“Cloud”is a common metaphor for an Internet accessible infrastructure(e.g.data storage and computing hardware)which is hidden from users.Cloud Computing makes data truly mobile and a user can simply access a chosen cloud with any internet accessible device.In Cloud Computing,IT-related capabilities are provided as services,accessible without requiring detailed knowledge of the underlying technology.Thus,many mature technologies are used as components in Cloud “Cloud” is a common metaphor for an Internet accessible infrastructure. (Egdata storage and computing hardware) which is hidden from users. Cloud Computing makes data truly mobile and a user can simply access a chosen cloud with any internet accessible device. Cloud Computing, IT-related capabilities are provided as services, accessible without requiring knowledge of the underlying technology. Thus, many mature technologies are used as components in Cloud