Grace Period
The time period, usually between 20 and 30 days, during which you can pay off your credit-card charges without any additional finance charge. Keep in mind that not all credit cards offer a grace period. And, the grace period usually only applies when you pay off your balance in full every month. If you carry a balance forward, you'll still be subject to a finance charge. Also, the grace period usually does not apply to cash advances, which may begin to accrue interest immediately.

Go-to rate
After an introductory rate period ends, a long-term interest rate, called the "go-to rate" will take effect. Necessarily higher than the introductory rate, the go-to rate may be fixed or variable, and may apply to purchases and/or balance transfers.