Big Brother is the British version of the international reality television franchise Big Brother created by producer John de Mol in 1997. Broadcast yearly from 18 July 2000 to 5 November 2018, and returned on 8 October 2023, the show follows the format of other national editions, in which a group of contestants, known as "housemates", live together in a specially constructed house that is isolated from the outside world. They are continuously monitored by live television cameras and personal audio microphones. Throughout the competition, housemates are "evicted" from the house by public televoting. The last remaining housemate wins the competition and a cash prize. The series takes its name from the oppressive character known by that name in George Orwell's 1949 novel Nineteen Eighty-Four.

Big Brother is a reality competition television franchise created by John de Mol Jr., first broadcast in the Netherlands in 1999 and subsequently syndicated internationally. The show features contestants called "housemates" or "HouseGuests" who live together in a specially constructed house that is isolated from the outside world. The name is inspired by Big Brother from George Orwell's novel Nineteen Eighty-Four, and the housemates are continuously monitored during their stay in the house by live television cameras as well as personal audio microphones. Throughout the course of the competition, they are voted out until only one remains and wins the cash prize.