Autofocus is a camera feature that automatically adjusts the lens to focus on a subject. This technology helps photographers capture sharp images without manually adjusting the focus. Autofocus systems use sensors to detect contrast or phase differences in the light coming through the lens, allowing the camera to determine the correct focus distance. There are different types of autofocus systems, including contrast detection and phase detection. Contrast detection measures the sharpness of the image, while phase detection uses a dedicated sensor to quickly calculate focus. Many modern cameras, including DSLRs and mirrorless cameras, come equipped with advanced autofocus capabilities for improved performance.