The notes in a chord are referred to as “voices” and for this reason specific chords are referred to as being “voicings.   Each voice of a chord has its own individual path to the next chord and this is called “voice leading”.   When each note of the chord is heard as an individual voice with its own tensions and resolution and direction this is called voice leading.  Musical economy in voice leading suggests the shortest path possible to the next voice and new chord in the progression.  Voices in a chord share a vertical or harmonic aspect as well as a horizontal or melodic one.