Strap on a headset and enter a computer-generated world where interactions and movement bring person and machine closer together. As a simulation, experiences can vary from closely matching the real world, through to fantastical environments limited only by the imagination of their developers. VR is typically broken down into three categories- non-immersive, semi-immersive, and fully-immersive. A non-immersive example would appear on a normal screen, semi-immersive might add a headset, while fully-immersive combines headset and motion-sensitive controls. VR applications are extensive and include video gaming, training simulations including in military, healthcare and business, and travel and leisure.