all belong to bank cards.

if there is money in the savings card, it is your own money. If you save it first and then use it, including withdrawing money and spending it by credit card, you will use your own money.

if there is a credit card line, it is a pre-used line given by the bank. First, swipe the card to spend or withdraw money, and then return it to the bank at the agreed time.

a Bank Card is a credit payment tool issued to the society by financial institutions such as commercial banks and postal savings and exchange institutions, which has all or part of the functions of consumer credit, transfer settlement, cash deposit and withdrawal, etc. Bank cards include credit cards and debit cards. Because all kinds of bank cards are made of plastic, they are also used for deposit and withdrawal and transfer payment, so they are also called "plastic money".

the size of a bank card is generally 85.6×53.98mm(3.37×2.125 inches). There are also mini cards and irregular cards that are 43% smaller than ordinary cards.

By the end of 216, China had issued a total of 6.37 billion bank cards, and the population of China was close to 1.4 billion. On average, each person held nearly five bank cards, while the cumulative number of live cards was only 4.18 billion, and the number of "sleeping cards" was 2.19 billion, accounting for 1/3. In other words, each person holds an average of nearly two "sleeping cards". Since 217, banks have continuously increased the management of sleeping cards, and some "double zero cards" will be frozen from November.