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Feedback
A response that confirms a user action took effect.
Feedback is anything the system shows in response to what the user just did. Click a button — it dims. Submit a form — a toast appears. Drag an item — the drop area highlights. Without feedback, the user wonders if their action even registered.
Good feedback is immediate, in-context, and clear. Bad feedback is delayed, hidden in a corner, or tells you nothing about what happened. Every interactive element should give some response within 100 milliseconds.