Azure App Service Environment. Ase v3 features a simplified deployment experience enabling a highly secure, isolated app hosting environment for you to run. When to use app service environment?
With an app service environment you have more options for: What is app service environment? The first generation of the app service environment (ase v1) was released in late 2015.
The app service environment (ase) is a single tenant instance of the azure app service that injects into a customers azure virtual network (vnet).
If you go to the first link i provided above there is a channel 9 video about half way down the page and if you go to 1:50 seconds the product owner of app services provides a slide and walks through the differences in detail. You can no longer specify your own domain name for your ilb ase, you will now be using the appserviceenvironment.net domain by default. The azure app service environment is an azure app service feature that provides a fully isolated and dedicated environment for securely running app service apps at high scale. Deploying an ilb app service environment.