Unpacking a tar.gz file, Netscape 46.1 to be exact

[Richard Salts]

How do I go about unpacking this program?  I go into terminal . . . and
then what do I do?

It's a tar file.  What is the unpack command for it?

If my tar program isn't up to date, where do I go to get an update?  The
Red Hat website?  And can the tar program I have now unpack the new one
so that I can unpack the new version of Netscape I just downloaded?

Thanks for any pointers

Richard