A bit more detailed then what? I don't really understand your question. Episerver Commerce is a Commerce platform on Sql Server/Microsoft platform. Amazon is a gigantic company that does a lot of things, including selling their own products and selling via their marketplace, all of which they've built themselves.

@Tom: Your question is very unclear and it would not make senses to answer, unless you add more information to it. We aim to maintain a high level of quality for both questions and answers, and your question - as it is right now - might be flagged.