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1. What is GIS?

Geographic Information Systems (GIS) is technology in which spatial data in the form of points, lines, and shapes are linked to database attributes displaying all forms of geographically referenced information. Here is Wikipedia's entry on GIS.

2. Why use GIS?

GIS allows us to view, understand, question, interpret and visualize data in many ways that reveal relationships, patterns and trends in the form of maps, globes, reports and charts.

A GIS helps you answer questions and solve problems by looking at your data in a way that is quickly understood and easily shared.