An ATM (Automated Teller Machine) debit card is similar in size and shape to a credit card and features an account number and magnetic stripe on one side. When swiped through a Point-of-Sale terminal, the cardholder is prompted to enter a PIN number via a PIN pad. This will create an instant debit transaction, with funds drawn from the customer’s bank account. Funds are authorized in real time, and if there are not sufficient funds in the customer’s bank account the transaction will be declined. In addition to purchases, ATM cards can also be used at ATM machines to make cash withdrawals, deposits and balance transfers, and to check account balances.