Product : Microsoft Corp, Azure Stack/1903, IaaS + PaaS
Feature : Web Applications, Developer Tools, Platform Services
Content Owner:  Bhagyashri (Shri) Bhagvat
Summary
App Service is available on Azure Stack (additional PaaS offering) which provides web apps
Details
https://docs.microsoft.com/en-us/azure/azure-stack/azure-stack-app-service-overview