A debit card is linked directly to a checking account. Depending on the dollar amount in your checking account will determine some of your spending limitations. Signing up for eBanking or mobile banking at your financial institution can help you keep track of your spending and balance. You can run a transaction as Debit, using your confidential 4-digit PIN, or Credit, signing your name. A debit card does not help build your credit. A Credit Card is when you borrow money from a line of credit and then pay it back on a monthly basis. If the balance is not paid back monthly, you will acquire an additional interest fee. Your spending limitations are determined by your credit card limit. Your credit card limit is the maximum you can charge to your credit card. A credit card can help you build your credit.