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3 Technologies to Build Clouds

In a simple terms, Cloud computing means, data and computing is done in Cloud.
Cloud computing is an environment is a combination of Hardware, Systems Software and Applications.

The cloud which is available to the public is called PUBLIC cloud.
The cloud which is available to the particular Business/Company is called PRIVATE Cloud.
Hybrid Cloud- A private cloud is maintains all the resources that needed, in case of emergency, it takes resources from PUBLIC cloud.

Cloud

Cloud services (remote data and computation) are exposed as simple and user-friendly web services.

For example, Microsoft's ADO.NET (originally called Astoria)  provides the tools to expose any data object from a collection, stored in a database or other form, as a URI to an encoded form using a standard such as JSON or ATOM representation

Google's AppEngine provides a way to deploy a remote Python script that becomes a web service that can access data in their BigTable database system.

To deliver highly available and flexible services (i.e., computation as a service), and owing to the maturity of virtualization technology, Virtual Machines (VMs) are used as a standard for object deployment in the cloud.

VMs decouple the computing infrastructure from the physical infrastructure.

VMs allow the customization of the platform to suit the needs of the end-user. For example, in the Amazon Elastic Compute Cloud (EC2), the customer selects his/her preferred VM image (virtual appliance) from a list of various versions of Linux and Windows servers

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