The National Basketball Association (NBA) is a men's professional basketball league in North America, composed of 30 teams. It is one of the four major professional sports leagues in the United States and Canada, and is widely considered to be the premier men's professional basketball league in the world. The NBA was founded in 1946 and is headquartered in New York City. The league's revenue comes from ticket sales, merchandise, sponsorships, and media rights. The NBA has a global following and is broadcast in over 215 countries and territories.