Activision is an American video game publisher founded in 1979, recognized for creating and distributing some of the industry's most successful franchises, including Call of Duty, World of Warcraft, and Diablo. The company merged with Blizzard Entertainment in 2008 to form Activision Blizzard, which has become one of the largest gaming firms worldwide. Activision develops and publishes games across consoles, PC, and mobile platforms, influencing global gaming trends and market dynamics.