Secret Code Petshop Why Do Credit Cards Not Require A Secret 4 Digit Code?

Why do Credit Cards not require a secret 4 digit code? - secret code petshop

Debit cards. Would it solve many problems of fraud. as if you are to your credit card to the waiter, and he wrote / IT shops / take a photo of complement on the phone .. or something like that, it can be purchases online.

Why are there at least the option of having your credit card to a secret 4-digit code, debit cards.