The series premiered on July 20, 2005, with over ten million viewers. The first season was hosted by American news personality Lauren Sánchez. Since the second season, it has been hosted by English former children's television personality and game show host Cat Deeley. The show features a format where dancers trained in a variety of dance genres enter open auditions held in several major U.S. cities to showcase their talents and move forward through successive additional rounds of auditions to test their ability to adapt to different styles. At the end of this process, a small number of contestants are chosen. These contestants move on to the competition's main phase, where they perform solo, duet, and group dance numbers on live television.