D Major chord in the 1st position below.

D – Root
F# – 3rd
A – 5th

When played on guitar the notes are in this order D, A, D, F#. The D is the Root note. F# is the 3rd note in the D major scale and the A is the 5th note in the D major scale.

We only strum the top 4 strings, mute the other two strings. The D major chord can be played in many places on the guitar. In this example, we are talking about the D in 1st or open position. Chords in the open position are often referred to as campfire chords.