The most recognisable model of cloud computing to many consumers is the public cloud model, under which cloud services are provided in a virtualised environment, constructed using pooled shared physical resources, and accessible over a public network such as the internet.
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.
Public clouds bring together greater levels of resource and so can benefit from the largest economies of scale.
UTILITY STYLE COSTING
Public cloud services often employ a pay-as-you-go charging model, whereby the consumer will be able to access the resource they need.
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.
The availability of public cloud services through an internet connection ensures that the services are available wherever the client is located.
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 device.