Call of Duty 2 in the context of Pocket PC

Call of Duty is a first-person shooter military video game series and media franchise published by Activision, starting in 2003. The games were first developed by Infinity Ward, then by Treyarch and Sledgehammer Games. Several spin-off and handheld games were made by other developers. The most recent, Call of Duty: Black Ops 7, was released on November 14, 2025.

The series originally focused on a World War II setting, with Infinity Ward developing Call of Duty (2003) and Call of Duty 2 (2005) and Treyarch developing Call of Duty 3 (2006). Infinity Ward's Call of Duty 4: Modern Warfare (2007) introduced a modern setting and proved to be the breakthrough title for the series, creating the Modern Warfare sub-series; a Modern Warfare remastered version was released in 2016. Two other entries, Modern Warfare 2 (2009) and Modern Warfare 3 (2011), were made. The sub-series received a reboot with Modern Warfare in 2019, Modern Warfare II in 2022, and Modern Warfare III in 2023. Infinity Ward has also developed two games outside of the Modern Warfare sub-series, Ghosts (2013) and Infinite Warfare (2016).

Infinity Ward, Inc. is an American video game developer. They developed the video game Call of Duty, along with seven other installments in the Call of Duty series. Vince Zampella, Grant Collier, and Jason West established Infinity Ward in 2002 after working at 2015, Inc. previously. All of the 22 original team members of Infinity Ward came from the team that had worked on Medal of Honor: Allied Assault while at 2015, Inc. Activision helped fund Infinity Ward in its early days, buying up 30 percent of the company, before eventually fully acquiring them. The studio's first game, World War II shooter Call of Duty, was released on the PC in 2003. The day after the game was released, Activision bought the rest of Infinity Ward, signing employees to long-term contracts. Infinity Ward went on to make Call of Duty 2, Call of Duty 4: Modern Warfare, Call of Duty: Modern Warfare 2, Call of Duty: Modern Warfare 3, Call of Duty: Ghosts, Call of Duty: Infinite Warfare, the Modern Warfare reboot, and its sequel.

Co-founder Collier left the company in early 2009 to join parent company Activision. In 2010, West and Zampella were fired by Activision for "breaches of contract and insubordination", they soon founded a game studio called Respawn Entertainment. On May 3, 2014, Neversoft was merged into Infinity Ward.