I didn't see anything on here so I figured the community would benefit as well, plus I really am curious.
Lots of exchanges (or online wallets) have no fees when transferring BTC or ETH or etc between to accounts, for example sending 1 Ethereum from your Coinbase account to your friend's Coinbase account is free (or at least was I don't know about nowadays cause everything is getting to be expensive)
My question is, do these exchanges or etc actually do a transaction and have to pay fees, and just not charge us for inter-exchange transfers?
They don't have to pay because they have a certain type of wallet or etc where 1 huge wallet has sub-wallets and doesn't require a fee to transfer between them?
I just don't know how it would work and am curious of what is going on with that?
If there is a way, how could I create multiple wallets that wouldn't need to pay fees for every transfer between them? I feel like it's the opposite of a Multi-sig wallet. I don't know how this would work even still, because you can do an internal transaction of 0 Eth but still have to pay a mining fee.