Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How is Discover different from a Visa or a MasterCard?
From the business side of credit cards, Discover and American Express carry their own risk. AmEx has lent their logo to banks such as Bank of America (BofA) to use the AmEx transaction network, but the financial risk and customer service is provided by BofA. Visa and MasterCard let banks use their logo and process through their respective networks for a fee. The financial risk of fraud, non-payment from merchants, etc is the risk that the individual banks carry.