Wikipedia is a free-access, free-content Internet encyclopedia, supported and hosted by the non-profit Wikimedia Foundation. Those who can access the site can edit most of its articles, with the expectation that they follow the website's policies. Wikipedia is ranked among the ten most popular websites and constitutes the Internet's largest and most popular general reference work.

Wikipedia

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Wikipedia is a free online encyclopedia that aims to allow anyone to edit any article and create them. Wikipedia is the largest and most popular general reference work on the Internet and is ranked among the ten most popular websites. Wikipedia is owned by the nonprofit Wikimedia Foundation.

Source: Wikipedia