Basketball is a team sport played on a court with two hoops at each end. The objective is to score more points than the opposing team by shooting a ball through a hoop. A regulation hoop has an 18-inch diameter rim mounted 10 feet high on a backboard. Teams score points by shooting the ball through the hoop from inside or outside the three-point line. Additional rules govern traveling, double dribbling, and fouls, which result in free throws for the opposing team. Basketball has evolved specialized player positions and techniques for shooting, passing, dribbling, and rebounding.