In very broad terms, anytime you have a clearly-defined and recurring process that involves manipulating information you can use an I.S. to automate the most time-consuming parts thereof, cutting costs and leaving most time for your employees to do real creative work.
Technology is one of the few fields of human knowledge to which people of all ideologies and political leanings converge to. It is also a form of art we take part in with pleasure.
There are many ways in which Information Systems have been put into use and here are just a few simple examples to give you a better grasp of what they can accomplish.