Virtual Reality

Virtual reality is an artificial environment created with software .VR headset is the gadget from which we can experience virtual things in real world. It means that experience that things which is not present in real world  for example, by wearing VR headset there is a video playing which is 3D and you are experiencing a scene of  200 years ago or you are watching a football match in the staudim but you are not  actually in the stadium. 
It is a simulation in which we think  we are at that place which is streaming in the video we are watching, we can view in all directions such as we can view in real life.   

Putting it another way, virtual reality is essentially:

1. Believable: You really need to feel like you're in your virtual world (on Mars, or wherever) and to keep believing that, or the illusion of virtual reality will disappear.
2. Interactive: As you move around, the VR world needs to move with you. You can watch a 3D movie and be transported up to the Moon or down to the seabed—but it's not interactive in any sense.
3. Computer-generated: Why is that important? Because only powerful machines, with realistic 3D computer graphics, are fast enough to make believable, interactive, alternative worlds that change in real-time as we move around them.
4. Explorable: A VR world needs to be big and detailed enough for you to explore. However realistic a painting is, it shows only one scene, from one perspective. A book can describe a vast and complex "virtual world," but you can only really explore it in a linear way, exactly as the author describes it.
5. Immersive: To be both believable and interactive, VR needs to engage both your body and your mind. Paintings by war artists can give us glimpses of conflict, but they can never fully convey the sight, sound, smell, taste, and feel of battle. You can play a flight simulator game on your home PC and be lost in a very realistic, interactive experience for hours (the landscape will constantly change as your plane flies through it), but it's not like using a real flight simulator (where you sit in a hydraulically operated mockup of a real cockpit and feel actual forces as it tips and tilts), and even less like flying a plane.

What gadget do we need for virtual reality?

• High-end headsets
• Oculus Rift
• Head-mounted displays (HMDs)
• Immersive rooms
• Datagloves
• Wands

Applications of virtual reality

• Eduaction
• Scientifc visulaization
• Medicine
• Games  and entertainment