ATM stands for Automated Teller Machine. It’s an electronic banking terminal that lets you withdraw cash, deposit checks, check your balance, and handle other basic transactions without walking into a bank or speaking to a teller. There are millions of ATMs installed worldwide, and most operate 24 hours a day.
What an ATM Actually Does
The core function of an ATM is dispensing cash from your bank account using a debit card and a PIN. But modern machines go well beyond simple withdrawals. Most ATMs now let you deposit cash or checks, transfer money between accounts, check your balance, and in some cases pay bills directly from the machine.
When you insert or tap your card, the ATM connects to your bank’s network to verify your identity and confirm your account has sufficient funds. The entire process typically takes under a minute. If you use an ATM that belongs to a different bank or an independent operator, you’ll usually pay a surcharge fee, often $2 to $4 per transaction, on top of any fee your own bank charges for out-of-network use.
How ATMs Got Their Start
The first cash machine appeared on June 27, 1967, when a Barclays Bank branch in Enfield, north London, unveiled a device that let customers withdraw money without a teller. The technology had multiple inventors working in parallel. John Shepherd-Barron developed the machine Barclays installed, while James Goodfellow independently invented a competing automated cash machine that appeared at Westminster Bank branches roughly a month later. Goodfellow is credited with patenting the PIN-based authentication system that became the industry standard.
Early machines only dispensed fixed amounts of cash. Over the following decades, ATMs added deposit capability, screen-based menus, receipt printing, and connections to interbank networks that let customers access their accounts from virtually any machine in the world.
Cardless and Contactless ATMs
A growing number of ATMs no longer require you to insert a physical card. These cardless machines verify your identity through your smartphone instead, using one of several methods.
- NFC (tap-to-authenticate): The same near-field communication technology behind tap-to-pay at retail stores. You hold your phone or smartwatch near the ATM’s reader, and your digital wallet credentials verify who you are.
- QR codes: The ATM displays a code on its screen, and you scan it with your bank’s mobile app. This confirms you’re physically standing at the machine and authorizes the session.
- One-time verification codes: Your banking app generates or receives a temporary numeric code that you enter on the ATM’s keypad.
- Biometric verification: Some advanced ATMs can read your fingerprint or face directly. Others rely on the biometric unlock on your phone (like Face ID or a fingerprint scanner) to open your banking app, which then communicates with the machine.
To use a cardless ATM, you’ll need your debit card added to your phone’s digital wallet and your bank’s mobile app installed. Not every ATM supports cardless transactions yet, so it’s worth checking your bank’s app or website for a locator before you go. Once authenticated, you still enter your PIN and use the machine the same way you would with a physical card.
Other Meanings of ATM
Outside of banking, ATM has a few other definitions depending on the field. In telecommunications and computer networking, ATM stands for Asynchronous Transfer Mode, a high-speed networking standard that transmits data in small, fixed-size packets called cells. It was widely used in the 1990s and early 2000s for backbone internet and telecom infrastructure, though it has largely been replaced by newer technologies.
In physics, “atm” (lowercase) is the abbreviation for atmosphere, a unit of pressure. One atmosphere equals the average air pressure at sea level, roughly 14.7 pounds per square inch. You’ll see it referenced in chemistry, scuba diving depth calculations, and tire pressure specifications.
When most people search for “what does ATM stand for,” they’re asking about the banking machine. But if you encounter the abbreviation in a science textbook or a networking manual, context will tell you which meaning applies.