The .gz file extension is given to Gnu Zipped file archives. This file format was developed by the Gnu Project for use on Unix operating systems in order to compress large files. For example, if you have a file that you would like to send via email, the GZ file format would allow you to compress it into a much smaller file.
GZ archive files are compressed using the GNU (Gzip) compression algorithm. The .gz files can contain one file only. If you want to include multiple files in a GZ file, you need to "combine" them using an archive tool like TAR first. That will create a .tar.gz or .tgz file.
GZ files can be opened on both Mac and Windows operating systems. They can also be opened on computers that are running Linux.
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