U
UNIX
A host operating system developed by AT&T that allows multiple clients to access the resources of one host simultaneously. Many of the news, mail, World Wide Web and name servers on the Internet use this operating system.
Upload
The transmission of a file from one computer system to another, usually larger computer system. In terms of web hosting, it would happen when a file is transmitted to the host's web servers.
URL
A Uniform Resource Locator (URL) is a path to a location on the Internet. For instance, http://www.sterlink.net will take you to Sterling's Web Site.
USENET
A worldwide bulletin board system that can be accessed through the Internet or through many online services. The USENET contains more than 14,000 forums, called newsgroups that cover every imaginable interest group. It is used daily by millions of people around the world.
UUCP
Short for Unix-to-Unix Copy, a Unix utility and protocol that enables one computer to send files to another computer over a direct serial connection or via modems and the telephone system. For most file transfer applications, UUCP has been superseded by other protocols, such as FTP, SMTP and NNTP.