KMZ files are KML files that have been compressed or "zipped" for easier download and distribution. Files with the .kmz extension store the locations of the maps that are used by the Google Earth mapping application.
Sometimes a KMZ file will include 3-D model data that has been exported from an SKP file. When this happens, the model is placed on the map to give users an idea of what the building will look like in that specific area.
The Google Earth application is a mapping application that offers users a bird's-eye view of recorded locations across the globe.
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If you have additional information about the KMZ file format or software that uses files with the KMZ suffix, please do get in touch - we would love hearing from you.