Cloud computing is an overall philosophy and design concept. In the basic concept of cloud computing, you’re trying to separate the applications from the operating system, from the hardware. Cloud computing typically uses the Internet to access the programs which reside on hardware physically located at another location. As cloud computing resources continue to expand and prices continue to fall, many business are utilizing cloud computing in some capacity.
Public clouds are typically a set of computers or servers on a network in which a service provider makes resources such as applications and storage available to the public over the Internet. Most public cloud offerings use the same hardware to host multiple customers. Public clouds typically offers a pay-per-usage model. Amazon, Google and Microsoft are examples of organizations that offer use of their IT infrastructure to its customers for cloud computing.
A private cloud exhibits the key characteristics of a public cloud, including elasticity, scalability and self-service provisioning. The major difference is control over the environment. In a private cloud, you (or a trusted partner) control the service management. A private cloud can be a highly virtualized cloud data center located inside your company’s firewall, or a private space dedicated to your company within a cloud vendor’s data center designed to handle your company’s workloads and storage demands.
A hybrid loud approach combines a public cloud and a private cloud structure to perform distinct functions within the same organization.
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