Autofocus (AF) is a camera feature that automatically adjusts the lens to focus on the subject. Modern autofocus systems use a variety of technologies, including phase detection and contrast detection, to quickly and accurately determine the correct focus distance. Autofocus can be single-shot (AF-S) for stationary subjects or continuous (AF-C) for moving subjects. Advanced autofocus systems also include face and eye detection, making it easier to focus on people. Autofocus is essential for ensuring sharp images, especially in dynamic or fast-paced shooting environments such as sports or wildlife photography.