A casino game named after a French diminutive for little wheel. In the game, players may choose to place bets on either a single number or a range of numbers, the colours red or black, or whether the number is odd or even.

To determine the winning number and color, a croupier spins a wheel in one direction, then spins a ball in the opposite direction around a tilted circular track running around the circumference of the wheel. The ball eventually loses momentum and falls on to the wheel and into one of 37 (in French/European roulette) or 38 (in American roulette) coloured and numbered pockets on the wheel.