Let’s start with some basic concepts, what is a web or mobile application backend?
Most applications today use and need to access some data to provide services, which means that that need a way to access and store that data. Besides that, they also need to provide security so that the stored information is not accessible by the wrong actors.
The backend is the infrastructure that supports a web application (or mobile) and provides several services, like authentication, data storage, or the ability to execute code on the cloud.
BaaS, Backend as a Service is a cloud backend infrastructure that provides all the backend services with simple-to-use interfaces and modules, using API calls or different framework plugins.