On-demand self service is also related to utility computing and the pay-as-you-grow subscription method, where rather than pay for the entire production infrastructure, the user is billed only for the amount of resources used under a subscription-based billing method.
Cloud computing enables end users to provision computing power, storage, networks and software in a simple and flexible way. Most users begin by using limited resources and increase them over time. On-demand self service methodology authorises users to request resources on run time. This transition mostly takes place immediately, although it can depend on the architecture and resource availability of the cloud provider.
Its a service, provided by cloud service providers to facilitate clients with the cloud resources on demand.
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