Encyclopedia

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An encyclopedia or encyclopaedia (also spelled encyclopædia, see spelling
differences) is a type of reference work or compendium holding a
comprehensive summary of information from either all branches of knowledge or a
particular branch of knowledge. Encyclopedias are divided into articles or
entries, which are usually accessed alphabetically by article name.
Encyclopedia entries are longer and more detailed than those in most
dictionaries. Generally speaking, unlike dictionary entries, which focus on
linguistic information about words, encyclopedia articles focus on factual
information to cover the thing or concept for which the article name stands.