For the chromatic scale, the octave is divided into twelve equal parts, each semitone (half-step) is an interval of the twelfth root of two so that twelve of these equal half steps add up to exactly an octave. With fretted instruments it is very useful to use equal temperament so that the frets align evenly across the strings.
The chromatic scale's octave is segmented into twelve identical segments, each semitone being a twelfth root of two interval, totaling an octave when combined in equal measure. This system proves beneficial for fretted instruments by ensuring even string alignment.