Azure Functions
A serverless compute service that runs small pieces of code in response to events.
Azure Functions is a serverless compute service that runs small pieces of code in response to triggers such as HTTP requests, timer schedules, queue messages, or Blob Storage events, with Azure managing the underlying infrastructure so developers focus on logic rather than servers. The exam distinction: App Service hosts long-running web apps and APIs on a persistent plan, while Functions handle short, stateless, event-driven workloads billed only during execution. The default Consumption plan scales automatically to zero, eliminating idle costs, though Functions can also run on an App Service plan for always-on behavior.
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