A flash sync socket is a port on a camera that allows an electronic flash or studio light to be connected via a cable, enabling the flash to be triggered remotely from the camera body. This allows photographers to position the flash at a distance from the camera for more creative and controlled lighting setups.
Flash sync sockets are commonly used in studio photography and advanced lighting scenarios, giving photographers the flexibility to control light direction, reduce harsh shadows, and achieve more professional-looking results. They are an essential feature for off-camera flash techniques and are compatible with many electronic flashes and lighting systems.