Wikipedia is a free, web-based encyclopedia that allows users to collaboratively create, edit, and update articles on a vast range of topics. It is hosted by the Wikimedia Foundation and operates under a model of open editing, meaning that anyone with internet access can contribute content. The platform is multilingual and relies on volunteer editors to ensure the accuracy and reliability of its entries, although it does have guidelines and policies to maintain quality. Wikipedia is one of the most visited websites globally and serves as a valuable resource for information.