Augmented Reality (AR) is tremendous trend of research and development in cell phone technology, robotics, medical, manufacturing and repair, military training, video gaming and entertainment. In this book attempts have been made to present the study format for Augmented Reality theory and practice. The book is divided in three units. Each unit contains full explanation of theories and solution of research related problems. The first unit introduces about the AR basic theme and its specification and general criteria. Second unit deals with the general practical approach required for the practice of environment development. Third unit deals with the technicality and important aspects of AR research and development.