The dorian mode is a musical scale characterized by a specific sequence of whole and half steps, forming a unique sound that has been used since ancient times. It is the second mode of the diatonic scale, meaning it starts on the second degree of the major scale, giving it a distinctively minor quality with a raised sixth degree. This mode plays an important role in both ancient and medieval music, often conveying a sense of melancholy while also allowing for uplifting melodies.