Drop D tuning is an alternative form of guitar tuning in which the lowest string is tuned down from the usual E of standard tuning by one whole step to D. So where standard tuning is EADGBe, drop D is DADGBe.

What is the purpose of drop D tuning?

Drop D contributes a “heavier sound.” The loosened bottom string in drop D tuning will sound heavier, with more low-frequency rumble. Drop D makes it easy to play power chords. Simply strum straight across the bottom three strings in a drop D guitar, and you'll be strumming the 3 notes of a power chord.

Is Drop D easier to play?

Drop Tuning is very easy to play. It does not only provide the possibility to play most chords with only one finger, but also typical progressions in the metal genre are closer to each other because of the "two-steps-down" tuning on the first string.