What is the difference between Master Card, Visa or American Express

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What are master card, visa or American express? What are the difference between them? Which one is trusted the most? Is there service fast? Are all of them capable for international transactions? I mean this questions pops out in my head when I see master card, visa cards or even American express. I am really new to cards and banking. I don't even know if it was right to get a visa card rather than master card. And why does master card have a cirrus logo it looks the same? Confuse