The public model offers the following features and benefits:

Scalability; cloud resources are available on demand from the public clouds’ vast pools of resource so that the applications that run on them can respond seamlessly to fluctuations in activity.

Cost effective; public clouds bring together greater levels of resource and so benefit from the largest economies of scale. The centralised operation and management of the underlying resources is shared across all of the subsequent cloud services whilst components, such as servers, require less bespoke configuration.

Utility style costing; public cloud services often employ a pay-as-you-go charging model, allowing access of resources when required and only pay for what is used.

Reliability; the sheer number of servers and networks involved in creating a public cloud and the redundancy configurations means that should one physical component fail, the cloud service would still run unaffected on the remaining components. In some cases, where clouds draw resources from multiple data centres, an entire data centre could go offline and individual cloud services would suffer no ill effect. There is, in other words, no single point of failure, which would make a public cloud service vulnerable.

Location independence; the availability of public cloud services through an internet connection ensures that the services are available wherever the client is located. This provides invaluable opportunities for enterprise such as remote access to IT infrastructure, or online document collaboration from multiple locations.

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