Definitions for "TGZ"
Keywords:  gzip, tar, deb, koffice, rpm
It is so common to tar a batch of files and then compress them with gzip that the result is often given the "tgz" extension instead of "tar" and "gz" in sequence.
Files ending in .tar.gz or .tgz are tar-files compressed with the gzip program. This makes the tar files smaller and quicker to download. You can find KOffice source and binary distributions in this format; however, you should not use them if there are special packages for your system and package manager. See RPM, DEB.
UNIX Tar File Zipped