Drop D tuning is a popular guitar tuning where the lowest string, usually the sixth string, is lowered from E to D. This adjustment creates a deeper sound and allows for easier power chords, making it a favorite among rock and metal guitarists. In this tuning, the other strings remain in standard tuning, which means the fifth string is still A, the fourth is D, the third is G, the second is B, and the first is E. This tuning is often used in songs by artists like Nirvana and Led Zeppelin, as it provides a unique tonal quality. Guitarists can play a variety of chords and riffs more easily, especially those that require the use of the lower D string. Overall, Drop D tuning enhances the versatility of the guitar and opens up new creative possibilities for musicians.