The ASE is a feature of Azure App Service that provides a fully isolated environment for your Web Apps, mobile apps, API apps, and Azure Functions. An ASE is deployed inside a subnet of the VNet, so this provides full isolation and secure network access. ASEs are most suitable for apps that require high-scale workloads because they can be spread across a single or multiple Azure regions. Because of the network isolation, ASEs are also very suitable for apps with high security requirements.
There can only be one ASE created per Azure subscription and it can host up to 100 instances; from 100 app instances in a single App Service plan to 100 App Service plans with one app instance.
ASEs use frontends and workers ...
