Understanding Public Clouds: IaaS, PaaS, and SaaS

In this blog post Keith Pijanowski describe Cloud Computing in terms of Infrastructure as a Service (Iaas), Platform as a Service (PaaS) and Software as a Service (SaaS). To guide this discussion he answers the following questions for each of these Cloud offerings:Who is the customer? What service is being provided?, What is being hosted? What is the pricing structure? What are some real world examples?