The nonprofit that hosts Wikipedia and supports free knowledge for every person on the planet.

The Wikimedia Foundation is an American 501(c)(3) nonprofit organization that hosts Wikipedia and fourteen related open collaboration projects. In the metadata domain, Wikimedia is significant as the operator of Wikidata, the free knowledge base that provides structured data to Wikimedia projects and external consumers. Wikidata serves as a central source for identifiers, linked data, and multilingual metadata used by libraries, cultural heritage institutions, and research organizations worldwide. The Foundation supports the development of MediaWiki, the wiki software underpinning all Wikimedia projects.