A D Major chord is a basic musical chord that consists of three notes: D, F#, and A. It is built on the root note D, with F# being the major third and A the perfect fifth. This chord is commonly used in various music genres, including pop, rock, and classical. To play a D Major chord on a guitar, you typically place your fingers on the second fret of the G string, the third fret of the B string, and the second fret of the high E string. On a piano, you can play it by pressing the D, F#, and A keys simultaneously.