VR glasses also called 3D goggles are devices which gives you an experience of virtual reality with the use of your smartphone. All you need to do is insert your phone into the VR glasses (goggles). The screen is then split into two parts, each part is seperatelly projected in left and right eye and our brain combine two images into a 3D experience. This is the most price effective way of having a very good quality 3D experience without the need for extra electronics and screens as e.g. Oculus Rift.