A credit card is a convenient way to obtain credit. You can decide how much credit you want to use and then decide how much you want to repay each month. It is different from a debit card in that it does not remove money from the user’s account after every transaction. In the case of credit cards, the issuer lends money to the consumer (or the user).
Though many people often mistake marketing with sales, they are in fact very different. The more theoretically based and wider scaled marketing has many differences from sales, which is more direct and persuasive. They do go hand in hand usually in making products or services a success. And both of them do involve the act of selling goods or service for money.