Virtual reality (VR) is a sister technology of AR. As described, AR augments your current experience in the real world by adding digital data to it. In contrast, VR magically, yet convincingly, transports you to a different (computer-generated) world. VR is intended to be a totally immersive experience in which you are no longer in the current environment. The sense of presence and immersion are critical for VR's success.
AR does not carry that burden of creating an entire world. For AR, it is sufficient for computer-generated graphics to be added to your existing world space. Although, as we'll see, that is not an easy accomplishment either and in some ways is much more difficult than VR. They have ...