Head-Mounted-Display
Formal
Head-Mounted-Display is a display device, worn on the head or as part of a helmet that has a small display optic in front of one (monocular HMD) or each eye (binocular HMD).
Practical
A head-mounted display (HMD) is a type of computer display device or monitor that, as the name implies, is worn on the head or is built in as part of a helmet. This type of display is meant for a total immersion of the user in whatever experience the display is meant for, as it ensures that no matter where the uses head may turn, the display is positioned right in front of the users eyes.
