F-stop is a little more complex… in short it's the amount of light allowed in to the film.
Specifically for the camera it's the RATIO of the aperture's Diameter to the focal length to the film surface…
f-stop = f/D
So on a camera, the increments are set at factors of two, so every click either doubles or halves the amount of light with each click, usually by adjusting the aperture.
Stops for a flash are similar in that it increases the amount of light that will reach the film, so they are also measured in stops.
Make sense?
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