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Call of Duty 4: Modern Warfare (aka COD4) is a first-person shooter video game developed by Infinity Ward and published by Activision for Xbox 360, PlayStation 3, and Windows. It is the fourth installment of the Call of Duty video game series, excluding expansion packs. COD4 breaks away from the World War II setting of previous games in the Call of Duty series and is instead set in modern times. The title and game details were announced on April 25, 2007, and the game was released worldwide between November 6, 2007 and November 9, 2007. COD4 became available on Steam on November 6, 2007 for pre-purchase, and was available to play on November 12, 2007.

The Call of Duty 4 story is centered around a fictional near-future conflict involving the United States, the United Kingdom, and Russia, who are fighting against Russian ultranationalists in civil war torn Russia, and rebels that have staged a coup d'état in a small Middle Eastern country.

The multiplayer portion of Call of Duty 4 features various game modes, and contains a leveling system that allows the player to unlock additional weapons, weapon attachments, and camouflage schemes as they advance.

Call of Duty 4: Modern Warfare received considerable praise and has won numerous awards from gaming websites, including IGN's "Best Xbox 360 Game". COD4 was the top-selling game worldwide for 2007, reaching over seven million copies as of January 2008.