Extended Reality (XR) is an umbrella term for immersive technologies; Virtual Reality, Augmented Reality and Mixed Reality.
Virtual reality (often just called VR) is, simply put, the name for computer technology that makes a person feel like they are somewhere else. It uses software to produce images, sounds, and other sensations to create a different place so that a user feels like he, she or they is really part of this other place.
Augmented reality (AR) is the rendering of digital images or data onto real-world objects.
Mixed reality (MR) is a blend of physical and digital worlds, unlocking natural and intuitive 3D human, computer, and environmental interactions.