Virtual reality (VR) typically refers to computer technologies that use virtual reality headsets to generate the realistic images sounds and other sensations that replicate a real environment or create an imaginary setting.

In WIKI VR id defined by the following statement:

VR also simulates a user's physical presence in this environment. VR has been defined as "a realistic and immersive simulation of a three-dimensional (3D) 360 degree environment".

VR has many occasions to use. Firs