Virtual reality (VR) is an artificial world that does not exist in nature, into which a person can completely "immerse himself" not only as an observer but also as a participant.

Virtual reality systems are technical devices and software that create for a person the illusion of presence in this artificial world and in some cases allow manipulating his objects.Most all virtual reality systems have (or should have) the following main characteristics:- Simulation in real-time.

The virtual reality system should provide the user with a picture, sound, as well as a complex of tactile and other sensations (if any) in response to the actions performed, instantly, without noticeable delays.- Realistic simulation of the user's environment.

Typically, individual systems are based on display devices that can only be operated by one person (helmets, goggles, etc.).

Collaborative systems are created on the basis of display facilities available to several users at once.

A person has binocular vision, that is, he perceives the world with both eyes at once.