AR is a technology to display digital contents like photo, animation and 3D CG onto real world by using camera.
What triggers to pop up a virtual object can be set by positioning data by GPS sensor, visual recognition or any other receivable signals.
Required devices for AR are smartphones (iPhone and Android), tablet PCs and wearable computer glasses.
Required devices for VR are HMD(head-mounted device) such as Oculus Rift, PlayStation VR and HTC Vive. Simple VR goggles are sold at amazon at affordable price.
Required devices for MR are Microsoft HoloLenz, or newer products to come out.
For a very long time, Media has been speaking highly about AR and VR technology, describing as a hot tech. While some people are skeptical about the technology, it seems that now basic system setup (both hardware and software) are ready for further development. We are certain that the technology can expect much further grow.