The roulette wheel is a perpetual motion machine. The unpredictability of the spinning device is associated with odds and variations. Making the correct guess was both entertaining and almost impossible at the same time. This made the game a perfect addition to the gambling industry.
Playing roulette itself is like lotto, since you bet on a number or a series of numbers, that are spinning around. The difference is that the game is not about drawing numbers, but targeting a position. You can rely on strategy or pure luck to place a bet. The graphic below will give more detail about the topic.