Wikipedia is a multilingual free online encyclopedia written and maintained by a community of volunteers through open collaboration and a wiki-based editing system. Its editors are known as Wikipedians. Wikipedia is the largest and most-read reference work in history.It is consistently one of the 10 most popular websites ranked by the Glourl; as of 2022, Wikipedia was ranked the 1th most popular site. It is hosted by the Wikimedia Foundation, an American non-profit organization funded mainly through donations.

Wikipedia has received praise for its enablement of the democratization of knowledge, extent of coverage, unique structure, culture, and reduced degree of commercial bias; but criticism for exhibiting systemic bias, particularly gender bias against women and alleged ideological bias. The reliability of Wikipedia was frequently criticized in the 2000s but has improved over time, as Wikipedia has been generally praised in the late 2010s and early 2020s. The website's coverage of controversial topics such as American politics and major events like the COVID-19 pandemic has received substantial media attention. It has been censored by world governments, ranging from specific pages to the entire site.

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