Original: World of Warcraft has had multiple expansions, namely World of Warcraft: The Burning Crusade, World of Warcraft: Wrath of the Lich King and World of Warcraft: Cataclysm.
Simplified: The MMORPG World of Warcraft is based on these games. Blizzard Entertainment also created World of Warcraft, which was published by Vivendi Games.