From Wikipedia:
A simulation video game describes a diverse super-category of computer and video games, generally designed to closely simulate aspects of a real or fictional reality.
Medical simulations - A genre of video game where players take the role of a surgeon. This includes the Trauma Center and LifeSigns series.
Vehicle simulations - A genre of video game where players experience driving a vehicle. This includes flight simulators, racing games, and games that involve controlling other vehicles like tanks, trains, or boats.
Photo simulations - A genre of video game where players take photographs of animals or people. This includes games such as Pokémon Snap and Afrika.