FPS may refer to any of the following:
1. Short for frames per second, FPS is a measurement of how many frames a device is capable of rendering each second. It is dictated by the speed of the video card, CPU, and memory in a computer. A user with a higher FPS is capable of performing better and reacting faster than someone with a slower FPS. Many games today have a command or keyboard shortcut key combination that displays the frames per second you are getting. There are also programs, such as Fraps, that display the frames per second you can get with your computer hardware and certain settings. The picture shows a game displaying an FPS of 99.3 or 99 frames per second.
2. FPS is also short for first-person shooter, a genre of video game. In an FPS, the player views the game in a first-person view. Game interaction largely involves moving, aiming, and shooting a gun. First-person shooter games first became popular with the release of Doom in 1993. In the picture, the player has a handgun and is shooting a character in the game.
If you're looking over the shoulder of a character in a game, the game is considered a third-person shooter and not a first-person shooter.