What's the difference between vr and ar? What's the difference between VRAR?

Virtual reality, referred to as VR technology, is also called artificial environment.

Computer or other intelligent computing devices are used to simulate the three-dimensional virtual world, providing users with visual, auditory, tactile and other sensory simulations, so that users can experience it as if they were in the real world.

The characteristics of VR: people can't see the real scene outside the helmet, and they are all computer-generated virtual images.

The following is a typical case of VR used in the military: immersive training simulation application in military virtual reality training and task execution.

AR（Augmented Reality）

Augmented reality (AR technology for short) is characterized by the combination of reality and reality, which superposes the information of virtual objects with the real world to enhance the sense of reality. Its visual presentation is a way of superimposing holographic images and strengthening its visual presentation when human eyes are connected with the real world.

AR features: people can see virtual and real images.

For example, the following AR case video: training close combat (CQB) with augmented reality-umbra simulation framework.