Oh come on, this shit is easy. Why did they say "it is" and not "it's", by the way? To put it that way can't help. So yeah, it's a pipe that can suck, and you push it all over your room, to suck the dust and dirt up off the rugs and such, and in fact off of any low down flat part. One kind can even move on its own! But what I want to say here, in the main, is that you math guys have all lost your grip on how to say any idea in an easy form. You are not able to do it any more, 'cos too much math has made you sick in the head.