A typical game of roulette includes a wheel, a ball and a table. Roulette wheels feature numbers from 0 to 36. Roulette tables have betting areas representing all the numbers on the wheel. Players place chips on these betting areas, and the croupier (optional, which is a casino worker) spins the wheel and throws a ball into it. When the ball stops, the number it stops on is the winning number.
The mobile version of roulette works in the same way, except for the fact that the game is accessed online and played on a smartphone or tablet. This eliminates the need to find a physical casino where you can play the game. To start playing, you just need to launch the app or game, place your bets and spin the wheel.