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Cloud Computing is a super-computing model based on the internet. In remote data centers, thousands of computers and servers are connected to form a computing cloud. Cloud Computing can even deliver 10 trillion operations per second, and such powerful computing capability can simulate nuclear explosions, predict climate change and forecast market trends. Users access the data center via computers, laptops, mobile phones and other devices, and perform computations based on their needs.
So, how do IT professionals view Cloud Computing?
Thomas Watson, founder of IBM, once stated that the world only needs 5 computers. Bill Gates said in a speech that 640K of memory is enough for personal users. Kai-Fu Lee made a vivid analogy with money shops. In the early days, people kept their money under the pillow. Later came money shops, which were safe but inconvenient to withdraw from. Now banking has evolved so you can withdraw money at any branch, through ATMs or even overseas channels. It is like using electricity: you do not need a generator at home; you simply buy power from the utility company.
Cloud Computing is this kind of transformation. Professional internet companies like Google and IBM build computing storage and processing centers. Users can conveniently access them through a network connection and a browser, using the "cloud" as a center for data storage and application services.
In a narrow sense, Cloud Computing refers to the delivery and usage model of IT infrastructure, where required resources (hardware, platforms, software) are obtained on-demand and in a readily scalable manner over the network. The network that provides resources is called the "cloud." Resources in the "cloud" appear virtually unlimited to users, are available at any time, used on demand, scaled at will and charged by usage. This characteristic is often described as using IT infrastructure like water and electricity.
In a broad sense, Cloud Computing refers to the delivery and usage model of services, where required services are obtained on-demand and in a readily scalable manner over the network. These services can be IT and software or internet-related, or any other type of service.
Cloud Computing is the evolution of Distributed Computing, Parallel Computing and Grid Computing, or the commercial realization of these computer science concepts.
The basic principle of Cloud Computing is distributing computation across a large number of distributed computers rather than local computers or remote servers, making enterprise data center operations more similar to the internet. This enables enterprises to allocate resources to the applications that need them and access computing and storage systems on demand.
This is a revolutionary approach. By analogy, it is like shifting from the old model of individual generators to centralized power supply from a power plant. It means computing power can be circulated as a commodity, like gas, water and electricity, convenient to use and low in cost. The biggest difference is that it is transmitted over the internet.
The blueprint of Cloud Computing is taking shape: in the future, you will only need a laptop or a phone to accomplish everything through network services, including tasks like supercomputing. From this perspective, end users are the true owners of Cloud Computing.
The concept behind Cloud Computing applications is to pool resources together and make them available to each member.
1. Security: Cloud Computing provides reliable and secure data storage centers, so users no longer need to worry about data loss or virus attacks.
2. Convenience: It has minimal requirements for client-side devices and is easy to use.
3. Data sharing: It enables easy sharing of data and applications across different devices.
4. Unlimited potential: It provides virtually unlimited possibilities for using the network.
Source: 51CTO.com