Virtual reality is an artificial environment that is created with software and presented to the user in such a way that the user suspends belief and accepts it as a real environment. On a computer, virtual reality is primarily experienced through two of the five senses: sight and sound.
The simplest form of virtual reality is a 3-D image that can be explored interactively at a personal computer, usually by manipulating keys or the mouse so that the content of the image moves in some direction or zooms in or out. More sophisticated efforts involve such approaches as wrap-around display screens, actual rooms augmented with wearable computers, and haptics devices that let you feel the display images.
History of VR
The current life cycle of virtual reality may have begun when the earliest prototypes of the Oculus Rift showed up at the E3 videogame trade show in 2012, but it’s been licking at the edges of our collective consciousness for more than a century. The idea of immersing ourselves in 3-D environments dates all the way back to the stereoscopes that captivated people's imaginations in the 19th century. If you present an almost identical image to each eye, your brain will combine them and find depth in their discrepancies; it's the same mechanism that View-Masters used to become a childhood staple.
When actual VR took root in our minds as an all-encompassing simulacrum is a little fuzzier. As with most technological breakthroughs, the vision likely began with science fiction—specifically Stanley G. Weinbaum’s 1935 short story “Pygmalion’s Spectacles,” in which a scientist devises a pair of glasses that can "make it so that you are in the story, you speak to the shadows, and the shadows reply, and instead of being on a screen, the story is all about you, and you are in it."