KMZ (Keyhole Markup Language Zipped) is a compressed version of the KML (Keyhole Markup Language) file format. KML is an XML-based language used to represent geographic annotations and visualizations within Internet-based maps and Earth browsers. KMZ files package a KML file along with any supporting files, such as images, icons, models, textures, and other resources, into a single, easily distributable archive. This compression and packaging make it easier to share complex geographic data sets. The KMZ format uses the ZIP compression algorithm to reduce the file size, making it more efficient for transmission and storage. When a KMZ file is opened, the application unzips the archive and accesses the KML file and its associated resources. KMZ files are commonly used for sharing custom maps, geographic data overlays, and 3D models within applications like Google Earth and other GIS (Geographic Information System) software.