GIS (Geographic Information System) is a system of computer software, hardware and data, and personnel to help manipulate, analyze and present information that is tied to a spatial location. Any variable that can be located spatially can be fed into GIS.
According to an estimate over 80% of information used by government has a spatial component The main constituents of GIS are:
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Geography- Spatial location
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Information- visualization of analysis of data
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System- linking software, hardware and data bullet Personnel- a thinking explorer who is key to the power of GIS In simplest way.
GIS is a computer based-tool for mapping and analyzing things that exist and events that happen on Earth. Mapmaking and geographic analysis are not new, but a GIS performs these tasks better and faster than do the old manual methods.