The
Wikimedia Foundation (
WMF) is an American non-profit and
charitable organization headquartered in
San Francisco,
California, that operates many
wikis. The foundation is mostly known for hosting
Wikipedia, the
Internet encyclopedia, as well as
Wiktionary,
Wikiquote,
Wikibooks,
Wikisource,
Wikimedia Commons,
Wikispecies,
Wikinews,
Wikiversity,
Wikidata,
Wikivoyage, Wikimedia Incubator, and . It also owned the now-defunct
Nupedia.