Visa Debit card is a debit product, so why should I press CREDIT at the terminal instead of DEBIT?
When you press CREDIT and sign for a purchase, your transaction is routed through the Visa network. This gives you all the security protections of a Visa transaction. But your Visa Debit card still works like a debit card, not a credit card: The purchase amount is deducted from your checking account and you don’t pay interest. See the complete list of security protections.