a cultivated fig species, also known as the sycamore fig. It has been grown since ancient times.

Rosaceae: Rosaceae, or the rose family, comprises 4,828 species in 91 genera. It is a medium-sized family of flowering plants.

Rose: A rose is a perennial flowering plant that belongs to the genus Rosa in the family Rosaceae. It can be either a woody shrub or a climbing/trailing plant, armed with prickles. There are over 300 species and numerous cultivars, with flowers varying in size, shape, and color. Most species are native to Asia, while some are found in Europe, North America, and northwestern Africa. Roses are valued for their beauty, fragrance, and cultural significance. They range in size from miniature to tall climbers and are often used for hybridization in creating garden roses.

Elm: Elms are deciduous trees in the Ulmaceae family found in the Northern Hemisphere. They are distributed across temperate and tropical-montane regions of North America and Eurasia, stretching down to the Middle East, Lebanon, and Israel. They also extend across the Equator into Indonesia.

Maple: Maple is a genus of trees and shrubs, belonging to the soapberry family. There are around 132 species, mostly found in Asia, with some in Europe, Africa, and North America. The sycamore maple is the common species in Europe. The distinguishing features of maples are palmate leaves and winged fruits. They are closely related to horse chestnuts. Maple syrup is extracted from the sap of certain species, and they are widely grown for their autumn color in gardens.

Mahogany: Mahogany is a reddish-brown timber from three tropical hardwood species. It is prized for its durability and coloring, making it widely used for various products. Originally native to the Americas, it has also been cultivated in Asia and Oceania. The mahogany trade dates back to the 16th century and thrived in the 17th and 18th centuries. In some places, it is considered an invasive species.

Convolvulaceae: The Convolvulaceae family, called bindweeds or morning glories, consists of over 1,650 species across 60 genera. They are mainly herbaceous vines, but also include trees, shrubs, and herbs. Notably, some species have edible tubers, with the sweet potato being the most well-known.

Apple: An apple is a round, edible fruit that grows on apple trees, which are widely cultivated worldwide. It originated in Central Asia and has a wild ancestor still found there. Apples have been grown for thousands of years in Asia, Europe, and North America. They hold religious and mythological importance in various cultures, including Norse, Greek, and European Christian traditions.

Pear: Pears are globally grown and popular fruits harvested in late summer to mid-autumn. They come from the pear tree, a species in the Pyrus genus of the Rosaceae family. Known for their delicious edible fruit and juices, some pear species are also cultivated as trees.

Apricot: An apricot is a fruit from the Prunus genus, known for its delicious taste and associations with several species of trees.

Cherry: A cherry is a fleshy drupe fruit from the genus Prunus.

Lychee: Lychee is a fruit belonging to the soapberry family. It is the only species in the Litchi genus.

Mango: The mango is an edible stone fruit grown from a tropical tree called Mangifera indica. It originated from the region between northwestern Myanmar, Bangladesh, and northeastern India. The cultivation of mangoes dates back to ancient times in South and Southeast Asia, resulting in two main types of modern cultivars: the "Indian type" and the "Southeast Asian type." Additionally, other species within the Mangifera genus also produce edible fruits known as mangoes, most of which are found in the Malesian ecoregion.

Peach: The peach is a tree originally from Eastern China, known for producing juicy and edible fruits called peaches. It is cultivated in Zhejiang province and also yields nectarines, a similar fruit with slight differences in appearance and taste.

Plum: Plums are fruits of the Prunus subg. Prunus species. They can be dried and known as prunes, but in the US they are sometimes labeled as 'dried plums'.

Blackberry: A blackberry is an edible fruit found across various species in the genus Rubus within the Rosaceae family. The taxonomy of blackberries has been historically complicated due to hybridization and apomixis, leading to species aggregates. For instance, the subgenus Rubus is often referred to as the Rubus fruticosus aggregate, despite R. fruticosus being synonymous with R. plicatus.

Blackcurrant: Blackcurrant, also called cassis, is a shrub with edible berries. It grows in temperate regions of Europe and Asia, favoring damp fertile soils. The plant is widely cultivated for commercial and domestic use.

Blueberry: Blueberries are perennial flowering plants with blue or purple berries. They belong to the Vaccinium genus alongside cranberries, bilberries, huckleberries, and Madeira blueberries. Native to North America, commercial varieties of blueberries are widely distributed and include both wild and cultivated species. Highbush blueberries were introduced into Europe in the 1930s.

Cranberry: Cranberries are evergreen shrubs or trailing vines. In Britain, they refer to Vaccinium oxycoccos, while in North America, they refer to Vaccinium macrocarpon. The former is cultivated in Europe, while the latter is cultivated in the United States, Canada, and Chile. Oxycoccus is sometimes considered its own genus. Cranberries thrive in acidic bogs in cooler regions of the Northern Hemisphere.

Grape: Grapes are berries from Vitis vines, known for growing in clusters. They are non-climacteric fruits.

Kiwifruit: Kiwifruit, also known as Chinese gooseberry, is a berry that comes from woody vines in the Actinidia genus. The most common variety is oval-shaped, similar in size to a hen's egg. It has a thin, fuzzy, tart but edible light brown skin, and light green or golden flesh with tiny black seeds. The fruit has a soft texture and a distinct sweet flavor.

Raspberry: Raspberries are edible fruits from various plants in the Rubus genus, mostly in the subgenus Idaeobatus. They are perennial with woody stems.

Strawberry: The garden strawberry is a popular fruit known for its aroma, bright red color, juicy texture, and sweetness. It is widely cultivated worldwide and consumed fresh or in various prepared foods like jam, pies, and ice cream. Artificial strawberry flavorings are also commonly used in candies, soaps, and perfumes.

Citrus: Citrus is a genus of flowering trees and shrubs that produce citrus fruits, including oranges, lemons, grapefruits, pomelos, and limes. Native to South Asia, East Asia, Southeast Asia, Melanesia, and Australia, citrus species have been cultivated and used by indigenous cultures for thousands of years. They were later spread to Micronesia, Polynesia, the Middle East, the Mediterranean, Europe, and the Americas through trade routes and expansions.

Grapefruit: The grapefruit is a citrus tree with large, sour to semi-sweet fruit. Its segmented flesh ranges in color from pale yellow to dark pink/red.

Kumquat: Kumquats, also known as cumquats in Australian English, are small fruit-bearing trees in the Rutaceae family. Their classification has been disputed, previously considered part of the Fortunella genus or within the broader Citrus classification. Recent genomic analysis identifies three pure species: Citrus hindsii, C. margarita, and C. crassifolia, with C. x japonica being a hybrid of the last two.

Lemon: The lemon is a small evergreen tree, belonging to the Rutaceae family. It is native to Asia, particularly Northeast India, Northern Myanmar, and China.

Lime (fruit): A lime is a citrus fruit known for its acidic juice and round, green appearance. It is typically 3-6 centimeters in diameter, packed with juice vesicles.

Orange (fruit): An orange is a sweet citrus fruit from the Rutaceae family, primarily referred to as Citrus × sinensis. It is distinct from the bitter orange, known as Citrus × aurantium.

Mandarin orange: The mandarin orange is a small citrus fruit, often eaten plain or in fruit salads. It is part of a distinct species of orange and is also known as mandarin or mandarine. Tangerines are a group of orange-colored citrus fruits that are hybrids of mandarin oranges with some pomelo contribution.

Cucumis melo: 'Cucumis melo', commonly known as melon, is a cultivated fruit with various varieties. It is a pepo with either sweet or bland flesh, occasionally with a musky aroma. The rind can be smooth, ribbed, wrinkled, or netted. In North America, the sweet-flesh varieties are collectively called muskmelon, which includes the musky netted-rind and inodorous smooth-rind types. The term 'cantaloupe' generally refers to the musky netted-rind type, while the European cantaloupe has ribbed and often warty rind that is less common in North America.

Watermelon: Watermelon, a flowering plant of the Cucurbitaceae family, produces an edible fruit. It is a globally popular and extensively grown fruit with over 1,000 varieties.

Banana: A banana is an elongated, edible fruit produced by herbaceous plants in the Musa genus. It is typically curved and varies in size, color, and firmness. Bananas used for cooking are called "plantains." They grow in clusters near the top of the plant and come in different colors when ripe. Most modern edible bananas come from two wild species. The scientific names for cultivated bananas depend on their genomic constitution. The old scientific name, Musa sapientum, is no longer used.

Cooking banana: Cooking bananas are starchy fruits used in cooking that can be eaten ripe or unripe. They are often called plantains or green bananas, with true plantains belonging to the AAB group and other starchy varieties referred to as cooking bananas. These cultivars fall into the AAB, AAA, ABB, or BBB groups under the scientific name Musa × paradisiaca. Fe'i bananas, known as "mountain plantains," are consumed roasted or boiled but do not originate from the species that modern banana cultivars descend from.

Coconut: The coconut is a drupe and the only living species in its genus. It is part of the palm tree family and has three indentations on its shell, resembling a head. Coconuts are found in coastal tropical regions and are seen as a cultural symbol of the tropics.

Durian: Durian is an edible fruit of the Durio tree genus, with 30 recognized species and at least nine producing edible fruit. Durio zibethinus is the only species available internationally, while other species are sold locally. It has numerous named varieties in Thailand and Malaysia.

Fig: The fig is a fruit that grows on a small tree called Ficus carica. It is native to the Mediterranean region and parts of Asia. The tree has been cultivated for thousands of years and is now grown worldwide. Ficus carica is the main species in a genus that includes over 800 tropical and subtropical plants.

Guava: Guava is a tropical fruit widely grown in many tropical and subtropical regions. It belongs to the myrtle family and is native to Mexico, Central America, the Caribbean, and northern South America. In addition to the common guava, there are other species like strawberry guava and pineapple guava. India is the top producer, accounting for 45% of the global production in 2019. Botanically, guavas are classified as berries.

Jackfruit: The jackfruit is a large fruit from the jack tree, belonging to the fig, mulberry, and breadfruit family. It can grow up to 55 kg, 90 cm long, and 50 cm in diameter. A mature jackfruit tree produces around 200 fruits annually, with some older trees yielding up to 500 fruits. This fruit is a combination of many flowers, and its unripe fleshy petals are edible.

Papaya: The papaya is a tropical plant native to Mesoamerica and belonging to the Caricaceae family. It is cultivated in various countries with tropical climates. In 2020, India accounted for 42% of the global papaya production.

Pineapple: The pineapple is a tropical plant in the family Bromeliaceae, known for its economically significant edible fruit.

Pomegranate: The pomegranate is a fruit-bearing deciduous shrub that grows up to 10 m tall. It is known for its rich symbolic and mythological associations in various cultures.

Tamarind: Tamarind is a tropical fruit tree found in Africa and Asia. It is the only species in its genus, Tamarindus, and belongs to the Fabaceae family.

Avocado: The avocado is a medium-sized evergreen tree native to the Americas. It was domesticated in Mesoamerica over 5,000 years ago and prized for its oily fruit. Avocado trees likely originated in the highlands of Mexico and Guatemala. The fruit is a large berry with a single seed, also known as an alligator pear or avocado pear. Avocados have a hybrid origin and their evolution was influenced by polyploidy events. They are partly self-pollinating and often propagated through grafting. Avocados are cultivated in tropical and Mediterranean climates worldwide, with Mexico being the leading producer, supplying nearly 30% of the global harvest in 2020.

Date palm: The date palm, scientifically known as Phoenix dactylifera, is a popular plant cultivated for its sweet edible fruit called dates. It belongs to the palm family and is widely grown in northern Africa, the Middle East, and South Asia, with naturalized populations found in tropical and subtropical regions globally. P. dactylifera is the main species among the 12-19 wild date palm varieties found in the genus Phoenix.

Morus(plant): Morus is a genus of flowering plants in the family Moraceae, including diverse deciduous trees known as mulberries. There are three well-known species: white, red, and black mulberry, with various cultivars. Native to South Asia, the white mulberry is widely distributed across Europe, Southern Africa, South America, and North America. It is also favored by silkworms and considered invasive in Brazil and the United States.

Olive: The olive is a small tree or shrub found in the Mediterranean Basin, known as Olea europaea. It is also called the European olive. The species is cultivated in various countries including the Mediterranean region, Australia, New Zealand, North and South America and South Africa. The olive tree is the type species for its genus, Olea, and it belongs to the Oleaceae plant family. This family also includes other species like lilac, jasmine, forsythia, and the true ash tree.

Bell pepper: Bell peppers, classified as fruits but used as vegetables, are the diverse and colorful fruits of the Capsicum annuum plant. They come in various hues such as red, yellow, orange, green, white, chocolate, candy cane striped, and purple. Often referred to as "sweet peppers," they are distinct from pungent chili peppers. Cultivated primarily for their mild flavor, they make a frequent appearance in savory dishes and are known for their versatility.

Breadfruit: Breadfruit is a flowering tree believed to have originated in New Guinea, the Maluku Islands, and the Philippines. It was brought to Oceania during the Austronesian expansion and later spread to other tropical regions during the Colonial Era. British and French navigators introduced seedless varieties to the Caribbean in the late 18th century. Today, it is grown in 90 countries across South and Southeast Asia, the Pacific Ocean, the Caribbean, Central America, and Africa. The fruit's name comes from its texture after cooking, resembling freshly baked bread and having a potato-like taste.

Chili pepper: Chili peppers are spicy berry-fruits from the Capsicum genus, used in various cuisines worldwide. They belong to the nightshade family and are known for their pungency. Capsaicin and capsaicinoids provide the intense flavor when consumed or applied topically. Chili peppers offer a diverse range of heat and flavors, leading to the creation of different paprika and chili powder varieties with distinctive tastes and spice levels.

Cucumber: A cucumber is a crawling vine plant that produces cylindrical or spherical fruits used for cooking. It is cultivated worldwide and classified into three main types: slicing, pickling, and seedless, with numerous varieties within each type. Originally from Asia, it now grows on most continents and is commercially traded globally. In North America, the term "wild cucumber" refers to unrelated plants in the genera Echinocystis and Marah.

Cucurbita: Cucurbita is a genus of herbaceous fruits, native to the Andes and Mesoamerica. Five edible species are cultivated for their flesh and seeds, known as squash, pumpkin, or gourd depending on species. Cucurbita belongs to the gourd family.

Zucchini: Zucchini, also known as courgette or baby marrow, is a type of summer squash. It comes from a vining plant, and its fruits are picked when the seeds and rind are still tender and edible. Although similar to marrow, zucchini is distinct and has mature fruits known as marrow.

Pumpkin: A pumpkin is a type of winter squash in the genus Cucurbita, commonly characterized by its round shape and orange color. While lacking a scientific definition, the term "pumpkin" is often used to refer to various squashes with different appearances.

Eggplant: Eggplant, also known as aubergine, brinjal, or baigan (GY), is a widely cultivated plant in the nightshade family Solanaceae. Its scientific name is Solanum melongena. This plant is primarily grown for its edible fruit, which is enjoyed worldwide.

Green bean: Green beans are the young, unripe fruits of several bean cultivars. They are also called French beans, string beans, or snap beans. They can be used similarly to immature pods of runner beans, yardlong beans, and hyacinth beans. In the Philippines, they are known as "Baguio beans" or "habichuelas" to differentiate them from yardlong beans.

Okra: Okra, or Abelmoschus esculentus, is a flowering plant native to East Africa. It is also known as lady's fingers. The plant produces edible green seed pods. Okra is cultivated in tropical, subtropical, and warm temperate regions worldwide and is used in the cuisines of multiple countries.

Tomato: The tomato is an edible berry from the tomato plant. It originated in South America and was domesticated by indigenous peoples in Mexico. The Aztecs used tomatoes in their cooking, and the Spanish brought the plant to Europe during the Columbian exchange. The tomato was then introduced to other parts of the European-colonized world during the 16th century.

Barley: Barley is a cereal grain that belongs to the grass family and is grown in temperate climates worldwide. It was one of the first cultivated grains and was domesticated around 9,000 BC, making harvesting easier. Barley spread throughout Eurasia by 2,000 BC. It thrives in cooler temperatures and well-drained soil, while also being relatively resilient to drought and soil salinity. However, it is less winter-hardy compared to wheat or rye.

Maize: Maize, commonly known as corn, is a tall grass that produces cereal grain. It was domesticated in southern Mexico 9,000 years ago. Native Americans cultivated it in the Three Sisters polyculture with beans and squashes. Maize has male tassels that produce pollen and female ears that yield kernels. Modern varieties are usually yellow or white, but other colors exist.

Millet: Millets are small-seeded grasses cultivated globally as cereal crops and for fodder and human consumption. They belong to the tribe Paniceae, although some millets are part of other taxa.

Oat: Oats, a common cereal grain, are valued for their seeds known by the same name. They are consumed as oatmeal and rolled oats, rich in nutrients and linked to lower cholesterol and decreased heart disease risk. Oats are also widely utilized as livestock feed.

Rice: Rice is a cereal grain that is the main food source for over half of the world's population, predominantly in Asia and Africa. It originated in China and Africa thousands of years ago. In 2021, 787 million tons of rice were produced, making it the fourth most cultivated crop globally. China, India, and Indonesia are the largest rice consumers. Losses occur after harvest due to poor transportation and storage. Pests, diseases, and weeds can harm rice yields, but sustainable practices like rice-duck farming and integrated pest management help manage these issues.

Oryza sativa: Oryza sativa, commonly known as rice, is a globally prevalent crop. It originated in China around 13,500 to 8,200 years ago in the Yangtze River basin.

Rye: Rye is a versatile grain that is cultivated as a grain, cover crop, and forage crop. It belongs to the wheat tribe and shares similarities with wheat and barley. Rye grain is used to make flour, bread, beer, crispbread, whiskeys, and vodkas, while also serving as fodder for animals. It can be consumed whole, either boiled or rolled like oats.

Sorghum: Sorghum, a genus of flowering plants in the grass family, includes around 25 species. Some are cultivated as cereals or animal fodder, while others provide bristles for brooms. Sorghum grain is highly nutritious, containing protein, dietary fiber, B vitamins, and minerals such as.

Wheat: Wheat is a widely cultivated grass known for its cereal grain, which is a common staple food worldwide. It belongs to the genus Triticum, with common wheat being the most popular species. Archaeological evidence points to its cultivation beginning around 9600 BC in the Fertile Crescent region. Botanically, the wheat kernel is classified as a caryopsis, a type of fruit.

Common wheat: Common wheat, also known as bread wheat, is a highly cultivated wheat species that accounts for 95% of global wheat production. It is the most extensively grown crop and has the highest monetary yield among cereals.

Amaranth: Amaranth is a diverse genus of plants that includes both annual and perennial varieties. It is cultivated for its edible leaves, seeds, and for ornamental use. The flowers grow densely in catkin-like clusters during summer or fall, displaying a range of vibrant colors. With over 75 species, amaranth is found across the globe, from North America to the Himalayas. The stems are tall and succulent, reaching 1 to 2.5 meters in height. Amaranth shares similarities with the related genus Celosia, and its grains are used for collection. Some species' leaves are also consumed as a food source.

Buckwheat: Buckwheat is a flowering plant grown for its grain-like seeds and as a cover crop. It belongs to the knotweed family Polygonaceae. The term 'buckwheat' is also used for other species, including Fagopyrum tataricum, a cultivated food plant primarily found in Asia.

Quinoa: Quinoa is a flowering plant grown primarily for its edible seeds, which are rich in protein, dietary fiber, B vitamins, and minerals. It is not a grass but a pseudocereal related to spinach and amaranth. Quinoa originated in the Andean region of South America and has been used for feeding livestock for thousands of years. It has been a staple food for human consumption for thousands of years as well, particularly in Peru and Bolivia.

Almond: The almond is a small tree cultivated globally for its culinary nut. It belongs to the genus Prunus and is part of the subgenus Amygdalus, distinguishable by the corrugations on its shell.

Brazil nut: The Brazil nut is a South American tree in the Lecythidaceae family. It produces large, long-lived trees and commercially harvested edible seeds. The Brazil nut is notable for its high selenium content and diverse micronutrients. The tree's wood is valued for its quality in various carpentry and construction applications.

Cashew: The cashew is a tropical tree from South America that produces cashew seeds and apples. It can grow up to 14 meters tall but dwarf cultivars are more profitable. The seed is a snack nut and can be used in recipes, processed into cashew cheese or butter. Cashew allergies are caused by proteins in tree nuts and cooking doesn't remove them.

Chestnut: Chestnuts are deciduous trees and shrubs in the Castanea genus, known for producing edible nuts. They belong to the beech family and are found in temperate regions of the Northern Hemisphere.

Hazelnut: The hazelnut, derived from the hazel tree, refers to any nuts from the Corylus genus, mainly Corylus avellana. They are often called cobnuts or filberts, depending on the species.

Macadamia: Macadamia is a genus of four trees native to Australia, with two species commercially important for their fruit, the macadamia nut. Also known as Queensland nut or bush nut, they were a significant food source for Aboriginal peoples. Global production in 2015 reached 160,000 tonnes.

Pecan: The pecan is a type of hickory tree found in the southern US and northern Mexico near the Mississippi River.

Walnut: A walnut is the edible seed of a tree from the genus Juglans, like the Persian or English walnut. It is a drupe-like nut, with an outer covering that is not part of the carpel.

Bean: Beans are seeds from the Fabaceae family, commonly eaten worldwide. They're versatile and can be cooked through boiling, frying, or baking. Used as vegetables for both human and animal food, beans are essential ingredients in various traditional dishes.

Lentil: The lentil is an edible legume with lens-shaped seeds. It is an annual plant that grows about 40 cm tall and produces pods containing two seeds each. Canada and India are the top global producers of lentils, accounting for 29% and 27% of the world's total lentil production in 2021.

Lima bean: The Lima bean, also called butter bean or sieva bean, is a legume known for its edible seeds. It is commonly grown for its beans.

Phaseolus vulgaris: Phaseolus vulgaris, commonly known as the common bean, is a versatile annual plant cultivated globally for its edible dry seeds and green pods. It is also used for its leaf as a vegetable and straw as fodder. Belonging to the Fabaceae family, like other Phaseolus species, common beans have a symbiotic relationship with nitrogen-fixing bacteria called rhizobia, enabling them to obtain the necessary nitrogen.

Soybean: The soybean, also known as soy or soya, is a legume native to East Asia. It is extensively cultivated for its versatile and edible beans that serve various purposes.

Vicia faba: Vicia faba, commonly known as broad bean or fava bean, is a flowering plant cultivated as a crop for human consumption and as a cover crop. It belongs to the pea and bean family Fabaceae. This legume is widely grown in Southern European, Northern European, East Asian, Latin American, and North African cuisines. It has smaller, harder seeds that are sometimes used as feed for horses and other animals, known as field bean or tic bean. The horse bean, a variety of Vicia faba, is recognized as an accepted name.

Chickpea: The chickpea, an annual legume, belongs to the family Fabaceae and is known by different names. Its seeds are rich in protein and it is one of the oldest cultivated legumes, with archaeological evidence found in Syria.

Pea: Pea is a versatile plant species that can be consumed as a pulse, vegetable, or fodder crop. It mainly refers to the seed or pod of the plant, formerly known as Pisum sativum and now renamed Lathyrus oleraceus. Pea pods are technically fruit, as they develop from the ovary of a pea flower and contain multiple seeds (peas). The term "pea" is also used for other edible seeds from the Fabaceae family, such as pigeon peas and cowpeas. Additionally, it can be used as a compound form, like Sturt's desert pea.

Peanut: The peanut, also known as the groundnut, is a legume crop grown for its edible seeds. It is widely cultivated in the tropics and subtropics for small and large commercial purposes. With its high oil content, peanuts are classified as both a grain legume and an oil crop. China leads global production, accounting for 38% of shelled peanuts in 2016. Unlike most legumes, peanut pods grow underground, leading to its specific epithet "hypogaea" meaning "under the earth."

Cabbage: Cabbage is a leafy green or purple vegetable, grown as an annual crop for its dense heads. It is a cultivar of Brassica oleracea and belongs to the "cole crops" group, closely related to broccoli, cauliflower, Brussels sprouts, and Savoy cabbage.

Chard: Chard, also known as Swiss chard, is a leafy vegetable with large stalks and separate leaf blades. It belongs to the Flavescens Group, where stalks are commonly prepared separately. The Cicla Group refers to leafy spinach beet. Chard has green or reddish blades and white, yellow or red stalks.

Chinese cabbage: Chinese cabbage refers to two cultivar groups of leaf vegetables commonly used in Chinese cuisine: the Pekinensis Group and the Chinensis Group.

Collard (plant): Collard is a loose-leafed cultivar of Brassica oleracea, belonging to the same species as cabbage and broccoli. It is categorized under the Acephala cultivar group and has its own variety called Brassica oleracea var. viridis. "Collard" originates from the term "colewort."

Eruca vesicaria: Eruca vesicaria, also known as rocket or arugula, is an annual plant in the Brassicaceae family. It is used as a leaf vegetable and is valued for its fresh, tart, bitter, and peppery taste. This plant, native to the Mediterranean region, is commonly referred to as "garden rocket" and has various other names like "colewort," "roquette," "ruchetta," "rucola," "rucoli," and "rugula." It is highly popular as a salad vegetable.

Kale: Kale, known as leaf cabbage, is a group of cabbage varieties cultivated for its edible leaves. Some are grown for ornamental purposes. Kale plants have green or purple non-head-forming leaves. They are closer to wild cabbage and are derived from wild mustard.

Lettuce: Lettuce is a leafy vegetable from the Asteraceae family. It is commonly used in salads and other dishes like soups, sandwiches, wraps, and grilled preparations. Some varieties, like celtuce, are grown for their edible stems. Lettuce holds cultural, culinary, and medicinal significance globally. Originally popular in Europe and North America, lettuce consumption has now spread worldwide. In 2021, lettuce and chicory production reached 27 million tonnes, with China accounting for 53 percent of the total.

Rapeseed: Rapeseed, or oilseed rape, is a yellow-flowering plant cultivated for its oil-rich seed containing erucic acid. Canola refers to low erucic acid rapeseed varieties prized for food use. Rapeseed is a major source of vegetable oil and protein meal globally.

Spinach: Spinach is a leafy green plant found in central and Western Asia, commonly used as a vegetable. It can be eaten fresh or preserved through canning, freezing, or dehydration. The taste varies, and it can be consumed cooked or raw. Steaming helps reduce its high oxalate content.

Arrowroot: Arrowroot is a tropical plant starch derived from rhizomes like Maranta arundinacea, Zamia integrifolia, and cassava. It is also known as tapioca or labeled as arrowroot. Polynesian arrowroot (pia) and Japanese arrowroot (kudzu) have similar uses. In India, it is called palua.

Beetroot: The beetroot, or beets, is a taproot vegetable known by different names in North America and British English. It is also called table beet, garden beet, red beet, dinner beet or golden beet.

Carrot: The carrot is a root vegetable that is typically orange in color, but can also be purple, black, red, white, or yellow. It is a domesticated form of the wild carrot, native to Europe and Southwestern Asia. Carrots were originally cultivated for their leaves and seeds. The most commonly consumed part is the taproot, which has been selectively bred to be larger, tastier, and less woody-textured.

Cassava: Cassava, also known as manioc or yuca, is a woody shrub native to South America. It is cultivated as an annual crop in tropical regions for its starchy root tuber, which is a major source of carbohydrates. Cassava is boiled and eaten, but also used to extract tapioca starch for food, animal feed, and industrial purposes. Farinha in Brazil and garri in West Africa are edible flours made from grated, dried cassava pulp.

Onion: The onion is a widely cultivated vegetable and the main species in the Allium genus. It is also known as the bulb onion or common onion. The shallot is a variety of onion that was considered a separate species until 2011. It is closely related to garlic, scallion, leek, and chive.

Parsnip: The parsnip is a root vegetable closely related to carrot and parsley. It has a cream-colored skin and flesh with a long taproot. It is usually grown as an annual but is biennial. The plant has green leaves in the first year and produces small yellow flowers in the second year. The stem becomes woody and the tap root inedible. Handling the stems and foliage can cause a skin rash or blindness if exposed to sunlight.

Potato: The potato is a starchy vegetable consumed worldwide as a staple food. It is a tuber of the Solanum tuberosum plant, belonging to the Solanaceae family.

Radish: The radish is an edible root vegetable domesticated in Asia before Roman times, belonging to the mustard family.

Daikon: Daikon, also known as mooli, is a winter radish with fast-growing leaves and a long, white, napiform root. Native to East Asia, it is widely consumed in the region, including South Asia, and is available worldwide. It is also planted in certain areas to improve soil quality and nutrient recovery.

Rutabaga: Rutabaga, also known as swede or Swedish turnip, is a root vegetable belonging to the Brassica napus species. The roots are consumed as food and can be prepared in various ways, while the leaves can be eaten as a leafy vegetable. Rutabaga is distinct from the white turnip, and it originated as a hybrid between cabbage and turnip. It is commonly utilized as livestock feed during winter or foraged in the field throughout other seasons. Moreover, carving rutabaga roots into Jack-o'-lanterns on Halloween is a tradition in Scotland, Northern and Western England, Wales, the Isle of Man, and Ireland.

Sugar beet: A sugar beet is a commercially grown plant with a high sucrose content in its root. It is part of the Altissima cultivar group of the common beet, classified as var. saccharifera. Its closest wild relative is the sea beet.

Sweet potato: The sweet potato is a plant with starchy, sweet-tasting tuberous roots that are used as a root vegetable. It belongs to the Convolvulaceae family and is not closely related to common potatoes. The plant produces cultivars with tubers of different colors, and its young shoots and leaves can also be eaten. Despite the name, sweet potatoes are not true yams, which are a different plant species.

Taro: Taro is a widely grown root vegetable, used for its corms, leaves, stems and petioles. It serves as a food staple in diverse cultures, including African, Oceanic, East Asian, Southeast Asian, and South Asian. Considered one of the earliest cultivated plants.

Turnip: The turnip is a root vegetable with a white, fleshy taproot. It is commonly grown worldwide for human consumption and as feed for livestock. In some regions, the term "turnip" is also used to refer to rutabaga, a larger yellow root vegetable.

Yam (vegetable): Yam refers to certain edible tubers grown by plants in the Dioscorea genus.

Artichoke: The artichoke is a type of thistle that is cultivated as a food. It is also known as the globe artichoke, French artichoke, and green artichoke in the U.S.

Asparagus: Asparagus is a plant species from Eurasia, cultivated as a vegetable crop. Its young shoots are popularly consumed as a spring vegetable.

Broccoli: Broccoli is a green vegetable in the cabbage family, known for its large flower heads and thick stalk. It belongs to the Italica cultivar group of the species Brassica oleracea. The flower heads are usually dark green and arranged in a tree-like structure. Surrounding the flower heads are leaves. Although similar to cauliflower, broccoli is a different cultivar group of the same Brassica species.

Cauliflower: Cauliflower is a vegetable from the Brassica oleracea species, characterized by its annual growth and seed reproduction. It is known for its white, edible head, also called "curd," which is made up of a white inflorescence meristem. Cauliflower is a close relative of broccoli and other "cole" crops like cabbage and kale.

Celery: Celery is a vegetable in the family Apiaceae, cultivated for centuries. Its long fibrous stalks, leaves, and hypocotyl are used in cooking. The plant is found in marshlands and its seed powder is used as a spice.

Chicory: Chicory is a perennial herb with woody stems and bright blue flowers, occasionally white or pink. It belongs to the Asteraceae family and is originally from the Old World. It has been cultivated in the Americas and Australia as well.

Kohlrabi: Kohlrabi is a biennial vegetable, also known as German turnip or turnip cabbage. It is a stout cultivar of wild cabbage and belongs to the same species as broccoli, cauliflower, kale, Brussels sprouts, and other leafy greens.

Leek: The leek is a vegetable that belongs to the Allium genus, along with onions, garlic, and other related plants. It is a cultivar of Allium ampeloprasum, commonly known as the broadleaf wild leek. The edible part of the leek is a bundle of leaf sheaths, often mistaken for a stem or stalk. There are three closely related vegetables, including elephant garlic, kurrat, and Persian leek or tareh, which are also cultivars of A. ampeloprasum but differ in their culinary uses.

Anise: Anise, also known as aniseed, is a flowering plant from the Apiaceae family. It is native to the eastern Mediterranean region and Southwest Asia.

Basil: Basil, or great basil, is a tender culinary herb used worldwide. It belongs to the Lamiaceae family and is commonly known as sweet basil or Genovese basil in Western cuisine. Basil is native to tropical regions from Central Africa to Southeast Asia. While treated as an annual in temperate climates, it can be a short-lived perennial or biennial in warmer horticultural zones with tropical or Mediterranean climates.

Black pepper: Black pepper is a vine cultivated for its dried fruit, used as a spice. The fruit is small, dark red, and contains a single seed. The spice can be referred to as black pepper, green pepper, or white pepper.

Cardamom: Cardamom is a spice derived from the seeds of plants in the genera Elettaria and Amomum. It is native to India and Indonesia and is characterized by small, triangular seed pods with a thin outer shell and black seeds. Elettaria pods are light green, while Amomum pods are larger and dark brown.

Cinnamon: Cinnamon is a spice derived from the inner bark of certain trees in the Cinnamomum genus. It is widely used as a condiment and flavor enhancer in a variety of dishes and foods, including cereals, teas, and snacks. The distinctive aroma and flavor of cinnamon come from its essential oil, primarily composed of cinnamaldehyde, along with other compounds like eugenol.

Clove: Cloves are the flower buds of a tree native to Indonesia, commonly used for their aromatic properties. They serve as a spice, flavoring agent, and fragrance in consumer products like toothpaste and soaps. Cloves are accessible all year round due to their harvest seasons in different countries.

Cumin: Cumin is a flowering plant found in the Irano-Turanian Region. Its dried seeds are used in cuisines worldwide. While it has traditional medicinal use, there is no strong evidence supporting its effectiveness or safety as a therapeutic agent.

Fennel: Fennel is a flowering plant in the carrot family. It has yellow flowers and feathery leaves. Originally from the Mediterranean, it has spread to various parts of the world, thriving in dry soils near the coast and riverbanks.

Garlic: Garlic is a plant in the Allium genus, closely related to onions, leeks, and shallots. It is native to South and Central Asia, and northeastern Iran. Garlic has a long history of human consumption and is used worldwide as a seasoning. It was also used by ancient Egyptians for both culinary and medicinal purposes. China is the largest producer of garlic, accounting for 73% of the global supply in 2021.

Ginger: Ginger is a versatile plant known for its rhizome, widely used as a spice and in traditional medicine. It grows up to one meter tall with narrow leaf blades and produces pale yellow flowers with purple edges from separate shoots on the rhizome.

Ginseng: Ginseng is a root found in plants of the Panax genus, including Korean, South Chinese, and American varieties. It contains ginsenosides and gintonin. Ginseng is widely used in Chinese and Korean cuisine and medicine.

Horseradish: The horseradish is a perennial plant from the Brassicaceae family. It is a spice and condiment that is cultivated globally. Native to Southeastern Europe and Western Asia.

Lavandula: Lavandula is a plant genus in the mint family with 47 known species. It is native to the Old World and can be found in various regions, including Cape Verde, the Canary Islands, Europe, northern and eastern Africa, the Mediterranean, and southwest Asia to India.

Liquorice: Liquorice, scientifically known as Glycyrrhiza glabra, is a flowering plant that belongs to the bean family Fabaceae. It is primarily cultivated for its sweet and aromatic flavoring, which is extracted from its root.

Mentha: Mentha is a plant genus in the Lamiaceae family, containing 13 to 24 species. Natural hybridization occurs when species' ranges overlap, resulting in numerous known hybrids and cultivars.

Nutmeg: Nutmeg is a spice derived from the seed of trees of the genus Myristica. It is also the source of mace, a spice derived from the seed covering. Nutmeg is produced in Indonesia and is the main ingredient in nutmeg and mace. The tree is native to Indonesia and is also used to obtain nutmeg essential oil and nutmeg butter.

Parsley: Parsley, a flowering plant in the Apiaceae family, is native to Greece, Morocco, and the former Yugoslavia. It has been introduced and cultivated worldwide as a popular herb and vegetable.

Saffron: Saffron is a spice made from the flower of the saffron crocus. Its vivid crimson stigma and styles are collected and dried for use in food as a seasoning and colorant. Its origin is uncertain, but it is believed to have originated in Iran, with Greece and Mesopotamia also suggested. It spread throughout Eurasia and was later introduced to parts of Africa, America, and Oceania.

Thyme: Thyme is a perennial herb in the mint family, known for its aromatic properties. It belongs to the genus Thymus and is related to oregano. Thyme is native to the Mediterranean region and is commonly used in cooking, medicine, and as an ornamental plant. The most widely cultivated species is Thymus vulgaris.

Vanilla: Vanilla is a spice sourced from vanilla orchids, mainly extracted from the pods of the flat-leaved vanilla plant (V. planifolia).

Fungus: Fungi are eukaryotic microorganisms found in the same kingdom as animals, plants, and some other microorganisms. They include yeasts, molds, and mushrooms.

Mushroom: A mushroom is a fleshy fruiting body of a fungus, grown above ground or on soil/food source. "Toadstool" usually refers to a mushroom poisonous to humans.

Ascomycota: Ascomycota is a large phylum of fungi that is part of the kingdom Fungi. It forms the subkingdom Dikarya along with Basidiomycota. Ascomycota contains over 64,000 species and is known for its sac fungi or ascomycetes. The defining feature of this group is the "ascus," a microscopic structure where nonmotile spores called ascospores are formed. However, some Ascomycota species are asexual and do not form ascus or ascospores. Well-known examples of sac fungi include morels, truffles, brewers' and bakers' yeast, dead man's fingers, and cup fungi. Ascomycota fungi are also commonly found as symbionts in lichens, such as Cladonia.

Basidiomycota: Basidiomycota is a division within the kingdom Fungi that, together with Ascomycota, forms the subkingdom Dikarya. Its members, called basidiomycetes, include various groups like agarics, puffballs, bracket fungi, and more. Basidiomycota also encompasses human pathogens like Cryptococcus and is known for its diversity and ecological importance.

Lichen: Lichens are composite organisms formed from algae or cyanobacteria and multiple fungi species. They play a vital role in nutrient cycling and serve as a food source for various animals. Lichens possess unique properties and come in diverse colors, sizes, and forms, resembling plants but not being classified as such. They exhibit different growth forms such as fruticose, foliose, crustose, and leprose.

Yeast: Yeast is a single-celled microorganism belonging to the fungus kingdom. It is eukaryotic and has been around for hundreds of millions of years. There are more than 1,500 known species of yeast, making up around 1% of all described fungi.

Saccharomyces cerevisiae: Saccharomyces cerevisiae is a yeast that has been used in winemaking, baking, and brewing since ancient times. It was originally found on grape skins and is extensively studied in molecular and cell biology. S. cerevisiae is responsible for the most common form of fermentation, and its cells are round and reproduce by budding.

Zygomycota: Zygomycota, or zygote fungi, is a former division of the Fungi kingdom that is now classified under two phyla: Mucoromycota and Zoopagomycota. There are around 1060 known species, primarily found on land in soil or decaying organic matter. They can be parasites of plants, insects, and small animals, or have symbiotic relationships with plants. Zygomycota hyphae are usually coenocytic, forming septa only for gamete formation or to isolate dead hyphae. However, Zygomycota is no longer considered a valid classification since it was not believed to be monophyletic.

Agaricus: Agaricus is a diverse genus of mushroom-forming fungi, comprising over 400 known species and potentially many more disputed or newly-discovered ones. It includes both edible and poisonous mushrooms, with notable representatives being the common "button" mushroom and the field mushroom, which are widely cultivated in the Western world.

Boletus edulis: Boletus edulis is a widely distributed basidiomycete fungus, found in Europe, Asia, and North America. It has been introduced to southern Africa, Australia, New Zealand, and Brazil. Previously thought to be varieties, related European mushrooms are now recognized as distinct species. Some mushrooms once considered separate species are actually the same as B. edulis. The California king bolete, identified in 2007, is a larger and darker variant found in western North America.

Chanterelle: Chanterelle is a type of fungi found in various genera. They are popular edible mushrooms, with orange, yellow, or white colors and a funnel-like shape. Most species have forked folds underneath the cap, emitting a fruity aroma similar to apricots. The name "chanterelle" comes from the Greek word for "tankard" or "cup," referencing their shape.

Pleurotus ostreatus: Pleurotus ostreatus, also known as oyster mushroom, is a popular edible fungus. It is commonly found in the wild but can also be cultivated on straw and other materials.

Shiitake: The shiitake mushroom is a widely cultivated and consumed edible fungus originating from East Asia. It is valued for its medicinal properties in traditional medicine.

Truffle: Truffles are subterranean fungi, specifically the fruiting bodies of the Tuber genus and other genera like Geopora and Peziza. They belong to the Pezizomycetes class and Pezizales order. Typically found near tree roots, truffles play ecological roles in nutrient cycling and drought tolerance. Spores are spread by animals that consume fungi.

Amanita muscaria: Amanita muscaria, also called fly agaric or fly amanita, is a large red mushroom with white spots. It belongs to the Amanita genus of basidiomycetes and has white gills.

Amanita phalloides: Amanita phalloides, also known as the death cap, is a deadly poisonous fungus found in Europe. It forms symbiotic relationships with various broadleaved trees. The death cap has spread to other parts of the world through the cultivation of non-native tree species. Its mushrooms, which appear in summer and autumn, have greenish caps and white stipes and gills. The cap color varies, making it an unreliable identifier.

Plankton: Plankton are aquatic organisms that cannot move against a current. They are an important food source for various marine animals like fish and whales.

Prokaryote: A prokaryote is a single-cell organism without a nucleus or other membrane-bound organelles, derived from the Greek words for "before" and "nut." In the two-empire system, prokaryotes were part of the Prokaryota empire, but in the three-domain system, they are split into Bacteria and Archaea. Eukaryotes with nuclei are placed in the third domain, Eukaryota.

Archaea: Archaea is a domain of single-celled microorganisms that lack cell nuclei, making them prokaryotes. Initially considered bacteria, they were called archaebacteria but this term is no longer used.

Bacteria: Bacteria are single-celled organisms that are found everywhere on Earth. They were among the first life forms and can survive in various environments. Bacteria play a vital role in recycling nutrients and fixing nitrogen. They decompose dead bodies and provide nutrients in extreme environments. Bacteria can live in relationships with plants and animals. Many species of bacteria remain uncharacterized and cannot be grown in a lab. Bacteriology is the study of bacteria.

Cyanobacteria: Cyanobacteria, also known as Cyanobacteriota or Cyanophyta, are gram-negative bacteria that perform photosynthesis for energy. Despite being called blue-green algae, they are not commonly classified as algae. Originating in freshwater or terrestrial environments, cyanobacteria produce cyanotoxins that can have harmful effects on human and animal health.

Escherichia coli: Escherichia coli is a common bacterium found in the lower intestine of warm-blooded organisms. Most strains are harmless or even beneficial, producing vitamin K2 and preventing the colonization of pathogenic bacteria. However, some strains can cause serious food poisoning and prompt product recalls. E. coli is expelled in fecal matter and grows rapidly in fresh feces but its numbers decline over time.

Salmonella: Salmonella is a group of bacteria that are rod-shaped and gram-negative. It belongs to the Enterobacteriaceae family and includes two known species: Salmonella enterica and Salmonella bongori. S. enterica has six subspecies, with over 2,600 serotypes. This bacteria was named after Daniel Elmer Salmon, an American veterinary surgeon.

Staphylococcus aureus: Staphylococcus aureus is a Gram-positive bacterium commonly found in the human microbiota, residing in the upper respiratory tract and on the skin. It can act as a harmless member of the body's bacteria but can also become a dangerous pathogen causing skin infections, respiratory issues, and food poisoning. The bacterium has the ability to survive without oxygen and produces virulence factors that aid in infection. It is a major contributor to deaths related to antimicrobial resistance, especially methicillin-resistant S. aureus (MRSA). Despite efforts, there is currently no approved vaccine for S. aureus.

Eukaryote: Eukaryotes are organisms with cells that contain a nucleus surrounded by a membrane. They include animals, plants, fungi, and many unicellular organisms. Eukaryotes are a major group of life forms, outnumbered by prokaryotes but having a larger global biomass due to their larger size.

Algae: Algae refers to a diverse group of photosynthetic organisms that range from unicellular microalgae to large multicellular forms like seaweeds. They can be found in various aquatic habitats and do not possess some specialized structures present in land plants. Phytoplankton, including microalgae, are considered as waterborne algae.

Seaweed: Seaweed is a group of marine algae comprising various species categorized into red, brown, and green macroalgae. Some seaweed types, like kelps, serve as vital habitats for marine creatures, safeguarding their food sources. Additionally, certain types of seaweed, including planktonic algae, play a crucial role in capturing carbon and generating more than half of the Earth's oxygen.

Protist: Protists are eukaryotic organisms that do not belong to the animal, plant, or fungus kingdoms. They form an artificial grouping of different clades that evolved from a common ancestor.

Slime mold: Slime mold, a group of unrelated eukaryotic organisms, includes microscopic species as well as larger plasmodial slime molds visible to the naked eye. Their life cycle involves a single-celled stage and spore formation. Fruiting bodies, formed through aggregation or fusion, produce spores. Slime molds aid in decomposing dead vegetation and some even exhibit parasitic behavior.

Amoebozoa: Amoebozoa is a taxonomic group with about 2,400 known species of amoeboid protists. They have lobose pseudopods and tubular mitochondrial cristae. It is considered a phylum in Protista or Protozoa, but also an unranked "supergroup" in Eukaryota. Molecular genetic analysis confirms it as a monophyletic clade. Amoebozoa is closely related to Opisthokonta, which includes fungi and animals. They are sometimes grouped as Unikonta, Amorphea, or Opimoda.

Chromalveolata: Chromalveolata was a eukaryotic supergroup, considered one of the six major groups within eukaryotes. It emerged from a refinement of the kingdom Chromista proposed in 1981. Chromalveolata represented organisms resulting from a specific type of endosymbiosis involving a red alga and a bikont organism. These organisms possessed plastids containing chlorophyll c.

Stramenopile: Stramenopiles, or Heterokonts, are organisms with stiff tripartite external hairs. The hairs are usually attached to flagella or other parts of the cellular surface. They are part of the SAR supergroup, along with Alveolata and Rhizaria.

Brown algae: Brown algae are a type of multicellular algae found in colder waters of the Northern Hemisphere. They are major seaweeds in temperate and polar regions, often growing along rocky seashores. These algae play a vital role in marine ecosystems as a food source and habitat for various species. Notably, kelp forests formed by species like Macrocystis can reach impressive lengths and support diverse marine life. Sargassum also creates floating mats in the Sargasso Sea, serving as habitats for many species. Some brown algae, like kelps, are even consumed by humans.

Kelp: Kelp is a type of large brown seaweed, not a plant but a stramenopile. It belongs to the order Laminariales and encompasses approximately 30 different genera.

Diatom: Diatoms are a type of algae found in oceans, waterways, and soils worldwide. They contribute significantly to Earth's biomass, producing 20-50% of the planet's oxygen and absorbing billions of tons of silicon annually. Dead diatoms form deep ocean floor layers, while their shells transport nutrients to the Amazon basin from the African Sahara.

Haptophyte: Haptophytes, also known as Haptophyta or Prymnesiophyta, are a group of algae.

Cryptomonad: Cryptomonads are algae that are found in freshwater, as well as marine and brackish habitats. They have plastids and are about 10–50 μm in size, with a flattened shape and an anterior groove or pocket. These organisms usually have two slightly unequal flagella at the edge of the pocket.

Alveolate: Alveolates are protists classified within Eukarya and form a major clade and superphylum. They are part of the SAR supergroup, along with stramenopiles and Rhizaria. Alveolates have tubulocristate mitochondria.

Dinoflagellate: Dinoflagellates are single-celled eukaryotes found in both marine and freshwater habitats. They vary in population based on temperature, salinity, and depth. These organisms are primarily photosynthetic, but some also engage in mixotrophic behavior by combining photosynthesis with prey ingestion.

Paramecium: Paramecium is a unicellular ciliate commonly used as a model organism. It is widely found in freshwater and marine environments, particularly stagnant basins and ponds. Paramecium is easily cultivated, making it popular for studying biological processes in classrooms and labs. Its usefulness as a model organism has led to it being called the "white rat" of the phylum Ciliophora.

Excavata: Excavata is a diverse group of single-celled organisms within the Eukaryota domain. It was first proposed in 1999 and later named by Thomas Cavalier-Smith in 2002. Excavata includes various free-living and symbiotic protists, and some important human parasites like Giardia and Trichomonas. Initially categorized under the now obsolete Protista kingdom, Excavates are distinguished by their unique cell arrangement observed through electron microscopy. They are considered to be a foundational lineage of flagellated organisms.

Euglenozoa: Euglenozoa is a diverse group of flagellate Discoba that includes common free-living species and important human parasites. It is composed of four major groups: Kinetoplastea, Diplonemea, Euglenida, and Symbiontida. These unicellular organisms are typically around 15-40μm in size, but some euglenids can reach lengths of up to 500μm.

Red algae: Red algae, or Rhodophyta, are one of the oldest eukaryotic algae groups. They make up one of the largest algae phyla, with over 7,000 recognized species. The majority of these species are multicellular, marine algae found in the class Florideophyceae. Red algae are abundant in marine habitats and less common in freshwater environments. Only about 5% of red algae species occur in freshwater, and they are more prevalent in warmer areas. Unlike other algae, there are no terrestrial red algae species. This may be due to the loss of core genes and evolutionary plasticity in their last common ancestor.

Rhizaria: Rhizaria is a diverse group of mostly unicellular eukaryotes. They are non-photosynthetic, with a few exceptions. Many foraminifera and radiolaria have a symbiotic relationship with unicellular algae. They vary in form but are predominantly amoeboids with pseudopods. Some Rhizaria possess mineral exoskeletons made of opal, celestite, or calcite. Certain species can grow large in size and contribute to the ocean's primary production.

Medicine: Medicine is a science and practice that cares for patients by diagnosing, treating, preventing, and managing diseases and injuries. It encompasses various healthcare practices, including biomedical research and technology. These methods utilize pharmaceuticals, surgery, psychotherapy, medical devices, and radiation, among others, to restore and maintain health.

First aid: First aid is immediate assistance given to treat minor or serious illnesses or injuries until medical help arrives. It aims to preserve life, prevent worsening of the condition, and promote recovery. It is usually provided by someone with basic medical training. Mental health first aid covers mental health issues, while psychological first aid treats people at risk of developing PTSD. Conflict first aid aims to preserve and recover social or relationship well-being and is being tested in Canada.

Health care: Health care refers to the promotion of well-being through prevention, diagnosis, treatment, and cure of various physical and mental issues. It encompasses a wide range of professions such as medicine, dentistry, nursing, and more, and includes primary, secondary, and tertiary care, along with public health efforts.

Medical ethics: Medical ethics is the study of ethical principles applied to clinical medicine and scientific research. It provides a basis for professionals to navigate conflicts using values like autonomy, non-maleficence, beneficence, and justice. All four values are important and can guide treatment decisions, but conflicts may require prioritizing certain moral elements. Medical ethics is crucial when dealing with involuntary treatment and commitment decisions.

Emergency medical services: Emergency medical services (EMS), also called ambulance or paramedic services, offer immediate pre-hospital treatment, stabilize serious injuries and illnesses, and transport patients to definitive care. They may be referred to as first aid, FAST, emergency, or ambulance squads, as well as other initials like EMAS or EMARS.

Coma: A coma is a prolonged state of unconsciousness where a person cannot be awakened or respond to stimuli. They don't have a normal sleep-wake cycle, lack voluntary actions, and may experience problems with breathing and circulation. Coma patients need extensive medical care to maintain their health and prevent complications. They are completely unaware, unable to feel, speak, or move. Comas can be caused naturally or induced medically.

Vegetative state: A vegetative state or post-coma unresponsiveness is a disorder of consciousness caused by severe brain damage, where patients are partially aroused but lack true awareness. After four weeks, it becomes a persistent vegetative state. This condition is deemed permanent several months after a non-traumatic brain injury or one year after a traumatic injury. The term unresponsive wakefulness syndrome may be used instead, as "vegetative state" carries negative connotations.

Syndrome: A syndrome is a collection of medical signs and symptoms that are often associated with a specific disease or disorder. The term derives from the Greek word meaning "concurrence." When a cause is identified, a syndrome may be classified as a disease. Sometimes, the terms syndrome, disease, and disorder are used interchangeably, which can confuse the understanding of medical diagnoses, particularly for inherited syndromes. Some syndromes have known causes and are more than just a set of signs and symptoms. On the other hand, some syndromes are not specific to only one disease and can be caused by different factors.

Nursing: Nursing is a healthcare profession dedicated to helping individuals, families, and communities achieve and maintain optimal health. Nurses have a unique approach to patient care and receive specialized training. They work in various specialties and often collaborate with other healthcare providers. Nurse practitioners, who have advanced degrees, can prescribe medication and practice independently in some parts of the US. The field of nursing has evolved to include advanced credentials and roles, reflecting changing healthcare needs.

Pharmacist: A pharmacist is a healthcare professional who prepares, dispenses, and manages medications. They provide pharmaceutical advice and guidance and can serve as primary care providers in the community. Pharmacists may also offer health screenings and immunizations.

Physician: A physician, also known as a doctor, is a health professional who practices medicine. They study, diagnose, and treat diseases and injuries to promote and restore health. Physicians may specialize in certain diseases or methods of treatment, or provide general medical care to individuals, families, and communities. Their work requires a deep understanding of medical science and expertise in its practical application.

Hospital: A hospital is a healthcare institution that provides specialized treatment with medical staff, equipment, and auxiliary healthcare. General hospitals have emergency departments for urgent health problems while district hospitals are major healthcare facilities with intensive care beds. Specialized hospitals include trauma centers, rehabilitation hospitals, children's hospitals, geriatric hospitals, and those treating specific medical needs. They can help reduce healthcare costs. Hospitals are classified as general, specialty, or government based on income sources.

Emergency department: The emergency department (ED) is a medical treatment facility specializing in emergency medicine, providing acute care for patients who arrive without prior appointment. Also known as accident and emergency (A&E), emergency room (ER), emergency ward (EW), or casualty department, it is usually located in a hospital or primary care center.

Pharmacy: Pharmacy is the science and practice that encompasses the discovery, production, preparation, dispensing, monitoring, and review of medications. Its aim is to ensure the safe, effective, and affordable use of medicines by linking health sciences with pharmaceutical and natural sciences. The field is evolving towards a more clinically-oriented practice as pharmaceutical industries predominantly manufacture drugs. Pharmacy practice can be categorized as either community or institutional, with the provision of direct patient care in these settings considered as clinical pharmacy.

Psychiatric hospital: Psychiatric hospitals, also called mental health hospitals, provide specialized treatment for severe mental disorders such as schizophrenia, bipolar disorder, eating disorders, and major depression. They play a crucial role in managing and addressing the complexities of these conditions.

Anesthesia: Anesthesia is a controlled, temporary loss of sensation or awareness induced for medical purposes. It involves analgesia, paralysis, amnesia, and unconsciousness. Those under its effects are referred to as anesthetized.

Palliative care: Palliative care optimizes quality of life and eases suffering for individuals with serious, complex, and often terminal illnesses. It involves early identification and impeccable treatment of physical, psychosocial, and spiritual problems. Previously disease-specific, palliative care now takes a patient-centered approach, addressing the needs and preferences of individuals with any chronic and ultimately fatal illness. The primary goal is to relieve suffering and enhance the well-being of terminally ill patients.

Medical test: A medical test is a procedure conducted in a medical setting to detect, diagnose, monitor diseases, or determine treatment. It includes physical exams, imaging, genetic and chemical analysis.

Sterilization (medicine): Sterilization in medicine refers to intentional methods of birth control that make a person unable to reproduce. These methods, available for both males and females, can be surgical or non-surgical. Sterilization procedures are meant to be permanent as reversal is typically challenging or impossible.

Medical diagnosis: Medical diagnosis is the identification of the disease or condition causing a person's symptoms. It involves gathering information through medical history, physical examination, and diagnostic tests. Posthumous diagnosis is also recognized.

Physical examination: A physical examination is a questioning and examination process performed by a medical practitioner to identify signs and symptoms of a medical condition. It involves assessing the patient's medical history, symptoms, and conducting a physical examination. This information aids in diagnosing the condition and forming a treatment plan, recorded as part of the medical record.

Autopsy: An autopsy is a surgical examination of a corpse to determine the cause of death, evaluate any diseases or injuries, or for research/educational purposes. It can also be referred to as necropsy for non-human animals.

Biopsy: A biopsy is a medical test performed by a surgeon, radiologist, or cardiologist to extract and examine sample cells or tissues to determine the presence or extent of a disease. The samples are fixed, dehydrated, sectioned, stained, and examined under a microscope. There are different types of biopsies, including excisional, incisional, and needle aspiration, depending on the extent of tissue removal. Biopsies are commonly done to gain insight into potential cancerous or inflammatory conditions.

Blood test: A blood test is a lab analysis done on a sample of blood to understand various aspects of health including diseases, organ function, mineral levels, and drug effectiveness. It is usually done by extracting blood from a vein or through a fingerprick. Different tests for specific blood components like glucose or cholesterol are often grouped together in a blood panel. Blood tests are commonly used in healthcare, drug detection, and clinical assessment.

Eye examination: An eye examination is a thorough assessment of vision and the ability to see and distinguish objects. It involves various tests and exams related to the eyes and is typically conducted by optometrists, ophthalmologists, or orthoptists. Regular eye exams are highly recommended by healthcare professionals as many eye diseases have no symptoms.

Lumbar puncture: A lumbar puncture, also known as a spinal tap, is a medical procedure where a needle is inserted into the spinal canal to collect cerebrospinal fluid for testing. It helps diagnose diseases of the central nervous system and can be used therapeutically in some cases. However, it is not safe when there is increased intracranial pressure. The procedure is generally safe, but a common side effect is post-dural-puncture headache if a small atraumatic needle is not used.

Pap test: The Pap test is a cervical screening method that detects precancerous and cancerous processes in the cervix or anus. Abnormal findings are followed by more sensitive diagnostic procedures to prevent cervical cancer. It was invented by Georgios Papanikolaou in the 1920s and simplified by Anna Marion Hilliard in 1957.

Reflex: A reflex is an automatic and rapid response to a stimulus in biology. It is an involuntary and unplanned action that happens almost instantly.

Blood pressure: Blood pressure is the force exerted by circulating blood on blood vessel walls. It primarily comes from the heart pumping blood. Blood pressure is commonly measured in the brachial artery, expressed as systolic pressure over diastolic pressure. It is measured in mmHg or kPa. The difference between systolic and diastolic pressures is called pulse pressure, and the average pressure during a cardiac cycle is called mean arterial pressure.

Pulse: A pulse is the tactile arterial palpation of the heartbeat using trained fingertips. It can be felt in various places where an artery is near the surface, such as the neck, wrist, groin, behind the knee, near the ankle, and on the foot. Measuring the pulse is equivalent to measuring the heart rate. It can also be measured by listening to the heartbeat with a stethoscope. The radial pulse is commonly measured using three fingers, with each finger serving a specific purpose. The study of the pulse is known as sphygmology.

Blood transfusion: Blood transfusion is the intravenous transfer of blood components to replace lost blood due to medical conditions. It has evolved from using whole blood to utilizing specific components like red blood cells, white blood cells, plasma, platelets, and clotting factors.

Symptomatic treatment: Symptomatic treatment refers to medical therapy that only addresses the symptoms of a disease, rather than its underlying cause. It aims to provide comfort and well-being by reducing signs and symptoms, and may also help minimize the consequences of the disease. In some cases, it is the only available treatment option. This type of treatment is particularly relevant for conditions like cancer, arthritis, neuropathy, tendinopathy, and injury, where it cannot alter the natural progression of the disease.

Surgery: Surgery is a medical practice that involves using manual or instrumental techniques to investigate and treat diseases, injuries, or alter bodily functions. It can also enhance appearance and remove unwanted tissues or foreign bodies. It is typically performed on humans but can include non-human animals.

Amputation: Amputation is the removal of a limb due to trauma, illness, or surgery. It is done to control pain, treat diseases like cancer or gangrene, or as a preventive measure. Amputation can be congenital, resulting from fetal limb constriction. Unfortunately, in some countries, it is used as a punishment for crimes. It has also been used in warfare and acts of terrorism as a tactic or injury. Certain cultures and religions consider minor amputations as ritualistic. The oldest evidence of amputation dates back to at least 31,000 years ago in Indonesian Borneo.

Dental restoration: Dental restoration, also known as dental fillings, is a treatment to restore missing tooth structure caused by decay or injury. It can replace the damaged structure with dental implants. There are direct and indirect methods, classified by location and size. Root canal filling is a specific technique used to fill the space in the tooth caused by pulp removal.

Dentures: Dentures are removable prosthetic devices that replace missing teeth. They can be supported by the surrounding tissues in the mouth and can either rely on bonding to existing teeth or dental implants. Dentures can be categorized into two types, based on whether they fit on the lower or upper jaw.

Organ transplantation: Organ transplantation is a medical procedure where organs are moved from one person to another to replace damaged or missing organs. This can happen at the same location or by transporting organs from one place to another. Transplants within the same person are autografts, while transplants between different individuals of the same species are allografts. Allografts can come from living or deceased donors.

Plastic surgery: Plastic surgery is a surgical specialty that restores or alters the human body. It has two main categories: reconstructive surgery (for improving function) and cosmetic surgery (for enhancing appearance). Reconstructive surgery includes craniofacial surgery, hand surgery, microsurgery, and treating burns. Plastic surgery overlaps with other specialties and involves tissue relocation skills. It treats conditions requiring such skills.

Therapy: Therapy refers to the process of addressing a health problem after medical diagnosis. It is often abbreviated as tx, Tx, or Tx alongside treatment.

Chemotherapy: Chemotherapy is a cancer treatment involving anti-cancer drugs given in a standardized regimen. It can cure, prolong life, or reduce symptoms. It falls under medical oncology, a discipline dedicated to pharmacotherapy for cancer.

Physical therapy: Physical therapy, also called physiotherapy, is a healthcare profession that involves physical examination, diagnosis, management, and rehabilitation to promote and restore health. Physical therapists, known as physiotherapists in some countries, provide patient education, physical interventions, and disease prevention for optimal health outcomes.

Radiation therapy: Radiation therapy utilizes ionizing radiation to treat cancer and control malignant cell growth. It can be curative for localized cancers and used as adjuvant therapy after tumor removal. Radiation therapy works synergistically with chemotherapy and is performed by radiation oncologists using linear particle accelerators.

Human body: The human body is made up of cells, tissues, and organs that work together to maintain a stable internal environment (homeostasis). These systems ensure the body's overall well-being and functionality.

Blood type: Blood type is a classification of blood based on the presence or absence of antibodies and inherited substances on red blood cells (RBCs). These substances can be proteins, carbohydrates, glycoproteins, or glycolipids. They form blood group systems and can be present on other cell types too.

Human brain: The human brain is the central organ of the nervous system, located inside the skull. It controls the activities of the body, receives and processes information from the senses, and makes decisions for the rest of the body.

Face: The face is an animal's head front with eyes, nose, and mouth where emotions are expressed. It plays a significant role in human identity, and damage or deformities can negatively impact the psyche.

Human eye: The human eye is a sensory organ that reacts to light, enabling us to see, maintain balance, and regulate our sleep-wake cycle.

Human tooth: Human teeth are part of the digestive system and are used to mechanically break down food for swallowing and digestion. There are four types of teeth - incisors, canines, premolars, and molars, each with a specific function. Incisors cut the food, canines tear it, and molars and premolars crush it. The teeth are anchored in the upper and lower jaw and are covered by gums. They are composed of different tissues of varying density and hardness.

Root canal: A root canal is the natural space inside a tooth that contains the pulp chamber and canals. It includes intricate branches connecting the canals to each other and the root surface.

Gastrointestinal tract: The gastrointestinal (GI) tract is the digestive system pathway from the mouth to the anus. It includes essential organs like the esophagus, stomach, and intestines. This tract processes food for nutrient extraction and energy absorption. Subsequently, waste is eliminated as feces through the anus. "Gastrointestinal" refers to anything related to the stomach and intestines.

Human skeleton: The human skeleton is the internal framework of the body, consisting of around 206 bones in adulthood. It makes up about 14% of the body's weight and reaches maximum mass between ages 25 and 30. The skeleton is divided into the axial (vertebral column, rib cage, skull) and appendicular (shoulder and pelvic girdles, upper and lower limb bones) regions.

Human voice: The human voice is the sound produced by the vocal tract in a person, encompassing activities like talking, singing, laughing, crying, and more. It relies on the vocal folds as the primary source and encompasses a range of frequencies.

Arm: The arm refers to the upper limb in human anatomy. Specifically, it includes the upper arm between the shoulder and elbow joints. The forearm is the lower part of the arm, extending between the elbow and wrist joints. Lastly, the hand is the extremity beyond the wrist.

Hand: A hand is a flexible, multi-fingered structure found at the end of the forearm in primates like humans, monkeys, and chimps. Some other animals like koalas and raccoons are also referred to as having "hands," though raccoons lack opposable thumbs.

Finger: A finger is a digit found on the forelimbs of most animals, including humans. It is flexible and opposable, serving as a crucial organ for tactile sensation, fine movements, and grasping objects. Most animals have five fingers, but shorter ones are called toes, while longer ones are referred to as fingers.

Human leg: The human leg refers to the lower limb of the body, including the foot, thigh, and sometimes even the hip or buttock area. It consists of major bones such as the femur, tibia, and fibula. The thigh is located between the hip and knee, while the calf and shin are found between the knee and foot.

Foot: The foot is a weight-bearing structure in vertebrates that allows movement. It is typically a separate organ at the end of a limb, composed of segments or bones, often including claws or nails.

Alternative medicine: Alternative medicine encompasses practices that lack scientific evidence, plausibility, or testability but aim to achieve healing effects. Unlike modern medicine, which relies on scientific methods and clinical trials, alternative therapies rely on anecdotes, testimonials, religion, tradition, and pseudoscience. Frequently referred to as New Age medicine or unorthodox medicine, alternative medicine is often associated with quackery and lacks the rigorous scientific foundation of mainstream medicine.

Chiropractic: Chiropractic is an alternative medicine focused on diagnosing, treating, and preventing musculoskeletal issues, particularly those related to the spine. It originated from esoteric sources and relies on pseudoscientific concepts.

Herbal medicine: Herbal medicine is the study of using medicinal plants, which are the basis of traditional medicine. Some herbal medicines, like artemisinin from Artemisia annua, have been translated into modern remedies. However, there is limited scientific evidence for the safety and efficacy of many plants used in herbalism today. The scope of herbal medicine also includes fungal and bee products, minerals, shells, and certain animal parts.

Homeopathy: Homeopathy is a pseudoscientific alternative medicine system created in 1796 by Samuel Hahnemann. Homeopaths believe that a substance causing symptoms in healthy individuals can cure similar symptoms in sick people. The remedies are produced using repeated dilution, making the final product chemically identical to the diluent without any trace of the original substance. Practitioners assert that these preparations, when taken orally, can treat or cure diseases.

Angiology: Angiology is a medical specialty focused on studying the circulatory and lymphatic systems, which include arteries, veins, and lymphatic vessels.

Cardiology: Cardiology is the study and medical treatment of heart and cardiovascular system disorders. It encompasses the diagnosis and management of congenital heart defects, coronary artery disease, heart failure, valvular heart disease, and electrophysiology. Cardiologists are specialized physicians in this field, while pediatric cardiologists focus on heart conditions in children. Cardiothoracic surgeons perform cardiac surgeries.

Dentistry: Dentistry is a medical field that focuses on the study, diagnosis, prevention, and treatment of diseases and conditions of the teeth, gums, and mouth. It also includes the management of the oral mucosa and the temporomandibular joint. Dentists are the practitioners in this field.

Dermatology: Dermatology is a medical specialty that focuses on the diagnosis and treatment of skin, hair, and nail conditions, as well as certain cosmetic issues. Dermatologists are specialized doctors who manage various skin diseases.

Gastroenterology: Gastroenterology is a medical specialty that deals with the digestive system and its disorders. It includes the gastrointestinal tract, which consists of the esophagus, stomach, small and large intestines, as well as the pancreas, gallbladder, and liver. The digestive system facilitates the movement of material, breaks it down, absorbs nutrients, and eliminates waste. Gastroenterologists, also known as GI doctors, specialize in this field and manage various conditions like reflux disease, bleeding, irritable bowel syndrome, inflammatory bowel disease, ulcers, gallbladder issues, hepatitis, pancreatitis, colitis, polyps, cancer, and nutritional problems.

Geriatrics: Geriatrics is a medical specialty focusing on the unique health needs of the elderly. It aims to promote health, prevent, diagnose, and treat diseases in older adults. Geriatric care is provided by specialized physicians called geriatricians, guided by individual patient needs. It benefits those with multiple chronic conditions or age-related complications, and can be sought when caregiving becomes too stressful or complex for family and caregivers to manage independently.

Hematology: Hematology is a medical field that studies the cause, treatment, and prevention of blood-related diseases. It deals with disorders affecting blood production, components, and clotting mechanism. These include hemophilia, anemia, bleeding disorders, blood cancers like leukemia, and lab analysis of blood.

Immunology: Immunology is the study of immune systems in all organisms. It is a branch of biology and medicine.

Neurology: Neurology is the medical field specializing in diagnosing and treating nervous system conditions. It deals with diseases affecting the brain, spinal cord, and peripheral nerves. Neurology heavily relies on neuroscience, the scientific study of the nervous system.

Oncology: Oncology is the study and treatment of cancer, including diagnosis, therapy, and prevention. It involves the care of patients after treatment and palliative care for terminal cases. The term originates from the Greek word ὄγκος meaning "tumor" or "mass". Oncology also encompasses ethical considerations and screening efforts for populations or relatives of patients.

Ophthalmology: Ophthalmology is a medical specialty focused on diagnosing and treating eye disorders. It includes surgical procedures and was previously known as oculism.

Otorhinolaryngology: Otorhinolaryngology is a medical specialty that deals with conditions of the head and neck. Experts in this field, known as otorhinolaryngologists or ENT surgeons, treat diseases affecting the ear, nose, throat, base of the skull, head, and neck. They manage both surgical and medical interventions, addressing functional issues related to eating, speaking, breathing, swallowing, and hearing. ENT surgery also involves the treatment of cancers, benign tumors, and reconstructive procedures of the head, neck, and face.

Pediatrics: Pediatrics is the branch of medicine that focuses on the medical care of infants, children, adolescents, and young adults. Age limits for pediatric care vary worldwide, with the United Kingdom providing care until the age of 18 and the United States suggesting care up to 21. Pediatricians, specialists in this field, work in various settings such as clinics, research centers, and hospitals, providing healthcare to children.

Pharmacology: Pharmacology is the scientific field that studies drugs and medications, analyzing their origin, composition, effects on the body, and potential for therapeutic use or toxicity. It focuses on understanding the interactions between living organisms and chemicals that impact normal or abnormal biochemical function. If a substance possesses medicinal properties, it falls under the category of pharmaceuticals.

Pharmacokinetics: Pharmacokinetics (PK) is a branch of pharmacology that studies how the body processes substances like drugs and chemicals. It examines their metabolism and tracks their journey from administration to elimination. PK uses mathematical modeling to analyze the relationship between a drug's concentration in the body and the time since it was given. Understanding PK is crucial for determining dosing, benefits, and adverse effects of drugs, in combination with pharmacodynamics (PD), which studies how drugs affect organisms. PK/PD models take both factors into account.

Prescription drug: Prescription drugs require a medical prescription and cannot be obtained without one, unlike over-the-counter drugs. This control is in place due to the risk of misuse, including drug abuse and unlicensed medical practices. Different jurisdictions have varying definitions of prescription drugs.

Psychiatry: Psychiatry is a medical specialty that diagnoses, prevents, and treats harmful mental conditions pertaining to mood, behavior, cognition, and perceptions.

Public health: Public health is the science of preventing disease, extending life, and promoting well-being through organized efforts of society. It involves analyzing health determinants and threats faced by populations of any size, from small groups to entire cities or continents. Health is considered in terms of physical, psychological, and social aspects.

Epidemiology: Epidemiology is the study of health and disease patterns in a specific population, including analyzing their distribution and determining factors.

Preventive healthcare: Preventive healthcare, also known as prophylaxis, involves implementing healthcare measures to proactively prevent diseases. It considers factors like genetics, environment, disease agents, and lifestyle choices that contribute to disease and disability. This approach recognizes that diseases start developing even before individuals become aware of them. Disease prevention strategies encompass various actions, categorized into primal, primary, secondary, and tertiary prevention.

Pulmonology: Pulmonology is a medical specialty focused on respiratory tract diseases. Also known as respirology or respiratory medicine, it is concerned with conditions affecting the chest.

Radiology: Radiology is a medical specialty that uses different imaging techniques to diagnose and treat diseases in humans and animals. It encompasses various modalities, including electromagnetic radiation-based methods like CT scans and fluoroscopy, as well as non-radiation methods. It also includes interventional radiology, in which minimally invasive procedures are performed with the assistance of imaging technologies.

Obstetrics and gynaecology: Obstetrics and gynaecology, a medical specialty, combines obstetrics and gynaecology. It plays a crucial role in women's healthcare.

Sexual and reproductive health: Sexual and reproductive health (SRH) refers to the study, medical services, and advocacy related to an individual's overall reproductive system and sexual well-being throughout their life.

Toxicology: Toxicology is a scientific discipline that studies the harmful effects of chemical substances on living organisms. It overlaps with biology, chemistry, pharmacology, and medicine. Toxicologists diagnose and treat exposures to toxins and toxicants. Dose and its effects on the organism are crucial in toxicology. Factors like dosage, duration of exposure, route, species, age, sex, and environment influence chemical toxicity. Toxicology contributes to evidence-based practices and is significant in cancer research, with certain toxins being explored as drugs for killing tumor cells, like ribosome-inactivating proteins tested for leukemia treatment.

Traditional medicine: Traditional medicine refers to the medical practices and knowledge that have been passed down through generations in different cultures. It includes the use of theories, beliefs, and experiences to maintain health and treat physical and mental illnesses. This form of medicine predates modern scientific medicine and is often contrasted with it.

Ayurveda: Ayurveda, an alternative medicine system originating in the Indian subcontinent, is widely practiced in India and Nepal with approximately 80% of the population using it. However, it is considered pseudoscientific in its theory and practice.

Acupuncture: Acupuncture is an alternative form of medicine originating from traditional Chinese medicine. It involves inserting thin needles into the body. However, acupuncture is considered pseudoscience, lacking scientific basis, and has been criticized as quackery.

Urology: Urology, or genitourinary surgery, is a medical specialty that deals with surgical and medical conditions affecting the urinary-tract system and reproductive organs. It encompasses the kidneys, adrenal glands, ureters, urinary bladder, urethra, and male reproductive organs.

Vaccination: Vaccination is the practice of giving vaccines to develop immunity from diseases. Vaccines can contain weakened or killed microorganisms, proteins, or toxins, which stimulate the immune system to prevent illness. It plays a vital role in achieving herd immunity, protecting vulnerable individuals who cannot be immunized. Vaccination is highly effective in preventing infectious diseases and has led to the eradication of smallpox and the elimination of diseases like polio and tetanus worldwide. However, low vaccination rates have caused outbreaks of diseases like measles in recent years, emphasizing the importance of widespread immunization. According to the WHO, vaccination saves millions of lives annually.

Veterinary medicine: Veterinary medicine is the field of medicine that focuses on preventing, diagnosing, treating, and managing diseases, disorders, and injuries in animals. It covers both domesticated and wild species, with a wide range of conditions.

Drug: A drug is a chemical substance that alters an organism's physiology, including psychology. It differs from food and other substances that provide nutrition. Drugs can be consumed through various methods such as inhalation, injection, smoking, ingestion, absorption, suppository, or dissolution under the tongue.

Medication: Medication is a drug that diagnoses, cures, treats, or prevents disease. It plays a pivotal role in medicine, specifically in drug therapy, where pharmacology and pharmacy drive advancements and ensure proper management.

Placebo: A placebo is a fake medical treatment, often in the form of inert tablets, injections, or procedures like sham surgery.

Amphetamine: Amphetamine is a CNS stimulant used to treat conditions like ADHD, narcolepsy, and obesity. It was discovered in 1887 and as a drug in the late 1920s. Amphetamine exists in two forms: levoamphetamine and dextroamphetamine. It has historically been used to treat nasal congestion and depression. Aside from its medical use, it is also used as an athletic and cognitive enhancer, and recreationally as an aphrodisiac and euphoriant. Due to health risks, unauthorized possession and distribution of amphetamine are tightly controlled.

Benzodiazepine: Benzodiazepines, known as "benzos," are depressant drugs that effectively treat anxiety disorders, insomnia, and seizures. They consist of fused benzene and diazepine rings. Chlordiazepoxide was the first benzodiazepine discovered in 1955, followed by diazepam in 1963. By 1977, they were the most prescribed medications worldwide. While their prescription rates decreased due to the introduction of SSRIs, benzodiazepines are still widely used globally.

Antibiotic: Antibiotics are antimicrobial substances used to fight bacterial infections. They either kill or inhibit the growth of bacteria, making them important in treatment and prevention. However, they are ineffective against viruses and fungi, which require specific antiviral and antifungal drugs.

Penicillin: Penicillin is a group of antibiotics derived from Penicillium moulds. The two main compounds in clinical use are penicillin G and penicillin V. These antibiotics were one of the first effective treatments for bacterial infections caused by staphylococci and streptococci. Despite some bacteria developing resistance, penicillins are still widely used today for various bacterial infections.

Quinine: Quinine is a medication primarily used to treat malaria and babesiosis. It is effective against chloroquine-resistant Plasmodium falciparum malaria when artesunate is unavailable. However, it is not recommended for nocturnal leg cramps due to potential serious side effects. It can be taken orally or intravenously, and some areas have reported malaria resistance to quinine. Additionally, quinine is used in tonic water to provide a bitter taste.

Analgesic: An analgesic is a drug used to relieve pain. It is different from anesthetics, which temporarily reduce sensation. Some drugs have both analgesic and anesthetic effects.

Aspirin: Aspirin (acetylsalicylic acid) is an NSAID that alleviates pain, reduces fever, inflammation, and acts as an antithrombotic. It is prescribed for conditions like Kawasaki disease, pericarditis, and rheumatic fever.

Vaccine: A vaccine is a biological preparation that provides immunity to specific infectious or malignant diseases. It contains a harmless version of the disease-causing agent, which triggers the immune system to recognize and destroy the real agent and any related microorganisms encountered in the future. Vaccines' safety and effectiveness have been extensively researched and confirmed.

Vaccine hesitancy: Vaccine hesitancy refers to the delay or refusal of vaccines despite their availability and supporting evidence. It includes refusing, delaying, having uncertainty, or selectively using vaccines. The scientific consensus strongly affirms the safety and effectiveness of vaccines. Vaccine hesitancy leads to disease outbreaks and preventable deaths, making it a significant global health threat according to the World Health Organization.

Polio vaccine: Polio vaccines, administered through injection (IPV) or orally (OPV), are important in preventing poliomyelitis (polio). The World Health Organization highly recommends full vaccination for all children. These vaccines have successfully eradicated polio from most regions worldwide, significantly reducing the number of reported cases from 350,000 in 1988 to just 33 in 2018.

Smallpox vaccine: The smallpox vaccine is the first vaccine developed against a contagious disease. Edward Jenner proved in 1796 that cowpox infection protected against deadly smallpox. Cowpox acted as a natural vaccine until the modern smallpox vaccine emerged. Thanks to a global WHO vaccination campaign from 1958 to 1977, smallpox was eradicated, the only disease to achieve this. Although not used routinely, the vaccine continues to be produced to guard against bioterrorism and biological warfare.

Alcohol (drug): Alcohol, also known as ethanol, is a depressant drug found in alcoholic beverages. Consumed for recreational purposes, it induces effects like happiness, decreased anxiety, and increased sociability. However, it also impairs cognitive, memory, motor, and sensory functions, as well as depresses the central nervous system. Alcohol is a prominent and ancient recreational drug.

Alcohol intoxication: Alcohol intoxication, commonly known as drunkenness, is the result of consuming alcohol. It is characterized by behavioral and physical effects caused by the toxic properties of ethanol, the main psychoactive component in alcoholic beverages. Acetaldehyde, a byproduct of alcohol metabolism, can also contribute to physiological symptoms. Hangovers may occur several hours later.

Cannabis (drug): Cannabis, also known as marijuana or weed, is a psychoactive drug derived from the cannabis plant. It has been used for recreational and medicinal purposes for centuries. The main psychoactive compound in cannabis is THC, but there are over 480 other compounds including CBD. It can be consumed through smoking, vaporizing, ingesting, or as an extract.

Opium: Opium is a dried latex from the seed capsules of the opium poppy. It contains morphine, which is chemically processed into heroin and other opioids for medical and illegal use. Opium latex also contains codeine, thebaine, papaverine, and noscapine. It is obtained through a labor-intensive method of scratching immature seed pods by hand. The term "meconium" historically referred to weaker opium preparations from other parts of the poppy.

Tobacco: Tobacco, a plant in the Nicotiana genus of the Solanaceae family, refers to products made from cured leaves. With over 70 known species, N. tabacum is the main commercial crop, while N. rustica is a stronger variant used in some countries.

Disease: A disease is an abnormal condition that negatively impacts an organism's structure or function. It is not caused by external injury but can be due to factors like pathogens or internal dysfunctions. Diseases are medical conditions with specific signs and symptoms. Internal dysfunctions of the immune system can lead to different diseases, including immunodeficiency, allergies, and autoimmune disorders.

Acne: Acne is a chronic skin condition caused by clogged hair follicles due to oil and dead skin cells. It leads to blackheads, whiteheads, pimples, oily skin, and sometimes scarring. Commonly affecting the face, chest, and back, it can cause low self-esteem, anxiety, and even depression or suicidal thoughts in severe cases.

Allergy: Allergies are hypersensitivity conditions caused by the immune system reacting to harmless substances. They include hay fever, food allergies, skin conditions, asthma, and severe reactions. Symptoms can include red eyes, rash, sneezing, coughing, runny nose, difficulty breathing, or swelling. Food intolerances and food poisoning are separate conditions.

Alzheimer's disease: Alzheimer's disease (AD) is a progressive neurodegenerative disease, responsible for the majority of dementia cases. It begins with difficulty in remembering recent events and later leads to language issues, disorientation, mood swings, and behavioral problems. Patients often withdraw from society and their bodily functions gradually deteriorate until death. Life expectancy after diagnosis ranges from three to nine years.

Anemia: Anemia is a blood disorder characterized by a reduced ability of the blood to carry oxygen due to a low number of red blood cells, decreased hemoglobin, or abnormalities in hemoglobin. Symptoms can include tiredness, weakness, shortness of breath, headaches, and reduced exercise capacity. Acute anemia may lead to confusion, fainting, loss of consciousness, and increased thirst. It can be temporary or long term, ranging from mild to severe. Preoperative anemia increases the risk of requiring a blood transfusion during surgery. The term is derived from the Greek meaning 'lack of blood'.

Arthritis: Arthritis is a joint disorder causing pain, stiffness, swelling, and limited motion. It can affect other organs and may have a gradual or sudden onset.

Asthma: Asthma is a chronic lung disease characterized by inflammation and obstruction of the airways. Symptoms include wheezing, coughing, chest tightness, and shortness of breath, which can occur frequently or intermittently. It may worsen at night or during exercise.

Autoimmune disease: Autoimmune diseases are caused by the immune system mistakenly attacking healthy body parts instead of foreign organisms. There are over 80 known autoimmune diseases, with the possibility of more than 100 distinct conditions. Any part of the body can be affected.

Bronchitis: Bronchitis is inflammation of the bronchi causing coughing. It often starts as an infection in the nose, ears, throat, or sinuses and spreads to the bronchi. Symptoms include coughing up mucus, wheezing, difficulty breathing, and chest pain. Bronchitis can be either acute or chronic.

Cardiovascular disease: Cardiovascular disease (CVD) refers to a broad range of conditions affecting the heart and blood vessels. It includes diseases like coronary artery disease, heart failure, hypertension, rheumatic heart disease, and more. CVDs can encompass conditions related to the heart, blood vessels, and various heart abnormalities.

Myocardial infarction: A myocardial infarction, or heart attack, occurs when blood flow to the heart muscle is reduced or blocked, leading to damage. Common symptoms include chest pain, shortness of breath, and fatigue. Some people may experience atypical symptoms, such as neck or arm pain. Elderly individuals may have a heart attack without typical symptoms. Complications can include heart failure, irregular heartbeat, shock, or even cardiac arrest.

Chronic obstructive pulmonary disease: COPD is a progressive lung disease that causes long-term respiratory symptoms and airflow limitation. It is characterized by shortness of breath, a cough, and difficulty in performing everyday activities. Emphysema and chronic bronchitis are the most common types of COPD, but other phenotypes exist. Emphysema damages lung tissue, while chronic bronchitis is a productive cough lasting for at least three months per year for two years. Both conditions can exist without airflow limitation but increase the risk of developing COPD. COPD is incurable but preventable and treatable, often coexisting with asthma and systemic inflammation.

Cirrhosis: Cirrhosis is a liver condition where scar tissue replaces healthy tissue, impairing liver function. It develops slowly, causing fatigue, appetite loss, weight loss, and abdominal discomfort. As it worsens, symptoms include swelling, jaundice, easy bruising, and spider-like blood vessels. Complications can include infections, mental confusion, bleeding, and liver cancer.

Dementia: Dementia is a decline in cognitive abilities affecting everyday activities. Symptoms include memory problems, impaired thinking, behavior changes, emotional difficulties, language struggles, and decreased motivation. It progresses in stages and has a profound impact on individuals, caregivers, and social relationships. Diagnosis requires observing significant cognitive decline beyond normal aging.

Diabetes: Diabetes, or diabetes mellitus, is a group of endocrine diseases causing high blood sugar levels. It is caused by insufficient insulin production or cells not responding to insulin. Common symptoms include thirst, frequent urination, weight loss, and blurred vision. If untreated, it can lead to various health complications, including cardiovascular disorders, eye and kidney problems, and nerve damage. Untreated or poorly treated diabetes causes around 1.5 million deaths annually.

Epilepsy: Epilepsy is a non-communicable neurological disorder characterized by recurrent seizures caused by abnormal electrical activity in the brain. It is diagnosed when a person experiences two or more unprovoked seizures. These seizures can range from subtle to severe, sometimes leading to physical injuries. Epilepsy is a chronic condition with no immediate underlying cause, and isolated seizures provoked by specific triggers are not considered epilepsy. People with epilepsy may face varying degrees of social stigma and different treatment approaches worldwide.

Gout: Gout is a type of inflammatory arthritis that causes recurring attacks of red, tender, swollen joints. These attacks are caused by the buildup of needle-like crystals called uric acid crystals. The pain comes on quickly, usually intensifying within 12 hours. The joint at the base of the big toe is commonly affected, known as podagra. Gout can also lead to the formation of tophi, kidney stones, or kidney damage.

Hypertension: Hypertension, or high blood pressure, is a chronic condition characterized by persistently elevated blood pressure in the arteries. It often has no symptoms but increases the risk of serious health problems such as stroke, heart disease, kidney disease, and dementia. This global issue also contributes significantly to premature death.

Meningitis: Meningitis is the inflammation of membranes covering the brain and spinal cord. It causes fever, severe headaches, vomiting, neck stiffness, and sometimes sensitivity to light.

Migraine: Migraine is a complex neurological disorder causing severe headaches, typically on one side, accompanied by nausea, sensitivity to light and sound, and other symptoms. It is often triggered by physical activity and can include a premonitory period called aura. Migraine varies in its presentation, ranging from occasional attacks to chronic disease.

Multiple sclerosis: Multiple sclerosis (MS) is an autoimmune disease that damages the protective covering of nerve cells in the brain and spine, impairing the transmission of signals in the nervous system. This results in a variety of physical, mental, and sometimes psychiatric symptoms, such as vision problems, muscle weakness, and coordination difficulties. MS can present in different forms, with symptoms worsening over time if untreated.

Parkinson's disease: Parkinson's disease (PD) is a chronic disorder of the central nervous system that affects motor and non-motor functions. It causes symptoms like tremors, slowed movements, and difficulty walking. As the condition progresses, cognitive and behavioral issues may arise, alongside sleep and sensory problems. Parkinson's disease dementia is commonly seen in advanced stages.

Tooth decay: Tooth decay, or cavities, is caused by acidic bacteria that break down teeth. Symptoms include pain, difficulty eating, and discoloration of the cavities. Complications can lead to tissue inflammation, tooth loss, and infection.

Injury: Injury refers to physiological damage in living organisms, across humans, animals, and plants.

Major trauma: Major trauma refers to severe injuries that can result in lasting disability or death. It can be caused by falls, car accidents, stabbings, or gunshots. Prompt medical care and transportation to a suitable facility are crucial to prevent serious consequences. A thorough physical evaluation and imaging techniques are used for accurate injury assessment and treatment planning.

Wound: A wound is a damage or disruption to living tissue, such as skin or organs. It can be caused by trauma or disease. Appearance varies based on factors like location and depth. Wound treatment depends on classification, so evaluation by a professional is crucial. Wounds undergo a healing process with several stages. Factors like age, oxygenation, and medical conditions affect healing rate.

Aneurysm: An aneurysm is a localized bulge or weakening of a blood vessel wall, which can be hereditary or acquired. Aneurysms can lead to clot formation and rupture, causing uncontrolled bleeding. They can occur in any blood vessel, with examples including brain aneurysms, aortic aneurysms, and heart-related aneurysms. A rare type is congenital atrial septal aneurysm.

Bleeding: Bleeding, also known as hemorrhage or blood loss, is the escape of blood from damaged blood vessels. It can occur internally or externally through natural openings or punctures in the skin. Excessive blood loss, called exsanguination, can lead to death. Hemostasis, the stopping or controlling of bleeding, is crucial in first aid and surgery. Normally, a healthy person can tolerate losing up to 10-15% of their total blood volume without severe medical complications.

Blunt trauma: Blunt trauma refers to a physical injury caused by a strong impact without piercing the body's surface. It is different from penetrating trauma where the object creates an open wound. This type of trauma can happen due to direct force on a body part, often occurring in road accidents, assaults, sports injuries, and falls among older individuals.

Bone fracture: A bone fracture is a break in any bone, which can range from a partial to a complete break. Severe fractures can result in the bone breaking into multiple fragments called comminuted fractures. Fractures can be caused by high force impacts, stress, or medical conditions weakening the bones, such as osteoporosis or bone cancer. Pathologic fractures occur as a result of these medical conditions.

Brain damage: Brain damage, also known as neurotrauma or brain injury (BI), is the deterioration or destruction of brain cells. It can result from various internal and external factors, typically caused by significant and indiscriminate trauma.

Concussion: A concussion, also called mTBI, is a head injury causing temporary brain dysfunction. Symptoms include memory loss, headaches, difficulty concentrating, and nausea. Symptoms can appear immediately or days after injury, and may last up to 2 weeks in adults and 4 weeks in children. Loss of consciousness is rare in sports-related concussions among children.

Bruise: A bruise, also called a contusion, occurs when capillaries in the tissue are damaged by trauma, resulting in localized bleeding. This bleeding leads to a visible discoloration near the skin's surface. The bruise remains visible until the blood is absorbed or cleared by the immune system. Bruises may involve capillaries in the skin, subcutaneous tissue, muscle, or bone.

Burn: A burn is an injury to skin or other tissues caused by heat, cold, electricity, chemicals, friction, or UV radiation. Most burns occur at home or in the workplace, with common risks including hot liquids, fire, and chemical or electric burns. Alcoholism, smoking, self-harm, and violence are additional risk factors.

Cardiac arrest: Cardiac arrest, or sudden cardiac arrest, refers to the sudden and unexpected cessation of the heart's beating. This leads to inadequate blood circulation, resulting in reduced blood flow to the brain and other organs. Insufficient blood supply to the brain can cause loss of consciousness and unresponsiveness. Cardiac arrest is characterized by the absence of central pulses and abnormal breathing.

Frostbite: Frostbite is a freezing skin injury caused by exposure to extremely low temperatures. It commonly affects fingers, toes, nose, ears, cheeks, and chin. Initial symptoms include cold and tingling sensation, followed by skin discoloration and swelling. Complications can include hypothermia or compartment syndrome.

Hypothermia: Hypothermia is when a person's body temperature drops below 35.0 °C (95.0 °F). Symptoms range from shivering and confusion in mild cases to hallucinations, increased risk of heart stopping, and paradoxical undressing (removal of clothing) in severe cases.

Hypoxia (medicine): Hypoxia is a condition where the body or a specific region lacks sufficient oxygen supply at the tissue level. It can be generalized, affecting the whole body, or local, affecting a specific area. While hypoxia is usually a pathological condition, changes in oxygen levels can occur during intense physical activity.

Respiratory failure: Respiratory failure occurs when the respiratory system cannot maintain normal levels of oxygen and carbon dioxide in the blood. It is classified as Type 1 or Type 2 based on carbon dioxide levels and can be acute or chronic. Symptoms include abnormal blood gases, increased respiratory rate, and increased work of breathing. It can lead to altered mental status due to brain ischemia.

Shock (circulatory): Shock is a condition where insufficient blood flow occurs due to circulatory system issues. Early signs include weakness, rapid heart rate, breathing, sweating, anxiety, and increased thirst. If left untreated, it can escalate to confusion, unconsciousness, or cardiac arrest.

Stroke: A stroke is a serious medical condition where lack of blood flow to the brain causes cell death, leading to impaired brain function. It can be classified into two main types: ischemic (caused by insufficient blood flow) and hemorrhagic (caused by bleeding). Both types result in specific areas of the brain failing to work properly.

Poison: A poison is a harmful or lethal chemical substance that can be defined and used in various scientific fields and industries. It can also be applied colloquially or figuratively with a broad meaning.

Mushroom poisoning: Mushroom poisoning refers to ingestion of toxic mushrooms, causing symptoms ranging from mild gastrointestinal discomfort to death within 10 days. It occurs due to ingestion of mushrooms containing secondary metabolites produced by the fungus.

Toxicity: Toxicity measures the ability of a chemical or substance mixture to harm an organism, whether by affecting its entirety or specific parts like cells or organs. The term is often used interchangeably with "poisoning" in everyday language.

Cerebral palsy: Cerebral palsy (CP) is a childhood condition causing movement disorders. It includes poor coordination, stiff and weak muscles, tremors, and can affect sensation, vision, hearing, and speech.

Color blindness: Color blindness, or color vision deficiency (CVD), is a condition where individuals have a decreased ability to see or differentiate colors. It can range from subtle impairments to the complete inability to perceive colors. This problem is typically inherited and caused by variations in the functionality of cone cells in the retina, which are responsible for color vision. The most common type of color blindness is red-green color blindness, affecting 8% of males and 0.5% of females. Other rarer genetic conditions and external factors can also cause color blindness. Additionally, color vision tends to worsen with age.

Down syndrome: Down syndrome, also known as trisomy 21, is a genetic disorder resulting from the presence of an extra copy of chromosome 21. It is characterized by developmental delays, intellectual disability, and distinct physical traits. There are three types: Trisomy 21, Mosaic Down syndrome, and Translocation Down syndrome, all sharing the same features.

Hearing loss: Hearing loss is the inability to hear, either partially or completely. It can be present from birth or acquired later in life, affecting one or both ears. In children, it can hinder language acquisition, while in adults, it can impair social interactions and work-related tasks. It can be temporary or permanent, and age-related hearing loss typically involves both ears due to cochlear hair cell loss. For some, especially older individuals, hearing loss can lead to feelings of isolation and loneliness.

Intellectual disability: Intellectual disability, also known as general learning disability, is a neurodevelopmental disorder characterized by significantly impaired intellectual and adaptive functioning. It is defined by an IQ under 70 and deficits in two or more adaptive behaviors. Adaptive behaviors encompass conceptual, social, and practical skills used in everyday tasks.

Dyslexia: Dyslexia is a learning disability that affects reading and writing. It manifests differently in individuals, leading to spelling, reading, and writing difficulties. This involuntary condition is often noticed during school years but doesn't affect the desire to learn. Those with dyslexia commonly have higher rates of ADHD, developmental language disorders, and difficulties with numbers.

Physical disability: A physical disability refers to a restriction on a person's physical abilities, including mobility, dexterity, stamina, and daily living functions. It encompasses various impairments like respiratory disorders, blindness, epilepsy, and sleep disorders.

Visual impairment: Visual impairment refers to the partial or total inability to perceive visual information. It is commonly referred to as low vision or blindness. Without treatment or aids such as glasses, visual impairment can make daily tasks like reading and walking challenging. It may also indicate underlying medical issues, even though some cases can be temporary.

Brain tumor: A brain tumor is an abnormal mass of cells that can be cancerous or non-cancerous. There are two main types: primary tumors that start in the brain and secondary tumors that spread from other parts of the body. Symptoms vary depending on the tumor's size and location, including headaches, seizures, vision problems, vomiting, and mental changes. Other symptoms may include difficulty walking, speaking, sensations, or unconsciousness.

Cancer: Cancer is a disease characterized by abnormal cell growth that can invade and spread in the body. Unlike benign tumors, cancer spreads. Signs may include lumps, abnormal bleeding, prolonged cough, weight loss, and changes in bowel movements. These symptoms can indicate cancer or other causes. Humans can be affected by over 100 types of cancer.

Carcinogen: A carcinogen is any substance, radiation, or radionuclide that can cause cancer by damaging the genome or disrupting cellular processes. Examples include asbestos, dioxins, and tobacco smoke. Carcinogenicity can arise from natural or synthetic substances, and it is not always immediately toxic, making its effects potentially hidden or gradual.

Breast cancer: Breast cancer is a malignant tumor originating from breast cells. Symptoms include breast lump, change in shape, skin dimpling, milk rejection, nipple inversion, nipple discharge, or red/scaly skin patches. Advanced cases may have bone pain, swollen lymph nodes, shortness of breath, or yellow skin.

Colorectal cancer: Colorectal cancer, also called bowel, colon, or rectal cancer, occurs when cancer develops in the colon or rectum. Symptoms may include blood in the stool, changes in bowel movements, weight loss, and fatigue. It is mainly caused by aging and lifestyle factors, but some genetic disorders can also contribute. Risk factors include diet, obesity, smoking, lack of physical activity, and inflammatory bowel disease. Certain dietary factors like red meat, processed meat, and alcohol increase the risk. Less than 5% of cases are caused by inheritable genetic disorders. The cancer typically starts as a benign tumor, often in the form of a polyp, which eventually becomes cancerous.

Leukemia: Leukemia is a type of blood cancer that starts in the bone marrow, causing an excess of abnormal blood cells known as blasts or leukemia cells. Symptoms include bleeding, bone pain, fatigue, fever, and a higher susceptibility to infections. Diagnosis involves blood tests or bone marrow biopsy.

Lung cancer: Lung cancer, or lung carcinoma, is a malignant tumor that originates in the lung. It is usually caused by genetic damage to cells in the airways, often from smoking or inhaling harmful chemicals. Damaged cells multiply uncontrollably, forming tumors that can spread, affecting lung function. Eventually, the tumors can metastasize, spreading to other areas of the body.

Lymphoma: Lymphoma is a type of cancer that originates from lymphocytes, affecting the blood and lymph system. It is characterized by enlarged, painless lymph nodes, fever, night sweats, unexplained weight loss, itching, and constant tiredness.

Neoplasm: A neoplasm is an abnormal tissue growth called neoplasia, that occurs independently from the surrounding tissue, even if the initial trigger is removed. It often forms a mass known as a tumor.

Prostate cancer: Prostate cancer is the uncontrolled growth of cells in the prostate gland. It is often detected through blood tests that measure prostate-specific antigen (PSA) levels. A biopsy is necessary to confirm the diagnosis and determine the Gleason score, which indicates the aggressiveness of the tumor. Medical imaging is used to check for cancer spread. The stage of the cancer is determined based on the Gleason score, PSA levels, and imaging results. A higher stage suggests a more advanced and dangerous disease.

Skin cancer: Skin cancer is a common form of cancer in humans arising from abnormal cells in the skin. It can invade other parts of the body. There are three main types: basal-cell (BCC), squamous-cell (SCC), and melanoma. BCC grows slowly and rarely spreads, appearing as a shiny raised area with blood vessels or an ulcer. SCC is more likely to spread and presents as a hard lump or an ulcer. Melanomas are the most aggressive, exhibiting changes in size, shape, color, itchiness, and bleeding.

Melanoma: Melanoma is a cancer originating from melanocytes, the cells that produce pigment. It primarily affects the skin, although it can also occur in the mouth, intestines, or eye. Melanomas often develop from moles, and symptoms include changes in size, shape, color, itchiness, or skin breakdown.

Infection: An infection is when harmful pathogens invade and multiply in tissues, leading to a reaction by the host's tissues to the infectious agent and its toxins. It can cause an infectious disease, which is a communicable illness resulting from an infection.

Pathogen: A pathogen is an organism or agent that can cause disease. It may also be called an infectious agent or germ.

Fungal infection: A fungal infection, also called mycosis, is a disease caused by fungi that affects different parts of the body. It is divided into three types: superficial, subcutaneous, and systemic. Superficial infections include common skin conditions like tinea and yeast infections. Subcutaneous infections affect tissues beneath the skin. Systemic infections are more serious and can affect organs like the lungs and brain. Symptoms vary and can range from rashes to pneumonia-like symptoms.

Virus: A virus is a tiny infectious agent that can only reproduce within living cells. They infect all forms of life, including animals, plants, and microorganisms. Viruses are abundant in all ecosystems and are the most prevalent biological entity. Over 11,000 virus species have been extensively studied since their initial discovery in the late 19th century. The study of viruses is known as virology, a specialized field within microbiology.

Prion: A prion is a misfolded protein that can cause other proteins to also misfold, leading to fatal diseases known as transmissible spongiform encephalopathies (TSEs) in humans and animals. Prions can misfold spontaneously, due to genetic mutations, or when exposed to misfolded proteins. The abnormal structure of prions allows them to trigger cellular death and induce a cascade of protein misfolding.

Foodborne illness: Foodborne illness refers to sickness caused by harmful bacteria, viruses, parasites, toxins (like aflatoxins), and prions present in contaminated food. It can result from consuming undercooked or unsafe food, causing various health issues.

Sexually transmitted infection: A Sexually Transmitted Infection (STI), also known as a Sexually Transmitted Disease (STD) or venereal disease (VD), is an infection spread through sexual activity. Common forms of transmission include vaginal, anal, oral, or manual sex. STIs often don't show symptoms initially, making it easy to spread the infection unknowingly. Symptoms can include vaginal or penile discharge, genital ulcers, and pelvic pain. Infertility can occur with certain STIs.

Encephalitis: Encephalitis is brain inflammation that can cause variable symptoms such as altered consciousness, headache, fever, confusion, stiff neck, and vomiting. Complications may include seizures, hallucinations, speech difficulties, memory problems, and hearing issues.

Gangrene: Gangrene is tissue death caused by reduced blood flow. Symptoms include skin discoloration, numbness, swelling, pain, skin breakdown, and coolness. It commonly affects the feet and hands. Infectious gangrene may be accompanied by a fever or sepsis.

Gastroenteritis: Gastroenteritis, also known as infectious diarrhea or gastro, is inflammation of the stomach and intestines. It causes symptoms such as diarrhea, vomiting, abdominal pain, and can also lead to fever, fatigue, and dehydration. The condition typically lasts less than two weeks and is sometimes referred to as "stomach flu" in the U.S.

Dysentery: Dysentery, also called the bloody flux, causes bloody diarrhea and can lead to symptoms like fever, abdominal pain, and a sense of incomplete defecation. It can also result in dehydration.

Pneumonia: Pneumonia is an inflammatory lung condition impacting small air sacs called alveoli. It causes symptoms like cough, chest pain, fever, and breathing difficulties. The severity of pneumonia varies.

Anthrax: Anthrax is a bacterial infection caused by Bacillus anthracis. It can be contracted through contact with skin, inhalation, or ingestion. Symptoms can appear within one day to more than two months. The skin form presents as a blister that turns into a painless ulcer with a black center. Inhalation form causes fever, chest pain, and difficulty breathing. The intestinal form leads to diarrhea, abdominal pain, nausea, and vomiting.

Botulism: Botulism is a rare and deadly illness caused by a toxin produced by the bacterium Clostridium botulinum. It starts with weakness, blurred vision, fatigue, and speech difficulties. Weakness later spreads to the limbs, chest, and abdomen. Vomiting, abdominal swelling, and diarrhea may also occur. Consciousness is usually not affected and fever is uncommon.

Chlamydia: Chlamydia, caused by Chlamydia trachomatis, is a sexually transmitted infection that often goes unnoticed. Symptoms may occur weeks after infection and include discharge, burning sensation, and swelling. It can lead to pelvic inflammatory disease in women, which can cause infertility or ectopic pregnancy.

Cholera: Cholera is a bacterial infection that affects the small intestine. Common symptoms include watery diarrhea, vomiting, and muscle cramps. In severe cases, it can quickly lead to dehydration and electrolyte imbalance, causing sunken eyes, cold skin, and decreased skin elasticity. Symptoms usually appear within two hours to five days after exposure.

Diphtheria: Diphtheria, caused by Corynebacterium diphtheriae, is an infection with varying symptoms. It starts with a sore throat and fever, gradually progressing to the formation of a grey or white patch in the throat. Severe cases can block the airway and cause a barking cough. Swelling of the neck and involvement of other body parts are possible. Serious complications like myocarditis, nerve inflammation, kidney problems, and bleeding issues may arise.

Gonorrhea: Gonorrhea, also known as the clap, is a sexually transmitted infection caused by the bacterium Neisseria gonorrhoeae. It can infect the genitals, mouth, or rectum. Symptoms in men include pain or burning during urination, penile discharge, and testicular pain. Women may experience burning during urination, vaginal discharge, bleeding between periods, or pelvic pain. If left untreated, it can lead to serious complications such as pelvic inflammatory disease in women and inflammation of the epididymis in men. Some infected individuals may remain asymptomatic. If gonorrhea is not treated, it can spread to the joints or heart valves.

Leprosy: Leprosy, also known as Hansen's disease, is a chronic infection caused by bacteria. It can damage the nerves, respiratory tract, skin, and eyes. The infection may lead to a loss of sensation, resulting in the amputation of extremities. Symptoms can appear within a year or take decades to manifest. Muscle weakness and impaired vision are also common symptoms.

Lyme disease: Lyme disease, also known as Lyme borreliosis, is a bacterial infection transmitted by ticks. The main symptom is a red rash called erythema migrans, which appears a week after being bitten. Other early signs can include fever, headaches, and tiredness. If left untreated, it can lead to facial paralysis, joint pain, and severe headaches. In some cases, recurrent joint pain and tingling sensations may occur. Even with treatment, about 10 to 20% of individuals may experience long-term joint pain, memory issues, and fatigue.

Bubonic plague: The bubonic plague is a type of plague caused by the bacterium Yersinia pestis. Symptoms include flu-like symptoms, swollen and painful lymph nodes, and acral necrosis. Occasionally, swollen lymph nodes may burst.

Scarlet fever: Scarlet fever, also known as scarlatina, is an infectious disease caused by Streptococcus pyogenes. It primarily affects children aged 5-15. Symptoms include sore throat, fever, headache, swollen lymph nodes, and a distinctive red rash that feels rough like sandpaper. The face is flushed, the tongue may be red and bumpy, and the rash is hard to see on darker skin. The infection is caused by toxins released by the bacteria.

Syphilis: Syphilis, caused by Treponema pallidum subspecies pallidum, is a sexually transmitted infection that manifests in four stages. The initial stage presents with a single or multiple sores (chancre), followed by a rash in secondary syphilis. Latent syphilis is asymptomatic, while tertiary syphilis may cause gummas, neurological issues, or heart problems. Often referred to as "the great imitator," syphilis shares symptoms with various diseases.

Tetanus: Tetanus, also known as lockjaw, is a bacterial infection caused by Clostridium tetani. It is characterized by muscle spasms starting in the jaw and spreading throughout the body, lasting a few minutes each. Spasms can be severe, leading to bone fractures. Other symptoms include fever, sweating, headache, trouble swallowing, high blood pressure, and a fast heart rate. Onset typically occurs 3 to 21 days after infection. Recovery may take months, but 10% of cases are fatal.

Tuberculosis: Tuberculosis (TB) is an infectious disease caused by Mycobacterium tuberculosis bacteria. It primarily affects the lungs but can also target other parts of the body. Many infections have no symptoms, called latent TB, but about 10% progress to active disease. Symptoms of active TB include chronic cough with bloody phlegm, fever, night sweats, and weight loss. Infection in other organs may cause various symptoms. Left untreated, TB can be fatal for about half of those affected.

Typhoid fever: Typhoid fever, caused by Salmonella enterica serotype Typhi bacteria, shows symptoms such as high fever, abdominal pain, and constipation. Gradual onset, rose-colored rash, and confusion can also occur. Without treatment, symptoms can last for weeks or months. Diarrhea is rare, but individuals can carry and spread the disease without being affected. It is a type of enteric fever, replicating only in humans.

Typhus: Typhus is a group of infectious diseases, including epidemic typhus, scrub typhus, and murine typhus. Symptoms of typhus include fever, headache, and rash, appearing one to two weeks after exposure.

Whooping cough: Whooping cough, or pertussis, is a highly contagious bacterial disease that can be prevented through vaccination. It starts with cold-like symptoms and progresses to severe coughing fits that can last for 10 weeks or more, accompanied by a high-pitched whooping sound. It may cause vomiting, rib fractures, and extreme fatigue. Infants may have difficulty breathing instead of coughing. The incubation period is usually 7-10 days, and even vaccinated individuals can still contract the disease, though their symptoms are usually milder.

Chickenpox: Chickenpox, or varicella, is a contagious disease caused by the varicella zoster virus. It manifests as an itchy skin rash with small blisters that scab over, starting on the chest, back, and face before spreading to the whole body. Symptoms include fever, tiredness, and headaches, which typically last for five to seven days. Although more severe in adults, complications such as pneumonia and inflammation of the brain can occur. Vaccination can prevent this disease.

Common cold: The common cold is a viral infection that primarily affects the upper respiratory tract. Symptoms, which can appear within two days of exposure, include coughing, sore throat, runny nose, sneezing, headache, and fever. Recovery usually takes about 7-10 days, but some symptoms may last up to three weeks. Pneumonia may develop in individuals with pre-existing health conditions.

Dengue fever: Dengue fever is a tropical disease transmitted by mosquitoes, causing symptoms like high fever, headache, vomiting, and joint pains. It is characterized by skin rashes and typically lasts 2-7 days. In some cases, it can escalate to severe dengue hemorrhagic fever or dengue shock syndrome, causing bleeding, low platelet levels, and dangerously low blood pressure.

Ebola: Ebola, also known as Ebola virus disease (EVD) and Ebola hemorrhagic fever (EHF), is a deadly viral illness that affects humans and primates. Symptoms start after 2 days to 3 weeks and include fever, sore throat, muscle pain, and headaches. This is followed by vomiting, diarrhea, rash, decreased liver and kidney function, and internal/external bleeding. Ebola has a high fatality rate, killing between 25%-90% of those infected. Death usually occurs within 6-16 days. Treatment is more effective when started early. An Ebola vaccine was approved by the US FDA in December 2019.

Hand, foot, and mouth disease: Hand, foot, and mouth disease (HFMD) is an infection caused by enteroviruses. It starts with a fever and feeling unwell, followed by spots or blisters on hands, feet, mouth, and sometimes buttocks and groin. Symptoms usually appear 3-6 days after exposure and the rash usually clears in a week. Temporary loss of fingernails and toenails may occur but will regrow.

Hepatitis: Hepatitis is an inflammation of the liver. Symptoms vary and can range from no symptoms at all to yellowing of the skin and eyes, fatigue, and abdominal pain. The condition can be acute, resolving within six months, or chronic, lasting longer. Acute hepatitis can resolve on its own, progress to chronic hepatitis, or rarely, lead to acute liver failure. Chronic hepatitis can lead to cirrhosis, liver failure, and liver cancer.

Herpes: Herpes is a viral infection caused by the herpes simplex virus, categorized by the infected body area. It includes oral and genital herpes, alongside other forms.

HIV/AIDS: HIV is a retrovirus that can cause AIDS. Treatment can manage HIV, but without it, a range of conditions can develop, including AIDS.

Human papillomavirus infection: Human papillomavirus (HPV) infection is caused by a DNA virus and often has no symptoms, resolving spontaneously in most cases. However, persistent infection can lead to warts or precancerous lesions. These lesions can increase the risk of cancers in various areas of the body, including the cervix, vulva, vagina, penis, anus, mouth, tonsils, and throat. HPV16 and HPV18 are responsible for the majority of cervical cancer cases, while HPV16 is also a common cause of oropharyngeal cancers. Additionally, HPV is linked to a significant number of other cancers, and HPV6 and HPV11 commonly cause genital warts and laryngeal papillomatosis.

Influenza: Influenza, also known as the flu, is an infectious disease caused by flu viruses. Symptoms range from mild to severe, including fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms usually appear 1-4 days after exposure and last around 2-8 days. In children, diarrhea and vomiting may occur. Influenza can lead to pneumonia or worsen pre-existing health problems like asthma and cardiovascular disease. Other complications may include acute respiratory distress syndrome, meningitis, and encephalitis.

Measles: Measles is a highly contagious disease caused by the measles virus. Symptoms appear 10-12 days after exposure and last for 7-10 days. Fever, cough, runny nose, inflamed eyes, and a red rash are common symptoms. Complications like diarrhea, ear infection, and pneumonia can arise due to weakened immune system. Measles can also lead to seizures, blindness, or brain inflammation. It is preventable with vaccination and should not be confused with rubella or roseola.

Mumps: Mumps is a viral disease that causes non-specific symptoms like fever, headache, muscle pain, and loss of appetite. It is characterized by painful swelling of the parotid glands, known as parotitis. Symptoms usually appear 16 to 18 days after exposure and last for about two weeks. One-third of cases do not display any symptoms.

Polio: Polio, short for poliomyelitis, is an infectious disease caused by the poliovirus. It mostly shows no symptoms, but mild ones like sore throat and fever can occur. Severe cases may experience symptoms like headache, neck stiffness, and paralysis, potentially leading to death. Some individuals may develop post-polio syndrome, resulting in gradual muscle weakness similar to the initial infection.

Rabies: Rabies is a deadly viral disease causing encephalitis in humans and animals. Its historical name, hydrophobia, refers to the fear of liquids due to panic symptoms. Early symptoms include fever and abnormal sensations. These progress to more severe symptoms such as vomiting, violent movements, fear of water, and loss of consciousness. Death is almost certain once symptoms appear, despite treatment. The time between infection and symptom onset is typically one to three months, but can vary. The virus travels along nerves to reach the central nervous system.

SARS: SARS is a severe respiratory disease caused by the SARS-CoV-1 virus, which originated from animals. It was first reported in November 2002, leading to a global outbreak lasting until 2004. Chinese scientists traced the virus from Asian palm civets to cave-dwelling horseshoe bats in Yunnan province.

Smallpox: Smallpox was caused by the variola virus and belonged to the Orthopoxvirus genus. It was eradicated in 1980 after the last known case in October 1977, making it the only human disease to be globally eradicated.

West Nile fever: West Nile fever is caused by the West Nile virus and is primarily transmitted by mosquitoes. 80% of people infected show minimal or no symptoms, while 20% experience fever, headache, vomiting, or a rash. Less than 1% develop encephalitis or meningitis, which can lead to neck stiffness, confusion, or seizures. Recovery can take weeks to months, and those with nervous system involvement face a 10% risk of death.

Yellow fever: Yellow fever is a viral infection that causes symptoms like fever, chills, loss of appetite, muscle pains, and headaches. Most people recover within five days, but in about 15% of cases, the fever returns along with abdominal pain and liver damage. This can lead to yellow skin, increased risk of bleeding, and kidney problems.

Coronavirus: Coronaviruses are RNA viruses that infect both mammals and birds, causing a range of respiratory tract infections. In humans, they can cause mild colds or more severe diseases like SARS, MERS, and COVID-19, which is currently causing a pandemic. They also cause diarrhea in cows and pigs, and hepatitis and encephalomyelitis in mice.

HIV: HIV is a Lentivirus that infects humans and leads to AIDS, a condition where the immune system fails, allowing life-threatening infections and cancers to occur. Without treatment, survival time after HIV infection is estimated to be 9 to 11 years, depending on the subtype.

Tobacco mosaic virus: The Tobacco mosaic virus (TMV) is a RNA virus that attacks a variety of plants, particularly tobacco. It causes distinct patterns of mottling and discoloration on leaves, resembling a mosaic. TMV was the first virus ever discovered and identified as a pathogen. It was crystallized by Wendell Meredith Stanley and it is similar in size to a large synthetic molecule called PG5.

Scabies: Scabies is a contagious skin infestation caused by a tiny mite called Sarcoptes scabiei. It leads to severe itchiness and a pimple-like rash, with possible appearance of burrows on the skin. Symptoms occur within weeks in first-time infections and within 24 hours in subsequent infections. It can affect various body parts, especially wrists, fingers, and waistline. Scratching can worsen the condition and lead to skin breakdown and bacterial infections.

Malaria: Malaria is a mosquito-borne disease that affects humans and other vertebrates. It causes symptoms like fever, fatigue, vomiting, and headaches. Severe cases can lead to jaundice, seizures, coma, or death. Symptoms usually appear 10-15 days after a mosquito bite and recurrence is possible if not properly treated. Recent survivors usually experience milder symptoms upon reinfection, but partial resistance fades without ongoing exposure.

Mental disorder: A mental disorder, also known as a mental illness or psychiatric disorder, is a behavioral or mental pattern that causes distress and impairs personal functioning. It is characterized by significant disturbances in cognition, emotional regulation, or behavior, occurring as single episodes or persistently. There are various types of mental disorders with unique signs and symptoms, all of which are part of mental health.

Anxiety disorder: Anxiety disorders are mental conditions marked by intense anxiety and fear, leading to impaired functioning in various aspects of life. Symptoms include restlessness, irritability, fatigue, difficulty concentrating, increased heart rate, and various other individual-specific manifestations.

Phobia: A phobia is an anxiety disorder where individuals experience persistent and excessive fear towards an object or situation. The fear often arises rapidly and continues for more than six months. Affected individuals take extreme measures to avoid the feared object or situation, going beyond the actual level of danger. If avoidance is not possible, they may feel significant distress. Phobias can be accompanied by symptoms like fainting and panic attacks. It is common for individuals with phobias to have multiple fears, with approximately 75% having more than one phobia.

Post-traumatic stress disorder: PTSD is a mental disorder caused by traumatic events. It leads to disturbing thoughts, distress, and avoidance of trauma-related cues. The way someone thinks and feels may also change, and the fight-or-flight response increases. Symptoms persist for over a month. Young children may express memories through play. Those with PTSD are at a higher risk of suicide and self-harm.

Attention deficit hyperactivity disorder: ADHD is a neurodevelopmental disorder causing excessive and pervasive inattention, hyperactivity, impulsivity, and emotional dysregulation. It impairs in multiple contexts and is age-inappropriate.

Autism spectrum: Autism, also known as autism spectrum disorder (ASD) or autism spectrum condition (ASC), is a neurodevelopmental disorder characterized by impaired social communication, restricted and repetitive behaviors, and difficulty with social interaction and communication. It includes perseverative interests, stereotypic body movements, rigid routines, and heightened or reduced sensitivity to sensory input. Autism is a spectrum disorder, meaning it presents differently in each individual, with variations in communication abilities and support needs.

Eating disorder: An eating disorder is a mental disorder characterized by unhealthy eating behaviors that harm a person's physical and mental health. Types of eating disorders include binge eating, anorexia, bulimia, pica, rumination syndrome, and avoidant/restrictive food intake disorder (ARFID). Anxiety disorders, depression, and substance abuse often coexist with eating disorders. It is estimated that 20-60% of those with an eating disorder also have a history of OCD.

Bipolar disorder: Bipolar disorder, also known as manic depression, is a mental disorder characterized by alternating periods of depression and abnormally elevated mood, known as mania or hypomania. During manic phases, individuals exhibit excessive energy, impulsivity, and decreased need for sleep. Depression is marked by low mood, negative outlook, and a heightened risk of suicide. Bipolar disorder is often associated with other mental health issues like anxiety and substance use disorders.

Major depressive disorder: Major depressive disorder (MDD), or clinical depression, is a mental disorder characterized by persistent low mood, diminished self-esteem, and a lack of interest in activities. It was introduced by US clinicians in the 1970s and later adopted by the American Psychiatric Association. MDD is a widely recognized condition in the field of mental health.

Pedophilia: Pedophilia is a psychiatric disorder where adults or older adolescents have a primary sexual attraction to prepubescent children. It is diagnosed based on the age of attraction being younger than 13. Individuals with this disorder are commonly called pedophiles.

Personality disorder: Personality disorders are mental disorders characterized by ongoing patterns of unhealthy behavior, thinking, and inner experiences that deviate from culturally accepted norms. These patterns are inflexible, develop early in life, and cause significant distress or impairment. The official criteria for diagnosis can be found in the ICD and DSM manuals.

Psychopathy: Psychopathy is a mental condition marked by long-lasting antisocial behavior, diminished empathy and remorse, and bold, impulsive, and narcissistic characteristics. Over time, varying interpretations of psychopathy have emerged, with some similarities and occasional inconsistencies.

Schizophrenia: Schizophrenia is a mental disorder characterized by recurring episodes of psychosis that cause a distorted perception of reality. It includes symptoms like hallucinations, delusions, disorganized thinking, social withdrawal, and flat affect. Diagnosis is made based on observed behavior, psychiatric history, and reports from others. Symptoms typically appear during young adulthood and have no cure. Substance use, depression, anxiety, and obsessive-compulsive disorder often coexist with schizophrenia.

Neurosis: Neurosis refers to mental disorders resulting from repressed past anxiety. It is commonly used to describe anxiety-related conditions in general.

Diarrhea: Diarrhea is the condition of experiencing three or more loose, watery bowel movements per day. It typically lasts a few days, leading to dehydration due to fluid loss. Signs of dehydration include dry skin, irritability, decreased urination, pale skin, rapid heart rate, and reduced responsiveness. Exclusive breastfed babies may have loose but non-watery stools, which is considered normal.

Inflammation: Inflammation is a protective response of body tissues to harmful stimuli, aiming to eliminate the cause of cell injury, remove damaged cells, and initiate tissue repair. It involves immune cells, blood vessels, and molecular mediators.

Psychosis: Psychosis is a mind condition causing trouble distinguishing reality. Symptoms include delusions, hallucinations, incoherent speech, and inappropriate behavior. It may also result in sleep problems, social withdrawal, lack of motivation, and difficulties with daily activities. Psychosis can have severe consequences.

Delusion: A delusion is a false and unchanging belief that does not respond to contradicting evidence. It differs from beliefs based on misinformation as those can be adjusted when presented with new evidence.

Hallucination: A hallucination is a perception without an external stimulus that resembles a real perception. It combines wakefulness and REM sleep states. Hallucinations are vivid and solid, appearing to be in external space. They can be distinguished from dreaming, pseudohallucinations, illusions, and mental imagery. They are also different from delusional perceptions, where a sensed stimulus is given extra meaning.

Toothache: Toothache refers to dental pain caused by dental or non-dental diseases, affecting the teeth and surrounding structures. Severe toothache can disrupt sleep, eating, and daily activities.

Health: Health refers to the state of well-being, with various definitions used for different purposes. It can be enhanced by promoting healthy habits like exercise and quality sleep while avoiding unhealthy behaviors like smoking and excessive stress. Some health factors stem from personal choices, while others are influenced by societal structures and access to healthcare services. Genetic disorders also play a role in individual and collective health.

Mental health: Mental health refers to the overall well-being of an individual, encompassing emotional, psychological, and social aspects. It affects cognition, perception, behavior, and the ability to cope with stress and maintain relationships. It involves subjective well-being, self-efficacy, autonomy, competence, and the realization of one's potential. Mental health also includes the ability to enjoy life and achieve psychological resilience. Cultural differences, personal philosophy, and subjective assessments impact how it is defined. Early signs of mental health difficulties include sleep problems, lack of energy, appetite changes, thoughts of self-harm or harm to others, social withdrawal, and zoning out frequently.

Physical fitness: Physical fitness refers to the state of being healthy and capable of participating in sports, work, and daily tasks. Achieving physical fitness involves maintaining a nutritious diet, engaging in regular and moderate to intense physical activity, resting adequately, and adhering to a structured recovery plan.

Body mass index: The body mass index (BMI) is a measure of an individual's weight in relation to their height, calculated by dividing their weight (in kg) by the square of their height (in m). It provides a numerical representation of a person's body composition and is expressed in units of kg/m2.

Exercise: Exercise is intentional physical activity for improving or maintaining fitness and overall health.

Obesity: Obesity is a medical condition where excessive body fat accumulates, potentially harming health. It is determined by a body mass index (BMI) over 30 kg/m2, with a range of 25-30 kg/m2 considered overweight. Obesity is associated with various health issues, including cardiovascular diseases, type 2 diabetes, sleep apnea, cancer, and osteoarthritis.

Weight loss: Weight loss is the reduction of body mass, achieved by losing fluid, body fat, or lean mass. It can occur unintentionally due to malnourishment or a disease, or intentionally to improve overweight or obesity. Unexplained weight loss not caused by diet or exercise can indicate a severe medical condition known as cachexia.

Ageing: Ageing, the process of becoming older, primarily affects humans, animals, and fungi. Some organisms like bacteria, perennial plants, and certain simple animals may be biologically immortal. Ageing can also refer to individual cells that have stopped dividing or to the entire population of a species.

Breastfeeding: Breastfeeding, or nursing, is the process of feeding a child with human breast milk. It is recommended by the World Health Organization to start within the first hour of a baby's life and continue as often as the baby wants. Exclusive breastfeeding for the first 6 months is advised, with the introduction of complementary foods after that. However, a significant number of babies are not breastfed within the first hour, mothers do not practice exclusive breastfeeding for 6 months, and not all mothers continue breastfeeding up to 2 years and beyond.

Fertilisation: Fertilisation is the fusion of gametes, leading to the creation of a new organism and its development. It is also known as generative fertilisation, syngamy, and impregnation. Insemination and pollination are sometimes referred to as fertilisation, but technically they are different processes. This is part of the sexual reproduction cycle. In angiosperms, double fertilisation involves the combination of a male gamete with two polar nuclei to form a triploid endosperm nucleus.

Infertility: Infertility is the inability to reproduce naturally for animals or plants. While it is abnormal for healthy adults, some eusocial species may experience infertility. Infertility is common in human children and young offspring due to their pre-puberty stage before reproductive capacity begins.

Nutrition: Nutrition is the process of using food to sustain life, providing organisms with nutrients for energy and chemical structures. Lack of adequate nutrients leads to malnutrition. Nutritional science focuses on studying nutrition, primarily human nutrition.

Diet (nutrition): Diet refers to the food consumed by an individual or organism, with emphasis on specific nutrition for health or weight management. Food preferences and taboos vary across cultures and individuals, influenced by personal taste or ethical beliefs. It's important to note that dietary choices can vary in their level of healthiness.

Dietary supplement: A dietary supplement is a manufactured product in pill, capsule, tablet, powder, or liquid form that is taken to supplement one's diet. It can provide nutrients from food sources or synthetic sources. These supplements can contain vitamins, minerals, fiber, fatty acids, and amino acids. Some supplements also include substances that are not essential nutrients but are marketed as having health benefits, such as plant pigments or polyphenols. Animal sources can also be used, such as collagen from chickens or fish. Supplements can be sold individually or in combination and may be combined with other nutrient ingredients. The European Commission has established rules to ensure the safety and appropriate labeling of food supplements.

Food group: A food group is a category of foods with similar nutritional values or biological classifications. Nutrition guides divide foods into groups, and daily servings from each group are recommended for a healthy diet. The USDA in the United States defines food into 4 to 11 groups.

Hunger: Hunger refers to the condition where individuals lack the ability to obtain enough food necessary for basic nutritional needs over an extended period. In the context of hunger relief, it goes beyond a simple desire for food. Severe hunger can lead to malnutrition, starvation, and ultimately, famine.

Malnutrition: Malnutrition refers to a lack or excess of nutrients that adversely affects the body's tissues and form. It can lead to health issues and is commonly observed in children under five years old due to insufficient access to adequate nutrition.

Vitamin: Vitamins are essential organic molecules that organisms need in small amounts for proper metabolism. They cannot be made by the body in sufficient quantities and must be obtained through diet. Some vitamins, like vitamin C, can be synthesized by certain species but not others. Most vitamins exist as groups of related molecules called vitamers.

Occupational safety and health: Occupational safety and health (OSH) is a multidisciplinary field that focuses on ensuring the safety, health, and welfare of people at work. It includes occupational medicine and occupational hygiene. OSH aims to create a safe working environment and prevent work-related injuries and illnesses.

Substance use disorder: Substance use disorder (SUD) is a treatable mental illness where individuals continue to use drugs despite harmful effects. It affects the brain and behavior, leading to an inability to control substance use. Symptoms range from moderate to severe, with addiction being the most extreme form. SUD varies based on age of onset, duration, and type of substance used. Co-occurring mental health disorders are common. SUD is characterized by emotional, physical, and behavioral issues such as guilt, unsuccessful attempts to quit, impaired driving, and withdrawal symptoms. Common substances involved include alcohol, cannabis, opioids, stimulants, benzodiazepines, and others.

Addiction: Addiction is a disorder characterized by a strong desire to use drugs or engage in rewarding behavior, despite harmful consequences. Continued drug use can alter brain function and weaken self-control. Addiction is considered a brain disorder with various psychological and biological factors involved. Common signs include compulsive behavior, preoccupation, and continued use despite negative outcomes. Addictive habits often bring immediate pleasure but can have delayed negative effects.

Alcoholism: Alcoholism, or the problematic use of alcohol, refers to the persistent consumption of alcohol despite negative consequences. It has been recognized throughout history and continues to affect a significant number of people worldwide. The term "alcoholism" was coined in 1852, but alternative clinical terms like "alcohol use disorder" are now preferred to reduce stigma and encourage treatment-seeking behavior.

Substance dependence: Substance dependence, also known as drug dependence, occurs when an individual's functionality relies on repeatedly using a psychoactive substance due to an adaptive state that develops from consumption, resulting in withdrawal symptoms and the need for further drug use. Different from dependence, drug addiction involves compulsive and uncontrollable drug use, despite negative consequences. Addictive drugs are rewarding and reinforcing. ΔFosB, a gene transcription factor, plays a crucial role in the development of various behavioral and drug addictions, but not dependence.

Smoking: Smoking is the act of inhaling combusted substances, mainly tobacco leaves rolled into cigarettes, to introduce the smoke into the bloodstream. Other methods involve smoking pipes and bongs.

Cigarette: A cigarette is a thin cylinder of tobacco rolled in paper for smoking. It is ignited at one end and the resulting smoke is inhaled through the other end. Cigarette smoking is the main way tobacco is consumed. The term is often used specifically for tobacco cigarettes but can refer to other substances as well. Cigarettes are smaller than cigars, use processed leaf, and have a white paper wrapping. Many cigarettes are filtered, but this doesn't reduce the harmful chemicals and carcinogens in the smoke.

Stress (biology): Stress is an organism's response to environmental conditions, and it can be physiological, biological, or psychological. The body reacts to stress by releasing hormones like adrenaline and cortisol. These hormones have two types of levels: resting levels, which are necessary for normal functioning, and reactive levels, which increase in response to stress. Various systems in the body, such as the autonomic nervous system and the hypothalamic-pituitary-adrenal axis, respond to stress.

Hygiene: Hygiene is a practice aimed at safeguarding health and preventing diseases. It encompasses various types, such as personal, medical, sleep, and food hygiene. Personal hygiene includes maintaining body cleanliness, while medical hygiene is practiced at home. Home and everyday hygiene involve tasks like hand washing, respiratory hygiene, and maintaining cleanliness in the kitchen and bathroom. Additionally, food hygiene at home and laundry hygiene are essential for maintaining health.

Bathing: Bathing refers to the act of cleaning the body with water or immersing oneself in water. It serves multiple purposes, including personal hygiene, religious and therapeutic practices. Additionally, the term encompasses recreational activities like sun bathing and sea bathing.

Feminine hygiene: Feminine hygiene refers to personal care products used for menstruation, vaginal discharge, and other functions related to the vulva and vagina. These products include menstrual pads, tampons, pantyliners, menstrual cups, sponges, and period panties. Additionally, feminine hygiene products also encompass items used to cleanse the vulva or vagina, such as douches, wipes, and soap.

Oral hygiene: Oral hygiene involves keeping the mouth clean and healthy through regular brushing and good hygiene habits. It prevents dental diseases like tooth decay and gum diseases such as gingivitis and periodontitis. Regular practice is essential to prevent dental issues and bad breath.

Shaving: Shaving refers to the act of removing hair by cutting it with a razor or similar implement. It is commonly practiced by men to remove facial hair and by women to remove hair from their legs and underarms. When a man completely removes his beard, he is considered clean-shaven.

Science: Science is a rigorous endeavor that organizes knowledge through testable explanations and predictions about the world. It is divided into natural sciences (physical world), social sciences (individuals and societies), and formal sciences (formal systems). Some debate exists about whether formal sciences are scientific disciplines, as they lack empirical evidence. Applied sciences, such as engineering and medicine, utilize scientific knowledge for practical purposes.

Experiment: An experiment is a procedure used to investigate a hypothesis and assess the effectiveness or probability of something new. It reveals cause-and-effect relationships by manipulating specific factors to observe outcomes. Experiments range in goals and size but maintain a repeatable process and logical analysis of results. It is worth mentioning that there are also natural experimental studies.

Nature: Nature is the fundamental character of the ecosphere and the universe. It encompasses the laws, elements, and phenomena of the physical world, including life. While humans are part of nature, their activities can sometimes conflict with or be seen as separate from nature.

Observation: Observation is the act of perceiving and gathering information from the environment. It can be done by using the senses or scientific instruments. Observations in science can be qualitative or quantitative, depending on whether properties are noted or measured. The term also refers to data collected during scientific activities.

Research: Research is systematic work to increase knowledge, involving collecting and analyzing evidence to understand a topic while controlling for biases. It may build on previous work and validate instruments or experiments by replication.

Field research: Field research is the gathering of data outside controlled environments. It includes observing animal behavior in their habitats or studying people in natural settings to understand their language, culture, and social systems. Varies across disciplines.

Laboratory: A laboratory is a controlled facility for scientific research and experiments, commonly found in schools, universities, research institutions, and various other settings. It provides optimal conditions for conducting measurements and technological investigations. Laboratories can also be found in medical establishments, regulatory centers, and even private residences at times.

Scientific law: Scientific laws are statements describing natural phenomena based on repeated experiments and observations. They can predict outcomes and are developed from empirical evidence. Laws reflect fundamental causal relationships and are discovered rather than invented.

Scientific method: The scientific method is a systematic way of acquiring knowledge through careful observation, skepticism, hypothesis formulation, testability, experimentation, and refinement. It has been crucial in the development of science since the 17th century, allowing for unbiased interpretation of observations.

Scientific modelling: Scientific modelling is the creation of models that represent real-world objects, phenomena, or processes to enhance understanding. This involves selecting relevant aspects of the situation and developing a model to replicate the system. Different types of models are used for different purposes, such as conceptual models for understanding, mathematical models for quantification, computational models for simulation, and graphical models for visualization.

Scientific theory: A scientific theory is a repeatedly tested and corroborated explanation of the natural world and universe. It is evaluated using the scientific method, observation, measurement, and evaluation. Controlled experiments are conducted where possible, or abductive reasoning is used. Established theories have withstood rigorous scrutiny and represent scientific knowledge.

System: A system is a unified whole consisting of multiple elements that interact with each other based on rules. It is influenced by its environment and characterized by its boundaries, structure, and purpose. Systems are studied in systems theory and other systems sciences.

Cybernetics: Cybernetics is a systems science that studies circular causal systems with feedback. It focuses on circular causal processes in various systems, including ecology, technology, biology, cognition, and society. It also applies to practical activities like design, learning, and management.

Measurement: Measurement is the quantification of attributes for comparison with other objects or events. It determines the size of a physical quantity using a reference point. Its scope varies depending on the context and discipline. In natural sciences and engineering, measurements don't apply to nominal properties. However, in fields like statistics and social sciences, measurements can have different levels, including nominal, ordinal, interval, and ratio scales.

Accuracy and precision: Accuracy and precision are measures of observational error. Accuracy refers to how close measurements are to the true value, while precision refers to how close the measurements are to each other.

Metrology: Metrology is the study of measurement, crucial in linking human activities. It originated from the French Revolution's desire to standardize units, resulting in the creation of the metric system in 1795. The Bureau International des Poids et Mesures (BIPM) was established to ensure conformity among countries adopting the metric system. This led to the development of the International System of Units (SI) in 1960.

Unit of measurement: A unit of measurement is a fixed quantity used as a standard for measuring the same kind of quantities. Any other quantity of that kind can be expressed as a multiple of this unit.

Imperial units: The term 'Imperial units' refers to the system of units established by the British in 1824. It was further developed through subsequent laws.

United States customary units: United States customary units are a system of measurement units used in the United States and U.S. territories since 1832. They evolved from British units before the U.S. gained independence. Although similar to the imperial system, there are notable differences between the two systems.

Metric system: The metric system is a decimal system of measurement. The International System of Units (SI) is the current international standard for the metric system. It consists of seven base units: meter, kilogram, second, ampere, Kelvin, mole, and candela.

International System of Units: The International System of Units (SI) is a widely used system of measurement, coordinated by the International Bureau of Weights and Measures. It is the modern form of the metric system and has official status in nearly every country worldwide. SI is employed in science, technology, industry, and everyday commerce.

Natural units: Natural units in physics are a system of measurement where only universal physical constants are used as defining units. Each constant functions as a coherent unit for a specific quantity, such as the elementary charge for electric charge. This system defines all units as combinations of powers of these constants.

Planck units: Planck units are a system of units used in particle physics and cosmology. They are defined by four fundamental constants of nature: c, G, ħ, and kB, such that expressing any of these constants in Planck units yields a value of 1. Proposed in 1899 by Max Planck, they provide a natural way to measure physical quantities based on universal properties, rather than on specific objects. Planck units are particularly useful in studying unified theories like quantum gravity.

Degree (angle): A degree (°) is a unit used to measure angles, where a complete rotation is 360 degrees.

Radian: The radian is the standard unit of angle in mathematics. It is defined as the angle subtended at the center of a circle by an arc equal to the radius. It is a dimensionless unit expressed in terms of meters per meter. Radians are commonly used in mathematical writing to measure angles without explicitly specified units.

Steradian: The steradian is the SI unit for measuring solid angles in three-dimensional geometry. It is equivalent to the radian for planar angles. While radians measure circular arc length on a circle, steradians measure the area of a spherical cap on a sphere. The term comes from Greek, combining "stereos" meaning "solid" and "radian."

Metre: The metre is the fundamental unit of length in the SI system. It is defined as the distance traveled by light in vacuum during a specific time interval. This time interval corresponds to 1/299792458 of a second, which is determined by the frequency of a specific caesium transition.

Inch: The inch is a unit of length in the British imperial and US customary systems, equal to 1/36 yard or 1/12 foot. It is derived from the Roman uncia, meaning "twelfth", and is occasionally used to translate similar units in other systems, representing the width of a human thumb.

Foot (unit): The foot (ft) is a unit of length in the British imperial and United States customary systems. It is commonly represented by the prime symbol (′) and is equal to 12 inches. One yard consists of three feet. Since 1959, the foot has been defined as exactly 0.3048 meters.

Cubit: The cubit is an ancient unit of length based on the distance from elbow to fingertip. It was used by Sumerians, Egyptians, and Israelites, and is mentioned in the Bible for Noah's Ark, Ark of the Covenant, Tabernacle, and Solomon's Temple. The common cubit was 24 digits, while royal cubits added a palm for 28 digits. Cubits ranged from 44.4 to 52.92 cm, with ancient Roman cubits as long as 120 cm.

Mile: The mile is a British and American unit of distance based on the older English measurement of 5,280 feet or 1,760 yards. It is also known as the international mile or statute mile. In 1959, it was internationally standardized to be exactly 1,609.344 meters in relation to SI units.

Nautical mile: A nautical mile is a unit of length used in navigation. It was historically defined as the meridian arc length corresponding to one minute of latitude at the equator, making Earth's polar circumference roughly 21,600 nautical miles. The international nautical mile is now defined as 1,852 meters. Speed is measured in knots, which is equivalent to one nautical mile per hour.

Astronomical unit: The astronomical unit is a unit of distance, approximately equal to the average distance from Earth to the Sun, which is about 150 billion meters or 8.3 light-minutes. It represents the varying distance as Earth orbits the Sun throughout the year. In 2012, the astronomical unit was defined precisely as 149,597,870,700 meters.

Light-year: A light-year (ly) is a unit of length used to measure astronomical distances, equal to about 9.5 trillion kilometers or 5.88 trillion miles. It represents the distance light travels in one Julian year, but is often mistakenly thought of as a unit of time.

Parsec: A parsec is a unit of length used in astronomy to measure distances to objects outside our Solar System. It is equal to approximately 3.26 light-years or 30.9 trillion kilometers. The parsec is obtained through parallax and trigonometry, based on the angle at which 1 astronomical unit (AU) subtends. Proxima Centauri, the closest star to the Sun, is about 1.3 parsecs away. Most naked-eye visible stars are within a few hundred parsecs of the Sun, while the farthest known object, the Andromeda Galaxy, is over 700 thousand parsecs away.

Acre: The acre is a unit of land area used in the British and US customary systems. It equals 10 square chains, 1/640 of a square mile, 4,840 square yards, or 43,560 square feet. It's approximately 4,047 m2 or 40% of a hectare. The abbreviation ac is sometimes used, but it is usually spelled out as "acre."

Hectare: A hectare is a non-SI metric unit of area equal to 10,000 square meters, primarily used to measure land. It is equivalent to a square with 100-meter sides. One square kilometer contains 100 hectares. An acre is approximately 0.405 hectares, and a hectare contains around 2.47 acres.

Litre: The litre (L) is a metric unit of volume. It is equal to 1 cubic decimetre (dm3), 1000 cubic centimetres (cm3), or 0.001 cubic metre (m3). It is derived from a cubic decimetre, which is a volume of 10 cm × 10 cm × 10 cm and is one-thousandth of a cubic metre.

Gallon: The gallon is a unit of volume used in British imperial and US customary systems. It has three versions: the imperial gallon (4.54609 litres) used in the UK, Ireland, Canada, Australia, New Zealand, and some Caribbean countries; the US gallon (231 cubic inches) used in the US, Latin American, and Caribbean countries; and the US dry gallon (1/8 US bushel).

Watt: The watt is the SI unit for power, equal to 1 joule per second. It measures the rate of energy transfer and is named after James Watt, a Scottish inventor who played a crucial role in the Industrial Revolution by improving steam engines.

Joule: The joule is the unit of energy in the SI system and is equal to the work done when a force of one newton moves an object by one meter. It is also the energy produced as heat when one ampere of current flows through one ohm of resistance for one second. Named after James Prescott Joule.

Calorie: The calorie is a unit of energy derived from the caloric theory of heat. It measures the amount of heat required to raise the temperature of water by a certain degree. The large calorie is used in food and diet contexts, equivalent to 1000 small calories.

Electronvolt: An electronvolt (eV) is a unit of energy used to measure the amount of kinetic energy gained by a single electron. It is equivalent to the energy gained when an electron passes through an electric potential difference of one volt in vacuum. 1 eV is equal to the charge of an electron in coulombs. According to the 2019 redefinition of SI base units, 1 eV is precisely equal to 1.602176634×10−19 J.

Pascal (unit): The pascal is the SI unit of pressure and is named after Blaise Pascal. It is equal to one newton per square meter (N/m2). It is used to measure internal pressure, stress, Young's modulus, and ultimate tensile strength. It is also equivalent to 10 barye in the CGS system. Common multiples of the pascal include the hectopascal and kilopascal.

Standard atmosphere (unit): The standard atmosphere is a pressure unit equal to 101325 Pa. It serves as a reference for pressure and approximates the average atmospheric pressure at sea level.

Newton (unit): The newton is the SI unit of force, defined as the force required to give a 1 kg mass an acceleration of 1 m/s². It is named after Isaac Newton, who formulated the second law of motion in classical mechanics.

Dalton (unit): The dalton (unit) is a non-SI unit of mass. It is defined as 1/12 of the mass of an unbound neutral atom of carbon-12 in its ground state and at rest. It is also referred to as the unified atomic mass unit. The atomic mass constant, denoted mu, is equivalent to 1 dalton.

Kilogram: The kilogram, symbol kg, is the fundamental unit of mass in the SI system. Used globally in various fields, it is commonly referred to as a kilo. It corresponds to one thousand grams.

Ton: A ton is a unit of measurement for mass, volume, or force with various meanings and uses.

Ounce: The ounce is a measurement unit used for mass, weight, or volume, originating from the Ancient Roman uncia. It has multiple variations and remains largely unaltered throughout history.

Pound (mass): The pound or pound-mass is a unit of mass used in both the British imperial and United States customary systems of measurement. It is defined as exactly 0.45359237 kilograms, and is divided into 16 avoirdupois ounces. The symbol for the avoirdupois pound is lb, but alternative symbols are lbm, #, and ℔ or ″̶.

Knot (unit): The knot is a unit of speed equal to one nautical mile per hour. It is commonly represented by the symbol kn or kt. The knot is used in meteorology, maritime, and air navigation. It is non-SI and widely accepted in aviation.

Decibel: A decibel (dB) is a unit of measurement that represents the ratio of two power or root-power values on a logarithmic scale. It is equal to one-tenth of a bel (B). A difference of one decibel indicates a power ratio of 101/10 or a root-power ratio of 101⁄20.

Second: The second is the SI unit of time, representing 1⁄86400 of a day. It originates from dividing a day into 24 hours, 60 minutes, and 60 seconds each.

Minute: The minute is a unit of time equal to 60 seconds. It is accepted for use in the International System of Units (SI) and is symbolized as min. In the UTC time standard, a minute can sometimes have 61 seconds due to leap seconds, and there is a provision for a negative leap second resulting in a 59-second minute, though this has never occurred in more than 40 years.

Hour: An hour is a unit of time equivalent to 1/24 of a day or 3,600 seconds. It consists of 60 minutes and there are 24 hours in a day.

Day: A day is the 24-hour period corresponding to a complete rotation of the Earth around the Sun. It includes morning, noon, afternoon, evening, and night, shaping the circadian rhythms in various organisms and impacting essential life processes.

Week: A week is a period of seven days commonly used for work, rest, and worship around the world. Weeks are not based on astronomy but are often aligned with yearly calendars.

Month: A month is a unit of time used in calendars, roughly equivalent to the natural orbital period of the Moon. The concept of months originated from the cycle of Moon phases, known as synodic months, which last around 29.53 days. This led people in the Paleolithic age to count days based on lunar phases. Nowadays, synodic months remain a fundamental basis for many calendars, dividing the year into approximately 12.37 months.

Year: A year represents the duration needed for celestial objects to complete an orbit. On Earth, it corresponds to the time taken for Earth to revolve around the Sun. Besides referring to a calendar year, the term encompasses various periods related to the calendar or astronomy, like seasonal, fiscal, and academic years. Additionally, it can denote any lengthy cycle, such as the Great Year.

Hertz: The hertz is the unit of frequency in the International System of Units (SI), equal to one event per second. It is named after Heinrich Rudolf Hertz, who proved the existence of electromagnetic waves. Hertz are commonly expressed in multiples: kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz).

Coulomb: The coulomb (C) is the SI unit for electric charge. It is the charge delivered by 1 ampere current within 1 second and is defined in relation to the elementary charge e. Its value is approximately 6.241509×10^18 e.

Ampere: The ampere (amp) is the SI unit of electric current. It is equal to 1 coulomb moving past a point in 1 second. Named after André-Marie Ampère, a French mathematician and physicist, who is a renowned contributor to electromagnetism.

Volt: The volt is the SI unit for electric potential, voltage, and electromotive force.

Farad: The farad (F) is the unit of electrical capacitance, measuring an object's ability to store an electrical charge. It is equivalent to 1 coulomb per volt (C/V) and is named after the physicist Michael Faraday. In SI base units, 1 F = 1 kg−1⋅m−2⋅s4⋅A2.

Tesla (unit): Tesla is the SI unit for measuring magnetic flux density.

Weber (unit): The weber unit is used to measure magnetic flux in the SI system, with 1 weber equal to 1 volt-second. It corresponds to a magnetic flux density of 1 tesla.

Ohm: The ohm is the SI unit for electrical resistance, named after physicist Georg Ohm. Standard units for resistance were developed during early telegraphy practice. In 1861, the British Association for the Advancement of Science proposed a practical unit derived from existing units of mass, length, and time.

Siemens (unit): The siemens, symbolized as S, is the unit of electric conductance, susceptance, and admittance in the International System of Units (SI). It is equal to the reciprocal of one ohm and is also known as the mho. The siemens was adopted by the IEC in 1935 and approved as a derived unit in 1971 by the 14th General Conference on Weights and Measures.

Henry (unit): The henry is the SI unit of electrical inductance. It measures the self inductance of a coil when a current of 1 ampere produces 1 weber turn of flux linkage. The unit is named after Joseph Henry, an American scientist who independently discovered electromagnetic induction around the same time as Michael Faraday in England.

Celsius: The Celsius scale is a temperature scale used worldwide, alongside the Kelvin scale. It is named after astronomer Anders Celsius and is commonly referred to as Centigrade. This scale measures specific temperatures and temperature differences between two points.

Fahrenheit: The Fahrenheit scale is a temperature scale created by physicist Daniel Gabriel Fahrenheit in 1724. It uses the degree Fahrenheit as its unit. The scale's lower defining point, 0 °F, represents the freezing temperature of a brine solution. The upper limit was initially set at 90 °F, later adjusted to 96 °F, to approximate average human body temperature.

Kelvin: The kelvin, symbol K, is a unit of temperature used in the International System of Units (SI). It is an absolute scale, starting at absolute zero. A change of 1 kelvin corresponds to a change of thermal energy by 1.380649×10−23 J. The kelvin is named after William Thomson, also known as Lord Kelvin, a notable engineer and physicist.

Mole (unit): The mole is the unit of measurement for the amount of substance in the International System of Units (SI). One mole contains approximately 602 sextillion elementary entities, such as atoms or molecules. The Avogadro number represents the number of particles in a mole. Originally based on 12 grams of carbon-12, the mole's value is now approximate due to recent redefinitions of SI base units.

Candela: The candela is the unit of luminous intensity in the SI system. It measures the power of light emitted by a source in a specific direction. Luminous intensity considers the sensitivity of the human eye to different wavelengths of light. The CIE and ISO have standardized this sensitivity. A typical wax candle emits light with a luminous intensity of about one candela. Even if some directions are blocked by an obstacle, the emission in unobscured directions remains approximately one candela.

Lumen (unit): The lumen is the unit of luminous flux, measuring the total visible light emitted by a source per unit of time. It differs from power as it accounts for the human eye's sensitivity to various wavelengths. This unit is standardized by the CIE and ISO. One lux is equal to one lumen per square meter.

Lux: The lux is the SI unit of illuminance, measuring the intensity of light on a surface. It is equal to one lumen per square metre. Lux is used to gauge human visual brightness perception, with its value weighted according to the CIE and ISO luminosity function. Its name is derived from the Latin word for "light".

Becquerel: The becquerel is the SI unit of radioactivity. It measures the number of radioactive decays per second. It is commonly used for human health applications.

Gray (unit): The gray (unit) is the SI unit for measuring ionizing radiation dose. It signifies the absorption of one joule of radiation energy per kilogram of matter.

Sievert: The sievert is a unit in the SI that measures the health risks of ionizing radiation. It represents the likelihood of causing radiation-induced cancer and genetic damage. The sievert is crucial for dosimetry and radiation protection. It is named after Rolf Maximilian Sievert, a prominent Swedish medical physicist who studied radiation dose measurement and the biological effects of radiation.

Bit: A bit is the fundamental unit of information in computing and digital communications, derived from binary digits. It represents a logical state with two possible values, typically "1" or "0", but can also be represented by true/false, yes/no, on/off, or +/−.

Byte: A byte is a unit of digital information that typically consists of eight bits. It was historically used to encode a single character of text and is the smallest addressable unit of memory in many computer systems. To avoid confusion with other byte sizes, an 8-bit byte is often referred to as an octet in network protocols. The bits in an octet are counted with numbering from 0 to 7 or 7 to 0, depending on the bit endianness.

Astronomy: Astronomy is a natural science that explores celestial objects and phenomena in the cosmos. It uses mathematics, physics, and chemistry to study the origin and evolution of planets, stars, galaxies, and more. This includes supernovas, gamma ray bursts, quasars, and cosmic microwave background radiation. Cosmology, a subset of astronomy, studies the entire universe.

Astronomical object: An astronomical object is a naturally occurring structure in the observable universe, while an astronomical body is a single, tightly bound entity. Objects can be complex and consist of multiple bodies or other substructures.

Astrophysics: Astrophysics is a scientific field that uses principles from physics and chemistry to study celestial objects and phenomena. It aims to understand the nature of these heavenly bodies rather than just their positions in space. Astrophysicists investigate various subjects including the Sun, stars, galaxies, planets outside our solar system, interstellar medium, and cosmic microwave background. They examine the emissions of these objects and analyze properties such as luminosity, density, temperature, and chemical composition across the electromagnetic spectrum. This interdisciplinary field incorporates concepts and methods from classical mechanics, electromagnetism, statistical mechanics, thermodynamics, quantum mechanics, relativity, nuclear and particle physics, and atomic and molecular physics.

Extraterrestrial life: Extraterrestrial life refers to life not from Earth. It has not been proven to exist yet, but may range from basic organisms to advanced civilizations. The Drake equation speculates on the possibility of intelligent life elsewhere. This field of study is called astrobiology.

Observatory: An observatory is a place dedicated to observing terrestrial, marine, or celestial events. It is used for various scientific disciplines such as astronomy, climatology, geophysics, oceanography, and volcanology. Observatories have evolved from simple instruments like the sextant to sophisticated facilities.

Luminosity: Luminosity is the measure of electromagnetic energy emitted by an object, such as a star or galaxy. It represents the total amount of radiant power per unit time and is commonly used in astronomy to describe the brightness of celestial bodies.

Magnitude (astronomy): Magnitude in astronomy is a measure of an object's brightness in a specific passband. It was first introduced by Hipparchus in ancient times.

Extinction (astronomy): Extinction in astronomy refers to the absorption and scattering of electromagnetic radiation by dust and gas between an object and the observer. Its effects on star colors were observed prior to 1930, but it was officially documented by Robert Julius Trumpler. For stars near the Milky Way's plane within a few thousand parsecs of Earth, the visual extinction is about 1.8 magnitudes per kiloparsec.

Photometry (astronomy): Photometry is an astronomy technique for measuring the intensity of light emitted by celestial objects. It relies on a photometer, which converts light into an electric current, often using electronic devices like CCD or photoelectric photometers. By calibrating against standard stars, photometers can determine the brightness or apparent magnitude of astronomical objects.

Cosmic distance ladder: The cosmic distance ladder is a set of methods used by astronomers to measure distances to celestial objects. Close objects can be directly measured, while distant objects are determined based on correlations between close and far distance methods. Standard candles, known luminous objects, are often used to estimate distances accurately.

Astrometry: Astrometry is a branch of astronomy focused on accurately measuring positions and movements of celestial bodies. It offers valuable insights into the kinematics and origins of our Solar System and the Milky Way galaxy.

Parallax: Parallax is a displacement in the apparent position of an object seen from two different viewpoints. It is measured by the angle or half-angle of inclination between these viewpoints. Parallax can be used to determine distances, as nearby objects exhibit more noticeable parallax than farther ones.

Solar System: The Solar System is composed of the Sun and its orbiting objects, including eight planets categorized into four terrestrial planets, two gas giants, and two ice giants. It originated 4.6 billion years ago from the collapse of a dense molecular cloud, resulting in the formation of the Sun and a protoplanetary disc.

Formation and evolution of the Solar System: The Solar System formed 4.6 billion years ago from a collapsing part of a giant molecular cloud. The Sun formed in the center while the remaining material flattened into a disk, which later gave rise to planets, moons, asteroids, and other objects in the Solar System.

Nebular hypothesis: The nebular hypothesis is a widely accepted model explaining the formation and evolution of the Solar System. It proposes that the planets formed from gas and dust orbiting the Sun, clumping together over time. Originally developed by Immanuel Kant and modified by Pierre Laplace, it has been expanded to apply to planetary system formation throughout the universe. The modern variant, known as the solar nebular disk model, explains various properties of the Solar System, such as the planets' nearly circular and coplanar orbits, and their motion in the same direction as the Sun's rotation. While some aspects of the original theory remain relevant, many have been replaced by newer ideas in planetary formation.

Interplanetary medium: The interplanetary medium is the substance that fills the Solar System and allows planetary bodies to move. It extends until the heliopause, beyond which the interstellar medium starts. It was previously believed to either be a vacuum or composed of "aether."

Sun: The Sun is a massive hot star at the center of the Solar System. It produces energy through fusion reactions at its core and emits light, ultraviolet, and infrared radiation. This radiation provides the majority of Earth's energy for life. The Sun functions as a magneto-alternator.

Solar wind: The solar wind is a stream of charged particles released from the Sun's corona, consisting of electrons, protons, and alpha particles. It also contains trace amounts of heavy ions and atomic nuclei from elements like C, N, O, Ne, Mg, Si, S, and Fe. The solar wind's density, temperature, and speed vary over time and space due to the interplanetary magnetic field. These particles can escape the Sun's gravity because of their high energy from the corona's temperature, which is influenced by the coronal magnetic field. The boundary between the corona and the solar wind is known as the Alfvén surface.

Mercury (planet): Mercury is the smallest planet closest to the Sun. It has a heavily cratered surface with no geological activity. Despite its small size, it has a similar surface gravity to Mars. Mercury has a thin atmosphere called an exosphere and a weak magnetic field. It also lacks any natural satellites.

Venus: Venus, the second planet from the Sun, is known for its dense atmosphere and volcanic surface. With a diameter similar to Earth's, this terrestrial planet boasts 167 volcanoes over 100 km wide. Its atmosphere is so dense that it becomes a supercritical fluid at surface level and 92 atmospheres.

Earth: Earth is the third planet from the Sun and the only one known to have life. It is a water world, with a global ocean covering 70.8% of its surface. The remaining 29.2% is land, mostly in the form of continental landmasses. Earth's land is humid and covered in vegetation, while polar ice sheets hold more water than all other sources combined. Tectonic plates create mountains, volcanoes, and earthquakes. Earth has a liquid outer core that produces a protective magnetosphere against solar winds and cosmic radiation.

Moon: The Moon is Earth's only natural satellite, orbiting at an average distance of 384,400 km. Its rotation is locked to Earth, resulting in a lunar day matching the lunar month of 29.5 Earth days. The Moon's gravitational pull, along with the Sun's, drives the tides.

Mars: Mars, the fourth planet from the Sun, is known as the Red Planet due to its orange-red surface covered in iron(III) oxide dust. It boasts massive extinct volcanoes and one of the largest canyons in the Solar System. With a diameter of 6,779 km (4,212 mi), Mars is the second smallest terrestrial planet in our Solar System.

Asteroid belt: The asteroid belt is a region between the orbits of Jupiter and Mars that is filled with numerous irregularly-shaped objects called asteroids or minor planets. It is a torus-shaped area centered on the Sun, containing objects much smaller than planets and situated about one million kilometers apart on average. Also known as the main asteroid belt, it differentiates from other asteroid groups in the Solar System.

Ceres (dwarf planet): Ceres is a dwarf planet located in the main asteroid belt between Mars and Jupiter. It was first discovered in 1801 and initially considered a new planet. Later, it was reclassified as an asteroid and then as a dwarf planet, unique for always being inside Neptune's orbit.

Jupiter: Jupiter is the largest planet in our Solar System and orbits the Sun at a distance of 5.20 AU. It has a mass greater than all the planets combined and is about one one-thousandth the mass of the Sun. Jupiter is the third brightest object in the night sky and has been observed since ancient times. It was named after the chief Roman god, Jupiter.

Io (moon): Io is the innermost and third-largest moon of Jupiter, known for its high density, strong surface gravity, and scarcity of water. It is larger than Earth's moon and ranks fourth in size among all moons in the Solar System. Discovered by Galileo Galilei in 1610 and named after the mythological character Io, it was a priestess of Hera and became a lover of Zeus.

Europa (moon): Europa is a moon of Jupiter, the smallest of the four Galilean moons. It is the sixth-closest moon to Jupiter and the sixth-largest moon in our Solar System. Europa was discovered by both Simon Marius and Galileo Galilei and is named after a Phoenician figure from Greek mythology.

Ganymede (moon): Ganymede is Jupiter's largest moon and the biggest in the entire Solar System. It lacks an atmosphere, yet possesses a notable magnetic field. With its lower density, it is larger than Mercury but has lesser surface gravity than Mercury, Io, and the Moon.

Callisto (moon): Callisto is Jupiter's second-largest moon, and the third-largest moon in the Solar System. It is roughly a third larger than Earth's Moon and orbits Jupiter at a distance of 1883000 km. Callisto is part of the four large Galilean moons, discovered in 1610, and is visible from Earth with binoculars.

Saturn: Saturn, the second-largest planet in our Solar System, is a gas giant located sixth from the Sun. With an average radius almost 9.5 times that of Earth, it's significantly less dense but over 95 times more massive.

Enceladus: Enceladus is Saturn's sixth-largest moon, with a diameter of 500 kilometers. Covered mostly by clean ice, it is highly reflective. Its surface temperature reaches a frigid -198 °C during noon. Enceladus showcases diverse surface features, including both old, cratered regions and younger, tectonically deformed terrain.

Titan (moon): Titan (moon) is Saturn's largest moon and the Solar System's second-largest. It boasts a dense atmosphere and is the only known celestial object, aside from Earth, with stable surface liquid bodies.

Uranus: Uranus is the seventh planet from the Sun, known for its gaseous composition and cyan color. It is primarily made up of water, ammonia, and methane in an ice-like state. The planet has a complex cloud structure and the coldest minimum temperature among all Solar System planets. With its unique axial tilt of 82.23° and retrograde rotation rate of 17 hours, Uranus experiences extreme seasons where its poles go through 42 years of continuous sunlight followed by 42 years of darkness during its 84-year orbit around the Sun.

Neptune: Neptune is the eighth and farthest planet from the Sun. It is the fourth-largest and third-most-massive planet in the Solar System. Being denser and smaller than its near-twin Uranus, Neptune has no well-defined solid surface. It orbits the Sun every 164.8 years at a distance of 30.1 astronomical units. Named after the Roman god of the sea, Neptune's symbol is a trident.

Triton (moon): Triton is Neptune's largest moon, discovered in 1846 by William Lassell. It stands out for having a unique retrograde orbit opposite to its planet's rotation. With a composition similar to Pluto, it is believed to have been captured from the Kuiper belt, potentially making it a dwarf planet.

Kuiper belt: The Kuiper belt is a large disc in the outer Solar System, located between Neptune and the Sun. It is much wider and more massive than the asteroid belt. Composed of small bodies, it formed during the early stages of the Solar System. Unlike asteroids, Kuiper belt objects are mostly made of frozen volatiles. This region is home to dwarf planets like Pluto, Orcus, Haumea, Quaoar, and Makemake. Additionally, some of the Solar System's moons, including Triton and Phoebe, may have originated from the Kuiper belt.

Pluto: Pluto is a dwarf planet located in the Kuiper belt, beyond Neptune's orbit. It is the ninth-largest and tenth-most-massive object directly orbiting the Sun. Despite being slightly smaller and less massive than Eris, it is the largest known trans-Neptunian object in terms of volume. Similar to other objects in the Kuiper belt, Pluto is primarily composed of ice and rock. It is significantly smaller than the inner planets and only has one sixth the mass of Earth's moon, with one third of its volume.

Eris (dwarf planet): Eris is a dwarf planet in the Solar System, known for being the most massive after Pluto. Its high-eccentricity orbit places it in the scattered disk, and it was discovered in 2005. Eris, named after the goddess of strife, is the 9th most massive object orbiting the Sun and the largest unvisited by a spacecraft. It measures 2,326 km in diameter, making it slightly smaller than Pluto but with a greater mass. Both Eris and Pluto have surface areas comparable to Russia or South America.

Oort cloud: The Oort cloud, also known as the Öpik–Oort cloud, is a vast icy cloud surrounding the Sun. It extends from 2,000 to 200,000 astronomical units (AU) away. Proposed by Jan Oort in 1950, this cloud is thought to contain planetesimals that replenish the number of long-period comets entering the inner Solar System. These comets are eventually destroyed during their close encounters with the Sun.

Halley's Comet: Halley's Comet, officially known as 1P/Halley, is a short-period comet that appears every 75-79 years. It is the only known comet visible to the naked eye and can be seen twice in a human lifetime. Last seen in 1986, it is expected to reappear in mid-2061.

Alpha Centauri: Alpha Centauri is a triple star system in the constellation of Centaurus. It includes three stars: Rigil Kentaurus, Toliman (B), and Proxima Centauri (C). Proxima Centauri holds the distinction of being the closest star to the Sun, located 4.2465 light-years away.

Arcturus: Arcturus is the brightest star in the constellation of Boötes, with a visual magnitude of −0.05. It is the fourth-brightest star in the night sky and the brightest in the northern celestial hemisphere. Originating from ancient Greece, it is also known as α Boötis or Alpha Boötis. Arcturus is a corner of the Spring Triangle asterism.

Betelgeuse: Betelgeuse is a red supergiant star in the Orion constellation. It is one of the largest stars visible to the naked eye and is ten times more massive than the Sun. It is the tenth-brightest star in the night sky, appearing distinctly reddish. Betelgeuse varies in brightness, with the widest range displayed by any first-magnitude star. It is the brightest star in the night sky at near-infrared wavelengths. Its Bayer designation is α Orionis, also known as Alpha Orionis or α Ori.

Canopus: Canopus, also known as α Carinae, is the brightest star in the southern constellation of Carina and the second-brightest star in the night sky with a visual magnitude of −0.74. It holds its prominence only to Sirius.

Capella: Capella is the brightest star in the constellation Auriga. It is the sixth-brightest star in the night sky and the third-brightest in the northern celestial hemisphere. Capella is circumpolar to observers north of 44°N and is a notable object in the winter sky. Its name means "little goat" and it represents the goat that nursed Zeus in ancient mythology. Capella is located relatively close to the Sun, about 42.9 light-years away. It is also a significant source of X-rays, primarily emitting from its corona.

Cygnus X-1: Cygnus X-1 is a galactic X-ray source in the constellation Cygnus that is widely accepted to be a black hole. It was discovered in 1971 and remains one of the strongest X-ray sources detectable from Earth. With a mass about 21.2 times that of the Sun, it is too small to be any known kind of normal star or object. The source produces occasional X-ray bursts lasting only for about 1 ms, pointing towards a compact object with an event horizon radius of 300 km. Overall, Cygnus X-1 is a highly studied astronomical object, contributing to our understanding of black holes.

Polaris: Polaris is a bright star in Ursa Minor and is commonly known as the North Star or Pole Star. It is the brightest star in its constellation and can be seen easily with the naked eye. Polaris is located very close to the north celestial pole, making it the current northern pole star and useful for navigation.

Procyon: Procyon is the brightest star in the constellation Canis Minor, and one of the closest stars to Earth at a distance of 11.46 light-years. It is commonly known as α Canis Minoris or Alpha CMi.

Rigel: Rigel is a blue supergiant star known as β Orionis or Beta Orionis. It is the brightest and most massive component of a star system in the constellation of Orion. This system, located 860 light-years away, appears as a single blue-white point of light to the naked eye.

Sirius: Sirius is the brightest star in the night sky, named after the Greek word for "glowing" or "scorching." It is designated as α Canis Majoris and has an apparent magnitude almost twice as bright as Canopus. This binary star consists of a main-sequence star, Sirius A, and a faint white dwarf companion, Sirius B, which orbit each other every 50 years.

Vega: Vega is the brightest star in the Lyra constellation, designated as α Lyrae. It is located 25 light-years from the Sun, making it relatively close. Vega is one of the most luminous stars nearby and ranks as the fifth-brightest star at night, and the second-brightest in the northern celestial hemisphere next to Arcturus.

Milky Way: The Milky Way is our galaxy, visible as a hazy band of light in the night sky. Its name is a translation of Latin and Greek terms meaning "milky circle." Galileo first saw individual stars within this band in 1610. Before the 1920s, people believed that the Milky Way contained all the stars in the Universe, but Edwin Hubble proved that it is just one of many galaxies.

Galactic Center: The Galactic Center is the central rotational point and barycenter of the Milky Way. It contains a supermassive black hole called Sagittarius A*, weighing 4 million times the mass of our sun. Located about 26,000 light-years away in the direction of constellations Sagittarius, Ophiuchus, and Scorpius, it is visually brightest near the Butterfly Cluster (M6) or the star Shaula, south to the Pipe Nebula.

Sagittarius A*: Sagittarius A* (Sgr A*) is the supermassive black hole at the center of our Milky Way galaxy. Situated near the border of Sagittarius and Scorpius constellations, it lies about 5.6° south of the ecliptic and is visually close to the Butterfly Cluster (M6) and Lambda Scorpii.

Local Group: The Local Group is a galaxy group including the Milky Way and Andromeda Galaxy with a total diameter of 3 megaparsecs and a mass of 2×10^12 solar masses. It consists of two collections in a "dumbbell" shape, separated by 800 kiloparsecs and moving towards each other at a speed of 123 km/s. It is part of the larger Virgo Supercluster and is home to at least 80 known galaxies, mostly dwarf galaxies.

Andromeda Galaxy: The Andromeda Galaxy is the nearest major galaxy to the Milky Way. Originally called the Andromeda Nebula, it is a barred spiral galaxy known as Messier 31, M31, and NGC 224. With a diameter of about 46.56 kiloparsecs, it lies approximately 765 kpc from Earth. Its name comes from the constellation of Andromeda, where it appears in the sky. The galaxy is named after a princess in Greek mythology who was married to Perseus.

Large Magellanic Cloud: The Large Magellanic Cloud (LMC) is a satellite galaxy of the Milky Way, located about 163,000 light-years away. It is the second- or third-closest galaxy to the Milky Way. The LMC is approximately 32,200 light-years across and is one-hundredth the mass of the Milky Way. It ranks as the fourth-largest galaxy in the Local Group, after the Andromeda Galaxy, the Milky Way, and the Triangulum Galaxy.

Small Magellanic Cloud: The Small Magellanic Cloud (SMC) is a dwarf galaxy located near the Milky Way. It is classified as a dwarf irregular galaxy and contains several hundred million stars. With a diameter of about 5.78 kiloparsecs (18,900 light-years) and a mass of approximately 7 billion solar masses, it is among the nearest intergalactic neighbors of the Milky Way. Despite being about 200,000 light-years away, it is one of the most distant objects visible to the naked eye.

Triangulum Galaxy: The Triangulum Galaxy, also known as Messier 33 or NGC 598, is a spiral galaxy located 2.73 million light-years away in the constellation Triangulum. It is the third-largest member of the Local Group of galaxies, after the Andromeda Galaxy and the Milky Way. It has an isophotal diameter of 18.74 kiloparsecs (61,100 light-years).

3C 273: 3C 273 is a quasar in the Virgo constellation. It is the first quasar discovered and the brightest one from Earth, with a visual magnitude of 12.9. It is located at the center of a giant elliptical galaxy. Its estimated distance is 749 megaparsecs and it has a central supermassive black hole with a mass of approximately 886 million times that of the Sun.

Centaurus A: Centaurus A is a galaxy in the Centaurus constellation, discovered in 1826 by James Dunlop. Its fundamental properties are still debated, but it is known to have a close proximity to Earth and has been extensively studied by astronomers. It is the fifth-brightest galaxy in the sky and is a favored target for amateur astronomers in the southern hemisphere and low northern latitudes.

Messier 87: Messier 87 is an enormous elliptical galaxy in the Virgo constellation, housing trillions of stars. As one of the largest and most massive galaxies in our vicinity, it boasts an abundance of globular clusters, with around 15,000 clusters compared to the 150-200 surrounding our Milky Way galaxy. This galaxy also showcases a high-energy plasma jet originating from its core, stretching over 1,500 parsecs and traveling at a relativistic speed. Additionally, Messier 87 is among the most prominent radio sources in the sky, captivating the attention of both professional and amateur astronomers.

Pinwheel Galaxy: The Pinwheel Galaxy is a spiral galaxy located 21 million light-years away in Ursa Major. Discovered by Pierre Méchain in 1781, it was later included in the Messier Catalogue.

Whirlpool Galaxy: The Whirlpool Galaxy, or Messier 51a (M51a) in the constellation Canes Venatici, is a grand-design spiral galaxy. It is known for being the first galaxy classified as a spiral and contains a Seyfert 2 active galactic nucleus. Located 32 million light-years away, it spans a diameter of 109,000 ly.

Carina Nebula: The Carina Nebula, found in the Carina constellation, is a massive and intricate region filled with bright and dark nebulosity. Situated in the Carina-Sagittarius arm of the Milky Way galaxy, it resides about 8,500 light-years away from Earth.

Crab Nebula: The Crab Nebula is a supernova remnant in the constellation Taurus. It was discovered in 1731 and corresponds with a bright supernova observed by Chinese astronomers in 1054. Its common name comes from a drawing resembling a crab made in 1842. It was the first astronomical object linked to a historically-recorded supernova explosion.

Eagle Nebula: The Eagle Nebula is a young cluster of stars in Serpens. It contains "Pillars of Creation," known for their dark silhouette, as imaged by the Hubble Telescope. This nebula has active regions of gas and dust involved in star formation. It is located in the Sagittarius Arm of the Milky Way.

Horsehead Nebula: The Horsehead Nebula is a dark nebula in the constellation Orion, situated south of Alnitak, the eastern star in Orion's Belt. It belongs to the vast Orion molecular cloud complex. Found within the dust cloud Lynds 1630, it borders the active star-forming H II region known as IC 434.

Orion Nebula: The Orion Nebula is a bright and easily observable diffuse nebula located in the Milky Way, in the constellation of Orion. It is the middle "star" in Orion's "sword," visible to the naked eye with an apparent magnitude of 4.0. Situated about 1,344 light-years away, it is the closest area of massive star formation to Earth. The M42 nebula spans approximately 24 light-years and has a mass 2,000 times that of the Sun. It is often referred to as the Great Nebula in Orion.

Ring Nebula: The Ring Nebula in Lyra is created by a dying star expelling a luminous gas envelope before becoming a white dwarf.

Hyades (star cluster): The Hyades is a well-studied star cluster that is the closest of its kind to Earth, located approximately 153 light-years away. It is a spherical group of hundreds of stars with the same age, origin, chemical properties, and movement in space. In the constellation Taurus, the Hyades Cluster forms a "V" shape alongside the brighter star Aldebaran, although they are not directly related as Aldebaran is much closer to Earth by coincidence.

Omega Centauri: Omega Centauri is a massive globular cluster in the Centaurus constellation. It was first recognized as a non-stellar object by Edmond Halley in 1677. The cluster is located 17,090 light-years away and has a diameter of approximately 150 light-years. With around 10 million stars and a total mass equivalent to 4 million solar masses, it holds the record for being the largest and most massive globular cluster in our galaxy, the Milky Way.

Pleiades: The Pleiades, also known as the Seven Sisters, is an open star cluster located in the Taurus constellation. It is one of the nearest star clusters to Earth, lying about 444 light years away. The Pleiades is easily visible to the naked eye and is the closest Messier object. Additionally, it contains hot B-type stars and is home to the reflection nebula NGC 1432.

Virgo Supercluster: The Virgo Supercluster, also known as the Local Supercluster, is a large collection of galaxies that includes the Virgo Cluster and Local Group, which contains the Milky Way and Andromeda galaxies. It encompasses at least 100 galaxy groups and clusters within a diameter of 33 megaparsecs. It is one of about 10 million superclusters in the observable universe and is part of the Pisces-Cetus Supercluster Complex, a galaxy filament.

Virgo Cluster: The Virgo Cluster is a large group of galaxies located about 53.8 million light-years away in the Virgo constellation. It consists of around 1,300 galaxies and serves as the core of the even bigger Virgo Supercluster. The Local Group, including our own Milky Way, is part of the Virgo Supercluster and is affected by its gravitational pull. The mass of the Virgo Cluster is estimated to be about 1.2×1015 times that of our Sun.

Great Attractor: The Great Attractor is a powerful gravitational force in intergalactic space, acting as the central point of the Laniakea Supercluster. It influences the motion of over 100,000 galaxies, including the Milky Way.

Celestial mechanics: Celestial mechanics is a branch of astronomy that studies the motions of objects in outer space. It applies principles of physics to produce ephemeris data for astronomical objects like stars and planets.

Orbit: An orbit is the curved path an object follows around another object in space. This can include planets orbiting a star, satellites orbiting a planet or moon, or artificial satellites orbiting any celestial body. Orbits can be regular or irregular, but most planets and satellites follow elliptical orbits around a focal point determined by the center of mass. Kepler's laws explain their motion.

Barycenter (astronomy): The barycenter in astronomy is the center of mass for multiple orbiting bodies. It is a dynamic point and not a physical object. This concept is important in the fields of astronomy and astrophysics. The distance from a body's center of mass to the barycenter can be calculated using a two-body problem.

Tidal locking: 'Tidal locking' refers to a state where two orbiting celestial bodies stop changing their rotation rate. In synchronous rotation, a tidally locked body takes the same time to rotate around its axis as it does to revolve around its partner. An example is the moon always showing the same face to the Earth. Usually, only the satellite is tidally locked, but under specific conditions, both bodies can be mutually locked. This phenomenon is observed between Pluto and Charon, as well as between Eris and Dysnomia. Other terms for tidal locking include gravitational locking, captured rotation, and spin-orbit locking.

Eclipse: An eclipse is a temporary obscuring of an astronomical object by another body or by the alignment of three celestial objects. This alignment, called syzygy, can result in either an occultation or a transit. A deep eclipse refers to a situation where a smaller astronomical object is hidden by a larger one.

Lunar eclipse: A lunar eclipse is when the Moon enters Earth's shadow, making it appear darkened. It happens every six months during a full moon when the Moon's orbit aligns with Earth's orbit.

Solar eclipse: A solar eclipse is when the Moon passes between the Earth and the Sun, blocking the Sun's view from a small part of the Earth. It happens every six months during the new moon phase and when the Moon's orbit is closest to Earth's orbit. Total eclipses fully obscure the Sun, while partial and annular eclipses only cover part of it. Unlike lunar eclipses visible from anywhere on the night side of Earth, solar eclipses can only be seen from a small area. Total solar eclipses occur every 18 months on average but are only visible from a specific location once every 360 to 410 years.

Kepler's laws of planetary motion: Kepler's laws of planetary motion, formulated by Johannes Kepler in the early 17th century, describe the orbits of planets around the Sun. They replaced circular orbits with elliptical trajectories and explained variations in planetary velocities. The laws state that planets move in ellipses with the Sun at one focus, the line connecting a planet and the Sun sweeps equal areas in equal times, and a planet's orbital period squared is proportional to the cube of the length of its orbit's semi-major axis.

Lagrange point: Lagrange points are equilibrium points in celestial mechanics, where small objects are gravitationally influenced by two larger orbiting bodies. These points are solutions to the restricted three-body problem.

Night: Night is the time from sunset to sunrise when it is dark outside because the Sun is below the horizon. The duration of night depends on the location, season, and latitude.

Orbital mechanics: Orbital mechanics, also known as astrodynamics, applies ballistics and celestial mechanics to solve practical problems related to the motion of spacecraft. Using Newton's laws of motion and the law of universal gravitation, it calculates the trajectory of rockets, satellites, and other objects in space. This discipline is crucial for designing and controlling space missions.

Escape velocity: Escape velocity is the minimum speed required for an unpowered object to break free from the gravitational pull of a central body. It is independent of direction and ignores atmospheric friction. The speed depends on the mass of the central body and decreases with distance traveled. Once an object reaches escape velocity, it does not require further acceleration to escape, but will continuously slow down due to the gravitational force.

Geostationary orbit: A geostationary orbit is a high-altitude circular orbit above Earth's equator that follows the direction of Earth's rotation. It is located 35,786 km in altitude and 42,164 km in radius from Earth's center. It is also known as a geosynchronous equatorial orbit (GEO).

Geosynchronous orbit: A geosynchronous orbit is a type of orbit around the Earth where the object takes the same amount of time as Earth's rotation, about 24 hours, to complete one orbit. This means the object appears to stay in the same position in the sky from Earth's surface. The path of the object can be still or follow a figure-8 shape, depending on the inclination and eccentricity of the orbit. A circular geosynchronous orbit is at a fixed altitude of 35,786 km (22,236 mi).

Gravity assist: Gravity assist is a spaceflight maneuver that utilizes the gravity and movement of planets or other celestial objects to alter a spacecraft's path and speed. This technique helps conserve propellant and reduce expenses.

Low Earth orbit: A Low Earth Orbit (LEO) is a relatively close orbit around Earth with a short period and low ellipticity. Most man-made objects in space are found in LEO, at altitudes up to about one-third of Earth's radius.

Celestial sphere: The celestial sphere is an abstract sphere that encompasses the sky, with all objects appearing as if projected onto its inner surface. It can be centered either on Earth or the observer, resembling a hemispherical screen over the observer's location. This concept is used in astronomy and navigation.

Constellation: A constellation is a group of visible stars that form a pattern on the celestial sphere, often representing animals, mythological subjects, or inanimate objects.

Astronomical coordinate systems: Astronomical coordinate systems are used in astronomy to determine the positions of celestial objects. These systems can specify positions in three-dimensional space or simply the direction on a celestial sphere. They are based on physical reference points available to observers.

Equatorial coordinate system: The equatorial coordinate system is a widely used method to locate celestial objects. It can be defined in spherical or rectangular coordinates, with an origin at Earth's center, a fundamental plane aligned with Earth's equator projected onto the celestial sphere, a primary direction pointing towards the vernal equinox, and a right-handed convention.

Equinox: An equinox is a solar event when the Sun appears directly above the Earth's equator. This happens twice a year, around March 20 and September 23. On these days, the Sun rises and sets exactly in the east and west directions.

Ecliptic: The ecliptic, or orbital plane of Earth around the Sun, is a significant reference plane in astronomy. As the Earth orbits the Sun, the Sun's apparent yearly movement against the backdrop of stars creates the path of the ecliptic. It serves as the foundation for the ecliptic coordinate system, a crucial tool for celestial observations.

Horizon: The horizon is the visible line that appears to separate the sky from the surface of a celestial body when viewed from an observer's perspective. It divides viewing directions based on whether they intersect the body's surface or not.

Solstice: A solstice is when the Sun reaches its farthest point from the celestial equator. It happens twice a year, around June 21 and December 21. Solstices determine seasons in many countries.

Zodiac: The Zodiac is a belt-shaped region in the sky, about 8° north and south of the ecliptic - the Sun's apparent path throughout the year. It contains the orbital paths of the Moon and major planets.

Canis Major: Canis Major is a southern constellation that was included in Ptolemy's 48 constellations. Its name means "greater dog" in Latin. It is often depicted following Orion the hunter in the sky. The Milky Way intersects with Canis Major and it contains various open clusters, including the notable M41 cluster.

Cassiopeia (constellation): Cassiopeia is a constellation in the northern sky named after a vain queen in Greek mythology. It is one of the 88 modern constellations and was listed by the Greek astronomer Ptolemy. Recognizable by its distinctive 'W' shape, formed by five bright stars.

Centaurus: Centaurus is a renowned constellation in the southern sky, ranking among the largest constellations. It has a significant mythological association with the centaur, a half-human, half-horse creature. Noteworthy stars within Centaurus include Alpha Centauri, the closest star system to our Solar System, as well as Beta Centauri and V766 Centauri, one of the largest stars ever observed. Additionally, Omega Centauri, a remarkable globular cluster, shines as the brightest and largest one in our Milky Way, potentially originating from a dwarf galaxy.

Crux: Crux is a small constellation in the southern sky known as the Southern Cross. It contains four bright stars forming a cross shape and is located at the end of the visible Milky Way. The name Crux means cross in Latin. Despite its size, Crux stands out because its main stars are relatively bright. It holds great cultural significance in many countries of the Southern Hemisphere.

Orion (constellation): Orion is a famous constellation known for its prominent stars visible in the winter sky. It is one of the 88 modern constellations and was listed by the ancient astronomer Ptolemy. This constellation takes its name from Orion, a character in Greek mythology known for being a hunter.

Ursa Major: Ursa Major is a constellation in the northern sky, associated with ancient mythology. Its Latin name means "greater bear" as opposed to Ursa Minor, the lesser bear. It was among the 48 original constellations listed by Ptolemy in the 2nd century AD, based on the observations of ancient astronomers. Currently, it ranks as the third largest constellation out of the 88 recognized today.

Ursa Minor: Ursa Minor, or Little Bear, is a constellation in the northern sky. It has seven stars, four of which make up its bowl-like shape, resembling a ladle. This constellation was identified by Ptolemy and is still recognized today. Ursa Minor is important for navigation due to Polaris, the north pole star.

Planet: A planet is a large astronomical body that forms from interstellar clouds and grows through material accumulation. The Solar System has eight planets, including terrestrial and giant ones. Planets rotate around an axis and possess atmospheres, ice caps, seasons, and natural satellites. They also have magnetic fields, except for Venus and Mercury. The giant planets have planetary rings, with Saturn's rings being the most prominent.

Terrestrial planet: Terrestrial planets, also known as rocky planets, are primarily composed of silicate rocks or metals. In our Solar System, the inner planets Mercury, Venus, Earth, and Mars are considered terrestrial planets. Some astronomers include Earth's Moon, Io, and occasionally Europa, while the asteroids Pallas and Vesta are rarely considered. The term "terrestrial planet" is derived from Latin words for Earth, emphasizing their Earth-like structure. These planets are extensively studied by geologists, astronomers, and geophysicists.

Giant planet: Giant planets are significantly larger than Earth and consist mainly of low-boiling point materials. While typically not composed of solid matter, solid giant planets do exist. In our Solar System, the known giant planets are Jupiter, Saturn, Uranus, and Neptune. Additionally, numerous giant planets have been discovered beyond our Solar System orbiting different stars.

Exoplanet: An exoplanet is a planet located outside our Solar System. Possible evidence of exoplanets was observed in 1917, but the first confirmed detection occurred in 1992. Currently, there are 5,576 confirmed exoplanets in 4,113 planetary systems, with some systems having multiple planets. The James Webb Space Telescope is expected to unveil more exoplanets and provide valuable insights into their composition, environmental conditions, and potential for supporting life.

Atmosphere: An atmosphere is a layer of gas surrounding a planet, held by gravity. It remains when gravity is strong and temperature is low. Stellar atmospheres include regions above the photosphere, while cool stars may have atmospheres with compound molecules.

Ring system: A ring system is a disk composed of dust and moonlets that orbits an astronomical object, commonly found around giant planets like Saturn. It is also known as a planetary ring system.

Minor planet: A minor planet is an object in orbit around the Sun, distinct from planets and comets. They were reclassified into dwarf planets and small Solar System bodies in 2006 by the International Astronomical Union.

Asteroid: An asteroid is a minor planet without an atmosphere that orbits the inner Solar System. They come in various sizes, from meter-sized rocks to dwarf planets nearly 1000 km wide. Asteroids can be rocky, metallic, or icy in composition.

Dwarf planet: A dwarf planet is a small object orbiting the Sun, rounded by gravity but lacking the dominance of the eight classical planets. Pluto is the prototypical dwarf planet, once considered a planet before the concept changed in 2006.

Natural satellite: A natural satellite is an astronomical body that orbits a planet or other celestial object. They are commonly known as moons, like the Moon of Earth.

Comet: A comet is a small Solar System body that warms and releases gases when it approaches the Sun, creating an extended atmosphere called a coma and sometimes a tail of gas and dust. These effects are caused by solar radiation and the solar wind acting upon the comet's icy nucleus composed of ice, dust, and rocks. Comets can be seen from Earth without a telescope if they are close and bright enough, and they have been observed and recorded since ancient times.

Meteoroid: A meteoroid is a small rock or metal object in space, smaller than an asteroid. They range in size from tiny grains to objects up to one meter wide. Meteoroids are typically fragments from comets or asteroids, but some are debris ejected from the Moon or Mars due to collisions. Micrometeoroids or space dust are smaller than meteoroids.

Meteor shower: A meteor shower is when meteors appear to radiate from a single point in the night sky. They are caused by cosmic debris entering Earth's atmosphere at high speeds. Most meteors disintegrate before hitting the Earth. Intense showers, called meteor outbursts or storms, can produce over 1,000 meteors an hour. The Leonids are a notable example. There are over 900 suspected meteor showers, with about 100 well established. Viewing opportunities are available online, including NASA's daily map of active showers.

Impact event: An impact event is a collision between astronomical objects. They have physical consequences and are common in planetary systems, usually involving asteroids, comets, or meteoroids. Large impacts on terrestrial planets like Earth can have significant physical and biospheric effects, but atmospheres help reduce surface impacts. Impact craters and structures are prevalent in the Solar System, providing strong evidence of their frequency and scale.

Albedo: Albedo is the amount of sunlight that a body reflects, measured from 0 to 1.

Star: A star is a self-gravitating luminous object made of plasma. The Sun is the closest star to Earth. While many stars can be seen with the naked eye, their distance makes them appear as fixed points of light. Prominent stars are categorized into constellations and asterisms and often have proper names. Astronomers create star catalogues to identify and classify known stars. The observable universe contains an estimated 1-10 trillion trillion stars, with only about 4,000 visible to the naked eye within the Milky Way galaxy.

Variable star: A variable star is a star that exhibits changes in its brightness over time. These changes can be caused by either the star itself changing in luminosity or by something obstructing the light reaching Earth, such as an orbiting companion.

Nova: A nova is an astronomical event where a bright new star suddenly appears but then gradually fades over weeks or months. Novae are caused by specific circumstances between two stars, typically involving white dwarfs in close binary systems. There are three main sub-classes of novae: classical novae, recurrent novae, and dwarf novae. These events are categorized as cataclysmic variable stars.

Cepheid variable: A Cepheid variable is a type of star that pulsates in size and temperature. It shows predictable changes in brightness with a stable period and amplitude.

Star system: A star system consists of a few stars that orbit each other due to gravitational attraction. It is distinct from planetary systems, which include planets and other bodies. Star clusters and galaxies are examples of larger groups of stars bound by gravity.

Planetary system: A planetary system is a collection of objects that are held together by gravity and orbit around a star. It typically includes planets, but can also contain other celestial bodies like dwarf planets, asteroids, satellites, comets, and disks. The Solar System, consisting of the Sun and the objects orbiting around it, is an example of a planetary system. Similar systems outside our Solar System are referred to as exoplanetary systems.

Binary star: A binary star is a system of two stars that orbit around each other. Some binary stars can appear as a single star in the sky, but can be resolved using a telescope. Binary stars can have long orbital periods and their orbits may be uncertain. They can be detected through spectroscopy or astrometry. If a binary star is in a plane along our line of sight, the components can eclipse and transit each other, known as eclipsing binaries. Some binary stars also change brightness as they orbit, called photometric binaries.

Star cluster: Star clusters are groups of stars held together by gravity. There are two main types: globular clusters, which are tight groups of old stars, and open clusters, which are looser groups of younger stars. Open clusters can be disrupted over time by giant molecular clouds, but the stars within them continue to move in the same general direction and are called stellar associations or moving groups.

White dwarf: A white dwarf is a dense remnant of a star's core, made up of electron-degenerate matter. It has a similar mass to the Sun but has a much smaller volume, similar to the Earth's. White dwarf's low brightness is due to the release of residual thermal energy, as no fusion occurs. The closest known white dwarf is Sirius B, located 8.6 light-years away. Among the hundred star systems nearest to the Sun, there are believed to be eight white dwarfs. The dimness of white dwarfs was initially observed in 1910, and the term "white dwarf" was coined in 1922 by Willem Luyten.

Neutron star: A neutron star is the collapsed core of a massive supergiant star. They are the smallest, densest known class of stellar objects, except for black holes. Neutron stars have a radius of about 10 kilometers and a mass of approximately 1.4 solar masses. They form from supernova explosions and gravitational collapse, reaching densities similar to atomic nuclei.

Pulsar: A pulsar is a rapidly spinning neutron star that emits beams of radiation from its magnetic poles. These beams are only visible when they face Earth, resulting in a pulsed appearance. Pulsars have dense bodies and consistent rotation, creating precise intervals between pulses. They are considered as possible sources of ultra-high-energy cosmic rays.

Stellar classification: Stellar classification is the categorization of stars based on their spectral characteristics. By analyzing the electromagnetic radiation emitted by a star through a prism or diffraction grating, its spectrum reveals distinct colors and spectral lines that correspond to specific chemical elements or molecules. These lines' strengths indicate the abundance of elements, mainly influenced by the star's photosphere temperature. A star's spectral class is a concise code summarizing its ionization state, providing an objective measure of the photosphere's temperature.

Main sequence: The main sequence is a grouping of stars that form a distinct band on plots of stellar color versus brightness. These stars, also known as dwarf stars, represent the most common type of stars in the universe, including the Sun. Their position on this band provides insights into their physical properties and their progression through various stages of their life cycle. Hertzsprung–Russell diagrams, named after Hertzsprung and Russell, are used to depict this relationship between color and brightness.

Giant star: A giant star is larger and brighter than a main-sequence star with the same surface temperature. They are located above the main sequence on the Hertzsprung–Russell diagram and are classified as luminosity classes II and III. The terms giant and dwarf were coined by Ejnar Hertzsprung in 1905 for stars with different luminosities but similar temperatures.

Red giant: A red giant is a large, luminous star in a late phase of evolution with an inflated and tenuous atmosphere. It has a low to intermediate mass and a surface temperature of around 5,000 K or lower. Red giants have a yellow-white to reddish-orange appearance and can be classified as spectral types K, M, G, S, and carbon stars.

Supergiant: Supergiants are extremely massive and luminous stars that exist in the top region of the Hertzsprung–Russell diagram. They have absolute visual magnitudes ranging between approximately -3 and -8. Supergiant stars exhibit a temperature range of 3,400 K to over 20,000 K.

Wolf–Rayet star: Wolf–Rayet stars, or WR stars, are rare stars with unique spectra displaying broad emission lines of ionised helium and highly ionised nitrogen or carbon. They exhibit high surface enhancement of heavy elements, depletion of hydrogen, and strong stellar winds. With surface temperatures ranging from 20,000 K to around 210,000 K, they are hotter than most other stars. These stars were previously known as W-type stars based on their spectral classification.

Stellar evolution: Stellar evolution refers to the process of how a star changes over time. Different star masses have varying lifetimes, from millions to trillions of years. Stars are formed from collapsing gas and dust clouds, eventually settling into a stable state known as a main-sequence star.

Star formation: Star formation is the process of dense regions collapsing within interstellar space to create stars. It involves studying the interstellar medium and giant molecular clouds as precursors, as well as protostars and young stellar objects as immediate products. It is closely connected to planet formation and also considers binary stars and the initial mass function. Star clusters and stellar associations are common outcomes.

Starburst galaxy: A starburst galaxy is characterized by an extremely high rate of star formation, exceeding that of most other galaxies. The star formation rate in these galaxies can reach 100 times or more the rate of our Milky Way. This rapid star formation depletes the galaxy's gas supply, leading to a short-lived phase in its evolution. Starburst galaxies are often associated with mergers or close encounters with other galaxies. Examples of starburst galaxies include M82, NGC 4038/NGC 4039, and IC 10.

Protostar: A protostar is a young star that acquires mass from its parent molecular cloud. This phase marks the early stage of stellar evolution, lasting approximately 500,000 years for low-mass stars. It begins when a molecular cloud fragment collapses, creating an opaque, pressure-supported core. The protostar phase concludes when the incoming gas is exhausted, resulting in a pre-main-sequence star that later contracts to become a main-sequence star through hydrogen fusion and helium production.

Stellar kinematics: Stellar kinematics is the study of star motion in space. It involves observing and measuring the movement of stars.

Stellar magnetic field: A stellar magnetic field is generated by the motion of conductive plasma within a star. This motion is driven by convection, where material physically moves to transport energy. The localized magnetic field exerts a force on the plasma, increasing pressure without density. Magnetized regions rise to the star's surface, creating starspots and coronal loops.

Stellar structure: Stellar structure models predict a star's internal makeup and behavior, encompassing elements like luminosity, color, and future evolution. Diverse classes and ages of stars exhibit distinct internal structures, influenced by elemental composition and energy transport mechanisms.

Metallicity: Metallicity refers to the amount of elements in an object that are heavier than hydrogen and helium. In astronomy, "metals" is used as a term to describe all elements except hydrogen and helium. This is different from the traditional definition of a metal. Objects with high abundances of heavier elements are called "metal-rich" in astrophysics, despite some elements being nonmetals in chemistry.

Brown dwarf: Brown dwarfs are objects that have more mass than gas giants but less than stars. They are about 13 to 80 times the mass of Jupiter and cannot sustain nuclear fusion. However, they emit light and heat from the fusion of deuterium and some can even fuse lithium.

Hertzsprung–Russell diagram: The Hertzsprung-Russell diagram is a plot comparing stars' absolute magnitudes or luminosities with their classifications or temperatures. It was independently created in 1911 and 1913 by Hertzsprung and Russell, respectively. This diagram played a significant role in advancing our understanding of stellar evolution.

Planetary nebula: A planetary nebula is a glowing shell of ionized gas that is emitted from red giant stars during the later stages of their lives. It is a type of emission nebula found in space.

Supernova: A supernova is a massive explosion that occurs when a star collapses or undergoes runaway nuclear fusion. It results in the formation of a neutron star or black hole, or the complete destruction of the star. Supernovae exhibit extremely bright optical luminosity, comparable to entire galaxies, before gradually fading over weeks or months.

Gamma-ray burst: Gamma-ray bursts (GRBs) are extremely powerful explosions observed in distant galaxies. They are the most energetic events since the Big Bang, emitting gamma rays and a longer-lasting afterglow. GRBs can last from milliseconds to hours and are the most powerful class of explosions in the universe, according to NASA.

Outer space: Outer space is the vast expanse beyond celestial bodies and their atmosphere. It is not empty, but instead contains a low density of particles such as hydrogen, helium, electromagnetic radiation, magnetic fields, neutrinos, dust, and cosmic rays. Its baseline temperature, set by the background radiation from the Big Bang, is 2.7 kelvins.

Galaxy: A galaxy is a system of stars, gas, dust, and dark matter held together by gravity. The term comes from the Greek word for "milky," referring to our own Milky Way galaxy. Galaxies vary greatly in size, from dwarfs to supergiants with trillions of stars. Most of a galaxy's mass is in the form of invisible dark matter. Supermassive black holes are frequently found at galaxy centers.

Galaxy formation and evolution: The study of how galaxies form and change over time, including the variety of structures observed. This occurs through processes like clustering, merging, and the accumulation of mass. It is hypothesized to be influenced by quantum fluctuations after the Big Bang. Hydrodynamics simulation is commonly used to study this.

Black hole: A black hole is a region in space where gravity is incredibly strong, not allowing anything, including light, to escape. It forms when a mass becomes compact enough, deforming spacetime. The boundary where nothing can escape is called the event horizon. Black holes have no detectable features and act like ideal black bodies, reflecting no light. Additionally, they emit Hawking radiation with a temperature inversely proportional to their mass, making direct observation practically impossible.

Supermassive black hole: A supermassive black hole is the largest kind of black hole, with a mass millions to billions of times that of the Sun. These objects are formed from the gravitational collapse of massive stars and are found at the center of most large galaxies, including our own Milky Way. They are incredibly powerful, attracting and devouring interstellar gas, which fuels the intense energy emissions from active galactic nuclei and quasars.

Event horizon: An event horizon is a boundary in astrophysics that marks the point beyond which events are no longer observable to an observer. Coined by Wolfgang Rindler in the 1950s.

Interstellar medium: The interstellar medium (ISM) is the matter and radiation present in the space between star systems in a galaxy. It consists of gas in different forms, dust, cosmic rays, and electromagnetic radiation. The ISM fills the space between galaxies as well. Despite low atomic density, collisions between particles are frequent, making it behave like a gas and responding to pressure forces.

Nebula: A nebula is a glowing part of the space between stars, consisting of hydrogen, cosmic dust, and other materials. Nebulae often form new stars and planetary systems by gathering gas and dust into dense regions. These regions eventually become stars, while the remaining material forms planets and other celestial objects.

Dark nebula: A dark nebula is a dense interstellar cloud that blocks visible light from objects behind it. It is made up of interstellar dust grains found in the coldest parts of molecular clouds. Clusters of dark nebulae are linked to Giant Molecular Clouds, while small isolated ones are known as Bok globules. Radio waves and infrared astronomy are used to observe objects hidden by dark nebulae.

Molecular cloud: A molecular cloud, also known as a stellar nursery, is a dense and large interstellar cloud that allows for the formation of molecules, primarily molecular hydrogen (H2), and the creation of absorption nebulae and H II regions. It is distinct from other regions in the interstellar medium that primarily contain ionized gas.

H II region: An H II region is a ionized region of interstellar hydrogen found in molecular clouds. It ranges in size from one to hundreds of light years and has a density of about a million particles per cubic centimeter. The Orion Nebula, discovered in 1610, is an example of an H II region.

Cosmic ray: Cosmic rays are high-energy particles traveling close to the speed of light. They come from various sources, including the Sun, our galaxy, and distant galaxies. When they collide with Earth's atmosphere, cosmic rays create showers of secondary particles. While some particles reach the surface, most are redirected away from Earth by the magnetosphere or heliosphere.

Galaxy groups and clusters: Galaxy groups and clusters are the densest part of the Universe's large-scale structure. They are the largest gravitationally bound objects formed during cosmic structure formation. These clusters, formed relatively recently, contain ten to thousands of galaxies and are associated with larger non-gravitationally bound superclusters.

Supercluster: A supercluster is a massive aggregation of smaller galaxy clusters or groups, making them some of the largest structures in the universe. The Milky Way is part of the Local Group, which belongs to the Virgo Supercluster, itself part of the even larger Laniakea Supercluster in the Pisces–Cetus Complex. Superclusters expand with the Hubble expansion due to their large size and low density. It is estimated that there are about 10 million superclusters in the observable universe.

Void (astronomy): Cosmic voids are vast spaces in astronomy that have very few or no galaxies. Most galaxies are not found in voids because they are gravitationally bound together in large structures called galaxy filaments. The evolution of void regions differs from that of the Universe as a whole, with a long stage dominated by curvature that hinders the formation of galaxy clusters and massive galaxies. Even though voids contain over 15% of the average matter density of the Universe, they appear nearly empty to an observer.

Galaxy morphological classification: Galaxy morphological classification is a method astronomers use to categorize galaxies based on their visual appearance. The most well-known system is the Hubble sequence, developed by Edwin Hubble and expanded by Gérard de Vaucouleurs and Allan Sandage. Today, computational methods and physical morphology play a significant role in classifying galaxies.

Spiral galaxy: A spiral galaxy is a type of galaxy that was first described by Edwin Hubble in 1936. It consists of a flat disk containing stars, gas, and dust, with a central concentration of stars called the bulge. Spiral galaxies also have a fainter halo of stars around them, including globular clusters.

Barred spiral galaxy: A barred spiral galaxy is a type of spiral galaxy that has a bar-shaped structure made up of stars at its center. These bars are present in about two thirds of all spiral galaxies in our local universe and have an impact on the movement of stars and interstellar gas, as well as the formation of spiral arms. Our own Milky Way Galaxy, home to the Solar System, falls into this category.

Elliptical galaxy: An elliptical galaxy is a smooth, ellipsoidal-shaped galaxy with few distinct features. It is one of the four main types of galaxies described by Edwin Hubble. Along with spiral and lenticular galaxies, they are part of the "early-type" galaxy population.

Lenticular galaxy: A lenticular galaxy is a type of galaxy that lies between an elliptical and a spiral galaxy. It has a large-scale disc but lacks spiral arms. Lenticular galaxies have little ongoing star formation due to the depletion of interstellar matter, although they may retain dust in their discs. They are primarily composed of aging stars. Despite their morphological differences, lenticular and elliptical galaxies share common properties and can be considered early-type galaxies undergoing passive evolution. They are connected to S0 galaxies through ES galaxies that possess intermediate-scale discs.

Irregular galaxy: An irregular galaxy lacks a defined shape unlike the spiral or elliptical galaxies. They are not classified under the Hubble sequence and appear chaotic with no central bulge or spiral arms.

Dwarf galaxy: A dwarf galaxy is a small galaxy with up to several billion stars, compared to the Milky Way's 200-400 billion stars. The Large Magellanic Cloud, sometimes classified as a dwarf galaxy, orbits the Milky Way and contains over 30 billion stars. Dwarf galaxies' formation and activity are influenced by interactions with larger galaxies. Astronomers categorize dwarf galaxies based on shape and composition.

Active galactic nucleus: An active galactic nucleus (AGN) is a compact region in the center of a galaxy that emits a significant amount of energy across various wavelengths. This excess radiation, not produced by stars, is likely caused by a supermassive black hole accreting matter. AGNs are found in active galaxies.

Seyfert galaxy: Seyfert galaxies are active galaxies, similar to quasars, with bright nuclei and high-ionization emission lines in their spectra. Unlike quasars, Seyfert galaxies have detectable host galaxies.

Radio galaxy: A radio galaxy is a galaxy that emits giant regions of radio waves extending beyond its visible structure. These radio emissions are powered by jets from its active galactic nucleus, with luminosities reaching up to 1039 W. The radio emission is a result of the synchrotron process, and the observed structure is influenced by the interaction between twin jets and the surrounding medium, affected by relativistic beaming. These galaxies are typically large elliptical galaxies and are valuable for studying cosmology due to their detectability at large distances. Their effects on the intergalactic medium, particularly in galaxy groups and clusters, have been extensively researched.

Quasar: A quasar, also known as a quasi-stellar object (QSO), is an extremely bright active galactic nucleus (AGN). It is powered by a supermassive black hole, surrounded by a gaseous accretion disc. The disc releases enormous amounts of energy in the form of electromagnetic radiation. Most quasars have luminosities thousands of times greater than the Milky Way. They are a subclass of AGN and their redshifts are cosmological in origin.

Blazar: A blazar is an active galactic nucleus that appears bright due to a relativistic jet pointed towards Earth. It emits high-energy gamma ray photons and shows rapid fluctuations in brightness. Some blazar jets exhibit superluminal motion as they travel at nearly the speed of light towards observers.

Physical cosmology: Physical cosmology is a branch of science that studies cosmological models to understand the structure, dynamics, origin, evolution, and fate of the universe. It emerged from the Copernican principle and Newtonian mechanics, which helped understand the laws governing celestial bodies.

Universe: The universe is all of space and time, including everything that exists from sub-atomic particles to galaxies. It emerged from the Big Bang about 13.787 billion years ago and has been expanding ever since. The observable universe is about 93 billion light-years in diameter, but the size of the entire universe is unknown.

Observable universe: The observable universe is a region of space containing all matter that can be seen from Earth or its telescopes. It forms a spherical shape and includes objects whose light has reached Earth since the expansion of the universe began. It was initially speculated to have 2 trillion galaxies, but recent data suggests several hundred billion. This spherical region is centered on the observer, and every location in the universe has its own observable universe which can overlap with Earth's perspective.

Chronology of the universe: The chronology of the universe is a description of its history and future based on Big Bang cosmology. It provides insights into the formation and development of the universe since its birth.

Big Bang: The Big Bang is a theory that explains the expansion of the universe from a dense and hot initial state. Proposed by Georges Lemaître in 1927, it offers comprehensive explanations for various observed phenomena. These include the abundance of light elements, the cosmic microwave background radiation, and the large-scale structure of the universe. Cosmic inflation helps explain the overall uniformity of the universe. However, the earliest conditions of the Big Bang lack a widely accepted theory of quantum gravity.

Inflation (cosmology): Cosmic inflation, or just inflation, is a theory in cosmology that explains the rapid expansion of space in the early universe. This inflationary epoch lasted from 10−36 seconds to between 10−33 and 10−32 seconds after the Big Bang. After inflation, the universe continued to expand at a slower rate until the acceleration caused by dark energy, which occurred over 7.7 billion years later.

Ultimate fate of the universe: The ultimate fate of the universe refers to the possible outcomes of its evolution. This topic in physical cosmology explores different scenarios and evaluates them based on observational evidence. It is a valid cosmological question that goes beyond mythological or theological beliefs. Scientists propose various hypotheses, including finite and infinite durations for the universe, to explain its beginning and future.

Cosmic microwave background: The cosmic microwave background is a faint glow of microwave radiation that fills all of space in the observable universe. It provides valuable information about the early universe and was accidentally discovered in 1965 by radio astronomers Arno Penzias and Robert Wilson.

Dark matter: Dark matter is a hypothetical form of matter in astronomy that doesn't interact with light or electromagnetic fields. It is inferred from gravitational effects that cannot be explained by general relativity with the visible matter alone. These effects are observed in the formation and evolution of galaxies, gravitational lensing, galactic collisions, galaxy cluster motion, and cosmic microwave background anisotropies.

Dark energy: Dark energy is an unknown energy that drives the expanding universe. It makes up 68% of the universe's total energy, while dark matter and ordinary matter contribute 26% and 5%. Despite its low density, dark energy dominates the universe due to its uniformity throughout space.

Cosmological constant: The cosmological constant, also known as Einstein's cosmological constant, is a coefficient that Einstein added temporarily to his equations of general relativity but later removed. It was then rediscovered as the energy density of space or vacuum energy, which is related to the concept of dark energy in quantum mechanics.

Redshift: Redshift refers to the increase in wavelength and decrease in frequency and energy of electromagnetic radiation. This change is opposite to blueshift. Redshift is caused by relative motion of sources and gravitational potentials. It is seen in all distant light sources, indicating the expansion of the universe.

Hubble's law: Hubble's Law states that galaxies are receding from us at speeds proportional to their distance, meaning the farther the galaxy, the faster it is moving away. The velocity of galaxies is found through their redshift, a shift of emitted light towards the red end of the visible spectrum.

Chemistry: Chemistry is the study of matter, its properties, behavior, composition, and changes during reactions. It explores elements, compounds, atoms, molecules, ions, and chemical bonds.

Alchemy: Alchemy is an ancient, philosophical tradition practiced in China, India, the Muslim world, and Europe. It emerged in Greco-Roman Egypt during the first few centuries AD.

Analytical chemistry: Analytical chemistry employs techniques to separate, identify, and measure substances in order to determine their composition. This field covers both qualitative analysis for identifying substances and quantitative analysis for determining their amount or concentration.

Environmental chemistry: Environmental chemistry is the study of chemical and biochemical processes in natural environments, with a focus on understanding the sources, reactions, transport, effects, and fates of chemical species in the air, soil, and water. It examines the impact of both human and biological activities on these processes. This interdisciplinary field incorporates atmospheric, aquatic, and soil chemistry, relying heavily on analytical chemistry and its connection to environmental and other scientific disciplines.

Inorganic chemistry: Inorganic chemistry focuses on the behavior and synthesis of compounds that are not carbon-based. While it overlaps with organic chemistry in organometallic chemistry, it has diverse applications in areas like catalysis, materials science, pigments, medications, fuels, and agriculture.

Organic chemistry: Organic chemistry is a branch of chemistry that studies the structure, properties, and reactions of compounds containing carbon atoms. It includes analyzing their structural formula, physical and chemical properties, and behavior. This field involves synthesizing natural products, drugs, and polymers, as well as studying individual organic molecules in labs and through theoretical research.

Medicinal chemistry: Medicinal chemistry combines chemistry and pharmacy to create and improve drugs. It involves discovering and creating new chemicals for medical purposes, as well as studying the properties of existing drugs and their effects on the body.

Organometallic chemistry: Organometallic chemistry is the study of compounds that have at least one bond between a carbon atom of an organic molecule and a metal. It includes alkali, alkaline earth, and transition metals, as well as metalloids. Compounds with bonds to inorganic carbon are also considered organometallic. Some related compounds, such as metal hydrides and metal phosphine complexes, are often discussed in relation to organometallic compounds. Metalorganic compounds are similar but lack direct metal-carbon bonds, instead having organic ligands. Organometallic chemistry combines aspects of inorganic and organic chemistry.

Physical chemistry: Physical chemistry is the branch of science that investigates chemical systems using the principles of physics. It analyzes both large and small-scale phenomena, exploring motion, energy, force, time, thermodynamics, quantum chemistry, statistical mechanics, dynamics, and chemical equilibria.

Electrochemistry: Electrochemistry studies the connection between electrical potential difference and chemical change. It involves electron movement between electrodes through an electrolyte as reactions take place.

Nuclear chemistry: Nuclear chemistry deals with radioactivity, nuclear processes, and transformations in atomic nuclei. It encompasses nuclear transmutation and properties of nuclei.

Photochemistry: Photochemistry is a branch of chemistry that studies the effects of light on chemicals. It refers to reactions triggered by the absorption of ultraviolet, visible, or infrared radiation.

Quantum chemistry: Quantum chemistry applies quantum mechanics to study chemical systems, calculating electronic contributions to properties of molecules, materials, and solutions. It uses approximations to make computations practical while capturing important information about wave functions and observable properties. It also investigates quantum effects on molecular dynamics and chemical kinetics.

Materials science: Materials science is an interdisciplinary field that researches and discovers new materials. Materials engineering, on the other hand, focuses on finding practical applications for these materials in various industries.

Polymer chemistry: Polymer chemistry is a branch of chemistry that studies the structures, synthesis, and properties of polymers and macromolecules. It connects various sub-disciplines like organic, analytical, and physical chemistry. Polymer chemistry encompasses both synthetic and organic compositions, playing a crucial role in materials like plastics and rubbers. It is closely related to polymer science, nanotechnology, polymer physics, and polymer engineering.

Chemical bond: A chemical bond is a lasting attraction between atoms or ions that enables the formation of molecules and other structures. It can be formed through the electrostatic force between oppositely charged ions (ionic bond) or the sharing of electrons (covalent bond). Chemical bonds can be strong (covalent, ionic, metallic) or weak (dipole-dipole, London dispersion, hydrogen bonding).

Covalent bond: A covalent bond is a chemical bond formed when atoms share electrons, resulting in stable attractive and repulsive forces. It allows atoms to attain a stable electronic configuration, commonly seen in organic chemistry.

Hydrogen bond: A hydrogen bond is an electrostatic attraction between a hydrogen atom and an electronegative atom with lone pair of electrons. It is represented as Dn−H···Ac, where Dn is the donor atom and Ac is the acceptor atom. The most common atoms involved are nitrogen, oxygen, and fluorine.

Ionic bonding: Ionic bonding is a chemical bond formed through the attraction between oppositely charged ions. It occurs between atoms with significantly different electronegativities, leading to the creation of ionic compounds. This type of bonding involves the transfer of electrons, resulting in negatively charged ions for electron gain and positively charged ions for electron loss. The cation is typically a metal atom, while the anion is a nonmetal atom. However, ions can be more complex, like molecular ions. In simple terms, ionic bonds occur when electrons are transferred from a metal to a non-metal, allowing both atoms to achieve a full outer electron shell.

Metallic bonding: Metallic bonding is a chemical bonding between conduction electrons and metal ions, resulting in the sharing of free electrons among positively charged ions. This type of bonding explains various physical properties of metals including strength, ductility, thermal and electrical conductivity, opacity, and lustre.

Mixture: In chemistry, a mixture is a combination of different substances without chemical bonding. It retains the identities of its components and can exist in the form of solutions, suspensions, or colloids.

Dispersion (chemistry): Dispersion in chemistry refers to a system where particles of one substance are spread throughout another substance, which can be in the same or different state.

Colloid: A colloid is a mixture of insoluble particles suspended in another substance. It can include liquids, aerosols, and gels. The overall mixture is called a colloidal suspension. The dispersed phase particles have a size range of approximately 1 nanometre to 1 micrometre.

Aerosol: An aerosol is a mixture of fine solid particles or liquid droplets suspended in air or gas. It can be natural or caused by human activity. Examples of natural aerosols include fog, dust, and steam, while anthropogenic aerosols include pollutants, perfume, and medical treatments. Inhaling the contents of a vape pen or e-cigarette means inhaling an anthropogenic aerosol.

Emulsion: An emulsion is a mixture of normally immiscible liquids, where one liquid is dispersed in the other. It is part of a broader category of two-phase systems known as colloids. Emulsions are used to describe mixtures with both dispersed and continuous liquid phases. Examples of emulsions include vinaigrettes, homogenized milk, biomolecular condensates, and certain cutting fluids.

Foam: Foam refers to materials comprising gas trapped in a liquid or solid.

Gel: A gel is a semi-solid substance that can vary in softness and hardness. It is a dilute cross-linked system that does not flow in a steady state but allows diffusion of liquid. A gel is a soft or solid-like material composed of two or more components, one being a significant amount of liquid.

Solution (chemistry): A solution is a homogeneous mixture of substances where a solute is dissolved in a solvent. The solvent particles separate the solute particles and surround them, allowing them to move freely. The process of mixing a solution involves specific interactions due to polarity. Concentration is an important parameter, measuring the amount of solute in the solution. An aqueous solution refers to a solution where water is one of the solvents.

Suspension (chemistry): A suspension in chemistry refers to a mixture of a fluid and visible solid particles that are large enough to settle. The particles must be larger than one micrometer and the mixture is classified as a suspension until the particles have settled.

Periodic table: The Periodic Table is a fundamental tool in chemistry, used in various sciences, that organizes the chemical elements into rows and columns. It represents the periodic law, showing that elements' properties recur as atomic numbers increase. The table is divided into four blocks, and elements within the same group exhibit similar chemical characteristics.

Atomic mass: The atomic mass is the mass of an atom, typically expressed in daltons. It is the sum of the masses of protons and neutrons in the nucleus, while electrons and nuclear binding energy have minor contributions. The atomic mass constant allows for conversion between kilograms and daltons.

Atomic number: The atomic number (Z) is the charge number of an atomic nucleus, representing the number of protons in an element. It uniquely identifies a chemical element and is equal to the number of electrons in an uncharged atom.

Metal: Metal is a lustrous material that conducts electricity and heat well. It is also ductile and malleable due to the metallic bond between its atoms or molecules.

Metalloid: A metalloid is a chemical element exhibiting properties that are a mix of both metals and nonmetals. Although there is no universally accepted definition or consensus on which elements are metalloids, the term continues to be used in the field of chemistry.

Chemical reaction: A chemical reaction is a process that transforms one set of substances into another. It typically involves changes in electron positions, forming and breaking chemical bonds. Nuclear chemistry deals with reactions of unstable and radioactive elements, where both electronic and nuclear changes happen.

Catalysis: Catalysis is when a substance called a catalyst increases the speed of a chemical reaction. The catalyst is not used up in the reaction and remains unchanged. Even small amounts of catalyst can be effective if it recycles quickly. Factors such as mixing, surface area, and temperature influence the rate of the reaction. Catalysts react with reactants to form intermediates and regenerate the catalyst in the process.

Chemical equation: A chemical equation is a symbolic representation of a chemical reaction using formulas and symbols. It shows reactants on the left and products on the right, with a plus sign between them. The arrow indicates the direction of the reaction. The coefficients represent stoichiometric numbers, and the first chemical equation was diagrammed by Jean Beguin in 1615.

Chemical equilibrium: Chemical equilibrium is when the concentrations of reactants and products in a reaction remain constant over time, resulting in no observable changes in the system's properties. This state occurs when the forward and reverse reactions occur at the same rate, leading to no net changes in reactant and product concentrations. It is referred to as dynamic equilibrium.

Chemical synthesis: Chemical synthesis is the process of artificially creating chemical reactions to obtain one or multiple products. It involves physical and chemical manipulations, often through multiple reactions. This reproducible and reliable process is commonly used in modern laboratories.

Chemical substance: A chemical substance is a distinct form of matter with consistent chemical composition and unique properties. It can be a single element or a compound. When multiple substances are combined without reacting, they form a mixture. If a mixture is separated to isolate a specific substance, it is considered chemically pure.

Amount of substance: The amount of substance is a measure of the number of molecules, atoms, or ions in a sample of matter. It is represented by the symbol 'n' and is calculated by dividing the number of elementary entities (N) by the Avogadro constant (NA). The unit for amount of substance is the mole (mol). The Avogadro constant was recently defined as exactly 6.02214076×1023 mol−1. This measure is often referred to as the chemical amount or the "number of moles" in a sample of matter.

Chemical element: A chemical element is a substance that cannot be broken down into other substances. It consists of atoms, with the number of protons in an atom's nucleus determining the element's atomic number. Elements can combine to form molecules, while nuclear reactions can transform atoms into different elements.

Allotropy: Allotropy refers to the ability of certain elements to exist in multiple forms known as allotropes. These allotropes are distinct structural variations of the element, with different bonding arrangements. Carbon, for instance, exhibits allotropy with allotropes such as diamond, graphite, graphene, and fullerenes.

Chemical formula: A chemical formula is a way of showing the proportions of atoms in a compound using symbols and numbers. It is not a chemical name and does not contain words. Chemical formulas can give a basic idea of the structure of a compound but are not as powerful as chemical names or full structural formulas.

Chemical compound: A chemical compound is composed of identical molecules containing atoms from different elements. It is held together by chemical bonds and can undergo a chemical reaction to transform into a different substance by breaking and forming new bonds. Molecules consisting of only one element are not compounds.

Molecule: A molecule is formed when two or more atoms are bonded together by attractive forces called chemical bonds. It can include ions but is often used to refer to polyatomic ions in quantum physics, organic chemistry, and biochemistry.

Inorganic compound: An inorganic compound is a chemical compound without carbon-hydrogen bonds, also known as an organic compound. It is studied in the subfield of chemistry called inorganic chemistry.

Organic compound: An organic compound is a chemical compound that generally contains carbon–hydrogen or carbon–carbon bonds. However, some consider any compound with carbon to be organic. For instance, alkanes and their derivatives are universally recognized as organic, while certain compounds involving carbon, nitrogen, and oxygen may be considered inorganic.

Hydrogen: Hydrogen is the lightest chemical element, a colorless, odorless, and highly combustible gas. It is the most abundant substance in the universe, constituting approximately 75% of all matter. Stars like the Sun primarily consist of hydrogen in its plasma state. On Earth, hydrogen exists in molecular forms like water and organic compounds. Its most common isotope has one proton, one electron, and no neutrons.

Helium: Helium is a chemical element with atomic number 2 and symbol He. It is a colorless, odorless, and tasteless gas. As the first noble gas in the periodic table, it is inert and monatomic. Helium has the lowest boiling point and is the second-lightest element in the universe, making it abundant and constituting about 24% of the total elemental mass. Its abundance is similar in the Sun and Jupiter. Helium is a product of both nuclear fusion and radioactive decay, and its most common isotope is helium-4, formed during the Big Bang and through fusion in stars.

Alkali metal: Alkali metals are a group of chemical elements including lithium, sodium, potassium, rubidium, caesium, and francium. They are found in group 1 of the periodic table, sharing similar properties due to their outermost electron being in an s-orbital. They display consistent trends in properties and are known as the lithium family.

Lithium: Lithium is a chemical element with symbol Li and atomic number 3. It is a highly reactive and flammable alkali metal with a soft, silvery-white appearance. Being the least dense metal and solid element, it quickly corrodes in air. Though not occurring freely in nature, lithium is found in pegmatitic minerals and can be obtained from ocean water or brines. It is commonly isolated electrolytically from a mixture of lithium chloride and potassium chloride.

Sodium: Sodium is a highly reactive, silvery-white metal found in group 1 of the periodic table. It is symbolized as Na and has an atomic number of 11. Sodium is primarily obtained from compounds as it doesn't occur naturally as a free metal. It is the sixth most abundant element in the Earth's crust and is present in minerals like feldspars, sodalite, and halite. Sodium and chlorine are the most commonly dissolved elements in the oceans due to water leaching from minerals.

Potassium: Potassium (K) is a soft, silvery white metal that reacts rapidly with oxygen and water. It was first isolated from plant ashes, hence its name. As one of the alkali metals, it has a single outer electron that is easily removed, creating a positive ion. Potassium occurs naturally in ionic salts and can be found in seawater and minerals like orthoclase. When burned, it produces a distinct lilac-colored flame.

Rubidium: Rubidium is a soft, whitish-grey alkali metal with atomic number 37. It is the first alkali metal to have a density higher than water. Natural rubidium consists of two isotopes – 72% stable 85Rb and 28% slightly radioactive 87Rb, with a half-life of 48.8 billion years.

Caesium: Caesium is a soft, silvery-golden alkali metal with symbol Cs and atomic number 55. It is one of the few elemental metals that are liquid at or near room temperature. Caesium has similar properties to rubidium and potassium, but is pyrophoric and reacts with water even at extremely low temperatures. It is the least electronegative element and has just one stable isotope, caesium-133. Mined mostly from pollucite, it is also extracted as caesium-137 from nuclear reactor waste. Caesium has the largest atomic radius among all elements, measuring approximately 260 picometers.

Francium: Francium (Fr) is a highly radioactive chemical element with atomic number 87. It is the second-most electropositive element and the second rarest naturally occurring element. Its most stable isotope, francium-223, has a short half-life of 22 minutes. Francium's isotopes decay into astatine, radium, and radon. With an electronic structure of [Rn] 7s1, it is classified as an alkali metal.

Alkaline earth metal: The alkaline earth metals, which include beryllium, magnesium, calcium, strontium, barium, and radium, are a group of six elements in the periodic table. These metals share common characteristics: they are shiny, reactive, and have a silvery-white appearance at standard temperature and pressure.

Beryllium: Beryllium is a steel-gray alkaline earth metal with atomic number 4. It is strong, lightweight, and brittle. Occurring naturally in minerals, it is rare and found in gemstones like beryl. Beryllium is formed through cosmic reactions and depleted in stars. Constituting only 0.0004% of Earth's crust, its production involves a challenging extraction process from beryl.

Magnesium: Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal with low density, low melting point, and high reactivity. Found only in combination with other elements, magnesium typically has an oxidation state of +2. It reacts with air to form magnesium oxide, preventing corrosion. When ignited, it produces a bright white light. Electrolysis of magnesium salts obtained from brine is the main method of obtaining the metal. Magnesium is less dense than aluminium and is commonly used in strong and lightweight alloys alongside aluminium.

Calcium: Calcium (Ca) is a reactive alkaline earth metal with atomic number 20. It forms a dark oxide-nitride layer when exposed to air. Similar to strontium and barium, calcium's properties are both physical and chemical. It ranks as the fifth most abundant element in the Earth's crust and the third most abundant metal. The main calcium compound is calcium carbonate, found in limestone and fossils. The name calcium comes from the Latin word for lime, derived from heating limestone.

Strontium: Strontium (Sr) is a soft and reactive alkaline earth metal. It resembles calcium and barium in terms of physical and chemical properties. When exposed to air, it forms a dark oxide layer. Strontium is primarily found in the minerals celestine and strontianite and is commonly mined from these sources.

Barium: Barium (Ba) is a soft alkaline earth metal, classified as the fifth element in group 2. It has an atomic number of 56 and is highly reactive. This chemical element is never found freely in nature.

Radium: Radium is a highly radioactive chemical element (symbol Ra, atomic number 88) found in group 2 of the periodic table. It reacts with nitrogen to form a black layer of radium nitride and emits ionizing radiation during decay, causing radioluminescence. The most stable isotope, radium-226, has a half-life of 1,600 years. Radium can excite fluorescent chemicals.

Boron: Boron is a chemical element with symbol B and atomic number 5. It is a brittle, lustrous metalloid that can exist in crystalline or amorphous form. Being the lightest element in its group, it has three valence electrons, allowing it to form various compounds like boric acid and sodium borate. Boron is also known for its ultra-hard crystals like boron carbide and boron nitride.

Aluminium: Aluminium (symbol Al, atomic number 13) is a chemical element with lower density than other common metals, like steel. It forms a protective oxide layer when exposed to air and visually resembles silver. Aluminium is soft, nonmagnetic, and has a stable isotope (27Al) that is highly abundant. Additionally, it is the twelfth-most common element in the universe and is used in radiometric dating due to the radioactivity of 26Al.

Gallium: Gallium is a chemical element with symbol Ga and atomic number 31. It was discovered in 1875 by French chemist Paul-Émile Lecoq de Boisbaudran. Gallium belongs to group 13 of the periodic table and shares similarities with other metals in the group.

Indium: Indium is a soft, silvery-white chemical element with atomic number 49. It shares similarities with gallium and thallium and was discovered in 1863 through spectroscopic methods. It is named after the indigo blue line in its spectrum.

Thallium: Thallium (Tl) is a gray post-transition metal with atomic number 81. It is not naturally occurring and resembles tin, but discolors in air. Discovered independently in 1861 by William Crookes and Claude-Auguste Lamy using flame spectroscopy, thallium produces a notable green spectral line. Its name, derived from Greek, means "green shoot" or "twig." Lamy isolated it by electrolysis, while Crookes used precipitation and melting. Crookes showcased the thallium powder, obtained by zinc precipitation, at the international exhibition in 1862.

Carbon: Carbon (C) is a chemical element found in Earth's crust, comprising around 0.025 percent of it. It belongs to group 14 of the periodic table and has atomic number 6. Carbon is nonmetallic and tetravalent, allowing it to form up to four covalent bonds. It occurs naturally in three isotopes, with 12C and 13C being stable and 14C being a radioactive isotope. Carbon, one of the oldest known elements, has been used since antiquity.

Carbon nanotube: Carbon nanotubes (CNTs) are nanometer-sized tubes made entirely of carbon, classified as an allotrope.

Diamond: Diamond is a solid form of carbon with a unique crystal structure. It is incredibly hard and has high thermal conductivity. While graphite is the stable form of carbon, diamond is metastable and converts to graphite at a slow rate. Its hardness and conductivity make it valuable in industrial applications like cutting tools and diamond anvil cells for high-pressure experiments.

Graphite: Graphite is a stable form of carbon, consisting of stacked graphene layers. It occurs naturally and is consumed widely for pencils, lubricants, and electrodes. It is an excellent conductor of heat and electricity, and can convert to diamond under extreme pressures and temperatures.

Silicon: Silicon is a chemical element with symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster. Being a metalloid and semiconductor, it is a member of group 14 in the periodic table. Silicon is relatively unreactive and finds its place in the middle, with carbon above it and germanium, tin, lead, and flerovium below it.

Germanium: Germanium is a chemical element (Ge) with atomic number 32. It is lustrous, hard-brittle, and grayish-white, resembling silicon. As a metalloid in the carbon group, germanium exhibits chemical similarities to silicon and tin. It naturally reacts with oxygen and forms complexes, much like silicon.

Tin: Tin is a soft, silvery metal with symbol Sn and atomic number 50. It can be easily cut and bent by hand. When tin is bent, a distinct "tin cry" sound can be heard due to twinning in its crystal structure. This characteristic is shared by indium, cadmium, zinc, and mercury when they are solid.

Lead: Lead is a chemical element with symbol Pb and atomic number 82. It is a dense, heavy metal that is soft and malleable, with a low melting point. It has a shiny gray appearance that tarnishes to a dull gray when exposed to air. Lead is highly toxic, particularly to children, even in small amounts. It also has the highest atomic number of any stable element and plays a significant role in nuclear decay chains.

Nitrogen: Nitrogen (N) is a nonmetal with atomic number 7 and symbol N. It is the lightest member of group 15, known as the pnictogens. Nitrogen is highly abundant in the universe, ranking seventh in total abundance in the Milky Way and the Solar System. In its diatomic form, as N2, it is a colorless and odorless gas that constitutes approximately 78% of Earth's atmosphere, making it the most abundant uncombined element in the air. However, nitrogen is relatively scarce in solid parts of the Earth due to its volatility.

Phosphorus: Phosphorus (P) is a chemical element with atomic number 15. It exists in two main forms, white phosphorus and red phosphorus. Being highly reactive, it is not found freely in nature. Phosphorus is only present in the Earth's crust in small concentrations, around one gram per kilogram. In minerals, it typically appears as phosphate.

Arsenic: Arsenic is a chemical element (symbol As, atomic number 33) found in minerals, often combined with sulfur and metals. It is a metalloid with multiple allotropes, but the grey metallic form is industrially significant.

Antimony: Antimony is a chemical element (symbol Sb, atomic number 51), occurring as a lustrous gray metalloid. It is primarily found as the sulfide mineral stibnite and has been used in medicine and cosmetics since ancient times. Known by the Arabic name kohl, Antimony has a documented history dating back to 1540 by Vannoccio Biringuccio.

Bismuth: Bismuth is a chemical element with symbol Bi and atomic number 83. It is a post-transition metal, occurring naturally in elemental form. It has similar properties to arsenic and antimony. Its sulfide and oxide forms are commercially valuable. Bismuth has a silvery-white color but can appear iridescent when oxidized. It is an extremely brittle metal and has low thermal conductivity. Bismuth is the most diamagnetic element known.

Oxygen: Oxygen, symbol O, is a chemical element found abundantly in Earth's crust and is the third-most abundant element in the universe. It is a highly reactive nonmetal that readily forms oxides with other elements and compounds. Oxygen exists as diatomic gas, O2, in the Earth's atmosphere, accounting for 20.95% of it. It is a colorless, odorless gas that plays a vital role in supporting life.

Ozone: Ozone is an inorganic molecule (O3) that is a pale blue gas with a pungent smell. It is less stable than oxygen (O2), breaking down into O2 in the lower atmosphere. Ozone forms when oxygen is exposed to UV light and electrical discharges in the Earth's atmosphere. It is found in low concentrations, with the highest concentration in the ozone layer of the stratosphere, which absorbs the majority of the Sun's UV radiation.

Sulfur: Sulfur, symbol S and atomic number 16, is a chemical element. It is abundant, nonmetallic, and forms cyclic octatomic molecules with the formula S8 under normal conditions. Elemental sulfur is a bright yellow solid at room temperature.

Selenium: Selenium, symbol Se and atomic number 34, is a chemical element. It is a nonmetal with properties similar to sulfur, tellurium, and arsenic. Discovered in 1817 by Jöns Jacob Berzelius, Selenium is rarely found in its pure form in Earth's crust.

Tellurium: Tellurium is a rare, brittle, silver-white metalloid with the chemical symbol Te and atomic number 52. It is related to selenium and sulfur and belongs to the chalcogen group. While occasionally found in its elemental crystal form, tellurium is more abundant in the Universe than on Earth. Its scarcity on Earth's crust is comparable to platinum because it formed a volatile hydride that escaped as gas during the planet's formation.

Polonium: Polonium, element 84 on the periodic table, is a rare and highly radioactive metal. It lacks stable isotopes and is chemically similar to selenium and tellurium. It shares metallic properties with thallium, lead, and bismuth. Its natural occurrence is limited to small amounts of polonium-210 in uranium ores. Polonium-209, with a half-life of 124 years, is difficult to produce. It is typically obtained by neutron irradiation of bismuth. Due to its intense radioactivity, its chemistry has been primarily studied on a small scale.

Halogen: Halogens are a group of chemically related elements, including fluorine, chlorine, bromine, iodine, astatine, and tennessine. Astatine and tennessine are radioactive. They are known as group 17 in the periodic table.

Fluorine: Fluorine (F) is a chemical element with atomic number 9. It is the lightest halogen, appearing as a toxic, pale yellow gas at standard conditions. Being the most electronegative element, fluorine is highly reactive and interacts with all elements except the light inert gases.

Chlorine: Chlorine (Cl) is a chemical element with atomic number 17. It is a yellow-green gas at room temperature and appears between fluorine and bromine in the periodic table. Chlorine is highly reactive and serves as a powerful oxidizing agent. It possesses the highest electron affinity and the third-highest electronegativity among the elements, only surpassed by oxygen and fluorine.

Bromine: Bromine is a chemical element with the symbol Br and atomic number 35. It is a red-brown liquid at room temperature that easily evaporates into a vapour of the same color. It possesses properties that are in between chlorine and iodine. The name "bromine" comes from the Ancient Greek word βρῶμος (bromos), meaning "stench," due to its strong and pungent smell. It was discovered independently by chemists Carl Jacob Löwig and Antoine Jérôme Balard.

Iodine: Iodine is a chemical element (symbol I, atomic number 53) and a stable halogen. It is a semi-lustrous, non-metallic solid that turns into a deep violet liquid at 114 °C and a violet gas at 184 °C. It was discovered in 1811 by Bernard Courtois and named by Joseph Louis Gay-Lussac after its violet color.

Astatine: Astatine (At) is a chemical element with atomic number 85. It is the rarest naturally occurring element and is only found as a decay product. All astatine isotopes are short-lived, with a half-life of 8.1 hours for the most stable isotope, astatine-210. Due to its radioactivity, a solid sample of astatine has never been observed as it instantly vaporizes.

Noble gas: The noble gases are elements in group 18 of the periodic table, including helium, neon, argon, krypton, xenon, and radon. They are odorless, colorless gases with low reactivity and extremely low boiling points under standard conditions.

Neon: Neon, symbol Ne, is an inert, colorless gas present in the periodic table as the second noble gas. With an atomic number of 10, it is odorless and monatomic, having approximately two-thirds the density of air under standard conditions.

Argon: Argon is a noble gas and the third most abundant gas in Earth's atmosphere at 0.934%. It is also the most abundant noble gas in the Earth's crust at 0.00015%.

Krypton: Krypton is a chemical element (Kr) with atomic number 36. It is a colorless, odorless, tasteless noble gas found in small quantities in the atmosphere. Krypton is frequently used in fluorescent lamps, along with other rare gases, and it is chemically unreactive.

Xenon: Xenon is a dense, colorless, odorless noble gas with symbol Xe and atomic number 54. It occurs in small quantities in Earth's atmosphere. Although unreactive, it can form xenon hexafluoroplatinate, the first synthesized noble gas compound.

Radon: Radon is an odorless and colorless radioactive noble gas. It has atomic number 86 and symbol Rn. Among the naturally occurring radon isotopes, only radon-222 has a long enough half-life to be released from soil and rock. Radon is constantly generated from the decay of uranium-238 and thorium-232, which have very long half-lives. This element has a short half-life of 3.8 days but will remain on Earth for billions of years. Radon produces other short-lived nuclides, referred to as "radon daughters," which eventually decay into stable isotopes of lead. Radon-222 is part of the uranium series, while radon-220 is part of the thorium series.

Transition metal: Transition metals are elements in the d-block of the periodic table, excluding group 12. Inner transition metals, including lanthanides and actinides, are also sometimes classified as transition metals.

Scandium: Scandium is a silvery-white metallic chemical element with symbol Sc and atomic number 21. It was discovered in 1879 by spectral analysis of minerals from Scandinavia. Although once considered a rare-earth element, it is now classified in the d-block.

Yttrium: Yttrium is a chemical element with symbol Y and atomic number 39. It is a silvery-metallic transition metal, similar to the lanthanides. Usually found in combination with lanthanides in rare-earth minerals, it is never found in nature as a free element. The only stable isotope, 89Y, is the sole isotope found in the Earth's crust.

Lutetium: Lutetium (Lu) is a silvery white metal that resists corrosion in dry air but not in moist air. It is the last element in the lanthanide series, classified as both a rare earth element and the first element of the 6th-period transition metals.

Titanium: Titanium (symbol Ti, atomic number 22) is a chemical element. It is a lustrous transition metal with a silver color, known for its low density and high strength. Resistant to corrosion in sea water, aqua regia, and chlorine, titanium is found in nature only as an oxide.

Zirconium: Zirconium is a chemical element with symbol Zr and atomic number 40. It is a lustrous, grey-white, strong transition metal. Derived from the mineral zircon, it is mainly used as a refractory and opacifier due to its resistance to corrosion. Zirconium forms various inorganic and organometallic compounds. It has five naturally occurring isotopes, four of which are stable. Zirconium compounds have no known biological role.

Hafnium: Hafnium is a chemical element with atomic number 72, symbol Hf, and is found in zirconium minerals. It is a silvery gray metal that resembles zirconium and was predicted by Dmitri Mendeleev in 1869 but discovered in 1922. Hafnium is one of the last two stable elements to be identified and is named after Hafnia, the Latin name for Copenhagen, where it was discovered.

Vanadium: Vanadium, symbol V, is a metallic element with atomic number 23. It is silvery-grey, hard, and malleable. Although rare in nature, it can be isolated artificially. The metal forms an oxide layer that protects it from further oxidation.

Niobium: Niobium is a light grey, crystalline transition metal with symbol Nb and atomic number 41. It is often used in jewelry as a hypoallergenic alternative to nickel due to its slow oxidation. Niobium is found in minerals like pyrochlore and columbite. Its name comes from Greek mythology and it has physical and chemical properties similar to tantalum.

Tantalum: Tantalum is a hard, corrosion-resistant metal with atomic number 73. It is named after Tantalus from Greek mythology and is part of the refractory metals group. It is often found with niobium in minerals like tantalite and coltan. Tantalum is used in high-melting-point alloys due to its strength and ductility.

Chromium: Chromium is a chemical element (Cr) with atomic number 24. It belongs to group 6 and is known for being a hard, brittle, lustrous, and steely-grey transition metal.

Molybdenum: Molybdenum, symbol Mo and atomic number 42, is a chemical element. Its name comes from Ancient Greek Μόλυβδος molybdos, meaning lead, due to its ores resembling lead ores. Discovered in 1778 by Carl Wilhelm Scheele and isolated in 1781 by Peter Jacob Hjelm, molybdenum minerals have a long history.

Tungsten: Tungsten is a rare chemical element (symbol W, atomic number 74), primarily found in compounds with other elements. Discovered in 1781, it became a metal in 1783. Important ores, such as scheelite and wolframite, contribute to its alternative name.

Manganese: Manganese, symbol Mn, is a chemical element with atomic number 25. It is a hard, brittle, and silvery metal found in minerals along with iron. First isolated in the 1770s, manganese serves various industrial alloy uses, especially in stainless steels, enhancing strength, workability, and wear resistance. Moreover, manganese compounds like oxide and sulfate have applications as an oxidizing agent, rubber additive, in glass making, fertilizers, ceramics, and as a fungicide.

Technetium: Technetium is a chemical element with symbol Tc and atomic number 43. It is the lightest radioactive element with all its isotopes being radioactive. It is mostly produced synthetically. It can be found naturally as a result of spontaneous fission in uranium and thorium ores, or as a result of neutron capture in molybdenum ores. It is a silvery gray transition metal located between manganese and rhenium in the periodic table, with properties intermediate to both elements. The most common naturally occurring isotope is 99Tc, but only in small amounts.

Rhenium: Rhenium (Re) is a rare, silvery-gray, heavy element with atomic number 75. It belongs to the transition metals in group 7 of the periodic table. Rhenium has the third-highest melting point and second-highest boiling point among all elements. It is primarily obtained as a by-product during the extraction and refinement of molybdenum and copper ores. With a concentration of only 1 part per billion in the Earth's crust, rhenium is one of the rarest elements. It exhibits a wide range of oxidation states in its compounds, from -1 to +7, and chemically resembles manganese and technetium.

Iron: Iron is a common chemical element (symbol Fe, atomic number 26) and a metal from the first transition series and group 8 on the periodic table. It is the most abundant element on Earth, found in the core and crust, often in its metallic form. Its ores can also be found in meteorites.

Ruthenium: Ruthenium is a rare metal belonging to the platinum group, discovered in 1844 and named after Russia. It is inert to most chemicals and usually found in small amounts in platinum ores. The annual production has increased from 19 to 35.5 tonnes. Ruthenium is used in electrical contacts, resistors, platinum alloys, and as a chemistry catalyst. It is also used as a capping layer for extreme ultraviolet photomasks. Ruthenium is found in the Ural Mountains, North and South America, Sudbury in Ontario, and South Africa.

Osmium: Osmium is a dense, bluish-white transition metal found in alloys, often in platinum ores. It is the densest naturally occurring element, with a density of 22.59 g/cm3. Osmium alloys are used in various applications requiring extreme durability and hardness, such as fountain pen nib tipping and electrical contacts.

Cobalt: Cobalt is a chemical element (Co) found in the Earth's crust in a chemically combined form. It is also present in alloys of natural meteoric iron. When obtained as a free element through reductive smelting, it is a hard, lustrous, and silvery metal.

Rhodium: Rhodium (Rh) is a highly rare and valuable chemical element. It belongs to the platinum group and is a silvery-white, hard, and corrosion-resistant transition metal. Rhodium is a noble metal, with only one naturally occurring isotope (103Rh). It mainly occurs as a free metal or alloy in minerals such as bowieite and rhodplumsite. Rhodium is one of the scarcest and most precious metals.

Iridium: Iridium is a dense, silvery-white transition metal with high corrosion resistance, belonging to the platinum group. It is the second-densest naturally occurring metal and can withstand temperatures up to 2,000°C. Though very resistant to corrosion, finely divided iridium dust can be flammable.

Nickel: Nickel is a silvery-white metal (symbol Ni, atomic number 28). It is hard and ductile, with a slight golden tinge. When exposed to air, it forms a protective layer of nickel oxide, which prevents corrosion. Nickel is rare in the Earth's crust and mostly found in ultramafic rocks and nickel-iron meteorites.

Palladium: Palladium is a rare chemical element with symbol Pd and atomic number 46. It was discovered in 1802 by William Hyde Wollaston and named after the asteroid Pallas. Palladium belongs to the platinum group metals (PGMs) and shares similar chemical properties with platinum, rhodium, ruthenium, iridium, and osmium. It has a lustrous silvery-white appearance and is known for having the lowest melting point and being the least dense among the PGMs.

Platinum: Platinum (Pt) is a dense and malleable chemical element, belonging to the silver-white transition metals. With atomic number 78, it is highly unreactive and precious. The name originated from the Spanish word "platina," meaning silver.

Copper: Copper (Cu) is a soft, malleable metal with high thermal and electrical conductivity. It is used as a conductor of heat and electricity, as a building material, and in various alloys like sterling silver, cupronickel, and constantan. It has a pinkish-orange color and is often utilized in jewelry, marine hardware, coins, and temperature measurement devices.

Silver: Silver is a chemical element with symbol Ag and atomic number 47. It is a soft, white, lustrous metal known for its high electrical and thermal conductivity, as well as reflectivity. Silver is found in its pure form, as well as in alloys with gold and other metals, and in minerals like argentite and chlorargyrite. It is mainly produced as a byproduct in the refining of copper, gold, lead, and zinc.

Gold: Gold is a dense and soft metal with atomic number 79. It is a transition metal, one of the noble metals, and has low reactivity.

Zinc: Zinc is a chemical element with symbol Zn and atomic number 30. It is a slightly brittle metal with a shiny-greyish appearance. Zinc shares chemical similarities with magnesium and has only one normal oxidation state (+2). It is the 24th most abundant element in the Earth's crust and is found in the zinc sulfide mineral sphalerite. Major zinc deposits are located in Australia, Asia, and the United States. The ore is refined through froth flotation, roasting, and electrowinning.

Cadmium: Cadmium is a soft, silvery-white metal with symbol Cd and atomic number 48. It is chemically similar to zinc and mercury, displaying oxidation state +2 in most compounds. Unlike transition metals, cadmium and its group 12 congeners lack partially filled d or f electron shells in their elemental forms. The average concentration of cadmium in Earth's crust ranges between 0.1 and 0.5 ppm. It was discovered in 1817 as an impurity in zinc carbonate by Stromeyer and Hermann in Germany.

Mercury (element): Mercury (Hg) is a heavy silvery d-block element with atomic number 80, symbol Hg. It is commonly known as quicksilver and was formerly called hydrargyrum, derived from Greek words meaning water and silver. Unlike other metallic elements, mercury remains liquid at standard temperature and pressure. The only other element that is liquid under these conditions is the halogen bromine.

Lanthanide: Lanthanides are a group of 14 metallic chemical elements (atomic numbers 57-70) that occupy the 4f orbitals in the periodic table. Although lutetium is a transition metal, it is sometimes included in the lanthanide series.

Lanthanum: Lanthanum (La) is a soft, silvery-white metal that slowly tarnishes when exposed to air. It belongs to the lanthanide series, a group of 15 similar elements, and is the first and prototype of this series. Lanthanum is a rare earth element with atomic number 57 and is commonly found in compounds with an oxidation state of +3. It has no biological role in humans but is essential to certain bacteria and exhibits mild antimicrobial activity.

Cerium: Cerium is a chemical element with symbol Ce and atomic number 58. It is a soft, ductile, silvery-white metal that tarnishes when exposed to air. It belongs to the lanthanide series and exhibits both a characteristic +3 oxidation state and a stable +4 state. While it is one of the rare-earth elements, it has no known biological role in humans and is not highly toxic, except with intense or prolonged exposure.

Praseodymium: Praseodymium is a rare-earth metal with atomic number 59. It is soft, silvery, and possesses magnetic, electrical, chemical, and optical properties. Found in the lanthanide series, it develops a green oxide coating when exposed to air due to its reactivity.

Neodymium: Neodymium (Nd) is a rare-earth metal with atomic number 60. It is a hard, silvery metal that tarnishes quickly in air. Neodymium has complex spectra and produces colorful compounds when oxidized. Discovered in 1885, it is commonly found in minerals like monazite and bastnäsite. Neodymium is refined for general use and is as common as cobalt, nickel, or copper in the Earth's crust. China dominates neodymium mining, similar to other rare-earth metals.

Promethium: Promethium is a rare, radioactive chemical element with symbol Pm and atomic number 61. It is one of only two radioactive elements followed by stable elements on the periodic table (the other being technetium). Promethium is a lanthanide and has only one stable oxidation state of +3. It is extremely scarce, with approximately 500-600 grams occurring naturally in the Earth's crust at any given time.

Samarium: Samarium is a chemical element with symbol Sm and atomic number 62. It is a moderately hard silvery metal that slowly oxidizes in air. It belongs to the lanthanide series and typically has an oxidation state of +3. Besides compounds with an oxidation state of +3, there are also compounds of samarium(II), including SmO, SmS, SmSe, SmTe, and SmI2.

Europium: Europium (Eu) is a silvery-white metal and a chemical element in the lanthanide series. It is highly reactive, soft, and less dense than other lanthanides. It can form a dark oxide coating when exposed to air. Europium was named after Europe and was first isolated in 1901. It usually has an oxidation state of +3, but compounds with +2 are common. While europium has no significant biological role, it is relatively non-toxic. Its main applications involve the phosphorescent properties of its compounds. Europium is one of the rarest elements in the rare-earth group.

Gadolinium: Gadolinium is a silvery-white metal, symbol Gd, with atomic number 64. It is malleable and ductile, reacting slowly with oxygen or moisture to form a black coating. Below 20°C, it is ferromagnetic, with a higher attraction to magnetic fields than nickel. Above this temperature, it is the most paramagnetic element. Gadolinium is found in nature in an oxidized form and often contains impurities of other rare-earths due to their similar chemical properties.

Terbium: Terbium (Tb) is a silvery-white, rare earth metal that belongs to the lanthanide series. Being malleable and ductile, it reacts with water, releasing hydrogen gas. Although never found freely in nature, terbium is present in various minerals like cerite, gadolinite, monazite, xenotime, and euxenite.

Dysprosium: Dysprosium is a rare-earth element with the symbol Dy and atomic number 66. It possesses a metallic silver luster and is commonly found in minerals like xenotime. Unlike other lanthanides, dysprosium does not exist freely in nature. It is composed of seven isotopes, with 164Dy being the most abundant.

Holmium: Holmium (Ho) is a rare-earth element with atomic number 67. It is a soft, silvery metal that is fairly corrosion-resistant and malleable. It forms a yellowish oxide coating when exposed to air but is stable in dry air. Holmium reacts with water, corrodes readily, and burns in air when heated.

Erbium: Erbium (Er) is a silvery-white rare-earth metal with atomic number 68. It is always found combined with other elements and was originally discovered in Ytterby, Sweden.

Thulium: Thulium (Tm) is a chemical element, with atomic number 69. It belongs to the lanthanide series. Thulium commonly exists in the +3 oxidation state, but can also be stable in the +2 oxidation state. Thulium compounds can form coordination complexes with nine water molecules in aqueous solutions.

Ytterbium: Ytterbium (Yb) is a chemical element with atomic number 70, belonging to the lanthanide series. It is a metal and its most common oxidation state is +3. Ytterbium compounds form complexes with nine water molecules in aqueous solution. It has lower density, melting point, and boiling point compared to other lanthanides due to its closed-shell electron configuration.

Actinide: The actinide series consists of 14 metallic elements (atomic numbers 89 to 102), starting with actinium. The chemical symbol An is commonly used to refer to any actinide in discussions on actinide chemistry.

Actinium: Actinium is a chemical element with the symbol Ac and atomic number 89. It was first isolated in 1902 and wrongly identified with a substance called actinium. Actinium gave its name to the actinide series, a group of 15 elements. Alongside polonium, radium, and radon, actinium is one of the first non-primordial radioactive elements to be isolated.

Thorium: Thorium (Th) is a weakly radioactive metal with atomic number 90. It tarnishes to an olive gray color when exposed to air, forming thorium dioxide. It is moderately soft and malleable with a high melting point. Thorium is an electropositive actinide that primarily exists in the +4 oxidation state. It is highly reactive and can combust in air when finely divided.

Protactinium: Protactinium (Pa) is a dense, silvery-gray metal that readily reacts with oxygen, water vapor, and acids. It mainly exists in the +5 oxidation state but can also be found in +4, +3, or +2 states. It is highly radioactive and toxic. Found in very low concentrations in the Earth's crust, it can reach slightly higher levels in some uraninite ore deposits. Due to its scarcity and hazards, protactinium is only used in scientific research, primarily extracted from spent nuclear fuel.

Uranium: Uranium is a chemical element with atomic number 92. It is a silvery-grey metal in the periodic table's actinide series. Uranium undergoes radioactive decay and has a long half-life, making it useful for dating the age of the Earth. The most abundant isotopes are uranium-238 and uranium-235. It is dense and occurs naturally in low concentrations in soil, rock, and water, being extracted from minerals like uraninite for commercial use.

Neptunium: Neptunium (Np) is a radioactive actinide metal with atomic number 93. It is the first transuranic element and named after Neptune due to its position in the periodic table. Neptunium metal tarnishes and occurs in three allotropic forms. It exhibits oxidation states from +3 to +7. Being radioactive and poisonous, neptunium is dangerous to handle as it can accumulate in bones.

Plutonium: Plutonium (Pu) is a radioactive chemical element with atomic number 94. It is a silvery-gray metal that tarnishes and forms a dull coating when exposed to air. Plutonium has six allotropes, four oxidation states, and reacts with various elements. When in contact with moist air, it forms oxides and hydrides, resulting in a volume expansion of up to 70% and the release of a pyrophoric powder. Due to its accumulation in bones, plutonium is highly dangerous to handle.

Americium: Americium is a synthetic radioactive element with symbol Am and atomic number 95. It is a transuranic member of the actinide series, found below europium on the periodic table. Named after the Americas, it possesses these distinguishing characteristics.

Curium: Curium (Cm) is a synthetic chemical element with atomic number 96. It is a transuranic actinide named after Marie and Pierre Curie, renowned for their research on radioactivity. In 1944, curium was intentionally created by bombarding plutonium with alpha particles. Its discovery was kept secret until after World War II and was announced to the public in 1947. Curium is primarily produced in nuclear reactors by bombarding uranium or plutonium with neutrons. A tonne of spent nuclear fuel contains around 20 grams of curium.

Berkelium: Berkelium (Bk) is a synthetic element with atomic number 97. It belongs to the actinide and transuranium series. Discovered in December 1949 at the Lawrence Berkeley National Laboratory in Berkeley, California, it is named after the city. Berkelium was the fifth transuranium element found, following neptunium, plutonium, curium, and americium.

Californium: Californium (Cf) is a synthetic chemical element with atomic number 98. It was first created in 1950 by bombarding curium with alpha particles at Lawrence Berkeley National Laboratory. Californium is an actinide element, the sixth transuranium element synthesized, and has a high atomic mass. It is named after the state of California and was one of the few elements produced in quantities visible to the naked eye.

Synthetic element: A synthetic element is a man-made chemical element not naturally found on Earth. These elements, with atomic numbers 95-118, were created by manipulating particles in nuclear reactors, particle accelerators, or atomic bomb explosions. Synthetic elements are unstable and decay at different rates, with half-lives ranging from microseconds to millions of years.

Acid: An acid is a molecule or ion that can donate a hydrogen ion (H+) or form a covalent bond with an electron pair. It acts as a Brønsted–Lowry acid or a Lewis acid, respectively.

Base (chemistry): "Base (chemistry)" refers to substances that react with acids and has three common definitions: Arrhenius bases, Brønsted bases, and Lewis bases. This term was first proposed by G.-F. Rouelle in the mid-18th century.

pH: pH is a measure of acidity or basicity in chemistry, symbolized with "potential of hydrogen". It defines the acidity or basicity of water-based solutions, with lower pH values indicating acidity and higher values indicating alkalinity.

Boric acid: Boric acid, also known as orthoboric acid, is a compound containing boron, oxygen, and hydrogen. It is a weak acid that can dissolve in water and is found in nature as the mineral sassolite. It appears as colorless crystals or a white powder. Boric acid can form different borate anions and salts, and can react with alcohols to create borate esters.

Hydrochloric acid: Hydrochloric acid, also called muriatic acid, is a strong, colorless solution of hydrogen chloride (HCl). It has a pungent smell and is commonly found in the digestive system of animals, including humans. Apart from being a laboratory reagent and industrial chemical, it plays a vital role as a component of gastric acid.

Hydrofluoric acid: Hydrofluoric acid (HF) is a colorless and highly corrosive solution of hydrogen fluoride in water. It is utilized in the production of fluorine-containing compounds, including popular medications like fluoxetine (Prozac) and materials like Teflon. It is also used for glass and silicon wafer etching and serves as a source for elemental fluorine.

Nitric acid: Nitric acid (HNO3) is a highly corrosive mineral compound that is colorless in its pure form. It can turn yellow over time due to decomposition into nitrogen oxides. Commercially available nitric acid is usually 68% concentration in water. When the concentration exceeds 86%, it is called fuming nitric acid, further classified as red fuming nitric acid (above 86%) or white fuming nitric acid (above 95%) based on nitrogen dioxide content.

Phosphoric acid: Phosphoric acid (H3PO4) is an odorless and colorless inorganic compound, commonly found in an 85% aqueous solution. It is widely used in industrial applications and is a crucial ingredient in various fertilizers.

Sulfuric acid: Sulfuric acid, also known as oil of vitriol, is a mineral acid made up of sulfur, oxygen, and hydrogen (H2SO4). It is a colorless, odorless, and thick liquid that can mix with water.

Carboxylic acid: A carboxylic acid is an organic acid that contains a carboxyl group attached to an R-group. Its general formula is written as R-COOH or R-CO2H, with R representing different groups. Carboxylic acids are widely found in nature, including amino acids and fatty acids. When a carboxylic acid loses a proton, it forms a carboxylate anion.

Acetic acid: Acetic acid, also known as ethanoic acid, is a colorless liquid that is the main component of vinegar. It has a chemical formula of CH3COOH and has been used in vinegar for centuries. Vinegar contains at least 4% acetic acid besides water.

Citric acid: Citric acid is a weak organic acid found in citrus fruits, playing a central role in the metabolism of aerobic organisms as an intermediate in the citric acid cycle.

Lactic acid: Lactic acid is an organic acid with the molecular formula CH3CH(OH)COOH. It is miscible with water and exists as a white solid or colorless solution. It can be produced synthetically or found naturally. Lactic acid is an alpha-hydroxy acid and is widely used in organic synthesis and biochemical industries. Its conjugate base is called lactate, and the derived acyl group is lactoyl.

Alloy: An alloy is a mixture of chemical elements, with at least one being a metal. It retains the properties of a metal, such as electrical conductivity and luster, but can also have different properties like increased strength. Alloys can reduce material costs while maintaining important characteristics, and they can also enhance properties like corrosion resistance or mechanical strength.

Amalgam (chemistry): Amalgam is a metal alloy containing mercury that can be a liquid, paste, or solid. It is formed through metallic bonding, binding metal ions together. Most metals can form amalgams except for iron, platinum, tungsten, and tantalum. Silver-mercury amalgams are used in dentistry, while gold-mercury amalgam is used to extract gold from ore. Dentistry also uses mercury alloys with metals like silver, copper, indium, tin, and zinc.

Brass: Brass is a versatile alloy of copper and zinc, with diverse properties and color variations. With copper typically having a higher proportion, it has been used since ancient times. It is a substitutional alloy allowing atoms of copper and zinc to replace each other within the same crystal structure.

Bronze: Bronze is a copper-based alloy commonly made with around 12-12.5% tin and other metals. It can also contain non-metals like phosphorus or metalloids such as arsenic or silicon. These additions create a variety of alloys with helpful properties like hardness, strength, ductility, and machinability.

Cast iron: Cast iron is a type of iron made with more than 2% carbon and around 1-3% silicon. It has a low melting temperature, making it useful for various applications. Different types of cast iron have different formations of carbon. White cast iron has hard and brittle carbon called cementite, while grey cast iron has graphite flakes that deflect cracks and initiate new ones. Ductile cast iron has spherical graphite nodules that prevent cracks from spreading.

Steel: Steel is a strong and resilient alloy made of iron and carbon. It possesses enhanced strength and fracture resistance compared to other forms of iron. Steel can be further improved by adding various elements. Stainless steel, for example, requires 11% chromium to resist corrosion and oxidation. Due to its low cost and high tensile strength, steel finds utility in buildings, infrastructure, tools, transportation, machinery, appliances, furniture, and weaponry.

Stainless steel: Stainless steel, also called inox, is a corrosion-resistant alloy of iron. It contains chromium (at least 10.5%) and often nickel, with carbon ranging from 0.2 to 2.11%. The chromium forms a protective film that defends against corrosion and allows self-healing in the presence of oxygen.

Wrought iron: Wrought iron is a low carbon iron alloy, distinguished from cast iron. It has a fibrous slag structure that resembles wood grain when etched, rusted, or bent. Wrought iron is tough, malleable, ductile, and corrosion resistant. It can be easily forge welded but is less suitable for electrical welding.

Syngas: Syngas is a mixture of hydrogen and carbon monoxide, often with some carbon dioxide and methane. It is used primarily for producing ammonia or methanol. Syngas is combustible and can be used as a fuel. It has been historically used as a gasoline replacement, such as wood gas during WWII to power cars in Europe.

Carbon monoxide: Carbon monoxide is a toxic, flammable gas that is invisible and odorless. It is formed by a bond between a carbon and an oxygen atom. Commonly known as CO, it is found in industrial processes and its presence can be harmful.

Carbon dioxide: Carbon dioxide (CO2) is a chemical compound that consists of one carbon atom bonded to two oxygen atoms. It is a gas at room temperature and serves as the primary carbon source for life on Earth through the carbon cycle. Carbon dioxide is transparent to visible light but absorbs infrared radiation, making it a greenhouse gas. It is soluble in water and found in various sources such as groundwater, lakes, ice caps, and seawater. When dissolved in water, it forms carbonate and bicarbonate, contributing to ocean acidification.

Nitrous oxide: Nitrous oxide, or laughing gas, is a colourless non-flammable gas with a slightly sweet smell. It is an oxide of nitrogen and acts as a strong oxidizer at high temperatures, resembling molecular oxygen.

Ammonia: Ammonia (NH3) is a colourless gas with a strong smell. It serves as a nitrogenous waste and is used in fertilisers. 70% of industrially produced ammonia is used for fertiliser production, including urea and diammonium phosphate. Additionally, pure ammonia is directly applied to soil.

Hydrogen peroxide: Hydrogen peroxide (H2O2) is a pale blue liquid used as an oxidizer, bleaching agent, and antiseptic. It is slightly more viscous than water and commonly found in diluted form for consumer use. In higher concentrations, it is used for industrial purposes. Concentrated hydrogen peroxide, known as "high-test peroxide", can explode when heated and has been utilized in rocketry as both a monopropellant and an oxidizer.

Water: Water (H2O) is an essential and abundant inorganic compound found on Earth. It is a colorless, tasteless, and odorless substance that makes up a significant part of our planet's hydrosphere and all living organisms. With a unique chemical structure, each water molecule contains one oxygen atom bonded to two hydrogen atoms. Despite not providing food energy or organic nutrients, water is vital for all forms of life. At standard conditions, "water" refers to its liquid state.

Properties of water: Water is a polar compound that is tasteless, odorless, and nearly colorless. It is known as the "universal solvent" and "solvent of life" due to its ability to dissolve many substances. Water is the most abundant substance on Earth's surface and can exist as a solid, liquid, and gas. It is also the third most abundant molecule in the universe.

Ice: Ice is solid water formed at or below freezing temperatures. It has an ordered structure and is considered a mineral. It can be transparent or bluish-white depending on impurities.

Water vapor: Water vapor is the gaseous phase of water found in the hydrosphere. It can be produced through evaporation, boiling, or ice sublimation. Being transparent, it contributes to the atmosphere and is continuously generated by evaporation and removed by condensation. Water vapor's low density triggers convection currents, which can result in the formation of clouds and fog.

Organophosphorus chemistry: Organophosphorus chemistry is the study of phosphorus-containing organic compounds. These compounds are used in pest control as alternatives to environmentally persistent chlorinated hydrocarbons. Some organophosphorus compounds are powerful insecticides but others, such as sarin and VX nerve agents, are highly toxic to humans.

Organosilicon chemistry: Organosilicon chemistry involves the study of compounds that have carbon-silicon bonds. These compounds, known as organosilicon compounds, are similar to organic compounds in many ways. They are colorless, flammable, hydrophobic, and stable to air. However, silicon carbide is an exception to this as it is an inorganic compound.

Silicone: Silicone is a versatile polymer made of siloxane units. It can exist as colorless oils or rubber-like materials. Silicone finds wide applications in sealants, adhesives, lubricants, medicine, cooking utensils, thermal insulation, and electrical insulation. Various forms of silicone include oil, grease, rubber, resin, and caulk.

Organosulfur chemistry: Organosulfur chemistry is the study of sulfur-containing organic compounds. These compounds can have foul odors or be sweet, like saccharin. Sulfur is vital for life and is found in important substances such as antibiotics and amino acids. Fossil fuels also contain organosulfur compounds, which oil refineries work to remove.

Thiol: A thiol is an organosulfur compound with the formula R−SH. It contains the −SH functional group called thiol or sulfhydryl or sulfanyl group. Thiols are sulfur versions of alcohols, combining "thio-" and "alcohol."

Hydrocarbon: Hydrocarbons are organic compounds made up of hydrogen and carbon. They are colorless, hydrophobic, and can have a faint odor similar to gasoline or lighter fluid. Hydrocarbons can exist as gases, liquids, low melting solids, or polymers, with a wide variety of molecular structures.

Petroleum: Petroleum, also called crude oil or simply oil, is a natural liquid composed mostly of hydrocarbons. It is found in geological formations and includes both unprocessed crude oil and refined petroleum products.

Alkane: An alkane, also known as a paraffin, is a type of organic compound made up of hydrogen and carbon atoms arranged in a tree-like structure. All carbon-carbon bonds in alkane molecules are single. Alkanes have the formula CnH2n+2, where n represents the number of carbon atoms. They can range from simple, like methane, to highly complex molecules such as pentacontane or 6-ethyl-2-methyl-5-(1-methylethyl) octane.

Methane: Methane (CH4) is the simplest alkane and a major component of natural gas. Its abundance on Earth makes it a valuable fuel, but capturing and storing it is challenging due to its gaseous state under normal conditions.

Ethane: Ethane is a natural and odorless gas with the chemical formula C2H6. It is obtained from natural gas and petroleum refining. Ethane is primarily used as a raw material for producing ethylene.

Propane: Propane is a three-carbon alkane gas commonly used as a fuel in domestic and industrial applications. It is compressible to a transportable liquid and burns more cleanly than gasoline and coal. Discovered in 1857, it became commercially available in the US by 1911. Propane is part of a group of liquefied petroleum gases and is a by-product of natural gas processing and petroleum refining.

Butane: Butane is a flammable, colorless gas with the formula C4H10 that easily evaporates at room temperature. The name originates from butyric acid, meaning butter in Greek. It was first discovered in crude petroleum in 1864 and commercially used in the early 1910s by Walter O. Snelling.

Alkene: An alkene, or olefin, is an organic compound containing a carbon–carbon double bond, which can be either internal or at the terminal position. Terminal alkenes are also referred to as α-olefins.

Ethylene: Ethylene, C2H4, is a colorless, flammable gas with a faint "sweet and musky" odor. It is the simplest alkene and serves as an important hydrocarbon in various industries.

Propylene: Propylene, or propene, is an unsaturated organic compound (CH3CH=CH2) belonging to the alkene class of hydrocarbons. It has one double bond, appears as a colorless gas, and has a subtle petroleum-like smell.

Alkyne: An alkyne is a type of unsaturated hydrocarbon with at least one carbon-carbon triple bond. It belongs to a homologous series with the formula CnH2n−2. Alkynes are also called acetylenes, with C2H2 known as ethyne. They are generally hydrophobic, like other hydrocarbons.

Aromatic compound: Aromatic compounds, also known as arenes, are organic compounds with a unique chemistry characterized by cyclic conjugation, notably exemplified by benzene. The term "aromatic" originated from odor-based categorization, but it now refers to compounds that satisfy Hückel's Rule and have specific properties. These compounds are typically unreactive, nonpolar, and hydrophobic, with a high carbon-hydrogen ratio. They burn with a distinctive yellow flame and undergo electrophilic and nucleophilic substitutions.

Benzene: Benzene is an organic chemical compound (C6H6) composed of a hexagonal ring with six carbon atoms and a hydrogen atom attached to each. It is classified as a hydrocarbon due to the presence of only carbon and hydrogen atoms.

Alcohol (chemistry): An alcohol is an organic compound with a hydroxyl group attached to a saturated carbon atom. Alcohols can be simple, like methanol and ethanol, or complex, like sucrose and cholesterol. The hydroxyl group gives alcohols hydrophilic properties and provides a site for various reactions.

Methanol: Methanol is a basic alcohol compound (CH3OH) that is colorless, flammable, and has a distinctive odor. It was commonly known as wood alcohol due to its historical production method from wood distillation. However, it is now predominantly produced by hydrogenation of carbon monoxide in industrial settings.

Ethanol: Ethanol, also known as ethyl alcohol, is a volatile and flammable organic compound with the formula CH3CH2OH. It has a characteristic wine-like smell and pungent taste. Ethanol works as a psychoactive recreational drug and is found as the main component in alcoholic beverages.

Phenol: Phenol, or Benzenol, is an aromatic organic compound (C6H5OH) that is a white volatile solid. It contains a phenyl group bonded to a hydroxy group and is mildly acidic. Careful handling is necessary due to its potential to cause chemical burns.

Aldehyde: An aldehyde is an organic compound with the R-CH=O functional group, also known as a formyl group. Aldehydes are widely found in technology and biology due to their presence in many important chemicals.

Formaldehyde: Formaldehyde is a pungent, colorless gas with the formula CH2O. It spontaneously forms paraformaldehyde and is stored as formalin. It is the simplest aldehyde and widely used in industry for manufacturing resins and coatings. Its global production rate in 2006 was 12 million tons per year. Small amounts of formaldehyde can also be found naturally.

Ketone: A ketone is an organic compound with a carbonyl group (−C=O) and can have various carbon-containing substituents. Acetone is the simplest ketone and has the formula (CH3)2CO. Ketones are significant in biology and industry, including in sugars, steroids, and the solvent acetone.

Acetone: Acetone (CH3)2CO is the smallest ketone, a colorless and flammable liquid with a pungent odor. It is highly volatile and an organic compound.

Amide: An amide, or organic amide, is a compound with the formula R−C(=O)−NR′R″, where R, R', and R″ represent various groups or hydrogen atoms. In proteins, the amide group is known as a peptide bond in the main chain or an isopeptide bond in the side chain. It is a derivative of a carboxylic acid with the hydroxyl group replaced by an amine group.

Urea: Urea, or carbamide, is an organic compound (CO(NH2)2) with two amino groups linked by a carbonyl group. It is the simplest amide of carbamic acid.

Nylon: Nylon is a synthetic polymer composed of amide backbones that link aliphatic or semi-aromatic groups.

Amine: Amines are compounds with a basic nitrogen atom and a lone pair. They are derivatives of ammonia, with hydrogen atoms replaced by substituents like alkyl or aryl groups. Key examples include amino acids, biogenic amines, trimethylamine, and aniline. Inorganic derivatives like monochloramine are also called amines.

Ester: An ester is a compound formed from an acid where the hydrogen atom in the acidic hydroxyl group is replaced by an organyl group. Ester category also includes compounds where oxygen is replaced by other chalcogens. Some authors consider derivatives of other acids as esters, but not according to IUPAC.

Ether: Ether is a type of compound in organic chemistry characterized by an oxygen atom bonded to two alkyl or aryl groups. It can be divided into simple (symmetrical) ethers with identical groups on either side of the oxygen atom, and mixed (unsymmetrical) ethers with different groups. Diethyl ether is an example of a simple ether widely used as a solvent and anesthetic. Ethers are important in both organic and biochemistry, often found in carbohydrates and lignin.

Haloalkane: Haloalkanes, also known as alkyl halides, are a type of compound that contain halogen substituents. They are commonly used for various purposes such as flame retardants, solvents, and pharmaceuticals, but they can also be harmful pollutants. Chlorine, bromine, and iodine-containing haloalkanes pose a threat to the ozone layer, while fluorinated haloalkanes may act as greenhouse gases. Methyl iodide, however, does not deplete the ozone layer. These compounds have the general formula "RX," where R is an alkyl or substituted alkyl group and X is a halogen.

Polymer: A polymer is a substance with large molecules called macromolecules, made up of many repeating subunits. Both natural and synthetic polymers have diverse properties that are essential in everyday life. They range from plastics like polystyrene to biopolymers like DNA and proteins. Polymers are produced by combining small molecules called monomers through a process called polymerization. Their large molecular mass gives them unique physical properties such as toughness, elasticity, and the ability to form amorphous or semicrystalline structures.

Polyethylene: Polyethylene (PE) is a widely used polymer and the most common plastic. It is mainly employed for packaging purposes like bags, films, and containers. With an annual production of over 100 million tonnes, it constitutes 34% of the total plastics market as of 2017.

Polypropylene: Polypropylene (PP), or polypropene, is a versatile thermoplastic polymer produced from propylene monomers through chain-growth polymerization. It finds widespread applications in various industries.

Polyvinyl chloride: Polyvinyl chloride (PVC) is a commonly used synthetic polymer that ranks as the third most widely produced plastic. It is produced in massive quantities, with around 40 million tons manufactured annually.

Tannin: Tannins are bitter, astringent substances that are found in various plants. They have the unique ability to bind and cause proteins, amino acids, and alkaloids to separate and form sediments.

Salt (chemistry): A salt in chemistry is a compound made of ions with opposite charges that balance each other, resulting in no net electric charge. For example, table salt consists of sodium ions carrying positive charges and chloride ions carrying negative charges.

Cyanide: Cyanide is a chemical compound with a C≡N functional group, consisting of a carbon atom triple-bonded to a nitrogen atom.

Chloride: Chloride refers to a negatively charged chlorine ion or a non-charged chlorine atom bonded to other molecules. It includes inorganic salts and organic compounds. The term 'chloride' is pronounced differently.

Calcium chloride: Calcium chloride (CaCl2) is an inorganic salt that is white and crystalline. It readily dissolves in water and is formed by reacting hydrochloric acid with calcium hydroxide.

Sodium chloride: Sodium chloride, also known as table salt, is an ionic compound (NaCl) consisting of sodium and chloride ions. It is responsible for seawater's salinity and the extracellular fluid in organisms. Besides being a condiment and food preservative, it is widely used in industries and serves as a source for sodium and chlorine compounds used in chemical syntheses. Sodium chloride is also applied for deicing roadways in sub-freezing weather.

Oxide: An oxide is a compound with at least one oxygen atom and another element in its formula. It is the dianion of oxygen, with oxygen in the oxidation state of −2. Oxides make up a significant part of the Earth's crust and even pure elements can develop oxide coatings, like aluminium foil with a protective Al2O3 layer.

Titanium dioxide: Titanium dioxide, also known as titanium(IV) oxide or titania, is an inorganic compound with the chemical formula TiO2. It is a white solid widely used as a pigment called titanium white in applications such as paint, sunscreen, and food coloring. It is insoluble in water but can appear black in mineral forms. With global production exceeding 9 million tonnes in 2014, titanium dioxide is estimated to be used in two-thirds of all pigments and valued at $13.2 billion. It is assigned E number E171 when used as a food coloring.

Silicate: Silicates are polyatomic anions consisting of silicon and oxygen with various formulas such as SiO4−4, SiO2−3, and Si2O6−7. They can form salts like sodium metasilicate and esters like tetramethyl orthosilicate. Silicates are also used to refer to anions containing silicon, sometimes with other atoms like fluorine. Silicates are commonly found as silicate minerals.

Sodium silicate: Sodium silicate is a group of chemical compounds with the formula Na2xSiyO2y+x, such as sodium metasilicate and sodium orthosilicate. These compounds are usually colorless solids or white powders that dissolve in water. Sodium silicate is widely used in various applications.

Sodium bicarbonate: Sodium bicarbonate, also known as baking soda or bicarbonate of soda, is a white solid commonly used in baking. It is composed of sodium and bicarbonate ions and has a slightly salty, alkaline taste. Sodium bicarbonate is often in a fine powder form and is found in mineral springs.

Carbonate: Carbonate is a salt of carbonic acid (H2CO3). It contains the carbonate ion (CO2−3). The term also refers to an organic compound with the carbonate group O=C(−O−)2.

Calcium carbonate: Calcium carbonate (CaCO3) is a common compound found in rocks like calcite and aragonite, as well as in chalk, limestone, shells, and pearls. It is considered calcareous. This substance is used as an active ingredient in agricultural lime and can be formed as limescale by the reaction of calcium ions and carbonate ions in hard water. Calcium carbonate has medical applications as a calcium supplement and antacid. However, excessive consumption can lead to health problems such as hypercalcemia and digestive issues.

Sodium carbonate: Sodium carbonate (Na2CO3) is an inorganic compound and its hydrates are white, odourless, water-soluble salts. It is known as "soda ash" and was historically extracted from sodium-rich plant ashes. Today, it is produced in large quantities through the Solvay process from sodium chloride and limestone, or by carbonating sodium hydroxide made using the Chlor-alkali process.

Potassium hydroxide: Potassium hydroxide (KOH) is an inorganic compound, commonly known as caustic potash. It has the chemical formula KOH and is highly corrosive.

Sodium hydroxide: Sodium hydroxide, or lye/caustic soda, is a white solid compound (NaOH) consisting of sodium cations (Na+) and hydroxide anions (OH−).

Nitrate: Nitrate (NO−3) is a polyatomic ion found in salts known as nitrates. It is commonly used in fertilizers and explosives. Most inorganic nitrates easily dissolve in water, but bismuth oxynitrate is an exception as it is insoluble.

Ammonium nitrate: Ammonium nitrate (NH4NO3) is a white crystalline salt used mainly as a water-soluble and hygroscopic fertilizer in agriculture. The compound consists of ammonium and nitrate ions, and it does not form hydrates.

Potassium nitrate: Potassium nitrate is a compound with the formula KNO3, and it has a sharp, salty, bitter taste. It is an ionic salt consisting of potassium ions (K+) and nitrate ions (NO3−). Found naturally as a mineral called niter, it is an alkali metal nitrate. It is used as a source of nitrogen and is a component of saltpeter, a group of nitrogen-containing compounds. Nitrogen was named after niter.

Sodium nitrate: Sodium nitrate (NaNO3) is a nitrate salt commonly referred to as Chile saltpeter. It is distinct from potassium nitrate and is also known as nitratine or soda niter in its mineral form.

Sulfate: Sulfate (SO2−4) is a common polyatomic anion found in salts, acid derivatives, and peroxides used across various industries. It is also present in everyday life. Sulfates are formed from sulfuric acid and are commonly used in their salt form.

Alum: Alum is a chemical compound consisting of hydrated double sulfate salts of aluminum. The general formula is XAl(SO4)2·12H2O, with X being a monovalent cation like potassium or ammonium. The term "alum" commonly refers to potassium alum, KAl(SO4)2·12H2O. Different alums take their names from the monovalent ion they contain, like sodium alum and ammonium alum.

Ammonium sulfate: Ammonium sulfate, also known as ammonium sulphate, is an inorganic salt used mainly as a soil fertilizer. It consists of 21% nitrogen and 24% sulfur, making it beneficial for plant growth.

Magnesium sulfate: Magnesium sulfate (MgSO4) is a white crystalline salt compound, soluble in water but not in ethanol. It contains magnesium cations (Mg2+) and sulfate anions (SO2−4), making up about 20.19% of its mass.

Sodium sulfate: Sodium sulfate, also called sodium sulphate, is an inorganic compound (Na2SO4) found in different hydrated forms. It is a white solid that easily dissolves in water. The decahydrate is widely produced and used as a filler in laundry detergents and in paper pulping processes, where it helps create alkaline sulfides.

Mass spectrometry: Mass spectrometry (MS) is an analytical technique measuring ion mass-to-charge ratio. It generates a mass spectrum plot showing intensity versus mass-to-charge ratio. Widely used, MS serves various fields and analyzes both pure samples and complex mixtures.

Spectroscopy: Spectroscopy is the study of electromagnetic spectra, specifically measuring and interpreting them. It encompasses the analysis of color across the entire electromagnetic spectrum, going beyond visible light.

Absorption spectroscopy: Absorption spectroscopy measures how electromagnetic radiation is absorbed by a sample, creating an absorption spectrum that shows how intensity changes with frequency or wavelength. This technique is used across the electromagnetic spectrum to understand the interaction between radiation and samples.

Radical (chemistry): A radical, or free radical, in chemistry refers to an entity with at least one unpaired valence electron. These unpaired electrons make radicals highly reactive, and they often combine with other radicals. Most organic radicals have short lifetimes.

Reaction mechanism: A reaction mechanism is the sequence of elementary reactions that lead to an overall chemical reaction. It provides a step-by-step understanding of how the reaction occurs.

Substitution reaction: A substitution reaction is an important type of chemical reaction in organic chemistry where one functional group is replaced by another. Substitution reactions can be electrophilic or nucleophilic based on the reagent and the reactive intermediate involved. Understanding these reactions helps predict products and optimize conditions for the reaction.

Redox: Redox refers to a chemical reaction where the oxidation states of a substance change. Oxidation involves losing electrons or increasing the oxidation state, while reduction involves gaining electrons or decreasing the oxidation state.

Corrosion: Corrosion is the natural deterioration of metals through chemical reactions, converting them into stable oxides. It occurs gradually due to interactions with the environment. Corrosion engineering aims to control and prevent this process.

Acid–base reaction: An acid-base reaction is a chemical reaction between an acid and a base. It can be used to determine pH through titration. Various acid-base theories, such as Brønsted-Lowry theory, offer alternative perspectives on the reaction mechanisms.

Electrolysis: Electrolysis is a process that utilizes electric current to facilitate non-spontaneous chemical reactions in manufacturing and chemistry. It plays a vital role in separating elements from natural sources like ores with the help of an electrolytic cell. The required voltage for electrolysis, known as decomposition potential, initiates the breakdown of substances through electricity. Overall, electrolysis can be defined as the electrically induced breakdown or separation of compounds.

Combustion: Combustion is a chemical reaction between a fuel and oxygen that produces gaseous products, often seen as smoke. It may or may not result in a visible flame, which indicates the reaction. Activation energy is needed to start combustion, but a flame can sustain the reaction with its heat.

Haber process: The Haber process, also known as the Haber-Bosch process, is a significant industrial method for producing ammonia. Developed by German chemists Fritz Haber and Carl Bosch in the early 1900s, this process converts atmospheric nitrogen to ammonia through a reaction with hydrogen using an iron catalyst under high temperatures and pressures. The reaction is slightly exothermic, favoring lower temperatures and higher pressures. Hydrogen is generated via steam reforming, and an iterative closed cycle is used to react hydrogen with nitrogen to create ammonia.

Chromatography: Chromatography is a lab technique used to separate mixtures into individual components. A fluid solvent known as the mobile phase carries the mixture through a system containing a fixed material called the stationary phase. The components of the mixture interact differently with the stationary phase, causing them to separate based on their affinities. The separation relies on the differential partitioning between the mobile and stationary phases, with compounds having different retention times.

Distillation: Distillation is a process that separates substances from a liquid mixture by boiling and condensing. It can either completely separate components or increase the concentration of selected ones. This physical separation method is widely used in various industries, such as in the production of distilled beverages, desalination, oil stabilization, and chemical synthesis. Distillation is also utilized to separate air into its components for industrial purposes.

Filtration: Filtration is a physical separation process using a complex filter to separate solid matter from fluid in a mixture. The fluid passes through, called the filtrate, while solid particles are described as oversize. There may be blinding or the formation of a filter cake. The filter's effective pore size determines the largest particles it can pass. Filtration is imperfect, contaminating solids with fluid and producing fine particles in the filtrate. It occurs in nature and engineered systems, including biological, geological, and industrial forms.

Valence bond theory: Valence bond theory is a chemical bonding theory that uses quantum mechanics to explain how atomic orbitals of dissociated atoms combine to form individual chemical bonds in a molecule. This theory contrasts with molecular orbital theory, which considers orbitals that span the entire molecule.

Chemical kinetics: Chemical kinetics, or reaction kinetics, is a branch of physical chemistry that studies the speed of chemical reactions. It explores the influence of experimental conditions on reaction rates and provides insights into reaction mechanisms and transition states. It differs from chemical thermodynamics, which focuses on reaction direction rather than rate. Chemical kinetics also involves developing mathematical models to describe the characteristics of reactions.

Intermolecular force: Intermolecular forces are the forces that allow molecules to interact with each other, including electromagnetic forces of attraction or repulsion. These forces are weaker than the forces that hold molecules together, such as covalent bonds. Intermolecular forces play a vital role in molecular mechanics models.

Earth science: Earth science, also known as geoscience, studies the Earth's complex constitution of its four spheres: biosphere, hydrosphere/cryosphere, atmosphere, and geosphere. It includes the physical, chemical, and biological aspects of the planet. Earth science is a branch of planetary science with a long history.

History of Earth: The Earth's history spans from formation to present day, with constant geological changes and biological evolution. Contributions from various branches of natural science have helped to understand significant events.

Extinction event: An extinction event refers to a widespread and rapid decline in Earth's biodiversity, characterized by a sharp decrease in the abundance and variety of multicellular organisms. It happens when the rate of extinction surpasses the background extinction rate and the rate of new species formation. There are varying estimates, ranging from as few as five to more than twenty, regarding the number of major mass extinctions in the past 540 million years. Disagreements arise from different interpretations of what defines a "major" extinction event and the selected data used to assess historical biodiversity.

Ice age: An ice age is a prolonged period of cold temperatures on Earth's surface and atmosphere, leading to the growth of ice sheets and glaciers. These ice ages alternate with warmer periods, known as interglacials, when glaciers recede. The current ice age is called Quaternary glaciation. This cycle includes glacial periods, characterized by colder climates, and interglacials, marked by intermittent warmer climates.

Natural disaster: A natural disaster is a highly harmful event caused by natural hazards such as floods, earthquakes, cyclones, and wildfires. It can cause loss of life, property damage, and economic devastation. Scholars suggest using the term "disaster" instead, while also specifying the type of hazard. A disaster occurs when a vulnerable community is affected by a natural or human-made hazard, resulting in significant damage and impact.

Wildfire: A wildfire is an unplanned and uncontrolled fire in an area with combustible vegetation. It can be called forest fire, bushfire, or wildland fire depending on the type of vegetation. Some ecosystems actually depend on wildfires. However, there is a distinction between wildfires and controlled burns carried out by humans. Controlled burns can sometimes turn into wildfires. Prescribed burns are often used in modern forest management to reduce risks and support natural forest cycles.

Natural resource: Natural resources are resources taken from nature that are used with minimal alterations. They include sunlight, atmosphere, water, land, minerals, vegetation, and wildlife. These resources possess various valued qualities, including commercial and industrial use, aesthetic value, scientific interest, and cultural significance.

Desert: A desert is a barren area with minimal precipitation, making it difficult for plant and animal life to survive. This exposes the ground to erosion. Approximately one-third of Earth's land surface is arid or semi-arid, including polar regions. Deserts can be classified based on precipitation, temperature, causes of desertification, or geographical location.

Oasis: An oasis is a fertile area in a desert or semi-desert where plants thrive and animals find shelter. It can have surface water or rely on wells and underground channels created by humans. Oases may also serve as historical rest stops on routes, offering access to underground water through wells.

Drought: A drought is an extended period of drier-than-normal conditions that can last for days, months, or years. It has significant impacts on ecosystems, agriculture, and the local economy. Dry seasons in the tropics increase the chances of drought and wildfires. Heat worsens drought conditions by accelerating evaporation, drying out vegetation, and increasing the risk of wildfires.

Shrubland: Shrubland is a plant community dominated by shrubs, often with grasses, herbs, and geophytes. It can occur naturally or result from human activity. It can be a mature vegetation type or a transitional community after a disturbance like fire. The stability may be maintained by regular disturbances or browsing. Shrubland can be unsuitable for human habitation due to the risk of fire. Coined in 1903.

Tundra: Tundra refers to a treeless biome hindered by frigid temperatures and short growing seasons. It derives from the Finnish word meaning "treeless plain". Three distinct regions exist: Arctic, alpine, and Antarctic tundra.

Forest: A forest is a land area with dominant tree presence. Definitions of forests vary worldwide, considering factors such as tree density, height, land use, legal standing, and ecological function. According to the Food and Agriculture Organization (FAO), a forest is land covering over 0.5 hectares, with trees higher than 5 meters and canopy cover exceeding 10 percent, excluding agricultural or urban land. In 2020, forests covered approximately 31 percent of the world's land, covering 4.06 billion hectares.

Rainforest: Rainforests are lush forests with unbroken tree canopies, consisting of moisture-reliant plants, epiphytes, and lianas, while lacking wildfires. They are categorized as tropical or temperate, with various other classifications existing.

Tropical rainforest: A tropical rainforest is a type of forest found within a specific climate zone, characterized by constant rainfall and no dry season. It is located between 10 degrees north and south of the equator. These rainforests are part of the larger tropical forest biome and are known for their lush vegetation and diverse wildlife. They are classified as tropical moist broadleaf forests and can be found in areas where the average precipitation is at least 60 mm.

Taiga: The taiga, also known as the boreal forest or snow forest, is a biome dominated by coniferous trees like pines, spruces, and larches. It is primarily found in North America and is characterized by its cold climate and extensive evergreen forests.

Temperate broadleaf and mixed forests: Temperate broadleaf and mixed forests refer to a terrestrial habitat type characterized by the World Wide Fund for Nature. It encompasses regions with broadleaf trees, mixed with conifer and broadleaf trees in coniferous forests.

Jungle: A jungle is a dense forest with tangled vegetation found in tropical climates. Its definition has changed over the past century.

Grassland: Grasslands are areas dominated by grasses, but also include sedges, rushes, and other plants. They exist on all continents except Antarctica, covering a significant portion of the Earth's land. Grasslands come in various types, including natural, semi-natural, and agricultural. They are among the largest biomes globally, making up 31-69% of the world's land area.

Meadow: A meadow is an open field with grasses and non-woody plants. It can have a few trees or shrubs but must remain open. Meadows can occur naturally or be created by clearing shrubs or woodlands. They are often used for hay, fodder, or livestock. These habitats are semi-natural grasslands with native species and limited human intervention.

Prairie: Prairies are temperate grassland ecosystems with moderate rainfall and dominated by grasses, herbs, and shrubs rather than trees. They are found mainly in North America, including the Great Plains, as well as in regions like Argentina, Brazil, Uruguay, Ukraine, Russia, and Kazakhstan. This biome encompasses the Interior Lowlands of Canada, the United States, and Mexico.

Savanna: A savanna is a type of ecosystem with a mix of woodlands and grasslands, characterized by widely spaced trees that do not form a closed canopy. The open canopy allows enough light to reach the ground, supporting a layer of grasses. There are four forms of savanna: savanna woodland with a light canopy of trees and shrubs, tree savanna with scattered trees and shrubs, shrub savanna with distributed shrubs, and grass savanna with minimal trees and shrubs.

Steppe: A steppe is a grassland region without dense forests, typically found near rivers and lakes. It includes montane, tropical/subtropical, and temperate grassland biomes.

Wetland: A wetland is a unique ecosystem that is flooded or saturated by water for extended periods. It is characterized by anoxic hydric soils and vegetation adapted to these conditions. Wetlands are highly biodiverse and support a wide range of plant and animal species. Assessment methods have been developed to conserve and protect wetlands worldwide. Constructed wetlands are purposefully designed to treat wastewater and manage stormwater in urban areas.

Bog: A bog is a type of wetland that collects peat from dead plants, usually mosses like sphagnum moss. It is one of the main types of wetlands and is also called mire, mosses, quagmire, or muskeg. Bogs can be found in forests and are often covered with heath or heather shrubs. They act as carbon sinks by gradually storing decayed plant material.

Mangrove: Mangroves are shrubs or trees that thrive in coastal saline or brackish water. They possess unique adaptations to absorb oxygen and eliminate salt, enabling them to handle harsh conditions. Mangroves are found in tropical regions worldwide, between 30° N and 30° S latitude, particularly near the equator. These taxonomically diverse plants emerged during the Late Cretaceous to Paleocene epochs and have spread due to tectonic plate movements. The earliest known mangrove palm fossils date back 75 million years.

Marsh: A marsh is a wetland dominated by herbaceous plants, not trees. It refers to low-lying and seasonally waterlogged areas and can include drained meadows and embanked polderlands.

Swamp: A swamp is a forested wetland that exists as a transition zone between land and water. They come in various sizes and are located worldwide, with fresh, brackish, or seawater. Freshwater swamps rely on rainwater and flooding to maintain water levels, while saltwater swamps are found in tropical and subtropical coasts. Swamps can have dry-land protrusions covered by water-tolerant vegetation. They can be classified as true forests or shrub swamps. In Canada, swamps are colloquially referred to as bogs, fens, or muskegs in boreal regions. Major rivers like the Amazon, Mississippi, and Congo have some of the world's largest swamps.

Climatology: Climatology, also known as climate science, studies Earth's climate by examining weather conditions averaged over 30 years or more. It explores climate variability, mechanisms of climate change, and modern climate change. Climatology is a subdivision of physical geography and is part of the atmospheric sciences. Additionally, it incorporates aspects of oceanography and biogeochemistry.

El Niño–Southern Oscillation: El Niño–Southern Oscillation (ENSO) is a weather phenomena that occurs irregularly, affecting winds and sea surface temperatures in the tropical eastern Pacific Ocean. It influences the climate in the tropics and subtropics. El Niño refers to a warming phase, while La Niña is the cooling phase. The Southern Oscillation is the atmospheric component linked to the sea temperature change. El Niño is associated with high air surface pressure in the tropical western Pacific, and La Niña with low air surface pressure there. These periods typically last several months and happen every few years with varying intensity. The mechanisms behind this oscillation are still being studied.

Köppen climate classification: The Köppen climate classification, developed by Wladimir Köppen, is a widely used system for classifying different climates. It has been modified over the years by Köppen and Rudolf Geiger, and is also known as the Köppen-Geiger climate classification.

Climate: Climate is the long-term weather pattern, encompassing mean and variability of meteorological factors such as temperature, humidity, pressure, wind, and precipitation. It is influenced by geographic factors like latitude, longitude, altitude, terrain, water bodies, and their currents. Climate integrates the components of the climate system, including the atmosphere, hydrosphere, cryosphere, lithosphere, and biosphere.

Temperate climate: Temperate climate refers to the weather conditions found in the middle latitudes, between the tropics and polar regions. It is characterized by wider temperature ranges and distinct seasonal changes compared to tropical climates, where variations are typically small and less noticeable.

Tropical climate: Tropical climate, classified as group A in the Köppen climate classification, is characterized by hot temperatures throughout the year and a minimum monthly average temperature of 18 °C (64.4 °F). It experiences abundant annual precipitation with a rhythmic seasonal pattern, although varying degrees of dryness may occur. This climate has two distinct seasons, a wet season and a dry season, and typically has a narrow annual temperature range. Additionally, tropical climates are known for their intense sunlight.

Climate change: Climate change refers to the ongoing global warming and its impact on Earth's climate system. This includes previous long-term changes to the climate. Human activities, such as burning fossil fuels and deforestation, contribute to the rapid increase in global temperatures. This is primarily due to the release of greenhouse gases like carbon dioxide and methane, which trap heat in Earth's atmosphere, resulting in global warming.

Climate variability and change: Climate variability encompasses all climate variations lasting longer than individual weather events, while climate change specifically encompasses persistent variations lasting decades or more. It refers to both historical and contemporary changes, with a notable focus on current global warming. Human activities, particularly since the Industrial Revolution, have significantly influenced the climate.

Greenhouse effect: The greenhouse effect is the trapping of heat by greenhouse gases in a planet's atmosphere, which raises its temperature. Stars emit shortwave radiation that passes through greenhouse gases, but planets emit longwave radiation that is partly absorbed by greenhouse gases. This reduces the rate at which a planet can cool off and adds to the planet's average surface temperature.

Season: A season is a period of the year characterized by changes in weather, daylight hours, and ecological patterns. These changes occur due to the Earth's tilted orbit around the Sun. The varying intensity of sunlight affects animal behavior and plant growth. Different cultures have different definitions of seasons, leading to variations in their number and nature.

Spring (season): Spring, or springtime, is one of the four temperate seasons. It follows winter and comes before summer. Its definition may vary depending on local climate and customs. In the Northern Hemisphere, spring coincides with autumn in the Southern Hemisphere. During spring equinox, day and night are roughly equal, but days lengthen and nights shorten as the season progresses until the Summer Solstice.

Summer: Summer is the hottest season, following spring and preceding autumn. It features the longest daylight hours and shortest darkness hours, with decreasing day length after the summer solstice. The earliest sunrises and latest sunsets happen during this time. The start of summer varies based on climate, tradition, and culture. Additionally, it is winter in the Southern Hemisphere while summer occurs in the Northern Hemisphere.

Autumn: Autumn, also known as fall, is one of the four temperate seasons and marks the transition from summer to winter. It is characterized by shorter daylight hours, cooler temperatures, and the iconic change in leaf color for deciduous trees.

Winter: Winter is the year's coldest and darkest season in polar and temperate climates. It follows autumn and precedes spring. Earth's axis tilt causes seasons, with winter happening when a hemisphere faces away from the Sun. The start of winter varies across cultures and can be based on weather.

Atmosphere of Earth: The Earth's atmosphere is a layer of gases surrounding the planet, kept in place by gravity. It creates pressure, shields us from meteoroids and harmful solar radiation, regulates temperature, and enables the existence of life and liquid water on the planet's surface.

Air mass: An air mass is a large volume of air defined by temperature and humidity, spanning hundreds or thousands of square miles. It adapts to the surface below it and is classified based on source region and latitude. Colder air masses are polar or arctic, while warmer ones are tropical. Continental and superior air masses are dry, while maritime and monsoon air masses are moist. Weather fronts separate air masses with different densities. As air masses move away from source regions, their characteristics can quickly change due to vegetation and water bodies. Classification schemes analyze an air mass's features and modifications.

Atmospheric pressure: Atmospheric pressure, also called air pressure or barometric pressure, refers to the pressure within the Earth's atmosphere. It can be measured using various units such as pascal (Pa), hectopascal (hPa), millibar (mbar), millimeter of mercury (mm Hg), or pounds per square inch (psi). The standard atmosphere is defined as 101,325 Pa, which roughly corresponds to the average sea-level atmospheric pressure on Earth.

Atmospheric science: Atmospheric science is the study of the Earth's atmosphere and its physical processes. It includes meteorology for weather forecasting, climatology for studying climate changes, and aeronomy for the upper layers of the atmosphere. It has also expanded to include planetary science and the study of atmospheres in the Solar System.

Ozone depletion: Ozone depletion refers to the decrease in Earth's atmospheric ozone, with two notable events observed since the late 1970s. The first is a gradual four percent decline in total ozone levels globally, while the second is a significant reduction in stratospheric ozone specifically around the polar regions during spring, known as the ozone hole. Additionally, springtime polar tropospheric ozone depletion events occur alongside these stratospheric events.

Aurora: Aurora, known as the northern or southern lights, is a captivating natural light phenomenon visible in high-latitude areas. These displays showcase stunning patterns of radiant curtains, rays, spirals, and flickering lights that illuminate the entire sky.

Mirage: A mirage is a natural optical phenomenon where light rays bend, creating a displaced image of faraway objects or the sky. It derives from the French word "mirer" and Latin word "mirari," meaning "to look at, to wonder at."

Rainbow: A rainbow, caused by light's refraction, reflection, and dispersion in water droplets, is a multicolored circular arc in the sky. It appears opposite the Sun and can be formed by rain, mist, spray, or dew.

Sky: The sky refers to the view upward from Earth's surface, encompassing the atmosphere, outer space, and serving as a distinct realm between the ground and outer space.

Meteorology: Meteorology is the study of weather forecasting and atmospheric sciences. Its origins date back to ancient times, but significant progress began in the 18th century. The 19th century saw advancements through weather observation networks. Historical data was previously relied upon for weather prediction. Breakthroughs in weather forecasting happened in the latter half of the 20th century with the development of computers and understanding of physics. Marine weather forecasting is an important branch, considering maritime and coastal safety, along with atmospheric interactions and large bodies of water.

Weather: Weather is the condition of the atmosphere, encompassing temperature, precipitation, and other elements. It determines whether it is hot or cold, wet or dry, calm or stormy, and clear or cloudy. Weather pertains to day-to-day atmospheric conditions, mainly occurring in the troposphere. Climate refers to longer-term averages of these conditions. "Weather" typically refers to Earth's atmospheric conditions.

Weather front: A weather front is a boundary that separates air masses with different characteristics like density, wind, temperature, and humidity. It often causes disturbed and unstable weather, leading to thunderstorms, precipitation, fog, and wind shifts. Dry lines in summer can trigger severe weather, while some fronts may not produce precipitation or cloudiness.

Weather forecasting: Weather forecasting is the scientific prediction of atmospheric conditions at a specific place and time. It has been practiced both informally for centuries and formally since the 19th century.

Humidity: Humidity refers to the amount of water vapor in the air. It is not visible to the naked eye, but plays a role in determining the possibility of precipitation, dew, or fog.

Low-pressure area: A low-pressure area is a region with lower atmospheric pressure than its surroundings. It typically brings bad weather, while high-pressure areas have calmer conditions. In the northern hemisphere, winds circle counterclockwise around lows due to Coriolis forces. Low-pressure systems form when wind divergence occurs in the upper atmosphere, known as cyclogenesis. Divergence can occur on the east side of upper troughs or ahead of smaller wavelength embedded shortwave troughs.

Cloud: A cloud is a visible mass of tiny liquid droplets, frozen crystals, or particles suspended in the atmosphere. It can form when air is cooled to its dew point or gains enough moisture to reach the ambient temperature. Water and other chemicals can make up the droplets and crystals.

Cirrus cloud: Cirrus clouds are high, ice crystal clouds that appear delicate and wispy with white strands. They form when warm, dry air rises and water vapor deposits onto dust particles at high altitudes. Found globally between 4,000 and 20,000 meters above sea level, with higher elevations in the tropics and lower elevations in polar regions.

Cumulonimbus cloud: A cumulonimbus cloud is a dense, towering vertical cloud that forms from condensation of water vapor in the lower troposphere. It carries upward by powerful air currents and turns into ice crystals, causing hail and lightning. These thunderheads can form alone, in clusters, or along squall lines, and they can produce severe weather like tornadoes, strong winds, and large hailstones. They develop from overdeveloped cumulus congestus clouds and are abbreviated as Cb.

Cumulus cloud: Cumulus clouds are low-level clouds with a flat base and a puffy, cotton-like appearance. The name "cumulus" comes from Latin, meaning "heap" or "pile". They typically form below 2,000 m in altitude and can appear individually, in groups, or in lines.

Fog: Fog is a misty cloud formed by small water droplets or ice crystals that hovers close to the Earth's surface. It often resembles stratus clouds and is influenced by water bodies, terrain, and wind. Fog significantly impacts activities like shipping, travel, and warfare.

Precipitation: Precipitation, in meteorology, refers to the condensation of atmospheric water vapor that falls from clouds due to gravity. It takes various forms such as drizzle, rain, sleet, snow, ice pellets, graupel, and hail. Precipitation occurs when the atmosphere becomes saturated with water vapor, leading to its condensation and subsequent falling. This process is distinct from fog and mist, as they do not condense enough to precipitate. Air can become saturated through cooling or adding water vapor. Precipitation forms when smaller droplets merge with other raindrops or ice crystals in a cloud. Showers are brief intense periods of rain occurring in scattered locations.

Rain: Rain is condensed water vapor that falls to the ground due to gravity. It plays a vital role in the water cycle by providing most of Earth's fresh water and supporting hydroelectric power, crop irrigation, and various ecosystems.

Acid rain: Acid rain is unusually acidic precipitation with elevated levels of hydrogen ions. It has a lower pH (4-5 avg.) compared to the neutral pH of most water (6.5-8.5). Acid rain harms plants, aquatic animals, and infrastructure. It occurs due to emissions of sulfur dioxide and nitrogen oxide reacting with atmospheric water molecules, forming acids.

Snow: Snow is formed by ice crystals suspended in the atmosphere that grow and fall to the ground, undergoing changes. It is composed of frozen crystalline water throughout its life cycle, starting as ice crystals in the atmosphere, falling and accumulating on surfaces, transforming in place, and eventually melting or disappearing.

Hail: Hail is a type of solid precipitation, made up of ice balls or irregular lumps called hailstones. It is different from ice pellets, though they are often mistaken for each other. Hailstones form and fall in warmer temperatures compared to ice pellets, as low surface temperatures hinder their growth.

Dew: Dew is moisture that forms as droplets on objects, typically in the morning or evening, when the surface temperature cools and condensation occurs.

Frost: Frost is a thin layer of ice that forms when water vapor deposits onto a freezing surface. It occurs when the air has excess water vapor for a specific temperature, similar to dew formation but below the freezing point of water.

Atmospheric circulation: Atmospheric circulation refers to the movement of air on a large scale, playing a crucial role in redistributing thermal energy across the Earth's surface. While it varies annually, the fundamental structure remains consistent. While smaller weather systems are unpredictable, making long-range predictions beyond ten days in practice or a month in theory is challenging.

Anticyclone: An anticyclone is a weather pattern characterized by wind circulation around a central area of high atmospheric pressure. In the Northern Hemisphere, winds rotate clockwise, while in the Southern Hemisphere, they rotate counterclockwise. Anticyclones bring clear skies, cooler temperatures, and drier air. Additionally, they can cause fog to form overnight.

Cyclone: A cyclone is a large air mass with low atmospheric pressure that rotates around a strong center. It has inward-spiraling winds and rotates counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. Cyclones can be polar vortices, extratropical cyclones, tropical cyclones, subtropical cyclones, mesocyclones, tornadoes, or dust devils.

Extratropical cyclone: Extratropical cyclones, also known as mid-latitude cyclones or wave cyclones, are low-pressure systems that play a significant role in shaping the Earth's weather. They can range from producing light showers to extreme weather events like gales, thunderstorms, blizzards, and tornadoes. These cyclones occur in the middle latitudes and cause rapid temperature and dew point changes along weather fronts.

Hadley cell: The Hadley cell is a tropical atmospheric circulation that involves air rising near the equator, flowing poleward near the tropopause, and descending in the subtropics. It is driven by differences in heating between the tropics and subtropics. The circulation is characterized by cells on both sides of the equator, with the Southern Hemisphere cell slightly stronger. During summer and winter, a single, cross-equatorial cell dominates. Similar circulations may exist on Venus and Mars.

Polar vortex: A polar vortex is a large, cold, rotating region of air that encircles Earth's polar regions. It exists in both the stratosphere and troposphere, rotating in the same direction as Earth but with different sizes, structures, seasonal cycles, and impacts on weather. It is also found on other low-obliquity rotating planets.

Walker circulation: The Walker circulation, also known as the Walker cell, is a model of air flow in the tropics. It describes a closed circulation of air in the zonal and vertical directions caused by heat differences between the ocean and land. This circulation is consistent with observations and is part of the larger Hadley Circulation, which also includes motion in the meridional direction.

Storm: A storm is a disturbed state of the environment or atmosphere that causes significant disruptions, such as strong winds, tornadoes, hail, thunder, lightning, and heavy precipitation. It can also involve freezing rain, dust storms, and other severe weather conditions.

Blizzard: A blizzard is a severe snowstorm with strong winds and poor visibility that lasts for several hours. Ground blizzards occur when loose ground snow is lifted and blown by strong winds. These storms can be massive, stretching over hundreds or thousands of kilometers.

Tornado: A tornado is a violently rotating column of air that connects the Earth's surface with a cumulonimbus cloud. It is commonly called a twister or whirlwind. Tornadoes vary in size and shape, often appearing as a funnel-shaped cloud with debris below. Most tornadoes have wind speeds under 180 km/h, but the most extreme ones can exceed 480 km/h. They typically travel several kilometers before dissipating but can persist over 100 km.

Tropical cyclone: A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, strong winds, and heavy rain. It has a spiral arrangement of thunderstorms and can be called different names depending on its location and strength, such as hurricane, typhoon, or tropical storm. It is referred to as a hurricane in the Atlantic and northeastern Pacific Ocean, and a typhoon in the northwestern Pacific Ocean. In the Indian Ocean and South Pacific, it is called a tropical cyclone or severe cyclonic storm.

Dust storm: A dust storm, also known as a sandstorm, occurs in arid and semi-arid areas when strong winds sweep loose sand and dirt from dry surfaces. This process, called saltation and suspension, transports fine particles by depositing them in different locations.

Lightning: Lightning is a natural phenomenon of electrostatic discharges that occur between charged regions in the atmosphere or between the atmosphere and the ground. These discharges release a high amount of energy, ranging from 200 megajoules to 7 gigajoules, and generate various forms of electromagnetic radiation, including visible light. Thunder, caused by the shock wave created during lightning, is a common outcome. Lightning is predominantly associated with thunderstorms but can also occur during volcanic eruptions, and it plays a role in the global atmospheric electrical circuit.

Thunderstorm: A thunderstorm or electrical storm is a weather phenomenon characterized by lightning and thunder. It occurs in cumulonimbus clouds and can be accompanied by strong winds and heavy precipitation, including snow, sleet, or hail. Some thunderstorms form a line or squall line, while others rotate like cyclones, known as supercells. Severe thunderstorms can produce dangerous weather conditions like large hail, strong winds, and even tornadoes. Vertical wind shear can cause deviations in their course.

Wind: Wind is the movement of air or gases on a planet's surface. It occurs on various scales, from short-term thunderstorm flows to longer-lasting local and global winds. These winds are primarily caused by differential heating and the planet's rotation. Factors such as terrain, plateaus, and coastlines can also influence wind patterns.

Jet stream: The jet stream is a fast-flowing, narrow air current found in the atmospheres of several planets. On Earth, it is located near the tropopause and moves from west to east. It can change direction, split into multiple streams, or combine into a single current.

Monsoon: A monsoon is a seasonal wind pattern that brings changes in rainfall. It is associated with the movement of the Intertropical Convergence Zone between the northern and southern limits of the equator. The term is mainly used to refer to the rainy phase of the seasonal pattern, but there is also a dry phase. Occasionally, it can describe intense but brief local rainfall events.

Trade winds: The trade winds are permanent east-to-west prevailing winds in the equatorial region of Earth. They blow from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere. Trade winds have been utilized by sailors for centuries to navigate and explore the world's oceans, facilitating European colonization of the Americas and the establishment of trade routes across the Atlantic and Pacific Oceans.

Geology: Geology is the scientific study of the Earth, rocks, and the processes that shape them over time. It is closely related to other Earth sciences and is connected to Earth system science and planetary science.

Internal structure of Earth: The Earth's internal structure is composed of layers: a solid crust, viscous asthenosphere, solid mantle, liquid outer core, and solid inner core. The flow of the outer core generates the Earth's magnetic field. It excludes the atmosphere and hydrosphere.

Earth's inner core: The Earth's inner core is the innermost layer of our planet, which is a solid sphere measuring about 1,220 km (760 mi) in radius. It constitutes around 20% of Earth's total radius or about 70% of the Moon's radius.

Earth's outer core: The Earth's outer core is a fluid layer made up mostly of iron and nickel. It is about 2,260 km thick and located between the solid inner core and the mantle. Starting at the core-mantle boundary, it extends 2,889 km below the Earth's surface and ends 5,150 km deep at the inner core boundary.

Mantle (geology): The mantle in geology refers to a layer between a planet's core and crust. It consists of rock or ices and is the largest and most massive layer in the planet. Mantles are found in planetary bodies that have undergone density differentiation. They are present in terrestrial planets, certain asteroids, and some planetary moons.

Geophysics: Geophysics is a scientific field that explores the physical processes and properties of the Earth and its surroundings. Geophysicists use quantitative methods to analyze various aspects of the planet's structure, composition, dynamics, and surface expressions. It encompasses solid earth applications, such as studying Earth's shape, gravitational and magnetic fields, as well as its internal structure. However, the definition has expanded to include a broader range, spanning the water cycle, fluid dynamics of oceans and atmosphere, electricity and magnetism in different atmospheric layers, solar-terrestrial physics, and even celestial bodies like the Moon and other planets.

Earth's magnetic field: Earth's magnetic field, or geomagnetic field, is a magnetic force field extending from Earth's interior into space. It interacts with the solar wind and is generated by electric currents caused by the motion of molten iron and nickel in Earth's outer core. This occurs as heat escapes from the core, creating a geodynamo.

Geodesy: Geodesy is the study of measuring and representing Earth's changing 3D geometry, gravity, and spatial orientation. It also encompasses planetary geodesy, which examines similar aspects of other astronomical bodies.

Seismology: Seismology is the study of earthquakes and how elastic waves travel through the Earth. It examines various seismic sources like volcanoes, tectonic activities, and human-induced processes. Seismologists also study environmental effects such as tsunamis. Paleoseismology uses geology to understand past earthquakes. Seismograms, created by seismographs, record Earth's motion over time. Seismologists are scientists specializing in this field.

Earthquake: Summary: An earthquake, also known as a quake or tremor, occurs when energy is suddenly released in the Earth's lithosphere, causing seismic waves. They vary in intensity, from imperceptible to destructive, damaging infrastructure and propelling objects and people. Seismic activity refers to the frequency, type, and size of earthquakes in a specific area over time. Seismicity is the average rate of energy release in a particular location. The term tremor can also describe non-earthquake seismic rumbling.

Geological history of Earth: The geological history of Earth is the study of major events that have occurred over the planet's 4.54 billion year existence. It is based on the study of rock layers and follows a chronological measurement system called stratigraphy. Earth formed through the accumulation of dust and gas from the solar nebula, which also gave rise to the rest of the Solar System.

Geochronology: Geochronology is the science of determining the age of rocks and fossils using their inherent signatures. Radioactive isotopes enable absolute geochronology, while relative geochronology relies on tools like paleomagnetism and stable isotope ratios. Combining multiple indicators improves the precision of age determination.

Great Oxidation Event: The Great Oxidation Event (GOE) was a period in Earth's history around 2.460-2.426 billion years ago, when the atmosphere and shallow ocean experienced a significant increase in oxygen concentration. This event, also known as the Oxygen Catastrophe or Oxygen Revolution, transformed the atmosphere from a weakly reducing state to an oxidizing one. This change occurred due to the accumulation of biologically produced molecular oxygen, gradually raising oxygen levels to about 10% of today's atmosphere by the end of the GOE.

Cambrian explosion: The Cambrian explosion was a sudden and rapid increase in the number of complex life forms, occurring approximately 538.8 million years ago. This 13-25 million-year period marked the appearance of almost all major animal phyla in the fossil record, leading to the diversification of modern metazoan phyla. It also triggered significant diversification in other groups of organisms.

Late Ordovician mass extinction: The Late Ordovician mass extinction (LOME) occurred 445 million years ago and is considered the second-largest extinction event in terms of the percentage of genera lost. It affected all major taxonomic groups, causing the extinction of 49-60% of marine genera and nearly 85% of marine species. Numerous marine organisms, such as brachiopods, bryozoans, conodonts, trilobites, echinoderms, corals, bivalves, and graptolites, disappeared. Despite its severity, it didn't significantly alter ecosystem structures or lead to major morphological innovations. Biodiversity gradually recovered over the first 5 million years of the subsequent Silurian period.

Late Devonian extinction: The Late Devonian extinction, one of the five largest mass extinctions in Earth's history, refers to two major extinction events. The first event, known as the Kellwasser event or Frasnian-Famennian extinction, happened around 372 million years ago, causing the extinction of 19% of all families and 50% of all genera. The second event, called the Hangenberg event or end-Devonian extinction, occurred 359 million years ago, marking the end of the Famennian and Devonian periods and the transition into the Carboniferous Period.

Permian–Triassic extinction event: The Permian-Triassic extinction event occurred about 251.9 million years ago, marking the boundary between the Permian and Triassic periods. It is the most severe known extinction event on Earth, resulting in the extinction of 57% of biological families, 83% of genera, 81% of marine species, and 70% of terrestrial vertebrate species. This event also led to the largest mass extinction of insects. It is considered the largest of the "Big Five" mass extinctions, and there is evidence for multiple distinct pulses or phases of extinction.

Triassic–Jurassic extinction event: The Triassic-Jurassic Extinction Event (TJME) occurred 201.4 million years ago, marking the shift between the Triassic and Jurassic periods. It is ranked among the top five major extinction events in history, significantly impacting life both on land and in the oceans. Many marine species, including the entire class of conodonts and 23-34% of marine genera, vanished. On land, all archosauromorphs (excluding crocodylomorphs, pterosaurs, and dinosaurs) became extinct, along with previously abundant groups like aetosaurs, phytosaurs, and rauisuchids. Some terrestrial animals had already disappeared before the event, but there is uncertainty due to limited fossils from the Late Triassic. Notably, plants, crocodylomorphs, dinosaurs, pterosaurs, and mammals were largely unaffected. This allowed dinosaurs, pterosaurs, and crocodylomorphs to dominate the land for the next 135 million years.

Cretaceous–Paleogene extinction event: The Cretaceous-Paleogene extinction event, also known as the K-T extinction, occurred approximately 66 million years ago and caused the extinction of 75% of plant and animal species on Earth. This event led to the complete extinction of non-avian dinosaurs and most large tetrapods, except for some ectothermic species. It marked the end of the Cretaceous period and the Mesozoic era, while ushering in the Cenozoic era, which continues today.

Pangaea: Pangaea was a supercontinent that formed 335 million years ago from Gondwana, Euramerica, and Siberia. It began to break apart 200 million years ago, with its landmass centered on the equator. Pangaea was surrounded by the superocean Panthalassa and the Paleo-Tethys and subsequent Tethys Oceans. It is the most recent supercontinent and the first to be reconstructed by geologists.

Geologic time scale: The geologic time scale is a chronological dating system used by Earth scientists to describe the timing and relationships of events in Earth's history based on the rock record. It is developed through the study of rock layers and their identifying features like fossils and paleomagnetic properties. The International Commission on Stratigraphy is responsible for defining standardized international units of geologic time, which are used to define divisions of geologic time.

Precambrian: The Precambrian is the earliest part of Earth's history, accounting for 88% of its geologic time. It preceded the Phanerozoic Eon and is named after its successor, the Cambrian period. Rocks from this age were first studied in Wales.

Phanerozoic: The Phanerozoic is the most recent eon in Earth's geologic time scale, spanning from 538.8 million years ago to present. It is known for the proliferation and diversification of animal and plant life, which colonized different habitats on Earth's surface. It started with the Cambrian period, when animals developed hard shells that left clear fossil records. The time preceding the Phanerozoic is referred to as the Precambrian and is divided into the Hadean, Archaean, and Proterozoic eons.

Paleozoic: The Paleozoic Era is the first of three geological eras in the Phanerozoic Eon, lasting from 538.8 to 251.9 million years ago. It follows the Neoproterozoic era and precedes the Mesozoic Era. The Paleozoic is divided into six geologic periods.

Cambrian: The Cambrian Period, part of the Paleozoic Era, marks the beginning of the Phanerozoic Eon. Lasting about 53.4 million years, it started after the Ediacaran Period around 538.8 million years ago and ended at the start of the Ordovician Period 485.4 million years ago. Important details regarding its subdivisions and base remain somewhat uncertain.

Permian: The Permian is a geologic period that lasted 47 million years, marking the end of the Paleozoic Era and the beginning of the Mesozoic Era. It occurred between 298.9 and 251.902 million years ago. The term was coined by Sir Roderick Murchison in 1841, naming it after the Perm region in Russia.

Mesozoic: The Mesozoic Era, lasting from 252 to 66 million years ago, was a period characterized by the dominance of gymnosperms and dinosaurs. It had a hot greenhouse climate and marked the tectonic break-up of Pangaea. The Mesozoic Era was the middle era since complex life evolved, sandwiched between the Paleozoic and the Cenozoic.

Triassic: The Triassic is a geologic period lasting 50.5 million years, bridging the gap between the Permian and Jurassic periods. It marks the start of the Mesozoic Era and is characterized by major extinction events. Divided into Early, Middle, and Late epochs, it is the first and shortest period of the Mesozoic Era.

Jurassic: The Jurassic, from 201.4 to 145 million years ago, is a significant geologic period within the Mesozoic Era. It is associated with the Jura Mountains, where limestone strata from this period were first recognized.

Cretaceous: The Cretaceous, the longest period in the Mesozoic Era, lasted from about 145 to 66 million years ago. It is characterized by its abundance of chalk and is abbreviated as K.

Cenozoic: The Cenozoic is the current geological era, covering the past 66 million years. It is characterized by the dominance of mammals, birds, and angiosperms. It follows the Mesozoic and Paleozoic eras and began with the extinction event that wiped out non-avian dinosaurs, primarily caused by the impact of a large asteroid called the Chicxulub impactor.

Paleogene: The Paleogene is a geologic period lasting 43 million years, starting from the end of the Cretaceous Period 66 million years ago to the beginning of the Neogene Period 23.03 million years ago. It marks the start of the Cenozoic Era in the current Phanerozoic Eon. The Paleogene was previously referred to as the Tertiary Period and is sometimes still informally called that. It is commonly abbreviated as "Pg".

Neogene: The Neogene is a geological period that lasted for about 20 million years, starting from 23 million years ago and ending about 2.5 million years ago. It is divided into two epochs: the Miocene and the Pliocene. Some geologists argue that it is challenging to distinguish the Neogene from the Quaternary period. The term "Neogene" was coined in 1853 by Moritz Hörnes, an Austrian paleontologist. Previously, the Tertiary Period was used to describe the time period that now includes both the Paleogene and Neogene, although it is no longer an officially recognized term.

Quaternary: The Quaternary is the most recent period of the Cenozoic Era, beginning 2.58 million years ago. It consists of two epochs, the Pleistocene and the Holocene, but the proposed Anthropocene epoch is not yet officially recognized.

Holocene: The Holocene is the present geological epoch that started about 9,700 years ago. It follows the Last Glacial Period and marks the retreat of glaciers. It is part of the Quaternary period and corresponds to the current warm period known as MIS 1. Some consider it an interglacial period within the Pleistocene Epoch, referred to as the Flandrian interglacial.

Mineral: A mineral is a naturally occurring solid substance with a distinct chemical composition and crystal structure. It is found in its pure form and is studied in geology and mineralogy.

Mineralogy: Mineralogy is a branch of geology that focuses on the scientific study of minerals and mineralized artifacts. It includes analyzing their chemical composition, crystal structure, and physical properties. Specific areas of study in mineralogy include understanding how minerals form, classifying them, determining their distribution across various locations, and exploring their practical uses.

Gemstone: Gemstones are mineral crystals used for making jewelry. Some non-mineral materials are also considered gemstones. They can be hard or soft, chosen for their aesthetics. Rarity and fame add value to gemstones.

Sapphire: Sapphire is a precious gem derived from corundum, usually blue but available in other colors like yellow, purple, orange, and green. It is also used in non-ornamental applications due to its hardness, including infrared optical components and electronic wafers. Sapphires are often cut into gemstones for jewelry and can be artificially created. They are the birthstone for September and commemorate the 45th anniversary. A sapphire jubilee takes place after 65 years.

Ruby: Ruby is a durable, pinkish red gemstone made of corundum. It is a popular choice for traditional jewelry and is part of the cardinal gems. The color is attributed to chromium, and the word 'ruby' is derived from the Latin term for red.

Asbestos: Asbestos is a natural mineral made up of thin fibrous crystals. When disturbed, these fibers can be released into the air and inhaled, causing serious lung conditions like mesothelioma, asbestosis, and lung cancer. Because of these health risks, asbestos is considered a significant hazard to health and safety.

Emerald: Emerald is a green gemstone formed from beryl, containing trace amounts of chromium or vanadium. It has a hardness of 7.5-8 on the Mohs scale and is known for its poor toughness due to trapped materials during formation. Emerald is classified as a cyclosilicate.

Pyroxene: Pyroxene minerals are essential components of many types of rocks. They have a chemical formula XY(Si,Al)2O6, with X representing Ca, Na, Fe, Mg, and sometimes other elements like Zn, Mn, or Li, and Y representing smaller ions like Cr, Al, Mg, Co, Mn, Sc, Ti, V, or Fe. Unlike other silicate minerals, pyroxenes have limited substitution of aluminum for silicon. They possess a common structure of single chains of silica tetrahedra. Clinopyroxenes crystallize in the monoclinic system, while orthopyroxenes crystallize in the orthorhombic system.

Jade: Jade is a type of ornamental rock used for jewelry and ornaments. It is categorized into two types: nephrite and jadeite. Nephrite is typically green but can also be yellow, white, or black. Jadeite comes in various colors, including green, lavender, yellow, orange, brown, and rarely blue. However, the names "nephrite" and "jadeite" are technically incorrect as they refer to rock aggregates rather than specific minerals. Nephrite was officially replaced as a mineral species name in 1978, while jadeite is a legitimate mineral species. In China, the traditional name for jadeite is "fei cui," which predates its official name.

Mica: Mica is a group of silicate minerals known for their ability to split into thin, elastic plates. It is commonly found in igneous and metamorphic rocks, with occasional flakes in sedimentary rock. Mica is prominent in granites, pegmatites, and schists, and massive mica formations have been discovered in certain pegmatites.

Kaolinite: Kaolinite, also known as kaolin, is a clay mineral composed of Al2Si2O5(OH)4. It is a layered silicate mineral with one sheet of silica connected to one sheet of alumina through oxygen atoms.

Talc: Talc is a clay mineral containing hydrated magnesium silicate (Mg3Si4O10(OH)2). It is commonly used in powdered form, often mixed with corn starch, as baby powder. Talc is also used as a thickening agent, lubricant, and important ingredient in ceramics, paints, and roofing materials. It is widely used in cosmetics and can be found as foliated to fibrous masses or in a rare crystal form. Talc has a perfect basal cleavage, an uneven flat fracture, and a two-dimensional platy structure.

Quartz: Quartz is a hard mineral made of silicon dioxide. Its atoms form a continuous framework of silicon-oxygen tetrahedra, resulting in its chemical formula, SiO2. Quartz is Earth's second most abundant mineral and is found in the continental crust, second only to feldspar.

Feldspar: Feldspar is a group of minerals that form rocks and contain aluminium tectosilicate. They commonly have other cations like sodium, calcium, or potassium. The group includes plagioclase and alkali feldspars. Feldspars make up around 60% of the Earth's crust and 41% of the continental crust by weight.

Gypsum: Gypsum is a soft mineral containing calcium sulfate dihydrate (CaSO4·2H2O). It is extensively mined and commonly used in fertilizers, plaster, drywall, and chalk. Gypsum can form translucent selenite crystals and is created through the evaporation of minerals or as a hydrated product of anhydrite. Its hardness is rated 2 on the Mohs scale.

Petrology: Petrology is a branch of geology that focuses on the study of rocks and the conditions of their formation. It comprises three subdivisions: igneous, metamorphic, and sedimentary petrology. The former two are often taught together due to their reliance on chemistry and phase diagrams. Conversely, sedimentary petrology is taught alongside stratigraphy as it explores the processes involved in forming sedimentary rocks. Modern sedimentary petrology is increasingly incorporating chemistry into its methodologies.

Rock (geology): Rocks are naturally occurring solid masses or aggregates made up of minerals or mineraloid matter. They vary in composition, formation, and mineral content. Rocks make up the Earth's crust and most of its interior, excluding the liquid outer core and pockets of magma. Studying rocks involves various aspects of geology, such as petrology and mineralogy. This field can encompass rocks found on Earth or include planetary geology, examining rocks from other celestial objects.

Ore: Ore is rock or sediment with valuable minerals above normal levels, usually metals, that can be profitably mined and sold. The concentration of desired materials in ore determines its grade. The value of minerals must surpass extraction costs to be considered ore. Complex ore contains multiple valuable minerals.

Igneous rock: Igneous rock is a primary rock type, formed by magma or lava cooling and solidifying. It is one of the three main rock types, alongside sedimentary and metamorphic rocks.

Basalt: Basalt is a common extrusive igneous rock found on Earth, as well as on other planets and moons in the Solar System. It forms from rapidly cooled lava with high magnesium and iron content. About 90% of volcanic rock on Earth is basalt. It is chemically similar to gabbro, a coarse-grained rock. Geologists observe basalt lava eruptions at around 20 volcanoes per year. Basalt covers a significant portion of Venus and the lunar maria, while also being present on the surface of Mars.

Granite: Granite is a common type of igneous rock found in the Earth's crust. It is composed mainly of quartz, alkali feldspar, and plagioclase. Granite forms underground from slowly cooling magma with high silica and alkali metal content. It can be found in various sizes, ranging from small dikes to large batholiths spanning hundreds of square kilometers.

Tuff: Tuff is a solid rock formed from volcanic ash expelled during eruptions. It is classified as tuff if it contains over 75% ash, and tuffaceous if it has 25% to 75% ash. Tuff composed of sandy volcanic material is known as volcanic sandstone.

Magma: Magma is molten material beneath Earth's surface, forming igneous rocks. It exists on other planets and satellites too. Apart from molten rock, magma can contain crystals and gas bubbles.

Metamorphic rock: Metamorphic rocks form when existing rocks undergo metamorphism, a process that involves high temperatures and pressures. This results in significant physical and chemical changes, leading to the formation of a new rock with different minerals and texture. The original rock, known as a protolith, can be igneous, sedimentary, or another metamorphic rock.

Schist: Schist is a metamorphic rock with a medium grain size and distinct schistosity. It splits easily into thin flakes due to its high content of platy minerals like mica, talc, chlorite, or graphite. These minerals are alternated with granular minerals like feldspar or quartz.

Marble: Marble is a metamorphic rock formed from carbonate minerals, such as calcite or dolomite, due to heat and pressure. It has a crystalline texture and is usually not layered, except for rare cases.

Gneiss: Gneiss is a prevalent metamorphic rock resulting from intense heat and pressure acting on igneous or sedimentary rocks. It develops at higher temperatures and pressures compared to schist. Notably, gneiss exhibits a distinct banded texture with alternating darker and lighter colored bands, lacking cleavage.

Slate: Slate is a metamorphic rock formed from shale or volcanic ash through low-grade metamorphism. It has a fine-grained, homogeneous structure and is the finest-grained foliated metamorphic rock. Its foliation occurs perpendicular to the direction of compression, which may not align with the original sedimentary layering.

Sedimentary rock: Sedimentary rocks are formed by the accumulation of mineral or organic particles on Earth's surface, followed by cementation. These particles, called sediment, come from weathering, erosion, volcanic activity, or dead organisms. Agents like water, wind, ice, or mass movement transport the sediment to its deposition location. Sedimentation can also occur when minerals precipitate from water solution.

Limestone: Limestone is a carbonate sedimentary rock and the main source of lime. It is composed of calcite and aragonite, crystal forms of CaCO3. Limestone forms when these minerals precipitate from calcium-rich water. This can occur through biological and nonbiological processes, with biological accumulation being significant for the past 540 million years. Limestone often contains fossils, providing insights into ancient environments and the evolution of life.

Oil shale: Oil shale is a sedimentary rock rich in kerogen, from which liquid hydrocarbons can be extracted. It also contains inorganic substances and bitumens. Oil shales are categorized as marine, lacustrine, or terrestrial based on their deposition environment. They differ from oil-bearing shales, which hold petroleum and are drilled for extraction. Oil shale should not be confused with tight oil, often referred to as shale oil.

Sandstone: Sandstone is a sedimentary rock consisting of sand-sized silicate grains, making up around 20–25% of all sedimentary rocks.

Conglomerate (geology): Conglomerate is a type of sedimentary rock made up of round to subangular gravel-sized fragments called clasts. It usually contains finer-grained sediments like sand, silt, or clay that fill the spaces between the clasts. The clasts and matrix are held together by substances like calcium carbonate, iron oxide, silica, or hardened clay.

Breccia: Breccia is a rock formed from large angular pieces of minerals or rocks, held together by a fine-grained matrix.

Bauxite: Bauxite is a sedimentary rock with a high aluminum content, serving as the primary global source for aluminum and gallium. It comprises aluminum minerals such as gibbsite, boehmite, and diaspore, along with iron oxides, kaolinite clay, and traces of anatase and ilmenite. Bauxite is characterized by its dull luster and reddish-brown, white, or tan color.

Meteorite: A meteorite is a piece of debris from outer space that survives its journey through the atmosphere to land on a planet or moon's surface. When it enters the atmosphere, it heats up, becoming a meteor and creating a fireball known as a shooting star. The brightest ones are called bolides by astronomers. Once it lands, it becomes a meteorite, which can vary in size. Geologists define a bolide as a meteorite that creates an impact crater.

Sediment: Sediment is natural material that undergoes weathering and erosion, and is then moved by wind, water, or ice, or by gravity. It can be carried in rivers and deposited as sediment on the sea bed. Over time, buried sediment can become rocks like sandstone and siltstone through a process called lithification.

Clay: Clay is a fine-grained soil material containing clay minerals that develop plasticity when wet and harden when fired. While most clay minerals are white or light-colored, natural clays can exhibit various colors due to impurities like iron oxide.

Gravel: Gravel is a natural loose collection of rock fragments created by erosion and sedimentary processes. It is commonly found on Earth and also commercially produced as crushed stone.

Sand: Sand is a granular material made up of small mineral particles. It comes in different compositions but is characterized by its size, larger than silt but smaller than gravel. Sand can also refer to a type of soil consisting of over 85% sand-sized particles.

Sedimentary basin: A sedimentary basin is a large depression in the Earth's crust where sediments have accumulated, forming a three-dimensional body of sedimentary rock. These basins are created by subsidence over long periods of time, providing space for the accumulation of sediments. The sediments undergo compaction and lithification during burial, transforming into sedimentary rock.

Soil science: Soil science is the study of the Earth's surface soil as a natural resource, which includes examining the formation, classification, and mapping of soil. It encompasses the study of the physical, chemical, biological, and fertility properties of soils and their relation to soil use and management.

Soil: Soil, often called earth or dirt, is a complex mixture of organic matter, minerals, gases, liquids, and organisms. It provides essential support for plants and soil organisms, distinguishing it from displaced soil, known as dirt.

Peat: Peat is organic matter formed in wetland areas, like bogs or mires. It is made up of partially decayed vegetation, with sphagnum moss being a common component. The mosses' biological features aid in peat formation by creating a suitable habitat. Soils consisting mostly of peat are called histosols. Peat forms when stagnant water or flooding restrict oxygen, slowing decomposition. Peat can exhibit varying properties such as organic matter content and hydraulic conductivity.

Soil fertility: Soil fertility refers to the soil's capacity to sustain consistent and high-quality agricultural plant growth. It involves supplying necessary plant nutrients and water in appropriate quantities over a sustained period. A fertile soil must also be free from toxic substances that can hinder plant growth.

Soil formation: Soil formation, or pedogenesis, is the process by which soil is created and shaped by the environment and history. Biogeochemical processes create and disrupt order in soils, leading to the formation of distinct layers called soil horizons. These horizons vary in color, structure, texture, and chemistry. The distribution of soil types is determined by different factors that influence the formation of soil.

Pedosphere: The pedosphere is the outermost layer of the Earth, made of soil and shaped by soil formation processes. It acts as the interface between the lithosphere, atmosphere, hydrosphere, and biosphere. Serving as the Earth's skin, it forms when there is a dynamic interaction between these components. Ultimately, the pedosphere is crucial for supporting terrestrial life on our planet.

Stratigraphy: Stratigraphy is the study of rock layers and their arrangement. It is used mainly for sedimentary and volcanic rocks. This field includes three subfields: lithostratigraphy, biostratigraphy, and chronostratigraphy.

Stratigraphic unit: A stratigraphic unit is a identifiable volume of rock defined by its unique characteristics, such as petrographic, lithologic, or paleontologic features. It represents a relative age range and is easily recognizable and mappable.

Fold (geology): A fold in geology refers to the bending or curving of originally planar surfaces, like sedimentary strata, during permanent deformation. Folds can range in size from microscopic crinkles to mountain-sized structures, occurring either as isolated folds or in periodic sets. Some folds are formed during the deposition of sediments and are known as synsedimentary folds.

Fault (geology): A fault is a fracture in rock that has caused significant displacement due to rock-mass movements. Plate tectonic forces create large faults, some of which form the boundaries between plates. Earthquakes are mainly caused by rapid movement on active faults, while some faults displace slowly without causing seismic activity.

Thrust fault: A thrust fault is a fracture in the Earth's crust that causes older rocks to move above younger rocks.

Plate tectonics: Plate tectonics is a scientific theory stating that Earth's lithosphere consists of large moving plates. This concept developed from the idea of continental drift in the early 20th century and gained acceptance after the validation of seafloor spreading in the mid-to-late 1960s.

Continent: A continent is a large geographical region conventionally identified, which may be a single landmass or part of a larger one. The number of continents can vary, with seven commonly recognized: Asia, Africa, North America, South America, Antarctica, Europe, and Australia. Some variations merge these regions, such as combining North and South America into America or Africa, Asia, and Europe into Afro-Eurasia.

Continental shelf: A continental shelf is a submerged portion of a continent, covered by shallow water called a shelf sea. These shelves were exposed during glacial periods when sea levels dropped. The shelf surrounding an island is called an insular shelf.

Abyssal plain: An abyssal plain is a flat and smooth underwater plain on the deep ocean floor. It is typically found between the foot of a continental rise and a mid-ocean ridge, at depths of 3,000 to 6,000 meters. Covering over 50% of the Earth's surface, abyssal plains are important geological features of oceanic basins and are among the least explored regions on our planet.

Mid-ocean ridge: A mid-ocean ridge (MOR) is a seafloor mountain system resulting from plate tectonics. It typically reaches a height of 2,000 meters above the ocean basin's deepest point. Located at divergent plate boundaries, it is where seafloor spreading occurs. The rate of seafloor spreading determines the ridge's shape and width.

Oceanic trench: Oceanic trenches are narrow, long depressions on the ocean floor, typically 50 to 100 kilometers wide and 3 to 4 km deep. They can stretch for thousands of kilometers and there are about 50,000 km of trenches worldwide. The deepest point is in the Mariana Trench's Challenger Deep, reaching 10,920 m below sea level. These trenches are mainly found in the Pacific Ocean, with some in the eastern Indian Ocean and a few other regions.

Lithosphere: The lithosphere is the rigid outer shell of a planet or moon. On Earth, it consists of the crust and the top part of the upper mantle. It behaves elastically and is distinguished by its chemistry and mineralogy.

Crust (geology): The crust is the outer solid layer of rocky planets and satellites. It differs from the mantle in chemical composition and can also be distinguished by its phase in icy satellites.

Volcano: A volcano is a rupture in the Earth's crust, through which hot lava, ash, and gases escape from a magma chamber below the surface.

Geyser: A geyser is a spring that sporadically shoots out water and steam due to unique hydrogeological conditions found in a few locations on Earth. It is a rare phenomenon.

Hotspot (geology): Hotspots are volcanic areas fueled by abnormally hot mantle beneath the Earth's surface. They can be found independently of tectonic plate boundaries and are responsible for volcano chains as plates shift. Notable examples include Hawaii, Iceland, and Yellowstone.

Lava: Lava is molten rock expelled from a planet or moon's interior onto its surface. It can erupt from a volcano or through a crust fracture, both on land or underwater, at temperatures ranging from 800 to 1,200 °C. The cooled volcanic rock is also referred to as lava.

Geomorphology: Geomorphology is the study of how landforms are shaped by various processes. Geomorphologists examine landform history and predict changes using field observations, experiments, and modeling. They work in fields like geography, geology, archaeology, and engineering.

Erosion: Erosion is the process of removing and transporting soil, rock, or dissolved material from one place to another on Earth's crust. It is different from weathering as it involves movement. Physical erosion refers to the removal of rock or soil as sediment, while chemical erosion dissolves soil or rock. Eroded material can be transported over short distances or for long distances, ranging from millimeters to thousands of kilometers.

Avalanche: An avalanche is a fast-moving snow descent on a hill or mountain slope.

Landslide: Landslides, or landslips, refer to various types of ground movements like rockfalls, mudflows, and debris flows. They can happen in different environments, ranging from mountains to underwater areas. Landslides occur on steep or gentle slopes and can cause significant damage.

Weathering: Weathering is the natural decay of rocks, soils, and minerals caused by water, air, sunlight, and living organisms. It happens where these materials are found, unlike erosion which involves the movement of rocks and minerals by water, wind, and other forces.

Landform: A landform is a physical feature on the Earth's surface. It includes hills, mountains, canyons, valleys, and shoreline features like bays and peninsulas. Landforms form the landscape known as topography and can be natural or man-made. They also include submerged features such as mid-ocean ridges, volcanoes, and ocean basins.

Land: Land, also called dry land or ground, is the solid surface of Earth not covered by water. It represents 29.2% of the planet's surface and includes continents and islands. Covered mostly by regolith, a layer of rock, soil, and minerals, land influences Earth's climate through its involvement in the carbon, nitrogen, and water cycles. A third is forested, another third is used for agriculture, and a tenth is made up of permanent snow and glaciers. The rest comprises desert, savannah, and prairie.

Hill: A hill is an elevated landform with a distinct summit, extending above the surrounding terrain. It is commonly applied to peaks that are higher than the land around them but not as prominent as mountains.

Valley: A valley is a long, low area between hills or mountains, usually with a river or stream flowing through it. Valleys are predominantly formed by the erosion caused by rivers or streams over a long period, while some are the result of glacial ice erosion, often found in high mountains or polar regions.

Plateau: A plateau is a flat, raised area with steep sides, found in highlands. It can be formed by volcanic activity, lava flow, or water and glacier erosion. Plateaus are classified based on their surroundings as intermontane, piedmont, or continental. They can have small or wide flat tops.

Plain: A plain is a flat expanse of land, typically without trees, that remains relatively level in elevation. They can be found in valleys, at the base of mountains, along coastlines, and on plateaus. Plains are found on all continents, covering over one-third of the world's land area. They are significant for agriculture and support various types of biomes.

Impact crater: An impact crater is a circular depression on a solid object caused by the high-speed collision of a smaller object. Unlike volcanic craters, impact craters have elevated rims and lower floors. Lunar impact craters vary in size from tiny craters on lunar rocks to large, multi-ringed basins. Meteor Crater on Earth is a notable example of a small impact crater.

Aeolian processes: Aeolian processes refer to wind activity in geology and weather, shaping the Earth's surface through erosion, transport, and deposition of materials. They are significant in arid environments like deserts, where sparse vegetation, lack of soil moisture, and abundant loose sediments create ideal conditions for wind to shape the land. While water is a more powerful eroding force, aeolian processes play a crucial role in these dry regions.

Dune: A dune is a landform made of wind or water-driven sand, often in the shape of a mound or ridge. Areas with dunes are called dune systems or complexes, while larger ones are called dune fields. Flat regions covered with sand and little vegetation are known as ergs or sand seas. Dunes come in various shapes and sizes, with longer sides facing the wind and shorter slip faces on the opposite side. The space between dunes is called a dune slack.

Artificial island: An artificial island is a land constructed by humans rather than formed naturally. It can be created by expanding existing islets, constructing on reefs, or combining multiple islets. The size of artificial islands can vary, from small reclaimed areas for a single structure to entire communities. The concept is not new and dates back to the Neolithic era. Early artificial islands included floating structures or wooden/megalithic structures in shallow waters.

Land reclamation: Land reclamation, also known as reclamation or land fill, is the process of transforming underwater or wet areas like oceans, seas, riverbeds, or lake beds into usable land. This newly created land is referred to as reclamation ground, reclaimed land, or land fill.

Polder: A polder is a low-lying area enclosed by dikes that forms an artificial landmass. It can be created by reclaiming land from bodies of water, separating flood plains from rivers or seas, or draining marshes. In Germany, the term koogs is used interchangeably.

Cave: A cave or cavern is a natural void large enough for humans to enter, formed by the weathering of rock. It can include smaller openings like sea caves and rock shelters. Caves that extend deeper underground than their openings are called endogene caves.

Karst: Karst is a unique landscape shaped by the erosion of limestone, dolomite, and gypsum, resulting in sinkholes and underground caves. It includes features like poljes and drainage systems. Additionally, under suitable conditions, less susceptible rocks like quartzite can also be found.

Alluvial fan: An alluvial fan is a sediment accumulation that spreads out from its source, typically a narrow canyon. They are found in mountainous areas with dry or wet climates, ranging in size from less than 1 square kilometer to 20,000 square kilometers.

Canyon: A canyon is a deep cleft between cliffs resulting from the erosive activity of a river over time. It forms when a river cuts through layers of rock, wearing them away as sediments are carried downstream. Canyons occur when the river's starting point and endpoint have different elevations, especially in areas with both soft and hard rock layers.

Floodplain: A floodplain is a low-lying area next to a river that floods during high discharge. It extends from the river banks to the enclosing valley and is composed of soils like clay, silt, sand, and gravel deposited during floods.

Meander: A meander is a sinuous curve in a watercourse formed by erosion of its outer bank and deposition on its inner bank. This creates a winding channel that migrates across a floodplain due to sedimentation and erosion.

Rapids: Rapids are fast-flowing and turbulent sections of a river caused by a steep river bed gradient. Four factors required for rapids include strong water flow, a sharp incline, narrow passages, and obstacles.

Waterfall: A waterfall is when water flows over a vertical drop or steep drops in a river or stream. It can also happen when meltwater falls off the edge of a tabular iceberg or ice shelf.

Glacial landform: Glacial landforms are formations shaped by glaciers, predominantly during the Quaternary glaciations. Prominent occurrences exist in Fennoscandia and the southern Andes, while rare and ancient fossil glacial landforms are found in places like the Sahara.

Fjord: A fjord is a narrow sea inlet with steep sides, formed by a glacier. They are found in Antarctica, the Arctic, and northern/southern hemispheres. Norway has about 1,200 fjords, making its coastline around 29,000 km long.

Moraine: A moraine is debris carried by a glacier or ice sheet and found in glaciated areas. It can include particles of various sizes, from boulders to gravel and sand, mixed with fine clay called glacial flour. Lateral moraines form at the side of the ice flow, while terminal moraines mark the furthest extent of the glacier. Other types of moraines include ground and medial moraines.

Mountain: A mountain is a raised part of the Earth's crust with steep sides, often showing exposed bedrock. It is usually higher than a hill, rises at least 300 metres above surrounding land, and has a limited summit area. Mountains can be found either as isolated summits or within mountain ranges.

Mountain range: A mountain range is a series of mountains or hills connected by high ground. They are typically formed by plate tectonics and can be part of a mountain system with similar form, structure, and alignment. Mountain ranges are not exclusive to Earth and are likely present on most terrestrial planets in the Solar System.

Archipelago: An archipelago refers to a group of islands or a cluster of scattered islands in a sea. It can also be known as an island chain.

Bay: A bay is a coastal body of water connecting to a larger water body, like an ocean or lake. It can be large and called a gulf or a sea. A cove is a small circular bay with a narrow entrance. Fjords are elongated bays formed by glaciers. Embayment is used for related features like extinct bays or freshwater environments.

Beach: A beach is a landform consisting of loose particles, made from rocks or organic sources. The particles vary in density and structure due to wave action and weather, resulting in different textures, colors, and layers of material.

Coast: A coast is the area where land meets the ocean, forming a boundary between land and sea. It is influenced by the surrounding landscape and water-induced erosion. Coasts are important for ecosystems and biodiversity, including wetlands, saltmarshes, mangroves, and rocky shores. They also provide habitat for various aquatic species. Additionally, coral reefs can be found in certain coastal areas. The Earth has approximately 620,000 kilometers of coastline.

Lagoon: A lagoon is a shallow water body separated from a larger body of water by a narrow landform. It can be classified as a coastal or atoll lagoon and occurs on mixed-sand and gravel coastlines. There is an overlap between lagoons and estuaries. They are common coastal features worldwide.

Peninsula: A peninsula is a landform surrounded by water on most of its borders. It can also be defined as land bordered by water on three sides. Peninsulas exist on all continents and can vary in size. The Arabian Peninsula is the largest in the world. They form due to various causes.

Island: An island is a piece of land surrounded by water. Small islands are called islets, and those in rivers or lakes may be called eyots or aits. Other names for small islands off the coast include holms, cays, skerries, and keys. Sedimentary islands in the Ganges Delta are called chars. A collection of islands, such as the Philippines, is known as an archipelago.

Atoll: An atoll is a ring-shaped island with a coral rim enclosing a lagoon. It forms in warm tropical or subtropical waters where coral can grow. The Pacific Ocean is home to most of the world's 440 atolls, which may also include coral islands or cays.

Seamount: A seamount is a large underwater landform that does not reach the ocean surface, formed from extinct volcanoes. They rise abruptly from the seafloor, reaching heights of 1,000-4,000m. These conical features are found hundreds to thousands of meters below the surface, making them part of the deep sea. Some seamounts eventually erode to create flat surfaces called guyots or tablemounts.

Cliff: A cliff is a vertical or nearly vertical area of rock, formed by weathering and erosion, as a result of gravity. They are found in various locations including coasts, mountains, escarpments, and rivers. Cliffs are typically made of resistant rocks like sandstone, limestone, chalk, dolomite, granite, and basalt.

Mesa: A mesa is an isolated flat-topped hill with steep sides, standing prominently above a plain. It is formed by flat-lying sedimentary rocks topped by a more resistant layer, creating a caprock. This caprock can consist of sandstone, limestone, lava flows, or eroded duricrust. It is different from a plateau, as mesas specifically involve horizontal layers of bedrock, while flat-topped plateaus are called tablelands.

Cryosphere: The cryosphere refers to all areas on Earth's surface where water is frozen, such as sea ice, glaciers, and snow cover. It plays a crucial role in the global climate system and impacts various aspects like energy flux, precipitation, and oceanic circulation. It is closely related to the hydrosphere, contributing to the overall functioning of Earth's climate.

Flood: A flood is the overflow of water onto usually dry land. It can also refer to the incoming tide. Floods are studied in hydrology and are significant concerns for agriculture, civil engineering, and public health. Man-made environmental changes, like deforestation and removal of wetlands, increase the frequency and intensity of floods. Climate change exacerbates flooding through increased rainfall and extreme weather events, leading to more severe and frequent floods with higher risk.

Hydrosphere: The hydrosphere refers to all water found on, under, and above a planet's surface. Earth's hydrosphere is over 4 billion years old and constantly changing due to seafloor spreading and continental drift.

Oceanography: Oceanography, also known as oceanology, is the scientific study of the oceans. It covers various topics such as ecosystem dynamics, ocean currents, plate tectonics, and chemical substances within the ocean. Oceanographers utilize multiple disciplines such as astronomy, biology, chemistry, geography, geology, hydrology, meteorology, and physics to gain knowledge about the world ocean. Additionally, paleoceanography examines the past history of the oceans. This field encompasses the study of marine geology, physics, chemistry, and biology.

Coral reef: A coral reef is an underwater ecosystem made up of colonies of coral polyps joined by calcium carbonate. It is primarily formed from stony corals that gather in groups.

Coral reef fish: Coral reef fish thrive in coral reef ecosystems, exhibiting vibrant colors and diversity. They inhabit small areas within healthy reefs, displaying adaptations for survival and often remaining hidden or camouflaged.

Deep-sea fish: Deep-sea fish inhabit the dark depths below the sunlit surface waters of the ocean. The lanternfish is the most prevalent among them, with other notable species including flashlight fish, cookiecutter shark, bristlemouths, anglerfish, viperfish, and certain eelpout species.

Ocean: The ocean is a vast body of salt water covering around 70.8% of the Earth's surface. It is divided into five areas: Pacific, Atlantic, Indian, Antarctic/Southern, and Arctic. The ocean contains 97% of Earth's water and is crucial for life on our planet. It greatly influences climate, weather patterns, the carbon cycle, and acts as a massive heat reservoir.

Ocean current: An ocean current is a sustained, flowing movement of seawater caused by various factors such as wind, temperature and salinity differences, and the Coriolis effect. These currents are primarily horizontal and influenced by depth, shoreline, and interactions with other currents.

Thermohaline circulation: Thermohaline circulation (THC) is a global oceanic movement driven by temperature and salt content variations, which determine water density. Surface currents carry cool water from the equator to high latitudes where it sinks and flows into ocean basins. This circulation mixes waters between basins, making Earth's oceans a connected global system. THC plays a crucial role in transporting energy and mass worldwide, thus significantly impacting Earth's climate.

Sea: A sea is a large body of salty water. It can refer to specific seas or the ocean, which is a wider body of seawater. Specific seas can be marginal seas, sections of the ocean, or large, nearly landlocked bodies of water.

Seabed: The seabed refers to the ocean floor, encompassing the entirety of the ocean. It includes all the floors and is commonly known as 'seabeds.'

Sea level: Sea level is an average surface level of Earth's coastal bodies of water used as a reference for measuring elevation. It is a global vertical datum that serves as a standard for cartography, marine navigation, aviation, and atmospheric pressure measurements. A typical mean sea-level standard is the midpoint between a mean low and mean high tide at a specific location.

Tide: Tides are the result of gravitational forces between the Moon, Earth, and their orbital interaction, leading to the regular rise and fall of sea levels.

Tsunami: A tsunami is a series of waves caused by the displacement of a large volume of water, often by natural disasters like earthquakes or volcanic eruptions. Unlike regular ocean waves or tides, tsunamis result from significant water movement caused by major events.

Glacier: A glacier is a dense, moving body of ice that forms when snow accumulation exceeds melting over many years. It creates distinct features such as crevasses and moraines, as it flows and shapes the land. Glaciers only form on land and are different from sea ice and lake ice.

Iceberg: An iceberg is a large chunk of freshwater ice that has broken off from a glacier or ice shelf and is floating in saltwater. It poses a serious risk to maritime navigation. Only a small part of an iceberg is visible above the water, leading to the saying "tip of the iceberg" to represent a small visible portion of a larger unseen issue. Smaller pieces of floating ice are called "growlers" or "bergy bits".

Ice sheet: An ice sheet, or continental glacier, is a vast mass of glacial ice covering more than 50,000 km². The only existing ice sheets are the Antarctic ice sheet and the Greenland ice sheet. Ice sheets are larger than ice shelves or alpine glaciers. Smaller ice masses covering less than 50,000 km² are called ice caps, which typically feed surrounding glaciers.

Ice shelf: An ice shelf is a large floating platform of ice that forms where glaciers or ice sheets flow into the ocean. They are found in Antarctica and the Arctic, with thickness ranging from 100 to 1,000 meters. The grounding line separates the floating ice shelf from the anchor ice. The Ross and Filchner-Ronne Ice Shelves are the world's largest. Ice shelves breaking off can create icebergs, a process known as ice calving.

Permafrost: Permafrost is frozen soil or underwater sediment that stays below freezing for at least two years. It can be as old as 700,000 years and can reach depths greater than 1,500 meters. Permafrost can be found in narrow mountain summits or vast Arctic regions. It is usually located below a layer of soil that freezes and thaws with the seasons, excluding areas under glaciers and ice sheets.

Sea ice: Sea ice is frozen seawater that floats on the ocean's surface. It covers 7% of the Earth's surface and 12% of the world's oceans. It is mainly found in the polar ice packs of the Arctic and Antarctic regions. Sea ice undergoes yearly cycling and plays a crucial role in the Arctic ecosystem. It is highly dynamic and varies in types and features due to winds, currents, and temperature changes. Sea ice is distinct from icebergs, which are chunks of ice from glaciers or ice shelves. In some areas, sea ice expanses may include icebergs.

Hydrology: Hydrology is the science of studying water movement and management on Earth and other planets. It involves analyzing data to solve water-related issues such as environmental preservation, natural disasters, and water management. Hydrologists use various scientific techniques to collect and analyze data.

Groundwater: Groundwater is the water beneath Earth's surface in rock and soil pores. It accounts for 30% of accessible freshwater. Aquifers are rock or deposits that contain usable amounts of water. The water table is the depth at which pore spaces are saturated. Groundwater can be naturally discharged or form wetlands. It is extracted for human use and studied in hydrogeology.

Spring (hydrology): A spring is a natural point where groundwater emerges and becomes surface water. It is vital for humans, particularly in arid regions with low annual rainfall, as a source of fresh water. Springs are an important component of the water cycle and the hydrosphere.

Hydrography: Hydrography is the scientific study of oceans, seas, lakes, and rivers. It involves measuring and describing their physical features and predicting changes over time. The main goal is to ensure safe navigation and support various marine activities, including economic development, defense, research, and environmental protection.

Lake: A lake is a large body of water on the earth's surface, separate from the ocean. It is surrounded by land and serves as a storage for freshwater, forming part of the Earth's water cycle. While most lakes are freshwater and account for the majority of the world's surface freshwater, some are salt lakes with higher salinity than seawater. Lakes vary in size and volume.

Dry lake: A dry lake, or playa, is a basin that once had water but now dries up due to evaporation. If the lake bed has alkaline deposits, it becomes an alkali flat, and if it has salt deposits, it becomes a salt flat.

Pond: A pond is a small body of water formed by pooling inside a depression. It is smaller than a lake and can be naturally or artificially created. Ponds can have emergent vegetation and are categorized into four zones. They can vary in size and depth throughout the year and can be freshwater or brackish. Saltwater ponds connected to the sea are considered part of the marine environment and do not support fresh or brackish water-based organisms.

Limnology: Limnology is the study of inland water systems, encompassing their biological, chemical, physical, and geological properties. It investigates various natural and man-made bodies of water like lakes, rivers, wetlands, and groundwater. These water systems are classified as either running or standing.

River: A river is a natural freshwater stream that flows on the earth's land surface towards another larger body of water. It can also end by flowing into the ground or drying up. Small rivers have different names depending on the region. The term river doesn't have an official definition, and its size can vary.

Drainage basin: A drainage basin is an area where all surface water collects and flows to a single point or into another body of water. It is separated from adjacent basins by elevated features called the drainage divide. Basins can be made up of smaller basins that merge at river confluences, forming a hierarchical pattern.

Estuary: An estuary is a coastal body of brackish water, formed when rivers or streams flow into it and connect to the open sea. It serves as a transition zone between freshwater and marine environments, providing high levels of nutrients in both water and sediment. Estuaries are influenced by tides, waves, saline water, freshwater flows, and sediment, making them highly productive natural habitats.

River delta: A river delta is a triangular landform created when sediment carried by a river is deposited in slower-moving or stagnant water. It occurs at the river mouth, where it enters an ocean, sea, estuary, lake, reservoir, or another river unable to carry away the sediment. The delta resembles the Greek letter Δ. Its size and shape are determined by the balance between sediment supply and redistribution, sequestration, and export processes in the receiving basin. The receiving basin's size, geometry, and location also influence delta evolution.

Water cycle: The water cycle is the continuous movement of water on, above, and below the Earth's surface. It involves various processes like evaporation, condensation, precipitation, and runoff. The water can be found in different forms – liquid, solid, and vapor. The ocean is a major source of evaporation in the water cycle.

Physics: Physics is the study of matter, its motion, behavior, and the concepts of energy and force. It aims to comprehend the behavior of the universe. Physicists are the scientists who specialize in this field.

Energy: Energy is a fundamental property in physics that can be transferred to a system and is observed through work, heat, and light. It cannot be created or destroyed, only converted. The joule (J) is the unit used to measure energy in the SI system.

Conservation of energy: The conservation of energy states that the total energy in an isolated system remains constant over time. Energy can be transformed or transferred between different forms, but it cannot be created or destroyed. In a closed system, energy can only change through entering or leaving the system. An example is the conversion of chemical energy into kinetic energy during an explosion. Adding up all released forms of energy will equal the decrease in chemical energy during the explosion.

Matter: Matter refers to substances that have mass and occupy space. It consists of atoms and particles that possess both rest mass and volume. Matter encompasses solids, liquids, and gases like water. It does not include massless particles, energy phenomena, or waves such as light or heat. Additionally, matter can exist in other states like plasma, Bose–Einstein condensates, fermionic condensates, and quark–gluon plasma.

Vacuum: A vacuum is an empty space devoid of matter. It is derived from the Latin word vacuus, meaning "vacant" or "void". Physicists refer to a perfect vacuum as a space without any matter or pressure, while a partial vacuum is an imperfect vacuum with reduced pressure. In engineering and applied physics, vacuum refers to a space with lower pressure than the atmosphere. The term in vacuo is used to describe an object surrounded by a vacuum.

Gravity: Gravity is a fundamental interaction that causes attraction between objects with mass. It is the weakest of the four fundamental interactions and has no significant influence on subatomic particles. However, gravity plays a crucial role in determining the motion of macroscopic objects such as planets, stars, galaxies, and light.

Electromagnetism: Electromagnetism is a fundamental force in nature, involving interactions between charged particles through electromagnetic fields. It combines electrostatics and magnetism, resulting in attractive or repulsive forces between charged particles. This force dominates atomic and molecular interactions. Electromagnetism also creates electromagnetic fields that accelerate particles via the Lorentz force. At high energy, electromagnetism is unified with the weak force to form the electroweak force.

Strong interaction: The strong interaction, also known as the strong force or strong nuclear force, is a fundamental interaction in nuclear and particle physics. It confines quarks into hadron particles like protons and neutrons, and binds these particles to form atomic nuclei. It is essential for the stability and structure of matter.

Weak interaction: The weak interaction, a fundamental force in nuclear and particle physics, is responsible for radioactive decay and nuclear reactions. It is one of the four known fundamental interactions, along with electromagnetism, the strong interaction, and gravity. Its behavior is described by electroweak theory, also known as quantum flavor dynamics.

Spacetime: Spacetime is a mathematical model combining space and time into a four-dimensional continuum. It helps visualize relativistic effects, like how events appear to different observers.

Space: Space is a three-dimensional continuum of positions and directions that is crucial to understanding the physical universe. It is usually seen as a three-dimensional concept in classical physics, but modern physicists view it as part of a four-dimensional spacetime framework. Philosophical debate exists on whether space is an entity, a relationship between entities, or a conceptual framework.

Time: Time is the ongoing sequence of events that occurs in a forward direction from the past to the future. It is used to measure durations, intervals, and rates of change. Time is commonly considered a fourth dimension alongside three spatial dimensions.

Mass–energy equivalence: Mass-energy equivalence refers to the relationship between mass and energy in a system's rest frame, where they differ by a multiplicative constant. Albert Einstein's formula describes this principle. In a moving reference frame, the system's relativistic energy and relativistic mass follow the same formula.

Radiation: Radiation is the emission or transmission of energy through waves or particles. It can be categorized into electromagnetic radiation (e.g. radio waves, x-rays) and particle radiation (e.g. alpha and beta particles). Additionally, acoustic radiation includes ultrasound and seismic waves, while gravitational radiation refers to gravitational waves.

Ionizing radiation: Ionizing radiation is a form of energy that can detach electrons from atoms or molecules. It includes subatomic particles and high-energy electromagnetic waves. Some particles can travel close to the speed of light.

Field (physics): In physics, a field is a physical quantity that has a value for each point in space and time. It can be represented as a scalar, vector, or tensor. Field theories are used to describe how the values of fields change in space and time. Examples include temperature and wind speed maps, which are scalar and vector fields respectively. The electric field is another example of a field, which can be described as a rank-1 tensor field. Electrodynamics involves the interaction of two vector fields or a single rank-2 tensor field. Fields are fundamental in understanding the dynamics of physical phenomena.

Flux: Flux refers to the passage or movement of something through a surface or substance. In applied mathematics and vector calculus, flux has various applications in physics. It can be a vector quantity representing the flow's magnitude and direction in transport phenomena. In vector calculus, it is a scalar quantity obtained by integrating the perpendicular component of a vector field over a surface.

Gauge theory: Gauge theory is a type of field theory in physics. It involves a Lagrangian that remains unchanged under certain local transformations, meaning the dynamics of the system remain consistent. The Lagrangian is invariant.

Symmetry (physics): Symmetry in physics refers to a feature of a physical system that remains unaltered under certain transformations. This preservation could be either physical or mathematical in nature.

Theoretical physics: Theoretical physics is a field of physics that uses mathematics and abstractions to understand, clarify, and forecast natural phenomena. It differs from experimental physics, which relies on experiments to investigate these phenomena.

Speed of light: The speed of light (c) is a universal physical constant of 299,792,458 m/s in vacuum. In line with the special theory of relativity, it serves as the maximum speed at which conventional matter or energy can move through space.

Atom: An atom is the basic particle of the chemical elements, composed of a nucleus with protons and often neutrons, surrounded by electrons. The number of protons in an atom determines its identity as a particular element. Atoms with the same number of protons but different numbers of neutrons are called isotopes.

Atomic physics: Atomic physics is a branch of physics that investigates the structure of atoms, particularly the arrangement of electrons around the nucleus, and the processes that cause this arrangement to change. It explores the interaction between atoms and includes the study of ions and neutral atoms.

Atomic theory: Atomic theory is the scientific belief that matter is made up of tiny particles called atoms. It gained credibility in the 18th and 19th centuries as it explained gas behavior and chemical reactions. By the late 19th century, atomic theory was widely accepted by the scientific community.

Atomic nucleus: The atomic nucleus is a small, dense region at the center of an atom, composed of protons and neutrons. It was discovered in 1911 and further understood after the discovery of the neutron in 1932. The nucleus carries most of the atom's mass and is bound together by the nuclear force. It is surrounded by negatively charged electrons held together by electrostatic force.

Isotope: Isotopes are different versions of the same element with the same atomic number but different numbers of neutrons. They share similar chemical properties but have different atomic masses and physical properties.

Nuclide: A nuclide refers to atoms distinguished by their proton and neutron count, denoted as Z and N respectively. It also includes their nuclear energy state.

Atomic orbital: An atomic orbital is a mathematical function that describes the location and wave-like behavior of an electron in an atom. It can be used to calculate the probability of finding the electron in different regions around the atom's nucleus. The term may also refer to the physical space where the electron is predicted to be present based on the orbital's mathematical form.

Binding energy: Binding energy is the minimum energy needed to separate particles or dismantle a particle system. It is primarily used in condensed matter physics, atomic physics, and chemistry, while nuclear physics refers to it as separation energy.

Bohr model: The Bohr model, proposed by Niels Bohr and Ernest Rutherford in 1913, is an atomic model that depicts a dense nucleus orbited by electrons, similar to the Solar System. The model emphasizes the quantized energy levels of electrons and the electrostatic force as the binding force, instead of gravity.

Electron configuration: Electron configuration is the arrangement of electrons in an atom's orbitals. It determines an atom's chemical properties. For instance, neon's electron configuration is 1s2 2s2 2p6, showing the occupation of specific subshells.

Electron shell: An electron shell is an orbit followed by electrons around an atom's nucleus. They are labeled numerically or alphabetically, representing principal quantum numbers or X-ray notation. Each row on the periodic table signifies an electron shell.

Ion: An ion is an atom or molecule that carries an electrical charge. In an ion, the number of electrons is not equal to the number of protons, causing a net charge. Protons are considered positive, while electrons are considered negative.

Energy level: Energy levels are specific values of energy that a bound quantum system or particle can have. This is in contrast to classical particles that can have any amount of energy. Energy levels are commonly used to describe the electrons in atoms, ions, or molecules, but can also refer to nuclei or vibrational and rotational energy in molecules. The discrete energy levels in a system lead to a quantized energy spectrum.

Geiger–Marsden experiments: The Geiger–Marsden experiments were conducted between 1908 and 1913 by Hans Geiger and Ernest Marsden under the supervision of Ernest Rutherford at the University of Manchester. These experiments revealed that every atom has a concentrated nucleus housing most of its mass and positive charge. Scientists made this discovery by observing the scattering of alpha particles when they struck a thin metal foil.

Molecular orbital: A molecular orbital is a mathematical function that describes the location and wave-like behavior of an electron in a molecule. It helps calculate properties like the probability of finding an electron in a specific region. Atomic and molecular orbitals were introduced in 1932 to represent one-electron wave functions. They describe the region in space where a function has a significant amplitude.

Molecular orbital theory: Molecular orbital theory is a quantum mechanics approach to understand the electronic structure of molecules. It was proposed in the early 20th century.

Optics: Optics is the study of light and its interaction with matter. It encompasses visible, ultraviolet, and infrared light, as well as other forms of electromagnetic radiation like X-rays and microwaves. This field also investigates the construction of devices that utilize or detect light.

Focus (optics): A focus, or image point, in optics refers to the convergence of light rays originating from an object. It is not a precise point but has a blur circle due to imperfections in the imaging optics called aberrations. The smallest possible blur circle is known as the Airy disc, resulting from diffraction caused by the aperture of the optical system. Aberrations worsen with larger aperture diameters, while the Airy circle is smallest for larger apertures.

Focal length: The focal length measures how light converges or diverges in an optical system. A positive focal length shows convergence, while a negative focal length indicates divergence. A shorter focal length bends light more sharply, bringing it to a focus quicker. In the case of a thin lens in air, a positive focal length is the distance for collimated rays to focus, while a negative focal length shows where a point source must be located to form a collimated beam. For general optical systems, the focal length is the inverse of the system's optical power.

Polarization (waves): Polarization is a property of transverse waves that describes the orientation of their oscillations. Unlike longitudinal waves, transverse waves exhibit polarization. Examples of polarized waves include light, radio waves, and transverse sound waves in solids. The direction of oscillation can be vertical, horizontal, or any angle perpendicular to the wave's motion. Longitudinal waves, like sound in liquids or gases, do not show polarization. Gravitational waves also exhibit polarization.

Reflection (physics): Reflection (physics) refers to the redirecting of a wavefront at the boundary between two mediums, causing it to return to its origin. This phenomenon is observed in light, sound, and water waves. According to the law of reflection, the angle of incidence on the surface equals the angle of reflection for specular reflection.

Refraction: Refraction is the redirection of a wave as it moves between different mediums, caused by changes in speed or medium. It is most commonly observed with light, but also occurs with sound and water waves. The extent of refraction depends on the change in wave speed and the initial direction of propagation relative to the speed change.

Refractive index: The term 'Refractive index' refers to a dimensionless number in optics that indicates the light bending ability of an optical medium.

Transparency and translucency: Transparency refers to the property of allowing light to pass through a material without scattering. It follows Snell's law and has a uniform index of refraction, appearing clear with a single color or a spectrum of colors. Translucency also allows light to pass through but can scatter it at interfaces or internally due to different indices of refraction. Opacity is the opposite of translucency. These properties, along with regular and diffuse reflection and transmission of light, are categorized as aspects of visual appearance under the concept of cesia.

Color: Color or colour is the perception of light based on the electromagnetic spectrum. It is not an inherent property of matter, but rather linked to an object's light absorption, reflection, emission, and interference. Humans perceive colors in the visible light spectrum using three types of cone cells. However, other animals may have different numbers and types of cone cells, allowing them to perceive different wavelengths, like bees distinguishing ultraviolet. Animal color perception is determined by the brain's processing of light wavelengths detected by their cone cell types.

CMYK color model: The CMYK color model is used in color printing and process, referring to the four ink plates: cyan, magenta, yellow, and key (black). It is a subtractive model derived from the CMY color model.

Color theory: Color theory is a practical guide for mixing colors and understanding their visual effects. It dates back to ancient times, with Aristotle and Claudius Ptolemy exploring color mixing. Al-Kindi and Ibn al-Haytham delved into the influence of light on color. Ibn Sina, Nasir al-Din al-Tusi, and Robert Grosseteste discovered multiple paths to create different colors. Modern approaches can be seen in the works of Alberti and da Vinci. The formalization of color theory began in the 18th century, with debates over Newton's theory of color. It has evolved as an independent artistic tradition, with limited reference to colorimetry and vision science.

Primary color: Primary colors are colorants or colored lights that can be mixed to create a wide range of colors. They are used in electronic displays, color printing, and paintings. The perception of colors can be predicted using a mixing model based on how light interacts with physical media and the retina.

Gloss (optics): Gloss in optics refers to how well a surface reflects light in a mirror-like direction. It is an important parameter for describing the visual appearance of an object. Gloss is part of a larger concept called cesia, which encompasses various aspects of visual appearance. Factors affecting gloss include material refractive index, angle of incident light, and surface topography.

RGB color model: The RGB color model combines red, green, and blue light to create a wide range of colors. Its name is derived from the initials of these primary colors.

Black: Black is an achromatic color that occurs when visible light is completely absorbed. Often used symbolically to represent darkness, it has been associated with oppositions like good and evil, as well as night and day. Since the Middle Ages, black has been a symbolic color of seriousness and power, commonly worn by judges and magistrates.

Blue: Blue is a primary color in both the RYB and RGB color models. It falls between violet and cyan on the visible light spectrum. It describes colors perceived by humans with wavelengths between approximately 450 and 495 nanometers. Blues often contain some green or violet. The daytime sky and deep sea appear blue due to Rayleigh scattering, while blue eyes are explained by the Tyndall effect. Distant objects appear bluer due to aerial perspective.

Brown: Brown is a composite color and a darker shade of orange. It is created by combining orange and black in the CMYK color model, and red and green in the RGB color model.

Green: Green is a color between cyan and yellow, with a wavelength of 495-570 nm. It is created by combining yellow and cyan in subtractive color systems and is one of the additive primary colors in the RGB model. Its main natural source is chlorophyll, aiding photosynthesis in plants. Many creatures camouflage themselves in green environments. Green minerals, such as emerald, contain chromium and exhibit this color.

Grey: Grey or gray is an intermediate, neutral color between black and white, composed of both colors. It represents cloud-covered skies, ash, and lead.

Orange (colour): Orange is a color that lies between yellow and red on the light spectrum. It appears when our eyes perceive light with a wavelength of around 585 to 620 nanometers. In color theory, it is created by mixing yellow and red pigments, while in the RGB model, it is considered a tertiary color. Its name is derived from the fruit called orange.

Pink: Pink is a pale tint of red, originally named in the late 17th century. It is associated with charm, sensitivity, femininity, and romance. Pink and white symbolize innocence, while pink and black represent eroticism. In modern times, pink is a symbol of femininity, but in the 1920s, it was considered masculine.

Purple: Purple is a color resembling violet light. It is a secondary color made by combining red and blue pigments. The CMYK color model for printing uses magenta pigment with cyan or black to create purple. On computer and TV screens, purple is achieved by mixing red and blue light to create violet-like hues.

Red: Red is a primary color in RGB and a secondary color in CMYK. It has a wavelength of 625-740 nm and is opposite violet. Red can vary from yellowish scarlet to bluish-red crimson and shades from pale red to dark burgundy.

White: White is the lightest color, opposite of black. It is the color of snow, chalk, and milk. White objects reflect and scatter all visible light. On screens, it is made by mixing red, blue, and green light. White is created with titanium dioxide pigments.

Yellow: Yellow is a color found between green and orange, with a dominant wavelength of 575-585 nm. It is used in painting and color printing as a primary color. In the RGB color model, yellow is a secondary color made by combining red and green. Carotenoids give yellow hues to various items like autumn leaves, corn, canaries, and lemons. They provide protection to plants and absorb light energy. Sunlight appears slightly yellow near the horizon due to atmospheric scattering.

Condensed matter physics: Condensed matter physics studies the physical properties of matter, particularly in solid and liquid phases, by examining electromagnetic forces between atoms and electrons. It explores condensed phases with strong interactions, including superconducting, ferromagnetic, antiferromagnetic, and Bose–Einstein condensate phases. Scientists use experiments and mathematical models based on quantum mechanics, electromagnetism, and statistical mechanics to understand these phases and predict the behavior of large groups of atoms.

Solid-state physics: Solid-state physics is the study of solids using methods like quantum mechanics and crystallography. It explores how the atomic-scale properties of solid materials determine their larger-scale properties. It is the largest branch of condensed matter physics and forms the theoretical basis of materials science. It has practical applications in the technology of transistors and semiconductors.

Crystallography: Crystallography is the study of how atoms are arranged in crystalline solids. It is a crucial field in materials science and solid-state physics. The term comes from Greek words meaning "crystal" and "writing". In 2012, the United Nations designated 2014 as the International Year of Crystallography, acknowledging its importance.

Crystal: A crystal is a solid material with a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. It is identifiable by its geometrical shape with specific orientations. Crystallography is the scientific study of crystals and their formation process is called crystallization or solidification.

Crystallization: Crystallization is a process where atoms or molecules arrange into a crystal structure. It occurs through methods like solution precipitation, freezing, or direct gas deposition. The resulting crystal's attributes depend on factors like temperature, air pressure, and evaporation time for liquid crystals.

State of matter: States of matter are distinct forms in which matter can exist. The four observable states in everyday life are solid, liquid, gas, and plasma. Other intermediate and exotic states, like liquid crystal and Bose-Einstein condensates, exist under extreme conditions. Neutron-degenerate matter and quark-gluon plasma are also examples of unique states. For more details, refer to the Wikipedia article List of states of matter.

Solid: A solid is a fundamental state of matter, along with liquid, gas, and plasma. It is characterized by closely-packed molecules with low kinetic energy, resulting in structural rigidity and resistance to external forces. Unlike liquids or gases, solids maintain their shape and do not fill the entire available volume. The atoms in a solid are tightly bound in a regular or irregular lattice formation. Solids cannot be compressed easily, in contrast to gases, which have loosely-packed molecules.

Amorphous solid: An amorphous solid lacks the long-range order seen in crystals. It is sometimes referred to as glass or glassy solid, especially when it undergoes a glass transition. Examples include glasses, metallic glasses, plastics, and polymers.

Liquid: A liquid is a fluid that takes the shape of its container and maintains a constant volume. It is one of the four fundamental states of matter, possessing definite volume but no fixed shape.

Gas: Gas is a fundamental state of matter, alongside solids, liquids, and plasmas.

Vapor: Vapor refers to a substance in gas phase below its critical temperature. It can condense to a liquid with increased pressure, without reducing its temperature. Unlike aerosols, vapor does not contain suspended particles of liquid or solid within a gas.

Plasma (physics): Plasma is a fundamental state of matter abundant in the universe, consisting of charged particles like ions and electrons. It is prevalent in stars, as well as in the rarefied intracluster and intergalactic mediums. It can be produced artificially through heating or subjecting a neutral gas to an electromagnetic field.

Degenerate matter: Degenerate matter, occurring at low temperatures, arises when the Pauli exclusion principle profoundly affects the state of matter. It is observed in dense celestial objects like white dwarfs and neutron stars, where gravitational collapse cannot be averted through thermal pressure alone. Furthermore, this concept is applicable to metals in the Fermi gas approximation.

Bose–Einstein condensate: A Bose–Einstein condensate (BEC) is a state of matter formed when a gas of bosons is cooled to very low temperatures. At this state, a significant number of bosons occupy the lowest quantum state, resulting in macroscopic quantum effects like wavefunction interference. This condensation phenomenon is also observed in superconductors, where Cooper pairs form a condensate, indicating a phase transition.

Phase transition: A phase transition is the process of transitioning between different states of matter, such as solid, liquid, gas, and sometimes plasma. It occurs when external conditions like temperature or pressure change, causing certain properties of the substance to also change. These transitions can be abrupt and are defined by specific conditions.

Phase (matter): In physical sciences, a phase refers to a chemically uniform and physically distinct region of material that can be mechanically separated. Each phase in a system has its own unique properties. For example, in a glass jar containing ice, water, and humid air, the ice cubes, water, and air are distinct phases. The glass jar itself is also considered a separate phase.

Phase diagram: A phase diagram is a chart showing conditions where different phases exist together in equilibrium. It is used in physical chemistry, engineering, mineralogy, and materials science to understand thermodynamic distinctions and coexistence of phases.

Boiling: Boiling is the rapid transition of a liquid into gas or vapor, caused by heating it to its boiling point. It happens when the vapor pressure of the liquid equals the surrounding atmospheric pressure. This process is the opposite of condensation and is one of the main ways that liquids evaporate.

Melting: Melting, or fusion, is a process where a solid substance transitions to a liquid state due to increased internal energy from heat or pressure. This occurs at the substance's melting point, disrupting the solid's structured arrangement and resulting in a less ordered liquid state.

Freezing: Freezing is the process in which a liquid transforms into a solid when cooled below its freezing point. It refers to the solidification phase change of a liquid or its content due to cooling.

Evaporation: Evaporation is a process where a liquid changes into a gas on its surface. It is affected by surrounding gas concentration and humidity. Energy transfer between liquid molecules causes them to escape into the air as a gas. Evaporation also cools the liquid by removing its energy.

Condensation: Condensation is the transformation from gas to liquid, which is the opposite of vaporization. It primarily pertains to the water cycle and occurs when water vapor comes into contact with a liquid, solid surface, or cloud condensation nuclei. When the conversion directly happens from gas to solid, it is known as deposition.

Ionization: Ionization is the process of atoms or molecules gaining or losing electrons to acquire a positive or negative charge. It can occur through various means, such as collisions with particles or electromagnetic radiation. This results in the formation of ions, which can also be created through reactions or radioactive decay.

Sublimation (phase transition): Sublimation is a phase transition where a substance goes from solid to gas without becoming a liquid. The reverse process is called deposition. The verb form is sublime, and the product obtained is called sublimate.

Critical point (thermodynamics): A critical point in thermodynamics is the endpoint of a phase equilibrium curve, such as the liquid-vapor critical point. This point signifies the conditions under which a liquid and its vapor can coexist. At the critical point, phase boundaries disappear due to a specific critical temperature and pressure. Other examples of critical points include those in mixtures and transitions between ferromagnetism and paramagnetism without an external magnetic field.

Triple point: The triple point is the temperature and pressure at which a substance's three phases coexist in equilibrium. It represents the meeting point of sublimation, fusion, and vaporization curves. For mercury, the triple point is at -38.8°C and a pressure of 0.165 mPa.

Electricity: Electricity is the physical phenomenon linked to the presence and movement of charged matter. It is closely connected to magnetism and falls under the umbrella of electromagnetism. Notable examples of electricity include lightning, static electricity, and electric heating.

Magnetism: Summary: Magnetism refers to the physical properties related to a magnetic field, enabling objects to attract or repel each other. It is a fundamental aspect of electromagnetism, arising from the magnetic fields generated by both electric currents and magnetic moments of elementary particles.

Magnet: A magnet is a material that creates an invisible magnetic field, which exerts a force on other ferromagnetic materials, attracting or repelling them, including iron, steel, nickel, and cobalt.

Electromagnet: An electromagnet is a magnet created by an electric current. It is made of wire wound into a coil, and the magnetic field is concentrated in the center of the coil. When the current is turned off, the magnetic field disappears. Electromagnets can be enhanced by using a magnetic core made of iron or other materials to increase their strength.

Dipole: A dipole is an electromagnetic phenomenon that involves the separation of positive and negative charges. It can occur in two ways: electric dipole deals with the separation of charges, while magnetic dipole involves the circulation of an electric current. Examples include a pair of charges and a loop of wire with constant current. A bar magnet is an example of a magnet with a permanent magnetic dipole moment.

Metamaterial: Metamaterials are engineered materials that possess unique properties not found in natural materials. They consist of composite elements made from metals and plastics, arranged in repeating patterns at a small scale. Unlike traditional materials, metamaterials derive their properties from their specific structures, allowing them to manipulate electromagnetic waves. By blocking, absorbing, enhancing, or bending waves, they offer advantages beyond what conventional materials can achieve.

Oil drop experiment: The oil drop experiment, conducted in 1909 by Robert A. Millikan and Harvey Fletcher, determined the elementary electric charge. This groundbreaking experiment was carried out at the Ryerson Physical Laboratory, University of Chicago, and earned Millikan the Nobel Prize in Physics in 1923.

Photoelectric effect: The photoelectric effect is the release of electrons when light hits a material, forming photoelectrons. It is studied in condensed matter physics, quantum chemistry, and solid state to understand the properties of atoms, molecules, and solids. This effect is employed in electronic devices for light detection and controlled electron emission.

Electrostatics: Electrostatics is the study of stationary or slow-moving electric charges.

Coulomb's law: Coulomb's law is an experimental physics law that calculates the force between two stationary charged particles. It was published by physicist Charles-Augustin de Coulomb in 1785 and is fundamental to the theory of electromagnetism. This law, also known as the inverse-square law, allows for discussions on the amount of electric charge in a particle.

Electric charge: Electric charge is a fundamental property of matter that generates forces in the presence of electromagnetic fields. It comes in two types: positive and negative. Like charges repel, unlike charges attract. Objects with no net charge are called electrically neutral. This knowledge is known as classical electrodynamics, accurately explaining interactions between charged substances.

Electric field: An electric field is a physical field created by charged particles that exerts attractive or repulsive forces on other charged objects. These forces are described by Coulomb's Law, with greater charges resulting in stronger forces. Electric fields originate from charges and time-varying electric currents, and are part of the electromagnetic field, one of the four fundamental forces of nature.

Electric potential: Electric potential is the work energy required to move a small charge from a reference point to a specific point in an electrical field. It represents the energy per unit charge for a negligible disturbance in the field. The motion should proceed without acceleration or radiation, and the electric potential at the reference point is zero. Earth or any point can serve as the reference point.

Dielectric: A dielectric is an insulating material that can be polarized by an electric field. Unlike conductors, it does not allow the flow of charges but instead causes a slight shift in the positions of charges, resulting in polarization. This polarization creates an internal electric field that reduces the overall field within the dielectric.

Magnetostatics: Magnetostatics is the study of steady magnetic fields in systems. It is equivalent to electrostatics, but for stationary charges. The equations of magnetostatics can even predict fast magnetic switching events. It is widely used in micromagnetics applications, such as modeling magnetic storage devices in computer memory.

Magnetic field: A magnetic field is a vector field that influences moving electric charges, electric currents, and magnetic materials. It causes a force on a moving charge and attracts or repels magnets and ferromagnetic materials. It also exerts small forces on nonmagnetic materials through paramagnetism, diamagnetism, and antiferromagnetism. Magnetic fields are present around magnetized materials, electric currents, and varying electric fields. They are mathematically described as a vector field assigning a vector to each point in space.

Ferromagnetism: Ferromagnetism is a property of certain materials that allows them to form permanent magnets due to their significant magnetic permeability and coercivity. These materials are noticeably attracted to magnets and can induce temporary magnetization when exposed to an external magnetic field. The acquisition of permanent magnetization by a material depends on the strength of the applied field and the coercivity of the ferromagnetic material.

Maxwell's equations: Maxwell's equations, or Maxwell-Heaviside equations, are a set of mathematical equations that describe the behavior of electric and magnetic fields. They form the basis of classical electromagnetism, optics, and electric circuits. These equations provide a model for various technologies like power generation, wireless communication, radar, and more. They explain how charges, currents, and changes in fields generate electric and magnetic fields. They were named after James Clerk Maxwell, who first proposed that light is an electromagnetic phenomenon and Oliver Heaviside, who contributed to their modern formulation.

Lorentz force: The Lorentz force is the resultant force experienced by a charged particle moving in an electric and magnetic field. It encompasses the combined effect of electromagnetic forces on the particle's motion.

Electromagnetic field: An electromagnetic field represents the effects of electric charges. It consists of an electric field and a magnetic field. Maxwell's equations explain how charges and currents interact with the field, while the Lorentz force law describes the forces experienced by charges in electric and magnetic fields. Changes in the fields influence each other. Disturbances in the electric field create disturbances in the magnetic field, resulting in the propagation of electromagnetic waves through space.

Electric current: An electric current is the flow of charged particles, like electrons or ions, through an electrical conductor. It represents the net rate of electric charge movement across a surface. The type of charge carriers depends on the conductor, such as electrons in wires, electrons or holes in semiconductors, ions in electrolytes, and ions and electrons in plasma.

Alternating current: Alternating current (AC) is an electric current that changes direction and magnitude continuously over time. It is the primary form of electrical energy used in businesses and homes, powering appliances and devices when plugged into a wall socket. AC is distinguished from direct current (DC) which flows in a single direction, and the abbreviations AC and DC are commonly used to refer to these currents.

Direct current: Direct current (DC) refers to the one-directional flow of electric charge. It can flow through various materials like conductors, semiconductors, and insulators, or even through a vacuum. DC is distinct from alternating current (AC), as it flows in a constant direction, and was previously known as galvanic current. Examples of DC power sources include electrochemical cells.

Electromagnetic induction: Electromagnetic induction is the creation of emf in a conductor due to a changing magnetic field.

Electromotive force: Electromotive force (emf) is the energy transferred to an electric circuit per unit of charge, measured in volts. It is provided by electrical transducers and devices like batteries and generators that convert different forms of energy into electrical energy. Emf is not a physical force, and the term has been deprecated in favor of source voltage or source tension.

Eddy current: An eddy current is an electric current induced in a conductor by a changing magnetic field or the movement of a conductor in a magnetic field. It flows in closed loops perpendicular to the magnetic field. Eddy currents can be generated in nearby conductors by AC electromagnets or transformers. The current's magnitude depends on the magnetic field strength, loop area, flux change rate, and material resistivity. They create circular patterns in metal resembling eddies or whirlpools in a liquid.

Electromagnetic radiation: Electromagnetic radiation (EMR) is the propagation of waves in the electromagnetic field, carrying both momentum and electromagnetic radiant energy. It encompasses various types such as radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays, forming the electromagnetic spectrum.

Electromagnetic spectrum: The electromagnetic spectrum refers to the entire range of different types of electromagnetic radiation. It is divided into several bands, each named after the waves within them based on their frequency. These include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. The waves in each band have unique characteristics, production methods, interactions with matter, and practical applications.

Radio wave: Radio waves are a type of electromagnetic radiation with long wavelengths, ranging from 1mm at 300 GHz to over 10,000 kilometers at 30 Hz. They travel at the speed of light and are generated by charged particles undergoing acceleration. Lightning, astronomical objects, and warm objects emit natural radio waves.

Microwave: Microwaves are a type of electromagnetic radiation with wavelengths ranging from 30 cm to 1 mm. They have frequencies between 1 GHz and 300 GHz and are commonly defined as the range between 1 and 100 GHz. Microwaves include the entire SHF band and are often referred to by radar band designations such as S, C, X, Ku, K, or Ka band.

Infrared: Infrared refers to electromagnetic radiation between microwaves and visible light that is invisible to the human eye. It covers wavelengths from approximately 750 nm to 1000 μm.

Visible spectrum: The visible spectrum refers to the range of electromagnetic radiation that can be seen by the human eye, commonly known as visible light. It may also include ultraviolet and infrared radiation, depending on the definition used.

Light: Light is electromagnetic radiation detected by the human eye. It falls within the 400–700 nm wavelength range, equivalent to frequencies of 750–420 THz. It encompasses the visible spectrum between infrared and ultraviolet.

Ultraviolet: Ultraviolet (UV) is a type of electromagnetic radiation that falls between visible light and X-rays. It makes up about 10% of the Sun's radiation and can also be produced by electric arcs, Cherenkov radiation, and certain light sources like mercury-vapor lamps and tanning lamps.

X-ray: X-ray is a powerful form of electromagnetic radiation, also known as Röntgen radiation, named after its discoverer Wilhelm Conrad Röntgen. It was identified in 1895 and is called X-radiation due to its mysterious nature.

Gamma ray: Gamma rays are a type of electromagnetic radiation that comes from the decay of atomic nuclei. They have the shortest wavelength and highest energy among electromagnetic waves. French chemist Paul Villard discovered gamma radiation in 1900, and they were named by Ernest Rutherford due to their strong ability to penetrate matter.

Bremsstrahlung: Bremsstrahlung is electromagnetic radiation emitted by a charged particle when it slows down due to interaction with another charged particle. This energy loss is converted into radiation, following the conservation of energy. The process produces a continuous spectrum of radiation, with higher frequencies increasing as the deceleration energy rises.

Fluorescence: Fluorescence is the emission of light by a substance that has absorbed light or electromagnetic radiation. It is a type of luminescence where the emitted light has a longer wavelength and lower energy than the absorbed radiation. This phenomenon is observable when a substance exposed to ultraviolet radiation emits visible light, giving it a distinct color. Unlike phosphorescence, fluorescence ceases quickly after the radiation source is removed.

Electrical network: An electrical network is a connection of electrical components, forming a model of interconnection. It can be represented by electrical elements. Not all networks are circuits, although all circuits are networks. Linear electrical networks only consist of sources, lumped elements, and distributed elements. These networks allow for linear superimposition of signals and can be analyzed using Laplace transforms to determine DC, AC, and transient responses.

Electrical impedance: Electrical impedance refers to the total resistance and reactance that opposes the flow of alternating current in a circuit. It is a vital concept in electrical engineering.

Electrical resistance and conductance: Electrical resistance is the measure of opposition to electric current, while conductance measures the ease of current flow. Resistance is similar to mechanical friction. The units for resistance and conductance are ohm and siemens, respectively.

Ohm's law: Ohm's law is a fundamental principle in physics that relates the electric current flowing through a conductor to the voltage across it. It states that the current is directly proportional to the voltage, with resistance as the constant of proportionality. This law is described by three mathematical equations.

Semiconductor: A semiconductor is a material with electrical conductivity between a conductor and an insulator. Its resistivity decreases as temperature rises. Impurities can be introduced to alter its conducting properties. Semiconductors form junctions, which are the basis for diodes, transistors, and modern electronics. Common examples include silicon and germanium. Gallium arsenide is the second-most common semiconductor, used in lasers, solar cells, and integrated circuits. Silicon plays a crucial role in electronic circuit fabrication.

Superconductivity: Superconductivity is a phenomenon in specific materials where electrical resistance disappears and magnetic fields are repelled. These materials, known as superconductors, have a critical temperature below which their resistance abruptly drops to zero. They can maintain an electric current indefinitely without the need for a power source.

Capacitance: Capacitance refers to an object or device's ability to store electric charge, measured by its response to a difference in electric potential. It has two main forms: self capacitance, which measures potential between an object and ground, and mutual capacitance, which measures potential between two components. Mutual capacitance is crucial in capacitors, electronic components that add capacitance to circuits.

Gain (electronics): Gain in electronics refers to the ability of a two-port circuit to amplify a signal by adding energy from a power supply. It is measured as the ratio of signal power at the output to the input, often expressed in dB. Active components or circuits have a gain greater than one, while passive circuits have a gain less than one.

Inductance: Inductance is the property of an electrical conductor that resists changes in the electric current flowing through it. It is caused by the production of a magnetic field around the conductor, which depends on the current's magnitude. According to Faraday's law of induction, any change in magnetic field induces an electromotive force (EMF) in the circuit, known as electromagnetic induction. This induced voltage, called back EMF, opposes the change in current, as stated by Lenz's law.

Kirchhoff's circuit laws: Kirchhoff's circuit laws, established by Gustav Kirchhoff in 1845, are fundamental principles in electrical engineering that relate to current and potential difference in electrical circuits. They expanded upon the work of Georg Ohm and preceded James Clerk Maxwell's contributions. Known as Kirchhoff's rules or laws, they are widely used in network analysis and apply to both time and frequency domains.

Mechanics: Mechanics is a branch of math and physics that studies the interactions between force, matter, and motion in physical objects. It explains how forces cause objects to move or change position.

Ballistics: Ballistics is the study of projectiles launched from weapons, such as bullets and rockets. It involves understanding their flight behavior, impact effects, and designing them for optimal performance.

Continuum mechanics: Continuum mechanics is a field of mechanics that studies the deformation and force transmission in continuous materials rather than individual particles. It was initially developed by Augustin-Louis Cauchy in the 19th century.

Classical mechanics: Classical mechanics is a physical theory that explains the movement of large objects like projectiles, machinery parts, and celestial bodies. It differs from modern physics and was a significant shift in the field's methods and philosophy.

Flight: Flight is the movement of an object without touching any surface, occurring in the atmosphere or in outer space. It can be achieved through aerodynamic lift, buoyancy, or ballistic movement.

Kinematics: Kinematics is a subfield of physics that describes motion without considering the forces involved. It is often referred to as the "geometry of motion" and can be seen as a branch of mathematics. Kinematics uses geometry to determine the position, velocity, and acceleration of objects based on initial conditions. Forces are not considered in kinematics, as they fall within the realm of kinetics. For more information, refer to the field of analytical dynamics.

Relativistic mechanics: Relativistic mechanics encompasses mechanics compatible with special relativity (SR) and general relativity (GR), allowing for a description of particles or fluids moving at speeds comparable to the speed of light. It extends classical mechanics to high velocities and energies and includes electromagnetism, which was not possible in Galilean relativity. Special and general relativity serve as the foundations for relativistic mechanics. The unification of SR with quantum mechanics is known as relativistic quantum mechanics, while quantum gravity attempts to unify GR with quantum mechanics and remains an unsolved problem in physics.

Statics: Statics is a branch of mechanics that studies the forces and torque acting on a system in equilibrium with its surroundings, without any acceleration.

Oscillation: Oscillation is the repetitive variation of a measure around a central value or between different states. It is observed in phenomena like swinging pendulums and alternating current. In physics, oscillations are utilized to approximate complex interactions, such as atomic behavior.

Harmonic oscillator: A harmonic oscillator is a classical mechanics system that experiences a restoring force when displaced from its equilibrium position. The force is proportional to the displacement.

Simple harmonic motion: Simple harmonic motion refers to a periodic motion of an object caused by a restoring force. This force is proportionate to the object's distance from its equilibrium position and always acts towards it. The resulting oscillation follows a sinusoidal pattern, continuing indefinitely.

Quantum mechanics: Quantum mechanics is a physics theory that explains natural behavior at atomic and smaller scales. It forms the basis of various quantum fields like chemistry, technology, and information science.

Pauli exclusion principle: The Pauli exclusion principle, formulated by Austrian physicist Wolfgang Pauli, states that in quantum mechanics, identical particles with half-integer spins cannot occupy the same quantum state. This principle applies to electrons and other fermions and is a fundamental concept in quantum mechanics.

Quantum chromodynamics: Quantum chromodynamics (QCD) is the theory explaining the strong interaction between quarks using gluons. It is a non-abelian gauge theory with symmetry group SU(3) and plays a crucial role in the Standard Model. QCD introduces the concept of color as the analog of electric charge, and gluons act as force carriers. A significant amount of experimental evidence supports QCD.

Quantum electrodynamics: Quantum electrodynamics (QED) is a particle physics theory that combines quantum mechanics and special relativity to explain the interaction between light and matter. It mathematically describes the exchange of photons between charged particles, providing a complete understanding of how matter and light interact.

Quantum entanglement: Quantum entanglement is a phenomenon where particles become interconnected, sharing a quantum state that cannot be described independently. This property, absent in classical mechanics, is crucial to understanding quantum physics.

Quantum field theory: Quantum field theory (QFT) is a theoretical framework in physics that combines classical field theory, special relativity, and quantum mechanics. It is used to construct models of subatomic particles in particle physics and models of quasiparticles in condensed matter physics.

Quantum gravity: Quantum gravity is a field of physics that combines gravity with quantum mechanics. It explores how gravity behaves on a small scale, like near black holes, neutron stars, and during the early universe after the Big Bang.

Quantum tunnelling: Quantum tunnelling is a phenomenon in physics where particles, like electrons or atoms, can traverse through energy barriers that would typically be impassable based on classical mechanics. This occurs despite the particles lacking the necessary energy to overcome the obstacle.

Schrödinger equation: The Schrödinger equation is a fundamental equation in quantum mechanics that describes the behavior of particles. It was developed by Erwin Schrödinger in 1925 and is named after him. This equation, a linear partial differential equation, governs the wave function of quantum systems. Its discovery was a significant milestone in the advancement of quantum mechanics and led to Schrödinger receiving the Nobel Prize in Physics in 1933.

Uncertainty principle: The Uncertainty Principle in quantum mechanics, also known as Heisenberg's indeterminacy principle, sets a limit on the precision of simultaneously knowing pairs of physical properties like position and momentum. In simple terms, the more accurately we measure one property, the less accurately we can know the other.

Wave function: A wave function is a mathematical description of the quantum state of a system. It uses complex numbers to assign probabilities to different positions in space. The Born rule allows us to interpret these probabilities as actual measurements. The wave function must be normalized, meaning that its integral over all positions is equal to 1. However, only relative phase and magnitude can be measured, not absolute values or directions. To obtain measurable quantities, we apply quantum operators to the wave function and calculate statistical distributions.

Wave–particle duality: Wave-particle duality is the idea in quantum mechanics that quantum entities can behave as both particles and waves depending on the experimental conditions. Classical concepts like particle and wave fail to fully explain their behavior. This concept emerged from the discovery that light acts as both a wave and a particle, and electrons exhibit both particle-like and wave-like characteristics. Duality was introduced to describe these contradictions.

Hamiltonian mechanics: Hamiltonian mechanics, introduced by Sir William Rowan Hamilton, is a reformulation of Lagrangian mechanics from 1833. It replaces velocities with momenta and describes classical mechanics while interpreting the same physical phenomena.

Lagrangian mechanics: Lagrangian mechanics is a branch of classical mechanics that is based on the principle of stationary action. It was developed by Joseph-Louis Lagrange in the late 18th century.

Mass: Mass is an intrinsic property of a body, not solely determined by the quantity of matter. Different atoms and particles can have the same amount of matter but different masses. In modern physics, mass has multiple definitions but is experimentally measured as a body's inertia and determines its gravitational attraction to other bodies.

Density: Density is a substance's mass per unit volume, often represented by ρ or D. It is calculated as mass divided by volume.

Conservation of mass: The law of conservation of mass states that in a closed system, mass cannot be created or destroyed. It remains constant over time, as neither matter nor energy can be added or removed from the system. Hence, the quantity of mass is conserved.

Momentum: Momentum is a vector quantity in Newtonian mechanics calculated as the product of an object's mass and velocity. It represents the object's magnitude and direction. The formula for momentum is represented as p = mv.

Force: Force is a physical influence that can alter an object's velocity, causing it to accelerate. It is mathematically defined and includes the notions of pushing, pulling, and counteractions. Force is a vector quantity, with magnitude and direction being significant. The unit of force is the newton (N) and it is denoted by the symbol F.

Motion: Motion is the change in position of an object over time. It can be described using various measurements such as displacement, distance, velocity, acceleration, and speed. The field of kinematics studies motion without considering its cause, while dynamics explores the impact of forces on motion.

Newton's laws of motion: Newton's laws of motion are three fundamental laws that define the relationship between an object's motion and the forces acting upon it. These laws explain that an object will remain at rest or move in a straight line at a constant speed unless acted upon by a force. The net force on an object is equal to its mass multiplied by its acceleration, or the rate of change in momentum with time. Additionally, if two bodies interact, the forces they exert on each other have equal magnitudes but opposite directions.

Speed: Speed refers to the measure of how fast an object is moving, and is represented by the magnitude of its position change over time. It is a scalar quantity indicating only the magnitude of motion, unlike velocity which also determines direction. Average speed is calculated as distance divided by time, while instantaneous speed is the limit of average speed as time interval approaches zero.

Velocity: Velocity is the measure of an object's speed and direction of motion. It is a fundamental concept in kinematics, a branch of classical mechanics that explains body motion.

Acceleration: Acceleration refers to the change in velocity of an object over time. It is a component of kinematics, which studies motion. Acceleration is a vector quantity and its direction is determined by the net force acting on the object. Its magnitude depends on the net resulting force and the object's mass, as described by Newton's Second Law.

Equations of motion: Equations of motion describe the behavior of a physical system's motion over time. They use mathematical functions to define the system's dynamics, often involving spatial coordinates, time, and momentum. These equations can be solved to understand how the system moves based on known dynamics, either in classical mechanics using Euclidean space or in relativity using curved spaces.

Kinetic energy: Kinetic energy is the energy an object has because it is moving.

Potential energy: Potential energy is the stored energy possessed by an object due to its position, internal stresses, electric charge, or other factors. The concept was named by William Rankine but can be traced back to Aristotle's idea of potentiality.

Inertia: Inertia is a fundamental principle in physics, described by Isaac Newton as objects in motion staying in motion and objects at rest staying at rest unless acted upon by a force. It is a manifestation of mass and is governed by Newton's first law of motion. The summary is concise, focusing on the key features of inertia.

Moment of inertia: The moment of inertia is a property of a rigid body that determines the torque needed for a desired change in rotation. It depends on the body's mass distribution and the chosen axis, with larger moments requiring more torque to alter the rate of rotation.

Friction: Friction is a force that opposes the movement of surfaces, layers, and elements sliding against each other. It has various types, including dry, fluid, lubricated, skin, and internal friction.

Impulse (physics): Impulse in physics refers to the change in momentum of an object. It is denoted as J and occurs when the initial momentum of an object, p1, is transformed into a subsequent momentum, p2.

Power (physics): Power in physics refers to the rate at which energy is transferred or converted. It is measured in watts, which is equal to one joule per second. Power is also known as activity in some older works and is considered a scalar quantity.

Work (physics): Work in physics refers to the transfer of energy to or from an object through the application of force along a displacement. It is calculated by multiplying the force strength by the distance traveled. If the force aligns with the direction of motion, it does positive work, while if it opposes the displacement, it does negative work.

Angular momentum: Angular momentum is the rotational counterpart of linear momentum. It is a conserved quantity, meaning it remains constant in a closed system. This property gives rise to the useful characteristics of objects like bicycles, flying discs, and gyroscopes. Angular momentum conservation explains the formation of spirals in hurricanes and the high rotational rates of neutron stars. While conservation determines the possible motion of a system, it does not uniquely define it.

Centripetal force: Centripetal force is a force that directs a body along a curved path. It always points towards the center of the path and is described by Isaac Newton as a force that draws bodies towards a center point. Gravity acts as the centripetal force in Newtonian mechanics, enabling astronomical orbits.

Rotation: Rotation refers to the circular movement of an object around an axis. It can occur in either a clockwise or counterclockwise direction. A plane figure rotates around a perpendicular axis intersecting at a center of rotation, while a solid figure can rotate around an infinite number of axes and angles, including chaotic rotation.

Torque: Torque, or moment of force, is the rotational equivalent of linear force in physics and mechanics. It measures the rate of change of angular momentum transmitted to a single object.

Weight: Weight is the force acting on an object in response to acceleration or gravity in science and engineering.

Weighing scale: A weighing scale is a device used to measure weight or mass. It is also known as a scale, balance, mass scale, or weight balance.

Frame of reference: A frame of reference is an abstract coordinate system used in physics and astronomy. It includes an origin, orientation, and scale specified by reference points, which are geometric points identified mathematically and physically.

Newton's law of universal gravitation: Newton's law of universal gravitation states that all particles in the universe attract each other with a force that depends on their masses and the distance between them. This law unifies the understanding of gravity on Earth with astronomical behaviors.

Coriolis force: The Coriolis force is an inertial force that affects objects in motion in a rotating frame of reference. It deflects objects to the left or right depending on the direction of rotation. The deflection caused by this force is known as the Coriolis effect. The mathematical expression for the Coriolis force was introduced by French scientist Gaspard-Gustave de Coriolis in 1835, in relation to water wheel theory. The term Coriolis force became commonly used in meteorology during the 20th century.

Fluid mechanics: Fluid mechanics is a physics branch that studies fluids and the forces acting on them. It applies to various fields like engineering, geophysics, biology, and meteorology.

Bernoulli's principle: Bernoulli's principle is a fundamental concept in fluid dynamics that explains the relationship between pressure, speed, and height in a fluid. It states that as fluid speed increases, static pressure decreases. The principle was first introduced by Daniel Bernoulli in 1738 and later derived as Bernoulli's equation by Leonhard Euler in 1752.

Buoyancy: Buoyancy, also known as upthrust, is the upward force exerted by a fluid that opposes the weight of an immersed object. The pressure at the bottom of a fluid column or submerged object is higher than at the top due to the weight of the overlying fluid. This pressure difference creates a net upward force on the object, equivalent to the weight of the fluid that would occupy the submerged volume.

Convection: Convection is the spontaneous flow of fluid caused by differences in material properties and body forces, mainly density and gravity. It can occur in both single or multiphase fluids and is often influenced by thermal expansion and buoyancy. Convection can also happen in soft solids or mixtures where particles can move.

Drag (physics): Drag is a force that opposes the motion of an object in relation to a fluid it is moving through. This force can occur between fluid layers or between a fluid and a solid surface.

Diffusion: Diffusion is the movement of substances from areas of high concentration to areas of low concentration, driven by differences in energy levels. It can occur in both directions, including from low to high concentration. This random process is widely used to model various real-life scenarios and is applied in fields like physics, finance, and marketing.

Fluid dynamics: Fluid dynamics is a field in physics, physical chemistry, and engineering that studies the movement of liquids and gases. It includes subdisciplines like aerodynamics and hydrodynamics. This branch of fluid mechanics has various applications, such as calculating forces on aircraft, predicting weather patterns, and understanding phenomena in space.

Aerodynamics: Aerodynamics is the study of air motion, especially around solid objects like airplane wings. It is a branch of fluid dynamics that is important in aeronautics. While gas dynamics is similar, aerodynamics specifically refers to air. The formal study began in the 18th century, with efforts mainly focused on achieving flight. Over time, the use of mathematical analysis, wind tunnels, and simulations has advanced flight and other technologies. Current research emphasizes compressible flow, turbulence, and computational methods.

Lift (force): Lift is the force exerted by a fluid on an object as it flows around it. It is perpendicular to the flow direction and counters gravity. It can act in any direction.

Navier–Stokes equations: The Navier–Stokes equations are partial differential equations that explain the behavior of viscous fluids. They were named after Claude-Louis Navier and George Gabriel Stokes, who came up with them between 1822 and 1850.

Osmosis: Osmosis is the movement of solvent molecules through a membrane from high to low water potential, equalizing solute concentrations. It can also describe solvent movement between solutions of different concentrations. Osmosis can be used to do work, and osmotic pressure is the external pressure required to stop solvent movement. Osmotic pressure depends on solute concentration, not identity.

Reynolds number: The Reynolds number is a dimensionless quantity used in fluid mechanics to predict fluid flow patterns. It compares inertial and viscous forces to determine if the flow is laminar or turbulent. Laminar flow occurs at low Reynolds numbers, while turbulent flow occurs at high Reynolds numbers. Turbulence is caused by differences in speed and direction of the fluid, which leads to churning and energy loss. The chances of cavitation, or the formation of vapor-filled cavities, increase with higher Reynolds numbers in liquids.

Surface tension: Surface tension is the property of a liquid surface to minimize its area, resulting in a shrinkage. This phenomenon enables objects denser than water, like razor blades and insects, to float without submerging.

Turbulence: Turbulence is a chaotic fluid motion that involves unpredictable changes in pressure and flow velocity. Unlike laminar flow where fluid flows smoothly in parallel layers, turbulence causes disruptions between these layers.

Viscosity: Viscosity measures a fluid's resistance to deformation at a specific rate. It corresponds to the thickness of liquids, with syrup having higher viscosity than water. Scientifically, viscosity is defined as force multiplied by time divided by area, and its SI units are newton-seconds per square meter, or pascal-seconds.

Solid mechanics: Solid mechanics is a field within continuum mechanics that examines how solid materials respond to various forces, temperature fluctuations, phase alterations, and other internal and external factors, by studying their motion and deformation.

Deformation (engineering): Deformation in engineering refers to changes in size or shape of an object. Displacement measures absolute change in position, while deflection is the relative change in external displacements. Strain expresses internal changes in shape and is related to stress by a curve. The relationship between stress and strain is linear until the yield point, beyond which permanent distortion occurs, known as plastic deformation. The study of stress and strain is important in strength of materials and structural analysis.

Elastic modulus: The elastic modulus measures an object or substance's ability to resist elastic deformation when stressed.

Elasticity (physics): Elasticity is the property of a substance to resist deformation and recover its original shape when the applied force is removed. Unlike plasticity, where the substance remains permanently deformed, elastic materials return to their initial size and shape after being distorted.

Fatigue (material): Fatigue in materials refers to the formation and spreading of cracks caused by repetitive loading. As the cracks grow, striations appear on the fracture surface. Eventually, the crack reaches a critical size, leading to rapid propagation and complete fracture when the stress intensity exceeds the material's fracture toughness.

Hooke's law: Hooke's law is an empirical law in physics that states the force needed to extend or compress a spring is proportional to the displacement of the spring from its equilibrium position. The law is named after Robert Hooke, a 17th-century British physicist who first stated it in 1676. The relationship is expressed as Fs = kx, where Fs is the force, k is a constant factor characterizing the spring, and x is the displacement. Hooke's law has been known since 1660 and provides a fundamental understanding of how springs behave.

Plasticity (physics): Plasticity in physics and materials science refers to a solid material's capability to undergo permanent deformation when subjected to external forces. This non-reversible change of shape, such as bending or pounding metal, occurs due to internal modifications within the material. In engineering, the shift from elastic behavior to plastic behavior is called yielding.

Stiffness: Stiffness: The measure of how an object opposes deformation when subjected to a force.

Strength of materials: Strength of materials is a field that analyzes stresses and strains in structural components like beams, columns, and shafts. It uses properties such as yield strength, ultimate strength, and Young's modulus to predict structural response and failure modes. Important factors considered include material properties, geometry changes, and boundary constraints.

Stress (mechanics): Stress (mechanics) is a term in continuum mechanics that represents the forces present during deformation. It relates to the stretching or shortening of an object due to pulling apart or pushing together. Stress depends on the magnitude of force and the area on which it acts. It is quantified as force per unit area, measured in newtons per square meter (N/m2) or pascal (Pa).

Statistical mechanics: Statistical mechanics is a mathematical framework in physics that uses statistical methods and probability theory to understand the behavior of large groups of tiny particles. It explains how the macroscopic behavior of nature can be derived from the behavior of these ensembles, without assuming or postulating any specific natural laws.

Nuclear physics: Nuclear, the study of atomic nuclei and interactions along with other forms of nuclear matter.

Radioactive decay: Radioactive decay is the emission of radiation energy from an unstable atomic nucleus. Materials with unstable nuclei are considered radioactive. It involves three common types of decay: alpha, beta, and gamma, with beta decay governed by the weak force, and the others by electromagnetism and nuclear force.

Alpha particle: Alpha particles, also known as alpha rays or alpha radiation, are made up of two protons and two neutrons, forming a helium-4 nucleus. They are usually produced during alpha decay but can also be generated in other ways. Named after the Greek letter α, their symbol is α or α2+. Being equivalent to helium nuclei, they can be denoted as He2+ or 42He2+, indicating a helium ion with a +2 charge. Once electrons are acquired, an alpha particle transforms into a regular helium atom 42He.

Beta particle: A beta particle is a high-energy electron or positron released during the radioactive decay of an atomic nucleus through beta decay. Beta decay produces electrons (β−) and positrons (β+).

Nuclear fission: Nuclear fission is a reaction where an atom's nucleus splits into smaller nuclei, emitting gamma photons and releasing a significant amount of energy.

Nuclear fusion: Nuclear fusion is a reaction where atomic nuclei, like deuterium and tritium, combine to form new nuclei, releasing or absorbing energy due to changes in their binding energy. This process powers stars and releases massive amounts of energy.

Nucleosynthesis: Nucleosynthesis is the process of creating atomic nuclei from existing nucleons and nuclei. It began shortly after the Big Bang, resulting in the formation of hydrogen and helium. Later, in stars and their explosions, nucleosynthesis produced the variety of elements and isotopes we have today. The amounts of heavier elements in the universe remain relatively small.

Particle physics: Particle physics (or high-energy physics) is the exploration of the fundamental particles and forces that make up matter and radiation. It investigates the combinations of elementary particles, including protons and neutrons, with a distinct focus on nuclear physics for protons and neutrons.

Standard Model: The Standard Model is a theory in particle physics that explains three of the four fundamental forces and categorizes all known elementary particles. It was developed by scientists over several decades and was further validated by the discovery of quarks, top quarks, tau neutrinos, and the Higgs boson. Additionally, the Standard Model accurately predicts specific properties of weak neutral currents, W and Z bosons.

Physics beyond the Standard Model: Physics beyond the Standard Model (BSM) addresses the shortcomings of the Standard Model by tackling various puzzles. These include unresolved fundamental parameters, the strong CP problem, neutrino oscillations, matter–antimatter asymmetry, and the mysteries surrounding dark matter and dark energy. Moreover, BSM explores the compatibility issues between the Standard Model and general relativity, particularly when facing conditions like the Big Bang or black hole event horizons.

String theory: String theory is a physics framework that replaces point-like particles with one-dimensional strings. These strings move and interact in space, with their properties determined by their vibrations. One of these vibrations gives rise to the graviton, a quantum particle associated with gravity. Therefore, string theory serves as a theory of quantum gravity.

Supersymmetry: Supersymmetry is a theoretical physics framework suggesting a symmetry between particles with different spins. It proposes partner particles for every known particle. Experiments have yet to find evidence for its existence, but if proven, it could explain phenomena like dark matter and the hierarchy problem in particle physics.

Particle: In physical sciences, particles are small objects with physical or chemical properties like volume, density, or mass. They range in size from subatomic particles to microscopic atoms and molecules to macroscopic powders and granular materials. They can also represent larger objects depending on their density, like people in a crowd or celestial bodies in motion.

Scattering: Scattering is a physical phenomenon where particles or radiation are deflected from their original path due to irregularities in the medium they pass through. It includes deviations in reflected radiation. Originally used in reference to light, the concept of scattering expanded to other ray-like phenomena and was linked to heat and acoustic scattering. The discovery of subatomic particles and the application of quantum theory broadened the understanding of scattering and its mathematical frameworks.

Spin (physics): Spin is a type of angular momentum found in elementary particles and composite particles like atoms. Initially believed to be the rotation of a small rigid particle, it is now understood as angular momentum generated by a flow of charge in the electron's wave field. [source: Wikipedia]

Particle accelerator: A particle accelerator is a machine that uses electromagnetic fields to accelerate charged particles to high speeds and energies, creating well-defined beams.

Large Hadron Collider: The Large Hadron Collider (LHC) is a massive particle collider constructed by CERN. It is the largest and most powerful collider in the world, built with the collaboration of thousands of scientists from over 100 countries. The LHC resides in a 27-kilometer tunnel beneath the France-Switzerland border near Geneva, reaching depths of up to 175 meters.

Tevatron: The Tevatron was a particle accelerator in the US, operating from 1983 to 2011. It was the second-highest energy collider ever built, after the LHC. Located in Illinois, it accelerated protons and antiprotons in a 6.28 km ring to energies up to 1 TeV, costing $120 million to complete.

Particle detector: A particle detector, also called a radiation detector, is a device used in physics and engineering to detect, track, and identify ionizing particles. It measures attributes like energy, momentum, charge, and type in addition to detecting particles produced by nuclear decay or cosmic radiation.

Cloud chamber: A cloud chamber is a particle detector that shows ionizing radiation passing through it. It is also called a Wilson cloud chamber.

Subatomic particle: A subatomic particle is a smaller particle than an atom, which can be composite or elementary. It is studied in physics, particularly in particle and nuclear physics. Bosons, like photons or gluons, are force carriers without rest mass or discrete diameter, while fermions cannot overlap or combine and have rest mass.

Hadron: A hadron is a subatomic particle composed of quarks held together by the strong force. They are similar to molecules held together by electric forces. Protons and neutrons, the main components of ordinary matter, are examples of hadrons. The mass of these particles is primarily derived from the binding energy of their constituent quarks, which is attributed to the strong force.

Fermion: Fermions are particles that adhere to Fermi-Dirac statistics. They have half-odd-integer spins (e.g., 1/2, 3/2) and obey the Pauli exclusion principle. This group encompasses quarks, leptons, baryons, and many atoms and nuclei, composed of an odd number of these particles. They are distinctive from bosons, which follow Bose-Einstein statistics.

Lepton: A lepton is an elementary particle with half-integer spin, not affected by strong interactions. There are two types: charged leptons and neutral leptons. Charged leptons can form composite particles like atoms, while neutrinos are rarely observed due to their lack of interaction. The electron is the most well-known lepton.

Electron: An electron is a subatomic particle with a negative electric charge. It is considered elementary because it has no known components or substructure. It is part of the lepton particle family and has a mass of about 1/1836 that of a proton. Electrons have an intrinsic angular momentum and are fermions, meaning two electrons cannot occupy the same quantum state. They display both particle and wave-like behavior, being able to collide with other particles and diffract like light. The wave properties of electrons are easier to observe than those of other particles due to their lower mass and longer de Broglie wavelength.

Muon: A muon is an elementary particle with a charge of -1 e and mass greater than an electron. It is a lepton and considered a fundamental particle, not composed of any simpler particles.

Tau (particle): The tau, also known as the tau lepton or tauon, is an elementary particle similar to the electron. It has a negative electric charge and a spin of 1/2. Like other leptons, it has an antiparticle called the "antitau". Tau particles are denoted by τ−, while the antitau is denoted by τ+.

Neutrino: A neutrino is an electrically neutral fermion that interacts only through weak and gravity forces. It has a very small rest mass, making it nearly massless. Neutrinos do not participate in electromagnetic or strong interactions, allowing them to pass through matter without being detected.

Quark: A quark is an elementary particle that combines to form stable particles called hadrons. Protons and neutrons are the most stable hadrons and make up atomic nuclei. Quarks are never found in isolation due to color confinement, making observations of hadrons crucial in understanding quarks.

Baryon: A baryon is a subatomic particle made up of three quarks, and it belongs to the hadron family. Baryons have odd numbers of valence quarks and exhibit half-integer spin, classifying them as fermions.

Neutron: A neutron is a subatomic particle with no charge and a slightly greater mass than a proton. It, along with protons, makes up the nuclei of atoms. Neutrons and protons behave similarly and are collectively called nucleons. They have a mass of approximately one atomic mass unit. Neutrons are not elementary particles; they consist of three quarks.

Proton: A proton is a stable subatomic particle with a positive charge of +1 e and is symbolized as p or H+. It has a slightly smaller mass than a neutron and is approximately 1,836 times more massive than an electron. Protons, along with neutrons, are called nucleons and are present in atomic nuclei.

Boson: A boson is a subatomic particle with an integer spin quantum number. It is one of the two fundamental classes of particles, with fermions being the other. All observed subatomic particles are either bosons or fermions.

Gauge boson: A gauge boson is a force-carrying elementary particle that enables interactions between elementary particles described by gauge theory. It acts as a mediator exchanging virtual particles.

Photon: A photon is an elementary particle and the fundamental unit of light and other forms of electromagnetic radiation. It is a force carrier for the electromagnetic force and travels at the speed of light in a vacuum. Photons are massless and belong to the boson particle class.

Gluon: A gluon is an elementary particle, massless, with a spin of 1, that mediates the strong interaction between quarks. It binds quarks together, forming particles like protons and neutrons through quantum chromodynamics.

W and Z bosons: The W and Z bosons, also known as weak bosons or intermediate vector bosons, are elementary particles that mediate the weak interaction. The W± bosons have a positive or negative charge and are each other's antiparticles, while the Z0 boson is electrically neutral and is its own antiparticle. These particles have a spin of 1 and are very short-lived. Their discovery was crucial in establishing the Standard Model of particle physics.

Higgs boson: The Higgs boson, or Higgs particle, is a fundamental particle in particle physics theory. It is a massive scalar boson with no electric or color charge, and it couples to mass. The Higgs boson is produced by the quantum excitation of the Higgs field and rapidly decays into other particles.

Meson: A meson is a subatomic particle composed of equal numbers of quarks and antiquarks, bound by the strong interaction. They have a physical size about 0.6 times that of a proton or neutron. Mesons are unstable and decay into lighter mesons and ultimately stable particles like electrons, neutrinos, and photons.

Antimatter: Antimatter is a form of matter made up of antiparticles with reversed charge, parity, and time. It exists naturally in cosmic ray collisions and some radioactive decays. However, only a very small amount has been successfully bound together in experiments to form antiatoms. Generating antimatter is challenging and costly, with total artificial production being minuscule. Despite this, antimatter plays a crucial role in various applications like positron emission tomography, radiation therapy, and industrial imaging.

Antiparticle: In particle physics, every particle has an antiparticle with the same mass but opposite charges. For instance, the electron's antiparticle is the positron, which has a positive charge. Antiparticles are produced naturally in some radioactive decay processes, and their counterparts have reversed charges.

Positron: Positron, the antiparticle of the electron, has a positive charge, equal mass, and a spin of 1/2. Annihilation happens when it collides with an electron, producing multiple photons at low energies.

Theory of relativity: The theory of relativity, developed by Albert Einstein, comprises special relativity (1905) and general relativity (1915). Special relativity applies to all physical phenomena without gravity, while general relativity explains the law of gravitation in relation to the forces of nature. It applies to the cosmological and astrophysical realm, including astronomy.

General relativity: General relativity is Albert Einstein's theory of gravity, which describes gravity as a geometric property of space and time. It refines Newton's law of gravity and is considered the current description of gravitation in modern physics. The theory relates the curvature of spacetime to the energy and momentum of matter and radiation, and is defined by the Einstein field equations.

Special relativity: Special relativity is a scientific theory by Einstein that explains the relationship between space and time. It is based on two postulates: the laws of physics are the same in all frames of reference, and the speed of light is constant for all observers.

Principle of relativity: The principle of relativity states that the laws of physics should appear the same in all frames of reference. This principle requires the equations describing these laws to have the same form regardless of the observer's point of view.

Equivalence principle: The Equivalence principle suggests that gravitational and inertial mass are equivalent. This concept has two forms: the weak form applies to masses of any composition in free fall, while the extended form requires special relativity to hold and for the weak equivalence to be valid everywhere. Albert Einstein's extended form was crucial in developing the theory of general relativity. The strong form requires Einstein's equations to also apply to stellar objects. Extensive experimental tests have been conducted to confirm the principle's accuracy.

Gravitational wave: Gravitational waves are gravity's equivalent of electromagnetic waves, generated by accelerating masses and propagating at the speed of light. Oliver Heaviside proposed them in 1893, and Henri Poincaré confirmed their existence in 1905.

Lorentz transformation: The Lorentz transformations are linear transformations between coordinate frames in spacetime. They relate frames moving at a constant velocity to each other and their inverse is parameterized by the negative of this velocity. These transformations are named after physicist Hendrik Lorentz.

Michelson–Morley experiment: The Michelson-Morley experiment, conducted in 1887, aimed to measure Earth's motion relative to the luminiferous aether, a hypothetical medium thought to carry light waves. Physicists Albert A. Michelson and Edward W. Morley performed the experiment in Cleveland, Ohio, and published their findings later that year.

Causality (physics): Causality in physics refers to the fundamental physical relationship between causes and effects. It is crucial in all natural and behavioral sciences, particularly in physics. Additionally, causality is studied in philosophy, statistics, and logic. In essence, it states that an effect cannot occur without a cause that is within its past light cone, and a cause cannot have an effect beyond its future light cone.

Thermodynamics: Thermodynamics is a physics branch that studies heat, work, and temperature and their relationship to energy, entropy, and matter/radiation properties. It is governed by four laws that describe these quantities using measurable macroscopic properties but can also be understood through statistical mechanics. It finds applications in various scientific and engineering fields, including physical chemistry, biochemistry, chemical engineering, mechanical engineering, and meteorology.

Heat: Heat is the transfer of thermal energy between systems caused by temperature differences. It is often used to refer to thermal energy itself, which is the kinetic energy of atoms in a substance vibrating and colliding.

Temperature: Temperature is a measure of hotness or coldness and is determined using a thermometer. It represents the movement and interaction of atoms in a substance.

Absolute zero: Absolute zero is the lowest possible temperature on the thermodynamic scale, at which the enthalpy and entropy of a cooled ideal gas reach their minimum. This state signifies the absence of any vibrational motion in fundamental particles, except for quantum mechanical, zero-point energy-induced motion. By international agreement, absolute zero is considered as -273.15 degrees Celsius or -459.67 degrees Fahrenheit. The Kelvin and Rankine temperature scales both define their zero points at absolute zero.

Pressure: Pressure is the perpendicular force exerted on an object's surface per area. Gauge pressure is the pressure relative to the ambient pressure.

Laws of thermodynamics: The laws of thermodynamics are scientific laws that define physical quantities and processes in thermodynamic systems at equilibrium. They establish relationships between temperature, energy, entropy, heat, and work. These laws form the basis for understanding phenomena and preclude perpetual motion. They are fundamental laws in physics and are applicable in various natural sciences.

Heat capacity: Heat capacity, or thermal capacity, is a measure of the heat energy needed to raise an object's temperature by one degree. It is measured in joules per kelvin (J/K).

Heat transfer: Heat transfer is a field of thermal engineering that involves the exchange of thermal energy between different physical systems. It includes mechanisms like conduction, convection, radiation, and phase change. Engineers also consider mass transfer for achieving heat transfer. These mechanisms often occur together in the same system.

Entropy: Entropy is a scientific concept related to disorder and uncertainty. It is utilized in various fields, including thermodynamics, statistical physics, information theory, chemistry, physics, biology, cosmology, economics, sociology, weather science, climate change, and information systems.

Internal energy: The internal energy of a thermodynamic system is the total energy contained within it, accounting for energy changes and excluding kinetic and potential energy of the system as a whole. It includes thermal energy and cannot change in an isolated system due to the law of conservation of energy.

Thermodynamic cycle: A thermodynamic cycle is a sequence of processes that transfer heat and work into and out of a system while varying pressure, temperature, and other state variables. It can convert heat into useful work and transfer remaining heat to a cold sink, acting as a heat engine. Conversely, it can use work to move heat from a cold source to a warm sink, acting as a heat pump. If the system is in thermodynamic equilibrium at every point, the cycle is reversible, and the net entropy change is zero.

Thermodynamic free energy: Thermodynamic free energy is a state function in thermodynamics that represents the maximum work a system can perform at constant temperature. Its change indicates if a process is favorable or forbidden. The free energy is not absolute, but relative values and changes are meaningful due to its dependence on a chosen zero point.

Ideal gas law: The ideal gas law is an equation that describes the behavior of a hypothetical ideal gas. It combines Boyle's law, Charles's law, Avogadro's law, and Gay-Lussac's law. Although it has limitations, it is a good approximation for many gases under various conditions.

Enthalpy: Enthalpy is a thermodynamic property that combines a system's internal energy, pressure, and volume. It is commonly used in measurements of chemical, biological, and physical systems at constant pressure. Enthalpy represents the energy, including bond and lattice energies, within a system. It is independent of the path taken to reach its final configuration.

Black-body radiation: Black-body radiation is the emission of thermal electromagnetic radiation by an object in equilibrium. It consists of a continuous spectrum of wavelengths, determined solely by the object's temperature.

Wave: A wave is a dynamic disturbance that propagates in physics, mathematics, engineering, and related fields. It can be periodic, oscillating around an equilibrium value at a certain frequency. Waves can be traveling or standing, depending on their direction of movement. Standing waves have nulls where the amplitude becomes zero. They are commonly described by wave equations for single wave propagation in a defined direction.

Acoustics: Acoustics is the study of mechanical waves in gases, liquids, and solids, including sound, ultrasound, and infrasound. An acoustician is a scientist in this field, while an acoustical engineer specializes in acoustics technology. Acoustics is widely applied in modern society, particularly in audio and noise control industries.

Sound: Sound is a vibration that travels as an acoustic wave through a gas, liquid, or solid. Humans perceive these waves, within the frequency range of 20 Hz to 20 kHz, as sound. Ultrasound refers to frequencies above 20 kHz, while infrasound represents frequencies below 20 Hz. Animal species have varying hearing ranges.

Speed of sound: The speed of sound is the distance sound travels per unit of time in an elastic medium. In air at 20°C (68°F), it is about 343 m/s or one km in 2.91 s. The speed changes with temperature and medium. As a simple explanation, it is how fast vibrations travel.

Ultrasound: Ultrasound is high-frequency sound beyond the range of human hearing, typically above 20 kilohertz. It encompasses the principles of acoustic waves, extending from 20 kHz to gigahertz frequencies.

Amplitude: Amplitude refers to the measure of change in a periodic variable within a single period. It also represents the magnitude of a non-periodic signal compared to a reference value. The concept of amplitude involves different definitions based on the magnitude of differences between extreme values. In older references, the phase of a periodic function may be referred to as amplitude.

Frequency: Frequency is the number of times a repeating event occurs in a given time unit, typically measured in hertz. It can also be called temporal frequency to avoid confusion with spatial frequency. The period is the time interval between events, with the relationship between period and frequency being reciprocal.

Wavelength: Wavelength is the distance over which a wave repeats its shape. It is the distance between consecutive points of the same phase on the wave. It is a characteristic of both traveling and standing waves. The inverse of wavelength is spatial frequency. The Greek letter lambda (λ) is commonly used to represent wavelength. The term can also apply to modulated waves and sinusoidal envelopes formed by interference.

Diffraction: Diffraction refers to the interference or bending of waves around an obstacle or through an aperture. The obstacle or aperture becomes a secondary source of the wave. It was first observed by Italian scientist Francesco Maria Grimaldi in 1660.

Doppler effect: The Doppler effect is the change in wave frequency based on the movement of an observer relative to the wave source. It was first described by physicist Christian Doppler in 1842. A common example is the change in pitch heard when a vehicle with a horn approaches and moves away from an observer. The frequency is higher when approaching, the same when passing, and lower when receding.

Wave interference: Wave interference is a phenomenon in physics where two coherent waves combine, resulting in a wave with either higher intensity or lower amplitude. It occurs with various types of waves, such as light, radio, sound, and water waves, as well as in electrical waves in loudspeakers.

Noise: Noise is undesired, disruptive sound that is loud and unpleasant to hear. It is indistinguishable from desired sound in terms of physics, as both are vibrations in a medium. However, the brain's perception of a sound determines whether it is classified as noise.

Resonance: Resonance is the phenomenon where an object or system absorbs energy and vibrates with greater amplitude when exposed to an external force or vibration that matches its natural frequency. It can occur in mechanical, electrical, or acoustic systems and has both beneficial applications, like in musical instruments and radio receivers, as well as harmful effects, such as excessive vibrations or structural failure.

Superposition principle: The superposition principle states that in linear systems, the combined response to multiple stimuli is the sum of their individual responses. For example, if input A produces response X and input B produces response Y, then the combined input (A + B) produces response (X + Y).

Wave equation: The wave equation is a fundamental equation in physics that describes various types of waves, such as mechanical and electromagnetic waves. It is a second-order linear partial differential equation and has applications in acoustics, electromagnetism, and fluid dynamics.

Technology: Technology is the use of knowledge to achieve practical goals, both in tangible tools like machines and intangible ones like software. It is essential in science, engineering, and everyday life.

Engineering: Engineering is the application of science, math, and design to solve problems, enhance efficiency, and advance various systems. It encompasses diverse subfields like infrastructure, machinery, electronics, and energy systems, aiming to improve them.

Nanotechnology: Nanotechnology involves manipulating matter at the nanoscale, which is one to 100 nanometers in size. At this scale, surface area and quantum mechanical effects play a significant role in determining properties of materials. Nanotechnology encompasses various research and technologies that leverage these unique properties. It is often referred to as nanoscale technologies or nanotechnologies. In the past, nanotechnology referred specifically to the precise manipulation of atoms and molecules to create larger products, now known as molecular nanotechnology.

Nuclear technology: Nuclear technology involves atomic nucleus reactions, including nuclear reactors, nuclear medicine, and nuclear weapons. It is also utilized in smoke detectors and gun sights.

Technical drawing: Technical drawing is the practice of creating detailed drawings that visually demonstrate how something is constructed or functions.

Biomedical engineering: Biomedical engineering (BME) applies engineering principles to medicine and biology for healthcare purposes, including diagnosis, monitoring, and therapy. Biomedical engineers also manage medical equipment in hospitals, ensuring proper procurement, testing, maintenance, and equipment recommendations. This role is sometimes referred to as a Biomedical Equipment Technician (BMET) or clinical engineer.

Chemical engineering: Chemical engineering is an engineering field focused on designing and operating chemical plants and improving production. It utilizes chemistry, physics, mathematics, biology, and economics to efficiently use energy and materials. Chemical engineers develop processes converting raw materials into useful products, from laboratory-scale nanotechnology to large-scale industrial processes. They are involved in various aspects of plant design, safety assessments, process analysis, control engineering, and construction specifications.

Civil engineering: Civil engineering is an engineering field that focuses on designing, constructing, and maintaining infrastructure such as roads, bridges, buildings, and transportation systems. It also includes managing public works projects like dams, airports, sewage systems, and pipelines.

Architectural engineering: Architectural engineering, also called building engineering, combines engineering and construction in the design and development of buildings. It encompasses various areas including structure, systems, environment, and security. This discipline is distinct from architectural design, focusing on the technical aspects of building creation.

Electrical engineering: Electrical engineering is the study and design of equipment, devices, and systems that utilize electricity, electronics, and electromagnetism. It became a recognized field of engineering in the late 19th century following the widespread use of electric telegraphs, telephones, and power generation.

Industrial engineering: Industrial engineering is an engineering field that revolves around enhancing and streamlining intricate processes, systems, and organizations. It accomplishes this by developing, improving, and integrating various elements such as people, money, knowledge, information, and equipment. This profession plays a pivotal role in manufacturing operations.

Mechanical engineering: Mechanical engineering is an ancient branch of engineering that deals with designing, analyzing, manufacturing, and maintaining physical machines. It combines principles of engineering physics, mathematics, and materials science to achieve this.

Aerospace engineering: Aerospace engineering is the main area of engineering that focuses on creating aircraft and spacecraft. It comprises aeronautical engineering and astronautical engineering, while avionics engineering deals with the electronics aspect of aerospace engineering.

Automotive engineering: Automotive engineering is a branch of vehicle engineering that combines mechanical, electrical, electronic, software, and safety engineering. It involves designing, manufacturing, and operating motorcycles, automobiles, and trucks, as well as modifying vehicles. The field is research intensive, applying mathematical models and involves the entire process from concept to production stage. It encompasses production, development, and manufacturing as its core functions.

Military engineering: Military engineering involves the design and construction of military structures, maintenance of military transport and communications, and logistical support for military operations. It differs from civil engineering and also incorporates disciplines like mechanical and electrical engineering. Additionally, it includes CBRN defense in modern times.

Software engineering: Software engineering is a discipline that applies engineering principles to develop and maintain computer software. It involves designing, developing, testing, and evaluating software. A software engineer is an individual who employs the engineering design process in their work, with an emphasis on software development rather than just programming.

Agricultural science: Agricultural science is a multidisciplinary field that combines various sciences to study and practice agriculture. It encompasses biology, economics, and social sciences. Agricultural scientists, also known as agriculturists, are professionals in this field.

Beekeeping: Beekeeping is the maintenance of bee colonies, primarily honey bees, in man-made beehives. It involves collecting honey, beeswax, propolis, bee pollen, and royal jelly, along with other honey-producing bees like stingless bees. Beekeepers also earn income by pollinating crops, raising queens, and selling package bees. Bee hives are kept in an apiary or "bee yard".

Dairy: A dairy is a location where milk is stored, and butter, cheese, and other dairy products are manufactured or sold. It can be a room, building, or larger facility. In the US, it can also refer to a dairy farm or part of a mixed farm dedicated to producing milk for human consumption from various animals.

Extensive farming: Extensive farming is a production system that requires minimal labor, fertilizers, and capital compared to the size of the farmland being used.

Gardening: Gardening is the art of growing plants for various purposes. It involves cultivating ornamental plants for their aesthetic appeal, while also yielding useful plants like fruits, vegetables, and herbs for consumption, dyeing, and medicinal or cosmetic use.

Intensive farming: Intensive farming or intensive agriculture is a method of farming that involves high input and output levels per unit of land. It includes both crop cultivation and animal rearing. Key characteristics of intensive farming are a low fallow ratio, increased use of capital, labor, agrochemicals, and water, and higher crop yields per unit of land area.

Orchard: An orchard is a cultivated area of trees or shrubs grown primarily for food production. It consists of fruit- or nut-producing trees and is usually intended for commercial purposes. Orchards can also enhance the beauty of large gardens and serve both aesthetic and productive purposes. They are similar to fruit gardens but on a smaller, non-commercial scale and may focus more on berry shrubs. Most orchards in temperate zones are arranged in a regular grid pattern with a manageable base, making maintenance and harvesting convenient.

Organic farming: Organic farming, also called ecological or biological farming, is an agricultural system that uses organic fertilizers and emphasizes techniques like crop rotation and companion planting. It emerged in the early 20th century in response to changing farming methods. Certified organic agriculture covers 70 million hectares globally, with over half in Australia. It encourages biological pest control, mixed cropping, and insect predator proliferation. Organic standards allow naturally-occurring substances but restrict synthetic ones, permitting substances like copper sulfate but prohibiting GMOs and sewage sludge. Advocates argue that organic farming offers sustainability, self-sufficiency, health, and food safety benefits.

Sustainable agriculture: Sustainable agriculture is a farming approach that meets current food and textile needs without compromising future generations. It prioritizes ecosystem services and employs various methods to increase sustainability. This practice emphasizes flexible business processes and farming techniques. However, agriculture's significant environmental impact contributes to climate change, water scarcity, pollution, land degradation, deforestation, and more. To counteract these effects, sustainable agriculture relies on environmentally friendly farming methods that protect human and natural systems. It encompasses practices like permaculture, agroforestry, mixed farming, multiple cropping, and crop rotation.

Subsistence agriculture: Subsistence agriculture is when farmers cultivate crops for their own needs on small plots, without generating surplus for trade. It primarily aims at survival and local consumption, with planting decisions based on family requirements rather than market prices. Those practicing subsistence agriculture are self-sufficient and do not rely on regular purchases from the marketplace.

Urban agriculture: Urban agriculture refers to cultivating and distributing food in cities. It includes activities like animal husbandry, aquaculture, beekeeping, and horticulture. It is different from rural peri-urban agriculture that occurs on the outskirts of suburbs.

Aquaculture: Aquaculture, also called aquafarming, is the controlled cultivation of aquatic organisms for various purposes. It involves farming fish, crustaceans, mollusks, algae, and aquatic plants in freshwater, brackish water, or saltwater environments. Unlike commercial fishing, which harvests wild fish, aquaculture provides a way to sustainably produce these resources. Mariculture, also known as marine farming, focuses on cultivating organisms in seawater habitats and lagoons, while pisciculture specifically refers to fish farming for food production.

Pesticide: Pesticides are substances used to control pests, including herbicides, insecticides, and fungicides. They protect plants from weeds, fungi, insects, and other harmful organisms. However, their use can have drawbacks, like potential toxicity to humans and other species.

Barn: A barn is an agricultural building commonly found on farms. In North America, barns house livestock, equipment, and grain. The term "barn" is often qualified to specify its purpose (e.g. tobacco barn, dairy barn). In the British Isles, barns are used mainly for storing unthreshed cereals and fodder, while cow shelters are called byre or shippon, and horses are kept in stables. In mainland Europe, barns were often part of integrated structures known as byre-dwellings. Barns can also serve as equipment storage, covered workplaces, and spaces for activities like threshing.

Farm: A farm is an area of land dedicated to agricultural processes for producing food and crops. It includes specialized units for various crops and livestock types. Farms encompass a range of facilities, such as ranches, orchards, and smallholdings, along with the farmhouse and agricultural buildings. In modern times, farms also extend to industrial operations like wind farms and fish farms, operating on land or at sea.

Garden: A garden is a planned outdoor space for cultivating and displaying plants and nature. Control is a defining aspect, even in wild garden designs. It can consist of both natural and artificial elements.

Granary: A granary is a barn storage room for grain or animal feed. Ancient granaries are made of pottery and are raised above the ground to protect from animals and floods.

Silo: A silo is a structure used for storing bulk materials, such as grain, coal, and food products. It is different from a grain bin, which specifically stores grains. Silos come in three main types: tower silos, bunker silos, and bag silos.

Stable: A stable is a building for housing livestock, like horses. It typically consists of separate stalls for individual animals. Various types of stables exist, such as the American-style barn with individual stalls or free-standing stables. Additionally, the term "stable" can refer to a group of animals owned by one person, regardless of where they are housed.

Animal husbandry: Animal husbandry is the agriculture branch dedicated to raising animals for various products like meat, milk, and fiber. It involves the daily care, breeding, and management of livestock. This practice dates back to the Neolithic Revolution, with animals being domesticated before the first crops were farmed. Early civilizations like ancient Egypt raised cattle, sheep, goats, and pigs on farms.

Breed: A breed is a group of domestic animals with consistent physical appearance, behavior, and characteristics that distinguish them from others of the same species. Breeds are created through genetic isolation, adaptation to the environment, selective breeding, or a combination of these factors. There is no universally accepted definition for breeds, as it depends on the consensus among breeders.

Domestication: Domestication is a long-term mutually beneficial association between humans and other organisms, involving human control and care for a consistent supply of resources, particularly food. This process occurred gradually across different regions and relied on experimentation and learning from mistakes.

Hay: Hay is dried grass or plants used as animal feed, including for livestock like cattle, horses, sheep, and goats, as well as smaller pets like rabbits and guinea pigs. Pigs can consume hay, but not as effectively as herbivores.

Livestock: Livestock refers to domesticated animals raised in agricultural settings to provide labor and a variety of products for consumption, including meat, eggs, milk, fur, leather, and wool. It can include animals raised for consumption or specific farmed ruminants like cattle, sheep, and goats. In the US, horses are also considered livestock. The USDA classifies pork, veal, beef, and lamb as livestock, categorizing all livestock as red meat. Poultry and fish are not classified as livestock, possibly because fish products fall under FDA regulations instead of USDA.

Selective breeding: Selective breeding is when humans deliberately choose which animals or plants will reproduce to develop specific traits. This process creates different breeds in animals and varieties in plants. Breeding different breeds or varieties can result in crossbreeds or hybrids. Professionals typically handle breeding major crops, while amateurs and professionals breed flowers, vegetables, and fruit-trees.

Agronomy: Agronomy is the science of growing and using plants for various purposes, including food, fuel, and land conservation. It involves research in plant genetics, physiology, meteorology, and soil science. Agronomists are professionals who apply multiple sciences such as biology, chemistry, economics, ecology, earth science, and genetics in their work.

Plant breeding: Plant breeding is the scientific process of altering plant traits to create desired characteristics. It is used to enhance nutrition in products for humans and animals. The main goals are to develop crop varieties with superior traits, such as stress tolerance, yield, quality, and ease of processing.

Cultivar: A cultivar is a cultivated plant selected for desired traits and retains those traits when propagated. Cultivars can be propagated by various methods such as division, cuttings, grafting, or seed production. They can originate from purposeful human manipulation or wild plants with distinctive characteristics. Cultivar names are determined by the International Code of Nomenclature for Cultivated Plants, and not all cultivated plants qualify as cultivars. The term "cultivar" means "cultivated variety" in horticulture.

Fertilizer: Fertilizers are natural or synthetic substances applied to soil or plants to provide essential nutrients. They differ from soil amendments. Fertilizers can be sourced naturally or industrially. In modern agriculture, nitrogen, phosphorus, and potassium are the primary nutrients, sometimes supplemented by micronutrients. Farmers use different application methods such as dry, pelletized, or liquid forms, employing large equipment or manual tools.

Harvest: Harvesting is the gathering of plants, animals, or fish for food, specifically the collection of mature crops. Reaping, done with tools like scythes or sickles, involves cutting grain or pulses. It is a labor-intensive task on smaller farms but uses machinery like combine harvesters on larger ones. Automation has improved efficiency in seeding and harvesting, with specialized equipment replacing manual seedling removal. Harvesting may also involve postharvest handling activities like cleaning, sorting, packing, and cooling.

Irrigation: Irrigation is the controlled application of water to land to aid in crop growth and landscaping. It has been practiced for thousands of years and is used worldwide. Besides supporting agriculture and vegetation in dry areas, irrigation also protects crops, suppresses weeds, prevents soil consolidation, cools livestock, reduces dust, disposes of sewage, and supports mining operations. Drainage, along with irrigation, involves removing water from a location and is often studied together.

Tillage: Tillage is the process of preparing agricultural soil through mechanical agitation like digging, stirring, and overturning. It can be done manually using tools like shovels, hoes, and rakes, or through draft-animal-powered or mechanized methods like ploughing, rototilling, rolling, harrowing, and cultivating.

Horticulture: Horticulture is the cultivation of plants in controlled environments like gardens or greenhouses. It involves growing a wide range of crops such as fruits, vegetables, nuts, herbs, and flowers, as well as non-food plants like grass and trees. Additionally, it encompasses aspects like plant conservation, landscape design and maintenance, and the care of ornamental trees and lawns.

Biotechnology: Biotechnology is a multidisciplinary field that applies natural sciences and engineering to use organisms, cells, and molecular analogues for products and services.

Genetic engineering: Genetic engineering, also known as genetic modification, manipulates an organism's genes using technology. It alters the genetic makeup of cells through gene transfer within and across species to create improved or novel organisms. This is achieved by copying or synthesizing DNA and inserting it into the host organism. Genes can be added or removed, and the process can be random or targeted. The first recombinant DNA molecule was created in 1972.

Genetically modified organism: Summary: A genetically modified organism (GMO) is any organism whose genetic material has been altered through genetic engineering. This includes altering an organism in a way that does not occur naturally. GMOs can be found in animals, plants, and microorganisms.

Cloning: Cloning is the creation of organisms with identical genomes either naturally or artificially. It occurs in nature through asexual reproduction, known as parthenogenesis. In biotechnology, cloning involves creating clones of cells and DNA fragments.

Gel electrophoresis: Gel electrophoresis is a technique used to separate biomolecules based on their size and charge. It is commonly used in clinical chemistry and molecular biology to separate proteins and DNA/RNA fragments, allowing for analysis of their characteristics and estimation of size.

Polymerase chain reaction: PCR is a technique developed in 1983 by Kary Mullis to rapidly generate millions of copies of a specific DNA sample. This amplification enables detailed study and analysis of even small DNA samples. Kary Mullis and Michael Smith were jointly awarded the Nobel Prize in Chemistry in 1993 for their contributions to DNA manipulation.

Computing: Computing encompasses goal-oriented activities utilizing computing machinery, involving the study and experimentation of algorithmic processes, and development of hardware and software. It encompasses scientific, engineering, mathematical, technological, and social aspects. Major disciplines within computing include computer engineering, computer science, cybersecurity, data science, information systems, information technology, and software engineering.

Information technology: Information technology (IT) covers computer systems, software, programming languages, data processing, and storage. It is a part of information and communications technology (ICT). An IT system includes hardware, software, and peripheral equipment, operated by a limited group of users. An IT project involves the creation and implementation of an IT system.

Abacus: The abacus, a hand-operated counting frame, is an ancient calculating tool used in various regions since ancient times. It predates the Hindu-Arabic numeral system by millennia and has been employed in the ancient Near East, Europe, China, and Russia.

Calculator: A calculator is a small and portable electronic device that can perform various calculations, from basic arithmetic to complex mathematics.

Data (computer science): In computer science, data refers to a sequence of symbols. A datum is a single symbol of data. Data becomes information through interpretation. Digital data uses binary representation. In modern computer systems, all data is digital.

Data communication: Data communication refers to the transmission and reception of data in digital or analog form over various communication channels like wires, fibers, or wireless networks. The data is represented as electromagnetic signals such as electrical voltage, radio waves, microwaves, or infrared signals.

Computer science: Computer science is the study of computation, information, and automation. It encompasses theoretical and applied disciplines. While primarily an academic discipline, computer science is closely linked to computer programming.

Artificial intelligence: Artificial intelligence (AI) is the intelligence exhibited by machines or software, developed in computer science, that allows them to perform tasks that typically require human intelligence. It is a field of study focused on creating and understanding intelligent machines, also known as AIs.

Computer architecture: Computer architecture is the structure and design of a computer system. It encompasses the instruction set, microarchitecture, logic design, and implementation. It provides a high-level description of how components come together to form the system.

Computer simulation: Computer simulation is a method of using mathematical models on a computer to predict the behavior or outcome of real-world systems. It is widely used in various fields, including physics, biology, economics, and engineering. Simulations help understand complex systems, estimate performance, and gain insights into new technologies.

Parallel computing: Parallel computing is a method of computation where multiple calculations are done simultaneously. It is used to solve large problems by dividing them into smaller parts that can be solved at the same time. Different types of parallel computing include bit-level, instruction-level, data, and task parallelism. With the increase in power consumption and physical constraints, parallel computing, specifically through multi-core processors, has become the dominant paradigm in computer architecture.

Computer security: Computer security refers to the safeguarding of computer systems and networks from unauthorized access, attacks, and damage by malicious individuals. It involves protecting hardware, software, and data from theft, disclosure, or harm, as well as ensuring uninterrupted services.

Malware: Malware is intentionally designed software that disrupts computer systems, compromises privacy, reveals sensitive information, or gains unauthorized access. It includes various sub-types as researchers classify it.

Cryptography: Cryptography, or cryptology, is the practice of secure communication amidst adversaries. It involves constructing and analyzing protocols to prevent third parties from reading private messages. This field merges mathematics, computer science, and various other disciplines to ensure information security. Cryptography finds applications in electronic commerce, payment cards, digital currencies, passwords, and military communications.

Encryption: Encryption is the encoding of information, converting it from plaintext to ciphertext. Only authorized parties can decipher the ciphertext and access the original information. While it does not prevent interference, encryption denies access to the intelligible content.

Authentication: Authentication is the process of verifying the identity of a computer system user or an object. It involves proving an assertion and validating personal identity documents, digital certificates, carbon dating, or detecting counterfeits.

Computer hardware: Computer hardware refers to the physical components of a computer, including the case, CPU, RAM, monitor, keyboard, mouse, storage, graphics and sound cards, speakers, and motherboard.

Computer: A computer is a programmable machine capable of carrying out arithmetic and logical operations automatically. It can perform various tasks through programs. The term "computer system" refers to a complete unit with hardware, operating system, software, and peripherals or a group of linked computers, like a network or cluster.

Supercomputer: A supercomputer is a highly powerful computer that performs at a much higher level than general-purpose computers. Its performance is measured in FLOPS, with the fastest supercomputers capable of performing over 1017 FLOPS. In comparison, desktop computers usually range from hundreds of gigaFLOPS to tens of teraFLOPS. Linux-based operating systems dominate the world's fastest 500 supercomputers. Ongoing research is focused on developing exascale supercomputers that are even faster and more advanced, being conducted in the United States, the European Union, Taiwan, Japan, and China.

Booting: Booting is the start-up process of a computer, initiated either by hardware or software. When a computer is turned on, the CPU lacks software in its main memory. To enable execution, software needs to be loaded into memory, which can be done by the CPU's hardware or firmware, or by a separate processor in the system.

Central processing unit: The Central Processing Unit (CPU) is the main processor in a computer that executes instructions of a computer program. It performs arithmetic, logic, control, and input/output operations. The CPU is distinct from external components like memory and specialized coprocessors such as graphics processing units (GPUs).

User interface: A user interface (UI) is the space where humans and machines interact in fields like industrial design. It enables effective control and operation of machines while providing feedback to aid decision-making. Examples include computer operating systems, hand tools, and machinery controls. Design considerations involve ergonomics and psychology.

Computer monitor: A computer monitor is an output device that displays visual or textual information. It consists of a visual display, support electronics, power supply, housing, connectors, and user controls.

Computer mouse: A computer mouse is a handheld device that detects motion on a surface. It translates this motion into pointer movement on a computer screen, providing smooth control over the graphical user interface.

Touchscreen: A touchscreen combines input and display functions in one device, with a touch panel overlaying an electronic visual display.

Software: Software is a set of programs and data that instruct a computer on specific tasks. It also includes relevant documentation. Unlike hardware, software dictates the system's functions.

Database: A database is a structured data collection managed by a database management system (DBMS), software that handles data input, analysis, and user interaction. The DBMS administers the database and associated applications, creating a cohesive database system. The term "database" can also refer to the DBMS, database system, or related application.

Open-source software: Open-source software (OSS) is computer software released under a license that grants users the rights to use, study, modify, and distribute the software and its source code freely. It is developed collaboratively and allows any capable user to participate in its development. The transparency of the code builds public trust in the software.

Spreadsheet: A spreadsheet is a computer application used for organizing and analyzing data in table format. It was developed as a digital version of paper accounting worksheets. It operates on data entered in cells, which can contain numbers, text, or formulas that automatically calculate and display values. The term may also refer to an electronic document.

Web browser: A web browser is a program that enables access to the internet and websites. It retrieves files from servers and displays web pages on screens. Browsers are used on various devices, with around 4.9 billion people estimated to have used one in 2020. Google Chrome dominates with a 65% global market share, followed by Safari with 18%.

Word processor: A word processor is a device or program for inputting, editing, formatting, and outputting text, often including extra features.

Operating system: An operating system (OS) is software that manages computer hardware and software resources, providing essential services for computer programs.

Computer file: A computer file is a data recording resource on a storage device, identified by its filename. It allows for sharing and transferring data between devices via various means like removable media, networks, or the Internet.

Barcode: Barcode: A visual, machine-readable representation of data using varying line widths, spacings, and sizes. Barcode readers can scan one-dimensional codes, consisting of parallel lines, using optical scanners.

File system: A file system is a method used by the operating system to organize and retrieve data. It divides data into manageable pieces called files, providing a structure and logic to manage these files. Without a file system, data would be one large entity, making it difficult to locate and retrieve specific information. The file system allows for easy isolation and identification of data by assigning names to each file. It operates similarly to a paper-based data management system.

Data storage: Data storage is the process of recording and storing information using various media such as handwriting, magnetic tape, and optical discs. It can also include biological molecules like RNA and DNA. Data can be recorded using different forms of energy, and electronic data storage requires electrical power.

Random-access memory: Random-access memory (RAM) is a type of computer memory that stores working data and machine code. It allows for quick and efficient reading and editing of data, regardless of its physical location within the memory. Unlike other storage media, RAM eliminates delays caused by mechanical limitations, ensuring near-instantaneous data access and manipulation.

Read-only memory: Read-only memory (ROM) is a non-volatile computer memory that cannot be modified once manufactured. It is used to store firmware, which is software that remains unchanged throughout the lifespan of a system. ROM is commonly distributed as plug-in cartridges for programmable devices.

Hard disk drive: A hard disk drive (HDD) is an electro-mechanical data storage device that uses magnetic storage to store and retrieve digital data. It has rapidly rotating platters coated with magnetic material, paired with magnetic heads that read and write data. HDDs provide random-access to data and retain stored information even when powered off. They are commonly found in small rectangular boxes.

Magnetic tape: Magnetic tape is a thin plastic film coated with a magnetizable substance, invented in Germany in 1928. It allows for easy recording and playback of audio, visual, and computer data.

Memory card: A memory card is a portable electronic data storage device that uses flash memory. It is commonly used in digital devices to add extra memory without the need for USB drives.

Optical disc: An optical disc is a flat object that stores information as physical variations on its surface. It can be read using a beam of light. Optical discs can be reflective or transmissive, depending on the position of the light source and detector.

Computer network: A computer network is a collection of computers sharing resources through digital connections. It utilizes different communication protocols and network technologies, including wired, optical, and wireless methods in various topologies.

Email: Email, or electronic mail, is a popular and widely used method of sending and receiving messages through electronic devices. It serves as a digital counterpart to traditional mail and has become an essential component in various aspects of daily life worldwide. An email address is now considered a basic requirement in business, commerce, government, education, entertainment, and other areas.

Ethernet: Ethernet is a wired computer networking technology widely used in LAN, MAN, and WAN. It was introduced commercially in 1980, standardized in 1983 as IEEE 802.3, and has evolved to support higher speeds, more nodes, and longer distances. Ethernet has largely replaced competing technologies like Token Ring, FDDI, and ARCNET in wired LANs.

Router (computing): A router is a networking device that directs data packets between computer networks, both within a network and on the internet. It ensures smooth traffic flow by forwarding packets from one router to another until they reach their destination.

Wi-Fi: Wi-Fi is a wireless network protocol that enables nearby devices to exchange data using radio waves. It allows internet access and device networking in various locations, including homes, offices, coffee shops, hotels, libraries, and airports. Wi-Fi is based on the widely used IEEE 802.11 family of standards.

Internet: The Internet is a global network of interconnected computer networks that communicate using the Internet protocol suite. It consists of various networks, including private, public, academic, business, and government networks, linked through different networking technologies. The Internet facilitates the exchange of a wide range of information resources and services, such as the World Wide Web, email, telephony, and file sharing.

HTML: HTML is the standard markup language for web content displayed in a browser. It defines the structure and content, often used with CSS for styling and JavaScript for interactivity.

HTTP: HTTP is a crucial protocol for the web, enabling data communication between distributed systems. It supports the World Wide Web by facilitating hypermedia information retrieval, allowing users to effortlessly access linked resources by clicking or tapping.

Internet protocol suite: The Internet protocol suite, also known as TCP/IP, is a set of communication protocols used in the Internet and computer networks. It includes essential protocols such as TCP, UDP, and IP. Originally funded by the US Department of Defense, it organizes protocols based on functionality.

Social media: Social media are interactive technologies that enable the sharing and aggregation of content and ideas through virtual communities and networks. It involves user-generated content and profiles created and maintained by the social media organization. Social media facilitates the development of online social networks by connecting users with others. It is a form of media that promotes interactive participation.

Search engine: A search engine is software that systematically searches the internet for specific information based on user queries. It presents search results, including web pages, images, videos, articles, and other files, in a line of results called search engine results pages (SERPs). Google dominates as the most widely used search engine globally, followed by Bing, Yahoo!, Baidu, Yandex, and DuckDuckGo.

Website: A website is a group of web pages with related content, all accessible through a common domain name and published on web servers. Websites focus on specific topics or purposes like news, education, commerce, entertainment, or social networking. Hyperlinks connect web pages and guide navigation, with most websites starting with a home page. Google Search, YouTube, Facebook, Twitter, and Instagram are currently the top five most visited websites as of May 2023.

World Wide Web: The World Wide Web is an information system for sharing content over the Internet, designed to be user-friendly for all. It allows access to documents and web resources through the Hypertext Transfer Protocol (HTTP).

Computer programming: Computer programming, also known as coding, is the creation of programs with instructions for computers to perform tasks. It involves writing code in programming languages, often high-level, to implement algorithms and procedures. Proficiency in programming requires knowledge of various subjects, including the application domain, programming languages, algorithms, and formal logic.

Character encoding: Character encoding is a system that assigns numbers to written characters, enabling their storage, transmission, and use in digital computers. These numerical values, called "code points", form a "code space" to represent characters in a computer.

Compiler: A compiler is a computer program that translates code from one programming language to another. It mainly converts high-level language to low-level language for creating an executable program.

Programming language: A programming language is a notation system for writing computer programs. It consists of key features essential for creating and communicating instructions to computers effectively.

Programming paradigm: A programming paradigm is a classification system for programming languages based on their characteristics. Different programming languages can belong to multiple paradigms.

Functional programming: Functional programming is a declarative programming paradigm that builds programs using functions instead of imperative statements. Functions are expressed as tree-like structures that transform values, rather than modifying program states.

Structured programming: Structured programming is a programming approach that emphasizes clarity, quality, and efficiency. It uses control flow constructs like selection and repetition, as well as block structures and subroutines, to enhance program development.

Object-oriented programming: Object-oriented programming (OOP) is a programming approach centered around objects, structures that store data (fields) and instructions (procedures).

Assembly language: Assembly language, often called assembly or ASM, is a low-level programming language that closely matches a computer's machine code. It typically has one statement per machine instruction, along with support for constants, comments, and symbolic labels.

C (programming language): C is a popular computer programming language developed in the 1970s by Dennis Ritchie. It is widely used and influential, with features that match the capabilities of targeted CPUs. It is commonly used in operating systems, device drivers, and protocol stacks, as well as on a wide range of computer architectures. While its usage in application software has decreased, it remains prevalent in various computing domains, from supercomputers to microcontrollers and embedded systems.

Java (programming language): Java is a versatile, object-oriented programming language known for its portability and ease of use. It allows programmers to write code once and run it on any platform that supports Java. Java applications are compiled into bytecode, which can be executed on any Java virtual machine. Its syntax is similar to C and C++, but with fewer low-level features. Additionally, Java offers dynamic capabilities not commonly found in compiled languages.

JavaScript: JavaScript, or JS, is a widely used programming language and a fundamental element of the web. It is employed alongside HTML and CSS to create interactive and dynamic webpages. Its extensive adoption by websites, around 98.7% as of 2023, empowers webpage behavior through client-side scripting. With support from all major web browsers, JavaScript executes code on users' devices. It also enables the integration of third-party libraries to enhance functionality.

Broadcasting: Broadcasting refers to the distribution of audio or video content to a wide audience using electronic mass communication, typically through the electromagnetic spectrum. It began with the popularity of AM radio in the 1920s, enabled by vacuum tube technology. Before this, electronic communication was mostly one-to-one. The term "broadcasting" originated from agricultural practices and was later used to describe widespread distribution of information through printed materials and telegraph. Early examples of "one-to-many" radio transmissions date back to 1898.

Communications satellite: A communications satellite is an artificial satellite that boosts and relays radio signals for various purposes such as television, telephone, internet, and military applications. Most are positioned in geostationary orbit, allowing ground stations to permanently aim their antennas at the satellite. Some satellites form constellations in low Earth orbit, requiring ground antennas to track and switch between satellites.

Cathode-ray tube: A cathode-ray tube (CRT) is a vacuum tube that emits electron beams to display images on a phosphorescent screen. It can show electrical waveforms, video frames, graphics, or radar targets. In TVs, it is called a picture tube. CRTs have also been used as memory devices. The term "cathode ray" initially described electron beams before their nature was fully understood.

Flat-panel display: A flat-panel display (FPD) is an electronic visual display found in various equipment like consumer products, medical devices, transportation systems, and industrial machinery.

Liquid-crystal display: An LCD is an electronic device that uses liquid crystals and polarizers to produce color or monochrome images. It can display arbitrary or fixed images, with the option to show or hide information. LCDs have small pixels for arbitrary images and larger elements for other displays. They can be normally on or off based on the polarizer arrangement. Character LCDs can have black lettering on a background matching the backlight color or a black background with letters of the same color as the backlight. Optical filters are used in white on blue LCDs for their distinctive look.

Image: An image is a visual representation that can be 2D or 3D. It can be displayed through various media and reproduced through photography or printmaking. Images can also be animated digitally or physically.

Image scanner: An image scanner, or simply scanner, is a device that captures images or text and converts them into digital format. It is commonly used in offices and comes in different types such as desktop flatbed scanners, handheld scanners, and mechanically driven scanners. These scanners have various applications including industrial design, reverse engineering, orthotics, and gaming.

Mail: Mail is a system for physically transporting postcards, letters, and parcels. It can be private or public, although governments often impose restrictions on private systems. National postal systems have become government monopolies since the 19th century, with prepaid fees. Adhesive postage stamps or postage meters are used for proof of payment, especially for bulk mailing.

Courier: A courier is an individual or company that transports messages, packages, or letters from one location or person to another. They usually provide their services through commercial contracts, though some couriers may work for government agencies.

Postage stamp: A postage stamp is a small paper issued by post officials or vendors to customers who pay postage. It is affixed to mail items and processed by the postal system. A postmark or cancellation mark is applied to prevent reuse. Finally, the mail is delivered to the recipient.

Printing: Printing is the process of mass reproducing text and images through a master form or template. It originated from ink rubbings on paper or cloth, evolving into pressing inked images onto paper. Important advancements include movable type (11th century) and the printing press (15th century), driving the Renaissance and Scientific Revolution. Printing has played a pivotal role in the spread of knowledge and the development of the modern knowledge-based economy.

Book: A book is a medium for recording information through writing or images, typically composed of many pages bound together with a protective cover. It can be fiction or nonfiction, handwritten or printed on paper, and is called a codex when bound. The codex replaced the scroll as a physical support for written compositions, with each page being a leaf.

Photocopier: A photocopier is a fast and affordable machine that duplicates images onto paper or film. It uses xerography, an electrostatic process, to transfer toner particles onto paper to create a copy. Heat or pressure fuses the toner onto the paper. While other technologies like inkjet can be used, xerography is the standard for office copying.

Printer (computing): A printer in computing is a peripheral device used to create permanent text or graphic representations on paper. It can produce outputs readable by humans and is available in various types such as inkjet, thermal, laser, and 3D printers.

Printing press: The printing press is a mechanical device that transfers ink from an inked surface to a print medium using pressure. It replaced the need for brushing or rubbing and sped up the printing process. This invention revolutionized the way texts were produced and had a significant impact on the world.

Radio: Radio is a technology that uses electromagnetic waves to transmit and receive signals. It operates within a frequency range of 3 Hz to 300 GHz. A transmitter connected to an antenna generates the waves, which are then received by another antenna connected to a radio receiver. This versatile technology is commonly used in radio communication, radar, navigation, remote control, sensing, and various other applications in modern times.

Amateur radio: Amateur radio, or ham radio, is the non-commercial use of radio frequencies for messaging, experimentation, training, recreation, contesting, and emergency communications. It is undertaken by authorized individuals with personal interests, distinct from commercial or professional radio services.

Radio broadcasting: Radio broadcasting is the transmission of audio and related data to the public through radio waves. It can be done through land-based stations or satellites. Listeners need a radio receiver to access the content. Stations often belong to a network that provides content in a common format. Different types of modulation are used, including AM, FM, and digital standards like DAB and HD radio. Television broadcasting also uses radio frequencies for transmitting video signals.

Sound recording and reproduction: Sound recording and reproduction is the process of capturing and recreating sound waves through electrical, mechanical, electronic, or digital means. It encompasses various forms of audio, like speech, singing, music, and sound effects. The main types of sound recording technology are analog and digital recording.

Loudspeaker: A loudspeaker is an electronic device that converts electrical signals into sound. It consists of a speaker driver, enclosure, and electrical connections. The driver acts as a linear motor, attached to a diaphragm that produces sound by moving air. By amplifying the audio signal, it reproduces the original sound. This is the opposite function of a microphone.

Microphone: A microphone, or mic, is a device that converts sound into an electrical signal. It is used in various applications such as telephones, public address systems, recording and broadcasting. Microphones are also present in electronic devices like computers and mobile phones for recording, speech recognition, and other purposes.

Speech synthesis: Speech synthesis is the creation of human-like speech by computer systems. These systems, known as speech synthesizers, can be implemented in software or hardware. They convert written text into spoken words, and can also interpret phonetic symbols. The opposite process, speech recognition, is also part of this field.

Telecommunications: Telecommunications is the transmission of information using different technologies such as wire, radio, or optical systems. It originated from the need for long-distance communication with similar efficiency to the human voice. Slow systems are not included in this field.

Modulation: Modulation is the process of changing properties of a carrier signal with another signal containing information, such as audio, video, or digital data, to be transmitted.

Telegraphy: Telegraphy is a method of long-distance message transmission that uses symbolic codes known to the recipient. It does not involve physical exchange of objects. Flag semaphore is an example of telegraphy, while pigeon post is not. Ancient signaling systems were limited in transmitting arbitrary text messages, as they relied on fixed and predetermined messages.

Telephone: A telephone is a device that allows people to talk to each other when they are far apart. It converts sound into electronic signals that are sent through cables to another telephone, where the sound is reproduced. The term 'telephone' comes from Greek words meaning distant voice. It is commonly referred to as a phone.

Mobile phone: A mobile phone is a portable telephone that allows calls over radio frequency while moving within a service area. It connects to a mobile phone operator's system and provides access to the telephone network. In North America, mobile phones are called cellphones due to their cellular network architecture. Besides making calls, modern mobile phones support various services like text messaging, email, internet access, and multimedia. They also offer features such as short-range wireless communication, satellite access, business applications, video games, and digital photography. Basic mobile phones are known as feature phones, while those with advanced computing capabilities are called smartphones.

Smartphone: A smartphone is a portable device that combines phone and computer features. It has a touchscreen, allowing access to applications, web browsing, email, social media, and multimedia. It includes a camera, GPS, and supports voice calls, text messaging, and internet-based messaging apps.

Text messaging: Text messaging is the sending of electronic messages containing letters and numbers between mobile devices or computers. Messages can be sent over cellular networks, satellites, or the Internet.

Television: Television (TV) is a medium that transmits moving images and sound. It includes television sets and transmission. It serves as a mass medium for advertising, entertainment, news, and sports.

Cable television: Cable television is a system that delivers television programming to consumers using RF signals through coaxial or fiber-optic cables. Unlike broadcast or satellite TV, it does not rely on over-the-air radio waves. Additionally, cable systems can also provide FM radio, high-speed internet, telephone services, and other non-TV services. Since the 2000s, cable has shifted from analog to digital operation.

Satellite television: Satellite television is a service that transmits TV programming from a satellite orbiting Earth to viewers. It uses a satellite dish and a low-noise block downconverter to receive signals, allowing viewers to access a wide range of channels.

Typewriter: A typewriter is a machine used for typing characters. It has keys that produce single characters on paper by striking an inked ribbon against it. The term 'typewriter' was applied to a person who used this device.

Video: Video is an electronic medium that records, plays, broadcasts, and displays moving visual media. It evolved from mechanical television to CRT and then flat-panel displays.

Video camera: A video camera is an instrument that captures videos, as opposed to a movie camera that uses film. Initially developed for television, video cameras are now widely used for various purposes.

ENIAC: ENIAC, completed in 1945, was the first programmable, electronic, general-purpose digital computer. It had all the key features of other computers combined in one, making it a Turing-complete machine capable of solving a wide range of numerical problems through reprogramming.

Android (operating system): Android is a mobile operating system developed by a group of developers called the Open Handset Alliance. It is based on a modified Linux kernel and is designed for touch-based devices like smartphones and tablets. The most popular version of Android is mainly developed by Google. It was introduced in November 2007 and the first Android device, the HTC Dream, was released in September 2008.

iOS: iOS is Apple's mobile operating system exclusively for iPhones. It is based on macOS and components of the Mach microkernel and FreeBSD, a Unix-like operating system. It was unveiled in January 2007 and launched in June 2007 alongside the first-generation iPhone.

MS-DOS: MS-DOS, developed by Microsoft, is an operating system for personal computers. It was widely used in the 1980s and gradually replaced by graphical user interface-based operating systems, like Microsoft Windows. The term "DOS" encompasses MS-DOS, its rebranding as IBM PC DOS, and other compatible systems.

Mac operating systems: Mac operating systems, created by Apple Inc., consist of two key families. These systems boast a range of notable features and functionalities.

Microsoft Windows: Microsoft Windows is a range of proprietary operating systems crafted by Microsoft, targeting specific sectors of computing. It encompasses Windows NT for desktops, Windows Server for servers, and Windows IoT for embedded systems. Notable predecessors like Windows 9x, Windows Mobile, Windows Phone, and Windows Embedded Compact are no longer active.

Unix: Unix is a multitasking, multi-user computer OS family that originated from AT&T Unix. Developed by Ken Thompson, Dennis Ritchie, and others at Bell Labs in 1969, Unix is known for its robustness and support for multiple users and tasks.

Linux: Linux is an open-source operating system family based on the Linux kernel, created by Linus Torvalds in 1991. It is commonly packaged as a Linux distribution, including the kernel, system software, and libraries. GNU software is also significant in Linux distributions, causing some debate over the naming convention.

YouTube: YouTube is a popular online video sharing and social media platform owned by Google. It was launched in 2005 by three former PayPal employees. With headquarters in California, it is the second most visited website globally. YouTube has over 2.5 billion monthly users, watching more than one billion hours of videos daily. The platform sees a rapid upload rate, with over 500 hours of content being added every minute.

Google: Google is a powerful American multinational technology company known for its artificial intelligence, search engine, online advertising, cloud computing, and consumer electronics. It is considered one of the most valuable brands and the most dominant player in the market, thanks to its advanced technology, data collection, and market dominance. Alphabet Inc. is its parent company, which is one of the Big Tech companies alongside Amazon, Apple, Meta, and Microsoft.

Wikipedia: Wikipedia is a free online encyclopedia written and maintained by a community of volunteers known as Wikipedians. It uses open collaboration and the MediaWiki editing system. As the largest and most-read reference work in history, Wikipedia consistently ranks among the top 10 most popular websites globally. Founded in 2001 by Jimmy Wales and Larry Sanger, it is hosted by the Wikimedia Foundation.

Facebook: Facebook is a social media and networking service owned by Meta Platforms. It was founded in 2004 by Mark Zuckerberg and his Harvard College roommates. Originally limited to Harvard, it expanded to other North American universities and now allows registration from age 13 or 14 in some countries. With 3 billion monthly users as of December 2022, Facebook is the 3rd most visited website globally, with a significant portion of traffic from the United States. Additionally, it was the most downloaded mobile app of the 2010s.

Electronics: Electronics is a scientific discipline that applies the principles of physics to design and operate devices manipulating electrically charged particles. It involves using active devices to control electric current flow and convert it between different forms. Electronics encompasses various subfields including microelectronics, nanoelectronics, optoelectronics, and quantum electronics, which focus on fabricating and applying electronic devices at different scales.

Circuit design: Circuit design is the process of creating electronic systems, from complex systems to individual transistors. Simple circuits can be designed by one person, while teams often use a systematic approach and computer simulation for more complex designs. In integrated circuit design automation, circuit design refers to the step that produces schematics, usually between logic and physical design.

Printed circuit board: A printed circuit board (PCB) is a medium used to connect components in a circuit. It consists of conductive and insulating layers, with copper traces etched onto them. Components are soldered onto the board, and interconnections are made through vias.

Amplifier: An amplifier, also known as an electronic amplifier or amp, is a device that increases the magnitude of a signal by using electric power from a power supply. It is a two-port electronic circuit that produces a larger amplitude signal at its output compared to the input signal. The level of amplification is measured by its gain, which is the ratio of output to input voltage, current, or power. Amplifiers are circuits with a power gain greater than one.

Vacuum tube: A vacuum tube is a device that controls electric current in a high vacuum between electrodes under an applied electric potential difference.

Capacitor: A capacitor is an electronic device that stores electrical energy by accumulating charges on two insulated surfaces. It is a passive component with two terminals.

Diode: A diode is an electronic component that conducts current in only one direction, with low resistance in that direction and high resistance in the opposite direction.

Light-emitting diode: LED: A semiconductor device that emits light when a current passes through it. Electrons and electron holes recombine in the semiconductor, producing photons. The color of the light is determined by the energy needed for electrons to cross the band gap. White light can be achieved by using multiple semiconductors or a phosphor layer on the device.

Electrical connector: An electrical connector is a device that connects different parts or circuits of an electrical system. It allows electric current to flow between them through a conductor. Connectors typically have a gender, with a male plug connecting to a female socket. They can be removable or permanent, and adapters can be used to connect different types of connectors.

Inductor: An inductor, also known as a coil or choke, is a passive electrical component that stores energy in a magnetic field when electric current flows through it. It is typically made up of an insulated wire wound into a coil.

Power supply: A power supply is an electrical device that converts electric current from a source into the correct voltage, current, and frequency for powering an electrical load. It is also known as an electric power converter. Power supplies can be separate standalone equipment or built into the appliances they power, like desktop computers and consumer electronics. They may also limit current, protect against electrical faults, condition power to prevent noise or surges, correct power factor, and store energy for temporary interruptions.

Resistor: A resistor is an electrical component used in circuits to control current flow and adjust voltage levels. It provides resistance to the flow of electricity and can be used for various purposes, including signal adjustment and voltage division. High-power resistors dissipate electrical power as heat and are used in motor controls, power systems, and as test loads. Fixed resistors have stable resistance, while variable resistors can be adjusted and used for sensing different aspects like heat, light, humidity, force, or chemical activity.

Switch: A switch is an electrical device used to interrupt or redirect an electric current in a circuit. It consists of movable electrical contacts connected to external circuits. When the contacts are touching, current flows, but when separated, current is interrupted.

Relay: A relay is an electrical switch with input and operating terminals. It can have various types of contacts, including make and break contacts.

Sensor: A sensor is a device that detects physical phenomena and generates an output signal.

Transformer: A transformer is a passive device that transfers electrical energy between different circuits without direct electrical connection. It uses a changing current in one coil to create a changing magnetic field in its core, generating a voltage in other coils around it. This principle, discovered by Faraday in 1831, allows for efficient electrical energy transfer.

Consumer electronics: Consumer electronics, also known as home electronics, are electronic devices used in private homes for entertainment, communication, and recreation. They are often referred to as black goods due to their dark casings, distinguishing them from white goods used for housekeeping tasks. In the past, brown goods was a term used in British English. Nowadays, consumer electronics stores sell a wide range of devices including appliances and light fixtures.

Remote control: A remote control is an electronic device that wirelessly operates another device from a distance. It is commonly used in consumer electronics to control devices like TVs and DVD players. Remote controls are primarily used for convenience, allowing operation of devices out of reach. They work best when used from a short distance and can even enable operation of devices that are otherwise unreachable, like garage door openers.

Semiconductor device: A semiconductor device is an electronic component that uses the properties of a semiconductor material. It has conductivity between conductors and insulators. These devices have replaced vacuum tubes and conduct electric current in the solid state, without the need for a vacuum or ionized gas.

Integrated circuit: An integrated circuit, or microchip, is a device with interconnected electronic components like transistors, resistors, and capacitors. It is made by etching these components onto a small piece of silicon. Integrated circuits are essential in computers, smartphones, and TVs to process and store information. They have revolutionized electronics by enabling smaller devices with enhanced functionality.

Charge-coupled device: A charge-coupled device (CCD) is an integrated circuit with linked capacitors that can transfer electric charge to each other. It is controlled by an external circuit and is primarily used in digital imaging technology.

Transistor: A transistor is a semiconductor device with three terminals that amplifies or switches electrical signals and power. It is a fundamental component of modern electronics, controlling current flow through its terminals. Transistors can amplify signals and are commonly found in integrated circuits. Considered one of the greatest inventions of the 20th century, they are vital to virtually all modern electronic devices.

Signal processing: Signal processing is an electrical engineering subfield that analyzes, modifies, and synthesizes signals like sound, images, and scientific measurements. It optimizes transmissions, enhances digital storage efficiency, corrects distorted signals, improves video quality, and identifies components of interest in measured signals.

Filter (signal processing): Filters are devices or processes used in signal processing to remove unwanted components or features from a signal. They suppress certain aspects of the signal, often by removing frequencies or frequency bands. Filters are used in various fields such as electronics, telecommunication, image processing, and control systems. They can act in domains other than frequency, and are essential in applications like audio recording, radar, computer graphics, and structural dynamics.

Signal-to-noise ratio: Signal-to-noise ratio (SNR) is a key measure in science and engineering that compares the intensity of a desired signal to the level of background noise. It is defined as the ratio of signal power to noise power and is often expressed in decibels. An SNR higher than 1:1 signifies a stronger signal compared to the background noise.

Oscilloscope: An oscilloscope is an electronic test instrument that shows the voltage of signals over time. It captures information for debugging, analysis, and characterization. The displayed waveform can be analyzed for properties like amplitude, frequency, and distortion. Older models required manual measurement, but modern ones can calculate and display these properties directly.

Antenna (radio): An antenna, also known as an aerial, is a crucial component in radio engineering that serves as the connection between radio waves and electrical currents. It enables the transmission and reception of electromagnetic waves, converting electric currents into waves for transmission and capturing radio wave power to generate electrical currents for reception. Antennas are integral in all radio equipment.

Waveguide: A waveguide is a structure that directs waves in a specific direction by limiting energy transmission. It includes various types like acoustic, optical, and radio-frequency waveguides, directing sound, light, and electromagnetic waves respectively.

Fire: Fire is the result of combustion, causing rapid oxidation of a material. It releases heat, light, and various reaction products. Flames, the visible part of a fire, primarily consist of carbon dioxide, water vapor, oxygen, and nitrogen. Under certain conditions, the gases may become ionized, forming plasma. The flame's color and intensity depend on the substances burning and any external impurities.

Renewable energy: Renewable energy refers to energy obtained from naturally replenished sources, such as sunlight, wind, water movement, and geothermal heat. While most renewable energy sources are sustainable, some biomass sources may be unsustainable. It is used for electricity generation, heating, and cooling, and is suitable for large-scale projects as well as rural areas and developing countries. Renewable energy plays a crucial role in human development.

Fuel: A fuel is a substance that can react with other materials to release energy as thermal energy or for work. Initially, it referred to materials with chemical energy, but now includes sources like nuclear energy.

Biofuel: Biofuel is a renewable fuel derived from biomass, produced quickly compared to fossil fuels. It can be made from plants, waste, or industrial byproducts. Primarily used for transportation, biofuels can also power heating and electricity. However, controversy arises from concerns over the "food vs fuel" debate, sustainability of production methods leading to deforestation and loss of biodiversity.

Charcoal: Charcoal is a black carbon residue created by heating wood with minimal oxygen to eliminate water and volatile elements. In the traditional method, called charcoal burning, heat is generated by burning a portion of the starting material. Charcoal can also be produced in a closed retort. Some modern charcoal briquettes used for outdoor cooking may include additional substances like coal.

Fossil fuel: Fossil fuels are hydrocarbons like coal, oil, and natural gas formed from dead plants and animals in the Earth's crust. They are extracted and burned for heat, power, and electricity generation. Some fuels are refined into kerosene, gasoline, and propane. These fuels originate from anaerobic decomposition of buried organisms over millions of years.

Coal: Coal is a black or brown sedimentary rock composed mainly of carbon. It forms in coal seams from decaying plant matter that is transformed into coal over millions of years. This fossil fuel was created by heat and pressure in wetlands known as coal forests during the late Carboniferous and Permian periods.

Natural gas: Natural gas is a mixture of hydrocarbons, primarily methane (97%), with small amounts of higher alkanes. It also contains trace gases like carbon dioxide, nitrogen, hydrogen sulfide, and helium. Methane is colorless and odorless, but contributes significantly to greenhouse gas emissions. To enhance safety, mercaptan odorizers are added to detect leaks easily.

Oil well: An oil well is a drillhole that extracts petroleum oil and releases associated natural gas. Gas wells extract only gas. Wells are created by drilling into oil or gas reserves and using extraction devices like pumpjacks. Drilling wells is costly, especially in hard-to-reach areas. Modern drilling techniques were developed in the 19th century and improved during the 20th century.

Oil refinery: An oil refinery is an industrial plant that transforms crude oil into useful products like gasoline, diesel fuel, and heating oil through a refining process. It can also produce petrochemical feedstock such as ethylene and propylene directly from crude oil. The refinery typically receives and stores crude oil as well as the final products in an oil depot. In 2020, global refineries had a total capacity of about 101.2 million barrels per day.

Gasoline: Gasoline is a flammable liquid commonly used as fuel for internal combustion engines. It is transparent, yellowish, and made from organic compounds obtained through the distillation of petroleum. Gasoline is also chemically enhanced with additives.

Kerosene: Kerosene, also known as paraffin, is a flammable liquid derived from petroleum. Used as a fuel in aviation and households, it was trademarked in 1854 by Abraham Gesner. Its name comes from the Greek word for "wax" and it is sometimes spelled as kerosine in scientific and industrial contexts.

Heating, ventilation, and air conditioning: HVAC, an abbreviation for Heating, Ventilation, and Air Conditioning, refers to a collection of technologies used to regulate temperature, humidity, and air purity in enclosed spaces. Its purpose is to achieve thermal comfort and maintain acceptable indoor air quality. HVAC system design is a specialized branch of mechanical engineering, grounded in principles of thermodynamics, fluid mechanics, and heat transfer. The field's abbreviation is often extended to include "Refrigeration" as HVAC&R or HVACR, and sometimes the "Ventilation" component is excluded, resulting in HACR.

Air conditioning: Air conditioning, or A/C, is the process of cooling and dehumidifying an enclosed space for a more comfortable environment. It can be achieved through mechanical air conditioners or other methods like passive cooling. Air conditioning is part of the HVAC family, which also includes heating and ventilation systems. Heat pumps are similar to A/C but can both heat and cool a space using a reversing valve.

Refrigeration: Refrigeration is the process of cooling a space or substance below the surrounding temperature, using artificial methods.

Candle: A candle is a wick immersed in wax or other flammable substance that produces light, fragrance, heat, and can be used to measure time.

Electric light: An electric light refers to an electrical component that emits light, commonly used for artificial lighting. It typically consists of a lamp with a base made of ceramic, metal, glass, or plastic, which is secured in a light fixture known as a "lamp." The connection to the fixture can be established through a screw-thread base, metal pins, metal caps, or a bayonet mount.

Incandescent light bulb: An incandescent light bulb is an electric light that uses a heated wire filament to produce light. It is enclosed in a glass bulb filled with inert gas or vacuum to prevent oxidation. The bulb is connected to a socket for mechanical support and electrical connections to supply current to the filament.

Power station: A power station, also known as a power plant, is an industrial facility that generates electric power. It is connected to an electrical grid.

Electric generator: An electric generator converts mechanical or fuel-based power into electric power for use in circuits. It can be powered by turbines, engines, wind, or even manual cranks. The first electromagnetic generator, invented in 1831 by Michael Faraday, paved the way for modern generators. They are crucial for supplying power to electrical grids.

Electricity generation: Electricity generation is the process of producing electric power from primary energy sources. It occurs before delivery to end users or storage in the electric power industry.

Hydropower: Hydropower, or water power, harnesses the energy of falling or fast-running water to generate electricity or power machinery. It converts the gravitational potential or kinetic energy of water sources into sustainable power, mainly through hydroelectric power generation. It is also used in pumped-storage hydroelectricity systems for energy storage.

Hydroelectricity: Hydroelectricity is generated from hydropower and supplies about one sixth of the world's electricity, more than all other renewables and nuclear power combined. It provides large amounts of low-carbon electricity on demand, contributing to secure and clean energy systems. Hydroelectric power stations with dams and reservoirs offer flexibility in adjusting electricity production quickly. They produce no direct waste and emit significantly fewer greenhouse gases than fossil fuel plants. However, when built in lowland rainforest areas, emissions may increase due to forest inundation.

Watermill: A watermill is a structure that uses hydropower to drive a mechanical process, such as milling, rolling, or hammering. It utilizes a water wheel or turbine to produce various material goods like flour, lumber, paper, textiles, and metal products. Watermills can be gristmills, sawmills, paper mills, textile mills, hammermills, trip hammering mills, rolling mills, or wire drawing mills.

Nuclear power: Nuclear power utilizes nuclear reactions to generate electricity, primarily through nuclear fission of uranium and plutonium in power plants. Additional sources include nuclear decay and the ongoing research on nuclear fusion. It has niche applications like radioisotope thermoelectric generators in space probes. Fusion power remains the subject of international research and focus.

Solar energy: Solar energy is the use of sunlight to create electricity and heat. It is a renewable energy source and can be captured through various technologies. These include solar power, which converts sunlight into electricity, and solar thermal energy, which heats water. The use of solar energy can be categorized as either passive or active, depending on how it is harnessed. Passive techniques involve designing buildings to optimize sunlight and airflow, while active techniques use systems like photovoltaic panels and concentrated solar power.

Solar power: Solar power is the process of converting sunlight into electricity using photovoltaic cells or concentrated solar power. Photovoltaic cells directly convert light into electric current, while concentrated solar power systems use lenses or mirrors to focus sunlight onto a hot spot, typically to power a steam turbine.

Solar cell: A solar cell is an electronic device that generates electricity from light using the photovoltaic effect. It is a type of photoelectric cell that converts the energy of light directly into electricity. Solar cells are commonly used in photovoltaic panels, with the most common type producing around 0.5 to 0.6 volts of open-circuit voltage.

Cooling tower: A cooling tower is a device that cools a stream of water or coolant by either using water evaporation or relying solely on air to remove heat. It helps reject waste heat and lowers the temperature of the working fluid.

Geothermal power: Geothermal power is electricity produced from geothermal energy, utilizing methods like dry steam, flash steam, and binary cycle power stations. It is utilized for electricity generation in 26 countries and for heating purposes in 70 countries.

Turbine: A turbine is a mechanical device that converts fluid flow energy into useful work, like generating electricity. It has a rotor assembly with blades that, when fluid passes through, results in rotational energy. Examples include windmills and waterwheels.

Gas turbine: A gas turbine, also known as a gas turbine engine, is a continuous flow internal combustion engine. Its main components include a rotating gas compressor, a combustor, and a compressor-driving turbine.

Steam turbine: A steam turbine is a machine that uses pressurized steam to generate mechanical energy. It was invented by Charles Parsons in 1884 and has since evolved with advanced metalwork and precision parts. Steam turbines play a crucial role in the energy economics of the 21st century.

Wind turbine: A wind turbine converts wind energy into electricity. Wind farms have hundreds of thousands of turbines, generating over 650 gigawatts of power and growing by 60 GW each year. Wind turbines are vital for renewable energy, reducing costs and reliance on fossil fuels. A study found wind to have the lowest greenhouse gas emissions, least water consumption, and positive social impacts compared to other energy sources like solar, hydro, coal, and gas.

Wind power: Wind power is the harnessing of wind energy to generate useful work, primarily electricity. It historically powered sails, windmills, and windpumps. Nowadays, wind turbines in wind farms are the main source, connected to the grid for electricity generation.

Windmill: A windmill is a structure that utilizes wind power to generate rotational energy. It consists of sails or blades that convert wind energy into useful work, predominantly grinding grain in traditional gristmills. The term "windmill" has also been broadened to include windpumps, wind turbines, and other applications. Additionally, such devices are sometimes referred to as "wind engines."

Electric battery: An electric battery is a power source made up of one or more electrochemical cells, used to power electrical devices. It has a positive terminal known as the cathode, a negative terminal called the anode, and supplies electrons to flow through an external circuit. When connected to an electric load, a redox reaction converts high-energy substances into lower-energy ones, delivering the energy difference to the external circuit. Originally, a battery referred to multiple cells, but now it includes devices with a single cell.

Electric power transmission: Electric power transmission is the transmission of electrical energy from power plants to substations, forming a network. It is different from distribution, which is the wiring to customers. This network connects with distribution to create the electrical grid for electricity delivery.

Electric power distribution: Electric power distribution is the final stage of delivering electricity from the transmission system to consumers. It involves the use of distribution substations and transformers to lower the voltage for residential and commercial use. Primary distribution lines carry power to distribution transformers near customers' premises, while secondary distribution lines connect multiple customers to one transformer. Larger power consumers may be connected directly to higher distribution levels.

Electrical grid: An electrical grid is a network that delivers electricity from producers to consumers through power stations, substations, transmission lines, and distribution systems. It varies in size and can cover entire countries or continents, and includes microgrids, synchronous grids, and super grids.

Electrical wiring: Electrical wiring is the installation of cables, switches, sockets, and other devices used for electricity distribution in buildings or structures.

Electrical cable: An electrical cable is a conductor made up of several wires bundled together. It is used to carry electric current. Cable assemblies, such as cable trees or cable harnesses, are used to connect multiple terminals together.

Circuit breaker: A circuit breaker is an electrical safety device that interrupts current flow to prevent damage from overcurrent, protecting equipment and reducing fire risk. Unlike a fuse, it can be reset for normal operation without replacement.

Fuse (electrical): A fuse is an electrical safety device used in electronics and electrical engineering. It contains a metal wire or strip that melts when there is an excess flow of current, cutting off the circuit. Once a fuse has operated, it needs to be replaced or rewired.

Factory: A factory is an industrial facility with machinery where workers manufacture or process items. They are crucial for modern production, with most goods globally being produced or processed within factories.

Assembly line: An assembly line is a manufacturing process where parts are added sequentially as the semi-finished assembly moves between workstations. By mechanizing the movement of parts and assemblies, products can be assembled more efficiently and with reduced labor compared to manually carrying parts to a stationary location for assembly.

Automation: Automation is the use of technology to decrease human involvement in processes, achieving this by predetermined decision criteria and actions implemented in machines. Various methods are employed, including mechanical, electrical, and electronic devices, as well as computers. Complex systems like factories, airplanes, and ships combine these techniques. Automation brings advantages such as reducing labor, waste, electricity and material costs, while also enhancing quality, accuracy, and precision.

Industrial robot: An industrial robot is an automated and programmable system used in manufacturing. It is capable of moving on three or more axes.

Interchangeable parts: Interchangeable parts are nearly identical components that can be freely replaced in an assembly without custom fitting. They allow easy assembly and repair of devices, minimizing the time and skill required for the task.

Mass production: Mass production is the efficient manufacturing of large quantities of standardized products in a continuous flow, typically on assembly lines. It is one of the three main production methods, alongside job production and batch production.

Mechanization: Mechanization is the transition from manual or animal labor to the use of machinery. Machines are designed to perform specific mechanical operations by utilizing a moving power and facilitating the completion of work tasks. They serve as a link between the power source and the desired operations, allowing for efficient adaptation and performance.

Standardization: Standardization is the establishment of technical standards through consensus among various parties, including firms, users, interest groups, governments, and standards organizations. Its goal is to enhance compatibility, interoperability, safety, repeatability, and quality. Additionally, it enables the normalization of previous custom practices.

Waste: Waste refers to undesirable or inoperable materials that are discarded after being used. It can be a substance of no worth or usefulness. In contrast, a by-product is a less valuable joint product. However, a waste product can potentially be transformed into a by-product, joint product, or resource if its value is increased through innovation.

Landfill: A landfill is a designated site for the disposal of waste materials. It has various names like dump, garbage dump, or trash dump. This method has been widely used for waste disposal since ancient times, but systematic burial with covers started in the 1940s. Previously, waste was left in piles or pits, which is known as a midden in archeology.

Recycling: Recycling is the conversion of waste materials into new objects and materials, including energy recovery. It helps save materials, lowers greenhouse gas emissions, and prevents waste of useful materials. Additionally, recycling reduces consumption of raw materials, energy use, air pollution, and water pollution.

Waste management: Waste management involves the various steps taken to handle and dispose of waste properly. It encompasses collecting, transporting, treating, and disposing of waste, while also monitoring and regulating the entire process. This field encompasses laws, technologies, and economic mechanisms related to waste.

Bleach: Bleach is a chemical used to remove color from fabric and fibers or disinfect after cleaning. It typically refers to a diluted solution of sodium hypochlorite, known as "liquid bleach."

Desalination: Desalination is a process that removes minerals from saline water, making it suitable for human consumption and irrigation. It is also used on ships and submarines. The by-product of the process is brine. Desalination is an important method for providing fresh water, especially in areas with limited rainfall.

Detergent: Detergent is a cleansing agent that contains surfactants. It is available in various forms and commonly includes alkylbenzene sulfonates, which are soap-like compounds. These compounds are highly soluble in hard water, as their polar sulfonate components are less likely to bind to calcium and other ions present in hard water.

Laundry: Laundry is the process of washing, drying, and ironing clothes and textiles. It has been practiced throughout history as clothing became a commonplace. Scholars find interest in studying the various methods cultures use to address this universal human need.

Pasteurization: Pasteurization is a method of preserving food by subjecting it to mild heat treatment below 100°C, eliminating harmful microorganisms and extending its shelf life. This process destroys or deactivates bacteria and enzymes that cause spoilage and disease, although bacterial spores may still survive.

Sanitation: Sanitation refers to efforts to maintain public health by ensuring clean drinking water, proper disposal of human waste, and preventing the spread of disease through feces. Adequate sanitation can help reduce malnutrition, stunted growth in children, and the transmission of various diseases like cholera, hepatitis, and polio.

Sanitary sewer: A sanitary sewer is an underground system that transports sewage from buildings to a treatment plant. It is part of a larger sewage system and may also carry industrial wastewater. Sanitary sewers prevent combined sewer overflows and are smaller than sewers that transport runoff. However, backups can occur due to aging infrastructure and leaks.

Sewage treatment: Sewage treatment is a process that removes contaminants from wastewater to make it safe for release into the environment or for reuse. It addresses wastewater from homes, businesses, and industries, including stormwater from urban areas. The process involves primary and secondary treatment stages, with the option of advanced tertiary treatment for further purification and nutrient removal. Some systems also incorporate a quarternary treatment step to eliminate organic micropollutants. Different types of sewage treatment processes exist, ranging from decentralized to large centralized systems. Sweden has implemented a comprehensive treatment approach that includes all these stages.

Water purification: Water purification is the process of removing chemicals, contaminants, solids, and gases from water to make it safe for specific purposes. It is mainly done for human consumption but also for medical, chemical, and industrial applications. The history of water purification includes various methods like filtration, sedimentation, distillation, slow sand filters, biologically active carbon, flocculation, chlorination, and ultraviolet light treatment.

Soap: Soap is a fatty acid salt utilized in various cleaning and lubricating products. It is a surfactant used in domestic chores like washing and bathing, while in industries it serves as thickeners, catalysts, and a component in lubricants.

Water supply network: A water supply network is an engineered system that provides water supply. It includes raw water collection points, water purification facilities, and water storage facilities. There are also pressurizing components and a pipe network for distributing water to consumers. The sewer system is separate from the water supply system.

Aqueduct (water supply): An aqueduct is a watercourse constructed to transport water from a source to a distant distribution point. It can be comprised of various structures such as pipes, ditches, canals, tunnels, and bridges. Aqueducts were historically used in ancient civilizations like Greece, the Near East, and Rome. They ranged from simple ditches to large channels, sometimes passing through tunnels. Modern aqueducts may utilize pipelines. Their main purposes were to provide irrigation for crops and supply drinking water to large cities.

Qanat: A qanat, also known as kārīz, is an ancient underground aqueduct system that transports water from wells to the surface. It originated in what is now Iran around 3,000 years ago. Similar systems exist in North Africa and the Middle East, with regional names like foggara, khettara, falaj, karez, and 'uyūn. The largest functioning qanat systems can be found in Iran, Afghanistan, Oman, Turfan in China, Algeria, and Pakistan.

Pumping station: Pumping stations, or pumphouses, are facilities with pumps and equipment used to move fluids from one location to another. They play a vital role in various infrastructure systems, including water supply to canals, drainage of low-lying areas, and sewage removal. Additionally, pumping stations are essential components in pumped-storage hydroelectricity installations.

Water tower: A water tower is a tall structure that holds a water tank at an elevated position to provide pressurized water for distribution and emergency fire storage. It can work with underground or surface reservoirs for treated water, but some towers solely store non-potable water for fire protection or industrial use, not connected to public water supply.

Well: A well is a structure dug or drilled into the ground to access liquid resources, especially water. The most common type is a water well, used to tap into underground aquifers. Water is extracted with pumps or manually using containers. Wells can also be used to inject water back into aquifers. They have been constructed for at least eight thousand years, varying in complexity from simple scoops to intricate systems like qanats in Iran and stepwells in India. Adding a lining to the well shaft enhances stability, with wooden or wickerwork linings dating back to the Iron Age.

Abrasive: An abrasive is a mineral material used to shape or finish a workpiece by rubbing, causing friction that wears away part of the workpiece. It can involve polishing for a smooth surface or roughening for satin, matte, or beaded finishes. Ceramics used to cut, grind, and polish softer materials are called abrasives.

Pottery: Pottery is the art of creating durable vessels and objects from clay and other materials, through a high-temperature firing process. It encompasses a wide range of uses such as tableware, decorations, and industrial applications like electrical insulators. The term also refers to the place where these items are made. In the context of art history and archaeology, pottery usually refers to vessels while figurines made from the same material are known as terracottas.

Ceramic: Ceramic is a material created by shaping and firing inorganic, nonmetallic substances like clay at high temperatures. It is known for its hardness, brittleness, heat resistance, and corrosion resistance. Popular examples include earthenware, porcelain, and brick.

Porcelain: Porcelain is a strong and translucent ceramic material created by heating raw materials in a kiln at high temperatures. Its superior quality comes from vitrification and the formation of mullite. Porcelain is commonly used in tableware, decorative items, technology, industry, and scientific purposes.

Leather: Leather is a durable material obtained from animal hides, preventing decay through tanning. It is flexible, strong, and commonly sourced from various animals including cattle, sheep, goats, horses, buffaloes, pigs, and aquatic creatures like seals and alligators.

Parchment: Parchment is a writing material made from untanned animal skins, like sheep, calves, and goats. It has been used for over 2000 years and is a popular medium for writing. Vellum, a higher quality parchment, is made from the skins of young animals such as lambs and young calves.

Natural rubber: Natural rubber, also known as India rubber or latex, is a polymer made from the organic compound isoprene. It is produced with small amounts of impurities and is mainly cultivated in Thailand, Malaysia, Indonesia, and Cambodia.

Paper: Paper is a thin sheet material made from cellulose fibers derived from plants. It is produced through a process involving water, mesh, pressing, and drying. Originally made by hand, it is now manufactured on large machines at high speeds. Paper is versatile, used for printing, packaging, writing, and more. It also has various industrial applications, such as in filtering, construction, and currency production.

Papyrus: Papyrus is a durable paper-like material used in ancient times for writing. It was derived from the pith of the papyrus plant and often formed into scrolls, serving as an early type of book.

Plastic: Plastic is a versatile material made mostly from polymers. It can be easily shaped and has many useful properties, including being lightweight, strong, flexible, and cheap to produce. Plastics are commonly derived from fossil fuels, but can now be made from renewable sources like corn and cotton.

Glass: Glass is a clear, hard substance with no crystal structure. It is chemically stable and commonly used for windows, dishes, and lenses.

Adhesive: An adhesive is a substance, also known as glue, that is applied to the surfaces of two separate items to bind them together and prevent separation. It is a non-metallic substance like cement, mucilage, or paste.

Chemical plant: A chemical plant is an industrial facility that produces chemicals on a large scale. Its main goal is to create material wealth through the transformation and separation of substances. Chemical plants employ specialized equipment and technology. They share similarities with polymer, pharmaceutical, food, and beverage production facilities, power plants, refineries, natural gas processing, and wastewater treatment plants. Some may consider oil refineries, pharmaceutical, and polymer manufacturers as types of chemical plants.

Composite material: A composite material is created by combining two or more materials with different properties to form a new material with unique characteristics. Unlike mixtures or solid solutions, the original materials in composites remain separate within the final structure.

Explosive: An explosive is a highly reactive substance with immense potential energy. When released suddenly, it can cause an explosion, generating light, heat, sound, and pressure. It can be either a single ingredient or a mixture of at least two substances.

Dynamite: Dynamite, invented by Alfred Nobel, is an explosive that combines nitroglycerin, sorbents, and stabilizers. Patented in 1867, it quickly became popular as a safer substitute for black powder explosives. Its key advantage lies in harnessing nitroglycerin's explosive power while minimizing the risk of accidental detonation.

Fireworks: Fireworks are low explosive pyrotechnic devices used for entertainment. They create dazzling displays in outdoor settings and are central to cultural and religious celebrations. However, mishandling can lead to fireworks accidents.

Petrochemical: Petrochemicals are chemical products derived from refining petroleum. They can also be made from coal, natural gas, or renewable sources like maize, palm fruit, or sugar cane.

Metallurgy: Metallurgy is a branch of materials science and engineering that examines the properties and behavior of metals, metal compounds, and alloys through their physical and chemical characteristics.

Smelting: Smelting is a metallurgical process that uses heat and a reducing agent to extract base metals from ores. It is commonly used to obtain metals like iron, copper, silver, tin, lead, and zinc. By applying heat and a reducing agent, the ore is decomposed, releasing gases or slag and leaving behind the desired metal. Fossil fuels, like carbon monoxide from coke combustion, are typically used as the reducing agent. The oxygen in the ore binds to carbon, resulting in the formation of carbon dioxide.

Metalworking: Metalworking is the practice of shaping metals to make useful objects, from small engine parts to massive structures like ships and bridges. It involves a range of processes, skills, and tools, and is used to create objects of all sizes.

Die casting: Die casting is a metal casting process where molten metal is forced under pressure into a mold cavity. The mold cavity is created using hardened steel dies that shape the metal similar to an injection mold. It is commonly used for non-ferrous metals like zinc, copper, aluminium, magnesium, lead, pewter, and tin-based alloys. The choice of machine, hot or cold-chamber, depends on the type of metal being cast.

Wire: A wire is a flexible metal bar used for various purposes.

Extrusion: Extrusion is a manufacturing process that pushes material through a die to create objects with specific cross-sectional profiles. It offers advantages such as the ability to create complex shapes and work with brittle materials by subjecting them to compressive and shear stresses. Additionally, it provides excellent surface finish and allows for design freedom.

Forging: Forging is a metal shaping process using localized compressive forces, typically with a hammer or die. It can be categorized into cold, warm, or hot forging based on the temperature. Forged parts vary in weight from less than a kilogram to hundreds of metric tons. This ancient technique has been used by smiths to create a wide range of products, including kitchenware, hardware, tools, weapons, cymbals, and jewelry.

Heat treating: Heat treating is an industrial process in which the physical and chemical properties of a material, usually metal, are changed through the use of extreme temperatures. The most common application is in metallurgy, but heat treatments are also used in the production of other materials. These treatments involve heating or chilling to achieve desired outcomes like hardening or softening. Various techniques such as annealing, case hardening, and quenching are employed. While heat treatments are intentional processes, heating and cooling may also occur incidentally during other manufacturing methods.

Laser cutting: Laser cutting is a technology that uses a powerful laser to vaporize materials, resulting in precise and clean cuts. Originally used for industrial purposes, laser cutting is now widely adopted by schools, small businesses, architecture, and hobbyists. The process involves directing the laser beam through optics and CNC systems to follow a pattern. The laser beam melts, burns, or vaporizes the material, leaving a high-quality finished edge.

Rolling (metalworking): Rolling is a metalworking process that involves passing metal stock through rolls to reduce thickness and create uniformity. It can be classified as hot or cold rolling depending on the metal's temperature. Hot rolling is used more extensively and cold rolling is the primary cold working process. Rolling mills are used to quickly transform steel into various products like structural steel and bar stock. Steel mills often have rolling mill divisions to convert semi-finished casting products into finished goods.

Soldering: Soldering is a method of connecting metal surfaces using a filler metal known as solder. It involves heating the surfaces, melting the solder, and allowing it to cool to create a strong and durable bond.

Steelmaking: Steelmaking is the production of steel through the processing of iron ore and/or scrap. It involves the removal of impurities, such as nitrogen, silicon, phosphorus, sulfur, and excess carbon, from iron. Additionally, alloying elements like manganese, nickel, chromium, carbon, and vanadium are added to create various steel grades.

Welding: Welding is a fabrication process that uses high heat to melt materials like metals and thermoplastics, joining them together and allowing them to fuse upon cooling. It differs from brazing and soldering as it involves melting the base metal.

Textile: Textiles are fiber-based materials, including fibers, yarns, filaments, threads, and different fabric types. Initially, textiles were limited to woven fabrics, but later, other methods like knitting and non-woven were developed. Textiles now cater to diverse applications, ranging from everyday clothing to specialized items like bulletproof jackets, spacesuits, and doctor's gowns.

Canvas: Canvas is a strong and durable woven fabric widely utilized for creating various items that require sturdiness, like sails, tents, backpacks, and shelters. It is also commonly employed as a surface for oil paintings by artists, often stretched over a wooden frame. Additionally, canvas finds application in fashion objects such as handbags, electronic device cases, and shoes.

Cotton: Cotton is a soft and fluffy fiber that grows around the seeds of cotton plants. It primarily consists of cellulose and may contain small amounts of other substances. Cotton bolls help disperse the seeds naturally.

Felt: Felt is a dense textile made by matting fibers together. It can be produced from natural materials like wool or fur, or synthetic fibers such as acrylic or rayon. Felt possesses unique characteristics like fire-resistance, vibration dampening, sound absorption, and high fluid absorption capacity without feeling wet. Its versatility makes it suitable for various applications.

Fiber: Fiber refers to elongated materials that are used in making various products. It can be natural or man-made and is widely used in manufacturing. Strong engineering materials such as carbon fiber and ultra-high-molecular-weight polyethylene commonly include fibers.

Jute: Jute is a strong bast fiber derived from the Corchorus plant in the Malvaceae family. It can be spun into coarse threads and is known for its rough texture and shiny appearance. Corchorus capsularis is the preferred source of jute fiber, while Corchorus olitorius is considered inferior.

Lace: Lace is a delicate fabric made of yarn or thread in an open weblike pattern, created by machine or by hand. It can be categorized into needlelace and bobbin lace, with other types including knitted or crocheted lace. This article discusses both needle lace and bobbin lace.

Linen: Linen is a textile derived from flax plant fibers.

Polyester: Polyester is a type of polymer that contains the ester functional group in each repeat unit of its main chain. It commonly refers to polyethylene terephthalate (PET), a specific material. Polyester includes both natural chemicals found in plants and insects and synthetic variations like polybutyrate. While some polyesters are biodegradable, most synthetic ones are not. This versatile material is widely used in clothing production.

Silk: Silk is a natural protein fiber that can be woven into textiles. It is mainly composed of fibroin and produced by insect larvae to form cocoons. The most well-known type of silk comes from the larvae of the mulberry silkworm, which is reared in captivity. The shimmering appearance of silk is a result of its unique triangular prism-like structure, allowing it to reflect light at different angles and produce various colors.

Thread (yarn): A thread is a long strand used to join, create or decorate fabrics. It can be composed of various materials such as plant fibers, wool, hair, cotton, linen, nylon, silk, polyester, and even metal wire. Ancient Egyptians were skilled at making thread from natural fibers.

Wool: Wool is a textile fiber derived from animals like sheep, goats, rabbits, and camelids. It can also apply to mineral and glass materials that share wool-like properties.

Yarn: Yarn is a continuous length of interlocked fibers used in sewing, knitting, weaving, and more. It can be made of natural or synthetic materials, and comes in various colors and thicknesses. Thread, a type of yarn, is used for sewing by hand or machine and may be finished with wax for added strength. Embroidery threads are specifically designed for needlework. While yarn can be dyed different colors, most are solid colored with a uniform hue.

Basket weaving: Basket weaving is the art of crafting three-dimensional objects by weaving pliable materials like mats, bags, and furniture. Those skilled in this craft are called basket makers or weavers. Often practiced in rural areas, basket weaving is a traditional and specialized form of craftsmanship.

Crochet: Crochet is a textile creation process using a crochet hook to interlock loops of various materials. The name comes from the French term for 'hook'. Hooks can be made of different materials. In crochet, each stitch is completed before starting the next one, unlike knitting. Variants like Tunisian crochet and broomstick lace allow multiple stitches to remain open simultaneously.

Dyeing: Dyeing is the process of applying dyes or pigments to fibers, yarns, and fabrics to achieve desired colors that are long-lasting. It involves using a special solution containing dyes and chemicals, and the dye molecules are attached to the fiber through absorption, diffusion, or bonding. Dyeing differs from printing as it covers the entire textile, while printing applies color to specific areas with patterns.

Dye: A dye is a colored substance that chemically binds to a material, distinguishing it from pigments. It is typically applied in a water-based solution and may require a mordant to enhance its durability on fibers.

Embroidery: Embroidery is a needlecraft that involves decorating fabric or materials with thread or yarn. It can also include pearls, beads, quills, and sequins. Embroidery is commonly found on various items like caps, coats, dresses, and more. It offers a wide range of thread or yarn colors and is often used for personalized gifts or clothing.

Knitting: Knitting is a technique that produces fabric by interlacing yarn loops. It is used for creating various types of clothing and can be done either by hand or by machine.

Macramé: Macramé is a textile art created by knotting techniques.

Quilting: Quilting refers to joining layers of fabric using stitching by hand or machine. This creates a padded surface with a three-dimensional effect. The three layers involved are the top fabric, insulating material, and backing.

Sewing: Sewing is the craft of attaching objects with stitches using a needle and thread. It is one of the oldest textile arts, dating back to the Paleolithic era. Stone Age people in Europe and Asia sewed fur and leather clothing with bone or ivory needles and threads made of animal sinew, catgut, and veins.

Hand spinning: Hand spinning is the ancient art of twisting fibers together to create yarn. Initially done by hand with tools like the spindle and distaff, it saw a significant improvement with the invention of the spinning wheel in the 11th century. This led to increased productivity and eventually mass production during the Industrial Revolution in the 18th century. Despite technological advancements, hand spinning continues to be a beloved handicraft.

Loom: A loom is a device to weave cloth and tapestry. It holds the warp threads under tension for weaving the weft threads. Its shape and mechanics may vary, but its purpose remains constant.

Weaving: Weaving is a textile production method where two sets of yarns or threads intertwine at right angles to create cloth. The warp threads run lengthwise, while the weft threads run widthwise. This interlacing affects the cloth's characteristics. Looms are commonly used to weave cloth, but alternative techniques like tablet weaving and back strap loom can also produce fabric.

Tapestry: Tapestry is a hand-woven textile art used for creating images. It is delicate and challenging to make, leading to its historical use as wall hangings or furniture covers. Some periods produced smaller pieces as decorative borders. Commonly, natural warp threads like wool, linen, or cotton are used, while weft threads can be wool, cotton, silk, or metallic materials.

Building: A building is a permanent, enclosed structure with walls and a roof, such as a house or factory. It comes in various sizes, shapes, and functions, and is shaped by factors like materials, weather conditions, land prices, and specific uses. Nonbuilding structures can be studied for comparison.

Infrastructure: Infrastructure refers to the facilities and systems that support a country, city or area. It includes public and private structures like roads, bridges, water supply, electrical grids, and telecommunications. Its main purpose is to enable economic activities and daily living by providing essential services. Infrastructure also plays a crucial role in maintaining the environment.

Brick: Brick: a construction material for walls and pavements made primarily of clay but can also be made of other materials. Joined using mortar, adhesives, or interlocking. Produced in various classes, types, materials, and sizes at brickworks in large quantities.

Cement: Cement is a chemical binder used in construction to bind materials together. It sets, hardens, and adheres to other substances. It is commonly mixed with sand and gravel to produce concrete, which is the planet's second most-consumed resource after water.

Concrete: Concrete is a widely used composite material made from aggregate and cement. It cures over time and is the most commonly used building material globally. Its usage ton for ton is double that of steel, wood, plastics, and aluminum combined.

Masonry: Masonry is the art of constructing structures using materials like brick, stone, and mortar. It involves bonding and joining these materials together, and can also refer to the actual building components.

Quarry: A quarry is an open-pit mine where materials like stone, rock, sand, or gravel are excavated. Regulations exist in certain places to ensure safety and minimize environmental impact of quarry operations.

Scaffolding: Scaffolding, also known as scaffold or staging, is a temporary structure used to support work crews and materials during the construction, maintenance, and repair of various human-made structures. It provides access to heights and difficult-to-reach areas. However, unsafe scaffolding can lead to fatal accidents. Besides construction, it is also utilized for formwork, shoring, seating, concert stages, towers, exhibition stands, ski ramps, half pipes, and artistic projects.

Wood: Wood is a structural tissue found in trees and plants. It consists of strong cellulose fibers embedded in lignin, resisting compression. It supports growth and transfers water and nutrients. Wood can refer to similar tissues in roots and shrubs, as well as engineered materials made from wood and fibers.

Lumber: Lumber is processed wood used for construction and finishing, available in different sizes and referred to as timber in some countries. It has diverse applications beyond home building and is often called timber in other regions to refer to unprocessed wood fiber.

Woodworking: Woodworking is the craft of creating wooden objects, encompassing various disciplines like cabinetry, furniture making, wood carving, joinery, carpentry, and woodturning.

Carpentry: Carpentry is a skilled trade involving the cutting, shaping, and installation of building materials. It has traditionally used natural wood, but now includes other materials and fine trades like cabinetmaking. In the US, the majority of carpenters are male, and in 2006 there were about 1.5 million carpentry positions. Carpenters are often the first and last workers on a job, and historically framed post-and-beam buildings. They learn through apprenticeships or work experience.

Arch: An arch is a curved vertical structure that spans an open space, offering support or decoration. It originated in the fourth millennium BC, but gained popularity during the Roman era in the 4th century BC.

Ceiling: A ceiling is an overhead surface inside a room that covers the upper part. It is not a structural element but conceals the roof structure or upper floor. Ceilings can be decorated with frescoes and artwork, commonly found in religious buildings. They can also serve as the upper limit of a tunnel.

Column: A column is a structural element that carries the weight of a structure through compression. It is a large round support made of stone with a capital and base, while a smaller wooden or metal support is called a post. Piers are supports with a non-round section.

Dome: A dome is an architectural element resembling a hollow upper half of a sphere. It may overlap with the term cupola, which can refer to a dome or a structure atop it. The exact definition of a dome has been debated, resulting in diverse forms and specialized terms.

Door: A door is a movable barrier that allows entry and exit from an enclosure. It provides security by controlling access and is commonly made of materials suited for its task. Doors are typically attached by hinges but can also move in other ways, like slides or counterbalancing.

Elevator: An elevator, also known as a lift, is a vertical transportation system that moves people or goods between different levels. It is powered by electric motors, using traction cables or hydraulic systems.

Façade: A façade refers to the front or exterior of a building. It originates from the French word façade, meaning "frontage" or "face."

Floor: A floor is the base surface in a room or vehicle, ranging from basic dirt to multi-layered modern structures. Floors can be made of various materials like stone, wood, bamboo, or metal, providing necessary support for expected weight loads.

Foundation (engineering): A foundation in engineering connects a structure to the ground, transferring loads. It can be shallow or deep. Foundation engineering uses soil and rock mechanics in designing foundation elements.

Ladder: A ladder is a set of rungs used for climbing up or down. There are two types: self-supporting rigid ladders and rollable ladders. Rigid ladders have stringers or rails, can be portable or fixed, and are commonly made of metal, wood, or fiberglass.

Lighting: Lighting is the intentional use of light for practical or aesthetic purposes. It involves artificial and natural sources, such as lamps and daylighting in buildings. By using natural light, energy consumption can be reduced. Proper lighting improves task performance, enhances appearance, and positively affects occupants' psychology.

Roof: A roof is the uppermost layer of a building that shields it from various elements such as rain, snow, sunlight, temperature variations, and wind. It is an integral part of the building structure, providing protection and support.

Room: A room is an enclosed space in a building or ship with entry through a door, connecting to other rooms or the outdoors. It accommodates multiple people and is designed to support specific activities with appropriate size, fixtures, furnishings, and placement.

Stairs: Stairs are structures that span vertical distances, dividing it into smaller vertical distances using a series of rectangular platforms called steps. They can be straight, round, or comprised of several straight pieces connected at angles.

Wall: A wall is a structure that defines an area, provides security or shelter, and can be decorative. It can be found in various forms, such as building walls, glass walls, border barriers, brick walls, defensive walls, solid fences, retaining walls, stone walls, and walls that protect from oceans or rivers. Each type serves different purposes like separating rooms, enhancing privacy, preventing floods, or adding aesthetic appeal.

Window: A window is an opening in a surface that allows light to pass through and sometimes sound and air. It consists of a frame and a transparent or translucent material. Windows can be opened or closed for ventilation and protection from weather, and may have mechanisms to lock or hold them open.

Dock: A dock is a human-made structure used for handling boats or ships. In American English, it refers to these structures, while in British English it refers to the water area near a wharf or quay. The meaning of the term varies among different English variants.

Harbor: A harbor is a sheltered body of water where ships can dock. It is often used interchangeably with a port, which is a facility for loading/unloading and receiving passengers. Harbors typically have one or more ports. Alexandria Port in Egypt serves as an example of a harbor with two ports.

Lighthouse: A lighthouse is a tower or building that emits light using lamps and lenses to guide ships and boats safely through waterways, aiding navigational assistance for maritime pilots at sea or on inland water bodies.

Pier: A pier is a raised structure that extends into a body of water, providing access to offshore areas. It is supported by piles or pillars and is used for fishing, boat docking, and recreational activities. Piers allow tides and currents to flow freely, unlike quays or wharfs, which can act as breakwaters. They can range in size and complexity, from lightweight wooden structures to massive ones extending over thousands of feet. In American English, a pier may be called a dock.

Port: A port is a facility where ships load and unload cargo and passengers. It can be located on a sea coast or estuary, or far inland with access to the sea through rivers or canals. Port cities have witnessed significant cultural changes due to their roles as entry points for immigrants and soldiers during war.

Pagoda: A pagoda is an Asian tiered tower with multiple eaves. It is primarily used for religious purposes, predominantly Buddhist or Taoist. The pagoda originated from the stupa in ancient India and is common in various parts of Asia, including China, Japan, Korea, and Vietnam. Chinese pagodas are recognized for their architectural significance and offer breathtaking views.

Pyramid: A pyramid is a geometric structure with triangular outer surfaces that converge at the top, forming a single step. The base of a pyramid can have various polygon shapes, but it always has at least three outer triangular surfaces. A common type of pyramid is the square pyramid, which has a square base and four triangular outer surfaces.

Office: An office is a space where employees perform administrative work for an organization to support its goals. It can also refer to a position within an organization with specific duties. The term "office" can also encompass business-related tasks. In law, the term "office" applies to any place where a company has an official presence. Offices can range from small spaces in a home or business to entire floors or massive buildings dedicated to one company. Generally, an office is where white-collar workers carry out their functions.

Warehouse: A warehouse is a large building used for storing goods by manufacturers, importers, exporters, wholesalers, and transport businesses. Typically located on the outskirts of cities or industrial parks, warehouses are plain structures that serve as a central location for inventory storage and management.

Tower block: A tower block, also known as a high-rise or apartment tower, is a tall building that is used for residential, office, and other purposes. Its height varies depending on the location. In some English-speaking countries, such as the UK, it is referred to as a tower block or a multi-dwelling unit (MDU). A very tall high-rise building is called a skyscraper.

Skyscraper: A skyscraper is a tall building with multiple floors, typically at least 100 or 150 meters in height. Originally, it referred to buildings with 10 to 20 stories, starting in the 1880s. Skyscrapers can accommodate offices, hotels, residential areas, and retail spaces.

Tower: A tower is a tall, self-supporting structure, usually much taller than its width. Unlike masts, towers lack guy-wires and are often accompanied by tall buildings.

Apartment: An apartment is a self-contained housing unit in a building, commonly on one floor. It can have various names. Apartments can be owned, rented, or part of public housing.

House: A house is a residential building with plumbing, electricity, and HVAC systems. It protects inhabitants from weather and has doors and locks for security. It typically includes bedrooms, bathrooms, kitchen, and living room. Some houses have separate dining or recreation rooms. In rural societies, animals may coexist with humans.

Hut: A hut is a small dwelling built using locally available materials like wood, stone, grass, or fabric. It is a type of vernacular architecture, traditionally constructed using techniques passed down through generations.

Igloo: An igloo is a shelter made of snow, also known as a snow house or snow hut.

Palace: A palace is a prestigious dwelling for royalty or high-ranking officials, typically named after Rome's Palatine Hill.

Villa: A villa is a type of house that originated in ancient Rome and has evolved over time. Initially, villas were upper-class country houses, but later they turned into fortified farming compounds and then transformed into elegant upper-class homes during the Middle Ages. In the early modern period, any detached house with a garden near a city or town was referred to as a villa. Nowadays, the term "villa" encompasses various types and sizes of residences, from semi-detached houses to large countryside mansions, particularly found around the Mediterranean.

Hotel: A hotel is a paid lodging establishment that offers short-term accommodation. Rooms can vary from basic to luxurious with amenities such as beds, dressers, refrigerators, TVs, and bathrooms. Smaller hotels may have limited services, while larger ones may provide extras like pools, business centers, childcare, sports facilities, restaurants, spas, and event spaces. Rooms are usually numbered, and some high-end hotels have uniquely designed rooms. In Japan, capsule hotels offer tiny rooms for sleeping and shared bathrooms.

Bathroom: A bathroom is a room in a home or residential building that typically includes a bathtub or shower. It commonly features a wash basin and is sometimes combined with a toilet. In India, bathrooms usually have a toilet, while in other places it may have a separate dedicated room. In the United States, the term "bathroom" is often used for any room with a toilet, regardless of bathing facilities.

Bedroom: A bedroom is a room used for sleeping in a residence. It typically includes one or two beds, a closet, and bedside and dressing tables with drawers. Bedrooms are usually located on floors above ground level and can accommodate various bed sizes, from cribs to California kings. These rooms are designed to keep out insects, reduce light and noise, and provide privacy for a good sleep.

Garage (residential): A residential garage is a structure attached to or separate from a home for storing vehicles. It typically accommodates one or two cars but can house up to three. The garage has a person door for entry into the house and a wider, taller garage door for vehicles. It protects vehicles from weather, theft, and vandalism. Moreover, garages often double as workshops for various projects and can be used for storage or entertainment purposes.

Kitchen: A kitchen is a room or part of a room used for cooking and food preparation. It is equipped with a stove, sink, refrigerator, worktops, and cabinets. Additional appliances may include a microwave and dishwasher. The main functions of a kitchen are to store, prepare, and cook food. It can also be used for dining, entertaining, and laundry. Kitchen design and construction is a significant global market.

Sauna: A sauna is a place where people experience dry or wet heat sessions, causing them to perspire. It can be a room or a building, often equipped with thermometers to measure temperature and hygrometers to measure humidity. Saunas are not considered to include infrared therapy, as per Finnish sauna organizations.

Tent: A tent is a portable shelter made of fabric attached to poles or ropes. It was initially used by nomads as homes and now serves as temporary accommodation for camping and other outdoor activities.

Dam: A dam is a barrier that controls water flow, creating reservoirs for various uses like irrigation, drinking water, and power generation. It can also store water for distribution. Dams primarily retain water, while other structures manage water flow in specific areas.

Drainage: Drainage is the process of removing water from an area with excessive surface and sub-surface water. It can occur naturally or be facilitated through artificial means. Agricultural soils often require internal or artificial drainage to prevent waterlogging and enhance productivity or water management.

Flood control: Flood control encompasses methods to mitigate the negative impacts of floodwaters. It involves reducing flood effects caused by extreme weather, as well as human alterations to waterbodies. There are two types of approaches: structural, which physically constrain floods, and non-structural, which do not. While traditional hard infrastructure like flood walls is effective, modern trends emphasize the use of soft infrastructure and natural systems such as marshes and floodplains. Additionally, coastal management practices play a crucial role in addressing both natural tidal processes and rising sea levels.

Flood control in the Netherlands: Flood control is vital in the Netherlands since a large portion of its land is at risk of flooding and it has a high population density. To combat this, the country utilizes natural sand dunes, constructed dikes, dams, and floodgates to protect against storm surges from the sea. River dikes are also employed to prevent flooding from major rivers. Additionally, an intricate network of drainage ditches, canals, and pumping stations keeps low-lying areas habitable and suitable for agriculture. Local water control boards are responsible for maintaining this system.

Levee: A levee is a structure (usually made of earth) that prevents river course changes and protects against flooding in surrounding areas. It is often parallel to rivers in floodplains or low-lying coastlines.

Reservoir: A reservoir is a man-made or natural lake created by a dam to store fresh water.

Bridge: A bridge is a structure built to span physical obstacles, providing passage over difficult or impossible-to-cross terrain. Various designs of bridges exist, tailored to specific functions, terrains, materials, and available funds.

Tunnel: A tunnel is an underground or undersea passageway created by digging through soil, rock, or laying it under water. It is enclosed, except for the entrance and exit at both ends. Recent tunnels may use immersed tube construction techniques instead of traditional tunnel boring.

Aswan Dam: The Aswan Dam, also known as the Aswan High Dam, is one of the world’s largest embankment dams built across the Nile river in Aswan, Egypt. Completed in 1970, it surpassed the height of the previous Aswan Low Dam and became the tallest earthen dam at the time. The construction of the High Dam was a crucial objective of Egypt's Free Officers movement, aiming to control flooding, provide water storage for irrigation, and generate hydroelectricity to support industrialization. This dam has had a significant impact on Egypt's economy and culture.

Hoover Dam: The Hoover Dam is a concrete arch-gravity dam on the Colorado River bordering Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated by President Franklin D. Roosevelt in 1935. The massive project involved thousands of workers and claimed over 100 lives. Initially named the Boulder Dam, it was later renamed Hoover Dam in 1947 by Congress.

Itaipu Dam: The Itaipu Dam is a large hydroelectric dam on the Paraná River, situated on the Brazil-Paraguay border. It ranks as the world's third largest hydroelectric dam, with a reservoir that is the 45th largest globally.

Three Gorges Dam: The Three Gorges Dam is a massive hydroelectric dam in China spanning the Yangtze River near Yichang. It is the world's largest power station, generating enormous amounts of electricity, with the capacity to produce 95-112 TWh annually, depending on rainfall. It surpassed the previous world record for electricity production set by Brazil's Itaipu Dam.

Akashi Kaikyo Bridge: The Akashi Kaikyo Bridge is a suspension bridge connecting Kobe and Awaji Island in Japan. It is part of the Kobe-Awaji-Naruto Expressway and spans the turbulent Akashi Strait. Completed in 1998, it held the record for the longest central span of any suspension bridge in the world at 1,991 meters (6,532 ft). It is currently the second-longest suspension bridge, with the new record held by the Çanakkale Bridge in Turkey.

Brooklyn Bridge: The Brooklyn Bridge is a hybrid cable-stayed/suspension bridge in NYC, connecting Manhattan and Brooklyn across the East River. It opened in 1883, becoming the first fixed crossing of the river. At that time, it was also the world's longest suspension bridge with a main span of 1,595.5 feet. Initially known as the New York and Brooklyn Bridge, it was officially renamed the Brooklyn Bridge in 1915.

Golden Gate Bridge: The Golden Gate Bridge is a suspension bridge that spans the Golden Gate strait, connecting San Francisco with Marin County. It carries both car and bike traffic, and is part of U.S. Bicycle Route 95. Recognized as one of the Wonders of the Modern World, it has become an iconic symbol of San Francisco and California.

London Bridge: London Bridge is a historic river crossing over the Thames in central London. It has seen multiple iterations, with the current bridge being a box girder bridge made of concrete and steel. It opened in 1973, replacing a 19th-century stone-arched bridge and a 600-year-old medieval structure. Over the years, the bridge has supported a bustling area of homes and businesses and was guarded by a large stone City gateway. The history of the bridge dates back to a timber bridge built by the Romans in 50 AD. It remains an iconic symbol of London.

Channel Tunnel: The Channel Tunnel, also known as the Chunnel, is a 50.46-kilometer undersea railway tunnel that opened in 1994. It connects Folkestone in England with Coquelles in France beneath the English Channel. It is the only fixed link between Great Britain and mainland Europe. The tunnel reaches a depth of 75 meters below the seabed and 115 meters below sea level. With a 37.9-kilometer underwater section, it is the longest of its kind globally and the third-longest railway tunnel in the world. Trains can travel at speeds up to 160 kilometers per hour. The Channel Tunnel is currently owned and operated by Getlink, formerly Groupe Eurotunnel.

Machine: A machine is a physical system powered by various sources to perform tasks by applying forces and controlling movement. It applies to both man-made devices like engines and motors, as well as natural biological macromolecules known as molecular machines. Machines can be driven by animals, people, wind, water, or energy sources like chemical, thermal, or electrical power. They consist of mechanisms that shape input to achieve specific output forces and movement. Additionally, machines may involve computers and sensors to monitor performance and plan movement in what is referred to as mechanical systems.

Robotics: Robotics is the study of creating and using robots, encompassing their design, construction, operation, and various applications.

Robot: A robot is a programmable machine capable of performing complex actions automatically. It can be controlled externally or internally. While some robots resemble humans, most are functional machines designed for specific tasks rather than aesthetic appeal.

Engine: An engine is a machine that converts energy into mechanical energy.

Electric motor: An electric motor is a machine that converts electrical energy into mechanical energy through the interaction between a magnetic field and electric current in a wire winding, generating torque on the motor's shaft. It is similar to an electric generator, which converts mechanical energy into electrical energy.

Internal combustion engine: An internal combustion engine is a heat engine that uses combustion of fuel with an oxidizer in a combustion chamber to produce high-temperature and high-pressure gases. These gases then apply direct force to pistons, turbine blades, a rotor, or a nozzle, converting chemical energy into kinetic energy to power the engine and anything attached to it.

Diesel engine: A diesel engine is an internal combustion engine that ignites fuel through compressed air in the cylinder. It is named after Rudolf Diesel and differs from spark plug-ignition engines like petrol or gas engines.

Four-stroke engine: A four-stroke engine is an internal combustion engine that completes four separate strokes while turning the crankshaft. These strokes are intake, compression, combustion, and exhaust. In the intake stroke, the piston creates a vacuum to pull in an air-fuel mixture. In the compression stroke, the piston compresses the mixture in preparation for ignition. The combustion stroke ignites the mixture, producing mechanical work. Finally, the exhaust stroke expels the spent mixture.

Steam engine: A steam engine is a heat engine that uses steam as its working fluid to perform mechanical work. It utilizes steam pressure to move a piston back and forth in a cylinder, which can then be transformed into rotational force for work. Steam engines are external combustion engines that operate on the Rankine cycle. The term "steam engine" typically refers to reciprocating engines and does not include steam turbines. It can pertain to complete steam plants, such as locomotives and portable engines, or just the piston or turbine machinery alone.

Siphon: A siphon is a device that uses the flow of liquids through tubes, particularly a tube shaped like an inverted "U". It allows liquids to flow upwards without a pump, using gravity to drive the liquid down the tube and discharge it at a lower level than the source reservoir.

Pipe (fluid conveyance): A pipe is a tubular object that can convey fluids, including liquids, gases, slurries, powders, and small solids. It can also be used structurally as hollow pipe is more rigid per unit weight than solid objects.

Gasket: A gasket is a mechanical seal that prevents leakage between joined objects under compression. It is a deformable material used to create and maintain a static seal in mechanical assemblies.

Valve: A valve is a device that controls the flow of a fluid by opening, closing, or partially obstructing passageways. It regulates the direction from high pressure to low pressure. The term comes from the Latin word for the moving part of a door, indicating its function to turn or roll.

Plumbing: Plumbing is a versatile system that transports fluids using pipes, valves, fixtures, and tanks. It serves various purposes like HVAC, waste removal, and delivering safe drinking water. Its origins can be traced back to the Roman era where lead pipes were first employed.

Sink: A sink is a bowl-shaped fixture with a tap for hot and cold water, used for washing hands, dishes, and other purposes. It has a drain to remove used water, a strainer, and an overflow-prevention device. Some sinks also have a spray feature for rinsing and an integrated soap dispenser. They are commonly found adjacent to or inside kitchen counters.

Toilet: A toilet is a sanitary fixture that collects human waste and sometimes toilet paper. Flush toilets use water, while non-flush toilets do not. They can be designed for sitting or squatting positions. Flush toilets are connected to a sewer system in urban areas, while dry toilets are connected to storage or treatment devices. The waste is called blackwater and when combined with other sources, it becomes sewage. Some toilets also include features for those with disabilities, such as a toilet seat or urine diversion.

Chainsaw: A chainsaw is a powered saw with rotating teeth on a chain that cuts along a guide bar. It is used for various tasks like tree cutting, pruning, firebreak creation, firewood harvesting, and more. Chainsaws have a history in surgery and the first patents for wood chainsaws emerged in the late 19th century.

Combine harvester: The combine harvester is a machine that harvests various grain crops by combining multiple harvesting operations into one process. It can harvest crops like wheat, rice, oats, barley, corn, soybeans, and more. After harvesting, the straw can be used for livestock bedding or ploughed back into the field.

Cotton gin: The cotton gin is a machine that efficiently separates cotton fibers from their seeds, increasing productivity. It allows the fibers to be processed into different cotton goods and undamaged cotton is used for textiles. The separated seeds can be used for growing more cotton or producing cottonseed oil.

Cultivator: A cultivator is an agricultural equipment used for secondary tillage. It can refer to frames with teeth that penetrate the soil or machines that use rotating disks or teeth. A key example is the rotary tiller.

Irrigation sprinkler: An irrigation sprinkler is a device used for watering and cooling various areas, including crops, lawns, landscapes, and golf courses. It efficiently distributes water through a network of pumps, valves, pipes, and sprinklers, resembling controlled rainfall. Moreover, it helps control airborne dust.

Lawn mower: A lawn mower is a device with revolving blades used to cut grass to an even height. The height can be adjusted by the operator through a lever or mechanism. It can be powered by manual force, battery, or an internal combustion engine. Smaller mowers require human power while larger ones are either self-propelled or ride-on types. Some mowers can operate autonomously with a robotic design.

Home appliance: A home appliance, a domestic or electric appliance, aids in cooking, cleaning, and food preservation in households.

Clothes dryer: A clothes dryer, or tumble dryer, is a powered household appliance used to remove moisture from clothing, bedding, and textiles after they are washed.

Dishwasher: A dishwasher is an automatic machine that cleans dishware, cookware, and cutlery by spraying hot water at them, eliminating the need for manual scrubbing. It uses temperatures between 45 and 75 °C, adjusting to delicate items.

Furnace (central heating): A furnace is a heating appliance used to heat buildings, commonly a part of central heating systems. It generates heat using natural gas or other fuels like LPG, fuel oil, wood, or coal. Furnaces can use air, steam, or hot water to distribute heat. Modern high-efficiency furnaces can be up to 98% efficient and do not require a chimney. They can be vented through flue pipes or PVC pipes. Fuel efficiency in gas furnaces is measured in AFUE.

Ironing: Ironing is the process of using a heated iron to remove wrinkles from fabric. The temperature used ranges from 180-220 °Celsius, depending on the type of fabric. By heating the fabric, the long-chain polymer molecules in the fibers are loosened, allowing them to be straightened by the weight of the iron. Adding water can help loosen the intermolecular bonds in fabrics like cotton. Modern fabrics, however, are often designed to require minimal or no ironing. Permanent press clothing combines wrinkle-resistant polyester with cotton to reduce the need for ironing.

Lock and key: A lock is a device that can be opened by a physical object, secret information, or a combination. It may only allow access from one side, like a door chain.

Microwave oven: A microwave oven or simply microwave is an electric appliance that uses electromagnetic radiation to quickly and efficiently heat and cook food. By causing the molecules in the food to rotate through dielectric heating, it produces thermal energy. This method of heating is uniform and effective in the outer layer of high-water-content food items.

Cavity magnetron: The cavity magnetron is a high-power vacuum tube used in radar systems, microwave ovens, and particle accelerators. It generates microwaves by interacting electrons with a magnetic field while passing through small cavities in a metal block. The resonant frequency of the cavities determines the resulting microwaves. Unlike other vacuum tubes, the magnetron cannot amplify microwave signals; it solely functions as an electronic oscillator to generate microwaves from direct current electricity.

Oven: An oven is a versatile tool that exposes materials to controlled heat. It consists of a hollow chamber and can be used for various tasks since ancient times. There are different types of ovens, each designed for specific purposes and heat generation methods.

Refrigerator: A refrigerator, also known as a fridge, is an appliance that cools a thermally insulated compartment using a heat pump. This technique lowers the temperature inside to prevent spoilage by reducing bacteria reproduction. The optimal temperature range for perishable food storage is 3 to 5 °C. It replaced the icebox, which was a common household appliance for a long time. The United States Food and Drug Administration recommends keeping the refrigerator at or below 4 °C and the freezer at −18 °C.

Sewing machine: A sewing machine is a device that stitches fabric with thread, revolutionizing the clothing industry by reducing manual labor. Invented in 1790 by Thomas Saint, it significantly enhances efficiency and productivity in garment manufacturing.

Stove: A stove is a heat-generating device used for cooking or heating. It can be powered by various fuels such as electricity, natural gas, gasoline, wood, or coal.

Vacuum cleaner: A vacuum cleaner, also called a vacuum, is an electric device that uses suction to remove dirt from various surfaces like floors, upholstery, and draperies.

Washing machine: A washing machine is a water-based home appliance used for laundry; it cleans clothes using laundry detergent in liquid, powder, or sheet form.

Centrifuge: A centrifuge is a device that separates fluids based on their densities by spinning them at high speed. It causes denser substances to move outward and settle at the bottom, while less dense substances rise to the top. This process is used in laboratories to separate components of fluids and filter contaminants.

Crane (machine): A crane is a powerful machine used for lifting and moving heavy materials. Equipped with hoist ropes, wire ropes or chains, and sheaves, it can transport objects vertically and horizontally. By utilizing simple machines, cranes create mechanical advantage to move loads beyond human capability. They are commonly employed in transportation, construction, and manufacturing industries for loading, unloading, and assembling heavy objects and equipment.

Lathe: A lathe is a machine that rotates a workpiece to perform operations like cutting, sanding, drilling, and turning. It uses tools to shape the workpiece symmetrically around its axis.

Machine press: A machine press is a tool that uses pressure to reshape workpieces. It is operated by a tool-setter.

Potter's wheel: A potter's wheel is a machine used in pottery to shape clay into round ceramic ware. It is also used for trimming excess clay, applying decorations, and adding color. The wheel was widely used in the Old World but not in the Pre-Columbian New World, where pottery was made by hand using techniques like coiling and beating.

Chain: A chain is a series of connected metal links, resembling a flexible rope, that can bear tension and transmit power or provide support. The design of a chain depends on its purpose: lifting, pulling, securing, or transferring power in machines. Chains for lifting and securing have torus-shaped links, allowing flexibility in two dimensions, while power-transfer chains have toothed links and flexibility in only one dimension.

Rope: Rope is a durable and robust structure made by twisting or braiding together various yarns, plies, fibers, or strands. It possesses high tensile strength, making it suitable for tasks such as dragging and lifting. Compared to cord, string, and twine, rope is both thicker and stronger.

Knot: A knot is a deliberate twist in a cord that can serve practical or decorative purposes. Practical knots serve various functions, such as fastening ropes together or creating loops. Knots can also include stoppers or knobs to prevent slipping. They have been of interest throughout history for their practical uses and mathematical intricacy studied in knot theory.

Spring (device): A spring is an elastic device made of rigid material that can return to its shape after being compressed or extended, allowing it to store energy. Coil springs are the most common type, but there are various designs. They are typically made of spring steel. An example of a non-metallic spring is the bow, which stores energy to propel an arrow when drawn.

Fastener: Fasteners are hardware devices used to join or affix objects together. They create non-permanent joints, allowing for easy removal without causing damage. Steel fasteners are commonly made of stainless steel, carbon steel, or alloy steel.

Nail (fastener): A nail is a small metal fastener used in woodworking and construction, acting as a peg or decoration. It typically has a sharp point and a flat head, although headless nails exist. Nails come in various forms, like wire nails, pins, tacks, brads, spikes, and cleats, catering to specific purposes.

Nut (hardware): A nut is a threaded fastener used with bolts to join multiple parts together. It relies on friction, bolt stretching, and compression to keep the parts secured.

Rivet: A rivet is a permanent mechanical fastener with a smooth shaft and a head on one end. The other end, called the tail, is deformed during installation and forms a shop head or buck-tail.

Washer (hardware): A washer is a thin plate with a hole that distributes the load of a threaded fastener. It can also be used as a spacer, spring, wear pad, preload indicating device, locking device, and to reduce vibration.

Gear: A gear is a circular machine part with teeth that meshes with another part to transmit rotation power, allowing for changes in speed, torque, and rotational axis. The teeth on the gears are of the same shape.

Simple machine: A simple machine is a mechanical device that alters force direction or magnitude. They are basic mechanisms that use mechanical advantage to increase force. The term generally includes the six classical machines: lever, wheel and axle, pulley, inclined plane, wedge, and screw.

Inclined plane: An inclined plane, also called a ramp, is a flat surface tilted at an angle used to raise or lower loads. It is a simple machine and commonly used to overcome vertical obstacles. Examples include loading goods onto trucks, pedestrian ramps, and vehicles climbing steep grades.

Lever: A lever is a simple machine that consists of a rigid rod pivoted at a fixed point. It can rotate on itself and is divided into three types based on the positions of the fulcrum, load, and effort. This mechanical advantage device amplifies input force to produce a greater output force, providing leverage. Levers are one of the six simple machines identified by Renaissance scientists.

Pulley: A pulley is a wheel that helps move and change the direction of a cable or belt. It can also transfer power between itself and a shaft. A sheave or pulley wheel is a pulley with an axle supported by a frame or shell to guide a cable or exert force.

Screw (simple machine): A screw is a simple machine that converts rotational motion to linear motion. It consists of a cylindrical shaft with helical grooves called threads. By rotating the screw, it moves along its axis, either through a threaded hole or with a threaded collar rotating around it. The screw is commonly used to apply force or fasten objects together. Geometrically, it can be seen as an inclined plane wrapped around a cylinder.

Wedge: A wedge is a triangular tool and one of the six simple machines. It can separate or lift objects and hold them in place. By converting force from its blunt end, it generates perpendicular forces on its inclined surfaces. A wedge's mechanical advantage depends on the ratio of its slope length to width. The length and angle of the wedge affect its efficiency, with shorter and wider wedges requiring more force than longer and narrower ones.

Wheel: A wheel is a circular component designed to rotate on an axle bearing. It is a crucial part of the wheel and axle, one of the six simple machines. Wheels, in combination with axles, enable effortless movement and transportation of heavy objects, support loads, and aid in machine labor. They serve various purposes, such as steering wheels, ship's wheels, potter's wheels, and flywheels.

Bearing (mechanical): A bearing is a mechanical component that enables smooth movement between parts while reducing friction. It can allow linear or rotational motion and control forces to prevent undesired movement. Bearings are categorized based on their operation, allowed motions, or load directions. Their primary function is to minimize friction and facilitate desired motion.

Wheel and axle: The wheel and axle is a simple machine where a larger wheel and a smaller axle rotate together. It transfers force from one part to the other and can be seen as a version of a lever. The drive force is applied to the wheel's perimeter while the load force is applied to the axle, which acts as a fulcrum.

Axle: An axle is a central shaft used in wheeled vehicles for rotating wheels or gears. It can be either fixed to the wheels and rotate with them, or fixed to the vehicle while the wheels rotate around it. Bearings or bushings are used to support the axle when it is fixed to the wheels, while a bearing or bushing inside the wheel allows it to rotate around the axle when the axle is fixed to the vehicle. In bicycles, this type of axle is sometimes called a spindle.

Clutch: A clutch is a mechanical device that separates the output shaft from the rotating input shaft. It enables disconnection of the motor from the working mechanism.

Tool: A tool is an object that enhances a person's ability to modify their environment or achieve specific tasks. While some animals use simple tools, humans have been observed using tools for making other tools, dating back hundreds of millennia.

Archimedes' screw: The Archimedes' screw, also known as the Archimedean screw or water screw, is an ancient hydraulic machine used for lifting water. It consists of a screw-shaped surface inside a pipe that rotates to raise water from a lower body into irrigation ditches. Although it cannot generate pressure, it has been used as a water pump for centuries. Nowadays, Archimedes' screws are commonly used in wastewater treatment plants and for dewatering low-lying areas. Interestingly, when reversed, these screws can function as small hydroelectric power plants, suitable for low head sites and moderate flow rates. This reversible feature allows them to operate both as pumps and generators, meeting various power and water flow requirements.

Harrow (tool): A harrow is an agricultural tool used for surface tillage after ploughing to break up clods and create a suitable soil structure for seed planting. It also removes weeds and covers seeds when sown.

Hoe (tool): A hoe is a versatile hand tool used in agriculture and horticulture. It is used to shape soil, remove weeds, clear soil, and harvest root crops. Its functions include piling soil around plants, digging furrows and trenches for planting seeds, weeding and clearing the soil of old roots. Hoes can also be used to harvest root crops like potatoes.

Machete: A machete is a versatile tool with a broad blade, used in both agriculture and combat. It typically has a length of 30 to 66 centimeters and a thickness of under 3 millimeters. The word "machete" may derive from the Spanish word for "sledgehammer" or the Greek and Roman name for the falcata, a type of sword. The term "matchet" is rarely used in English. In parts of the Caribbean, such as Jamaica and Barbados, the term "cutlass" is used for similar agricultural tools.

Plough: A plough is a farm tool used to prepare soil for planting, traditionally pulled by oxen or horses but now by tractors. It has a frame made of wood, iron, or steel and a blade to cut and loosen the soil. This tool has been essential for farming throughout history. The Romans used a wheel-less plough called the aratrum, while the Celts introduced wheeled ploughs during the Roman era.

Rake (tool): A rake is an outdoor broom used for collecting leaves, hay, grass, and more. It consists of a handle attached to a toothed bar or tines, and is used in gardening for various tasks like loosening soil, light weeding, leveling, and removing dead grass from lawns. It serves similar purposes as a harrow in agriculture.

Sickle: A sickle is an agricultural tool with curved blades used for harvesting grains or cutting forage for livestock. It is also known as a bagging hook, reaping-hook, or grasshook. The term "falx" was once used interchangeably but later referred to tools with curved blades.

Shovel: A shovel is a versatile tool for digging, lifting, and moving various materials like soil, coal, gravel, snow, sand, or ore.

Ink: Ink is a colored substance used to create images or text on a surface. It can be in the form of gel, sol, or solution and contains dye or pigment. Inks are used for drawing and writing with various tools like pens, brushes, and quills. Thicker ink pastes are widely used in letterpress and lithographic printing.

Modelling clay: Modelling clay, or modelling compound, is a malleable substance used for building and sculpting. It can be shaped and molded easily due to its pliability. The composition and production processes of modelling clay vary significantly.

Paint: Paint is a colored liquid that forms a film when it dries on a solid surface, resulting in a painting. It comes in various colors and types, with oil-based and water-based being the most common. Each type has unique qualities.

Brush: A brush is a versatile tool with bristles or filaments attached to a handle or block. It is used for cleaning, grooming, painting, and various other purposes. Brushes are designed with materials that withstand hazards such as chemicals, heat, and abrasion. They are commonly found in households and there are numerous types available.

Pastel: Pastel is an art medium made of powdered pigment and a binder. It can be found in various forms, like sticks, squares, pebbles, or pans of color. The pigments used in pastels are similar to those in oil paints, and the binder has a neutral hue and low saturation. Pastels create a color effect that closely resembles natural dry pigments.

Pencil: A pencil is a writing tool with a solid pigment core inside a casing, reducing breakage and preventing marks on the user's hand.

Pigment: A pigment is a color powder that alters visual appearance. It is insoluble and chemically unreactive in water. In contrast to dyes, pigments are often inorganic substances. Examples of important pigments throughout history include ochre, charcoal, and lapis lazuli.

Pen: A pen is a writing instrument that applies ink to a surface, typically paper. Early pens like reed, quill, dip, and ruling pens were manually recharged with ink. Today, they are mostly used for illustration and calligraphy. Writing pens have been replaced by ballpoint, rollerball, fountain, and felt/ceramic tip pens. Ruling pens for technical drawing have been replaced by technical pens. Modern pens have built-in ink reservoirs, eliminating the need for dipping in ink while writing.

Container: A container is a durable receptacle used for storage, packaging, and transportation, including shipping. It provides protection to its contents, with materials that can be rigid and durable.

Axe: An axe is a versatile tool and symbol that has been used for centuries to shape, split, and cut wood, harvest timber, serve as a weapon, and hold ceremonial importance. It typically comprises an axe head and a handle, known as a haft or helve.

Chisel: A chisel is a hand tool with a blade on one end that is used for carving or cutting hard materials like wood, stone, or metal. It is struck with a mallet or can be powered by machines. The handle and blade are typically made of metal or wood and have a sharp cutting edge.

Clamp (tool): A clamp is a tool that applies pressure to hold objects firmly in place. In the UK, the term "cramp" is used for temporary positioning during construction and woodworking, while "clamp" refers to holding devices like wheel or surgical clamps.

Drilling: Drilling is a cutting process that uses a rotary drill bit to create circular holes in solid materials. The drill bit is pressed against the work-piece and rotated at high speeds, resulting in the removal of chips or swarf from the hole being drilled.

Hammer: A hammer is a hand tool with a weighted head attached to a long handle for delivering impacts to objects. It can drive nails, shape metal, crush rock, and has various applications in carpentry, blacksmithing, warfare, and music. It is versatile for driving, shaping, breaking, and non-destructive striking purposes.

Plane (tool): A hand plane is a woodworking tool that uses force to shape wood surfaces. It is suitable for fine-scale planing, unlike motorized power planers which are better for larger tasks.

Saw: A saw is a cutting tool with a toothed blade or chain used to cut through different materials. It can have various toothed and abrasive features.

Scissors: Scissors are hand-operated cutting tools with two pivoted blades that slide against each other to cut thin materials like paper, cloth, and wire. There are different types of scissors, including hair-cutting shears with specific blade angles for cutting hair, and kitchen shears for trimming foods like meats. Using the wrong scissors can cause damage or split ends when cutting hair.

Instrumentation: Instrumentation refers to the use, creation, and study of measuring instruments for indicating, measuring, and recording physical quantities. It encompasses the fields of metrology, automation, and control theory, and traces its origins to the art and science of scientific instrument-making.

Barometer: A barometer is a scientific instrument for measuring air pressure, used to forecast short term changes in weather. It assists in surface weather analysis by detecting troughs, pressure systems, and frontal boundaries.

Calipers: Calipers, or callipers, are instruments for measuring object dimensions, such as hole diameter or depth. The term originated from Latin roots, signifying precise pincer-like tools.

Ruler: A ruler, or rule, is an instrument used to measure length by reading from markings called "rules" along its edge. It is usually rigid with a straightedge to draw straight lines. Some rulers are non-rigid, like tape measures. There are also specialty rulers with flexible edges for sewing, arts, and crafts.

Photometer: A photometer measures electromagnetic radiation across the UV to infrared range, including visible light. It converts light into an electric current using a variety of methods such as a photoresistor, photodiode, or photomultiplier.

Spectrometer: A spectrometer is a scientific instrument that separates and measures spectral components of a physical phenomenon. It can measure the spectrum of colors in visible light or the masses of atoms or molecules in a gas. Spectrometers were developed in early studies of physics, astronomy, and chemistry to determine chemical composition. They are used in astronomy to analyze stars and planets, and gather data on the origin of the universe.

Thermometer: A thermometer is a device to measure temperature or temperature changes. It comprises two main elements: a temperature sensor and a way to convert the change into a numerical value. Thermometers are used in various fields like technology, industry, meteorology, medicine, and scientific research for monitoring processes.

Theodolite: A theodolite is a highly precise optical instrument for measuring angles between visible points in both horizontal and vertical planes. It is commonly utilized in land surveying, construction projects, and specialized areas like meteorology and rocket launching.

DNA profiling: DNA profiling is the identification of an individual's unique DNA characteristics. It involves analyzing the individual's DNA to determine their genetic makeup. This process is used to establish a person's identity or to identify a specific species through DNA barcoding.

Electrocardiography: Electrocardiography, or ECG, is the process of recording the heart's electrical activity over multiple cardiac cycles. By using electrodes placed on the skin, it creates a graph showing voltage changes over time. This technique detects small electrical alterations resulting from the heart's depolarization and repolarization during each heartbeat. It is useful in identifying various cardiac abnormalities, such as rhythm disturbances, insufficient blood flow to the coronary arteries, and electrolyte imbalances.

Endoscopy: Endoscopy is a medical procedure that uses an endoscope to examine the inside of the body. It is inserted directly into a hollow organ or cavity, providing a detailed view not available with other imaging techniques.

Medical imaging: Medical imaging is the technique of visualizing the inside of the body for clinical analysis and intervention. It helps to diagnose diseases, identify abnormalities, and understand organ function. It creates a database of normal anatomy and physiology by revealing hidden internal structures.

Magnetic resonance imaging: Magnetic resonance imaging (MRI) is a radiation-free medical imaging technique that uses strong magnetic fields, radio waves, and magnetic field gradients to create detailed images of the body's anatomy and physiological processes. MRI does not involve X-rays or ionizing radiation, distinguishing it from other imaging methods like CT scans and PET scans. Additionally, MRI is a specific application of nuclear magnetic resonance (NMR) and can also be used for imaging in other NMR applications.

Medical ultrasound: Medical ultrasound is a diagnostic and therapeutic technique that uses sound waves to create images of internal body structures. It can be used to examine tendons, muscles, joints, blood vessels, and internal organs, measure characteristics, and generate audible sound. The visual images produced by ultrasound are called ultrasonograms, and the machine used is called an ultrasound machine or sonograph. This technique is widely used in medicine and is known as medical ultrasonography or simply sonography. The examination of pregnant women with ultrasound is called obstetric ultrasonography, and it was one of the early developments in clinical ultrasound.

Radiography: Radiography is an imaging technique that uses X-rays or similar radiation to visualize the internal structure of objects. It is commonly used in medical and industrial settings, as well as airport security. By projecting X-rays onto an object, the radiation that passes through is captured by a detector to create a two-dimensional image. In computed tomography, the subject moves through a rotating X-ray beam to generate three-dimensional images by analyzing the attenuation of multiple X-ray beams from different directions.

Artificial organ: An artificial organ is a human-made device or tissue that replaces or enhances the function of a natural organ. It can interface with living tissue, allowing patients to return to a normal life. Artificial organs are not limited to life support functions and can include replacements for bones and joints.

Prosthesis: A prosthesis is an artificial device used in medicine to replace a missing body part due to trauma, disease, or a condition present at birth. It aims to restore normal functions and is part of amputee rehabilitation coordinated by a team of professionals. Prostheses can be handmade or designed using computer-aided design (CAD) software for analysis and optimization.

Wheelchair: A wheelchair is a mobile chair with wheels, a footrest, and armrests, mainly used when walking is challenging or impossible due to various health conditions or disabilities.

Cardiopulmonary bypass: Cardiopulmonary bypass (CPB) refers to a technique in which a machine takes over the function of the heart and lungs during cardiac surgery. It maintains blood circulation and oxygen supply to the body, often using a heart-lung machine or "the pump." Perfusionists operate CPB pumps, and this method is a type of extracorporeal circulation. Extracorporeal membrane oxygenation (ECMO) is commonly used for longer-term treatment.

Dialysis (chemistry): Dialysis in chemistry is the separation of molecules in a solution using a semipermeable membrane based on their varying diffusion rates.

Ambulance: An ambulance is a vehicle equipped to transport patients to hospitals, while also providing medical care during transport.

Weapon: A weapon is any tool or device used to harm, kill, or threaten others. It serves various purposes, such as increasing efficiency in hunting or crime, enabling self-defense or law enforcement, engaging in warfare, or even self-inflicted harm. Weapons are broadly defined and can encompass anything used to gain an advantage over an adversary.

Military technology: Military technology is the use of specialized technology for warfare. It includes technologies that are unique to the military and not used by civilians, often due to their dangerous nature or lack of civilian applications.

Battering ram: A battering ram is a siege weapon used to break down walls or gates. It consists of a large log swung with force against the target. Some rams were enclosed in a fire-resistant canopy on wheels, with the log swung from chains or ropes inside.

Stealth technology: Stealth technology, also known as low observable technology, is a military tactic that involves methods to reduce visibility to different detection methods such as radar, infrared, sonar, and others. It applies to personnel, vehicles, aircraft, ships, submarines, missiles, and satellites, resembling camouflage for the electromagnetic spectrum.

Armour: Armour, a protective covering, shields objects, individuals, or vehicles from physical harm caused by direct weapons or projectiles in combat or hazardous environments. Personal armour safeguards soldiers and war animals, whereas vehicle armour is employed in warships, armoured fighting vehicles, and certain ground attack aircraft.

Bulletproof vest: A bulletproof vest is body armor that absorbs impact and prevents penetration from bullets and explosions. It comes in soft form for protection against stabbings or light projectiles, and hard form with metallic or para-aramid components for protection against rifle ammunition. It is worn by police officers, prison officers, security guards, soldiers, and tactical units.

Chain mail: Chain mail is a mesh-like armor made of small metal rings that was widely used in Europe from the 3rd century BC until the 16th century AD. It was also utilized in Asia, Africa, and the Middle East until the 17th century. This type of armor is commonly referred to as a hauberk or byrnie.

Plate armour: Plate armour is a type of body armor made from bronze, iron, or steel plates that fully encase the wearer. It originated in Europe during the Late Middle Ages and was developed as an upgrade to mail suits worn over the 14th century.

Helmet: A helmet is protective headgear that shields the brain, with some serving ceremonial purposes. Soldiers utilize combat helmets, usually constructed from lightweight synthetic fibers like Kevlar.

Shield: A shield is portable armor used to block and protect against attacks in combat. It can intercept close-ranged weapons and projectiles like arrows, providing both active and passive defense.

Fortification: A fortification is a military structure built to defend territories during warfare and establish control in peaceful times. Derived from Latin origins, it combines strength and construction.

Castle: A castle is a fortified structure built in the Middle Ages by the nobility or royalty. It was primarily used as a private residence for lords and nobles, distinguishing it from mansions, palaces, and villas. Although different in form, castles commonly included features such as curtain walls, arrowslits, and portcullises. The term has also been used for structures resembling castles, like hill forts and modern homes.

Defensive wall: A defensive wall is a fortification used to protect settlements from attackers. It can range from simple barriers to complex structures with towers and gates. These walls, like city walls, enclose towns and cities. In some cases, walls extended beyond cities to enclose regions or define boundaries. In mountainous regions, walls were combined with castles to seal valleys. Besides defense, walls also had symbolic importance to represent the identity and autonomy of the communities they protected.

Battle axe: A battle axe is a combat-specific axe that evolved from utility axes. It was crafted for one-handed or two-handed use in combat situations.

Club (weapon): A club is a short wooden stick used as a weapon since prehistoric times. It has been responsible for causing blunt-force trauma, evidenced by archaeological findings like the Nataruk site in Kenya where a conflict between hunter-gatherer groups occurred 10,000 years ago.

Bayonet: A bayonet is a weapon that attaches to the end of a firearm, turning it into a spear-like weapon. It was commonly used by infantry from the 17th to the 20th century. Today, it is considered a secondary weapon, mainly utilized for ceremonial purposes.

Knife: A knife is an ancient tool or weapon with a sharp edge, typically held by a handle. It has evolved over time, being made from various materials like wood, bone, stone, copper, bronze, iron, steel, ceramic, and titanium. Knives are versatile and come in fixed or folding blade designs. They boast diverse patterns and styles, influenced by the maker and country of origin.

Dagger: A dagger is a sharp-pointed fighting knife. It is used for close combat and has historic associations with ritual, ceremony, assassination, and self-defense. Double-edged knives have varied roles in different social contexts.

Spear: A spear is a long pole weapon with a pointed head. The head can be the sharpened end of the shaft or made of materials like bone, obsidian, iron, or steel. Commonly used for hunting and warfare, spearheads are often shaped like triangles, diamonds, or leaves. Fishing spears have multiple sharp points, with or without barbs.

Sword: A sword is a bladed weapon used for cutting or thrusting. It has a longer blade than a knife, attached to a hilt, and can be straight or curved. Thrusting swords have straight blades with pointed tips, while slashing swords are often curved with sharpened cutting edges. They are designed for both thrusting and slashing. The definition of a sword varies with time and location.

Katana: A katana is a curved, single-edged Japanese sword used by samurai in feudal Japan. It has a long grip for two-handed use and is worn with the edge facing upward. In Japan, the specific term for katana is uchigatana, while the term katana often refers to single-edged swords from all over the world.

Rapier: A rapier is a slender, straight sword with a sharply pointed, long, and two-edged blade. It was used in Renaissance Spain and became widely popular in Western Europe during the 16th and 17th centuries. It symbolized the status of nobility or gentlemen.

Boomerang: A boomerang is a thrown tool that spins in flight and has a curved shape. It can be designed either to return to the thrower or as a straight weapon. Some Aboriginal Australians use non-returning boomerangs for hunting.

Sling (weapon): A sling is a hand-thrown projectile weapon used for hurling stones or other blunt objects. It is also known as a shepherd's sling or slingshot and those skilled in using it are called slingers.

Bow and arrow: The bow and arrow is a weapon system consisting of a bow and arrows. It was used for hunting and warfare throughout history. However, it became less relevant with the introduction of firearms. Today, it is primarily used for hunting and sports.

Crossbow: A crossbow is a ranged weapon with a bow-like assembly called a prod mounted horizontally on a tiller. It shoots bolt-like projectiles and is held similar to a long gun. The person who shoots a crossbow is called a crossbowman or an arbalist.

Artillery: Artillery refers to ranged weapons that surpass the range and firepower of infantry firearms. Initially designed to breach fortifications during sieges, they evolved from heavy, immobile siege engines to lighter, more mobile field cannons for use on battlefields. Today, self-propelled artillery vehicles represent the bulk of an army's firepower, offering great versatility and mobility.

Cannon: A cannon is a type of artillery that launches large projectiles using explosive chemical propellant, such as gunpowder. Before the late 19th century, gunpowder was the primary propellant until the invention of smokeless powder. Cannons have varying attributes such as gauge, range, mobility, rate of fire, angle of fire, and firepower, and are considered heavy artillery weapons.

Mortar (weapon): A mortar is a portable weapon that launches explosive shells in high-arcing trajectories. It consists of a metal tube attached to a base plate with a lightweight bipod mount and sight. Mortars are used as indirect fire weapons for close fire support, featuring a variety of ammunition options.

Catapult: A catapult is an ancient siege engine used to launch projectiles over long distances. It relies on the release of stored potential energy, typically achieved through tension or torsion, to propel its payload.

Ballista: The ballista, also known as a bolt thrower, was an ancient missile weapon used to launch bolts or stones at distant targets.

Firearm: A firearm is a portable weapon utilizing an explosive charge to be carried and used by individuals. The term's legal definition varies across countries.

Handgun: A handgun is a one-handed firearm that is shorter in range and harder to shoot accurately compared to long guns. The two most common types are revolvers and semi-automatic pistols, while other handguns like derringers and machine pistols are also used occasionally.

Musket: A musket is a muzzle-loaded long gun that originated in the early 16th century as a heavier version of the arquebus. Initially used for penetrating plate armor, it continued as a generic term for smoothbore long guns until the mid-19th century. The decline of heavy armor led to the disappearance of this type of musket in the mid-16th century. It was further replaced by rifled muskets and breech-loading firearms in the 19th century, ultimately ending the era of the musket.

Rifle: A rifle is a firearm designed for accuracy and power, featuring a barrel with rifling for improved shooting. It is held with both hands and braced against the shoulder for stability. Rifles are widely used in warfare, law enforcement, hunting, and target shooting.

Assault rifle: An assault rifle is a select fire rifle using an intermediate-rifle cartridge and detachable magazine. They first gained widespread use during World War II, with the German StG 44 being the first prominent example. After the war, assault rifles became the standard weapon for most armies, replacing full-powered rifles and submachine guns. Notable modern designs include the AK-47 and M16 and their derivatives.

Shotgun: A shotgun is a firearm that shoots shotshells containing multiple small spherical projectiles or a single solid slug. It is typically smoothbore, but rifled barrels for shooting slugs are also available.

Machine gun: A machine gun is a fully automatic firearm designed for sustained direct fire with rifle cartridges. It differs from automatic shotguns, rifles, and submachine guns in its capacity for continuous firepower. Machine guns do not fire handgun cartridges and are distinct from autocannons which have a caliber of 20 mm or more.

Ammunition: Ammunition refers to materials discharged from weapons that cause an effect on a target. It includes both expendable weapons and component parts of other weapons.

Gunpowder: Gunpowder, also known as black powder, is the oldest explosive compound. It is made up of sulfur, carbon, and potassium nitrate. While sulfur and carbon act as fuels, potassium nitrate aids in the process of combustion. This mixture has been extensively used as a propellant in firearms, artillery, rockets, and fireworks. Additionally, gunpowder is employed as a blasting agent for tasks like mining, quarrying, and constructing pipelines, tunnels, and roads.

Missile: A missile is a self-propelled airborne weapon. It can use a propellant, jet engine, or rocket motor for flight. The term historically included any projectile aimed at a target. Unguided rocket artillery is considered a type of missile. Explosive devices without propulsion are called shells when fired from artillery and bombs if dropped from an aircraft.

Bomb: A bomb is an explosive weapon that rapidly releases energy through an exothermic reaction. It causes damage through mechanical stress, pressure-driven projectiles, and explosion-generated effects. Bombs have been used since the 11th century, originating in East Asia.

Improvised explosive device: An improvised explosive device (IED) is a non-conventional bomb that uses military explosives and a triggering mechanism, often made from artillery shells. These homemade or roadside bombs are commonly used outside traditional military operations.

Cluster munition: Cluster munitions are explosive weapons released from the air or ground, dispersing smaller explosive submunitions. They include cluster bombs, which eject bomblets to kill personnel and destroy vehicles, and other variants for destroying runways or power lines.

Grenade: A grenade is an explosive weapon thrown by hand or launched from a rifle or launcher. It contains an explosive charge, a detonator, and an arming safety. The user removes the safety and throws the grenade. Once released, the safety is disengaged, allowing the detonator to ignite the main charge.

Land mine: A land mine is an explosive device hidden on the ground, designed to destroy or disable enemy targets like combatants and vehicles as they pass by or near it.

Napalm: Napalm is a deadly incendiary mixture used in warfare. It was developed in 1942 by chemist Louis Fieser at Harvard University. Its main ingredients are a gelling agent and a volatile petrochemical. Napalm was first used for fire bombing during World War II and later adopted in flamethrowers.

Horses in warfare: Summary: Horses in warfare have a long history, starting around 4000-3000 BC in Eurasia. The use of horses in war is depicted in a Sumerian illustration from 2500 BC. Chariot warfare became popular in the Ancient Near East by 1600 BC, with improved harness and chariot designs. Training manuals for war horses were written as early as 1350 BC. The use of cavalry replaced chariot tactics, leading to new training methods and extensive treatises on horsemanship. Technological advancements, like the saddle, stirrup, and horse collar, further enhanced the effectiveness of horses in battle.

Chariot: A chariot is a horse-drawn cart used for rapid transportation. The oldest known chariots, found in Russia and Central Anatolia, date back to around 1950–1880 BCE. The invention of the spoked wheel enabled the construction of lightweight chariots.

Tank: A tank is a powerful armored vehicle used for offensive purposes in ground combat. It combines heavy firepower, strong armor, and battlefield mobility provided by tracks and a powerful engine. Tanks are equipped with a turret-mounted main armament and have been a mainstay in modern ground forces, playing a crucial role in combined arms combat.

War elephant: A war elephant is a trained combat elephant used to charge enemies, break their ranks, and cause fear. Elephantry refers to military units with elephant-mounted troops.

Military aircraft: Military aircraft are aircrafts used by legal or rebellious military organizations. There are two types: combat aircraft designed to destroy enemy targets, and non-combat aircraft used for supportive roles. Combat aircraft are procured by military forces, while non-combat aircraft may be developed by either military forces or civilian organizations.

Attack aircraft: An attack aircraft, also known as strike aircraft, is a tactical military plane designed for precise airstrikes against strong low-level air defenses. It specializes in close air support, naval air-to-surface missions, and ground-attack roles.

Bomber: A bomber is a military aircraft used to attack ground and naval targets by dropping bombs, launching torpedoes, or deploying air-launched cruise missiles. It was first used in the Italo-Turkish War and played a devastating role in both World Wars, causing extensive damage to cities, towns, and rural areas. The Italian Caproni Ca 30 and British Bristol T.B.8 were the first purpose-built bombers in 1913. Bombers were sometimes decorated with nose art or victory markings.

Fighter aircraft: Fighter aircraft are military planes designed for air-to-air combat, aiming to achieve air superiority in battle. By controlling the airspace, they enable bombers and attack aircraft to strategically engage and bombard enemy targets.

Weapon of mass destruction: A weapon of mass destruction (WMD) is a type of weapon that can cause widespread harm and damage to people, structures, and the environment. It includes biological, chemical, radiological, nuclear, and other destructive technologies. The term has evolved over time and is often used more for political purposes than technical accuracy. Originally, it referred to aerial bombing with chemical explosives in World War II, but now encompasses large-scale weaponry in warfare, like biological, chemical, radiological, and nuclear warfare.

Biological warfare: Biological warfare, also called germ warfare, involves the use of biological toxins or infectious agents like viruses, bacteria, insects, and fungi to harm or kill humans, animals, or plants during warfare. These biological weapons are living organisms or replicating entities. Entomological warfare is a subset of biological warfare that focuses on using insects as weapons.

Chemical weapon: A chemical weapon is a munition that is designed to harm or kill humans using chemicals. It includes any chemical compound or its precursor that can cause death or injury through chemical action. Munitions or delivery devices designed for chemical weapons are also considered weapons themselves. (Source: Wikipedia)

Nuclear weapon: A nuclear weapon is an explosive device that utilizes nuclear reactions, generating immense destructive force through fission or a combination of fission and fusion reactions. These bombs release significant energy from minimal amounts of matter.

Thermonuclear weapon: A thermonuclear weapon, also known as a fusion weapon or hydrogen bomb, is a second-generation nuclear weapon design that is more destructive and compact than first-generation nuclear bombs. It uses nuclear fusion reactions, which allow for the use of non-fissile depleted uranium as fuel, increasing efficiency in the use of uranium-235 or plutonium-239. The United States conducted the first full-scale thermonuclear test in 1952, and since then, most nuclear powers have employed this concept in the design of their weapons.

Lens: A lens is an optical device that uses refraction to focus or disperse light. It can be a simple lens made of transparent material or a compound lens made of multiple simple lenses. Lenses can be made of glass or plastic and are shaped through grinding, polishing, or molding. Unlike prisms, lenses can form images by focusing light. The term "lens" is also used for devices that focus or disperse waves and radiation in various fields such as microwave, electron, acoustic, and explosive lenses.

Anti-reflective coating: An anti-reflective coating reduces reflection on lenses and optical elements, improving efficiency and contrast in imaging systems. It eliminates reflections, making eyes more visible through glasses and reducing glint from binoculars or telescopes.

Diffraction grating: A diffraction grating is an optical device that diffracts light into different beams due to its periodic structure. This creates structural coloration. The directions and angles of the beams depend on the incident angle, spacing between grating elements, and the light's wavelength. It acts as a dispersive element and is used in monochromators, spectrometers, optical encoders, and wavefront measurement.

Mirror: A mirror, also called a looking glass, reflects images. It reverses the image and allows viewers to see themselves or objects behind them. Mirrors have been made from various materials throughout history, with silver or aluminium coatings on glass being common in modern mirrors due to their reflectivity and smooth surfaces.

Optical fiber: Optical fiber is a flexible glass or plastic fiber that transmits light over long distances and at high bandwidths. It is used in fiber-optic communications for its superior transmission capabilities, as it suffers minimal loss and is not affected by electromagnetic interference. Optical fibers are also utilized for illumination, imaging, and for carrying light into confined spaces. Specialized fibers have other applications like fiber optic sensors and fiber lasers.

Polarizer: A polarizer is an optical filter that allows light waves of a specific polarization to pass through while blocking other polarizations. It can filter mixed polarization light into well-defined polarized light. Common types include linear and circular polarizers. They are used in various optical techniques and instruments, including photography and LCD technology. Polarizers can also be designed for other types of electromagnetic waves like radio waves, microwaves, and X-rays.

Prism (optics): An optical prism is a transparent element that refracts light, typically with one angled surface. Triangular prisms are the most common type, with a triangular base and rectangular sides. Not all prisms are geometric, and they can be made from various transparent materials such as glass or acrylic.

Binoculars: Binoculars are a pair of telescopes aligned to point in the same direction, enabling the user to view distant objects with both eyes. They come in various sizes, from handheld to large military models.

Glasses: Glasses, or eyeglasses, are vision aids that consist of lenses mounted in a frame. They are worn in front of the eyes, with a bridge over the nose and hinged arms (temples) resting over the ears. The lenses can be clear or tinted.

Interferometry: Interferometry is a technique that utilizes the interference of combined waves for gathering data. It is widely employed in various fields such as astronomy, fiber optics, engineering, oceanography, seismology, spectroscopy, and quantum mechanics. Interferometry is pivotal in measuring properties like mechanical stress, velocity, and surface profiles, as well as in making holograms.

Microscope: Microscopes are laboratory instruments that enable the examination of objects too small to be seen with the naked eye. They are used in the field of microscopy, which involves investigating tiny objects and structures. Microscopic refers to things that are invisible to the naked eye without the aid of a microscope.

Electron microscope: An electron microscope uses a beam of electrons to magnify images and produce high-resolution results. It has a much higher resolution than light microscopes, allowing for detailed imaging at around 0.1 nm. There are different types of electron microscopes like transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), scanning electron microscopy (SEM), electron microprobe, ultrafast scanning electron microscopy, low-energy electron microscopy (LEEM), and photoemission electron microscopy (PEEM). These different types serve various purposes such as chemical analysis, surface imaging, and fast operation.

Optical microscope: An optical microscope, also known as a light microscope, uses visible light and lenses to magnify small objects. It is the oldest type of microscope and was possibly invented in the 17th century. While basic models are simple, advanced designs aim to enhance resolution and contrast in samples.

Laser: A laser is a light-emitting device that amplifies light through stimulated emission of electromagnetic radiation. Originally an acronym for light amplification by stimulated emission of radiation, the first laser was built in 1960 by Theodore Maiman, inspired by the work of Charles H. Townes and Arthur Leonard Schawlow.

Camera: A camera is an instrument used to capture images and videos digitally or chemically. It has been pivotal in the fields of photography, videography, visual arts, media, entertainment, surveillance, and scientific research. The camera was invented in the 19th century and has evolved through technological advancements, resulting in a wide variety of models today.

Holography: Holography is a technique that records and reconstructs wavefronts, allowing for the creation of realistic 3D images. It has various applications and can be used with any type of wave.

Photographic film: Photographic film is a transparent strip coated with light-sensitive silver halide crystals, which determine the film's sensitivity, contrast, and resolution. The film is segmented into frames that create separate photographs.

Photography: Photography is the creation of images by recording light, using either electronic sensors or light-sensitive materials. It is used in various fields such as science, manufacturing, and business, as well as in art, film, recreational activities, hobbies, and mass communication.

Digital photography: Digital photography is the use of cameras with electronic sensors to capture images that can be digitally stored, processed, and shared. This modern form of imaging replaces traditional photographic film with an array of electronic photodetectors.

Fine-art photography: Fine-art photography is a form of creative expression where photographers aim to depict their artistic vision. It diverges from representational photography, which captures objective reality, and commercial photography, which focuses on advertising. The main goal of fine-art photography is to convey ideas, messages, or emotions.

Telescope: A telescope is a device that observes distant objects using electromagnetic radiation. Originally, it used lenses or mirrors, but now it includes a wide range of instruments that detect various regions of the electromagnetic spectrum.

Optical telescope: An optical telescope collects and focuses visible light to create magnified images for visual inspection, photography, and data collection using electronic image sensors.

Radio telescope: A radio telescope is an antenna and receiver that detects radio waves from celestial sources. It is used in radio astronomy to study the radio frequency portion of the electromagnetic spectrum emitted by astronomical objects. Unlike optical telescopes, radio telescopes can be used during the day and night.

Hubble Space Telescope: The Hubble Space Telescope, launched in 1990, is a renowned space telescope named after astronomer Edwin Hubble. It is one of the largest and most versatile telescopes, vital for research and a public relations boon for astronomy. Hubble remains in operation in low Earth orbit and is one of NASA's Great Observatories. The Space Telescope Science Institute selects its targets and processes its data, while the Goddard Space Flight Center controls the spacecraft.

Atacama Large Millimeter Array: The Atacama Large Millimeter Array (ALMA) is an astronomical observatory in northern Chile consisting of 66 radio telescopes. It is located in the Atacama Desert at an elevation of 5,000 m (16,000 ft) for optimal observation conditions. ALMA's main purpose is to study electromagnetic radiation at millimeter and submillimeter wavelengths. It helps us understand star and planet formation and provides detailed images of these processes.

Mauna Kea Observatories: The Mauna Kea Observatories (MKO) are a collection of independent astronomical research facilities and massive telescopes situated on Mauna Kea, a mountain on the Big Island of Hawaiʻi, United States. These facilities are located within the "Astronomy Precinct," a 525-acre special land use zone established in 1967 within the 11,228-acre Mauna Kea Science Reserve. The observatories' presence is contentious due to their cultural and environmental impact, as the mountain holds great cultural significance for Native Hawaiians and hosts unique ecosystems.

Spaceflight: Spaceflight is the use of astronautics to fly objects, including spacecraft and satellites, into outer space. It can be manned or unmanned, using either telerobotic or autonomous control. Human spaceflight has achieved significant milestones like reaching the Moon and establishing permanent presence in space through space stations. Prominent programs include Soyuz, Shenzhou, Apollo Moon landing, Space Shuttle, International Space Station, and China's Tiangong Space Station.

Rocket: A rocket is a jet-propelled vehicle that operates in the vacuum of space. It uses an engine that generates thrust by expelling high-speed exhaust. Unlike other vehicles, a rocket carries its own propellant and does not require air for acceleration. Rockets perform more efficiently in a vacuum but experience a loss of thrust in the presence of atmospheric pressure.

Launch pad: A launch pad refers to an above-ground facility used to vertically launch rockets or space vehicles. It includes a central launch platform, as well as additional facilities such as a launch mount, service structure, and infrastructure for propellants, power, communications, telemetry, rocket assembly, and payload processing. It also encompasses storage facilities, equipment, access roads, and drainage.

Launch vehicle: A launch vehicle is a rocket-powered vehicle used to transport payloads from the Earth's surface to outer space. It includes various types of vehicles such as multistage rockets and the Space Shuttle. Launch vehicles operate from launch pads with support from control centers, assembly systems, and fueling. They are designed with advanced aerodynamics and technologies, but the high operating costs are a significant factor.

Rocket engine: A rocket engine is a reaction engine that uses stored propellants as fuel to create a high-speed jet of hot gas, generating thrust through the ejection of mass in accordance with Newton's third law. While most rocket engines rely on chemical combustion, there are non-combusting variants like cold gas thrusters and nuclear thermal rockets. Rocket engines power vehicles used in ballistic missiles and rockets, enabling them to carry their own oxidizer and operate in a vacuum for space travel and missile propulsion.

Satellite: A satellite is a spacecraft placed in orbit around a celestial body. It serves various purposes including communication, weather forecasting, navigation, broadcasting, scientific research, and Earth observation. Some military applications include reconnaissance, early warning, and signals intelligence. Satellites can also be defunct or used as rocket stages for placing other satellites in orbit.

Space station: A space station is a spacecraft designed for humans to live in space for an extended time. It is an artificial satellite without landing or propulsion systems. Stations need docking ports for crew and supply transfers. They are primarily launched for scientific research but also military purposes.

Astronaut: An astronaut is a trained and equipped space traveler who serves as a commander or crew member aboard a spacecraft. This term can include professionals, scientists, politicians, journalists, and tourists who venture into space.

Space capsule: A space capsule is a spacecraft that can transport cargo, experiments, and astronauts to and from space. Unlike other spacecraft, it can survive reentry and return to Earth. Capsules have a blunt shape with no wings and minimal fuel for a safe return. They are often accompanied by a service module and can include additional modules for extended space missions. While capsules are the main design for crewed spacecraft, the Space Shuttle is the only crewed spaceplane that has flown in orbit.

NASA: NASA is the US government agency in charge of the civil space program, aeronautics research, and space research. It replaced NACA in 1958 and has been at the forefront of American space exploration, including the Apollo Moon landing missions. Currently, NASA supports the International Space Station, develops the Orion spacecraft, oversees the Commercial Crew spacecraft, and plans the Lunar Gateway space station for the crewed lunar Artemis program.

Apollo program: The Apollo program, also known as Project Apollo, was a human spaceflight program carried out by NASA from 1968 to 1972. It successfully landed the first humans on the Moon and was dedicated to President Kennedy's goal of "landing a man on the Moon and returning him safely to Earth." Apollo followed the one-person Project Mercury and was preceded by the two-person Project Gemini, which aimed to extend spaceflight capabilities.

Kennedy Space Center: The Kennedy Space Center (KSC) is NASA's main launch center for human spaceflight, research, and technology. It is located in Merritt Island, Florida, and has been operational since December 1968. KSC was the launch site for the Apollo, Skylab, and Space Shuttle programs. It is closely connected to the Cape Canaveral Space Force Station, with shared resources and facilities.

Soviet space program: The Soviet space program, active from 1955 to 1991, was the national space program of the USSR. It played a significant role in space exploration and research until the dissolution of the Soviet Union.

Baikonur Cosmodrome: The Baikonur Cosmodrome is a Russian-operated spaceport in Kazakhstan. It is the largest space launch facility in terms of area and is located in the city of Baikonur. This site is responsible for launching all Russian crewed spaceflights.

Roscosmos: Roscosmos is a state corporation in Russia focused on space activities, flights, cosmonautics programs, and aerospace research.

European Space Agency: The European Space Agency (ESA) is an intergovernmental organization established in 1975 with headquarters in Paris. It consists of 22 member states and aims to advance space exploration. ESA has a global staff of about 2,200 people as of 2018 and operates with an annual budget of €7.08 billion for 2023.

China National Space Administration: The China National Space Administration (CNSA) is the government agency of China responsible for civil space administration and international cooperation. It is headquartered in Beijing and operates under the Ministry of Industry and Information Technology. The CNSA organizes foreign exchanges and cooperation in the aerospace field.

International Space Station: The International Space Station (ISS) is the largest space station ever built. It is located in low Earth orbit and serves as a platform for conducting microgravity and space environment experiments. The ISS is a collaborative effort of five space agencies: NASA, Roscosmos, JAXA, ESA, and CSA.

Mir: Mir was a modular space station operated by the Soviet Union and later Russia from 1986 to 2001. Assembled in orbit, it was the largest artificial satellite in its time, serving as a microgravity research laboratory. Mir allowed for experiments in various fields, including biology, physics, and spacecraft systems, with the aim of developing technologies for long-term space habitation.

Space Shuttle: The Space Shuttle was a reusable spacecraft system, operated by NASA from 1981 to 2011. It was designed for low Earth orbit missions and was part of the Space Shuttle program. The official program name was Space Transportation System (STS) and it was the only funded item from a 1969 plan for a reusable spacecraft system.

Saturn V: The Saturn V was a powerful American rocket developed by NASA for the Apollo program. It had three stages, used liquid fuel, and was designed for human exploration of the Moon. From 1967 to 1973, it successfully completed nine crewed missions to the Moon and also launched Skylab, the first American space station.

Soyuz (spacecraft): Soyuz is a Soviet-designed spacecraft that has been active since the 1960s, with over 140 flights. It replaced the Voskhod and was initially developed for the lunar programs. Launched from Kazakhstan's Baikonur Cosmodrome using a Soyuz rocket, it served as the primary means to transport crew to and from the International Space Station between 2011 and SpaceX Crew Dragon's 2020 demo flight. It remains heavily used for this purpose, although China's crewed Shenzhou flights did not dock with the ISS during this period.

Sputnik 1: Sputnik 1 was the first man-made satellite launched by the Soviet Union in 1957. It transmitted radio signals to Earth for three weeks before its batteries died. It re-entered the atmosphere on January 4, 1958.

Voyager program: The Voyager program is an American scientific program that sent two robotic probes, Voyager 1 and Voyager 2, into interstellar space. Launched in 1977, the Voyager probes took advantage of the alignment of Jupiter, Saturn, Uranus, and Neptune to collect data during flybys. Voyager 2 was specifically sent to Uranus and Neptune to gather additional information.

Transport: Transport refers to the organized movement of people, animals, and goods between different places. It utilizes various modes such as air, land, water, cable, pipelines, and even space. The field encompasses infrastructure, vehicles, and operations. Its crucial role lies in facilitating trade, a vital aspect for societal advancement.

Public transport: Public transport refers to passenger travel systems available for everyone, not just private use. It operates on a schedule and follows established routes, often charging a fee. Examples include buses, trams, trains, and ferries in cities, while airlines, coaches, and intercity rail dominate between cities. High-speed rail networks are being developed globally.

Travel: Travel refers to the act of journeying between different places, which can be achieved by various modes of transportation and with or without luggage. It encompasses both one-way and round trip movements, including shorter stays during the course of traveling, such as tourism experiences.

Freight transport: Freight transport, also known as freight forwarding, involves the movement of goods and cargo. It encompasses transportation by sea, land, and air, and is often referred to as shipping. This term is closely related to logistics, which refers to the planning and management of transporting goods.

Cargo: Cargo refers to goods transported by land, water, or air. It specifically refers to freight when conveyed by water or air. In economics, freight is goods transported at a commercial gain. The term cargo is also used for perishable inventory in transit, even when stored in cold or climate-controlled facilities.

Traffic collision: A traffic collision, also known as a motor vehicle collision, is when a vehicle hits another vehicle, pedestrian, animal, or obstacle. It can cause injuries, death, and property damage, resulting in financial costs for both society and individuals involved. Although road transport is highly dangerous, media attention is often limited compared to less frequent tragedies. The term "car accident" is less preferred, as some collisions are intentional attacks or staged incidents.

Vehicle: A vehicle is a self-propelling machine used for transporting people or cargo. It encompasses a wide range of modes such as wagons, bicycles, motor vehicles, watercraft, aircraft, and more.

Driving: Driving is the controlled operation and movement of land vehicles. Permission to drive on public highways is granted based on meeting certain conditions and following road and traffic laws. The term has evolved from working animals to automobiles. Driving skills have developed over time, encompassing physical, mental, and safety abilities. Driving laws not only pertain to drivers but also the drivability of vehicles.

Filling station: A filling station is where motor vehicle owners can purchase fuel and engine lubricants. Gasoline and diesel fuel are the most commonly sold fuels at these facilities.

Parking: Parking is the act of leaving a vehicle unoccupied. It is allowed on roads, sometimes with limitations, and buildings often provide parking for their users. Governments establish guidelines for parking space design and usage.

Tire: A tire or tyre is a ring-shaped component that transfers a vehicle's load from the axle to the ground and provides traction. It is usually filled with air and acts as a cushion to absorb shock. Tires have a contact patch that matches the weight of the vehicle with the strength of the surface, avoiding excessive deformation.

Train station: A train station, also known as a railroad depot, is a facility where trains stop for passengers and freight. It typically has platforms, tracks, and a station building providing services like ticket sales and waiting rooms. Stations on single-track lines often have passing loops to aid traffic flow.

Road: A road is a paved route used by vehicles and pedestrians for transportation purposes. Unlike streets, roads primarily serve as thoroughfares with improved surfaces to convey traffic efficiently.

Highway: A highway is a road or public way on land, encompassing major roads as well as public tracks. In the US, it can refer to a controlled-access highway or be used as a translation for terms like Autobahn or autoroute.

Controlled-access highway: A controlled-access highway is designed for fast traffic, regulating entry and exit. It is commonly referred to as a freeway, motorway, or expressway, and may also be called throughway or parkway. Some versions are limited-access, offering less separation from other traffic.

Trail: A trail, also called a path or track, is a pathway for non-motorized travel through natural areas. In the UK and Ireland, it is known as a footpath. Trails can also be found along rivers and highways in North America. Historically, the term "trail" was used for routes used by explorers and migrants in wild territories. In the US, "trace" is a synonym for trail.

Bus: A bus is a vehicle that carries more passengers than a car but less than a train. It is used for public transport, charter purposes, or privately owned. Buses can carry 30 to 300 passengers, with single-deck, double-decker, articulated, midibuses, and minibuses being common types. Coaches are used for longer distances. Some buses charge fares, while others are free, like school or shuttle buses. Bus drivers usually require a special license.

Car: A car is a motor vehicle with wheels that is primarily used for transporting people. It typically has four wheels, seats one to eight people, and runs on roads. The first steam-powered car was built by Nicolas-Joseph Cugnot in 1769, while the first internal combustion-powered car was invented by François Isaac de Rivaz in 1808.

Motorcycle: A motorcycle is a motor vehicle with two or three wheels and is controlled by a handlebar from a seat.

Truck: A truck is a motor vehicle designed for transporting freight or performing utilitarian work. It comes in various sizes and configurations, with most having body-on-frame construction and an independent cabin. Some smaller trucks resemble automobiles. Commercial trucks can be large and powerful, often equipped with specialized equipment like refuse trucks or fire trucks. In American English, a truck without a trailer is called a "straight truck," while one designed for pulling a trailer is called a "tractor."

Van: A van is a road vehicle used for transporting goods or people. It can be larger or smaller than a pickup truck and SUV, and bigger than a common car. The word's meaning varies among English-speaking countries. Microvans are the smallest, used for tiny quantities of goods or people. Small vans transport people in small quantities. Larger vans with passenger seats are used for institutional purposes, while those with front seats are used for business purposes. TV stations use specially equipped vans as mobile studios and postal services use large step vans for package delivery.

Taxi: A taxi, or taxicab, is a hired vehicle with a driver, used by individuals or small groups for non-shared rides. Unlike public transport, passengers can choose their pick-up and drop-off locations.

Rail transport: Rail transport is a land transportation system that uses wheeled vehicles on track. It is the second primary means of land transport, used for 8% of global passenger and freight travel due to its energy efficiency and potential for high speed.

Railway track: A railway track, also called a train track or permanent way, is the structure that supports trains. It includes rails, fasteners, railroad ties, ballast, and subgrade. It provides a dependable surface for train wheels to roll on. Originally made with wooden or cast iron rails and sleepers, rails have been made with steel since the 1870s.

Train: A train is a chain of connected vehicles that travel on railway tracks to carry people or goods. It is pulled or pushed by locomotives and can be self-propelled. Passengers and cargo are transported in railroad cars (or wagons) and trains are built to a specific gauge. They operate on steel tracks with steel wheels, providing high efficiency compared to other modes of transportation.

Locomotive: A locomotive is a rail vehicle that powers trains, providing motive power. It may also be referred to as a multiple unit, motor coach, railcar, or power car if it can carry a payload.

Steam locomotive: A steam locomotive is a self-propelled vehicle that operates by using the force generated from the expansion of steam. It burns combustible material in its boiler to heat water, increasing its volume 1,700 times. Essentially, it is a mobile steam engine.

Cable transport: Cable transport refers to various modes of transportation that utilize cables to move passengers and goods. These modes commonly include cable cars. The cables can either be driven or passive, and the movement can be achieved through pulling, sliding, sailing, or internal drives. Cable transport frequently employs pulleys and load balancing mechanisms. It is particularly useful in mountainous regions, allowing for transportation across significant elevation disparities.

Aerial tramway: An aerial tramway, or sky tram, is an aerial lift that uses stationary ropes for support and a moving rope for propulsion. The cabin grip is fixed to the propulsion rope during operations. Aerial tramways have lower line capacities and longer wait times compared to gondola lifts.

High-speed rail: High-speed rail (HSR) is a form of railway transportation that operates trains at much higher speeds than traditional rail systems. It involves the use of specialized trains and dedicated tracks, with speeds exceeding 250 km/h (155 mph) or upgraded lines above 200 km/h (124 mph).

Tram: A tram is an urban rail transit consisting of a rail vehicle that travels on tracks along public streets. Some tramlines have dedicated lanes. They are commonly known as trams or streetcars and are used for public transportation. Many modern tramways are referred to as light rail.

Rapid transit: Rapid transit, also known as mass rapid transit (MRT), heavy rail, or metro, is a high-capacity public transport system built in urban areas. It includes subways, tubes, or underground systems that primarily run below the surface. These railways are exclusive to electric trains, operate in tunnels or on elevated railways, and are separate from pedestrians and vehicles.

Monorail: A monorail is a railway track made up of a single rail or beam. It is commonly used to describe elevated rail systems and people movers. Monorails are typically found in airport transfers and medium-capacity metros. They are always separated from other traffic and pedestrians, distinguishing them from trams and light rail systems.

Carriage: A carriage is a horse-drawn vehicle for people, serving as public transport akin to modern taxis. It can have four wheels, with suspension using leather strapping or steel springs. Two-wheeled carriages are less formal and typically driven by the owner.

Cart: A cart or dray is a two-wheeled vehicle generally pulled by draft animals like horses, donkeys, or oxen. It can also be pulled by smaller animals such as goats or large dogs. Its primary purpose is transportation.

Saddle: A saddle is a supportive structure fastened to an animal's back, commonly used in equestrianism. It evolved from a simple blanket attached by a surcingle or girth to more elaborate padded designs. The invention of the solid saddle tree and paired stirrups completed the basic form still used today. Modern saddles come in various styles, designed for specific disciplines, and require proper fit for both rider and horse. Careful maintenance can prolong a saddle's useful life for decades. This invention played a crucial role in the increased use of domesticated animals in the Classical Era.

Bicycle: A bicycle, also known as a pedal cycle or bike, is a human-powered vehicle with two wheels attached to a frame. It is pedal-driven and has a single-track design, with one wheel behind the other. The rider of a bicycle is called a cyclist or bicyclist.

Rickshaw: A rickshaw is a cart typically pulled by one person carrying one passenger. It was first used in 1879 and has evolved into different types such as cycle, auto, and electric rickshaws. Nowadays, these newer variants have largely replaced the original pulled rickshaw, except in certain tourist areas.

Baby transport: The term 'Baby transport' refers to different methods used for transporting children throughout history and across cultures. These methods include baby carriages, car seats, strollers, slings, backpacks, and bicycle carriers. Each method serves the purpose of providing a convenient and secure way to transport babies and allows parents to go about their daily activities with ease.

Pipeline: A pipeline is a system of pipes used to transport liquids or gases over long distances. There are approximately 2,175,000 miles (3,500,000 km) of pipelines worldwide, with the United States, Russia, and Canada having 76% of the total.

Tractor: A tractor is a slow-moving engineering vehicle used in agriculture, mining, and construction. It provides high tractive effort to haul trailers and machinery. Typically used on farms, tractors power agricultural tasks and can tow or mount various implements. They also serve as a power source for mechanized equipment.

Aviation: Aviation refers to the mechanical flight and aircraft industry. It encompasses various types of aircraft, including fixed-wing and rotary-wing, morphable wings, wing-less lifting bodies, and lighter-than-air craft like hot air balloons and airships.

Aircraft: An aircraft is a flying vehicle that relies on the air to counter gravity. It achieves this through static or dynamic lift from an airfoil or downward thrust from engines. Examples of aircraft include airplanes, helicopters, gliders, airships, paramotors, and hot air balloons.

Jet aircraft: A jet aircraft is propelled by jet engines and can have one or more engines.

Unmanned aerial vehicle: An unmanned aerial vehicle (UAV), or drone, is an aircraft that operates without a human pilot or crew on board. Originally created for military purposes, UAVs have become crucial assets for various industries. Improved control technology and reduced costs have expanded their applications to include tasks such as aerial photography, precision agriculture, monitoring natural disasters, surveillance, inspections, deliveries, and entertainment activities like drone racing.

Airport: An airport is a facility for commercial air transport, with a landing area and buildings to monitor and maintain aircraft. Larger airports may have additional features like taxiways, control centers, and passenger facilities. Some countries also have fixed-base operators for general aviation.

Air traffic control: Air traffic control (ATC) is a ground-based service that guides aircraft both on the ground and within controlled airspace. It aims to prevent collisions, facilitate air traffic flow, and assist pilots through advisory services and essential information.

Parachute: A parachute is a device that creates drag or lift to slow down the descent of an object in the atmosphere. It is commonly used for recreational purposes or as a safety measure for aviators, allowing them to safely exit an aircraft and land on the ground.

Balloon (aeronautics): A balloon is an unpowered aerostat that floats due to its buoyancy in aeronautics. It can be free-moving or tethered, unlike an airship, which is a powered aerostat that can move itself in a controlled way.

Hot air balloon: A hot air balloon is a lighter-than-air aircraft with a bag containing heated air and a basket for passengers and heat source. The heated air makes it buoyant, and the envelope doesn't need to be sealed at the bottom. Modern balloons are made of nylon and can have various shapes.

Airship: An airship, also known as a dirigible balloon, is a self-propelled aircraft that can travel through the air. It operates by utilizing a lifting gas that is lighter than the surrounding air to generate lift.

Fixed-wing aircraft: A fixed-wing aircraft is an airplane that can fly using wings that generate lift from its forward airspeed and wing shape. It is different from rotary-wing aircraft and ornithopters. The wings can be flexible or morphing, and examples include kites, hang gliders, and variable-sweep wing aircraft.

Airplane: An airplane, also known as an aeroplane or plane, is a type of fixed-wing aircraft that is propelled forward by engines. It can be powered by a jet engine, propeller, or rocket engine. Airplanes vary in size, shape, and wing configuration. They have various uses such as recreation, transportation of goods and people, military operations, and research. Commercial aviation plays a major role, carrying billions of passengers and tons of cargo annually. While most airplanes are piloted by humans, some are designed to be remotely or computer-controlled, like drones.

Glider (aircraft): A glider is a type of aircraft that relies on the air's reaction against its lifting surfaces to remain in flight. Unlike most aircraft, gliders do not have an engine and instead depend on the forces of nature to fly. However, there are motor-gliders that have small engines for additional flight capabilities, including self-launching and sustaining altitude.

Helicopter: A helicopter is a rotorcraft that can take off and land vertically, hover, and move in any direction. It uses horizontally spinning rotors for lift and thrust. Unlike fixed-wing aircraft, helicopters can operate in congested or isolated areas without a runway.

Aircraft engine: An aircraft engine, also known as an aero engine, is the power source for an aircraft's propulsion system. It enables powered flight and can be either a piston engine or a gas turbine. In some cases, aircraft engines have been rocket powered, and electric motors are now used in small UAVs.

Jet engine: A jet engine is a reaction engine that generates thrust by expelling a fast-moving jet of heated gas. It refers to various air-breathing engines like turbojets, turbofans, ramjets, pulse jets, and scramjets. Jet engines are typically internal combustion engines.

Wing: A wing is a specialized fin that creates lift in fluid, usually air. It has a streamlined shape and acts as an airfoil. The wing's efficiency is determined by its lift-to-drag ratio, which indicates the ability to generate lift while minimizing drag. It can produce lift that is much greater than the drag it experiences. A higher lift-to-drag ratio allows the wing to generate sufficient lift with less thrust.

New York City Subway: The New York City Subway is a government-owned rapid transit system in Manhattan, Brooklyn, Queens, and the Bronx. It is run by the New York City Transit Authority, a part of the Metropolitan Transportation Authority. It dates back to October 27, 1904, making it one of the oldest and most widely used public transit systems globally, boasting a record 472 operational stations.

London Underground: The London Underground is a rapid transit system serving Greater London and nearby counties in England.

Shinkansen: The Shinkansen, commonly referred to as the bullet train, is a high-speed railway network in Japan. Originally developed to boost economic growth by connecting outlying regions to Tokyo, it now serves as both long-distance travel and commuter rail. It is owned by Japan Railway Construction, Transport and Technology Agency and operated by five Japan Railways Group companies.

Trans-Siberian Railway: The Trans-Siberian Railway, also known as Transsib, is the world's longest railway line spanning over 9,289 kilometers. It connects European Russia to the Russian Far East, running from Moscow in the west to Vladivostok in the east.

Mathematics: Mathematics is a field encompassing numbers, formulas, shapes, quantities, and their changes. It comprises subdisciplines like number theory, algebra, geometry, and analysis. A precise definition for the discipline is still debated among mathematicians.

Scientific notation: Scientific notation is a method used by scientists, mathematicians, and engineers to express extremely large or small numbers. It avoids long decimal strings by using a base ten format. This notation simplifies calculations and is referred to as scientific form or standard index form. It's also known as "SCI" display mode on scientific calculators.

Pure mathematics: Pure mathematics is the examination of mathematical concepts without consideration of their practical applications. The study involves investigating logical outcomes of fundamental principles, with the focus centered on intellectual challenge and aesthetic appeal rather than real-world utility.

Arithmetic: Arithmetic is a branch of mathematics that studies numerical operations like addition, subtraction, multiplication, and division. It also includes exponentiation, roots, and logarithms. It operates on different types of numbers, such as integers, rational numbers, and real numbers. The numeral system used can be decimal or binary. Some arithmetic systems work with mathematical objects other than numbers.

Addition: Addition is a basic arithmetic operation that combines two numbers to give a total or sum. It is one of the four fundamental operations, alongside subtraction, multiplication, and division. An example with apples demonstrates adding two columns of three and two apples to get a total of five apples, which is represented by the equation 3 + 2 = 5.

Subtraction: Subtraction is an arithmetic operation that involves removing objects from a collection. It is one of the four basic arithmetic operations – addition, subtraction, multiplication, and division. Subtraction is commonly associated with natural numbers, but it can also involve negative numbers, fractions, decimals, and other mathematical concepts. Its purpose is to find the difference or decrease between quantities.

Multiplication: Multiplication is a basic arithmetic operation that combines two or more numbers to give a product. It is one of the essential mathematical operations, along with addition, subtraction, and division.

Division (mathematics): Division is a fundamental arithmetic operation alongside addition, subtraction, and multiplication. It involves dividing a dividend by a divisor, leading to a quotient as the result.

Euclidean algorithm: The Euclidean algorithm is a mathematical method for finding the greatest common divisor of two numbers. It was described by the ancient Greek mathematician Euclid and is one of the oldest and most widely used algorithms. It simplifies fractions and is used in various number-theoretic and cryptographic calculations.

Fraction: A fraction represents part of a whole or a number of equal parts. It consists of a numerator (above a line) and a denominator (below the line). The numerator indicates the number of equal parts, while the denominator represents how many of those parts make up a whole. A common example is 3/4, where 3 represents 3 equal parts and 4 indicates that 4 parts make up a whole.

Percentage: A percentage is a number or ratio out of 100, commonly represented by the % sign. It is a dimensionless unit used to express proportions.

Modular arithmetic: Modular arithmetic is a mathematical system that deals with integers. It involves numbers "wrapping around" when they reach a certain value known as the modulus. Carl Friedrich Gauss developed the modern approach to modular arithmetic, which was introduced in his book Disquisitiones Arithmeticae in 1801.

Constant (mathematics): A constant in mathematics is a non-changing quantity, which can be either a fixed number or a function that does not vary with the main variable(s). It can be referred to as a mathematical or physical constant.

Pi: Pi is a mathematical constant (approximately 3.14159) representing the ratio of a circle's circumference to its diameter. It is irrational, meaning it is not expressible as a ratio of two integers. Pi is transcendental, making it impossible to solve the ancient challenge of squaring the circle. Its decimal digits seem random, though no proof of this has been found.

e(mathematical constant): The constant e, approximately equal to 2.71828, serves as the base for natural logarithms. It can be derived as the limit of (1 + 1/n)n as n approaches infinity and is used in compound interest calculations. Additionally, e can be obtained as the sum of an infinite series.

Imaginary unit: The imaginary unit, denoted as 'i', is a solution to the equation x^2 + 1 = 0. It allows for the extension of real numbers to complex numbers, which involve both real and imaginary components. An example of a complex number is 2 + 3i.

Golden ratio: The golden ratio is a mathematical concept where two quantities are in a specific ratio that is equal to the ratio of their sum to the larger quantity. It can be expressed algebraically as a/b = (a+b)/a.

−1: The term '-1' in mathematics refers to the additive inverse of 1, denoting the number that, when added to 1, results in the additive identity, 0. It is the negative integer between -2 and 0.

0: Zero, denoted as '0', is a number that represents an empty quantity. It is the additive identity for various number systems, such as integers, rational numbers, real numbers, and complex numbers. When added to any number, it does not change the value of that number. Multiplying any number by zero results in zero, and division by zero is undefined in arithmetic.

1: '1' is a number that represents a single or the only entity. It is the first positive integer, a numerical digit, and a unit of counting or measurement. In some conventions, it is the first natural number while in others it is considered the second, following '0'.

Equation: An equation is a mathematical formula that connects two expressions with an equals sign. Different languages may have varying definitions, such as French considering equations to have variables. In English, any well-formed formula with two related expressions is considered an equation.

Equation solving: Equation solving involves finding values that satisfy the given equation. These values are called solutions or roots of the equation. A solution is obtained by assigning values to the unknown variables that make the equation true. The solution set refers to the collection of all solutions for an equation.

Polynomial: A polynomial is a mathematical expression made up of variables and coefficients, using addition, subtraction, multiplication, and non-negative integer powers of variables. It can have multiple indeterminates and is written in the form of terms. Examples include x^2 - 4x + 7 and x^3 + 2xyz^2 - yz + 1.

Infinity: Infinity refers to something without limits or restrictions, surpassing all natural numbers. Its symbol is the infinity symbol.

Hilbert's problems: Hilbert's problems, 23 unsolved mathematical problems published by David Hilbert in 1900, had a significant impact on 20th-century mathematics. Hilbert presented ten of the problems at a conference in Paris, and the full list was later published in English translation in the Bulletin of the American Mathematical Society. These problems were influential and widely discussed in the field.

Mathematical proof: A mathematical proof is a deductive argument that logically guarantees a mathematical statement. It uses established statements and axioms with rules of inference. Proofs establish logical certainty and must hold true in all cases. Conjectures or hypotheses are statements believed to be true but not proven.

Formula: A formula is a symbolic representation used in science to convey information concisely, such as in mathematics or chemistry. It is a way of expressing the relationship between given quantities.

Theorem: A theorem is a proven statement in mathematics, backed by a logical argument that uses inference rules and established axioms and theorems.

Conjecture: A conjecture in mathematics is a tentative proposition without proof. Iconic conjectures like the Riemann hypothesis have driven the development of new mathematical areas.

Number: A number is a mathematical concept used for counting, measuring, and labeling. It can be represented by number words or symbols called numerals. Numerals are organized in numeral systems, such as the Hindu-Arabic system, which allows for the representation of any non-negative integer using ten fundamental digits. Numerals are used not only for counting but also for labeling, ordering, and coding. It is important to note that a numeral and the number it represents are often used interchangeably in everyday language.

Natural number: Natural numbers are positive integers used for counting, such as 1, 2, 3, and so on. They can sometimes include zero, and are distinct from negative numbers and fractions. The term 'counting numbers' may be used to distinguish them from other types of numbers.

Integer: An integer is a number that can be zero, positive, or negative. Negative integers are the opposites of positive integers. The entire group of integers is often represented with the symbol Z.

Negative number: A negative number in mathematics represents an opposite and is less than zero in the real number system. They are used to indicate losses or deficiencies, and can also represent debts or negative assets. Negative numbers describe values below zero on scales like Celsius and Fahrenheit. The laws of arithmetic for negative numbers reflect the concept of opposites, such as -(-3) being equal to 3.

Parity (mathematics): Parity in mathematics refers to the classification of an integer as even or odd. An even number is divisible by 2, while an odd number is not divisible. Some examples of even numbers are −4, 0, and 82, while odd numbers include −3, 5, 7, and 21.

Real number: Real numbers are mathematical entities used for measuring continuous quantities like distance, time, and temperature. They can have infinitely precise decimal representations, allowing for arbitrarily small differences between values.

Complex number: A complex number is an extension of the real numbers that includes an imaginary unit denoted as i. It can be expressed as a sum of a real part and an imaginary part. Complex numbers are considered as fundamental in mathematics and science, despite being termed "imaginary" historically. They play a crucial role in describing the natural world.

Rational number: A rational number is a number that can be expressed as a fraction of two integers. It includes integers and is denoted by Q.

Irrational number: Irrational numbers are real numbers that cannot be expressed as a fraction. Line segments with irrational ratios have no common measure, meaning their lengths cannot be expressed as integer multiples of a single length.

Imaginary number: An imaginary number is obtained by multiplying a real number with the imaginary unit "i" where i² = -1. The square of an imaginary number is always negative. Zero is considered both real and imaginary.

Order of operations: Order of operations refers to the rules followed in mathematics and computer programming to determine the sequence of operations performed when evaluating a mathematical expression. These rules dictate the priority of each operation to ensure accurate calculation.

Positional notation: 'Positional notation' is an extension of the Hindu-Arabic numeral system, where the value of a digit is determined by its position in the number. In contrast to ancient systems like Roman numerals, modern positional systems (such as the decimal system) assign different values to digits based on their position in the number string. For example, in the number 555, each digit represents different quantities of hundreds, tens, and units.

Numerical digit: A numerical digit is a symbol or combination of symbols used to represent numbers in a positional numeral system. The term "digit" originates from the correlation between the ten symbols of the base 10 numeral system and the ten digits of human hands.

Decimal: The decimal system is the standard way of representing both whole and fractional numbers, derived from the Hindu-Arabic numeral system. It is commonly referred to as decimal notation.

Arabic numerals: Arabic numerals (0-9) are widely used for writing numbers in a decimal system. They are also employed in other bases like octal and used for non-numerical purposes such as trademarks or license plates identifiers.

Roman numerals: Roman numerals originated in ancient Rome and were widely used in Europe until the Late Middle Ages. They consist of letters from the Latin alphabet that represent specific numerical values. The modern style is limited to seven letters for writing numbers.

Binary number: A binary number is a base-2 numeral system that uses only two symbols, 0 and 1, to express numbers.

Variable (mathematics): In mathematics, a variable is a symbol representing a mathematical object like a number, function, or set element. It can represent various mathematical entities, such as vectors, matrices, arguments, or sets, for the purpose of mathematical equations and expressions.

Function (mathematics): A mathematical function assigns each element of one set to a unique element of another set. The first set is called the domain, and the second set is called the codomain.

Inverse function: The inverse function is a mathematical function that reverses the operation of another function. It exists only if the original function is bijective, and is denoted as ''.

Implicit function: An implicit function is a mathematical relation written as where R is a function of multiple variables. It is used to describe equations without directly solving for one variable. The unit circle provides an example of an implicit equation, often represented by x^2 + y^2 = 1.

Function composition: Function composition is a mathematical operation that combines two functions to create a new function. It takes functions f and g and produces a function h = g ∘ f. The resulting function applies g to the result of applying f to x. It is denoted g ∘ f : X → Z and defined by (g ∘ f )(x) = g(f(x)) for all x in X. This allows for the relationship between the functions to be expressed in terms of mappings from one domain to another.

Graph of a function: A graph of a function is a set of ordered pairs that represent the relationship between inputs and outputs of the function. Typically represented as points on a plane, these pairs create a curve known as a plot.

Parametric equation: A parametric equation is a mathematical expression that defines quantities in terms of one or more parameters. It is commonly used to describe the coordinates of points on a curve or surface, known as a parametric curve or surface. These equations are referred to as a parameterization or parametric representation of the object.

Limit of a function: The limit of a function is a crucial concept in calculus and analysis that describes the behavior of the function near a specific input, whether or not it belongs to the function's domain.

Exponentiation: Exponentiation is a mathematical operation involving a base and an exponent. It is represented as bn, where b is the base and n is the power. When n is a positive integer, exponentiation is equivalent to repeated multiplication of the base.

Exponential function: The exponential function is a widely used mathematical function denoted by or . It is typically used to represent positive values of a real variable but can also be extended to complex numbers, matrices, and Lie algebras. It originated from the operation of taking powers of a number and can be defined for all real arguments, including irrational numbers. Due to its extensive use in various branches of mathematics, it is regarded as the most important function by mathematician Walter Rudin.

Logarithm: The logarithm is the inverse of exponentiation in mathematics. It calculates the exponent to which a given base must be raised to achieve a certain number. For example, log10 (1000) equals 3, as 1000 can be expressed as 10 raised to the power of 3. The logarithm is denoted as logb (x), and can also be written as logb x or log x when the base is implied or not important. It is commonly used in big O notation and has various applications in mathematical calculations.

nth root: In mathematics, the nth root is an operation that involves two numbers: the radicand (x) and the index (n). It is written as √x, where x is the radicand and n is the index. The nth root of a number x is a number r that, when raised to the power of n, equals x.

Square root: A square root is a mathematical term representing a number that, when multiplied by itself, equals a given number. For instance, 4 and -4 are square roots of 16.

Trigonometric functions: Trigonometric functions are real functions that relate angles of right-angled triangles to ratios of side lengths. They have widespread applications in geometry-based sciences like navigation, mechanics, and astronomy. Trigonometric functions are simple periodic functions and are often used in the study of periodic phenomena using Fourier analysis.

Hyperbolic functions: Hyperbolic functions are mathematical functions that are similar to trigonometric functions, but are defined using the hyperbola instead of the circle. They are represented by the points (cosh t, sinh t), which form the right half of the unit hyperbola. The derivatives of these functions, cosh(t) and sinh(t), are also related to each other, similar to how sin(t) and cos(t) are related.

Gamma function: The gamma function is a generalized version of the factorial function for complex numbers, excluding non-positive integers. It is defined for all complex numbers except for non-positive integers.

Factorial: The factorial is the product of all positive integers up to a given number. It is denoted by the exclamation mark (!). For a non-negative integer n, n! is equal to the product of n and all smaller positive integers.

Geometry: Geometry is a mathematical branch exploring space's properties like distance, shape, size, and relative position of figures. It is one of the oldest branches and encompasses Euclidean geometry, focusing on fundamental concepts like point, line, plane, angle, surface, and curve.

Coordinate system: A coordinate system is a system that uses numbers or coordinates to determine the position of points in geometry. The order of the coordinates matters, and they can be identified by their position or a letter. Coordinates can be real or complex numbers and are used to translate geometric problems into numerical problems. This is the basis of analytic geometry.

Cartesian coordinate system: A Cartesian coordinate system is a geometric system that uniquely identifies points with pairs of real numbers. These numbers represent the distances from two perpendicular lines known as axes. The system includes an origin at (0, 0).

Polar coordinate system: The polar coordinate system is a way to locate points on a plane using a distance from a reference point and an angle from a reference direction. The reference point is called the pole, and the distance is called the radial coordinate or radius. The angle is called the angular coordinate or polar angle. Angles are usually expressed in degrees or radians.

Dimension: In physics and mathematics, dimension refers to the number of coordinates needed to locate a point in a mathematical space. For example, a line is one-dimensional (1D) as it requires only one coordinate, while the surface of a cylinder or sphere is two-dimensional (2D) and requires two coordinates. A three-dimensional (3D) space, like the inside of a cube, cylinder, or sphere, requires three coordinates to locate a point within.

Point (geometry): A point in geometry represents an exact position without size in physical or mathematical spaces. It is the fundamental indivisible element of space, and can be determined by the intersection of curves or surfaces.

Line (geometry): A line in geometry is an idealized straight object that extends infinitely in both directions, with no width, depth, or curvature. It can be thought of as a one-dimensional space and may exist within higher-dimensional spaces. In everyday language, the term line can also refer to a part of a line that is bounded by two points, known as a line segment.

Curve: A curve is a mathematical object that can be likened to a non-straight line.

Euclidean plane: A Euclidean plane is a two-dimensional geometric space where a pair of real numbers determine the position of each point. It includes parallel lines and allows for the measurement of angles and the definition of circles based on distance metrics.

Plane (mathematics): A plane in mathematics is an infinite, flat two-dimensional space that is comparable to a point, line, or three-dimensional space.

Angle: An angle is a figure formed by two rays sharing a common endpoint. It can be formed in a plane or by the intersection of two planes. Angles can also be formed by intersecting curves. They are used to measure the separation or inclination between two lines or surfaces.

Right angle: A right angle is a 90-degree angle or /2 radians, representing a quarter turn. When a ray's endpoint is on a line and its adjacent angles are equal, it forms a right angle. The term originates from the Latin phrase angulus rectus, meaning "upright," referring to the vertical perpendicular to a horizontal base line.

Polygon: A polygon is a closed shape formed by connecting line segments together on a plane.

Triangle: A triangle is a three-sided polygon and one of the fundamental shapes in geometry. It consists of three corners (or vertices) and three sides (or edges). The interior of a triangle forms a two-dimensional region. The base, chosen arbitrarily, has an opposite vertex referred to as the apex.

Quadrilateral: A quadrilateral is a four-sided polygon with four edges and four corners. Its name comes from the Latin words quadri, meaning "four," and latus, meaning "side." It is also known as a tetragon, derived from Greek words meaning "four" and "corner," and as a quadrangle or 4-angle.

Square: A square is a regular quadrilateral with four equal sides and four equal angles. It can be seen as a rectangle with two equal-length adjacent sides. It has internal, central, and external angles of 90°, and its diagonals are all equal in length.

Conic section: A conic section is a curve formed when a plane intersects a cone's surface. The three main types are the hyperbola, parabola, and ellipse, with the circle considered a special case of the ellipse. Ancient Greek mathematicians extensively studied conic sections, with Apollonius of Perga being a significant contributor in understanding their properties.

Circle: A circle is a geometric shape formed by points in a plane equidistant from a center point called the radius.

Ellipse: An ellipse is a curved shape with two focal points, where the sum of the distances from any point on the curve to the focal points is constant. It is a generalized form of a circle, where the focal points are the same. The elongation of an ellipse is determined by its eccentricity, a numerical value.

Parabola: A parabola is a U-shaped plane curve that has mirror symmetry. It is defined by various mathematical descriptions which all represent the same curve.

Hyperbola: A hyperbola is a smooth curve in a plane, consisting of two mirror-image branches resembling infinite bows. It is formed by the intersection of a plane and a double cone, representing one of the three types of conic sections.

Three-dimensional space: A three-dimensional space refers to a mathematical space that requires three values to determine the position of a point. It is commonly known as the three-dimensional Euclidean space, which models physical space. It can also refer to a subset of space, a three-dimensional region, or a solid figure.

Shape: A shape is a visual representation of an object's form or external boundary, separate from qualities like color or texture. It pertains solely to the object's structure and does not consider its location, size, orientation, or reflection. A figure, on the other hand, encompasses both shape and size.

Sphere: A sphere is a three-dimensional object, similar to a circle in two dimensions. It consists of all points that are equidistant from a central point, called the center, with a radius denoting the distance. Spheres have been mentioned by ancient Greek mathematicians.

Polyhedron: A polyhedron is a 3D shape made up of flat faces, straight edges, and sharp corners.

Cube: A cube is a 3D shape with six square faces. It has three squares meeting at each corner and its net resembles a cross.

Trigonometry: Trigonometry is a branch of math that studies the relationships between angles and side lengths of triangles. It emerged during the 3rd century BC from geometry's application in astronomy. Trigonometric functions, like sine, use ratios of side lengths to calculate angles in right triangles. Ancient Greeks calculated chords, while Indian mathematicians developed early trigonometric tables.

Topology: Topology is a branch of mathematics that studies the properties of objects that remain unchanged under continuous deformations like stretching, bending, and twisting. It focuses on preserving shape without tearing, gluing, or passing through itself.

General topology: General topology is a fundamental branch of mathematics that explores set theory and the foundational aspects used in topology. It serves as the basis for various other branches like differential topology, geometric topology, and algebraic topology.

Topological space: A topological space is a geometrical space where closeness is defined without numeric distances. It consists of a set of points and a topology that defines neighborhoods satisfying axioms of closeness. The most common definition is through open sets, which is more easily manipulated.

Compact space: Compact space is a mathematical concept that generalizes closed and bounded subsets. It includes all limiting values of points and has no "punctures" or "missing endpoints". For instance, the open interval (0,1) is not compact because it excludes the limiting values of 0 and 1. On the other hand, the closed interval [0,1] is compact. The concept can be made precise in various ways, typically agreeing in metric spaces but not always in other topological spaces.

Manifold: A manifold is a mathematical concept representing a space that locally resembles Euclidean space near each point. It is a topological space where every point has a neighborhood that is similar to an open subset of Euclidean space.

Open set: An open set is a mathematical concept that extends the idea of an open interval in the real line. It encompasses sets where every point has a neighborhood entirely contained within the set.

Homology (mathematics): Homology in mathematics associates algebraic objects with other mathematical objects, like topological spaces. Originally defined in algebraic topology, it is now used in diverse contexts such as abstract algebra, groups, Lie algebras, Galois theory, and algebraic geometry.

Homotopy: Homotopy is a concept in topology, a branch of mathematics. It involves the continuous deformation of one function into another within a topological space. This deformation is known as a homotopy. Homotopy is used to define important invariants called homotopy groups and cohomotopy groups in algebraic topology.

Euler characteristic: The Euler characteristic is a mathematical concept that measures the shape or structure of a topological space, regardless of how it is distorted. It is a topological invariant and is often denoted by .

Knot theory: Knot theory is the mathematical study of knots, which are formed by joining the ends of a closed loop. It differs from everyday knots by being unable to be undone. Knots are represented as circles embedded in 3-dimensional space. Equivalent knots can be transformed into each other without cutting or passing the string through itself.

Poincaré conjecture: The Poincaré conjecture is a mathematical theorem regarding the description of a 3-dimensional hypersphere known as the 3-sphere. It deals with the boundaries of a unit ball in four-dimensional space.

Area: Area is a measure of size on a surface. It can refer to the size of a shape or the boundary of a three-dimensional object. It represents the amount of material or paint needed to cover a surface. Area is the two-dimensional equivalent of length or volume.

Volume: Volume is a numerical measure of three-dimensional space using SI or imperial units. It is related to length cubed and represents the capacity of a container. Additionally, the term "volume" can also refer to the corresponding region.

Length: Length is a quantifiable distance, with the base unit in the SI system being the meter. It serves as the foundation for other units of measurement.

Distance: Distance is a measure of the separation between objects or points, either in terms of physical length or based on other criteria. It can also represent the difference or degree of separation between similar objects. Mathematics formalizes distance using the concept of a metric space.

Metric space: A metric space is a mathematical concept that defines distance between points in a set. It is used to study mathematical analysis and geometry.

Euclidean geometry: Euclidean geometry, attributed to Euclid, is a mathematical system described in his textbook Elements. It is based on intuitively appealing axioms, from which numerous theorems are deduced. Euclid is recognized as the first to organize these propositions into a logical system with rigorous proofs.

Convex set: A convex set is a subset of a space that contains the line segment between any two points within the set. It is characterized by intersecting any line into a single line segment.

Pythagorean theorem: The Pythagorean theorem is a key concept in math that relates the sides of a right triangle. It states that the sum of the areas of the squares on the two shorter sides is equal to the area of the square on the longest side.

Non-Euclidean geometry: Non-Euclidean geometry is a branch of mathematics that encompasses two geometries related to Euclidean geometry. It involves either replacing the parallel postulate or relaxing the metric requirement. Hyperbolic and elliptic geometries are traditional non-Euclidean geometries obtained through replacing the parallel postulate. Relaxing the metric requirement leads to kinematic geometries associated with affine planes.

Symmetry: Symmetry refers to harmonious and balanced proportion. In mathematics, it specifically describes objects that remain unchanged under transformations like translation, reflection, rotation, or scaling. The term's everyday and mathematical meanings are interconnected and explored in this article.

Symmetry in mathematics: Symmetry in mathematics refers to the property of a mathematical object remaining unchanged under operations or transformations. It is not limited to geometry but is found in various branches of mathematics.

Analytic geometry: Analytic geometry, also called coordinate or Cartesian geometry, is a mathematical study that uses a coordinate system to analyze geometry. It differs from synthetic geometry.

Differential geometry: Differential geometry is a branch of mathematics that explores the geometry of smooth shapes and spaces called smooth manifolds. It draws techniques from differential calculus, integral calculus, linear algebra, and multilinear algebra. Its origins lie in the study of spherical geometry and later expanded to include astronomy, geodesy, and hyperbolic geometry. The field developed during the 18th and 19th centuries, primarily by studying plane and space curves and surfaces in three-dimensional Euclidean space.

Riemannian geometry: Riemannian geometry studies smooth manifolds with a Riemannian metric. It provides local measures of angles, length, surface area, and volume. It also allows for deriving global quantities by integrating local contributions.

Fractal: A fractal is a mathematical shape that shows intricate patterns at all levels of magnification, with a dimension surpassing its topological dimension. These self-similar shapes exhibit similar details as they are zoomed in, and if the replication is identical at every scale, it is known as affine self-similar. Fractal geometry is a part of measure theory in mathematics.

Tessellation: Tessellation, or tiling, is the process of covering a surface (often a plane) using geometric tiles without any overlaps or gaps. This mathematical concept can also be applied to higher dimensions and various geometries.

Algebra: Algebra is the math study of variables and their manipulation in formulas, originating from ancient Babylonian methods. It has become an integral part of various mathematical disciplines.

Elementary algebra: Elementary algebra, also called college algebra, covers fundamental algebraic concepts. It differs from arithmetic by introducing variables instead of working with specific numbers.

Quadratic equation: A quadratic equation is an algebraic equation that can be rearranged into standard form. It is characterized by having a variable raised to the power of 2 and includes terms of lower powers.

Linear algebra: Linear algebra is a mathematical branch studying linear equations. It deals with matrices, vectors, and linear transformations.

Linear equation: A linear equation is a mathematical equation that consists of variables and coefficients. The variables are typically represented by letters, while the coefficients are usually real numbers. The equation must have at least one nonzero coefficient to be meaningful. The coefficients can be considered as parameters and can be any arbitrary expressions, as long as they do not contain the variables.

Gaussian elimination: Gaussian elimination, also known as row reduction, is a mathematical algorithm used to solve systems of linear equations. It involves performing row-wise operations on a coefficient matrix to reach a matrix with zeros in the lower left-hand corner. This method can also be used to find the rank, determinant, and inverse of a matrix. The algorithm is named after Carl Friedrich Gauss and uses three types of elementary row operations: swapping rows, multiplying a row by a nonzero number, and adding a multiple of one row to another row.

Matrix (mathematics): In math, a matrix is a rectangular arrangement of numbers or symbols organized in rows and columns. It represents mathematical objects or their properties.

Determinant: The determinant is a scalar value that characterizes a square matrix and the linear map it represents. It is denoted as det(A) or |A|. The determinant is nonzero if the matrix is invertible and the linear map is an isomorphism. The determinant of a product of matrices is the product of their determinants.

Eigenvalues and eigenvectors: Eigenvalues and eigenvectors refer to special vectors that remain unchanged, except for scaling, when a linear transformation is applied to them. The eigenvector gets multiplied by a constant factor known as the eigenvalue, which represents the scaling factor.

Vector space: A vector space is a set of vectors that can be added and scaled by numbers. Scalars can be real numbers, complex numbers, or elements of any field. Vector addition and scalar multiplication must satisfy certain requirements. There are different types of vector spaces based on the kind of scalars used.

Euclidean vector: A Euclidean vector is a geometric object representing magnitude and direction. It can be added to other vectors using vector algebra. Typically represented by a directed line segment or arrow, it is denoted as 'A→B'.

Cross product: The cross product is a vector operation between two vectors in a three-dimensional space. It results in a vector perpendicular to the two input vectors and finds applications in various fields such as mathematics, physics, engineering, and computer programming. It is different from the dot product.

Dot product: The dot product is a mathematical operation that combines two sequences of numbers into a single number. It is commonly used in Euclidean geometry to calculate the inner product of vectors. Note that there are other inner products possible in Euclidean space.

Tensor: A tensor is an algebraic object describing relationships between sets of algebraic objects in a vector space. It can map between different objects such as vectors and scalars. Tensors include scalars, vectors, dual vectors, and multilinear maps. They are defined independently of any basis but are often represented by components in a coordinate system. Tensors can be thought of as high-dimensional matrices.

Algebraic topology: Algebraic topology applies abstract algebra to study topological spaces, aiming to find algebraic invariants that classify these spaces up to similarity. It focuses on determining classifications up to both homeomorphism and homotopy equivalence.

Sheaf (mathematics): A sheaf is a mathematical concept used to track data associated with open sets in a topological space. It allows for local definitions of data, which can be restricted to smaller open sets. The data assigned to an open set is equivalent to compatible data assigned to collections of smaller open sets covering the original open set.

Associative property: The associative property in mathematics states that changing the grouping of terms in an expression does not alter its result. In propositional logic, associativity is a valid rule for replacing expressions in logical proofs.

Commutative algebra: Commutative algebra is a branch of algebra that explores commutative rings, their ideals, and modules over such rings. It serves as a foundation for algebraic geometry and algebraic number theory. Notable examples of commutative rings include polynomial rings, rings of algebraic integers (including ordinary integers), and p-adic integers.

Commutative property: The commutative property in mathematics states that changing the order of operands does not change the result of a binary operation. It is a fundamental property used in arithmetic and other advanced settings. Operations like division and subtraction do not have this property and are called noncommutative. The commutative property was named in the 19th century when math started getting formalized. It also exists in binary relations as symmetry, where the order of operands doesn't affect the relation's validity.

Distributive property: The distributive property is a mathematical concept that extends the distributive law. It states that when operations are performed on two values, the result will be the same whether the operations are performed individually or together.

Field (mathematics): In mathematics, a field is a set where addition, subtraction, multiplication, and division are defined, similar to rational and real numbers. It is a fundamental algebraic structure used extensively in various mathematical disciplines like algebra and number theory.

Fundamental theorem of algebra: The fundamental theorem of algebra states that every non-constant polynomial with complex coefficients has at least one complex root. This applies to both polynomials with real coefficients and those with imaginary parts equal to zero.

Galois theory: Galois theory is a mathematical theory by Évariste Galois that links field theory and group theory. It simplifies and enhances our understanding of field theory problems by reducing them to group theory using the fundamental theorem of Galois theory.

Group (mathematics): A group in mathematics is a set with an operation that is associative and has an identity element. It also requires that every element in the set has an inverse element.

Abelian group: An Abelian group is a commutative group, where the order of applying the group operation doesn't matter. Examples include the integers and real numbers under addition. It is named after mathematician Niels Henrik Abel.

Classification of finite simple groups: The classification of finite simple groups is a fundamental result in group theory. It states that every finite simple group can be categorized as cyclic, alternating, a group of Lie type, or one of a few sporadic exceptions. The proof for this classification spans tens of thousands of pages in hundreds of articles written by about 100 authors over the course of almost 50 years.

Fundamental group: The fundamental group of a topological space is a group that captures information about the shape and holes of the space. It consists of equivalence classes of loops under homotopy. The fundamental group is a homotopy invariant and is denoted by .

Group representation: Group representation in mathematics refers to the way abstract groups are described using linear transformations of a vector space. This representation allows group elements to be represented by invertible matrices, enabling the group operation to be represented through matrix multiplication.

Group theory: Group theory is a branch of abstract algebra that studies the algebraic structures called groups. It is central to abstract algebra and influences other algebraic structures like rings, fields, and vector spaces. The methods of group theory have influenced various parts of algebra, including linear algebraic groups and Lie groups.

Homological algebra: Homological algebra is a branch of mathematics that studies homology in a broader algebraic context. It originated from the research of Poincaré and Hilbert in the late 19th century, combining combinatorial topology and abstract algebra.

Isomorphism: An isomorphism is a structure-preserving mapping between two mathematical structures of the same type. It can be reversed by an inverse mapping. If an isomorphism exists, the two structures are considered isomorphic. The term is derived from Ancient Greek, meaning "equal form".

Module (mathematics): A module is a mathematical generalization of a vector space, where a ring replaces the field of scalars. It also extends the concept of an abelian group, as abelian groups are modules over the ring of integers.

Representation theory: Representation theory is a mathematical branch that represents elements of abstract algebraic structures as linear transformations. It also analyzes modules over these structures. By using matrices and linear algebra operations, representations make abstract objects more understandable, allowing for easier property analysis and sometimes simplifying abstract theories calculations.

Ring theory: Ring theory is the study of algebraic structures called rings, which have properties similar to those of integers. It explores the structure, representations, and properties of rings, including modules and special ring classes. This theory is useful for understanding homological properties and polynomial identities.

Commutative ring: A commutative ring is a mathematical structure where multiplication is commutative. It is studied in commutative algebra, which focuses on properties unique to commutative rings. In contrast, noncommutative algebra explores properties that do not extend to noncommutative rings.

Ring (mathematics): A ring is a mathematical structure that extends the concept of field, allowing for non-commutative multiplication and the absence of multiplicative inverses. It consists of a set with two operations resembling addition and multiplication. Rings can include numeric objects like integers and complex numbers, as well as non-numeric entities like polynomials, matrices, functions, and power series.

Algebraic geometry: Algebraic geometry uses abstract algebra to solve geometric problems by studying zeros of multivariate polynomials. The modern approach generalizes this by incorporating aspects from commutative algebra.

Algebraic variety: An algebraic variety is the main focus in algebraic geometry. It represents the set of solutions to a system of polynomial equations. Modern definitions aim to extend this concept while retaining its geometric intuition.

Inequality (mathematics): In mathematics, inequality is a relation that compares two numbers or expressions in terms of their size. It is commonly used to compare numbers on the number line. Notations include "<" for less than and ">" for greater than.

Statistics: Statistics is the study of collecting, organizing, analyzing, interpreting, and presenting data. It is used to address scientific, industrial, or social issues, and involves studying populations or models. It encompasses all aspects of data, including survey and experiment design.

Bayesian inference: Bayesian inference is a statistical method that uses Bayes' theorem to update the probability of a hypothesis as more evidence is gathered. It relies on prior knowledge and a prior distribution to estimate posterior probabilities. This technique is widely used in various fields, including science, engineering, medicine, and law. Bayesian inference is closely linked to subjective probability and is crucial for analyzing sequential data.

Correlation: Correlation refers to the statistical relationship between two random variables or data. It measures the degree of linear association between variables. Examples of correlation include the height of parents and their offspring, and the relationship between price and consumer demand.

Regression analysis: Regression analysis is a statistical tool used to estimate the relationship between a dependent variable and independent variables. The most common method is linear regression, which finds the line that best fits the data. Ordinary least squares is a popular technique that minimizes the differences between the data and the line. This allows researchers to estimate the dependent variable's expected value given specific values of the independent variables. Regression can also estimate alternative location parameters and the conditional expectation across non-linear models.

Ordinary least squares: Ordinary least squares (OLS) is a statistical method for estimating unknown parameters in a linear regression model. It minimizes the sum of squared differences between the observed dependent variable and the predicted value based on the linear relationship with the independent variable.

Data and information visualization: Data and information visualization is the creation of visual representations that make complex data easy to understand. These visuals can be static, dynamic, or interactive and are based on expertise in a particular field. They help a broad audience explore and gain insights from the data by highlighting patterns, trends, and relationships. When used to present known information in a clear and engaging way, it is called information graphics.

Design of experiments: Design of experiments refers to the planning and arrangement of tasks that aim to understand and describe the variation of information under specific conditions. It is commonly used in experiments where conditions directly influence this variation, but can also include observational studies of natural conditions that impact the variation.

Randomized controlled trial: A Randomized Controlled Trial (RCT) is a scientific experiment that compares the effects of different treatments. It is commonly used in clinical trials to control variables not directly manipulated by researchers. RCTs assess the effectiveness of drugs, surgical techniques, medical devices, diagnostic procedures, and other medical treatments.

Mean: A mean is a numerical value that represents the center of a set of numbers. It helps summarize data and understand the overall value of a dataset.

Median: The median is a statistical measure that represents the middle value of a dataset or distribution. It is not influenced by extreme values, making it a more accurate measure of center. Median income is a better indicator of the center of income distribution as it is not affected by the highest incomes. Overall, the median is a key concept in statistics, providing robustness in data analysis.

Meta-analysis: Meta-analysis is the statistical combination of multiple studies on a similar topic. It involves calculating an effect size by extracting data from different studies. Meta-analyses contribute to research proposals, treatment guidelines, and health policies. They summarize existing research and guide future studies, making them crucial in metascience. They are often part of systematic reviews, for example, in clinical trials to evaluate the effectiveness of medical treatments.

Mode (statistics): The mode in statistics refers to the most common value in a set of data. For a discrete random variable, it represents the value with the highest probability mass function. Simply put, it is the value that is most likely to be selected or sampled.

Observational study: Observational studies are conducted in fields like epidemiology, social sciences, psychology, and statistics. They involve drawing conclusions from a sample to a larger population. These studies are done when the researcher cannot control the independent variable due to ethical or logistical reasons. One common type of observational study looks at the impact of a treatment on subjects, where the assignment of subjects to treated or control groups is not controlled by the researcher. This is different from experiments, where subjects are randomly assigned to groups. Due to the lack of control over assignment, observational studies pose challenges for inferential analysis.

Sample mean and covariance: The sample mean and covariance are statistical measures calculated from a dataset representing random variables. They provide insights into the average and relationship of the variables.

Standard deviation: Standard deviation measures the amount of variation expected in a random variable around its mean. A low value suggests values closer to the mean, while a high value indicates a wider range of values.

Standard error: The standard error (SE) is the standard deviation of a statistic's sampling distribution or an estimate of that. When the statistic is the sample mean, it is referred to as the standard error of the mean (SEM). The standard error is crucial for creating confidence intervals.

Statistical hypothesis testing: Statistical hypothesis testing is a technique to determine if data supports a hypothesis. It allows for making probabilistic statements about population parameters and involves making decisions under uncertainty. The process involves selecting a tradeoff between false positives and false negatives.

p-value: The p-value is a measure used in statistical testing to determine the probability of obtaining results as extreme as the observed result, assuming the null hypothesis is true. A low p-value indicates that the observed outcome would be unlikely under the null hypothesis. However, the misuse and misinterpretation of p-values are common and have been widely discussed. The American Statistical Association (ASA) stated that p-values do not measure the probability of a hypothesis being true or the importance of a result. Nevertheless, when properly applied and interpreted, p-values and significance tests enhance the rigor of conclusions drawn from data, as emphasized by a 2019 ASA task force.

Chi-squared test: A chi-squared test is a statistical test used to analyze contingency tables with large sample sizes. It determines whether two categorical variables are independent. The test examines if there is a significant difference between expected and observed frequencies in a contingency table. For smaller sample sizes, Fisher's exact test is used.

Student'st-test: The Student's t-test is a statistical hypothesis test used to assess if the difference between the response of two groups is statistically significant. It is applicable when the test statistic follows a Student's t-distribution and is commonly used to compare means of two populations. In certain scenarios, a t-test and a Z-test yield similar results as the dataset size grows.

Survey methodology: 'Survey methodology' is the study of techniques used in gathering data through surveys. It focuses on sampling, questionnaire design, and strategies for increasing response accuracy. This field explores methods to improve the quality and quantity of survey data.

Statistical population: A statistical population is a set of similar items or events that are of interest for a question or experiment. It can be a group of existing objects or a hypothetical, potentially infinite group based on experience. Statistical analysis aims to gather information about a chosen population.

Sampling (statistics): Sampling in statistics is the process of selecting a subset of individuals from a population to estimate characteristics of the entire population. Statisticians aim to collect representative samples to save time and cost compared to surveying the entire population. It provides valuable insights when surveying the whole population is impractical.

Probability: Probability is a mathematical concept that measures the likelihood of events occurring. It is represented by a number between 0 and 1, where higher numbers indicate greater chances of an event happening. For example, when tossing a fair coin, the probability of landing on either heads or tails is equal at 1/2.

Probability theory: Probability theory is a mathematical branch dealing with the concept of probability. It uses a set of strict axioms to express probability and assigns a probability measure to a set of outcomes, known as the sample space. Events are subsets of the sample space in which probability is calculated.

Bayes' theorem: Bayes' theorem is a mathematical tool used in probability theory and statistics to determine the probability of an event based on prior knowledge. It takes into account conditions that may be related to the event, allowing for more accurate assessments. For instance, it helps assess an individual's health risk by considering their age, rather than assuming they represent the entire population.

Central limit theorem: The central limit theorem (CLT) states that the distribution of the sample mean approaches a normal distribution, regardless of the original variables' distribution, under certain conditions. Different versions of the CLT apply depending on the circumstances.

Law of large numbers: The Law of Large Numbers (LLN) is a mathematical theorem stating that if a large number of independent and identical random samples are taken, their average will converge to the true value. Specifically, the LLN states that for a sample of independent and identically distributed values, the sample mean will converge to the true mean.

Expected value: The expected value is a concept in probability theory that calculates the average value of a random variable. It considers all possible outcomes, weighted by their probabilities. The expected value may not be present in the actual data set and can differ from what is expected in reality.

Variance: Variance measures the spread of numbers in a dataset from their average value. It is obtained by calculating the squared deviation from the mean. The standard deviation is the square root of the variance. Variance is a central moment in probability theory, and it can be represented by various symbols.

Probability distribution: A probability distribution is a mathematical function that assigns probabilities to different outcomes in an experiment. It describes a random phenomenon using the sample space and the probabilities of events.

Probability density function: A probability density function (PDF) is a function that measures the relative likelihood of a continuous random variable taking on a specific value. It provides the probability per unit length and allows us to compare the likelihood of the variable being close to different values.

Exponential distribution: The exponential distribution is a probability distribution that represents the distance between events in a continuous and independent process occurring at a constant average rate. It is a special case of the gamma distribution and the continuous analogue of the geometric distribution. Its key feature is being memoryless. It is widely used for analyzing Poisson point processes and found in various other contexts.

Normal distribution: A normal distribution, also known as Gaussian distribution, is a continuous probability distribution for a real-valued random variable. It exhibits a symmetric bell curve shape in which data is centered around the mean. The probability density function of a normal distribution is commonly used in statistics.

Binomial distribution: The binomial distribution is a probability distribution that models the number of successes in a fixed number of independent experiments. Each experiment has a yes or no outcome, and the distribution is used for statistical tests of significance.

Discrete uniform distribution: The discrete uniform distribution is a symmetric probability distribution where a finite number of equally likely values can be observed. Each value has an equal probability of 1/n. In other words, it represents a known, finite number of outcomes that are equally likely to occur.

Poisson distribution: The Poisson distribution is a discrete probability distribution that calculates the likelihood of a specific number of events happening within a fixed time or space, assuming a constant mean rate and independence from previous events. It is named after mathematician Siméon Denis Poisson and is also applicable to distances, areas, and volumes. The distribution is significant in discrete-stable distributions.

Random variable: A random variable is a mathematical representation of a quantity influenced by random events. It is not truly random nor a variable, but a function mapping possible outcomes to measurable spaces, often real numbers.

Stochastic process: A stochastic process is a sequence of random variables in a probability space, often representing variables changing over time. It is widely used as a mathematical model to study systems and phenomena that seem to vary randomly, such as population growth, electrical fluctuations, or gas molecule movement. These processes have applications in various fields including biology, physics, finance, and computer science.

Markov chain: A Markov chain is a stochastic model where the probability of each event only depends on the previous state. It can be discrete-time (moves in discrete steps) or continuous-time. Named after mathematician Andrey Markov.

Mathematical logic: Mathematical logic, a study within mathematics, explores formal logic. It encompasses model theory, proof theory, set theory, and recursion theory. Research focuses on properties of logical systems, their deductive power, and their use in characterizing correct mathematical reasoning and establishing foundations of mathematics.

Axiom: An axiom, postulate, or assumption is a true statement used as a starting point for reasoning. It is derived from the Greek word ἀξίωμα, meaning 'that which is thought worthy or fit'.

Propositional calculus: Propositional calculus, also known as propositional logic or statement logic, is a branch of logic that deals with propositions and their relations. It involves creating arguments based on these propositions and connecting them using logical connectives. Atomic propositions are those that contain no logical connectives.

Boolean algebra: Boolean algebra is a branch of mathematics and logic that uses truth values (true and false) instead of numbers. It employs logical operators like conjunction (and), disjunction (or), and negation (not) to describe logical operations. This formal system is distinct from elementary algebra, which deals with numerical operations.

First-order logic: First-order logic, or predicate logic, is a formal system used in various fields. It allows quantified variables and sentences with variables, enabling more complex expressions. Unlike propositional logic, it uses quantifiers and relations. Propositional logic serves as the basis for first-order logic.

Set theory: Set theory is a field of mathematical logic that examines sets, defined as collections of objects. It focuses on relevant sets in mathematics as a whole.

Naive set theory: Naive set theory is an informal approach to understanding mathematical sets. It is described in natural language rather than formal logic. It covers familiar concepts of sets and is sufficient for everyday use in mathematics.

Russell's paradox: Russell's paradox is a set-theoretic paradox discovered by Bertrand Russell in 1901. It demonstrates that all set theories with unrestricted comprehension principles result in contradictions. Ernst Zermelo also independently found the paradox in 1899 but did not publish it. This knowledge was limited to David Hilbert, Edmund Husserl, and others at the University of Göttingen. Georg Cantor, the founder of modern set theory, had foreseen this contradiction in his theory and informed Hilbert and Richard Dedekind.

Venn diagram: A Venn diagram is a diagram style devised by John Venn in the 1880s to illustrate the logical relation between sets. It uses closed curves, often circles or ellipses, to represent sets. Venn diagrams are widely used in various fields like set theory, probability, logic, statistics, linguistics, and computer science. They serve as a teaching tool for elementary set theory and depict simple set relationships.

Set (mathematics): A set in mathematics is a collection of different elements, which can be numbers, symbols, shapes, or even other sets. It can be finite or infinite, and may contain no elements or just one element.

Empty set: The empty set in mathematics is a set with no elements, represented by {}. It has a size of zero and is a fundamental concept in set theory. Some set theories include an axiom to ensure the existence of the empty set, while in others, it can be deduced. The empty set satisfies certain properties by default.

Intersection (set theory): Intersection in set theory, denoted by ∩, is the set that contains elements shared by two sets A and B. It represents the common elements between A and B.

Subset: In mathematics, a subset is a set that contains only elements also found in another set. The term "inclusion" describes the relationship where one set is a subset of another. A proper subset is when two sets are unequal, and one completely contains the other. A k-subset is a subset with k elements.

Union (set theory): The union in set theory combines sets by including all their elements. It is a fundamental operation that allows sets to be related and combined. A nullary union, representing no sets, is equal to the empty set.

Equivalence relation: An equivalence relation is a reflexive, symmetric, and transitive binary relation in mathematics. It can be seen in the equipollence relation between line segments in geometry. Equality is a simpler example, where any number is equal to itself (reflexive), and if a equals b, then b equals a (symmetric) and if a equals b and b equals c, then a equals c (transitive).

Cantor's theorem: Cantor's theorem in set theory states that for any set, the set of all its subsets has a higher cardinality than the original set itself. It establishes the existence of infinite levels of infinity within set theory.

Axiom of choice: The axiom of choice is a fundamental principle in set theory. It states that for any collection of sets, even if infinite, it is possible to select one element from each set and form a new set. This axiom, formulated in 1904 by Ernst Zermelo, is equivalent to the statement that the Cartesian product of non-empty sets is non-empty.

Mathematical induction: Mathematical induction is a method to prove that a statement is true for every natural number. It involves first proving a simple case and then showing that if the claim holds for a given case, it also holds for the next case. It can be compared to falling dominoes or climbing a ladder, showing that we can climb as high as we want by starting from the bottom rung and being able to climb up from each rung to the next.

Computability theory: Computability theory, also called recursion theory, emerged in the 1930s to study computable functions and Turing degrees. It is a branch of mathematics, computer science, and the theory of computation. Today, it encompasses the investigation of generalized computability, definability, and overlaps with proof theory and effective descriptive set theory.

Computable function: Computable functions are the fundamental objects in computability theory, representing algorithms that can process inputs and produce outputs. They allow for the study of computability without relying on specific computational models like Turing machines or register machines. Two notable models, Turing-computable functions and general recursive functions, are used to define the set of computable functions.

Gödel's incompleteness theorems: Gödel's incompleteness theorems, discovered by Kurt Gödel in 1931, reveal the limits of provability in formal axiomatic theories. They have significant implications in both mathematical logic and the philosophy of mathematics. These theorems challenge Hilbert's program of finding a complete and consistent set of axioms for all of mathematics.

Category theory: Category theory is a mathematical theory that studies structures and their relationships. It was introduced by Eilenberg and Mac Lane in the mid-20th century. This theory is widely used in various areas of mathematics to express and unify constructions of new objects, such as quotient spaces and direct products, across different contexts. It provides a powerful tool for understanding and organizing mathematical concepts.

Discrete mathematics: Discrete mathematics is the study of mathematical structures that are separate and distinct. It focuses on integers, graphs, and logic statements while excluding continuous topics like real numbers and calculus. It deals with countable sets but lacks a specific definition.

Combinatorics: Combinatorics is a branch of mathematics that deals with counting and understanding properties of finite structures. It has applications in various fields such as logic, statistical physics, evolutionary biology, and computer science.

Combination: A combination in mathematics is a selection of items from a set where the order doesn't matter. For example, choosing two fruits from a set of apples, oranges, and pears gives three possible combinations. A k-combination of a set is a subset of k distinct elements. The number of k-combinations, denoted by , is equal to the binomial coefficient.

Permutation: In mathematics, a permutation is the arrangement or rearrangement of elements in a set's linear order. It can also refer to the process of changing the order of an already-ordered set.

Graph theory: Graph theory is the mathematical study of graphs, which are structures used to model relationships between objects. Graphs consist of vertices connected by edges, with undirected graphs having symmetrical connections and directed graphs having asymmetrical connections. They are a fundamental subject in discrete mathematics.

Graph (discrete mathematics): A graph, in discrete mathematics, is a set of objects with some connections between them. The objects are known as vertices and the connections as edges. Graphs are depicted as dots connected by lines or curves. They are studied in the field of discrete mathematics.

Calculus: Calculus is the mathematical study of continuous change, similar to how geometry studies shape and algebra studies generalizations of arithmetic operations.

Limit (mathematics): A limit is a value that a function approaches when its input approaches a specific value. It is crucial in calculus and mathematical analysis as it defines continuity, derivatives, and integrals.

Fundamental theorem of calculus: The fundamental theorem of calculus connects differentiation and integration. These operations are essentially inverse, except for a constant value determined by the starting point in measuring area.

Continuous function: A continuous function is a function where small changes in the input cause small changes in the output. It does not have abrupt changes in value, called discontinuities. In the past, mathematicians only considered continuous functions, but the definition of continuity was formalized in the 19th century using the epsilon-delta definition of a limit.

Differential calculus: Differential calculus is a branch of mathematics that examines how quantities change over time. It is part of calculus, along with integral calculus—the study of the area under curves.

Derivative: The derivative is a fundamental tool in calculus that measures how a function's output changes with respect to its input. It gives the slope of the tangent line to the function's graph at a specific point. This tangent line provides the best linear approximation of the function near that point. The derivative is known as the instantaneous rate of change, representing the ratio of the instantaneous change in the dependent variable to the independent variable. The process of obtaining a derivative is called differentiation.

Integral: Integral is a mathematical concept used to calculate areas, volumes, and more. It is one of the fundamental operations of calculus, alongside differentiation. Initially used for finding areas and displacements, integration is now widely applied in scientific fields.

Numerical integration: Numerical integration is a collection of algorithms used to calculate the numerical value of a definite integral. It is sometimes referred to as numerical quadrature, particularly for one-dimensional integrals. Cubature is the term used for numerical integration in more than one dimension, and "quadrature" can encompass higher-dimensional integration as well.

Multivariable calculus: Multivariable calculus is the study of calculus applied to functions with multiple variables. It involves differentiating and integrating functions with several variables, rather than just one.

Vector calculus: Vector calculus, also known as vector analysis, is an advanced mathematical subject with practical applications in physics and engineering. It involves differentiating and integrating vector fields in 3-dimensional space. It is closely related to multivariable calculus, including partial differentiation and multiple integration. Vector calculus plays a significant role in differential geometry and the study of partial differential equations. It finds extensive use in describing electromagnetic and gravitational fields, as well as fluid flow.

Multiple integral: A multiple integral is a type of definite integral in multivariable calculus. It involves integrating a function that depends on several real variables. It can be used to calculate various physical quantities such as surface area and volume. The variables in the function can represent time, position, and other factors.

Partial derivative: A partial derivative is the derivative of a function with respect to one variable while keeping the others constant. It is an essential tool in vector calculus and differential geometry.

Del: Del (∇) is a vector differential operator in mathematics, commonly used to represent the gradient, divergence, or curl of a field. It can also denote the standard derivative of a one-dimensional function.

Laplace's equation: Laplace's equation, a second-order partial differential equation, is named after Pierre-Simon Laplace. It describes important properties in mathematics and physics.

Differential equation: A differential equation relates unknown functions and their derivatives. It defines the relationship between physical quantities and their rates of change. These equations are essential in various fields such as engineering, physics, economics, and biology.

Ordinary differential equation: An ordinary differential equation (ODE) is a mathematical equation with a single independent variable, involving the derivatives of one or more functions. It is distinct from partial differential equations, which involve multiple independent variables.

Partial differential equation: A partial differential equation (PDE) is a mathematical equation that relates partial derivatives of a function with respect to multiple variables. It is used to compute the function's behavior in terms of its derivatives.

Dynamical systems theory: Dynamical systems theory is a mathematical framework that studies the behavior of complex systems using differential equations or difference equations. It encompasses continuous dynamical systems, which generalize classical mechanics and do not adhere to the least action principle, and discrete dynamical systems. Time scales and mixed operators may also be considered in some cases.

Dynamical system: A dynamical system is a mathematical model that describes the time evolution of a point in a space. It can represent various phenomena like pendulum swinging, water flow, particle motion, and population growth. This concept combines different mathematical concepts such as differential equations and ergodic theory. Time can be measured in various ways, and the space can be a set or a manifold, with or without a smooth structure.

Chaos theory: Chaos theory is an interdisciplinary scientific study that focuses on patterns and laws of highly sensitive and complex systems. It reveals underlying patterns, interconnections, and self-organization within seemingly random states. The butterfly effect, a key principle, highlights how a small change in one state can lead to significant effects later on. Metaphorically, a butterfly flapping its wings can cause a tornado in a different location.

Sequence: A sequence in mathematics is a collection of objects with order and potential repetitions. It is defined as a function from natural numbers to the elements at each position. Repetition of elements and the order of the sequence matter. The concept can be extended to include an arbitrary index set.

Limit of a sequence: The limit of a sequence is the value that the terms tend to, denoted by a symbol. If the limit exists, the sequence is convergent, otherwise it is divergent. It is a fundamental concept in mathematical analysis.

Series (mathematics): A series in mathematics involves adding an infinite number of quantities to a starting quantity. It is a significant topic in calculus and mathematical analysis. Series are utilized in various areas of mathematics and are also extensively applied in disciplines like physics, computer science, statistics, and finance.

Taylor series: The Taylor series is an infinite sum of terms expressed in terms of a function's derivatives at a point, named after mathematicians Brook Taylor and Colin Maclaurin. It is commonly used to approximate a function near a specific point.

Mathematical analysis: Mathematical analysis refers to the study of continuous functions and their properties. It encompasses concepts like limits, differentiation, integration, measure, infinite sequences, series, and analytic functions.

Approximation theory: Approximation theory is a mathematical field that studies how functions can be approximated by simpler functions. It aims to quantitatively describe the errors that arise from these approximations. The definition of "best" and "simpler" varies depending on the specific application.

Numerical analysis: Numerical analysis is the study of algorithms that approximate solutions to mathematical problems. It has applications across various fields, including engineering, sciences, medicine, business, and the arts. The use of computational power has allowed for more detailed and realistic mathematical models. Examples include solving differential equations in celestial mechanics and using linear algebra in data analysis.

Functional analysis: Functional analysis is a branch of mathematical analysis that focuses on the study of vector spaces with limit-related structures. It explores linear functions on these spaces and their relationships with continuous or unitary operators. Functional analysis is especially valuable in studying differential and integral equations, with its roots in the study of function spaces and transformations like the Fourier transform.

Hilbert space: A Hilbert space is a space where linear algebra and calculus methods can be extended to infinite-dimensional spaces. It is frequently used in mathematics and physics, particularly as function spaces. It is a vector space with an inner product that allows for the definition of a distance function and ensures completeness.

Calculus of variations: The calculus of variations analyzes small changes in functions to find maximum and minimum values. It uses integrals to express functionals and employs the Euler-Lagrange equation to find functions that maximize or minimize these functionals.

Real analysis: Real analysis is a mathematical branch that focuses on the study of real numbers, sequences, and functions. It explores important topics like convergence, limits, continuity, differentiability, and integrability to understand the behavior of these elements.

Complex analysis: Complex analysis is a branch of mathematics that explores functions of complex numbers. It has wide-ranging applications in various mathematical fields, as well as in physics and engineering.

Cauchy's integral formula: Cauchy's integral formula is a fundamental concept in complex analysis named after Augustin-Louis Cauchy. It states that a holomorphic function on a disk can be determined entirely by its values on the boundary of the disk. This formula also provides integral formulas for all derivatives of the function. It demonstrates the equivalence of differentiation and integration in complex analysis, a property not seen in real analysis.

Euler's formula: Euler's formula relates trigonometric and exponential functions in complex analysis. It states that for any real number x, a fundamental relationship exists between these functions. Named after Leonhard Euler, this mathematical formula establishes the connection between complex exponential and trigonometric functions.

Euler's identity: Euler's identity is a fundamental equality in mathematics expressed as a concise formula. It connects five important numbers: 0, 1, pi, e (Euler's number), and the imaginary unit i. This identity holds great significance for its elegant combination of these key constants.

Holomorphic function: A holomorphic function is a complex-valued function that is complex differentiable in a neighborhood of each point in a domain in complex coordinate space. It is infinitely differentiable, locally equal to its Taylor series, and is the main focus of study in complex analysis.

Riemann surface: A Riemann surface is a complex manifold used in mathematics, specifically in complex analysis. It is one-dimensional and serves as a fundamental concept in this field.

Harmonic analysis: Harmonic analysis studies the relationship between a function and its representation in frequency using the Fourier transform for functions on the real line or Fourier series for periodic functions. It is a broad field with applications in number theory, representation theory, signal processing, quantum mechanics, tidal analysis, and neuroscience.

Fourier analysis: Fourier analysis is a mathematical study of representing functions using simpler trigonometric functions. It originated from Fourier series and simplifies the analysis of heat transfer by expressing functions as sums of trigonometric functions.

Fourier series: The Fourier series is an expansion of a periodic function into a sum of trigonometric functions. It is useful for analyzing functions as it simplifies problems by expressing them in terms of sines and cosines. The series was first used to find solutions to the heat equation. While Fourier series cannot approximate all functions and may not always converge, they do converge for well-behaved functions. The coefficients of the series are determined by integrals of the function multiplied by trigonometric functions.

Fourier transform: The Fourier transform is a mathematical operation that converts a function into a complex-valued function of frequency. It describes the frequencies present in the original function and is used in physics, engineering, and mathematics. It can be seen as decomposing a sound into its constituent pitches.

Laplace transform: The Laplace transform is a mathematical tool invented by Pierre-Simon Laplace that converts real variable functions into complex variable functions. It is widely used in science and engineering to solve linear differential equations by transforming them into algebraic equations and convolution into multiplication.

Number theory: Number theory is a branch of pure mathematics that focuses on the study of integers and arithmetic functions. It encompasses prime numbers and the properties of mathematical objects built from integers or their generalizations. German mathematician Carl Friedrich Gauss regarded number theory as the epitome of mathematics.

Prime number: A prime number is a natural number greater than 1 that cannot be divided evenly by any other natural number except 1 and itself. This property makes primes important in number theory. All non-prime numbers are called composite numbers. The fundamental theorem of arithmetic states that every natural number greater than 1 can be written as a unique product of prime numbers.

Euclid's theorem: Euclid's theorem states that there are infinitely many prime numbers. First proven by Euclid in his work Elements, it remains a fundamental statement in number theory. Multiple proofs of the theorem exist.

Prime number theorem: The Prime Number Theorem (PNT) is a mathematical theorem that explains how prime numbers are distributed among positive integers. It shows that as the numbers get larger, prime numbers become less frequent. This theorem was independently proved by Jacques Hadamard and Charles Jean de la Vallée Poussin in 1896, using ideas from Bernhard Riemann.

Fundamental theorem of arithmetic: The Fundamental Theorem of Arithmetic states that every integer greater than 1 can be expressed as a unique product of prime numbers.

Fibonacci sequence: The Fibonacci sequence is a mathematical sequence where each number is the sum of the two preceding ones. It commonly starts with 0 and 1. The sequence is denoted as Fn and begins 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ....

Diophantine equation: A Diophantine equation is a polynomial equation with integer coefficients that only requires integer solutions. It can be linear, where degree one monomials are summed to a constant, or exponential, where unknowns can appear in exponents.

Fermat's Last Theorem: Fermat's Last Theorem is a statement in number theory that states there are no positive integer solutions to the equation an + bn = cn when n is greater than 2. It is known since ancient times that the equation has infinitely many solutions for n = 1 and n = 2.

Algebraic number theory: Algebraic number theory is a branch of number theory that uses abstract algebra techniques to study integers, rational numbers, and their extensions. It focuses on properties of algebraic objects like algebraic number fields, rings of integers, finite fields, and function fields. It helps answer important questions in number theory, such as the existence of solutions to Diophantine equations, unique factorization of rings, and the behavior of ideals and Galois groups.

Algebraic number field: An algebraic number field is a field extension of the rational numbers with finite degree. It is a field that includes the rational numbers and has finite dimension as a vector space over the rationals.

Class field theory: Class field theory is a core branch of algebraic number theory that aims to explain abelian Galois extensions of local and global fields. It utilizes elements linked to the original field.

Analytic number theory: Analytic number theory is a branch of mathematics that uses mathematical analysis to solve problems related to integers. It originated with Dirichlet L-functions, which were introduced by Dirichlet in 1837 to prove his theorem on arithmetic progressions. This field is renowned for its contributions to prime numbers and additive number theory.

Riemann hypothesis: The Riemann hypothesis is a major unsolved problem in math. It proposes that the Riemann zeta function's zeros are limited to negative even integers and complex numbers with a real part of 1/2. It has significant implications for prime number distribution and was introduced by Bernhard Riemann in 1859.

Applied mathematics: Applied mathematics is the use of mathematical methods in various fields like physics, engineering, medicine, biology, finance, business, computer science, and industry. It involves combining mathematical science with specialized knowledge to address practical problems through the formulation and study of mathematical models.

Control theory: Control theory is a field that combines control engineering and mathematics to manage dynamical systems in machines and processes. Its goal is to create models or algorithms to guide inputs, achieving desired states while minimizing delays, overshoot, and errors. It emphasizes stability and strives for optimal control.

Game theory: Game theory is the study of strategic interactions among rational agents, using mathematical models. It has diverse applications in social science, economics, logic, systems science, and computer science. Originally focused on two-person zero-sum games, game theory now encompasses a broader range of behavioral relations, exploring logical decision-making in humans, animals, and computers.

Information theory: Information theory is the study of quantifying, storing, and communicating information. It was established by Nyquist, Hartley, and Shannon in the 1920s and 1940s. This field sits at the intersection of various disciplines like probability theory, statistics, computer science, statistical mechanics, information engineering, and electrical engineering.

Coding theory: Coding theory is the study of codes and their applications in data compression, cryptography, error detection and correction, data transmission, and storage. It involves various disciplines like information theory, electrical engineering, mathematics, linguistics, and computer science to design efficient and reliable data transmission methods by removing redundancy and detecting/correcting errors in transmitted data.

Data compression: Data compression is the method of encoding information with fewer bits than the original representation. It can be lossless, where no information is lost, or lossy, where unnecessary information is removed. Compression reduces bits by eliminating statistical redundancy. A compressor is an encoder, and a decompressor is a decoder.

Error detection and correction: Error detection and correction (EDAC) refers to techniques used in computer science and telecommunication to ensure the accurate transmission of digital data. By detecting and correcting errors caused by channel noise during transmission, EDAC enables reliable delivery of information. This approach allows for the identification of errors and, in most cases, the reconstruction of the original data.

Mathematical optimization: Mathematical optimization involves finding the best option from a group of choices based on a specific criteria. It includes discrete and continuous optimization. This field is relevant in various disciplines such as computer science, engineering, operations research, and economics, and has been studied for centuries in mathematics.

Linear programming: Linear programming (LP) or linear optimization is a mathematical approach used to optimize outcomes in models with linear relationships between requirements and objectives. It is a subset of mathematical programming.

Nonlinear programming: Nonlinear programming is a branch of mathematical optimization that deals with solving optimization problems where constraints or the objective function are nonlinear. It involves determining the extrema of an objective function over a set of unknown variables while satisfying a system of equalities and inequalities. Unlike linear programming, it focuses on addressing problems that are not linear.

Operations research: Operations research (OR) is a field that uses analytical methods to enhance decision-making. It is also referred to as management science.

Theoretical computer science: Theoretical computer science (TCS) is a branch of computer science and mathematics emphasizing mathematical aspects of computing. It encompasses subjects like computation theory, formal language theory, lambda calculus, and type theory.

Abstract machine: An abstract machine is a theoretical model used in computer science to analyze how a computer system works. It functions like a mathematical function, taking inputs and producing outputs based on predefined rules. Unlike physical machines, abstract machines are expected to perform correctly regardless of hardware. They enable step-by-step execution of programs by defining inputs, outputs, and allowable operations. Abstract machines are used for theoretical purposes and as models for real-world computers. In the theory of computation, they play a fundamental role in analyzing algorithm complexity and studying computability. Some examples of abstract machines include finite state machines, Mealy machines, push-down automata, and Turing machines.

Theory of computation: Theory of computation is a field in computer science and mathematics that explores the solvability and efficiency of problems using algorithms on different models of computation. It consists of three main branches: automata theory and formal languages, computability theory, and computational complexity theory. The key question it addresses is the fundamental capabilities and limitations of computers.

Algorithm: An algorithm is a set of instructions used in mathematic and computer science to solve specific problems or perform computations. They are used to specify calculations and data processing, and can include conditionals to automate decision making. The term "algorithm" draws on metaphors from human characteristics, as Turing did when using terms like "memory", "search", and "stimulus".

Formal language: A formal language, used in logic, mathematics, computer science, and linguistics, is made up of words that adhere to specific rules defined by a formal grammar. The language is constructed from an alphabet and is characterized by its well-formedness.

Computational complexity theory: Computational complexity theory classifies computational problems based on their resource usage and their relationships to each other. It is concerned with solving tasks by applying algorithms, which involve mechanical application of mathematical steps.

P versus NP problem: The P versus NP problem is an important unsolved problem in theoretical computer science. It questions whether problems that can be easily checked can also be efficiently solved.

Data structure: A data structure is a computer science concept that refers to the organization, storage, and management format chosen for efficient data access. It encompasses a collection of data values, their relationships, and the operations that can be performed on the data. Essentially, it is an algebraic structure concerning data.