): In this model, a complete application is delivered on demand to the cloud users. Clients need not invest upfront before using the applications. They use the software subscription based or followed the model Pay-as-you-go, such as Google, Salesforce and Microsoft etc.

Software as a Service (SaaS): In this model, a complete application is delivered on demand to the cloud users. Clients need not invest upfront before using the applications. They use the software subscription based or followed the model Pay-as-you-go, such as Google, Salesforce and Microsoft [9] etc