Roulette is a casino game played on a spinning wheel. It is one of the most popular games in casinos worldwide and has offered glamour, mystery and excitement to players since the 17th century.

The game consists of a table and a wheel, and the croupier spins a ball around the wheel. The wheel is a solid wooden disk with metal partitions known as separators, or frets, and slots between the partitions. The wheels of European-style and American-style roulette have thirty-six compartments, each painted red or black. The compartments are numbered nonconsecutively from 1 to 36, with a special 37th pocket marked 0 on European-style wheels and two green compartments on American-style wheels.

There are two kinds of bets on a roulette table: inside bets and outside bets. Inside bets are bets on single numbers, groups of numbers, or combinations of these. The payoffs for these bets are determined by the odds of winning and the amount you wager.

When betting on a single number, players place a chip on the spot where the number lies on the roulette board, or on an entire street of numbers. For example, if you bet on number 2, the chip is placed on the intersection of three streets on the table map.

Inside bets on a particular group of numbers cost a certain number of chips to complete. For instance, a bet on zero costs 17 chips to complete, while a bet on numbers 1 and 3 require 27 and 36 chips to complete, respectively.

There are also announced bets, which are special bets that have specific rules. These are commonly featured in French Roulette, but they are also found in online European Roulette variants.