Watch the Approach 1: Performance online guitar lesson by Vicki Genfan from Rhythm Makeover: Vicki Genfan

Notice the feeling of tension building with the first 3 chords, and then the feeling of tension releasing with the G chord. It’s a powerful technique that is also known as pedal point - keeping one note the same, typically the bass note, and changing the remaining notes in the chord. This is what we’re doing with the D-DMa7-Dsus part of this progression.