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UPS - Uninterruptible Power Supply
Uninterruptible Power Supply: is an instantaneous kick-in system that powers computers for a limited period during a power failure. Provides a breathing space during which data can be saved to disk and computers shutdown properly.

URL - Uniform Resource Locator
A technical term for website addresses.

USB - Universal Serial Bus
USB: A new type of serial port (or connector), faster and more versatile than its predecessors. Used to attach extra devices such as a scanner to a PC. Fitted on new PCs from around 1998. USB 2.0 is a faster version of the same thing.