PaaS stands for Platform as a Service. The difference between PaaS and aPaaS is minimal. It happens when people mention PaaS, they actually mean aPaaS. PaaS can be seen as the container where aPaaS and Integration as a Service (not to be confused with IaaS) fall into. With aPaaS, you can develop applications and use the platform that comes with it. Integration as a Service is a model that ensures complete cloud integration and the possibility of real-time data sharing between systems and any third party.