Definition:
1) A computer system for capturing, storing, checking, integrating, manipulating, analysing and displaying data related to positions on the Earth’s surface. Typically, a Geographical Information System (or Spatial Information System) is used for handling maps of one kind or another. These might be represented as several different layers where each layer holds data about a particular kind of feature. Each feature is linked to a position on the graphical image of a map.
2) A computer system for storage, analysis and retrieval of information, in which all data are spatially referenced by their geographic coordinates (north, east). In addition to primary data, such as climatic and soil characteristics, a GIS can be used to calculate derived values, such as erosion hazard, forest yield class, or land suitability for specified land-use types. Data are usually derived from maps and derived values can be printed out as maps.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO. 2008. FAO online glossary