Most often the final section of a song that may include slightly or even very different musical material than that which as preceded it. Generally, but not always, the sheet music will indicate "DS al coda", which means return to the DS (Dal segno) sign, which looks like a sideways S with a line through it and two dots on either side on the sheet music, and then follow the music through to the "to coda" sign - which resembles a cross with a circle or the crosshairs of a rifle scope. At that juncture, skip to the coda to conclude the song.