Acronym & Terms
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In this ever fast changing world keeping pace with the technology is itself is a challenge. Here I have tried to explain some of the most commonly used jargons or terminology in the field of Computers.

HARDWARE RELATED

AGP - Accelarated Graphics Port for high speed graphic adventure.
BIOS - Basic Input/Output System.
CMOS - Complementary Metal Oxide Semiconductor
CD-ROM - Compact Disc Read Only Memory is a media which can store upto 650MB of data.
DIMM - Dual Inline Memory Module.
EDO - Extended Data Output.
PDA - Personal Digital Assistant
RAM - Random Access Memory.There are various type of RAM like DRAM where D stands for Dynamic,VRAM where V stands for Virtual, EDO-RAM where EDO stands for Enhanced Data Output,SDRAM where SD stands for Synchronous Dynamic.
WYSIWYG - "What you see is what you get". A word processing or DTP program where what you see on the screen is exactly the same as the image or text that will be printed, including graphics and special fonts.

SOFTWARE RELATED

ASCII - American Standard Code for Information Inter-change.
CAD - Computer Aided-Design.
CMYK - Cyan, Magenta, Yellow and black
CORBA - Common Object Request Broker Architecture
WORM - Write Once Read Many times

File Formats (Extensions)

DLL - Dynamic Linked Library file
DOC - Files made by Microsoft Word
HTML - Hyper Text Markup Language is a series of special code that define the typeface and style that should be used when displaying the text.HTML is used to create documents for the graphical part of the internet, the World Wide Web.
PPT - Files made by Microsoft Powerpoint
TXT - Files made by Notepad
XLS - Files made by Microsoft Excel

Graphics (Extensions)

BMP - Windows Bitmap files.
DXF - AutoCAD's DXF (Drawing Interchange) file format.
EMF - Enhanced Windows Metafiles.
GIF - Graphics Interchange Format is a commonly-used format for storing images and bitmapped colour graphics and was originally developed for the CompuServe online system.
HSI1 - These images are JPEG derivative made by Handmade Software for their Image Alchemy package
IMG - Unix's Image file.
JPEG - Joint Picture Experts Group is a format of storing pictures.
LBM/ILBM - Format used by Deluxe Paint to store bitmap images.
PBM - Image files which are used by DMGraph, an utility to insert new graphics into a DOOM WAD file.
PCX - Picture files createed by ZSoft Paintbrush programs
PGM - Portable GrayMap file format
PIC - PIC files contain images in an uncompressed format
PNG - Portable Network Graphics is a lossless image compression format
PNM - Portable AnyMap file format
PPM - Portable PixMap file format
PSD - Adobe Photoshop file format.
TGA - TARGA image files.
TIFF - Tag Image File Format is a standard file format used to store graphic images (developed by Aldus and Microsoft) that can handle monochrome, grey-scale, 8-bit or 24-bit colour images.

Animation (Extensions)

3DS - 3D Studio file format
ASF - Advanced Streaming Format used either on remote servers or live.
AVI(Audio/Video Interleave) - Standard that describes how video frames and simultaneous sound should be stored in a single file.
CEG - Continous Edge Graphic is a raw picture format used bythe Edsun cards with CEG-chips whic provide some better look through anti-aliasing.
DAT - Digital Audio Tape
GL - GRASP animation files consists of a program to create animations and a run-time environment for displaying them.
FLI - AutoDesk Animator files
MPG - Moving Picture Experts Group is a format for storing video in a compressed format.
QT - Quicktime files.

Archive File Formats (Extensions)

ARC - Archive files created by SEA ARC program.
ARJ - An ARJ program by Robert K. Jung
GZIP - GNU ZIP program is an archive program mostly for the UNIX machines developed by the GNU project.
HA - Archive File Format
HYP - The Hyper archiver is a compression program by P. Sawatzki and K.P. Nischke.
LBR - Archive File Format
LZH - LHArc/LHA archiver is a multi platform archiver made by Haruyasu Yoshizaki.
SQZ - Archive File Format
RAR - Compression file format
TAR - The Unix TAR program is an archiver program which stores files in a single archive without compression.
ZIP - the ZIP archives are created by the programs of PkWare and WinZip company.
ZOO - ZOO archive program by Raoul Dhesi is a file compression program.

Modules File Formats (Extensions)

669 - A module format for digital music.
AMS - A multichannel module format created by the X-Tracker.
AU -
DCM -
DMF -
MID -
MOD -
MP3 - Moving Picture Experts Group is a format for storing audio in a compressed format.
MTM -
RA - Real audio sound files played by Real Player
WAV - Windows' Wave file made by Sound Recorder
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INTERNET/NETWORK RELATED

BBS - Bulletin Board Service.
Chat - Another term for IRC.Also, an acronym meaning Conversational Hypertext Access Technology.
Dialup - A widely used method of accessing the Internet. A dialup connection uses regular phone lines to connect one computer to another via modem.
ISDN - Integrated Services Digital Network is a relatively new technology which combines voice and digital network services in a single medium.
FTP - File Transfer Protocol is the most widely-used way of downloading and uploading (getting and putting) files across an Internet connection. The File Transfer Protocol is a standardized way to connect computers so that files can be shared between them easily. There is a set of commands in FTP for making and changing directories, transferring, copying, moving, and deleting files. Formerly, all FTP connections were text based, but graphical applications are now available that make FTP commands as easy as dragging and dropping. Numerous FTP clients exist for a number of platforms.
NNTP - Network News Transfer Protocol is an industry standard protocol for the distribution, inquiry, retrieval, and posting of news articles.
PING - Packet Internet Gopher is the simplest way to test or time the response of an Internet connection. A PING sends a request to an Internet host and waits for a reply called a PONG. When you PING an address, you get a response telling you the number of seconds it took to make the connection.
POP - Post Office Protocol is protocol designed to allow single users to read mail from a server. There are three versions: POP, POP2, and POP3. When email is sent to you, it is stored on the server until accessed by you. Once you are authenticated, the POP is used to transmit the stored mail from the server to your local mailbox on your client machine.
PPP - Point-to-Point Protocol is a protocol that provides a method for transmitting packets over serial point-to-point links.
SMTP - Simple Mail Transfer Protocol is a protocol used to transfer email. SMTP transfers mail from server to server, and the end user must use POP (see also Post Office Protocol) to transfer the messages to their machine.
SNMP - Simple Network Management Protocol is developed to manage nodes on an IP network, SNMP is an Internet standard protocol. It can be used to manage wiring hubs, video toasters, CD ROM jukeboxes, and many other devices.
TCP/IP - Transmission Control Protocol/Interface Program is a set of standard commands used in networks and the Internet to allow computers to exchange information.
URL - Uniform Resource Locator. Internet system used to standardise the way in which World Wide Web addresses are written.
WAP - Wireless Application Protocol