Hello. There's a wire hanging underneath my car that runs from front to back. A lot of readers here now. Really need answers fast? Pictures in other field!

I have a Jeep and there's a wire hanging down. The end is wrapped, but looks like it's supposed to be that way. Not by tape. There's a slight "scratch" with the metal inside the coating exposed. I don't know what this wire is. Is it important? Do I need to reattach it before I can drive?http://ift.tt/2stNqAc http://ift.tt/2tdn8PN via /r/cars http://ift.tt/2ubIPjb