One thing I learned about the article Cambridge in Colour is that you don't want to overexposed, or underexposed.
And there's this thing called Exposure Triangle. It has aperture, ISO, and shutter speed.
Aperture controls the area over which light can enter you camera. The shutter speed controls the duration of the exposure. And ISO controls the sensitivity of the camera's sensor to a given amount of light. Those three things can affect something. Like aperture affects depth of filed, shutter speed affects motion blur, and ISO speed affects image noise.
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