Roulette is a casino game, named after the French word (little wheel). In the game, players can choose to group individual numbers, various numbers, red or black, odd or even numbers, or high (19-36) or low (1-18).

To determine the winning number and color, the host rotates a wheel in one direction, then rotates a ball in the opposite direction around an inclined circular track around the outer edge of the wheel. The ball eventually loses power, passes through a deflector area and lands on the wheel, falling into one of the 37 (French / European) or 38 (American) color and number pockets on the wheel.

The betting area covered with cloth on the roulette table is called the layout. The layout can be single zero or double zero. European style layouts have a single zero, while American style layouts usually have a double zero. Nowadays, most casinos use American roulette tables with wheels at one end. In the outskirts of Monte Carlo, there is rarely a French style table with a wheel in the middle and a layout on both sides.