A debit card is called that because the money is debited from a demand deposit account (your checking) as opposed to a credit card transaction that is deducted the the available credit you have on your line of credit. When the clerk at the store asks you debit or credit, they are really only asking if you want to enter a PIN or if you want to sign the sales slip. Any time you use the card as a "credit" transaction you receive the same protection as you would on a regular credit card. If the card is stolen and used, you, the consumer, can get the money back in you account. You still will need to go through the written dispute process, which most banks give you a fax number to use and also will give you a provisional credit to give you the money back sooner (while waiting the outcome of your dispute). REG E (law) states the bank has a certain amount of time (30 days if memery serves correctly) to credit your account, but most banks get the money back to you much sooner. Any time you are afraid you card has been lost or stolen, please report it as soon as possible. If you report it with in 48 hours of you determining that it is missing you are not responsible for any fraudulant transaction. If you do not report it, then you can be held liable for transactions (again if memory is working tonight, it is $500.) Also, another tidbit of info is that the VISA regulations banks follow are much more consumer friendly then the laws are and that is a good thing.