A small, transient message that slides in at the edge of the screen to confirm an action, then dismisses itself without taking focus or blocking the view.
Saving shows a toast: ‘Draft saved’, bottom-left, gone in four seconds, with no button to chase.
A toast is the interface clearing its throat, not stopping the conversation. The rule: nothing that matters lives only in one. It disappears, and it never takes focus, so anything a person must act on belongs somewhere permanent. Stack three and they become a feed nobody reads. The best toast is the one you half-notice and trust.