The digital sensor in your phone or camera is made from millions of small photosites. Each photosite corresponds to one pixel in the final image. When light hits a photosite, it creates an electric charge. The more light that hits the photosite, the stronger the charge created, and the brighter the pixel in the final image.
from How-To Geek https://www.howtogeek.com/368550/what-is-noise-reduction-in-digital-images/
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