Virtual reality is a computer simulations of reality that are very similar to real-life experience. This is a huge system. To enter virtual reality, you have to tahe special head-mounted display which enables you to see the images as three dimensional 3D and hear the sounds. When you turn your head other side, computer set the image that where you turn. Also, there is a glove that gives you sense of what you touch. It is exciting and advanced technology.
This system is used for medical training such as making a surgeon and used for training pilots. It has no risk and it's easy. It can be used to help people overcom irrational fears such as scared of spiders. For instance, you set the wild in VR, and people who are scared enter the machine. And they are getting used to what they scared about with time.
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