Annual interest rate refers to the deposit interest rate for one year. The so-called interest rate is the abbreviation of "interest rate", which refers to the ratio of the interest amount to the deposit principal or loan principal 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 is expressed as a thousandth, and the daily interest rate is expressed as a ten-thousandth.