 1968 Virtual reality

Virtual reality (VR) is a technology which allows a user to interact with a computer-simulated environment.Most current virtual reality environments are primarily visual experiences, displayed either on a computer screen or through special or stereoscopic displays, but some simulations include additional sensory information, such as sound through speakers or headphones.In 1968, Ivan Sutherland, with the help of his student Bob Sproull, invented what is widely considered to be the first virtual reality and augmented reality (AR) head mounted display (HMD) system.