Modern slot machines are electronic although they may take the appearance of mechanical devices (machines rolls). There are several types of electronic slot machines: machines roller videos, machine roller classics, poker, multigame.

In all cases, the operation is identical. A slot machine has a cycle combinations. This cycle lists as a list all possible combinations that the machine can get out. The player inserts money into the machine (coins, tickets, electronic money) and can run the game using buttons of a lever (slot games) or a touch screen. When he launched the game, a combination of the cycle is randomly selected and displayed. The player wins a prize or not, and can play again. The combination chosen randomly in the cycle at that time does come out more during this cycle. This is the same for all combinations. The cycle is completed when all combinations have emerged. A new cycle can begin again. The size or duration of the cycle is measured in strokes. Today, with video machines to 5 or 6 rolls and many symbols, cycles may have durations of over 16 million hits. It is also common for a machine to be replaced before the end of its cycle.