APR stands for Annual Percentage Rate and is used to express the cost of borrowing money on credit cards and loans. It reflects not only the interest rate but also any fees or additional costs involved in the borrowing process. When comparing credit card offers or loans, it’s important to look at the APR to get a full picture of how much borrowing will cost.

A lower APR means you'll pay less in interest over time, making it a key factor when deciding on a credit card or loan. Some credit cards offer introductory 0% APR promotions, but these rates eventually expire. It's important to pay close attention to both the promotional and regular APR rates.