Credit card can be useful, not only one can claim discounts while using them, but also one can go cashless if he has a credit card. In cities most shopkeepers accept credit cards which is helpful as it reduces the risk to carry cash. Also a impulsive buyer may buy a product if he likes it even if he is not carrying any cash. But, the central point is the high interest rates, every person carrying a credit card should remember that they have very high interest rates and are to used judiciously. Don't get carried away especially when you are trying to impress girls. Don't get into the vicious cycle of Late payments and penalties either. Use your credit cards wisely.