What is bank ATM?

ATM Stands for Automated Teller Machine. It is a machine that was originally created for use to dispense cash to customers and to help customers check their account balance. You will need an ATM Card to do this. But, these days ATMs offer much more facilities like:

1. Fund Transfer
2. Cash Deposit
3. Check Deposit
4. Prepaid Mobile Recharge
5. etc.

However, in writing or speaking, it should only be ATM (not "bank ATM" or "ATM bank". ATM is explicit in its meaning.