Other forms: largos
Music played or sung largo is slow and dignified, giving it a serious or solemn vibe. There isn't a lot of hurried movement between beats in a largo piece, so you probably won't see many eighth or sixteenth notes.
Largo literally means "wide" or "broad" in Italian — but what does "broad" mean in music? It means that performing the music slowly shouldn’t result in a greater focus on the individual notes and chords. Rather, the focus should be on the "big picture" of the music, giving a sense of each musical phrase and its place in the flow of the whole piece. In that way, even though the music is slow, the listener feels swept along on a current of movement.