UUCP即UNIX间复制协议（Unix to Unix Copy Protocol）的缩写，它同时包括一个电脑进程以及一个协议，UUCP允许在未连上Internet的UNIX主机间远程执行命令以及传送文档，email或netnews.UUCP包是由多种进程组成，包括uucp,uuxqt（front ends for remote copy and execution）,uucico（通信进程），uustat，以及uuname.现在已经很少使用Modem来进行通信了，但是有时这个协议仍然在TCP/IP上使用。

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.

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). Some versions of the suite include uuencode/uudecode (convert 8-bit binary files to 7-bit text format and vice versa).