API Apps are part of the Azure App Service suite that also includes web apps, mobile apps, and logic apps.
An API app is an Azure App Service web app with additional features that enhance the experience of developing, deploying, publishing, consuming, managing, and monetizing RESTful web APIs.
That means API apps share with web apps all the web hosting features of the Azure App Service platform:
- Automatic OS patching
- Enterprise grade security
- High availability
- Auto scaling and load balancing
- WebJobs for background processing
- Quick and easy deployment, and many continuous delivery options