Why are debit cards called debit cards?

in the language of bank and other financial institutions debit means withdrawl. so by naming debit card as debit card bank says '' it is a card by using which u can do any purchases and in return we will debit ur bank balance by that amount. so in debit card u are not borrowing cash from bank (as u do in credit card), but u are using your own money which u have earlier deposited in bank.

so in short: debit card is a card by using which u are debiting ur bank's credit balance.