As well as being a form of recreation for the participants, much sport is played in front of an audience. Most professional sport is played in a 'theatre' of some kind; be it a stadium, arena, golf course, race track, or the open road, with provision for the often paying public.
Large television or radio audiences are also commonly attracted, with rival broadcasters bidding large amounts of money for the 'rights' to show certain fixtures. The football World Cup attracts a global television audience of hundreds of millions; the 2006 Final alone attracted an estimated worldwide audience of well over 700 million. The Cricket World Cup is another sporting event which attracts a global audience. The 2007 Cricket World Cup attracted about 2.3 Billion viewers all over the world. In the United States, the championship game of the NFL, the Super Bowl, has become one of the most watched television broadcasts of the year. Super Bowl Sunday is a de facto national holiday in America; the viewership being so great that in 2007 advertising space was reported as being sold at $2.6m for a 30 second slot.
