A first-person shooter (FPS) is a genre of video game that is centered on gun fighting and other weapon-based combat seen from a first-person perspective, with the player experiencing the action directly through the eyes of the main character. The genre has been around for nearly 50 years and has had waves of tremendous popularity and serious decline, but it always comes back as new generations of game designers bring fresh ideas and technical excellence to the concept. FPS games typically emphasize shooting/combat as a core part of the experience, and the more a game emphasizes shooting, the more likely it is to be considered part of the genre. Some of the most popular FPS games include Call of Duty, Half-Life, Doom, and Halo. The genre is constantly evolving, and developers are always looking for ways to innovate and improve the FPS experience.