ICT Glossary – Some Important Terms Related To ICT


1. Data Transfer Rate

The speed at which data can be read from the hard disk and delivered to the processor.

2. Default value

A number of programs will require the user to provide information. In some cases if the user chooses not to enter a value a “default value” will be taken. If for instance you have a database in which you record the names and addresses of all your customers and nearly all of them are based in the UK you can set the database up such that if a country is not entered then it will be defaulted to the UK.

3. DMA (Direct Memory Access)

A DMA channel is used to transmit data at a high speed between an I/O device and the PC’s memory without involving the microprocessor.

4. DMI (Desktop Management Interface)

Software for managing the PC’s within a network from a central PC.

5. Dot Pitch

A measure of the space between pixel’s displayed on the monitor.

6. DPI (Dots per inch)

A  measure of the quality of the output from a printer- the greater the number of DPI the better the printer.

7. DVD (Digital Video Disk)

DVD can hold over 4 gigabytes of information- these are predicted to eventually supersede CD’s.

8. Debugging

It is the process of eliminating errors in a program. Its objective is to detect the cause of error and remove known errors in the program. Debugging is complete when all known errors in the program are fixed. It ends temporarily and restarts whenever new errors are detected in the program.

9. DDL (Data Definition    Language)

A  language   used  to define  the structure  of a database.

10. DTP (Desktop Publishing)

An   application    software package  that enables  a user to perform  design,  typesetting, and   paste-up    functions,    and   to   produce    high-quality, camera-ready   printed  pages  of the documents   so prepared on a high-quality  printer.

11. Disk array

A mass  storage  device  that uses a set of   hard disks,   hard   disk  drives,   and  a  controller   mounted   in  a single   box  forming   a  single   large  storage   unit.     Also known as Redundant  Array of Inexpensive  Disks (RAID).

12. Dumb Terminal

A display monitor that has no processing capabilities. A dumb terminal is simply an output device that accepts data from the CPU. In contrast, a smart terminal is a monitor that has its own processor for special features, such as bold and blinking characters. Dumb terminals are not as fast as smart terminals, and they do not support as many display features, but they are adequate for most applications.

13. DDE (Dynamic Data Exchange)

Technique  for linking applications    to   enable    users   to   move   data   from   one application    to  another   such  as’ from  a  spreadsheet   to  a word-processor.       Changes   made   in  one  application    are reflected  automatically   in linked applications.

14. DRAM (Dynamic RAM)

A type  of  RAM  that  uses  an external   circuitry   to  periodically   “regenerate”    or  refresh the storage  charge  to retain  the stored  data.

15. Dial up line

Also known as switched line service operates like a telephone service. That is, a user of a computer  willing  to communicate   with a remote  computer  first makes  a connection request  by dialing  up the  remote  computer.   A circuit  is then  established   between  the two computers via telephone  company’s   switching  system.  Modems  attached  to the computers  then send and receive data  over  telephone   line.  Like  a  telephone   call,  charge   for  data  transmission   service   in  this  case depends  on duration  of communication (circuit  establishment),  and distance  between  two computers.

16. Downtime

The time interval during which a device is malfunctioning or inoperative.

ICT Glossary – Some Important Terms Related To ICT

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