The Australian Football League (AFL) is the professional Australian national competition in the sport of Australian rules football.
The league comprises 16 teams which play 22 home and away rounds between late March and late August or early September. This is followed by a four-week finals series which culminates in two teams playing off for the Premiership in the Grand Final, the essence of the game.
The organisation which became the AFL was formed in 1897 when eight teams from the Victorian Football Association (VFA, established 1877) broke away to begin the Victorian Football League (VFL). By 1925 the league had expanded to twelve teams (all based in Victoria), with no change until 1982 when the league commenced its expansion to a national competition by relocating South Melbourne to Sydney, New South Wales. Since then five other non-Victorian clubs have been added: two each from Western Australia and South Australia and one from Queensland.
The league was officially renamed the Australian Football League in 1990 to reflect the new national perspective.
The AFL is the most attended sporting league in Australia; it is also the most popular sport competition in terms of TV ratings in the nation. The AFL is currently the fourth-most attended professional sports league in the world in terms of attendance per match, with an average attendance of over 38,000.
List of Current Football Clubs:
North Melbourne Kangaroos
Port Adelaide Power
St Kilda Saints
West Coast Eagles
Source (and learn more): Wikipedia, Official AFL website