Author: Inderpreet
Now a days "Cloud Computing" is the hot technology. All the big bosses of the IT market are busy in offering there services through cloud computing. Need for the cloud computing is felt when there is need to increase capacity or add capabilities on the fly without investing in new infrastructure, training new personnel, or licensing new software. Cloud computing changes the economics of IT by enabling you to pay only for the capacity that you actually use. Compute capacity can be scaled up or down on demand to accommodate changing workloads and business requirements.
More technicaly, we can say that Cloud computing is a term often applied to programs that are presented in a Web browser, but the actual computing is performed at a distant data center. It is Internet ('cloud') based development and use of computer technology ('computing'). The cloud is a metaphor for the Internet (based on how it is depicted in computer network diagrams) and is an abstraction for the complex infrastructure it conceals. It is a style of computing where IT-related capabilities are provided “as a service”, allowing users to access technology-enabled services from the Internet ("in the cloud") without knowledge of, expertise with, or control over the technology infrastructure that supports them. [source:wikipedia]
Companies such as Amazon, Google and Salesforce.com have embraced the concept of delivering software over the Internet, as it can mean lower costs and less maintenance for those who use the applications. Microsoft is also going to release an OS for developers to code the applications for cloud computing. , IBM announced its Blue Cloud initiative, offering a package of hardware and software to allow its customers to create their own internal clouds. The company had already partnered with Google to provide cloud solutions for six American universities a month earlier. IBM hopes to grow the program to allow more universities and corporate and government entities to join in. Many companies are offering hardware designed to operate on cloud networks, including Hewlett Packard, Dell and Clear Cube.
Figure [Source:ivanov.wordpress.com/2008/05/01/cloud-computing/]
Cloud computing is often confused with grid computing (a form of distributed computing whereby a "super and virtual computer" is composed of a cluster of networked, loosely-coupled computers, acting in concert to perform very large tasks), utility computing (the packaging of computing resources, such as computation and storage, as a metered service similar to a traditional public utility such as electricity) and autonomic computing (computer systems capable of self-management). Indeed many cloud computing deployments are today powered by grids, have autonomic characteristics and are billed like utilities, but cloud computing can be seen as a natural next step from the grid-utility model. [Source:wikipedia]
Advantages
Inexpensive: Using cloud computing, we avoid the purchase of costly hardware, space to place the hardware and all other support for running that hardware properly.
Easy to maintain: You are just purchasing the service from service providers like Google, Amazon, IBM etc. So they provide you service for that.
Easy to update: You wouldn't have to worry about updating your software that would all be taken care of for you. You could just program and use your application on the purchased services.
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