ATM stands for automated teller machine. It is an electronic telecommunications device that enables the customers to perform financial transactions, especially cash withdrawal, without any human interference such as a cashier, clerk, or bank teller. ATM is popular by different names in different countries such as cash machine, automated banking machine, cashpoint, mini bank, cashline, bankomat, and so on. In the majority of the ATMs, the customer is been identified by inserting a plastic ATM card which consists of a magnetic strip or a smart card with a chip. This chip contains unique card number and security information, which is used for the identification purpose and to avoid fraud cases. The authentication process is done by asking the customer to enter a personal identification number (PIN). Customers are able to access their bank deposit or credit accounts through which they are able to carry out a number of transactions such as cash withdrawals, credit mobile phones, check balances, and so on.