The true value of software-as-a-service (SaaS) and cloud-based software has yet to be fully realized, as IT departments have raised justifiable concerns around the security, reliability, and integration of cloud technologies.
Business Model.
Here is a great definition from InvestorWords:
Business Model: A description of the operations of a business including the components of the business, the functions of the...
A Service Model describes how a service provider creates value for a given portfolio of customer contracts by connecting the demand for service from the assets of its customers with the service...