What is GIS?
GIS is short for Geographic Information Systems; it is a computer system that creates, manages, analyzes, and displays geographically referenced information.
Why should I use GIS?
GIS is helps users to better understand patterns and relationships through geographic context which can improve communication and efficiency which are critical to management and decision making. If you the data you're analyzing depends on location or you think there may be insights to gain by visualizing the dataset's geographic positions then you should try using GIS.