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Cloud computing represents a paradigm shift, a transition from computing-as-a-product to computing-as-a-service. Instead of buying hardware and software products, which require installation, configuration, and maintenance, cloud computing lets you use applications and computing infrastructures in the cloud as a service, so you pay only for resources used. Clouds thus offer businesses and individual access to advanced IT infrastructures and applications that might otherwise be out of their reach. Emerging markets have been quick to recognize this and other benefits of cloud computing.