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UDP

User Datagram Protocol - part of the IP protocol - based on messages - less reliable than TCP but better suited to real time data such as VoIP.

URL

specifies where to find an identified resource

URL - The Uniform Resource Locator  (often a website address) the URL specifies where to find an identified resource.

USA PATRIOT Act

Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism ACT OF 2001.

Enacted in the United States in 2001 following the tragic events of 9/11, this act allows the American government to monitor and record any and all information that passes through American networks.

user interface

The means in which a person controls a software application or hardware device.

Also called a "UI" or simply an "interface" is the means in which a person controls a software application or hardware device. A good user interface provides a "user-friendly" experience, allowing the user to interact with the software or hardware in a natural and intuitive way.