Leverage on research/importance on IaaS

Infrastructure as a Service (IaaS) - Its is On Demand process, which access to virtualized It Infrastructure through internet.

How this Service helps in computing, networking, storage which helps Cloud providers maintain and monitor the physical infrastructure to deliver IaaS. 

Main criteria for my research about Hoe this service helps current backbone clouds like AWS, that leverage it's Enterprise in more focus on development and management and also how it is differentiated with PaaS

Detailed analysis and research needed to write in APA format with 4 pages with needed diagrams and references