Credit Card Debit Card Difference Difference Between Credit Card And Debit Card In USA?

Difference between credit card and debit card in USA? - credit card debit card difference

I moved to the United States and life is a bit strange. If I pay with my U.S. visa, sometimes I ask myself: "Credit?" No one could me a straight, single-English explanation of why I should choose one or the other. And anyway, what's the point with these two alternatives?

Thank you.