An automated teller machine or automatic teller machine[1][2][3] (ATM, American, Australian, Singaporean, Indian, Maldivian, Hiberno and Sri Lankan English), also known as an automated banking machine (ABM, Canadian English), cash machine, cashpoint, cashline, or colloquially hole in the wall (British and South African English), is an electronic telecommunications device that enables the customers of a financial institution to perform financial transactions, particularly cash withdrawal, without the need for a human cashier, clerk or bank teller.
On
most modern ATMs, the customer is identified by inserting a plastic ATM card
with a magnetic stripe or a plastic smart card
with a chip that contains a unique card number and some
security information such as an expiration date or CVVC (CVV). Authentication is provided by the
customer entering a personal
identification number (PIN).