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A credit card is a system of payment named after the small palstic card issued to users of the system. A credit card is different to a debit vards in that it does not remove money from the user's account after every transaction. In the case of credit cards, the issuer lends money to the consumer (or the user) to be paid to the merchant. It is also different from a charge cardsto be paid in full each month. In contrast, a credit card allows the consumer to 'revolve' their balance, at the cost of having interest charged. Most credit cards are the same shape and size, as specified by the ISO 7810 standard. The most common credit card size, known as ID-1, is 85.60 × 53.98 mm

On November 8, 2004, MasterCard and Diner's Club formed an alliance. Cards issued in Canada and the USA start with 55 and are treated as MasterCards worldwide. International cards use the 36 prefix and are treated as MasterCards in Canada and the US, but are treated as Diner's Club cards elsewhere. Diner's Club International's website makes no reference to old 38 prefix numbers, and they can be presumed reissued under the 55 or 36 BIN prefix.
Effective October 1, 2006, Discover will now be using the entire 65 prefix, not just 650. Also, similar to the MasterCard/Diner's agreement, China Union Pay cards are now treated as Discover cards and accepted on the Discover network.
A search on VISA's website results in many references to card numbers being 16 digits long. However, searching for references to 13-digit cards will turn up no results. It might be presumed that 13-digit cards no longer exist and have been reissued as 16-digit cards, however old accounts may still use these numbers.
Switch will continue to exist until mid 2007, after that it will branded as Maestro. Maestro is now VISA Electron's main competitor in the European debit card market