A credit card is a payment card issued to users (cardholders) to enable the cardholder to pay a merchant for goods and services, based on the cardholder's promise to the card issuer to pay them for the amounts so paid plus other agreed charges. The card issuer (usually a bank) creates a revolving account and grants a line of credit to the cardholder, from which the cardholder can borrow money for payment to a merchant or as a cash advance.
It is a card which allows people to buy items without cash. When they buy something, a sales clerk uses it to charge the money needed to their bank account, so the person will pay later. They are buying it on credit, which is the trust that they will pay it back later.
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Credit card Facts for Kids. Kiddle Encyclopedia.