The so-called virtual reality, as the name suggests, is the combination of virtual and reality. In theory, Virtual Reality (VR) is a computer simulation system that can create and experience virtual worlds. It uses a computer to generate a simulation environment to immerse users in the environment. Virtual reality technology is the use of real-life data, through the electronic signals generated by computer technology, combined with various output devices to transform into a phenomenon that people can feel, these phenomena can be real and real objects It can also be a substance that we can't see with the naked eye, and it is expressed by a three-dimensional model. Because these phenomena are not what we can see directly, but the real world that is simulated by computer technology, it is called virtual reality.
Virtual reality technology has been recognized by more and more people. Users can experience the most real feelings in the virtual reality world. The authenticity of the simulated environment and the real world are difficult to distinguish between true and false, and people have an immersive feeling. At the same time, virtual reality has all the human perception functions, such as auditory, visual, tactile, taste, smell and other perception systems; finally, it has a powerful simulation system that truly realizes human-computer interaction and enables people to operate. In, you can operate at will and get the most realistic feedback from the environment. It is the existence, multi-perception, and interactivity of virtual reality technology that has made it popular with many people.
1. The first stage (before 1963) with the simulation of acoustic shape is the stage of implication of virtual reality
In 1929, Edward Link designed the simulator for training pilots; in 1956, Morton Heilig developed the multi-channel simulation experience system Sensorama.
2. The second stage (1963-1972) nascent stage of virtual reality
In 1965, Ivan Sutherland published the paper "UltimateDisplay" (the ultimate display); in 1968, Ivan Sutherland developed a helmet-mounted stereo display (HMD) with a tracker; in 1972, NolanBushell developed the first interactive video game Pong . 
3. The third stage (1973-1989), the generation of virtual reality concept and the initial stage of theoretical formation
In 1977, Dan Sandin et al. developed the data glove SayreGlove; in 1984, the NASA AMES Research Center developed a virtual environment visual display for Mars detection; in 1984, VPL's Jaron Lanier first proposed the concept of "virtual reality"; in 1987, Jim Humphries designed the earliest prototype of the Binocular Omnidirectional Monitor (BOOM).
4. The fourth stage (1990-present) further improvement and application of virtual reality theory
In 1990, VR technology was proposed to include 3D graphics generation technology, multi-sensor interaction technology and high-resolution display technology; VPL developed the first sensor glove "DataGloves", the first set of HMD "EyePhoncs"; since the 21st century, VR The technology is developing at a high speed and the software development system is constantly improving.