Different steam wand types?

I got this Rancilio at my job and I noticed both steam wands look like theyre used to do 2 different things? Ive asked my coworkers and they dont know either… Its my first job as a barista so maybe this is completely normal for a barista machine. Can someone explain this probably very basic feature please?

I havent really noticed any difference while making milk for lattes nor cappuccinos.