Automatic teller machines (ATMs), also known as ATMs, mean automatic teller machines (ATMs). Because most of them are used for withdrawal, they are also known as ATMs. It is a highly precise mechatronic device, which uses magnetic code card or smart card to realize self-service of financial transactions, replacing the work of bank counter staff. Cash withdrawal, deposit balance query, fund transfer between accounts, balance query, etc; It can also carry out cash deposit (real-time entry), check deposit (not available in China), passbook re-registration, intermediate business and other work. Cardholders can use credit cards or savings cards to handle automatic withdrawal, balance inquiry, transfer, cash deposit, passbook re-registration, fund purchase, password change, mobile phone charges and other businesses according to the password.