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An encyclopedia is a "reference work", sort of like an extremely advanced dictionary. In general, an encyclopedia contains broad areas of knowledge. However, some modified versions may contain information on specific areas of knowledge. Traditionally, encyclopedias are labelled alphabetically, including a volume number and an edition. A complete set would be comprised of 26 books labeled from A-Z (English alphabet). In each encyclopedia, only words beginning with the letter indicated on the cover of the book will be found inside. For example: in encyclopedia A words such as article, animal, and answer can be found with a definition, the history of the word, how its meaning has changed over time, among other interesting facts that could not be found in a dictionary.
