irtual reality(VR) is a computer-simulated environment that can simulate physical presence in places in the real world or imagined world. Most current virtual reality environments are primarily visual experiences, displayed either on a computer screen or through special stereoscopic displays, but some simulations include sensory information, such as sound through speakers or headphones.

ugmented reality(AR) is a live, copy, view of a physical, real-world environment whose elements are augmented(or supplemented) by computer-generated sensory input such as sound, video, graphics or GPS data. It is related to a more general concept called mediated reality, in which a view of reality is modified by a computer.