One picture to show you the Virtual Reality
The most respected should be immersive virtual reality system.Now the company have achieved product of the virtual reality equipment.
Head mounted display
Google Google glass https://www.google.com/glass/start/
Microsoft Hololens https://www.microsoft.com/microsoft-hololens/en-us
Oculus VR Oculus Rift https://www.oculus.com/en-us/
Sony PlayStation VR(Project Morpheus) https://www.playstation.com/en-gb/explore/ps4/features/project-morpheus/
The google glass and Oculus Rift are already in sale.Google glass and Hololens is different kind of Head mounted display with Oculus Rift and PlayStation VR.
This video can show you some difference between Hololens and Oculus Rift.The first video is come from Microsoft Build 2015 and the second one is come from heise online.
Oculus Rift DK2