What are the essential characterstics of cloud computing

what are the essential characteristics of cloud  computing?

ANS:- According to NIST ( National institute of standards and technology)  there are five essential characteristics of cloud computing:-

On Demand Self Service:-Computer services such as email, applications network or server service can be provided without requiring  interaction with each service provider. Cloud service providers providing on demand self services include Amazon Web Service , Microsoft, IBM and salesforce.com.

Broad Network Access:-Cloud capabilities are available over the network and accessed through standard mechanism that promote use by heterogeneous clients such as mobile phones, laptops.

Resource pooling:-The resources pooling are pooled together to serve multiple customers, with different physical and virtual resources dynamically assigned and reassigned according to the customers demand. Examples of resources include storage, processing, memory, and network bandwidth.

Rapid elasticity:-Capabilities can be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand.

Measured service:-Cloud systems automatically control and optimize resource the type of service (e.g. storage, processing, bandwidth, and active user accounts). Resource usage can be monitored, controlled, and reported, providing transparency for both the provider and consumer of the utilized service.

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