Triple A (baseball)

Triple-A (or Class AAA) is the highest level of play in Minor League Baseball in the United States and Mexico. Before 2008, Triple-A leagues also fielded teams in Canada. A total of 30 teams play in the Triple-A International League (IL) and Pacific Coast League (PCL), with 14 teams in the IL and 16 in the PCL. The MLB-independent Mexican League fields 16 teams. Triple-A teams are typically located in large metropolitan areas that do not have Major League Baseball teams, such as Austin, Texas; Indianapolis, Indiana; Columbus, Ohio; and Charlotte, North Carolina.

Interleague play between the International League and Pacific Coast League occurs twice each season. In July, each league's All-Star team competes in the Triple-A All-Star Game. In September each league's regular season champions play each other in the Triple-A National Championship Game to determine an overall champion of Triple-A baseball.

The Triple-A classification was created before the 1946 season. Prior to then, the top level of the minors had been designated as Double-A since 1912. The modern Double-A classification also dates to 1946, when the former Class A1 level was renamed.

Triple-A teams' main purpose is to prepare players for the Major Leagues. ESPN wrote in 2010:

Winning is nice, but secondary. It's much more important for a young prospect like outfielder Xavier Paul to get regular at-bats against lefties, or work on dropping down sacrifice bunts with a runner on first, than it is to take three of four from the Portland Beavers.

...
Wikipedia