Augmented reality (AR) enhances one's current perception of reality by overlaying digital information. This document discusses AR applications on mobile using ARKit and ARCore frameworks. It provides examples like Ikea's AR app and Pokemon Go. ARKit supports many iOS devices from iPhone 6s onward while ARCore currently supports Google's Pixel phones and some Samsung devices. Both require adding an AR container view and handling the session lifecycle to integrate AR features like tracking and plane detection.