Both. According to the information inquiry on the official website of HSBC, the black card issued by HSBC Hong Kong can be used as both a credit card and a savings card. The card has a dual function, which can not only meet the credit consumption needs of cardholders, but also can be used as a daily savings account. Black cards usually require cardholders to have higher income and credit levels to successfully apply, and at the same time enjoy richer discounts and benefits.