An ATM or Automated Teller Machine is an machine that gives you money if you put in a card.
Not any card, but a special card that is given by the bank when you open an account.
You will need to have money in the bank account for you to be able to withdraw the money. If you do not have any money in the bank account, the ATM will not give you any money.
That is why it is very important to save money for your needs and wants
Because of the ATM you do not have to go to the bank to withdraw money. There are many ATM around the city.