Wikipedia is a free online encyclopedia that allows users to create and edit articles on a wide range of topics. It is collaboratively written and maintained by volunteers from around the world, making it one of the largest and most comprehensive reference works available today. Launched in 2001, Wikipedia has grown to include millions of articles in multiple languages. It operates under a model of open editing, meaning anyone can contribute, which fosters a diverse range of perspectives and information. The platform is governed by a set of guidelines to ensure the reliability and neutrality of its content.