automated teller machine: a machine, usually in a wall outside a bank, shop, etc. from which you can take money out of your bank account using a special card:
Is there an ATM near here? I need to get some money out.
I needed some cash, so I went to the ATM at the local bank to withdraw money from my account.
The ATM was out of service, so I had to visit a different one to deposit a check into my account.
With the convenience of ATMs, I can check my account balance and make deposits without visiting a physical bank branch.