What is the significance of the coda in music notation and how does it affect the overall structure of a musical piece?

The coda in music notation is a section at the end of a piece that provides a sense of closure and finality. It often contains a unique musical idea or theme that brings the composition to a satisfying conclusion. The coda affects the overall structure of a musical piece by signaling to the listener that the end is near and helping to create a sense of resolution and completion.