What is Virtual Reality

Virtual reality (VR) is a simulated experience that can be similar to or completely different from the real world. Applications of virtual reality can include tourism, real estate walk through and educational purposes (i.e. medical or military training). 
Have a look at this 3 d image below and rotate it with your mouse.  You can view it on your mobile or headset, too.  
On computer screen, grab the image with mouse and rotate it in all directions.  
On mobile, make it full screen, hold in in front of you, and turn around yourself to enjoy the view from all sides.  
In VR headsets (Mobile based), click on the VR icon on the tour screen and it will make the images into 2 parts.  Put your mobile in the VR headset, wear it and roam around to get the experience.