It seems so simple you walk up to the machine, insert your ATM or debit card, and are then able to withdraw or deposit money, inquire on your account status, and in some cases even purchase postage or a variety of other goods or services.

Have you ever stopped to wonder exactly how it is that automatic teller machines (known as ATM's) work?

There is obviously a computer at work, and it does its job well since it's very rare that the ATM makes a mistake. To help provide some insight into the automated teller, here is an overview of exactly how the ATM does all of the things that it does.

What ATMs are

Automatic teller machines are basically computerized bank interfaces, allowing customers to access several banking features any time of the day or night regardless of whether the actual bank is open or not. While there are some features that cannot be accessed from an ATM (such as opening a new account or applying for a loan), modern ATMs strive to allow customers to have as much of the banking experience available to them as possible.

How ATMs operate

ATM operation is fairly straightforward. A computer within the machine allows users to choose from a variety of different options after they insert or swipe their ATM or debit card. The card information along with their choices are sent to a computer at the bank where the ATM is located or to the bank which controls the ATM, if the machine is a stand-alone that isn't located at a bank branch. If the individual using the machine is a customer at the bank, then the computer then accesses their account; if they are not, then the bank's computer contacts the computer at the user's home bank.

Checks are made to see whether or not the user can complete the transaction that they request, and if so then the transaction is completed. An electronic eye within the ATM counts any money that is given, making a record of the bills used and whether any of them are damaged, while a camera (and sometimes a microphone) record the user in case there is a need to know who used the card.

ATMs and other banks

Almost all automatic teller machines allow users from other banks to make use of them, though there is generally a service charge associated with this. The options available may be limited when the user isn't a customer with the bank that controls the ATM; they may not be able to make certain inquiries or deposits, or access certain features that the machine offers. In many cases, however, most or all of the options offered by a particular machine are available to all users, regardless of their bank of origin.

When ATMs make mistakes

It doesn't happen often, but occasionally ATM machines do make mistakes. This is usually due to some glitch in the software, or by bills that are loaded incorrectly or that are sticking to each other and causing a jam or blockage. If this happens to you, report the problem to the bank that controls the ATM as soon as possible. They will check the internal records of the machine, and work to get the problem resolved as quickly as possible.

In most cases, checking the records will not only reveal the source of your problem so that it can be corrected but will also help them to fix the problem so that it doesn't happen to others.

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