Credit cards can be used as secondary cards, but savings cards can't.
Savings card is a kind of debit card, which can only deposit and withdraw money, handle transfer, remittance, pay water and electricity bills, etc. Debit cards are also called debit cards. When shopping in the mall, you can choose to pay by debit card, but it should be noted that debit cards cannot overspend or overdraw. At the same time, debit cards can also be used to withdraw money and transfer money through ATM, and the amount in the account is calculated according to the interest of demand deposits.
Debit card refers to a bank card without overdraft function that can be consumed (or withdrawn) after deposit. According to their different functions, it can be divided into debit cards (including savings cards), special cards and stored-value cards. Debit card is a credit tool with the functions of transfer settlement, cash deposit and withdrawal, shopping and consumption. Debit cards cannot be overdrawn.
The transfer card has the functions of transfer, cash deposit and withdrawal and consumption. Special card is a debit card used for specific purposes (except for department stores, restaurants and entertainment industries) in a specific area, which has the functions of transferring money and depositing and withdrawing cash. Stored value card is a prepaid wallet debit card in which the bank transfers funds to the card for storage according to the cardholder's requirements, and directly deducts money from the card during the transaction.