What is the role of a trigger in an Azure Function?

Short answer: A trigger defines how and when a function is invoked.

Explain a bit more

Examples: HTTP requests, queue messages, blob changes, timer events. Every function must have exactly one trigger. Example (HTTP trigger): [FunctionName("HttpTriggerFunction")] public static IActionResult Run( [HttpTrigger(AuthorizationLevel.Function, "get", "post")] HttpRequest req, ILogger log) { log.LogInformation("HTTP trigger executed."); return new OkObjectResult("Hello from Azure Function!");

Real-world example (ShopNest)

Order-paid events go to Service Bus; an Azure Function sends the confirmation email asynchronously.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.