An ATM, or Automated Teller Machine, is a device that allows people to access their bank accounts and perform various financial transactions without needing a bank teller. Users can withdraw cash, deposit money, check their account balances, and transfer funds between accounts. ATMs are typically found in convenient locations like banks, shopping centers, and airports. To use an ATM, a person inserts their bank card and enters a personal identification number (PIN) for security. The machine then connects to the bank's network to process the transaction. ATMs have become an essential part of modern banking, providing quick and easy access to cash and account services.