A single KML file can contain features of different types as well as imagery. KML can also contain related content such as graphics, pictures, attributes, and HTML, whereas datasets in ArcGIS are typically seen as separate and homogeneous elements (for example, point feature classes can only contain points rasters can only contain cells or pixels and not features). KML can be composed of point, line, polygon features, and raster imagery. kmz (for compressed or zipped KML files) file extension. KML is a common format for sharing geographic data with non-GIS users, as it can be easily delivered on the internet and viewed in a number of free applications. Keyhole Markup Language (KML) is an XML-based format for storing geographic data and associated content and is an official Open Geospatial Consortium (OGC) standard.
