ATM

Full form is automated teller machine.ATM's are very basic computer(or data terminal).It have 2 input devices keypad,card reader and 4 output devices cash dispenser,receipt printer,speaker and screen.
Procedure

• Firstly insert a card into the card reader.The card reader reads information encoded on the magnetic strip on back of the card.
• The card black strip is encoded with a unique card number,expiry date or CVV and a PIN.
• Response to the prompts on the screen.The ATM asks the PIN.The authentication to access account fund is provided by entering the PIN(personal identification number).
• ATM communicates with bank and within a minute we get money and a receipt from the bank account balance.