The World Tag Team Championship was the original professional wrestling world tag team championship in the World Wrestling Entertainment (WWE) promotion, and the promotion's third tag team championship overall. Originally established by the then-World Wide Wrestling Federation (WWWF) on June 3, 1971 (renamed World Wrestling Federation in 1979), it served as the only title for tag teams in the promotion until the then-World Wrestling Federation (WWF) bought World Championship Wrestling (WCW) in March 2001, which added their tag team championship. Both titles were unified in November 2001, retiring WCW's championship and continuing WWF's.