"Call of Duty" is one of the most iconic and successful video game franchises in the industry. The series has been developed by various companies, primarily Infinity Ward, Treyarch, and Sledgehammer Games, and published by Activision.

The "Call of Duty" series is known for its first-person shooter (FPS) games centered around wartime themes, offering a wide range of titles set in different historical eras, from World War II to modern and futuristic warfare. Some of the most well-known titles in the series include:

Call of Duty: The original game was released in 2003 and took place during World War II, offering an engaging single-player campaign and multiplayer modes.

Call of Duty 4: Modern Warfare: This title, released in 2007, brought the series into the modern era and redefined the FPS genre with a gripping storyline and highly competitive multiplayer mode.

Call of Duty: Black Ops: This subseries introduced elements of espionage and conspiracy in complex plots and achieved great success with games like "Black Ops" (2010), "Black Ops II" (2012) and "Black Ops III" (2015).

Call of Duty: Modern Warfare (2019): A reboot of the "Modern Warfare" series released in 2019, praised for its intense storyline and high-quality graphics.

The "Call of Duty" series is also known for its competitive multiplayer and fast-paced gameplay, including modes like Team Deathmatch, King of the Hill, and Capture the Flag. Additionally, many titles offer a cooperative mode called "Zombies," where players must survive waves of the undead.

In addition to the main games, the "Call of Duty" series has spawned a range of spin-offs and subseries, including "Call of Duty: Warzone," a popular free-to-play battle royale mode, and "Call of Duty: Mobile" for mobile devices.

"Call of Duty" has achieved enormous commercial success and has a vast global fan base. It is known for its high-budget productions, cinematic campaigns, and innovations in first-person shooter gameplay. The series continues to evolve and release new titles to cater to player preferences and trends in the video game industry.