The cloud can be both Software & Infrastructure.
A Cloud service is accessible through either via a webbrowser or WebServices API.
You pay only for what you use..
SAAS(Software as a Service) is a term that basically refers to Software in the Cloud..
SAAS is a web based software model that makes the software available entirely thu a browser
Examples::Gmail,SalesForce.com are the basic exampless;
For instance:Salesforce is an enterprise CRM app you can jus sit before the system and access the url of the salesforce /gmail they can directly accessthe mail/salesforce CRM application
SAAS Characterstics:
Avaialability via thru a webbrowser
On demand avaialabilty
Payments terms used on usage
Minimal IT demands
Coming to the Hardware Virtualisation --> Amazon Webservices (AWS) Through AWS we can divide one physical server into any no: of virtual servers The Amazon solution is an extension of popular open source virtualisation called XEN.
Cloud Storage:
Elements of Cloud Computing involves in dividing the data into small chunks and storing the data with some check sums across multiple servers.So -->Parallel programming will be done
Data can be retrieved rapidly
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