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Public cloud


The most recognizable model of cloud computing to many consumers is the public cloud model, under which cloud services are provided in a virtualized environment, constructed using pooled shared physical resources, and accessible over a public network such as the internet. To some extent they can be defined in contrast to private clouds, which ring-fence the pool of underlying, computing resources, creating a distinct cloud platform to which only a single organization has access. Public clouds, however, provide services to multiple clients using the same-shared infrastructure.
The most salient examples of cloud computing tend to fall into the public cloud model because they are, by definition, publicly available. Software as a Service (SaaS) offerings such as cloud storage and online office applications are perhaps the most familiar, but widely available Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) offerings, including cloud based web hosting and development environments, can follow the model as well (although all can also exist within private clouds). Public clouds are used extensively in offerings for private individuals who are less likely to need the level of infrastructure and security offered by private clouds.

The public model offers the following features and benefits:

Ultimate 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
Public clouds bring together greater levels of resource and so can benefit from the largest economies of scale. The centralized operation and management of the underlying resources is shared across all of the subsequent cloud services while servers require less bespoke configuration.
Public cloud services often employ a pay-as-you-go charging model whereby the consumer will be able to access the resource they need, when they need it, and then only pay for what they use.
The sheer number of servers and networks involved in creating a public cloud and the redundancy configurations mean that if one physical component fail, the cloud service would still run unaffected on the remaining components.
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.
The availability of public cloud services through an Internet connection ensures that the services are available wherever the client is located.