Credit card cashback refers to the reward given by the merchant bank to its customers by way of cash back. Many banks give reward points as an encouragement to use their cards. These reward points can be redeemed after they reach a significant amount. In a similar fashion, banks have started giving cash back as a way of rewarding loyal customers. You need to find the best credit card that offers you the best rate of interest on your cash back.
Some banks give higher cash back if you spend at a particular merchant. Moreover, they encourage you to spend on essentials like groceries, gas stations and other things that generally form the bulk of your expenses each month.