A piano mute is a device used to dampen the sound produced by a piano, allowing for quieter practice or performance. It typically consists of felt or rubber materials that are placed between the strings and hammers, reducing the volume without altering the pitch. This feature is especially useful in shared living spaces or during late-night practice sessions. Using a piano mute can help pianists focus on their technique without disturbing others. It is commonly found in upright pianos and can be a valuable tool for both beginners and advanced players who want to practice discreetly.