In the United States and Canada, the term professional football includes the professional forms of American and Canadian gridiron football. In common usage, it refers to former and existing major football leagues in either country. Currently (2015), there are multiple professional football leagues in North America: the three best known are the National Football League (NFL) and the Arena Football League (AFL) in the U.S. and the Canadian Football League (CFL) in Canada. The NFL has existed continuously since being so named in 1922.