Augmented reality (AR) combines real and virtual elements to enhance one's current perception of reality. AR is interactive and registered in 3D, allowing virtual objects to be overlaid on the real world in real-time. Successful AR requires three components: a display device, a tracking system, and mobile computing power. Current applications of AR include HUDs in vehicles, mobile travel guides, and games that overlay virtual elements onto real environments. Research into AR continues as it could provide instant information to users across many fields like education, medicine, and gaming through seamless integration of real and virtual worlds.