Mankind has always dreamed. He followed these dreams, made an effort to reach his dreams, and in the end, he either achieved these dreams or at least got closer. Technological developments have always been in this direction. Technologies have been dreamed up, some of which have been the subject of science fiction or action movies; These dreams have been realized to a great extent with the scientific studies carried out. Three technologies that have become increasingly popular in recent years; Augmented reality (AR), virtual reality (VR) and mixed reality (MR) are examples of these dreams that were first made into movies and then realized. These concepts, which are often used interchangeably, are different from each other, although they have similar aspects.