T X - as - a - Service : Cloud Computing with Google App Engine , Amazon Web Services , Microsoft Azure and Force

Internet has become pervasive in our daily life and Cloud computing is an emerging paradigm where computing resources are offered over the Internet as scalable, on-demand (Web) services. A company deploying an Internet service needs to invest huge amounts of money on infrastructure needs to serve possible users which is not a problem for large enterprises but when it comes to Small and Medium Enterprises (SME) affordability becomes a huge factor with the huge infrastructure come problems like machines failure, hard drive crashes, software bugs, etc. This might be a big problem for such a community. Cloud Computing is the ultimate solution to this problem. Rather than buying, installing and operating its own systems, an organization can rely on a cloud provider to do this for them. Cloud Computing key market leaders like Google, Amazon, Microsoft and Salesforce.com introduces new operating and business models that allow customers to pay for the resources they effectively use, instead of making heavy upfront investments. The aim of this paper is to provide the concepts as well as the technology behind Cloud Computing in general and analyze most popular platforms, The Google App Engine, Amazon Web Services, Windows Azure Platform and Force.com. This paper also discussed to identify companies for their favorability in the migration to the Cloud Architecture.