Masts on Megayachts

Over the past several months of scanning pictures of megayachts I have noticed that some of them have a second mast very near the bow. It is my opinion that this second mast does nothing for the lines of the yacht.

What is the function of this "stand alone" second mast?

Why do some yachts have this and not others or all of them?

Just thought I would ask. Anyone know anything about this subject??