As the Information Systems (IS) traditional, the Geographic Information Systems (GIS) integrates hardware, software, data and human capital. The big difference and advantage of GIS against the SI is the geographical component.
With GIS you can see, understand, investigate, interpret and visualize data in many ways, revealing relationships, patterns and spatial trends, embodied in maps, globes, reports or charts.
A GIS can help you in many ways to answer questions and solve problems, expressing the results in a manner understood and shared easily and quickly.
GIS are Information Systems for Excellence, with great room for improvement and implementation, since all our thinking is organized around geography. The GIS technology can be integrated into multiple information systems of any type of company. (Source: ESRI)