MasterCard Worldwide is a multinational corporation based in Purchase, New York, United States. Throughout the world, its principal business is to process payments between the banks of merchants and the banks of purchasers that use its "MasterCard" brand debit and credit cards to make purchases. MasterCard Worldwide has been a publicly traded company since 2006. Prior to its initial public offering, MasterCard Worldwide was a membership organization owned by the 25,000+ financial institutions that issue its card.
MasterCard, originally known as MasterCharge, was created by several California banks as a competitor to the BankAmericard issued by Bank of America, which later became the Visa credit card issued by Visa Inc.. The original banks behind MasterCharge were United California Bank (later First Interstate Bank and subsequently merged into Wells Fargo Bank), Wells Fargo, Crocker National Bank (also subsequently merged into Wells Fargo), and the Bank of California (subsequently merged into the Union Bank of California)
American Express Company credit cards, sometimes known as "AmEx", is a diversified global financial services company that is headquartered in New York City. Founded in 1850, it is one of the 30 components of the Dow Jones Industrial Average. The company is best known for its credit card, charge card, and traveler's cheque businesses. Amex cards account for approximately 24 percent of the total dollar volume of credit card transactions in the US, the highest of any card issuer.

Visa Inc.credit cards, commonly referred to as VISA (Visa International Service Association), is a multinational corporation based in San Francisco, California, USA. The company operates the world's largest retail electronic payment network, managing payments among financial institutions, merchants, consumers, businesses and government entities. Before Visa Inc's IPO in early 2008, it was operated as a cooperative of some 21,000 financial institutions that issued and marketed Visa products including credit and debit cards.
The Discover Card is a major credit card, issued primarily in the United States. It was originally introduced by Sears in 1985, and was part of Dean Witter, and then Morgan Stanley, until 2007, when Discover Financial Services became an independent company. Novus, a major processing center, used to be partners with the company as well. The Novus logo has since been retired and now the Discover Network logo has replaced it.
Capital One Financial Corp. is a U.S. based bank holding company specializing in credit cards, home loans, auto loans, banking, and savings products. A member of the Fortune 500, the company helped pioneer the mass marketing of credit cards in the early 1990s, and it is now the fourth largest customer of the United States Postal Service and has the 8th largest deposit portfolio in the United States. Capital One Credit Card
MBNA Corporation was a bank holding company and parent company of wholly owned subsidiary MBNA America Bank, N.A., headquartered in Wilmington, Delaware, prior to being acquired by Bank of America in 2005. It was the world's largest independent credit card issuer, specializing in affinity cards. MBNA Credit Cards
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