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An organization is deploying an event-driven serverless solution in Azure to process invoices. The development team needs the application code to execute automatically whenever a new document is uploaded to Azure Blob Storage, without provisioning or maintaining persistent virtual servers.
Which Azure Functions feature should the team configure to initiate code execution in response to this cloud event?
An Azure Functions trigger is an architectural construct that defines how a serverless function is invoked. Triggers monitor specific cloud event sources—such as HTTP webhooks, scheduled timers, message queues, or storage events—and pass relevant payload data to the function code upon execution.
In a serverless environment, applications do not run continuously waiting for input. Instead, the Blob Storage trigger (or an Event Grid event subscription on the container) listens for newly uploaded files. As soon as a document arrives, the platform allocates compute resources dynamically, runs the function, and releases those resources immediately afterward.
A function trigger is the native, purpose-built mechanism in Azure serverless computing for running on-demand code without dedicated server infrastructure.
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