What is the difference between a credit card and a loan?

A personal loan and a credit card are similar in that the bank approves a certain amount for the customer, which they can spend, for example, on purchases.  

The main advantage of a credit card is the interest-free (grace) period, during which you can use the bank's money within the credit limit and pay no interest on it. For a personal loan, interest accrues from the first day the funds are used.  

Another difference is that, for a credit card, payments made restore the credit limit, and these funds become available for use again. For a personal loan, payments only reduce the amount of debt, and the loan agreement has a limited term.