There are 14 Minor League Baseball (MiLB) leagues and 202 teams in operation across the United States, Dominican Republic, and Canada, which are affiliated with Major League Baseball (MLB) teams. They are organized by one of five classes : Triple-A, Double-A, High-A, Single-A, and Rookie. Of these, 120 teams in 11 leagues are each affiliated with one MLB team through a standardized professional development license. Additionally, three leagues consisting of a total of 82 Rookie teams are located at MLB spring training complexes in Arizona and Florida, as well as in the Dominican Republic. These affiliated leagues contest their seasons during the MLB season. The Arizona Fall League, consisting of six teams, operates in the autumn after the conclusion of the MiLB and MLB seasons to develop top prospects at various classifications.