This document discusses aperture and shutter speed in photography. It explains that aperture controls the size of the shutter opening and the amount of light entering the camera, which determines depth of field. Shutter speed controls how long the shutter stays open and is measured in fractions of a second, with faster speeds stopping action and slower speeds allowing more light. The document provides examples of photos taken with different aperture and shutter settings and instructs students to practice adjusting these settings to take photos demonstrating their understanding.