Annual interest rate refers to the deposit 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. Annual interest rate is expressed as a percentage of the principal, monthly interest rate is expressed as per thousand, and daily interest rate is expressed as per ten thousand.