What is ATM Card?

Legal Definition
An ATM card is any payment card issued by a financial institution that enables a customer to access an automated teller machine (ATM) in order to perform transactions such as deposits, cash withdrawals, obtaining account information, etc. ATM cards are known by a variety of names such as bank card, MAC (money access card), client card, key card or cash card, among others. Most payment cards, such as debit and credit cards can also function as ATM cards, although ATM-only cards are also available. Charge and proprietary cards cannot be used as ATM cards. The use of a credit card to withdraw cash at an ATM is treated differently to a POS transaction, usually attracting interest charges from the date of the cash withdrawal. Interbank networks allow the use of ATM cards at ATMs of private operators and financial institutions other than those of the institution that issued the cards.

ATM cards can also be used on improvised ATMs such as "mini ATMs", merchants' card terminals that deliver ATM features without any cash drawer. These terminals can also be used as cashless scrip ATMs by cashing the receipts they issue at the merchant's point of sale.

The first ATM cards were issued in 1967 by Barclays in London.
-- Wikipedia
Legal Definition
A card used to get money from an ATM. It is plastic and has a magnetic strip. It can be used as a debit card too.