Extended chords are musical chords that include additional notes beyond the basic triad. A standard triad consists of three notes: the root, third, and fifth. Extended chords add more tones, such as the seventh, ninth, eleventh, or thirteenth, creating a richer and more complex sound. For example, a Cmaj7 chord includes the notes C, E, G, and B. These chords are commonly used in various music genres, including jazz, blues, and pop. They provide harmonic depth and can evoke different emotions, making them a popular choice for composers and musicians. Understanding extended chords can enhance one's ability to create and appreciate music.