Because, in the magnetic stripe of the credit card, personal information will be retained. If such a credit card is not cancelled, it is likely to reveal personal information, and the cancelled credit card or the credit card still in use will be stolen by others.

Two things must be done before cancellation. The first is to ensure that credit cards have no arrears and overpayments. If there is any arrears, all the arrears can be returned. If there is overpayment, it can be withdrawn by cash withdrawal or credit card.

Secondly, use up the points in the credit card to avoid wasting the accumulated points. You can exchange points for gifts in the credit card mall or give them to others.

Extended data:

When closing the account, you should bring your valid ID card and the original card. If it's not convenient for me to close the account, someone else can help you. The agent must hold the power of attorney written by the principal (himself) and bring the original valid identity certificate to handle the account cancellation business.

If the card has not expired when the credit card is cancelled, some banks stipulate that it is necessary to go to the designated outlets to handle the card collection business, and then go through the formal cancellation procedures after a certain period of time (up to 30 days). This is mainly because if the cardholder has done a manual card pressing transaction before closing the account, the cardholder will have closed the account before the merchant submits the card pressing form to the bank for entry.

Baidu encyclopedia-account cancellation