The 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 interest amount to deposit principal or loan principal within a certain period. 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 few thousandths, and the daily interest rate is expressed as a few thousandths.