Credit card is a bank card that offers instant credit to the card holder. When you use a credit card to pay for goods, you are actually borrowing money from the bank which issued the card. Instead of deducting the amount of each purchase from your account at the time of purchase (as happens with ATM and debit cards), the bank will pay the vendors and send you a credit card bill every month showing all of the purchases you made with the credit card. If you do not pay this bill within 30 days, the credit card company will begin charging you interest on the unpaid balance.
Credit cards are a useful form of short-term finance that can be used for purchases. They can provide a useful means of finance for everyday purchases but if they are not paid on time and in full, using them can quickly result in the user getting into debt. It is very important when using credit cards to only spend what you know you can quickly repay.
Store cards are available in many countries. They may not be described as such, but store cards are effectively credit cards that can only be used in one store (or network of stores).