How do thieves use stolen credit cards when they dont know the pin number?

Question

I dont understand, people lose their credit card and say it has been used in places such as walmart or the gas station. How do they use it if they do not know the pink number? Do they guess until they get it right? someone says they just sign it no pin # needed when i always see my parents punching in 4 digits or something when they slide it at like a market or a clothing store.

Answer 1

They just use a fraudulent signature instead of a pin number. Pin numbers are used with debit cards.