Virtual reality is a computer-simulated environment that can simulate physical presence in real or imagined worlds. It is considered to have wide-ranging benefits for healthcare, education, gaming, architecture, and the military. Virtual reality environments are usually visual experiences accompanied by sounds, and the person can determine what happens through their actions via sensory stimuli provided by a computer. Some key concerns about virtual reality include potential links to desensitization, depression, anxiety, and problems with empathy or compassion.