What does 'auto' mean on car headlights?

[DiAddyson]

Auto on car headlights refers to the automatic headlight function. Here is more information about it: 1. Automatic headlights, whose full name can be called 'automatic light-sensing headlights,' primarily rely on a key component, the ambient light sensor, to determine whether the lights need to be turned on. 2. When the brightness of the external environment falls below a certain threshold, it will automatically control the headlights to turn on; when the external brightness exceeds a certain level, the headlights will automatically turn off. 3. The advantage of automatic headlights is that they can automatically control the turning on and off of the lights. For example, when suddenly entering a tunnel during the day and forgetting to turn on the lights, the automatic headlights can be quite user-friendly. Or during dawn or dusk when the light is poor, the headlights will turn on by themselves to illuminate the road ahead, significantly improving safety.