[racket] module system overview

Hello,

Does anyone know of a good overview of the module system,
I found a reference page that shows the module form, but,
is there anything out there that explains the rationale and problems
that it is trying to solve -

or, does anyone have any ideas on where I could start in terms of reading
material?

Thanks,

-- 
C-x C-s, C-x C-c
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