Roulette is the best-known symbol of casino. Roulette is so popular due to its luxury,passion and simple rules. If you translate the word of “Roulette” from French you will get “small wheel”. It was Blaise Pascal who introduced the primitive version of this game in the 17th century. Later the single zero Roulette appeared. It was introduced by Francois and Louis Blanc. As gambling was illegal in France in the 19th century, the game was introduced in Hamburg, Germany where it became very popular and replaced an earlier version that featured higher odds. Later the game of Roulette was brought back to France and the Prince of Monaco loved this game a lot. The game of Roulette was brought to the USA at the beginning of the 19th century. Some additional features were deleted and the game got a double zero back. The game of Roulette attracted a lot of American gamblers.

The Martingale is the best-known roulette betting system. It varies greatly. The main idea of the system is that when you win, you pocket your bet. If you lose, you should double your previous bet.By doing this in case you win, you get back your previous loss and one more unit.And so on.
The Martingale System is effective only if you have an infinite bankroll and no betting limits.
Another popular roulette system is the d'Alembert system. This system assumes that after a win, a player is less likely to win again.So after a win, you subtract a chip from your bet. The d'Alembert system also assumes that you are less likely to lose after a losing spin, so in that case, you add a chip to your bet. The fact that the roulette wheel has no memory and each spin is an independent trial with exactly the same odds of a win or loss is the previous spin is a weak point of the system.

The numbers 1 through 36 are divided evenly among red and black "pockets" on the Roulette wheel. The pocket is an area, in which the ball can land. The Roulette wheel also has on or two green pockets. The green pockets has numbers 0 and 00 or only 00, depending on the kind of Roulette.
The Roulette wheel is spun by the dealer in the counter clockwise direction and then he releases a plastic ball along the top of the wheel’s cavity. As the wheel loses velocity the ball is pulled down off of the track and bounces around until it settles into a pocket.