Other forms: debit cards
A debit card is a rectangular piece of plastic you get from the bank and use to pay for things. As long as there's money in your account, all you need to pay for lunch is your debit card.
Most debit cards look just like credit cards. Both are hard plastic, printed with numbers, and can be swiped or inserted in a card reader to make purchases. The difference is that a debit card is directly connected to your bank account; the money you have in the bank is the amount that's available to you on the card. You can also use a debit card at a bank machine to make a cash withdrawal. Debit means "amount owed."