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GIS = Geographic Information Systems
GIS is a collection of software, data, and people that supports mapping, analysis and decision making. GIS enables you to interact with data spatially in ways that tables, charts and static maps cannot achieve. For further reading, check out Penn State's open GIS textbook: The Nature of Geographic Information.
Here are some examples of what GIS can do:
Here are a few projects and organizations utilizing GIS in their work.
For much more on GIS applications and data, see the Mapping and GIS Guide.