What is World of Warcraft?
World of Warcraft is a massively multiplayer online role-playing game (MMORPG). In World of Warcraft, thousands of players will have the opportunity to adventure together in an enormous, persistent game world, forming friendships, slaying monsters, and engaging in epic quests that can span days or weeks.

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Like most (all) mmorpgs, world of warcraft has its own economy based upon an intangible currency, in this case WOW Gold. World of Warcraft gold is used to allow players for trading and purchasing items. Beyond WOW Gold, Blizzard has taken further steps and includes copper coins, silver coins, and gold coins. 100 copper coins = 1 silver coin; and since I have not stuck gold yet, I believe 100 silver coins = 1 gold coin.