Geographic Information System:
Geographic Information System (GIS) is a computer system capable of assembling, manipulating, storing, and displaying geographically referenced information by integrating databases, optimizing data layering or timely data updates. In the context of power distribution, GIS is a digital representation of the geo-coordinates of customers, network elements and significant landmarks on the relevant area's geographical map having appropriate resolution, along with their attributes.
GIS essentially has five elements: Hardware, software, data, people and methods.
Figure: Various Components of GIS