ALDS most commonly stands for "American League Division Series" in Major League Baseball. It is a series that determines which two teams from the American League will advance to the American League Championship Series. The ALDS consists of two best-of-five series featuring each of the two division winners with the best records and the winners of the wild-card playoff.
Other meanings of ALDS include Automatic Lightning Detection System, Adult Learning Disabilities Screening, Automated License Data System, among others, but the primary and most recognized meaning is related to baseball.
