A webhook sends a notification (an HTTP request with event details) to a URL you specify whenever something happens in FieldForms — a form submission completes, a form is published, and so on.
Go to Automation → Webhooks → New webhook, paste the receiving system's URL, and choose which events should trigger it.
Open a webhook's detail page to see its recent delivery attempts and whether each succeeded or failed, including the response the receiving system sent back — useful for debugging an integration with your own team or a vendor's.