Annual percentage rate (APR) is a standardized measure used to express the total cost of borrowing money over the course of one year. It is expressed as a percentage and takes into account not only the interest rate charged on a loan or credit card, but also any fees, points, or other charges that may be associated with the loan. It’s important to note that the APR may not always be the same as the interest rate advertised by the lender, as it takes into account other costs and fees associated with the loan.