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==Main characteristics==
'''Interactive -''' The user’s input controls the system and guides the behavior of the VR experience, while also modifying the virtual environment. This type of interaction engages the user, connecting him to the application in a more natural way since the environment responds directly to the stimuli . <ref name=”0”></ref>.
'''Immersive -''' An immersive experience has to provide a sense of presence as well as a sense of engagement. Immersion can be divided into three different aspects:
'''1.''' According to Bierbaum (2000), “For a VR application to be immersive, it must be perceptually immersive by providing ‘the presentation of sensory cues that convey perceptually to users that they’re surrounded by the computer-generated environment.’” Therefore, the VR must provide the user with an all-encompassing sensory input . <ref name=”0”></ref>.
'''2.''' The second aspect of immersion is the sense of presence. This implies that the VR experience must give the user the sense they are “in” the virtual world . <ref name=”0”></ref>.
'''3.''' The final aspect is engagement. It is the degree “to which the user has a sense they are deeply involved in the environment.” <ref name=”0”></ref>
'''Multisensory -''' providing a virtual experience that uses multiple human sensory systems increases the level of immersion. While current VR systems cannot provide a full range of stimuli to all human senses, it is expected that in the future this problem will be solved and the VR experience will be completely or almost indistinguishable from reality. The more senses are involved in the VR experience, the higher the degree of engagement and, consequently, this results in a greater sense of presence . <ref name=”0”></ref>.
'''Synthetic -''' The environment is artificial, created by a computer in real-time . <ref name=”0”></ref>.
==Hardware Technologies==
