Azure Functions is a serverless, event-driven compute service that automatically scales and eliminates infrastructure management. It is ideal when you simply want to run code in response to events.
Azure Virtual Machines give you full control of the operating system and therefore require you to patch and maintain the server.
Azure Kubernetes Service orchestrates containers and, although Azure manages the control plane, you still configure and maintain your container images and agent nodes.
Azure App Service is a fully managed PaaS for hosting long-running web apps and APIs; it abstracts the underlying servers, so it is not typically chosen for short-lived, event-driven functions.
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Microsoft Azure Fundamentals AZ-900
Azure Architecture and Services
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