A spectator sport is a sport that is characterized by the presence of spectators, or watchers, at its matches. For instance, American football, association football, baseball, basketball, professional boxing, Canadian football, cricket, field hockey, Formula One, ice hockey, rugby league, rugby union, soccer, team handball, tennis and volleyball are spectator sports, while hunting or underwater hockey typically are not. Spectator sports may be professional sports or amateur sports. They often are distinguished from participant sports, which are more recreational; golf and tennis can be either. Association football, also known as soccer, is by far the most watched sport on the planet.