American Idol is a reality singing competition television series that began airing in 2002 on Fox. It is based on the British show Pop Idol and employs a panel of judges who critique contestants' performances. Contestants are selected through a multi-stage process involving auditions in front of producers and judges. Successful contestants advance through Hollywood week, the semi-finals, and finals, with viewers voting to eliminate contestants. The show is hosted by Ryan Seacrest and has featured various judges over the seasons including Simon Cowell, Paula Abdul, Randy Jackson, Jennifer Lopez, and Keith Urban.