atm - An automated teller machine or automatic teller machine (ATM) is a computerised telecommunications device that provides a financial institution's customers a method of financial transactions in a public space without the need for a human clerk or bank teller. Security is provided by the customer entering a PIN number. Using an ATM, customers can access their bank accounts in order to make cash withdrawals (or credit card cash advances) and check their account balances. Many ATMs also allow people to deposit cash or checks, transfer money between their bank accounts, pay bills, or purchase goods and services. An ATM is also known, in English, as Automated Banking Machine source: wikepedia