MLB stands for Major League Baseball, which is the professional baseball organization in North America. It is composed of two leagues: the American League (AL) and the National League (NL). Founded in 1869, MLB is one of the oldest major professional sports leagues in the United States and Canada. The league consists of 30 teams, divided into two leagues with three divisions each. MLB is responsible for governing professional baseball in the U.S. and Canada, including organizing the season schedule, overseeing player contracts, and managing the playoffs culminating in the World Series, where the champions of the AL and NL compete for the championship title. MLB has a significant cultural impact and is often referred to as “America’s pastime.”