.tar — Tape Archive
Archive application/x-tar
What a .tar file is
A container that bundles files and their permissions without compressing anything. Almost always paired with a compressor, giving .tar.gz or .tar.xz.
How to open it
tar -xf archive.tar.gz on any Unix system; 7-Zip on Windows.
Worth knowing
Unlike ZIP, a tar preserves Unix ownership and permission bits — which is why it is still the default for source releases.