The European as well as the French roulette rules is very alike. The French Roulette wheel has only 37 slots with a single zero and the outside layout differ from European roulette table.
The odds in American roulette are not as good as the French and European Roulette. The gambler will only loose half of his even money bet when the ball lands on a zero this refer to the rule La Partage.
The goal of the roulette is to guess the correct number slot where the ball is going to fall on.