Why using admin.py in apps?

Hi,

My question seem dumb, but what is the purpose of repeating the admin.py in the apps? 

as i understand, if i want to have a good practice, i separate my application on mini apps so i can re-use them, and one of the apps that is always used, are Logins (Registrations), so, why i have to repeat the admin.py for every app, since the admin.py is related for the big project (startproject), and not for the small application (startapp) (login here) ?!

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