What can GIS do?

What canĀ GIS do? The acronym stands for Geographic Information Systems, but what can we do with a Geographic Information System? I found the following article (thefreedictionary.com) that I think puts it short and sweet:

“1 Location What is at …? The first of these questions seeks to find out what exists at a particular location described in various ways (e.g., place name, post or zip code, or geographic references). Continue reading