IaaS is the most flexible cloud computing model and allows automated deployment of servers, processing power, storage, and networking. IaaS clients have true control over their infrastructure than users of PaaS or SaaS services. The main uses of IaaS include the actual development and deployment of PaaS, SaaS, and web-scale applications.
IaaS providers offer these cloud servers and their associated resources via a dashboard and/or API. IaaS clients have direct access to their servers and storage, just as they would with traditional servers but they gain access to a much higher order of scalability.