cab The cabinet file format, shortened CAB, is an archive file format that was developed for the Microsoft Windows operating system. The format supports the lossless family of data compression algorithms as well as embedded digital certificates that facilitate data integrity. Archives created using the CAB format have the filename extension .cab and are recognized by the operating system through the identifying 4 bytes in the header. CAB enjoys support by other Microsoft technologies such as the Setup APIs, Windows Installer and others. In fact, some earlier integrated development environments developed by Microsoft could create setup files that were organized as CAB files.
tar The .tar filename was originally designed to be used as a TApe ARchiver to store entire file systems and files as single files on tape storage medium. It was designed by AT&T in 1979. Today, the format more commonly refers to an archive or collation of multiple files into a single file with the .tar filename extension. The format is an open source file archive format commonly associated with the UNIX tar command however other data compression tools are capable of effectively compressing and/or decompressing files saved with the .tar file format. Doing so typically adds the compression filename extension to the archive file for example .tar.bz2.