I'm a new comer to cloud area, i wish to know what it's from fundamental?

What exactly are its advantages? The way it involves use within real existence? Comparison using the existing technologies.

Cloud computing is not a technology, it is a concept. This means all of your data (documents, photo's, music as well as programs) is saved on the central server ('the cloud'). The benefit of this is you can access your individual stuff all your products. If you wish to pay attention to your music from the computer as well as other device: not a problem, becasue it is all 'in the cloud'.