The annual interest rate refers to the deposit interest rate for one year. The so-called interest rate, abbreviated as "interest rate," is the ratio of the interest amount to the principal of a deposit or loan within a certain period. It is usually divided into three types: annual interest rate, monthly interest rate, and daily interest rate. The annual interest rate is expressed as a percentage of the principal, the monthly interest rate in thousands of a percent, and the daily interest rate in ten thousandths of a percent.