A shooter game focuses primarily on combat involving projectile weapons, such as guns and missiles. They can be divided into first-person and third-person shooters, depending on the camera perspective. Some first-person shooters use light gun technology.

Doom, one of the earliest major first-person shooter games.
First-person shooter video games, commonly known as FPSs, emphasize shooting and combat from the perspective of the character controlled by the player. This perspective is meant to give the player the feeling of "being there", and allows the player to focus on aiming. Most FPSs are very fast-paced and require quick reflexes on high difficulty levels. The fast-paced and 3D elements required to create an effective looking FPS made the genre technologically unattainable for most consumer hardware systems until the early 1990s. Wolfenstein 3D was the first widely known FPS, and Doom was the first major breakthrough in graphics; it used a number of clever techniques to make the game run fast enough to play on consumer-grade machines. Since the release of Doom, most FPS games now have a multi-player feature to allow competition between multiple players. Team Fortress 2, Halo 3, Killzone 2 and Unreal Tournament 3 are some of the notable games of the past few years in this genre.
Massively multiplayer online first person shooter games (MMOFPS) are a genre of massively multiplayer online games that combines first-person shooter game play with a virtual world in which a large number of players may interact over the Internet. Whereas standard FPS games limit the number of players able to compete in a multiplayer match (generally the maximum is 64), hundreds of players can battle each other on the same server in an MMOFPS. And because of this information I received .Know I have a grate idea for my game so thank you for this information .I will combined game ideas to make the perfect game