External synchronization in cameras serves to coordinate and align the imaging or capturing process with external devices or events. This capability ensures that the camera captures images or data at specific times or intervals set by an external source, such as a trigger or another device. It's particularly valuable in applications requiring coordinated image capture across multiple cameras, precise timing, or synchronization with other equipment, enabling the seamless integration and control of the imaging process in various industries like robotics, motion analysis, industrial automation, and more.