The Gsus4 chord is a suspended fourth chord built on the root note G. It consists of the notes G, C, and D. The "sus" in Gsus4 stands for "suspended," indicating that the third note of the chord is replaced by the fourth note, creating a sense of tension that typically resolves back to a major or minor chord. In music, Gsus4 is often used in various genres, including rock, pop, and jazz. It adds a unique sound to progressions, making it a popular choice for songwriters and composers looking to create emotional depth or a sense of anticipation in their music.