In music theory, the term "subdominant" refers to the fourth degree of a diatonic scale. For example, in the key of C major, the subdominant note is F. This note plays a crucial role in creating tension and resolution within a musical piece, often leading to the dominant chord, which is the fifth degree of the scale. The subdominant chord is built on the subdominant note and typically consists of three notes: the root, the third, and the fifth. In the case of F major, the chord includes the notes F, A, and C. This chord is commonly used in various musical genres to enhance harmonic progressions and add depth to compositions.