Roullete, sometimes known as Roulette, is a game in which the player places a wager on the outcome of a spinning wheel. Bets can be placed on a single number, various groupings of numbers, colors (red and black), odds (even and odd) and whether the spin will result in a high or low number (19-36). The excitement generated by watching a ball land in a numbered pocket makes roulette a popular game for many gamblers.

The roulette wheel consists of a solid wooden disk slightly convex in shape. Around the perimeter of the disk are metal partitions, called frets or separators, which are painted alternately red and black. Thirty-six of these compartments are numbered non-consecutively from 1 to 36; on European-style wheels a green compartment carries the sign 0; and on American roulette wheels two green pockets carry the signs 00. A croupier, or dealer, spins the wheel in a smooth manner while players make their bets.

The simplest bet is a straight-up, which is placed in one of the 37 compartments labeled 1 through 36 on the roulette table. A winning bet pays a multiple of the amount wagered, depending on the number and location of the chips. A number such as zero costs 17 chips to complete and pays 235 chips; the number 1 or 3 cost 27 chips to complete and pay 297 chips. The payouts on these bets can be considerable, but they are not a guaranteed way to win. Roulette has a built-in house edge, and except in rare circumstances no betting system can overcome it.