What are the differences between playing in drop D tuning and standard D tuning on the guitar?

The main difference between playing in drop D tuning and standard D tuning on the guitar is that in drop D tuning, the lowest string is tuned down a whole step to D, while the rest of the strings remain in standard tuning. This allows for easier power chords and heavier riffs. In standard D tuning, all strings are tuned one whole step down to D, resulting in a lower overall pitch for all notes played.