Which attribute of the form element specifies where to send the form-data when the form is submitted?

The action attribute of the form element defines the URL (or URI) where the form data should be sent after submission. This can be a URL of a server-side script (like PHP, Python, etc.) that processes the form data and sends a response back to the user. The choice of where to send the data is crucial as it determines how the data will be processed and handled on the server side.