| Main types of VR(Classified by display technology) 
Adventure games, MUD/MOO
Textually described virtual worlds where the user perceives
of the virtual environment through mental images based on the words
read (like reading a novel).
Desktop
3D virtual environment graphically displayed on a desktop computer monitor.
Semi-immersive
3D environment projected onto a large screen (e.g. in
a 'CAVE'). Enables a single user to demonstrate concepts to a large
group of people without them having to don special equipment.
Immersive
3D environment seen through a head-mounted display (HMD). In a completely
immersive system the user feels part of the environment (experiences a feeling of
'presence').
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