+<sup>4</sup> The `Microsoft.Web/sites` resource type is used for App service and Azure functions. In the context of Azure AI Search, an Azure function is the more likely scenario. An Azure function is commonly used for hosting the logic of a custom skill. Azure Function has Consumption, Premium, and Dedicated [App Service hosting plans](../app-service/overview-hosting-plans.md). The [App Service Environment (ASE)](../app-service/environment/overview.md), [Azure Kubernetes Service (AKS)](../aks/intro-kubernetes.md) and [Azure API Management](../api-management/api-management-key-concepts.md) aren't supported at this time.
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