What is the difference between phase detection and contrast detection in terms of autofocus performance?

Phase detection and contrast detection are two different methods used in autofocus systems. Phase detection is generally faster and more accurate than contrast detection. Phase detection works by comparing the phase of light waves coming through different parts of the lens, allowing the camera to quickly determine the correct focus point. Contrast detection, on the other hand, analyzes the contrast between adjacent pixels in the image to determine focus, which can be slower and less accurate, especially in low light conditions.