Every time you go to purchase something the cashier may ask you if you are using credit or debit. Depending on what you use, will determine how your transaction is processed. Debit cards are very much similar to credit cards. Many people use their credit cards on very large purchases, and their debit card on smaller purchases. The difference is, 
everything that gets put on your credit card, has to be paid back. When you pay for items with your debit card, you do not have to pay anything back. That money is automatically deducted from your checking account.
When you use your debit card, you have the choice to decide if you want it to go through as a credit, or regular debit. If you choose for it to go through as a debit, it will make it an online transaction. If you choose credit, it will make your purchase an offline transaction.
When you pay for items with your credit card, you do not have those options. You do need to make sure that you have enough money on the card to cover the purchase, and that you will be able to pay that money back. You do not want to go over the limit, because you will then be faced with some outrageous fees, that will affect your credit.
Paying with your debit card, makes your transactions go smoother. All you have to worry about is having enough money in your account to cover your costs. If you overdraft, you will be stuck with a fee, depending on your bank. There are certain cards that don’t charge overdraft fees, but according to CC Expert Douglas Adams, these “cheaper” cards often compensate that elsewhere.
When it all is said and done, you have to distinguish what is best for you. It all just depends on your financial situation. Some people only use their credit cards for emergency purchases. They usually stick to using their debit card more often instead. That decision is totally up to you.