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Cloud Computing · Foundational

Azure Functions

Azure serverless compute service that runs event-triggered code with automatic scaling.

Definition

Azure Functions run code in response to triggers such as HTTP, timers, queues, Event Grid, Event Hubs and Cosmos DB changes, using bindings to connect to data without boilerplate. Hosting options include Flex Consumption, Consumption, Premium (pre-warmed instances, VNet), Dedicated (App Service plan) and Azure Container Apps.

Example

A timer-triggered function runs every night at 2 AM to purge expired records from a database.

Exam tip

Consumption plan executions are time-limited and can cold start; Premium removes cold starts with pre-warmed instances.

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