Roullete is a casino game where the players place bets on numbers, sections or colors of the Roulette wheel before the croupier throws the ball into it. The bets are then paid out according to the betting odds. The roulette game evolved from the earlier games hoca and portique, with the current layout and wheel structure coming about in the late 1790s. It quickly became a popular game in the casinos and gambling dens of Europe, and subsequently spread to the Americas.
The Roulette wheel consists of a solid wooden disk slightly convex in shape, with a metal compartments called separators or frets around its edge. Thirty-six of these compartments, painted alternately red and black, are numbered nonconsecutively from 1 to 36; on European roulette wheels a 37th compartment is green and carries the number 0. A spindle holds the wheel upright and rotates at almost frictionless speed.
There are many betting options in roulette, with players able to choose from single numbers, various groupings of numbers, the color red or black, or whether they are high (19-36) or low (1-18). The game also has special bets such as first, second and third dozen and high/low. The house edge ranges between 2.63 and 7.89 percent depending on the betting strategy and the type of wheel used.