Well I did move away a while ago. Those credit cards, are they actually credit cards, as in they grant you credit that you pay off later? Because I remember a f

Well I did move away a while ago. Those credit cards, are they actually credit cards, as in they grant you credit that you pay off later? Because I remember a friend visiting me, and his "credit card" was actually a debit card, just using the Visa/Mastercard/whatever system. He did not know the difference until I explained it to him ("why did you think it's called a 'credit card'"...)