Imitation of some real devices using in the training of civilian and military personnel. Vehicle sims are trucks, cars, airplanes, helicopters, boats, submarines, spaceships, space stations, motorcycles, and so on.

Games are played using an electronics device with a visual display. Historically videogames distinguish between computer games and coin-operated arcade games because different play activities. The current major videogame consoles are
Sony’s PlayStation 2 (PS2)
Nintendo’s GameCube
Microsoft's Xbox
Nintendo's Game Boy Advance SP (portable console).

Computer -simulated environment intended for its users to inhabit and interact with via avatars. This habitation usually is represented in the form of two or three-dimensional graphical representations of humanoids (or other graphical or text-based avatars).
The world creates similar to the real world, with real world rules such as gravity, topography, locomotion, real-time, and communication.
The first virtual worlds presented on the internet were communities and chat rooms, later were created for video/computer games.