The Edge - what's the point

so as far as i know the edge move a server close as possible to your user right?
but then what's the point of the edge if the database is server located in one region which is depend one the user if the request gonna be fast or slower right?
i see the edge fit for applications where there's no database maybe? i'm new to all of these so if you can explain when should i use the edge or i'm missing something with all of that
Solution
Cold starts bad
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