Wikipedia ( ( listen), ( listen) WIK-ih-PEE-dee-ə) is a multilingual, web-based, free-content encyclopedia that is based on a model of openly editable content. It is the largest and most-popular general reference work on the Internet, and is named as one of the most popular websites. It is owned and supported by the Wikimedia Foundation, a non-profit organization which operates on whatever money it receives from its annual fund drives.
Wikipedia was launched on January 15, 2001 by Jimmy Wales and Larry Sanger. Sanger coined its name, a portmanteau of wiki and encyclopedia. There was only the English- language version initially, but similar versions in other languages quickly developed which differ in content and in editing practices. With 5,647,524 articles, the English Wikipedia is the largest of the more than 290 Wikipedia encyclopedias. Overall, Wikipedia comprises more than 40 million articles in 301 different languages and had 18 billion page views and nearly 500 million unique visitors each month as of February 2014.
As of March 2017, Wikipedia has about 40,000 Featured Articles and Good Articles that cover vital topics. In 2005, Nature published a peer review comparing 42 science articles from Encyclopædia Britannica and Wikipedia and found that Wikipedia's level of accuracy approached that of Encyclopædia Britannica.
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