tar.gz = tgz. the ball part is the compression algorithm. tar.bz2 tar.xz. still tarballs. still common. the slang has sorta faded away, but the principle is the same. unix law. layer processes in the architecture. tar is the filesystem. the ball is the packing.

I've got plenty of tarballs to go around lol https://www.vaughnnugent.com/resources/software/modules/V…