This document provides definitions and explanations of common photographic terminology: - Shutter speed determines how long the camera's shutter is open, with faster speeds freezing motion and slower speeds creating blur. For handheld shots, shutter speeds of 1/250 sec or faster are recommended to avoid blur from camera shake. - ISO controls the camera sensor's sensitivity to light. Higher ISO allows faster shutter speeds or use in low light but results in grainier images. Lower ISO gives clearer images but requires more light. - Aperture and depth of field - Aperture refers to the size of the camera lens opening. A wide aperture gives a shallow depth of field, blurring the background/foreground. A narrow aperture gives a