World of Warcraft, developed by Blizzard Entertainment, launched on November 23, 2004, as a massively multiplayer online role-playing game set in the fictional world of Azeroth. Building on the Warcraft real-time strategy franchise, it allowed thousands of players to simultaneously explore, complete quests, and interact within a persistent online world. The game reached over 12 million monthly subscribers by 2010, establishing a subscription-based model that shaped the MMORPG genre for the following decade.