American roulette features an additional 00 pocket on the wheel, whereas European and French roulette only have a single 0 pocket. This difference affects the odds of winning and the house edge.
In French roulette, players are offered the “La Partage” rule, which returns half of their even-money bets if the ball lands on zero. This rule is not available in American or European roulette.
Lastly, the arrangement of numbers on the wheel and the betting layout differs slightly between the three variations of roulette.