About Cloud Computering- Definition
In "Smart Earth" -- IBM Cloud Computing 2.0, IBM explains the concept of cloud computing as follows: "Cloud computing is a computing model in which applications, data and IT resources are provided to users through the network in the form of services; Cloud computing is also a methodology for infrastructure management, where large amounts of computing resources are combined into IT resource pools to dynamically create highly virtualized resources for use by users. IBM sees cloud computing as a virtualized pool of IT resources.
The definition of the concept of cloud computing from The University of California, Berkeley: "Cloud computing is the application services on the Internet and the hardware and software facilities providing these services in the data center. The application services on the Internet have been called 'software as a service', while the hardware and software facilities in the data center are called 'cloud'".
The National Institute of Standards and Technology (National Institute of Standards and Technology) of the Information Technology laboratory for the definition of the concept of cloud computing: "cloud computing is a kind of resource utilization pattern, it can be easy to approach and access through the network in the form of on-demand using configurable computing resources (network, servers, storage, applications, services, etc.), these resources can be rapid deployment, and with the minimum cost management or service provider to carry out a small amount of work only can realize resource release". This definition summarizes the technical characteristics of cloud computing in a technical language.
Beijing "2008 IEEE Web Services International Conference" proposed the concept of cloud computing defined according to object identity: "For users, cloud computing is' IT as a service ', that is, to provide computing, storage, and application services to users from the central data center through the Internet; For Internet application developers, cloud computing is an Internet-level software development platform and operating environment. For infrastructure providers and administrators, cloud computing is a large-scale, distributed data center infrastructure connected by IP networks.
Although there is no unified and authoritative definition of the concept of cloud computing, the connotation of cloud computing has been generally recognized. In a narrow sense, cloud computing is the delivery and use mode of information infrastructure, which is to obtain the required resources through the network in a way of demand and easy extension. The network providing resources is called "cloud". For users, "cloud" can be used on-demand, extended at any time, and paid according to use. Broadly speaking, cloud computing refers to the delivery and use mode of services, which is to obtain information, software, the Internet, and other related services or other services through the network in a way that is needed and easy to expand. In a word, cloud computing is a kind of distributed parallel computing, which consists of virtual computing resources connected through various networking technologies, and provides various services in the form of dynamic computing resources through certain service acquisition protocols.