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

• A trigger defines how and when a function is invoked.
• 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!");