A car cut out, also known as an engine cut-off switch or simply a cut-off switch, is a safety device installed in vehicles to prevent unauthorized use or theft. It allows the owner to disable the engine's ignition system, effectively stopping the engine from running. This feature can be particularly useful in deterring theft, as it renders the vehicle inoperable even if the thief manages to start the engine. Car cut-outs are often integrated into advanced car alarms or tracking systems, providing an additional layer of protection for the vehicle and its contents.