Originally Posted by Zohaib786

but it was some time also called auto teller machine.
An automated teller machine or automatic teller machine (ATM) (American, Australian, British English, Hiberno-English and Indian English), also known as an automated banking machine (ABM) in Canadian English, and a Cashpoint, cash machine or sometimes a hole in the wall in British English and Hiberno-English, is a computerised telecommunications device that provides the clients of a financial institution with access to financial transactions in a public space without the need for a cashier, human clerk or bank teller.