What purpose do 'leitmotifs' serve in orchestral music?

Leitmotifs serve as a fundamental compositional technique in orchestral music, particularly prominent in the works of composers like Richard Wagner. By associating specific musical themes with characters, emotions, or particular narrative ideas, leitmotifs help to provide continuity and cohesion throughout a piece. They allow listeners to develop associations with specific characters or concepts, enhancing emotional engagement and understanding of the narrative. This technique deepens the storytelling aspect of the music, creating a richer listening experience as the motifs reappear and evolve alongside the unfolding drama.