The roulette wheel features numbers (1-35) in red and black colours, and either one or two zero pockets. European and French roulette contains just one zero pocket (0), whilst American roulette contains two (0) and (00). If the ball lands in any zero pocket, you lose your bet. That is, unless you are playing with French roulette rules, in which case half of your bet may be saved, or carried on.
After betting, the roulette wheel is spun, and which pocket the ball lands in determines whether or not your bet has been successful. If it lands in an unfavourable pocket, or any of the zeros, you lose. If it lands in a favourable pocket, then you will win either 1:1 for red, black, odd, even, high or low bets, 2:1 for dozens or columns, 5:1 for six lines, 8:1 for corners, 11:1 for trios and streets, 17:1 for splits, and 35:1 for straight-up bets.