Credit cards are divided into principal cards and supplementary cards. Supplementary cards refer to those held by the principal cardholder’s parents, children and spouse, and are applied for by the principal cardholder. They are the same as the principal cardholder. The main account, but the name and sub-account are the cards of the supplementary card applicant. There are also large and small cards (more merchants are involved), MSN, VISA MINI, Olympic card, car card, etc. These cards are all one big card with a small one. card or multiple small cards. Some require swiping to get the annual fee waived, while others waive it for life. It depends on the type. Some are usable in China and some are not. It also requires a detailed analysis of the specific situation. I don’t know what you are talking about. Is it this?