video on cloud computing

Cloud computing is the delivery of computing as a service rather than a product, whereby shared resources, software, and information are provided to computers and other devices as a metered service over a network (typically the Internet).
Computing clouds provide computation, software, data access, and storage resources without requiring cloud users to know the location and other details of the computing infrastructure. Within limits, cloud users can consume any amount of these resources without having first to acquire servers or other computing equipment. A parallel to this concept can be drawn with the electricity grid, wherein end-users consume power without needing to understand the component devices or infrastructure required to provide the service.

Technology

Infrastructure as a Service (IaaS)
This is the base layer of the cloud stack.
It serves as a foundation for the other two layers, for their execution. The keyword behind this stack is Virtualization.
Let us try to understand this using Amazon EC2. In Amazon EC2 (Elastic Compute Cloud) your application will be executed on a virtual computer (instance). You have the choice of virtual computer, where you can select a configuration of CPU, memory & storage that is optimal for your application. The whole cloud infrastructure viz. servers, routers, hardware based load-balancing, firewalls, storage & other network equipments are provided by the IaaS provider. The customer buy these resources as a service on a need basis.
Platform as a Service (PaaS)
Now you don’t need to invest millions of $$$ to get that development foundation ready for your developers. The PaaS provider will deliver the platform on the web, and in most of the cases you can consume the platform using your browser, i.e. no need to download any software. It has definitely empowered small & mid-size companies or even an individual developer to launch their own SaaS leveraging the power of these platform providers, without any initial investment.
PaaS Layers
Cloud OS
Cloud Middleware

Cloud Computing Trends

What is Cloud Computing?

In late 90s or even now, ask any web developer, solution architect or anyone involved in web application development in any capacity:

Which symbol do you use to represent Internet on numerous white-board meetings? Obviously the most widely used metaphor for Internet was/is cloud. Cloud computing has derived its name from the same line of thinking.

Cloud Computing is a style of computing which must cater to the following computing needs: 1. Dynamism 2. Abstraction 3. Resource Sharing

Dynamism

Your business is growing exponentially. Your computing need & usage is getting bigger with every passing day. Would you add servers & other hardwares to meet the new demand?

Assume, Recession is back & your business is losing customers. The servers & hardwares you added during last quarter’s peak season is now idle. Will you sale them? Demand keeps on changing based on world/regional economy, sometimes seasonal traffic burst as well.

That’s where Cloud Computing comes to your rescue! You just need to configure & your provider will take care of fluctuating demand.

Abstraction

Your business should focus on your core competency & should not worry about security, OS, software platform , updates and patches etc. Leave these chores to your provider.

From an end users perspective, you don’t need to care for the OS, the plug-ins, web security or the software platform. Everything should be in place without any worry.
Resource Sharing

Resource Sharing is the beauty of Cloud Computing. This is the concept which helps the cloud providers to attain optimum utilization of resources. Say, a company dealing in gifts may require more server resources during festive season. A company dealing in Payroll management may require more resources during the end or beginning of the month.