(
Augmented 
Reality/
Virtual 
Reality)  Refers to computer-generated simulations that integrate the real world (AR) or are entirely self-contained (VR).  AR applications allow people to move around in the room.  However, with VR, one must remain seated or stand in a relatively small circle because the surroundings are not visible.  See 
AR/VR headset, 
augmented reality, 
virtual reality and 
augmented virtuality.