Which App Service feature enables a web app to scale automatically based on demand?

Auto Scale is the App Service feature that automatically adjusts the number of instances running your web app based on predefined rules and metrics, such as CPU usage or HTTP queue length. This ensures your application can handle varying loads efficiently. An App Service Plan defines the underlying compute resources for your app but doesn't inherently provide automatic scaling. App Configuration is a service for managing application settings and feature flags, not for scaling. Deployment Slots are used for staging and testing new versions of your application before swapping them into production, not for automatic scaling based on demand.