Virtual reality is an immersive simulation of three-dimensional images or environments generated by a computer. Once thought to be the stuff of science fiction, virtual reality now is on the verge of widespread adoption. It has vast potential as a tool for education, job training, military exercises, and psychological therapy. Scientists and engineers are developing new ways to incorporate sensory data into virtual reality systems, enabling people to immerse themselves in other realities.

Current status : a simulated world -- Problems : getting a sense of being there -- Solutions : achieving and maintaining presence -- Solutions : appealing to the senses -- Solutions : reducing motion sickness.