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TAR file format
The TAR file was specifically created in the UNIX sphere to sustain tape backup procedures. The file has been subsequently used to collect multiple files into a single file for distribution or storage and file archiving. TAR can also be said to be an application that can be used to treat TAR files.
TAR file means the collection of files into one, and this compression is usually not by default. Applications like gzip can be used to compress the entire TAR file. Therefore, the file extension is changed from .tar to .tar.gz if the compression is applied. However, the suffix would be based on the type of compression used. TAR files contain approximately 512 bytes and a file header.
Apple Archive Utility
The GNU Project