Reality television is a genre of television programming that documents purportedly unscripted real-life situations, often starring unknown individuals rather than professional actors. Reality television came to prominence in the late 1990s and the early 2000s with the global successes of the series Survivor, Idols, and Big Brother, all of which became global franchises. Reality television shows tend to be interspersed with "confessionals", short interview segments in which cast members reflect on or provide context for the events being depicted on-screen. Competition-based reality shows typically feature gradual elimination of participants, either by a panel of judges or by the viewership of the show.