The World Tag Team Championship is a men's professional wrestling world tag team championship contested in WWE on the Raw brand. Introduced as the WWE Tag Team Championship, it was WWE's third world tag team title, and sixth tag team title overall. After WWE bought the promotions of Extreme Championship Wrestling (ECW) and World Championship Wrestling (WCW), and unified the WCW Tag Team Championship into its own title at Survivor Series 2001, it split its roster into two brands, Raw and SmackDown. As WWE's original World Tag Team Championship was designated exclusive to the Raw brand, SmackDown introduced the WWE Tag Team Championship as its own championship.