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Can someone ELI5 what is optical density?

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I’m sorry for asking such a basic question but I just don’t get. With regards to film-screen radiography and the characteristic curve, what is meant by optical density? I’ve googled it and I’m seeing stuff about absorbance and the degree of light intensity transmitted through a medium. But I still don’t get it in the context of radiology. Excluding the toe and shoulder of the characteristic curve, OD appears to be somewhat proportional to the kerma so the more photons passing on to the film, the higher the OD. But then how is OD a measure of how “absorbent” something is? Isn’t it the exact opposite of that?

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