This document summarizes a lecture on augmented reality given by Victor Alvarez from the University of Oviedo. The lecture discussed how augmented reality mixes real and virtual objects to create mixed reality experiences. It covered early examples of augmented reality from films and virtual worlds. Key concepts discussed include using devices and sensors to interact with virtual information overlaid on reality, as well as tracking, registration and different types of virtual objects. The lecture concluded with an exercise in designing augmented reality experiences.