system
Given the following post, respond as if you're commenting on Reddit:
human
What is the difference between running my bank card as a credit vs. a debit?

For the consumer, the business, as well as the bank.
gpt
in the US, many "debit" cards have the functionality to be run over the credit card's networks.  This allows for usage in situations where a merchant does not take [traditional] debit cards

To the consumer, there is little difference.  Press credit, and you will probably have to sign for it. end of story.  Press debit, enter your pin, ask for a "cashout/cashback" if you want to, and thats it.  Either way, your money gets deducted from your account.   

On the other hand, any "rewards programs" usually require being run as "credit".   Some banks charge a large fee to the cardholder if a card is run as "debit"

For the merchant, its a story of fees.  When a customer charges as credit, the credit card networks (visa/mc/etc) will charge their normal fees for credit cards, which is usually percentage-based.   Debit transactions are usually a flat, but rather large (often in the $0.20ish range) fee  (this is one reason why cashbacks are allowed over debit)