What Is Cloud Computing?
The growing interest in cloud computing has led to efforts by vendors, analysts, and government agencies to try to agree on a single definition of cloud computing, as a means to provide a common ground for discussing how best to leverage this new paradigm. For purposes of this book, the term cloud computing refers to a style of computing where dynamically and massively scalable—and often virtualized—resources are provided as a service over the Internet. The services can be of any type or complexity. They can range from complete applications that are available as a service on a subscription basis, such as applications for customer relationship management (CRM), HR, billing and invoicing, document management, accounting, ...

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