Azure Container Apps ( ACA ) is a new service https://learn.microsoft.com/en-us/azure/container-apps/ which is an abstraction layer atop of Azure Kubernetes Service ( AKS ) ... it provides a serverless approach so you do not need to handle the underlying AKS infrastructure provisioning ... you create an environment then create a containerapp using that env which offers Continuous Development ... it allows you to scale up or down to zero containers
Azure Container Apps Build and deploy modern apps and microservices using serverless containers https://azure.microsoft.com/en-us/services/container-apps/#overview
Comparing Container Apps with other Azure container options https://learn.microsoft.com/en-us/azure/container-apps/compare-options