World of Warcraft is the first online game produced by Blizzard Entertainment, a famous game company, which belongs to a massively multiplayer online role-playing game. The game is based on the plot of the real-time strategy game "Warcraft" produced by the company. Relying on the historical events and heroes of Warcraft, World of Warcraft has a complete historical background timeline. Players take risks, complete tasks, take new adventures, explore the unknown world and conquer monsters in World of Warcraft.