These files include polygons, points, lines, and pictures. Information about geographic modeling is stored in KML files using an XML format.

Although other mapping programs have been known to use this file format as well, the Google Earth application is currently the main application to use KML files. In 2004, Google purchased the Keyhole business and its software. The KML file format was initially created by Keyhole Inc. KML, or Keyhole Markup Language, stands for. With time, more and more projects, including a number of APIs written in various languages, have emerged that support KML file formats. The format has the distinction of being the first to view and edit KML files because it was created for use with Google Earth. The Open Geospatial Consortium designated KML as an international standard in 2008. KML was initially created for use with Keyhole Earth Viewer, the predecessor to Google Earth. All of the tags are case-sensitive, and it's crucial to use the KML Reference's recommended order. KML makes use of nested elements and attributes in a tag-based structure. KML file format support has become widespread in applications since it was made an international standard. Geographic Information System (GIS) applications can open files saved as KML if they support it. KML (Keyhole Markup Language) is an XML-based format for geospatial data.

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