The command bzip2 is also used to compress a file like gzip command but takes a little more time but compresses better. Its extension will be (.bz2).
Look at the above snapshot, bzip2 command has compressed file 'acb' with extension (.bz2).
The command bunzip2 decompress a file like gunzip command.
Look at the above snapshot, bunzip2 command has decompressed file 'acb.bz2'.