Ozzfest is an annual music festival founded by heavy metal musician Ozzy Osbourne in 1996. It features a lineup of various rock and metal bands, showcasing both established artists and emerging talent. The festival typically takes place during the summer months and has been held in multiple locations across the United States. The event is known for its energetic atmosphere and diverse range of performances, often including Black Sabbath, System of a Down, and Slipknot. Ozzfest has played a significant role in popularizing heavy metal music and has become a cultural phenomenon within the rock community.