Extended Reality (XR) refers to all real and virtual environments generated by computer and wearables. The X in XR encompasses all other letters AR, MR, VR. The content that is interacted with ranges from real-world content such as sound, images, videos or 360° videos to computer generated 2D or 3D models, characters, animations, worlds and from mono or spatial sound to haptic feedback and smell, blended together as required.
Augmented Reality (AR) overlays computer generated content on top of our real world. You may interact with it, but AR is not really aware of specific real world objects.
Mixed Reality (MR) is like AR but is also context aware and allows to interact with objects in the real world.
Virtual Reality (VR) is fully immersive, therefore blocks out your view of the real world and can also include all of the content mentioned above.
360° VR Video (360° VR) is based on real-world capture that can be mixed with computer generated elements. It is fully immersive when viewed with a VR headset, but can also be watched on a 2D screen. The immersion is best as a 3D 360° video with ambisonic sound. The content can be interactive.