The Wikimedia Foundation is the non-profit organization that supports Wikipedia and other projects. Wikipedia is the world's largest and most popular free knowledge resource. It is online, free to use for any purpose, and free of advertising. Wikipedia contains more than 34 million volunteer-authored articles in over 288 languages, and is visited by nearly 500 million people every month, making it one of the most popular sites in the world. The Wikimedia Foundation trademark is used with the permission of the Wikimedia Foundation, which does not represent an endorsement. The trademark is licensed under CC BY-SA 3.0 (Author User:Neolux via Wikimedia Commons).