Roulette is a gambling game in which players bet on which numbered compartment of a revolving wheel a small ball will come to rest in. There are thirty-six red and black numbered compartments, plus one green (on European-style wheels) or two green (on American wheels) compartments marked 0.
In the game of roulette, players make wagers on inside and outside bets. Inside bets are individual digits; outside bets cover large groups of numbers.