The term "Dsus2" refers to a suspended second chord built on the note D. In this chord, the third note of the D major scale is replaced by the second note, which is E. This creates a unique sound that adds tension and anticipation, often resolving to a more stable chord like D major or D minor. In guitar playing, the Dsus2 chord can be played by placing fingers on specific frets to create the desired notes. It is commonly used in various music genres, including rock, pop, and folk, to enhance the harmonic texture of a song.