What is a coda in music and how does it contribute to the overall structure of a musical piece?

A coda in music is a concluding section that provides a sense of closure to a musical piece. It typically appears at the end of a composition and often includes a recapitulation of themes or a final statement. The coda contributes to the overall structure of a musical piece by signaling the end of the piece and providing a sense of resolution or finality to the listener.