Because it uses ZIP compression, a KMZ file is significantly smaller—often only 10% the size of the original KML—making it the preferred choice for emailing and sharing.
stands for Keyhole Markup Zipped . A KMZ file is essentially a compressed archive that contains a KML file and all its associated resources. kmz kml file
It stores points (placemarks), lines (paths), and polygons (shapes). Because it uses ZIP compression, a KMZ file