from fastapi import BackgroundTasks, FastAPI app = FastAPI() def send_email(address: str, message: str): # code for sending email here return @app.post("/send_email") async def send_email_endpoint(address: str, message: str, background_tasks: BackgroundTasks): background_tasks.add_task(send_email, address=address, message=message) return {"message": "Email sent successfully!"}In this example, we have defined a function `send_email` that takes an email address and a message as parameters and sends an email. We then define a POST endpoint that takes the same parameters as inputs and passes the `send_email` function to the `add_task` method of the `BackgroundTasks` object, which gets added to the background tasks queue. Finally, the endpoint returns a message indicating that the email has been sent. Overall, BackgroundTasks is an incredibly useful library for executing long-running operations without blocking the main event loop of your application.