The following outline is provided as an overview of and a topical guide to Wikipedia:
Wikipedia[a] is a free online encyclopedia, written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the wiki software MediaWiki. Founded by Jimmy Wales and Larry Sanger on January 15, 2001, Wikipedia has been hosted since 2003 by the Wikimedia Foundation, an American nonprofit organization funded mainly by donations from readers.[1] Wikipedia is the largest and most-read reference work in history.[2][3]
Initially available only in English, Wikipedia now exists in over 340 languages. The English Wikipedia, with over 6 million articles, remains the largest of the editions, which together comprise more than 64 million articles and attract more than 1.5 billion unique device visits and 13 million edits per month (about 5 edits per second on average) as of April 2024[update].[4] As of March 2025[update], over 25% of Wikipedia's traffic comes from the United States, followed by Japan at 6.38%, the United Kingdom at 5.81%, Germany at 4.97%, Russia at 4.86%, and the remaining 52.25% split among other countries.[5]
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