Boxing is a combat sport in which two people, usually wearing protective gloves, throw punches at each other for a predetermined amount of time in a boxing ring. Amateur boxing is both an Olympic and Commonwealth Games sport and is a common fixture in most international games—it also has its own World Championships. Boxing is overseen by a referee over a series of one- to three-minute intervals called rounds. In Professional Boxing professional bouts are usually much longer than amateur bouts, typically ranging from ten to twelve rounds, though four round fights are common for less experienced fighters or club fighters. There are also some two. and three-round professional bouts, especially in Australia.