Major League Baseball (MLB) is the highest level of play in American professional baseball. Specifically, Major League Baseball refers to the organization that operates the National League and the American League, by means of a joint organizational structure that has developed gradually between them since 1903 (the National League having been in existence since 1876).

MLB is controlled by the Major League Baseball Constitution that has undergone several incarnations since 1876 with the most recent revisions being made in 2005. Major League Baseball is divided into two leagues, the American League, with fourteen teams, and the National League, with sixteen teams. Each league is further subdivided into three divisions, labeled East, Central, and West.

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