Call of Duty is an award winning first-person shooter video game series franchise. The series began on the PC, and later expanded to consoles and handhelds, and several spin-off games have also been released alongside the main series. The majority of the games in the series have been set in World War II, with the exception of Call of Duty 4: Modern Warfare and Modern Warfare 2, which are set in modern times.

The Call of Duty video games are published by Activision and Aspyr Media and have been developed primarily by Infinity Ward, with other games being developed by Treyarch, Gray Matter Interactive, Spark Unlimited, Pi Studios, Amaze Entertainment, and Rebellion Developments, using a variety of game engines including the "id Tech 3" and the "Treyarch NGL." Other products in the franchise include a line of action figures designed by Plan-B Toys and a card game created by Upper Deck. Call of Duty is a first-person shooter video game based on the Quake III Arena engine (id Tech 3), and was released on October 29, 2003. The game was developed by Infinity Ward and published by Activision.

The game simulates the infantry and combined arms warfare of World War II. Call of Duty was accompanied in September 2004 by an expansion pack, Call of Duty: United Offensive, which was also produced by Activision, but developed by Gray Matter Interactive with contributions from Pi Studios. The Mac OS X version of the game was ported by Aspyr Media.

In late 2004, the N-Gage version was developed by Nokia and published by Activision. Other versions were released for PC, including Collector's Edition (with soundtrack and strategy guide), Game of the Year Edition (includes game updates), and the Deluxe Edition (which contains the United Offensive expansion and soundtrack; in Europe the soundtrack was not included). Since November 12, 2007, Call of Duty and its sequels have been available for purchase via Valve's content delivery platform, Steam.

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