Timbre, often referred to as the "color" or "quality" of sound, is what makes different musical instruments and voices sound unique. For example, the sound of a piano is distinct from that of a violin, even when they play the same note. This difference arises from the harmonic content and the way sound waves are produced. Timbre is influenced by various factors, including the material of the instrument, the technique used to produce sound, and the environment in which the sound is heard. Understanding timbre helps musicians and composers create richer and more varied music, enhancing the overall listening experience.