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U

Unicasting
Communication between a sender and a single receiver over a network. For example, an email message sent from one person to another.

Author Name: Learning Circuits

Unix
A computer operating system developed by AT&T Bell Labs and used to develop the Internet. It is no longer the sole operating system used to run servers.
Uplink
The communication link from a transmitting earth station to a satellite.

Author Name: Learning Circuits

Upload
Transferring a file or files from the user's computer to a remote computer.
URI (uniform resource identifier)
Name and address of information--text, graphics, audio, video, and so forth--on the Internet. A URI usually identifies the application used to access the resource, the machine the resource is located on, and the file name of the resource. A Webpage address or URL is the most commonly used type of URI.

Author Name: Learning Circuits

URL
Short for Uniform Resource Locator. A string of characters used to uniquely identify a page of information on the WWW. This information is used by browser software to find other WWW, FTP, telnet, gopher, etc. sites on the Internet.
Usability
The measure of how effectively, efficiently, and easily a person can navigate an interface, find information on it, and achieve his or her goals.

Author Name: Learning Circuits