What is a debit card, and how do you use it?

Question

I also want to know how to use it online.

Answer 1

 A debit card looks like a credit card but works like an electronic check. Why? Because the payment is deducted directly from a checking or savings account. If you use a debit card at a retail store, you or the cashier can run your card through a scanner that enables your financial institution to verify electronically that the funds are available and approve the transaction. Most debit cards also can be used to withdraw cash at ATMs
Get more info: debitcard.com.au