Bitcoin ATM machines are the same as the ATM machines we usually use for bank transactions. Connected to our wallets, we need to use cash to purchase cryptocurrency on the machine.
Bitcoin atm is similar to bank ATM but they are not the same because you can not withdraw bitcoin from bank atm, but there are some bitcoin ATMs that you can withdraw money, I mean cash. Bitcoin atms are also not connected to our wallet, it can only be used to deposit bitcoin to an address if pay cash to the bitcoin, it can also be used to withdraw cash if you pay bitcoin.