Born-in-the-cloud web apps

In the past, there was an additional offering called Website as a Service, which provided websites and web services running on an IIS stack on cloud technology. Today, this feature is called web apps or even born-in-the-cloud apps. So what is this? Is it only a name change or a complete technology change? As you already know, the most common answer as a consultant is "it depends," and so it is here too. If you are only running a website (for example, on IIS using a CMS such as Joomla or WordPress), it is nearly only a name change from your point of view. But from the technology point of view, a web app is a service that is being provided using Azure Stack technology as a PaaS solution, but underneath, it is nothing more than one or even more VMs that are being managed by Azure Stack. And so what is a cloud-born app? It's a web app that doesn't use technology called client/server. It is a web app running on whatever device (workstation, notebook, tablet, or even mobile device) is connecting to an underlying web service (running on cloud technology or even in the cloud) that in general stores all data to a SQL database.