KML

Keyhole Markup Language. Its what makes Google Earth cool and exciting.

Most often its found in KMZ (or zipped) versions.

You can open it up in a text editor and its mainly just html and xml.

<?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>
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