For example a first-person shooter is still a first-person shooter regardless of whether it takes place in a science fiction, western, fantasy, or military setting so long as it features a camera mimicking the perspective of the protagonist ( first-person) and gameplay centered around the use of ranged weaponry. Video game genres are not usually defined by the setting or story of the game or its medium of play, but by the way the player interacts with the game.
A video game genre is a specific category of games related by similar gameplay characteristics.