Electronic Credit card
At a Point of Sale terminal, after the card has been swiped, the software interprets the binary digit data contained on the magnetic stripe and contacts an acquiring bank or company that will respond if they will guarantee a payment from the swiped card.
Acquirers make money from interest charges made on their card or from transaction fees coming from merchants. For more on the origins of the credit card go here.
Visa Inc.. ( NYSE: V) United States
Mastercard. (NYSE: MC) United States
American Express. (NYSE: AXP) United States
Discover Financial (NYSE: DFS) United States