A C minor chord is a musical chord that consists of three specific notes: C, E♭, and G. It is known for its darker, more somber sound compared to major chords. The C minor chord is often used in various music genres, including classical, jazz, and rock, to evoke emotions like sadness or introspection. To play a C minor chord on a piano, you would press the C note with your thumb, the E♭ note with your middle finger, and the G note with your pinky. This simple combination creates a rich, full sound that can enhance melodies and harmonies in a song.