You don't have a MasterCard in your wallet? Well, I don't either so both of us must be outcasts in a world where plastics can buy stuff from stores and even online. Or perhaps you are in witness protection? Doesn't matter. MasterCard is one of the most popular credit or debit cards around and many banks issue them as well. If you are travelling, this card is your best friend since it is accepted nearly everywhere, even in Afghanistan. And best of all, for credit cards you don't have to pay in advance - so it is an American's web dream. How it works? Well, you give your card to the merchant, they authenticate it with their service provider and you get your goods. No need to pay cash anymore. Of course, you will need to pay them back later. And if you can't afford to pay them back, they take your furniture, your car, your home and your dignity. Welcome to the world of debt.