Cloud computing is the currently biggest technology in this environment that changes the thinking of the whole world. The main aim of the cloud computing is to provide services on line depending upon the need of the users of the cloud. Cloud uses internet to provide its services with main focus on cost reduction, hardware reduction and pay only for the services that user want to use. Virtualization play a big role in cloud computing. Virtualization is a technique like cost saving, hardware reducing and energy saving used by the cloud provider. In this paper we discussed in detail about virtualization and its different types.

Cloud computing play a big role in today business environment. It provides on-demand services. Here we provide what actually cloud computing is and it's various computing technologies and their characteristics.

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