A credit card gives you access to a line of revolving credit. When you get a credit card, you’ll be given a credit limit (maximum spend). You can spend up to this amount on your credit card.
You’ll need to make at least the minimum monthly repayment on your credit card each month, or pay the balance off in full. If you don’t pay the balance off in full each month, you’ll be charged interest on your remaining balance. If you do clear your entire balance on or before your repayment date, you won’t be charged interest on your spending.