You can use it to make heaps of different types of diagrams and other graphical representations of data. You can do flow charts, data flow diagrams, calenders, building plans (though I'm not sure how useful it is in that area XD), network diagrams, charts and graphs and just basicaly heaps and heaps of diagrams. It’s good because it has lots of templates and objects to help you stick to the official structure/ syntax of pretty much any type of diagram you may be required to make. Or you can just wing it and not, but yeah makes diagrams really simple to do.