The credit card is entitling its holder to buy goods and services based on the holder's promise to pay later. The issuer of the card grants a line of credit to the consumer from which the user can borrow money for payment to a merchant or as a cash advance to the user.

The debit card provides an alternative payment method to cash when making purchases. Functionally is an electronic cheque, as the funds are withdrawn directly from either the bank account, or from the remaining balance on the card.

Like credit cards, debit cards are used widely for telephone and Internet purchases, and unlike credit cards the funds are transferred from the bearer's bank account instead of having the bearer to pay back on a later date.

Debit cards can also allow for instant withdrawal of cash, acting as the ATM card for withdrawing cash and as a cheque guarantee card. Merchants can also offer cashout, where a customer can withdraw cash along with the purchase.

The dual cards offer both the debit and the credit purchasing options with the same card.

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