If you need to carry a balance on your credit card, a low interest credit card is the way to go. Do you have a big purchase on the horizon, but can't lay out all the cash at once? Spread payments over an introductory period with low or no interest and watch your savings add up.
Keep an eye on due dates, because once you make a late payment you can kiss your promotional rate goodbye. Be sure you don't miss a payment due date, so your low rate doesn't end early. Also, pay off the entire balance of the card before the introductory rate expires, and then only use the card for purchases you can pay off right away.
Banks issue credit cards with introductory APR from 0% and up to about 10% - sometimes for as long as 21 months, depending on the bank's individual policies. Once the 0% or low interest offer ends, you'll pay a more typical ongoing interest rate wich will be determined when your application is approved.