This text describes the communications and file transfer program UUCP. UUCP is regaining its popularity among computer users because it works efficiently on the PC-sized computers most people use today. UUCP is very attractive to computer users with limited resources, a small machine, and a dial-up connection. In addition to Taylor UUCP, the text covers the latest versions of HoneyDanBer UUCP, sometimes called Basic Network Utilities, or BNU. It also describes the specific implementation details of UUCP versions by major UNIX vendors.