Phase detection is a method used in cameras and autofocus systems to quickly determine the focus of a subject. It works by splitting incoming light into two beams and comparing their phases. If the beams are out of phase, the system can adjust the lens position to achieve sharp focus. This technique is commonly found in DSLR cameras and some mirrorless cameras. This autofocus method is efficient and effective, especially in bright conditions. It allows for fast focusing on moving subjects, making it ideal for photography in sports or wildlife settings. Overall, phase detection enhances the user experience by ensuring clear and sharp images.