The computer simulated of a 3D image or environment that can be intermingled with in a outwardly real or physical way by a person using VR Device such as a helmet with a screen inside or gloves fitted with sensors its called virtual reality.
Right now Virtual reality is the burning topic in the tech industries lots of company are doing development into this technology like Google and they launch Google Daydream device. Other company like Samsung and they launch Device Samsung Gear VR and now it will be implemented not only Android but also in IOS other OS.
Virtual reality guiles your Brain into 3D world it makes virtual world. The first way VR doing with the stereoscopic display it actual works by displaying two different angles of the scene to each eye when you stimulate VR Device creates an almost life like experience.
In short Virtual Reality is future of the technology even we are not getting surprise if our computer screen would be on virtual reality you can handle your all computer works via VR. Only you can see your computer works with more confidential work.