A debit card (also known as a bank card or check card) is a plastic card which provides an alternative payment method to cash when making purchases. Functionally, it can be called an electronic check, as the funds are withdrawn directly from either the bank account (often referred to as a check card), or from the remaining balance on the card. In some cases, the cards are designed exclusively for use on the Internet, and so there is no physical card.

The use of debit cards has become widespread in many countries and has overtaken the cheque, and in some instances cash transactions by volume. Like credit cards, debit cards are used widely for telephone and Internet purchases.

Debit cards can also allow for instant withdrawal of cash, acting as the ATM card for withdrawing cash and as a cheque guarantee card. Merchants can also offer "cashback"/"cashout" facilities to customers, where a customer can withdraw cash along with their purchase.

Credit or Debit?

For consumers, the difference between a "debit card" and a "credit card" is that the debit card deducts the balance from a deposit account, like a checking account, where the credit card allows the consumer to spend money on credit to the issuing bank. In other words, a debit card uses the money you have and a credit card uses the money you don't have. "Debit cards" which are linked directly to a checking account are sometimes dual-purpose, so that they can be used as a credit card, and can be charged by merchants using the traditional credit networks. A merchant will ask for "credit or debit?" if the card is a combined credit+debit card. If the payee chooses "credit", the credit balance will be debited the amount of the purchase; if the payee chooses "debit", the bank account balance will be debited the amount of the purchase.

The "debit" networks usually require that a personal identification number be supplied. The "credit" networks typically require that purchases be made in person and often allow cards to be charged with only a signature, and/or picture ID.

Types of debit card

1. Issuing bank logo
2. EMV chip
3. Hologram
4. Card number
5. Card brand logo
6. Expiry date
7. Cardholder's name

1. Magnetic stripe
2. Signature strip
3. Card Security Code

There are currently three ways that debit card transactions are processed: online debit (also known as PIN debit), offline debit (also known as signature debit) and Electronic Purse Card.

Although many debit cards are of the Visa or MasterCard brand, there are many other types of debit card, each accepted only within a particular country or region, for example Switch (now: Maestro) and Solo in the United Kingdom, Interac in Canada, Carte Bleue in France, Laser in Ireland, "EC electronic cash" (formerly Eurocheque) in Germany and EFTPOS cards in Australia and New Zealand. The need for cross-border compatibility and the advent of the euro recently led to many of these card networks (such as Switzerland's "EC direkt", Austria's "Bankomatkasse" and Switch in the United Kingdom) being re-branded with the internationally recognised Maestro logo, which is part of the MasterCard brand. Some debit cards are dual branded with the logo of the (former) national card as well as Maestro (e.g. EC cards in Germany, Laser cards in Ireland, Switch and Solo in the UK, Pinpas cards in the Netherlands, Bancontact cards in Belgium, etc.). The use of a debit card system allows operators to package their product more effectively while monitoring customer spending. An example of one of these systems is ECS by Embed International.