The ‘Chromatic Scale’ in traditional Western music theory simply refers to every one of the 12 available notes. Starting with a C note the scale is spelled out as follows:
C – C#/Db – D – D#/Eb – E – F – F#/Gb – G – G#/Ab – A – A#/Bb – B – C
The pattern will repeat itself over and over no matter what note you start on and each note is one fret apart.