A latching relay, also known as a bistable relay, is an electrical device designed to maintain its switching state without needing continuous power. Unlike conventional relays, which require a constant current to keep a switch in either the open or closed position, latching relays only need a short pulse of current to change their state. Once the state is set—whether "on" or "off"—it will remain in that state until another pulse is sent to change it. This feature is especially beneficial for systems that require energy savings or are limited by power constraints.