We’ve all heard of it and we all use it (gmail, yahoo mail, Google docs, Facebook, salesforce.com are just a few examples). But what is cloud computing?
Put simply cloud computing means storing and accessing data and programs over the Internet instead of accessing them from your computer's hard drive.
There are three service delivery models. With each cloud service model, certain responsibilities are shifted to the cloud service provider allowing you to focus more on your own business requirements and less on the underlying technologies.
The three models are:
Infrastructure as a Service contains the basic building blocks for cloud IT and usually provides access to networking features, computers, and data storage space.
Platform as a Service removes the need for you to manage the underlying infrastructure (usually hardware and operating systems). It lets you concentrate on the deployment and management of your applications.
With Software as a Service the entire application or service is delivered over the web through a browser and or via an API. With a SaaS offering you do not have to think about how the service is maintained or how the underlying infrastructure is managed; you only need to think about how you will use that particular piece software.
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