A network map.
Another business diagram that you can make with Visio Professional is a network diagram. You can make a simple diagram or a very detailed one. A small portion of a detailed network diagram is shown here.
Of course, the shapes for the computers, servers, and so on are already made in Visio. Just think what a pain it would be if you had to draw those yourself.
In addition, if you add custom properties to each shape (like asset number, network address, computer name), you can then run detailed inventory reports—right within Visio.