Final answer:
The source of funds for transactions completed with debit cards is the holder's bank account.
Step-by-step explanation:
A debit card is a card that allows the holder to transfer money electronically when making a purchase for a good or service.
The source of funds for transactions completed with debit cards is the holder's bank account.
When a purchase is made using a debit card, the money is transferred directly and immediately from the bank account to the seller.