Microsoft, which designed the HoloLens 2 glasses, defines MR as "a blend of the physical and digital worlds, enabling natural and intuitive 3D interactions between humans, computers, and the environment." . Unlike VR, in which the user interacts in a fully immersive environment with physical controllers, in MR the user wears a helmet visor that lets him/her perceive the real environment around. Digital holograms are embedded in the real environment, creating a mixed environment (real and digital). MR requires no remote control, leaving users hands-free. They can manipulate physical objects and holographic objects according to their needs.