A credit card can be an easy way to make purchases online, in person or over the phone. When used properly, a credit card can even help you manage your cash flow. But before applying for a credit card, it’s good to know how they work. A credit card is essentially a personal line of credit which lets you buy things and pay for them later. As a card holder, you’ll be given a credit limit and (potentially) charged interest on the money the bank lends you. At the end of each billing period, the bank will send you a statement which shows your outstanding balance and the minimum amount you need to pay back. If you don’t pay back the full balance amount, the bank will begin charging you interest.