Tar

creates an archive (Commonly called a tarball. 'tar' is short for 'tape archive')

Flags

   -z use gzip to compress/read the resulting tarball
   
   -j use bzip2 to compress/read the tarball
   
   -c create a new archive.
   
   -v verbose. tar will list all the files it's adding to the archive.
   
   -f the result should be saved into a file (as opposed to being stored on a tape)
   
   -t list the contents of an archive
   

Examples:

Create a new archive:

tar -zvfc mytar.tgz *  creates a tarball named “mytar.tar.gz”, and archives all files in the current directory into it.

Extract from an archive:

tar -zvfx mytar.tgz   Extracts all files in the tarball into the current directory.

List the contents of a tarball:

tar -zvft mytar.tgz

References

1. tar man page
2. Ultimate Tar Command Tutorial