What does cloud computing mean

When the world's first computer was unveiled at the University of Pennsylvania in Philadelphia on February 14, 1946, in the face of this 18,800 vacuum tube, 50 feet long, 30 feet wide, covers 1500 square feet, weighing up to 30 tons (about a half of the classroom, six elephants Heavy) "mega" Computer, no one can think of, in the era of electron tubes, transistors, integrated circuits and LSI, more than 60 years later the PC can only be a book thick.

When the U.S. Defense Advanced Research Program (ARPA) in the early 70 when the office of several computers connected to use, they will never think more than 30 years later, ordinary people can also see through the internet Wikipedia declassified U.S. Department of Defense Confidential documents.

Today, although we have a high-speed personal computer, although we have a large number of information storage network, but the development of science and technology is endless, the rapid development of information technology will bring a better life for mankind, a new concept has been the IT industry pointed out the direction of development, this is the cloud computing.

So what is cloud computing?

Cloud computing, as its name suggests, is the way to compute the cloud. Of course, the "cloud" here is not the white clouds floating in the blue sky. It's a generic term for all the resources that are distributed across the Internet. The internet as a metaphor for the blue sky, all the resources available on the internet called "cloud", using the Internet "cloud" to serve me, is called "Cloud computing"! Google scientists are still very poetic.

So the professional explanation we see about cloud computing is this: cloud Computing (cloud computing) is a commercial, massively distributed computing technology. That is: The user can through the existing network will be required by the vast number of computing processes automatically divided into numerous smaller subroutines, and then to the multiple servers composed of a larger system, after the search, calculation, analysis of the processing results back to the user.

The simplest cloud computing technology is ubiquitous and familiar to us in Web services, such as search engines, Web mailboxes, etc., where users can get a lot of information by simply typing in a simple command. In the Future "cloud computing" services, "cloud computing" is not only to do data search, but also to provide users with a variety of computing technology, data analysis and other services. Through "cloud computing", people can use the PC and network at hand to handle tens or even billions of information in a few seconds, get the same powerful network service as "supercomputer" and get more and more complex information calculation. For example, analyze the structure of DNA, the sequencing of gene maps, the analysis of cancer cells, and so on. Common people commonly used, in the cloud, the future mobile phones, GPS and other action devices can be developed guise, dizzying variety of application services.

In cloud computing, "cloud" is not only a source of information, but also a series of virtual computing resources that can be maintained and managed, such as large computing servers, storage servers, broadband resources, and so on. Cloud computing will all the information resources and computing resources together, the software implementation of automatic management, without human involvement. Users only need to set goals, and all transactional things to the "cloud". It can be seen that cloud computing is not a pure product, nor is it a new technology, but an innovative way of generating and acquiring computing power. One explains: Cloud computing is a service that can be it and software or any other Internet-related service.

For real "cloud computing", information resources, computing services, software support and business models, these four elements, one can not be less. In a nutshell: Cloud computing is a commercially upgraded version of Grid computing.