Big Brother is a British reality TV show competition where people are put together in a house, isolated from the outside world and kept under surveillance - which is then screened to viewers at home. Contestants with the fewest public votes are eliminated every week as the show moves towards announcing a winner who gets a cash prize. The show started on Channel 4 in 2000, before moving to Channel 5 for a relaunch in 2011. It's set to return for a new series in 2023, this time on ITV2 and ITVX