What is the function of the auto-brightness feature on the iPhone 5?

I do not want to mess with this setting until I understand it more!

Its a feature that adjusts the brightness based on how dark/light it is in the room/outside, it uses sensors to tell.

It just makes your screen brightness brighter I think it works with the ambient light sensor in the phone to like whenever you're in a dim room your brightness on your screen will lesson the quality of brightness. It's to save battery life on your phone too.

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