The Wikimedia Foundation is a non-profit organization that supports and promotes free knowledge through various projects, including Wikipedia, the world's largest online encyclopedia. Founded in 2003, it aims to provide access to information for everyone, regardless of their location or background. The foundation operates several other platforms, such as Wikimedia Commons, which hosts free media files, and Wiktionary, a collaborative dictionary. It relies on donations and volunteers to maintain and improve its projects, ensuring that knowledge remains freely available to all.