The National Basketball Association (NBA) is a professional basketball league in North America. The league is composed of 30 teams (29 in the United States and 1 in Canada) and is one of the four major professional sports leagues in the United States and Canada. It is the premier men's professional basketball league in the world. In North America, the NBA is the third wealthiest professional sport league after the National Football League (NFL) and Major League Baseball (MLB) by revenue, and among the top four in the world.