World of Warcraft is an online role-playing game.
Massively multiplayer online role-playing games ( MMORPGs ) are a combination of role-playing video games and massively multiplayer online games in which a very large number of players interact with one another within a virtual world . World of Warcraft ( WoW ) is a massively multiplayer online role-playing game ( MMORPG ) released in 2004 by Blizzard Entertainment . The third expansion set , Cataclysm , was released on December 7 , 2010 . World of Warcraft : Cataclysm is the third expansion set for the massively multiplayer online role-playing game ( MMORPG ) World of Warcraft , following Wrath of the Lich King . World of Warcraft : Legion is the sixth expansion set in the massively multiplayer online role-playing game ( MMORPG ) World of Warcraft , following Warlords of Draenor .