Unicode.
A standard for sharing information between different programs and computers. Unicode is meant to replace the ASCII standard and includes all the characters represented by the ASCII standard as well as additional characters for displaying languages such as Greek, Hebrew, Arabic, Russian (which uses Cyrillic), Chinese, Japanese, and Korean.
UNIX.
An operating system written by Ken Thompson of Bell Labs which was a slimmed-down version of the earlier Multics system. Traditionally used for mainframe and minicomputer installations, but is now available for micros - many manufacturers have their own version of Unix (e.g. SunOS, Solaris, AIX, HP/UX, IRIX, MACH, Linux).
Upload.
To transfer files from a local computer onto a remote computer, usually to a networked website or FTP site.
USENET USEr NETwork.
A network linking computers together to share; discussion groups, files, pictures and movies.
User ID or username.
This is a unique identification assigned to you by the system administrator or one you make up yourself. It is used to tell the computer who you are, often in place of your name. You can tell anyone your username - it has nothing to do with the security of your work, but it is required by another user if they wish to communicate with you using electronic mail. Your computer has a specific ID, which is its IP address.
Utility.
Software intended to help you fix, tweak, speed up or enhance your system.
Uudecode.
A program that converts a uuencoded file back into a binary file.
Uuencode.
A program that converts a binary file into a form suitable for sending over a network.