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Visa and Mastercard are two major vendors of debit/credit cards. Other vendors are maestro, American Express etc. The usage is more or less similar at the PoS. A PoS needs to have access to both Visa and Master Card vendors to be able to accept both these cards.
* as a consumer no different both you can use in any POS machine or ATM machine.
* as a a company the different between the visa & mastercard is the bank commission rate.