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Everybody is sure that cloud computing is key to the future of IT, but people often seem unsure quite what it is. In fact, its an umbrella term for a number of different trends, all involving the internet and its potential to simplify the way we use computers and extend their capabilities.
The cloud is the internet, and the term is fitting its large, out there somewhere, and fuzzy at the edges. Cloud computing is about putting more of your material "out there" and less on PCs or servers that a business runs for itself.
You can do this in many ways, but with every vendor claiming to do cloud computing in some form it has become confusing. It is worth understanding terms such as SaaS (software-as-a- service) and PaaS (platform-as a-service) so as to evaluate vendor claims. There are radical differences between the various forms of cloud computing, and they do not all offer the same benefits.
Whats the point of cloud computing Reasons vary, but often include the desire to outsource the maintenance burden of servers and applications; the need to scale systems up or down on demand; the benefit of being able to access your data from anywhere with an internet connection; and the ability to replace occasional heavy expenditure on IT with regular and predictable operational expenditure.
What is software-as-a-service (SaaS) Pre-baked services that you access simply by navigating there in a web browser.
Google Mail and Google Docs are examples of this kind of cloud computing.
What is platform-as-a-service (PaaS) A set of lower-level services such as an operating system or computer language interpreter or web server offered by a cloud provider, on which developers can build custom applications. Microsoft Windows Azure and Google App Engine are examples of PaaS
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