UUCP is an abbreviation of Unix-to-Unix Copy. The term generally refers to a suite of computer programs and protocols allowing remote execution of commands and transfer of files, email and netnews between computers. Specifically, a command named uucp is one of the programs in the suite; it provides a user interface for requesting file copy operations. The UUCP suite also includes uux (user interface for remote command execution), uucico (the communication program that performs the file transfers), uustat (reports statistics on recent activity), uuxqt (execute commands sent from remote machines), and uuname (reports the UUCP name of the local system).
Although UUCP was originally developed on Unix and is most closely associated with Unix-like systems, UUCP implementations exist for several non-Unix-like operating systems, including Microsoft's MS-DOS, Digital's VAX/VMS, Commodore's AmigaOS, classic Mac OS, and even CP/M.
Read more about UUCP: Technology, History, UUCP For Mail Routing, UUCPNET and Mapping, Connections With The Internet, Remote Commands, Decline, Last Uses and Legacy