Automated Teller Machine
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An automated teller machine (ATM) is an electronic device that allows customers of a financial institution to access their account and to perform financial transactions such as checking their account balance and withdrawing cash without the need for a bank teller. The customer is issued with a plastic card with a magnetic stripe (or a chip) that contains a card number and security information that uniquely identifies the customer. The customer inserts the card into the machine and enters the personal identification number (PIN), which must match the PIN stored in the card. There are several million ATMs in use around the world.