Russian roulette is a game of chance involving a revolver. A single cartridge is loaded into the revolver's cylinder, the cylinder is spun to randomize the position of the cartridge, and the player pulls the trigger while the gun is pointed at their own head. If the chamber aligned with the barrel is empty, nothing happens. If it contains the cartridge, the gun fires. The outcome depends entirely on chance, which is why it is called "Russian roulette." The concept became widely known through books, films, and popular culture.