This document discusses augmented reality (AR), which combines real and virtual scenes. It provides examples of AR applications in various fields like sports, games, aircraft, movies, and advertisements. It also describes a medical application of AR to treat phobias. The document outlines the hardware components needed for AR like displays, sensors, and processors. Examples of AR technologies like Google Glass and BMW augmented reality are presented. The advantages of AR include improved interaction and training capabilities, while disadvantages relate to privacy concerns and maintaining AR systems.