Virtual reality is a computer-generated simulation of an environment that users can interact with. It can range from non-immersive desktop displays to fully immersive head-mounted displays. Key aspects of virtual reality include augmented reality, which overlays computer graphics on the real world, and virtuality continua, which describes the range from completely virtual to completely real environments. Virtual reality aims to provide depth, breadth, and quality of information to create a sense of presence and allow users to explore their imagination.