Virtual Reality (VR), sometimes called Virtual Environments (VE) has drawn much attention in the last few years. The Virtual Reality uses a huge number of technologies to produce a Virtual world so that a user can interact and manipulate with the virtual objects in the so produced Virtual Worlds. With the aid of some specially developed gadgets like a Head Mounted Display, Electronic Glove and Mechanical armatures that fit the human organs we can immerse the human into the Virtual world. The simulation technique is combined with the motion of the human to produce the output that what human expects for. For example the person in a Virtual world looks at a particular object then he has to get the feeling that he is actually looking at that object and he should also get the feeling of the sounds that come from that object. In this paper a historical overview of virtual reality is presented, types, architecture of VR systems are listed, followed by applications of this technology in science, work, and entertainment areas. Finally, the future of VR is considered.
Virtual Reality is a way for humans to visualise, manipulate and interact with computers and extremely complex data.
Here the word visualisation refers to the computer-generated outputs such as computer graphics, simulations, and other such as the CAD models. Here the outputs may be animations that can be controlled easily by scripts. Here the human can directly interact and manipulate with these animations. The most difficult thing in the Virtual Reality is to produce the interaction between Virtual world and the human but not the production of the Virtual world. The type of Virtual Reality in which the human is actually immersed into the Virtual world is called the immersive Virtual Reality. In such a type of Virtual Reality the human is completely isolated from the outside world and he is placed an entirely computer generated world.