A Geographic Information System (GIS) allows professional cartographers and novices alike 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. GIS helps users answer questions and solve problems by looking at data in a way that is quickly understood and easily shared. In a GIS, data is separated into various layers. This allows for layers to be combined on maps or in analysis as needed. For example, a simple street index map is very useful on its own, but by adding a single layer, such as voting precincts, and now you have a tool for identifying the voting precinct and location for any given street in Town, in an easy-to-use format.