The ignition switch and ignition cylinder are two separate components of a vehicle's ignition system. The ignition switch is responsible for providing power to the vehicle's electrical system and activating the starter motor when the key is turned. The ignition cylinder, on the other hand, is the component that the key is inserted into and turned to start the vehicle. The ignition cylinder is typically located on the steering column, while the ignition switch is often located near the dashboard or console. Both components are critical for starting a vehicle, and a malfunction in either component can prevent the car from starting.