Augmented reality (AR) is a direct or indirect live view of a physical, real-world environment whose elements are "augmented" by computer-generated perceptual information, ideally across multiple sensory modalities, including visual, auditory, haptic, somatosensory, and olfactory.
This Video demonstrate the fascinating use of Augmented Reality in educational field especially like biology with the use of AR App called HP Reveal (previously called Aurasma) on Smartphones and Tablets.