An extended chord is a type of musical chord that includes notes beyond the basic triad. Typically, a triad consists of three notes: the root, third, and fifth. Extended chords add additional tones, such as the seventh, ninth, eleventh, or thirteenth, creating a richer and more complex sound. These chords are commonly used in various music genres, including jazz and pop. Extended chords can enhance harmonic progressions and provide more emotional depth to a piece. For example, a Cmaj7 chord includes the notes C, E, G, and B, while a C9 chord adds a D note, resulting in a more colorful harmony. Musicians often use these chords to create tension and resolution in their compositions.