Geographic Information System (GIS), Geography, Part 1
(a technology that manages, analyzes, and provides geographic information)
The geographic information system is an organized collection of computer hardware, software, geographic data, and personnel designed to efficiently capture, store, update, manipulate, analyze, and display all forms of geographically referenced information which can be drawn from different sources, both statistical and mapped.
Geographic information systems are computer programs linking features commonly seen on maps, such as roads, town boundaries, and water bodies, with related information not usually presented on maps, for example, type of road surface, population, type of agriculture, type of vegetation, or water quality information.
The GIS is a unique information system in which individual observations can be spatially referenced to each other.
The geographic information system is a technology that is used to view and analyze data from a geographic perspective. The technology is a piece of an organization's overall information system framework.
The GIS links locations to information, such as people to addresses, buildings to parcels of land, or streets within a network, and layers that information to give a better understanding of how it all interrelates. The user can then choose which layers to combine based on his/her purpose.
There's more information at the Geographic Information System (GIS): IndexA