Cloud computing implies sharing access to resources through the connected devices of the users anywhere in the world at any time. It revolves around the use of virtualization to share large databases around the globe cost effectively. It provides better scalability and high degree of availability due to the architecture of huge data centers. The core benefit of cloud computing lies with the fact that it involves no upfront cost and has better network bandwidth utilization.
are the ones which are built over the Internet and can be accessed by anyone who has paid for the service. Such clouds are usually owned by service providers. Some common public clouds include Microsoft Azure, Google App Engine, Amazon AWS etc.
are the ones which are owned and managed by a particular client. Such clouds exist within the domains of a specific organization. These are used internally within an organization or used by partners too. They are based on internal infrastructure of datacenters owned by the company itself.
Hybrid clouds are a mixture of public and private clouds and operate in a middle way between them. They lease public cloud services yet maintain a higher degree of security and privacy.
allows users to rent storage, processing, and various resources for running their application. In this model, user do not have the control to manage the underline infrastructure of the cloud, yet the user is given control over OS, storage and selection of various network components. In short, IaaS comprises of communication, computation and storage as a service. Amazon EC2 is an example of IaaS cloud business model.
allows users to have a collaborative software development platform through programming languages and software tools. Here, the user does not have control over underline cloud infrastructure, yet it provides user the platform for application development, testing and operation.
is associated with web hosting, which implies the browser initiated application software.
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thanks for the elaborate post, at least I am learning something now
I hadn't realized that cloud computing was quite this elaborate. I'm glad I saw this post, as I had been curious about SaaS, and now I have at least a basic idea of what it refers to.