What are the APRs?

The annual percentage rate--APR--is the way of stating the interest rate you will pay if you carry over a balance, take out a cash advance, or transfer a balance from another card. The APR states the interest rate as a yearly rate.
Multiple APRsA single credit card may have several APRs:
One APR for purchases, another for cash advances, and yet another for balance transfers. The APRs for cash advances and balance transfers often are higher than the APR for purchases (for example, 14% for purchases, 18% for cash advances, and 19% for balance transfers). Tiered APRs. Different rates are applied to different levels of the outstanding balance (for example, 16% on balances of $1–$500 and 17% on balances above $500). A penalty APR. The APR may increase if you are late in making payments. For example, your card agreement may say, “If your payment arrives more than ten days late two times within a six-month period, the penalty rate will apply.” An introductory APR. A different rate will apply after the introductory rate expires. A delayed APR. A different rate will apply in the future. For example, a card may advertise that there is “no interest until next March.” Look for the APR that will be in effect after March.
If you carry over a part of your balance from month to month, even a small difference in the APR can make a big difference in how much you will pay over a year.