A V-vii/vi Cadence is a harmonic progression that resolves from a dominant chord (V) to a leading tone chord that functions as a vii chord of the relative minor key (vii/vi). This cadence creates a strong sense of resolution, often used to transition smoothly into the tonic or establish a connection between related keys. It highlights the relationship between the major and minor tonalities and demonstrates the use of secondary leading tone chords in tonal harmony.