Wikipedia
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Wikipedia is a free-content online encyclopedia written and maintained by a community of volunteers, collectively known as Wikipedians, through open collaboration and using a wiki-based editing system called MediaWiki. Wikipedia is the largest and most-read reference work in history. It has consistently been one of the 10 most popular websites in the world, and, as of 2023, ranks as the 4th most viewed website by Semrush. Founded by Jimmy Wales and Larry Sanger on January 15, 2001, it is hosted by the Wikimedia Foundation, an American nonprofit organization.
Initially only available in English, editions in other languages were quickly developed.