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You have a .kml file — geographic data designed to be displayed on a map. KML (Keyhole Markup Language) was created for Google Earth and is the standard format for sharing map annotations, placemarks, paths, polygons, and overlays. If someone wants to show you where something is on a map, they might send you a KML file.
KML is XML-based and stores geographic features with coordinates, styling information, descriptions, and even time-based animations. The format was originally developed by Keyhole, Inc. (which Google acquired in 2004 to create Google Earth). KMZ is the compressed version — a KML file inside a ZIP archive, often including image overlays and 3D models. Google submitted KML to the Open Geospatial Consortium as a standard in 2008.
Google Earth (free) is the natural viewer for KML files. Google Maps can import simple KML files via My Maps. QGIS (free, open-source) handles KML for serious GIS work. For converting between GPX and KML, GPS Visualizer (free, web-based) handles it instantly.