Big Brother is a reality TV franchise where contestants, known as houseguests or housemates, live together in a specially built house under constant surveillance and compete to avoid eviction until one winner remains. The concept originates from the Netherlands and draws its name from George Orwell’s novel Nineteen Eighty-Four, referencing the ever-present gaze of Big Brother. Each episode or day, contestants nominate others for eviction, and viewers (or sometimes the housemates themselves) vote to evict or save. The format typically includes confidential nominations, weekly or periodic evictions, challenges, and a final vote to determine the winner, who usually receives a cash prize. The franchise has many international versions and has adapted various voting mechanisms and task structures across regions and seasons.