The public cloud model is the most recognizable cloud model, as well as the fastest growing. The most prominent examples of cloud computing tend to fall into the public cloud model because they are, by definition, publicly available.
Due to the scalability and cost, public cloud is used extensively for applications that don’t require the level of infrastructure and security offered by private cloud. Enterprise clients can utilize public cloud infrastructure to gain operational efficiencies, for example, with the storage of non-sensitive content and online document collaboration.
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Some of the features of public cloud:
Ultimate scalability – vast on demand resources are available so that applications can respond seamlessly to fluctuations in activity.
Cost effective - public cloud brings together a greater level of resources so users can benefit from the largest economies of scale. The centralized operation and management of the underlying resources is shared across all of the subsequent services.
Utility style payment model - public cloud services employ a pay-as-you-go model whereby the consumer is able to access the resource they need, when they need them, and only pay for what they use; avoiding wasted capacity.
Reliability - the sheer number of servers and networks involved in creating a public cloud mean that if one physical component fails, the service would still run unaffected on the remaining components. In some cases, where clouds draw resource from multiple data centers, an entire data center could go offline and individual services would suffer no ill effect. There is, in other words, no single point of failure.
Flexibility - there are a myriad of IaaS, PaaS and SaaS services available on the market which follow the public cloud model and that are ready to be accessed as a service from any internet enabled device. These services can fulfill most computing requirements and can deliver their benefits to private and enterprise clients alike. Businesses can even integrate their public cloud services with private clouds, where they need to perform sensitive business functions, to create hybrid clouds.
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 remote access to IT infrastructure (in case of emergencies, etc.) and online document collaboration from multiple locations.