Virtual reality (VR) is a computer-generated 3D environment that users can explore and interact with through sight and sound. While using VR, users feel immersed in the virtual world. The history of VR dates back to the 1950s, with modern VR headsets like the Oculus Rift emerging in the 21st century. VR works by displaying two separate images for the left and right eyes to create a 3D effect. VR has applications in fields like healthcare, education, and engineering, but can also cause issues like addiction, communication deception, and motion sickness.