APR stands for Annual Percentage Rate, and it's the cost of borrowing money expressed as a yearly percentage. When you take out a loan, use a credit card, or get a mortgage, the lender charges you interest. APR tells you what that interest actually costs over a full year—and it includes fees the lender adds on top of the basic interest rate. Understanding APR matters because two loans with the same interest rate can have different APRs, and a lower APR saves you real money.

The articles here explain how APR works, why it differs from the interest rate alone, and how to compare APRs across different types of borrowing. You'll learn what APR means on credit cards versus personal loans, how it affects your monthly payment, and what to watch for when you're comparing offers from different lenders.