Why do power windows work with key out of ignition cylinder?

Power windows typically work with the key out of the ignition because they're connected to the car's battery through a separate circuit that remains active even after the ignition is switched off. This is a safety feature; it allows you to roll down windows to escape a vehicle in an emergency, even if the ignition is off or the battery is dying. The circuit is designed to be separate from the ignition system, ensuring the power windows remain operational in such situations.