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Cloud computing is the shared pool of resources, which can be requested on-demand to enjoy the services and application. The data owner remotely store their data services and application which can be retrieved when required. The clients save their data on the storage services and gets free from the burden of maintaining the data. But some of the incidences in the history of cloud computing shows that they are not reliable at times, ex: Gmail disaster, Amazon S3 downfall. Some of the major challenging issues of the cloud computing are availability of service, data lock in, data confidentiality and auditability, data transfer bottleneck etc.
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