Again, this question will test the cloud computing expert’s knowledge of the different types of services offered by cloud computing. There are three different types of service: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). The first one, Infrastructure as a Service, is a hardware facility provided by a third party that also manages it. Platform as a Service consists of the operating system layer, and it is operated by another company as well. Software as a Service regards all applications and programs hosted in the cloud.