For a slide, the pitch of the played string is changed by sliding the finger of the fret hand up or down over the string from the original to the final note. All intervening sounds are also audible. The result is an axial vibrato. The slide is a form of portamento, an ornamental technique in which notes are connected together in a sliding motion.

A glissando is a pitch motion, a continual becoming. A tone, however, is a being, an individual.¹⁾