KML/KMZ (Format)

Keyhole Markup Language (KML) is a file format developed by Google after its acquisition of the Keyhole company, used to store its geographic data on Google Maps and Google Earth. It became an international standard format of the Open Geospatial Consortium (OGC). This is a type of language tag, inspired by XML, which incorporates in an ASCII (text) file the geometric descriptions of points, lines and polygons, as well as attribute data. KML files are often distributed in a compressed form, which then take the KMZ extension (KMZip). Example (source Wikipedia):

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<Placemark>
  <name>New York City</name>
  <description>New York City</description>
  <Point>
    <coordinates>-74.006393,40.714172,0</coordinates>
  </Point>
</Placemark>
</Document>
</kml>