In basketball, a turnover occurs when a team loses possession of the ball to the opposing team before a player takes a shot at his team's basket. This can result from the ball being stolen, the player making mistakes such as stepping out of bounds, illegal screen, a double dribble, having a pass intercepted, throwing the ball out of bounds, three-second violaton a five-second violation, or committing an error such as traveling, a shot clock violation, palming, a backcourt violation, or committing an offensive foul. A technical foul against a team that is in possession of the ball is a blatant example of a turnover, because the opponent is awarded a free throw in addition to possession of the ball.
Some players are prone to turnovers because of having poor court vision or making mental mistakes. Also, many superstars average more turnovers than anybody on their team as they will often be handling the ball. It is unusual for the best player of a team to have zero turnovers. Also, a point guard may often have the most turnovers because they are usually the player that possesses the ball most for their respective team.