The World Cup is a round robin format consisting of six teams from around the world. Each team plays each other once, then the two teams with the best records play in a one-game, winner-take-all championship. In 2010, the field was reduced to 4 teams, with the two teams with the best records playing in a championship game.
The official world competition was first held in 2005 and has been played every year since, with the exception of 2008 due to many national teams' participation in the Olympics. However, softball has since been discontinued as an Olympic sport, thereby ensuring that the World Cup will remain relevant at the international level for the foreseeable future.