Call of Duty is an action-packed first-person shooter video game series developed by Infinity Ward and published by Activision. The series began in 2003, and has since grown to include multiple sub-series, such as Modern Warfare, Black Ops, and Zombies. The games typically feature a campaign mode that follows a linear narrative and allows players to take on the role of a soldier, as well as a multiplayer mode that pits players against each other in intense combat. The series' signature feature is its cinematic and intense graphics, which provide a realistic and immersive experience for players. In addition to the core games, Activision has also released several companion apps for iOS and Android devices. These apps allow players to stay connected with their friends, track their progress in the game, and customize their loadouts.
Unreal is more of an arena shooter with a focus on map control / power-up. As stated in Call of Duty, it is based on "rambo-like" lone wolf combat, with an emphasis on player-controlled weapon sets and customization.