Frame Differencing is a technique used in video processing to detect motion by comparing consecutive frames. It works by subtracting the pixel values of one frame from the next, highlighting areas where changes occur. This method is effective for identifying moving objects in a scene. The result of Frame Differencing is a new image that shows the differences, often referred to as a "difference image." Areas with significant changes appear brighter, indicating movement. This technique is commonly used in applications like surveillance systems and object tracking to monitor activities in real-time.