A coroutine is a special kind of function that can pause and resume its execution, allowing asynchronous programming.Coroutine objects represent tasks that haven’t run yet and must be awaited inside an async function to actually execute the code and get the result.When you call an async function, it returns a coroutine object, which needs to be awaited to run the code and obtain the result.In a FastAPI app, async functions return coroutine objects that need to be awaited so that FastAPI can send the actual data in the response.