what is the source of bitcoin for trading site like koinexcoinbase/etc...?

what is the source of bitcoin for trading site like koinexcoinbase/etc...?

I understand sites like koinex/coinbase/etc.. credit bit coins when we try to buy bitcoins from them.

How do they (koinex/coinbase/etc..) get bitcoins to give it to users when they buy? are they doing mining and getting coins? or do they buy bitcoins from somebody who is mining ?

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