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Learn about the Normandy Invasion, a turning point in World War II, with articles, videos, quizzes, and more from Encyclopedia Britannica. Explore the history, science, culture, and biographies of this comprehensive portal.
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The Olympic Games began in Olympia, Greece, in 776 BCE and...
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Sergeant Stubby was a stray dog whose heroic service during...
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Encyclopaedia, reference work that contains information on all branches of knowledge or that treats a particular branch of knowledge in a comprehensive manner. For more than 2,000 years encyclopaedias have existed as summaries of extant scholarship in forms comprehensible to their readers.
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Generally speaking, encyclopedia articles focus on factual information concerning the subject named in the article's title; this is unlike dictionary entries, which focus on linguistic information about words, such as their etymology, meaning, pronunciation, use, and grammatical forms.
Encyclopaedia Britannica is the oldest English-language general encyclopedia. The Encyclopaedia Britannica was first published in 1768, when it began to appear in Edinburgh, and its first digital version debuted in 1981. In 1994 Britannica released the first Internet-based encyclopedia, and Britannica.com was launched in 1999.
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Welcome to Oxford Research Encyclopedias. Current, peer-reviewed trustworthy research, read in 30 minutes or less across 25 encyclopedias. Includes the Encyclopedia of Social Work and the Oxford Classical Dictionary. Learn more. News. Featured. Citizen Science and Crowd Science.