E is for Encyclopedia

An encyclopedia is a reference work that gives information about many subjects, such as science, history, animals, places, and people. Its articles explain facts and important ideas in an organized way. Encyclopedias may be printed as books or published online, and they are usually written or checked by experts.

Older encyclopedias were large sets of books arranged in alphabetical order or by subject. Today, online encyclopedias can be searched quickly and may include pictures, maps, videos, and links to related articles.