What is an encyclopedia?

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Definition:

An encyclopedia is not a book that contains all the knowledge of mankind, but it is a work that contains pieces of information of limited extent covering almost all subjects. They are useful for getting an overview of a topic and placing it in context. It contains information on various topics, places and people. Encyclopedias are revised regularly. It will usually give cross references to related information. It will include illustrations like maps, photographs, diagrams and graphs as well as a reading list at the end for additional information

Types of encyclopedias


i) General encyclopedias

these encyclopedias try to cover all subjects and contain shorter, less detailed descriptions. Easy to understand language and style are used.
Examples:
World Book: Encyclopedia Britannica
www.wikipedia.org:
www.infoplease.com
New world encyclopedia
online encyclopedias
ii) Subject encyclopedias
Example: Encyclopedia of information Science