ATM machines, or Automated Teller Machines, are electronic devices that allow people to access their bank accounts and perform various financial transactions. Users can withdraw cash, check their account balances, and deposit money without needing to visit a bank branch. These machines are typically found in public places like shopping centers, airports, and convenience stores. To use an ATM, a person inserts their bank card and enters a personal identification number (PIN) for security. This technology provides convenience and accessibility for managing finances anytime and anywhere.