There is no Superhighway, never was, and there may or may not ever be one. What exists is something else, a vast global network of computers sending messages back and forth. Some call this network the Internet, though that is not entirely accurate either. The Internet is only a part of the whole. Many people just say Internet and leave it at that, since the Internet is certainly the area where most of the activity takes place.
Many people just throw up their hands.
A network is two or more computers electronically connected so that they can communicate back and forth. The Internet is made up of an estimated twenty thousand of these computer networks, all networked together, mostly by phone line, linking millions of individual computers and resulting in one big, unruly network of networks. Think for a moment of an enormous lace doily, like the one on the back of my aunt Philomena's Victorian sofa, but this one is draped across the planet, with each knot representing a different computer. Now imagine that the lace doily conceals a billion tiny wires, and these wires can send words or pictures back and forth between the knots at breakneck speed, almost as fast as we can type them in. The Net is a little like a gigantic lace doily that glows.