In this section, we are going to learn about how we can separate IaaS, PaaS, and SaaS at the service level:
As the previous diagram suggests, we have the first column as OPS, which stands for operations. That means the bare minimum requirement for any typical server. When we are going with a server to buy, we should consider the preceding features before buying.
It includes Application, Data, Runtime, Framework, Operating System, Server, Disk, and Network Stack.
When we move to cloud and decide to go with IaaS—in this case we are not bothered about server, disk, and network stack. Thus, the headache of handling hardware part is no more with us. That's why it is called Infrastructure as a Service.
Now if we think of PaaS, we should not be worried about runtime, framework, and operating system along with the components in IaaS. Things that we need to focus on are only application and data.
And the last deployment model is SaaS—Software as a Service. In this model we are not concerned about literally anything. The only thing that we need to work on is the code and just a look at the bill. It's that simple!