Head-mounted display

Head-mounted display or HMD is a device worn over your head. It features a display in front of one or both of your eyes. The display streams data, images and other information in front of the wearer's eye(s). Certain HMDs such as Oculus Rift or HTC Vive have displays over both of their users' eyes. Others like Google Glass only have a display over one of the users' eyes.

The majority of Virtual Reality (VR) and Augmented Reality (AR) devices are head-mounted displays. In AR, the display is usually transparent and digital information is superimposed onto real life objects. In VR, the display is not transparent and only virtual information and images are displayed in front of wearer's eyes.