What is the significance of sus chords in music theory and how are they used in creating harmonies?

Sus chords in Music Theory are significant because they create a sense of tension and release in harmonies. They are used by replacing the third of a chord with either a second or a fourth, creating a unique sound that can add color and interest to a chord progression. This tension created by sus chords can then be resolved by returning to a more stable chord, adding depth and emotion to the music.