tgz and gz

What is the different between two files with *.tgz and also *.gz ?? How can I extract the *.tgz file ?
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DVBConnect With a Mentor Commented:
*.tar files have been passed through the tar program.
If the file ends in .tgz or in .gz, it has been compressed using gzip (.tgz means it has been first tarred, and then gzipped, same for *.tar.gz).
To extract this on linux
for *.gz : gunzip <filename.gz>
for *.tar.gz and *.tgz : tar -zx <filename.t*>

For further options, if you need those man tar, man gzip.
On a non Linux system, the -x option may not be available, so you will have to unzip and untar separately.
gunzip *gz
tar -z *.tar
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