Automated teller machine or ATM also known as cash machine gives you money whenever you need. You just insert a plastic card, enter a pin number and the machine delivers the exact amount you asked for. But what goes inside the machine? Cash machine connects to a central data processor where your account details are kept. The connection to central processor may be via leased line or may be via telephone network. This Science Channel video will show you how money is kept safe and counting goes on inside the machine.
