The D Lydian scale has 7 notes: D – E – F♯ – G♯ – A – B – C♯. Lydian is the major scale with a raised 4th. That ♯4 floats instead of resolving, giving a dreamy, magical sound loved by film composers. In Indian music it is Kalyan thaat, the scale of raga Yaman.
Compared with the D major scale it has ♯4 (G♯ instead of G).
The explorer above is set to D Lydian: 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.