Cloud computing is a hot topic in recent years. It exhibits the following key characteristics: agility, low cost in using, device and location independence, virtualization, reliability, scalability and elasticity, performance and etc. All those features show fascinating benefit to companies. As they can get free from the worry about the investment on hardware and can setup up their business easily. There are three major types of cloud services delivery model: Infrastructure as Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). Different type of delivery model provides different convenience. IaaS just likes server-hosting services, but consumers do not need pay for hardware and maintain them anymore. They benefit much from the scalability and elasticity. PaaS is like service-hosting, but consumers do not need to worry about the servers out of working or not able to response to large number of requests. They benefit much from the performance and reliability. SaaS looks like the Representational State Transfer (REST) very much, and makes consumers benefit from performance, multi-tenancy architecture and many other features. In this era of globalization, concentrating is the only way to success for the small companies or those just on their beginning, especially for those information technology (IT) companies. At this situation, outsourcing is a perfect way to survival, as they can more concentrate on the core business. They can outsource the noncritical software or modules to other companies to reduce the risk and human resources. The next one to be outsourced should be the services or the hardware for computing and storage. And to my opinion, this is just the original driver to the popular of the cloud computing. Cloud computing is a virtual computing environment which can provide applications, platform and software support as remote services. And those services can be accessed by Internet all over the world.
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