The ignition barrel, also known as the ignition switch or ignition lock, is a key component on a motorcycle that controls the electrical system and allows the engine to start. Located on the handlebars or the steering column, it requires the insertion of a key to activate the motorcycle’s ignition system and start the engine. The ignition barrel also typically includes positions for turning the key to switch between different modes, such as "On," "Off," "Run," and "Start." It plays a crucial role in both securing the motorcycle and controlling its electrical functions.