In addition to the National Football League, there are three additional major professional football leagues worldwide: the Arena Football League, Canadian Football League and United Football League. In addition, there are several minor professional leagues, including the Fall Experimental Football League, as well as the American Professional Football League, American Indoor Football League, Indoor Football League, Champions Indoor League, Lone Star Football League and Professional Indoor Football League.
Of the major professional football leagues, only the Arena Football League is played indoors. The majority of the minor professional football leagues are played indoors, with the exception of the Fall Experimental Football League, which began play in 2014. In addition, there are many semi-professional football leagues that exist in the United States and Canada. There are also several women's leagues, including some that are based in Italy.