The tar command is used to create archives and extract files and directories from tar archives. You can use tar as an expedient and simple method for storing an entire file system. You can then use the tar file as a backup, or you can transfer and extract the file onto another machine. tar is very useful for generating daily backups of critical files (such as a current project) or for archiving data, such as mail for an entire organization.
tar "flattens" files and directories into sequential archives that can go to tape or disk. Linux supports standard commands for tape backup, including:

Question: What command do you use to create a compressed tar archive named
/project.tar.gz that contains the files and subdirectories in the /project directory?

tar czf /project.tar.gz /project

tar zcf /project.tar.gz /project