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Wikipedia is a multilingual, web-based, free content encyclopedia project. Wikipedia is written collaboratively by volunteers; its articles can be edited by anyone with access to the encylopedia. Wikipedia's name is a portmanteau of the words wiki (a type of collaborative website) and encyclopedia. Its primary servers are in Tampa, Florida, with additional servers in Amsterdam and Seoul.

Wikipedia's English edition was lunched on 15 January 2001 as a complement to Nupedia, an expert-written and now defunct encyclopedia. The project is currently operated by the Wikimedia Foundation, a non-profit organization created by Jimmy Wales, the co-founder of Wikipedia. Wikipedia has approximately seven million articles in 251 languages, 1.7 million of which are in the English edition. It had steadily risen in popularity since its inception, and currently ranks among the top twenty most-visited websites worldwide.

Due to its open nature, critics have questioned Wikipedia's reliability and accuracy. The site had also been criticized for its susceptibility to vandalism, uneven quality, systemic bias and inconsistencies, and for favoring consensus over credentials in its editorial process. Wikipedia's content policies and sub-projects set up by contributors seek to address these concerns. Two scholarly studies have concluded that vandalism is generally short-lived and that Wikipedia is roughly as accurate as other encyclopedias.