What is the different between AR, VR & MR

Virtual Reality (VR): 

Virtual reality refers to a 3D computer generated a digital environment which can be explored by users with electronic devices like headsets, body sensors, and treadmill. The technology allows users to perceive and interact with the simulated environment as though it were real.

You need to wear a special VR headset to experience virtual reality. Most VR headsets are connected to a computer (Oculus Rift) or a gaming console (PlayStation VR) but there are standalone devices (Google Cardboard is among the most popular) as well. Most standalone VR headsets work in combination with smartphones – you insert a smartphone, wear a headset, and immerse in the virtual reality.

Have you ever noticed a small cardboard icon when watching videos on YouTube? It enables the 360-degree mode that means you can wear a VR headset and experiences fully immersive videos. 360-degree videos are considered a form of VR.

Augmented Reality(AR):

Augmented reality is basically the technology that overlays digital content over physical real-world objects. AR works by adding 2D or 3D layered content on top of real-world objects or locations, allowing the user to see additional content.

If you own a modern smartphone, you can easily download an AR app and try this technology. There’s a different way to experience augmented reality, though – with special AR headsets, such as Google Glass, where digital content is displayed on a tiny screen in front of a user’s eye.

Mixed Reality (MR):

Mixed reality (MR) is similar in definition to AR, however, opposed to simply placing images and text over the top of RR this technology aims to create an environment in which the user will treat the objects as if they are really there. 

This can be seen with applications such as Skype and video viewing on Microsoft’s HoloLens, but also extends to 2D video wherein an observer is able to view a user of virtual reality (VR) within the environment that their head-mounted display (HMD) is showing to them. A user in a virtual space which entirely encompasses their vision viewed from the outside can still be defined as MR.