Wikipedia is a constantly updated, community-organized online encyclopedia. It allows random people and dedicated editors to edit any page, though administrators can block users and correct incorrectly edited pages. With over 24 million articles in 285 languages, it has become the largest general reference work on the internet with an estimated 365 million readers worldwide. While open to human error and vandalism, studies show anonymous contributions are as reliable as registered users, and Wikipedia aims to empower people to share educational content globally.