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World of Warcraft, often referred to as WoW, is a massively multiplayer online role-playing game (MMORPG) by Blizzard Entertainment. It is the fourth released game set in the fantasy Warcraft universe, which was first introduced by Category: Warcraft: Orcs & Humans - in 1994.This excludes expansion packs and the cancelled Category: Warcraft Adventures: Lord of the Clans - . World of Warcraft takes place within the Warcraft world of Azeroth, approximately four years after the events at the conclusion of Blizzard's previous Warcraft release, Category: Warcraft III: The Frozen Throne - . Blizzard Entertainment announced World of Warcraft on September 2, 2001. The game was released on November 23, 2004, on the 10th anniversary of the Warcraft franchise.

The first expansion set of the game, Category: World of Warcraft - : The Burning Crusade|The Burning Crusade, was released on January 16, 2007. The second expansion set, Category: World of Warcraft - : Wrath of the Lich King|Wrath of the Lich King, was released on November 13, 2008. The third expansion set, Category: World of Warcraft - : Cataclysm|Cataclysm, was announced at BlizzCon 2009.

With more than 11.5 million monthly subscribers, World of Warcraft is currently the world's most-subscribed MMORPG"MMOG Active Subscriptions 21.0", MMOGCHART.COM, June 29, 2006. and holds the Guinness World Record for the most popular MMORPG. In April 2008, World of Warcraft was estimated to hold 62 percent of the massively multiplayer online game (MMOG) market.