A violation occurs when the player breaks one of the rules of Basketball. A violation results in the awarding of the ball to the opponents.
It can also result from the player taking more than 2 steps without bouncing the ball on the floor. This is called Traveling.
Another example of violation occurs when a player stops dribbling and then starts dribbling again or when he bounces the ball with both hands on the ball. We call this a double Dribble.
A violation is also committed if you twist your hand, when in contact with the ball, beyond the vertical, bringing it under the ball. This is called Carry, as the hand must always remain on the top of the ball.