Virtual reality (VR) is a simulated experience that can be similar to or completely different from the real world. Applications of virtual reality include entertainment (e.g. video games), education (e.g. medical or military training) and business (e.g. virtual meetings). Other distinct types of VR-style technology include augmented reality and mixed reality, sometimes referred to as extended reality or XR.

One may distinguish between two types of VR; immersive VR and text-based network VR (also known as "Cyberspace"). The immersive VR changes your view, when you move your head. While both VRs are appropriate for training, Cyberspace is preferred for distance learning. In some cases these two types are even complementary to each other. This page mainly focuses on the immersive VR.

Currently, standard virtual reality systems use either virtual reality headsets or multi-projected environments to generate realistic images, sounds and other sensations that simulate a user's physical presence in a virtual environment. A person using virtual reality equipment is able to look around the artificial world, move around in it, and interact with virtual features or items. The effect is commonly created by VR headsets consisting of a head-mounted display with a small screen in front of the eyes, but can also be created through specially designed rooms with multiple large screens. Virtual reality typically incorporates auditory and video feedback, but may also allow other types of sensory and force feedback through haptic technology.

 

Note:   The above text is excerpted from the Wikipedia article Virtual reality, which has been released under the GNU Free Documentation License.