Developments in service oriented architecture (SOA) have taken us near to the once fictional dream of forming and running an online business, such commercial activity in which most or all of its commercial roles are outsourced to online services. The novel concept of cloud computing gives a understanding of SOA in which Information Technology assets are provided as services that are extra flexible, inexpensive and striking to commercial activities. In this paper, we concisely study developments in concept of cloud computing, and debate the advantages of using cloud services for commercial activities and trade-offs that they have to consider. Further we presented a layered architecture for online business, and then we presented a conceptual architecture for complete online business working atmosphere. Moreover, we discuss the prospects and research experiments that are ahead of us in realizing the technical components of this conceptual architecture. We conclude by giving the outlook and impact of cloud services on both large and small businesses.
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