Most models of cloud computing to many consumers is the cloud model, according to which public cloud computing services are provided in a virtualization environment, built using the included material resource sharing and access via a public network such as the Internet. In a level that they can be defined in contrast with private clouds that fence round the pool area of the basic computer resources, creating a cloud computing platform separately that only a single organization have access. public clouds, however, provide services for many clients to use the shared infrastructure.The most prominent example of cloud computing tends to fall into the pattern of public cloud computing because they are, by definition, publicly. Software as a service (SaaS) services such as cloud hosting and online Office applications is probably the most familiar infrastructure, but widely popular as a service (IaaS) and platform as a service (PaaS) offerings, including cloud-based hosting and web development environment , can follow the model is good (although all can also exist within the private cloud). public cloud was widely used during the services for individuals are less likely to need the level of infrastructure and security is provided by the private cloud. However, businesses can still use public cloud to perform their activities significantly more efficient, for example, to store the sensitive content, documents and online collaboration and webmail.Public model provides the following features and benefits:ultimate scalability; cloud computing resources available on demand from a large pool of public clouds ' of resources to the applications that run on them can react constantly fluctuate in performanceCost effectiveness; public cloud brings the same level of resources and so could benefit from the largest economies of scale. The activities and management of basic resources is shared between all the cloud services after the components, such as servers, the configuration requires less bespoke. Some clauses, the mass market may even be free for customers, based on advertising for their revenue.The utility value of style; cloud services often use a public pay-as-you-go charging model under which consumers will be able to access the resources they need, when they need it, and then only pay for what they use; So to avoid wasting capacityReliability; the absolute number of servers and networks involved in the creation of a public cloud and the backup configuration means need a physical component failure, cloud services will still run are not affected on the remaining components. In some cases, when the clouds draw resources from multiple data center, an entire data center can go offline and the cloud computing services individuals will suffer no harm. That is, in other words, there is no single point of failure that would make a public cloud service vulnerabilityFlexible; There are a myriad of IaaS, PaaS and SaaS service available on the market which by the cloud computing model and is ready to be accessed as a service from any internet device allows. These services can perform most of the required calculations and can bring benefits to the individual and corporate clients alike. Even businesses can integrate the services of their public clouds to private clouds, where they have to make sensitive business functions, to create the hybrid cloudĐến từ độc lập; sự sẵn có của các dịch vụ điện toán đám mây công cộng thông qua một kết nối Internet đảm bảo rằng các dịch vụ được cung cấp bất cứ nơi nào khách hàng được đặt. Điều này cung cấp cơ hội vô giá để doanh nghiệp như truy cập từ xa vào cơ sở hạ tầng CNTT (trong trường hợp khẩn cấp vv) hoặc tài liệu cộng tác trực tuyến từ nhiều địa điểm.
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