"Debit" in the United States refers to chip-and-PIN transactions only (though tap-and-PIN is also now a thing). The US debit card networks process only in-person transactions because their fees are limited by law and the risk of fraud is lower for chip-and-PIN compared to the "trust me bro" of online card transactions.

All other transactions processed through the Visa or Mastercard network are treated as credit card transactions for the purposes of processing the transaction on the network, even if the underlying card is a debit card.

I'm EU based. We don't have visa debit cards