Virtual Reality (VR) is a technology that allows a user to interact with a computer-simulated world, whether that environment is real or virtual.
An environment is a representation of the real or imagined world. It is the key to being able to experience, feel, and touch the past, present, and future. It is the channel through which we can create our own universe, our own personalized reality. It might be anything from making a video game to taking a virtual walk across the universe, from going through our own ideal house to stepping on an alien planet.