Developing film into photographs.
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Black-and-white film is made with silver halide, which is sensitive to light and goes through a chemical change when exposed to light.
Developing exposed film is two steps: making the exposed part visible (by turning the silver halide into black silver oxide), and washing away the rest of the silver halide so it doesn’t get exposed later.
After you have developed the film, you have a *photographic negative* where the dark and light parts of the picture are reversed. By projecting light through the negative onto a piece of photographic paper, you can reverse the negative into a *positive print* where the dark parts are properly dark and vice versa. Then you develop the positive print with basically the same chemical reactions as you used to develop the film.
Color film is similar but more complicated.
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