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'''QGIS''', also isknown aas [[free'''Quantum software|free]]GIS''', andis [[open-source software|open-source]] [[cross-platform]] desktopa [[geographic information system]] (GIS) applicationsoftware that supportsis viewing, editing, printing,[[free and analysis of geospatial dataopen-source]].<ref name="Official Website">{{cite web|title=QGIS Official Website |url=http://www.qgis.org/ |publisher=QGIS |access-date=16 October 2013}}</ref> QGIS supports [[Windows]], [[macOS]], and [[Linux]].<ref>{{Cite web |title=Download QGIS |url=https://www.qgis.org/en/site/forusers/download.html |access-date=2023-12-31 |website=www.qgis.org}}</ref> It supports viewing, editing, printing, and analysis of geospatial data.
==Functionality==
QGIS functions as [[geographic information system]] (GIS) software, allowing users to analyze and edit spatial information, in addition to composing and exporting graphical maps.<ref name="Official Website" /> QGIS supports [[raster graphics|raster]], [[Vector graphics|vector]] and mesh layers. Vector data is stored as either point, line, or [[Polygon (computer graphics)|polygon]] features. Multiple formats of raster images are supported, and the software can [[georeferencing|georeference]] images.
QGIS supports [[shapefile]]s, personal geodatabases, [[dxf]], [[MapInfo Professional|MapInfo]], [[PostGIS]], and other industry-standard formats.<ref>{{cite news |url=http://www.linuxjournal.com/content/getting-started-quantum-gis |title=Getting Started With Quantum GIS |work=Linux Journal |last=Gray |first=James |date=2008-03-26}}</ref> Web services, including [[Web Map Service]] and [[Web Feature Service]], are also supported to allow use of data from external sources.<ref name="Cavallini"/>
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