Excerpt from 'Virtual reality' 2017 in Wikipedia, the free encyclopedia, Wikimedia Foundation Inc., viewed 20 July 2017, https://en.wikipedia.org/wiki/Virtual_reality

Virtual reality (VR) is a computer technology that uses Virtual reality headsets, sometimes in combination with physical spaces or multi-projected environments, to generate realistic images, sounds and other sensations that simulate a user's physical presence in a virtual or imaginary environment. A person using virtual reality equipment is able to look around the artificial world, and with high quality VR move about in it and interact with virtual features or items. VR headsets are head-mounted goggles with a screen in front of the eyes. Programs may include audio and sounds through speakers or headphones.