A chromatic scale is a musical scale that consists of twelve pitches, each a half step apart. It includes all the notes within an octave, using both the natural notes and their sharp or flat counterparts. For example, in the key of C, the chromatic scale would include C, C#, D, D#, E, F, F#, G, G#, A, A#, and B. Chromatic scales are often used in music to create tension or to transition between different keys. They can be played ascending or descending and are fundamental in various musical genres, including classical, jazz, and pop. Musicians use chromatic scales for practice and to develop their technique.