Keyhole Markup Language

notation for expressing geographic annotation and visualization within Internet-based maps

Keyhole Markup Language is a file format for displaying data on maps.

In the same way that a Web browser displays web pages written with HTML, KML draws data on maps like Google Maps and virtual globes like Google Earth.

It is an international standard [1], maintained by the Open Geospatial Consortium [2].

Google, the previous maintainers of the specification, have information on writing KML on their website.