| U | U is the standard unit of measurement for rack-mounted equipment. Racks can be... |
| UDDI | Stands for "Universal Description Discovery and Integration." UDDI is a protocol... |
| UDP | Stands for "User Datagram Protocol." It is part of the TCP/IP suite of protocols... |
| Ultra DMA | This technology for transferring data between a computer's hard disk and memory was... |
| UML | Stands for "Unified Modeling Language." This is a programming language that is... |
| UNC | Stands for "Universal Naming Convention," not just the home of the North Carolina... |
| Undo | The Undo command is located in the Edit menu of most programs and has the shortcut... |
| Unfriend | When you unfriend a user, your remove that person from your list of friends on a... |
| Unix | Also known as UNIX, though the letters do not stand for anything. The Unix... |
| Unmount | Unmounting a disk makes it inaccessible by the computer. Of course, in order for a... |
| Upload | While downloading is receiving a file from another computer, uploading is the exact... |
| UPnP | Stands for "Universal Plug and Play." Plug and Play describes devices that work... |
| UPS | Stands for "Uninterruptible Power Supply." In the technology world, UPS is more... |
| URI | Stands for "Uniform Resource Identifier." A URI identifies the name and location... |
| URL | Stands for "Uniform Resource Locator." A URL is the address of a specific Web site... |
| USB | Stands for "Universal Serial Bus." USB is the most common type of computer port... |
| User Interface | A user interface is the means in which a user controls a software program or... |
| Username | A username is a name that uniquely identifies someone on a computer system. For... |
| Utility | Utility programs, commonly referred to as just "utilities," are software programs... |
