Platform as a Service (PaaS)
The platform represents the middle layer. Here, it is not so much the IT administrator who is needed, but the software developer.
Platform as a Service is a service that enables the developer to develop and execute his own programs on the offered infrastructure via interfaces. For this purpose, the PaaS provider provides development environments in the form of frameworks. In doing so, the PaaS provider makes specifications for the programming languages and interfaces to be used, for data storage, networks and data processing systems. However, the developer has no possibility of accessing the infrastructure used to provide the service in an administrative or controlling manner. He can only control the programs and data that he himself contributes.
The advantages of PaaS
PaaS also offers cost savings because systems engineers no longer need to manage the network layer, operating system, or server hardware, as users rent it from the provider for a subscription fee.
In simple terms, the choice between the two models is a matter of flexibility and simplicity. IaaS offers customers flexibility: they get access to virtual machines and can set up their own servers and databases as needed after installing the desired middleware software. PaaS platforms, on the other hand, hide the underlying hardware, allowing users to access databases and web servers without having to install and configure the applications themselves. This eliminates the complexity of the middleware infrastructure, since all the resources needed to develop and generate the applications and services to be delivered are made available over the Internet.