What is a credit card?
Physically, a modern credit card is a rectangular piece of plastic, graphite, or a metallic alloy, that identifies a financial account. All contain a magnetic strip on the back, and some contain an RFID chip. An account number and the owner’s name or business name may be imprinted on the front.
Behind the scenes, the credit card represents a type of financial account. By using credit cards, customers can offers a bank’s money instead of their own to pay for a product or service today, and over time, they repay the bank. For the benefit of using someone else’s money, customers will often need to pay interest, as expected with other types of loans.
This is where problems can arise.
Using other people’s money is often preferable than using your own because it lets you keep your own money available for other purposes, but if you buy something with someone else’s money while not being able to repay that type of loan, the results can destroy your own financial future.
Credit cards are like DVRs for money.
Digital video recorders allow users to “time-shift.” Television channels, at least for now, have regular schedules during which they air programs, but if you’re not free at 8:00 PM to watch The Big Bang Theory, your DVR allows you to watch the program from the beginning at your convenience.
When this is the philosophy behind the use of credit cards, users avoid financial problems. Source