What are the characteristics and significance of triads in music theory, particularly in the context of classical music composition?

Triads are three-note chords made up of a root, third, and fifth. In Classical Music composition, triads are fundamental building blocks used to create harmony and structure. They provide stability and tension, and are essential for creating melodies and harmonies that evoke different emotions. Triads are significant in classical music as they form the basis of chord progressions and help establish the tonality of a piece.