I'm not really good at explaining but XR can include everything from AR, VR, and MR making it possible for psychical object to co-exist in the virtual/augmented reality while AR " Augmented Reality (AR) is an overlay of computer generated content on the real world. The key note here is that the augmented content doesn't recognize the physical objects within a real-world environment. In other words, the CG content and the real-world content are not able to respond to one another. "