If you think hard about this question, you would have already figured it out.
If you have crappy communication skills, then that will lead to conflicts with the other people you have to work with. They will misunderstand what you're trying to tell them or they will not understand what you're asking.
You need to have clear, concise and professional communication skills in the workplace. You want people to understand your questions, if you have them, and you want people to understand your answers when you give them. Otherwise, you will have chaos which is really not good.