| Term | Description |
| Template | A template is a permanent, ready-to-use document setup, including layout, formatting and formulas that remain the same in each document. Users just have to enter the information that changes. |
| Temporary File | A file that is created by a running application to store temporary information needed for the program. These temporary files should be removed when the Application closes, however sometimes they aren't and have to be removed manually. They often have a .TMP extension. |
| Thread | A single task that is part of a larger task or program. In a newsgroup or forum, a Thread is a statement or question and all responses pertaining to it. |
| TIFF | Tagged Information File Format. This is a common format for saving bit-mapped graphic images. Saving files to this format result in fairly large, uncompressed graphic files with a .tif extension. TIFF is a platform independant format which means it can be read on a PC or a Macintosh. |
| Trace | A wire or electronic pathway on a circuit board. |
| Track | When a disk is low-level formatted, it's divided into concentric circles called tracks. When a disk is spinning, the area directly under the stationary read/write head is a Track. |
| Transistor | An electronic device that can regulate electricity and act as an on/off switch. In a computer, this on/off ability is used to represent binary digits (bits). A CPU contains millions of transistors. |
| Trojan Horse | A malicious program that is written soley to cause damage or disrupt the normal operation of a computer. They usually have a name that makes them appear to be a useful or important program, that tricks a user into starting them. When the user clicks on the file, it releases its payload. |
| TSR | Terminate and Stay Resident program. A program that is loaded into memory but doesn't execute until it recognizes a certain keystroke or event. A screen-saver is a TSR that runs after it recognizes a certain period of inactivity. |
| Turbo Switch | A Turbo Switch is a button on older computers that can toggle between two different clock speeds. When CPUs started to increase dramatically in speed, some older programs (especially games) worked faster than was possible to follow. By clicking the Turbo Switch, you could slow the computer down so that the program was still usable. A Turbo Switch is not normally found on newer computers. |