. The analogy is , 'If you only need milk , would you buy a cow ?'
This is the fundamental concept of cloud computing.
- Cloud computing is a general term for anything that involves delivering hosted services over the Internet. These services are broadly divided into three categories: Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS). The name cloud computing was inspired by the cloud symbol that's often used to represent the Internet in flowcharts and diagrams.
A cloud service has three distinct characteristics that differentiate it from traditional hosting. It is sold on demand, typically by the minute or the hour; it is elastic -- a user can have as much or as little of a service as they want at any given time; and the service is fully managed by the provider (the consumer needs nothing but a personal computer and Internet access). Significant innovations in virtualization and distributed computing, as well as improved access to high-speed Internet and a weak economy, have accelerated interest in cloud computing.
A cloud can be private or public. A public cloud sells services to anyone on the Internet. (Currently, Amazon Web Services is the largest public cloud provider.) A private cloud is a proprietary network or a data center that supplies hosted services to a limited number of people. When a service provider uses public cloud resources to create their private cloud, the result is called a virtual private cloud. Private or public, the goal of cloud computing is to provide easy, scalable access to computing resources and IT services.
Platform-as-a-service in the cloud is defined as a set of software and product development tools hosted on the provider's infrastructure. Developers create applications on the provider's platform over the Internet. PaaS providers may use APIs, website portals or gateway software installed on the customer's computer. Force.com, (an outgrowth of Salesforce.com) and GoogleApps are examples of PaaS. Developers need to know that currently, there are not standards for interoperability or data portability in the cloud. Some providers will not allow software created by their customers to be moved off the provider's platform.
What does a Shift Towards Cloud Computing Mean?
So who is affected by a paradigm shift in the computing industry? The shift would affect companies a few different sub-industries including software companies, internet service providers and hardware manufacturers. Companies in each of these industries will face significant change if cloud computing is to be the next step for the industry. While it is relatively easy to see how the main software and internet companies will be affected by such a shift, how companies in the internet and hardware will be affected is slightly more dificult.
Growth in the Cloud market
WHO IS ON THE CLOUD ..!!
Almost all the big net giants are now on the cloud and offering on demand services.
The biggest player so far is the Amazon with google and VmWare catching up.
Microsoft hac also lately launched its cloud service called AZURE.
Despite cloud computing being in the media spotlight, only a minority of respondents (5%) say that they use it "a lot" and less than a quarter of those surveyed (19%) reveal that they only use cloud computing sparingly. Almost half of respondents (47%) admit that their company doesn’t use cloud computing with the remaining 29% conceding that they “don’t know” whether their organisation uses it or not.
Still there is a "CLOUD CONFUSION" amongst 41% of IT professionals.
Finally, cloud apps don’t eat up your valuable IT resources. This lets you focus on deploying more apps, new projects, and innovation.
The bottom line: Cloud computing is a simple idea, but it can have a huge impact on your business.