Explain the concept of "virtual reality."

What will be an ideal response?

The virtual world is a graphical, often 3D environment in which users can immerse themselves, interacting with virtual objects and with one another using avatars. These simulated environments create virtual reality, a term that describes what people experience when some of their sensory input is not from the real world, but from a computer-generated one. Advanced virtual reality systems enhance the illusion of physical immersion in a virtual world even further by adding other technologies. Stereoscopic goggles, for instance, can present aspects of the virtual world that match the user's actual body posture, movements, or head turns. Specially wired gloves can reproduce the sensations of actually touching and manipulating virtual objects.