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Glossary of Internet and Computer Terms


Below, you will find a comprehensive glossary of Internet and Computer terms with definitions that are helpful and easy to understand. To find a term, click the letter of which the word begins with and scroll alphabetically to find your term. For example, to find the definition for the word "Media", click the letter "M", then scroll the list alphabetically until you find "Media".




  • UDMA:
    A protocol developed by Quantum Corporation and Intel that supports burst mode data transfer rates of 33.3 MBps. This is twice as fast as the previous disk drive standard for PCs, and is necessary to take advantage of new, faster Ultra ATA disk drives.

    The official name for the protocol is Ultra DMA/33. It's also called UDMA, UDMA/33 and DMA mode 33.

  • UNIX:
    This is an operating system developed by AT&T. It's big push it that it allows one server to service many different end users at one time.

  • Uploading:
    The process of transferring files from a local computer to a remote computer, network or Web server. The usual method of uploading files is done using a File Transfer Protocol (FTP) Utility.

  • UPS:
    Uninterruptible Power Supply. A backup power unit that provides continuous power when the normal power supply is interrupted. UPS systems can be stand-by, only supplying power when the regular supply is interrupted, or fulltime, relying on regular power and/or batteries to supply it while it supplies power to the protected device. A UPS is not necessary on most computer systems, but can be important on systems that need to be up 24 hours a day, such as servers. 

  • Upstream:
    The data flowing from the Cable Modem to the CMTS.

  • Upstream frequency:
    The frequency used to transmit data from the CM to the CMTS. Normally in the 5-42 MHz range for US systems and 5-65 MHz for European systems.

  • URL:
    Stands for Universal Resource Locator. It's a fancy way of saying Internet Address.

  • USB:
    Short for Universal Serial Bus, a new external bus standard that supports data transfer rates of 12 MBps (12 million bytes per second). A single USB port can be used to connect up to 128 peripheral devices, such as mice, modems, and keyboards. USB also supports Plug-and-Play installation and hot plugging.

    Starting in 1996, a few computer manufacturers started including USB support in their new machines. Since the release of Intel's 440LX chipset in 1997, USB has become more widespread. It is expected to eventually completely replace serial and parallel ports.

  • User:
    Someone attached to a server or host.

  • Utility Program:
    A program developed to run within an Operating System to perform a specific service.

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