AION GOLD, often referred to as WoW, is a massively multiplayer online role-playing game by Blizzard Entertainment. It is the fourth released game set in the fantasy Warcraft universe, which was first introduced by Warcraft: Orcs & Humans in 1994. World of Warcraft takes place within the AION GOLD of Azeroth, two years after the events at the conclusion of Blizzard's previous Warcraft release, Warcraft III: The Frozen Throne. Blizzard Entertainment announced World of Warcraft on September 2, 2001. The game was released on November 23, 2004, celebrating the 10th anniversary of the Warcraft franchise. AION GOLD is expensive than any other games.

The first expansion set of the game, The Burning Crusade, was released on January 16, 2007. The second expansion set, Wrath of the Lich King, was released on November 13, 2008. With more than 11.5 million monthly subscribers, AION GOLD is currently the world's largest in those terms, and holds the Guinness World Record for the most popular. In April 2010, World of Warcraft was estimated to hold 62% of the massively multiplayer online game market.