The C♯ Dorian scale has 7 notes: C♯ – D♯ – E – F♯ – G♯ – A♯ – B. Dorian is a minor scale with a bright major 6th. That one note lifts the sadness of the natural minor and gives a cool, soulful sound: the scale of funk vamps, Santana solos and modal jazz. In Indian music it is Kafi thaat.
C♯ and D♭ are the same pitch, so this page covers both names; the notes are spelled from C♯, the way the key is usually written. Compared with the C♯ major scale it has ♭3 (E instead of E♯), ♭7 (B instead of B♯).
The explorer above is set to C♯ Dorian: the whole neck is mapped, and you can zoom into any of its 7 positions, change the labels to degrees or fingers, and hear it up, down and in patterns.