Credit Cards - Credit cards is a form of unsecured credit (meaning a loan without collateral) that you can use to make everyday purchases. All credit card purchases are made using a loan – you borrow money from your credit card issuer, and later pay it back with interest. Read this article for information about the differences between credit and debit cards, the types of credit balance, how finance charges and interest rates work with credit cards and gives details about the CARD Act of 2009.