Wikipedia is a free, web-based, multilingual encyclopedia created through collaborative editing. It was founded in 2001 by Jimmy Wales and Larry Sanger and has grown rapidly, with over 15 million articles across hundreds of language editions. While open to public editing, several studies have found Wikipedia's accuracy compares favorably to traditional encyclopedias, with some professors including it in their course materials. Wikipedia has become a widely used reference source in academia, journalism, and politics due to its cultural influence and accessibility of information.