Major League Baseball (MLB) is the professional baseball organization in the United States and Canada, consisting of two leagues: the American League and the National League. Founded in 1869, it is one of the oldest professional sports leagues in North America. MLB features 30 teams that compete in a regular season, followed by playoffs to determine the league champions. The MLB season typically runs from April to October, culminating in the World Series, where the champions of the two leagues face off. Players in MLB are some of the best in the world, and the league has a rich history, including legendary figures like Babe Ruth and Jackie Robinson.