Quick meaning
A sensor in your phone that detects the brightness of your surroundings and adjusts screen brightness automatically.
Think of it like this
Like automatic sunglasses that get darker in bright light.
Where you may see this
You may hear this when buying a device, asking for repairs, or checking phone and computer settings.
Why it matters
Understanding the hardware term helps you choose the right device and explain problems more clearly when asking for help.
Say it simply
Ambient Light Sensor means: A sensor in your phone that detects the brightness of your surroundings and adjusts screen brightness automatically.