a credit card will have an interest-free period, and if it is repaid before the repayment date, it will not generate interest. If it is repaid in installments on time, it will also charge a handling fee, but if it is overdue, it will generate interest (and it is still a high interest). \xd\ The way for banks to collect overdue interest on credit cards is to calculate the total amount of bills in the current month, which is called "full interest", instead of calculating the amount of the outstanding part. Full interest, also known as full penalty interest, means that if you fail to repay in full by the latest repayment date, even if you are a penny short, you will calculate the full amount of the current bill at five ten thousandths of daily interest, and compound interest will be calculated on a monthly basis, which can also be called "rolling interest". \ xd \: \ xd \ CreditCard is a non-cash transaction payment method, and it is a micro-credit payment tool provided by banks to users. The earliest credit card appeared at the end of 19th century. \xd\ Credit cards are divided into credit cards and quasi-credit cards, which provide settlement services, facilitate shopping and consumption, and enhance the sense of security; Simplify collection procedures and save social labor; Promote commodity sales and stimulate social demand. Credit card is a special card issued by banks or other financial institutions to those with good credit standing, which is used for shopping and spending in designated businesses or depositing and withdrawing cash in designated banking institutions. It is a special credit certificate.