A coda in classical music is a short section added to the end of a piece of music to enable a smooth conclusion.
This name makes sense, since it is Italian for “tail”, coming at the tail-end of the piece.
Interestingly, in popular music such a coda is called and “outro”, an obvious reference to the beginning of the piece, which often may have an “intro” or “introduction.”
In jazz, such a coda is called a “tag.”