Roulette rounds are a popular game of chance in which players bet on the outcome of a spinning wheel. The wheel is divided into numbered slots, and players can place bets on a single number, a range of numbers, the color red or black, or whether the number is odd or even. The round is completed when the wheel stops spinning and the ball lands in one of the slots. The term 'spins' is used to refer to the rotation of the wheel during a roulette round.