A Al – Artificial intelligence ALGOL – Algorithmic Language ARP – Address resolution Protocol ASCII – American Standard Code for Information Interchange B BINAC - Binary Automatic Computer BCC – Blind Carbon Copy Bin – Binary BASIC - Beginner’s All-purpose Symbolic Instruction Code BIOS – Basic Input Output System Bit – Binary Digit BSNL – Bharat Sanchar Nigam Limited C CC – Carbon Copy CAD – Computer Aided Design COBOL – Common Business Oriented Language CD – Compact Disc CRT – Cathode Ray Tube CDR – Compact Disc Recordable CDROM – Compact Disc Read Only Memory CDRW – Compact Disc Rewritable CDR/W – Compact Disk Read/Write D DBA – Data Base Administrator DBMS – Data Base Management System DNS – Domain Name System DPI – Dots Per Inch DRAM – Dynamic Random Access Memory DVD – Digital Video Disc/Digital Versatile Disc DVDR – DVD Recordable DVDROM – DVD Read Only Memory DVDRW – DVD Rewritable DVR – Digital Video Recorder DOS – Disk Operating System E EBCDIC – Extended Binary Coded Decimal Interchange Code e-Commerce – Electronic Commerce EDP – Electronic Data Processing EEPROM – Electrically Erasable Programmable Read Only Memory ELM/e-Mail – Electronic Mail ENIAC - Electronic Numerical Integrator and Computer EOF - End Of File EPROM - Erasable Programmable Read Only Memory EXE - Executable F FAX - Far Away Xerox/ facsimile FDC - Floppy Disk Controller FDD - Floppy Disk Drive FORTRAN - Formula Translation FS - File System FTP - File Transfer Protocol G Gb - Gigabit GB - Gigabyte GIF - Graphics Interchange Format GSM - Global System for Mobile Communication H HDD - Hard Disk Drive HP - Hewlett Packard HTML - Hyper Text Markup Language HTTP - Hyper Text Transfer Protocol I IBM - International Business Machine IM - Instant Message IMAP - Internet Message Access Protocol ISP - Internet Service Provider J JPEG - Joint Photographic Experts Group K Kb - Kilobit KB - Kilobyte KHz - Kilohertz Kbps - Kilobit Per Second L LCD – Liquid Crystal Display LED – Light Emitting Diode LPI – Lines Per Inch LIS – Large Scale Integration M Mb – Megabit MB – Megabyte MPEG – Moving Picture Experts Group MMS – Multimedia Message Service MICR – Magnetic Ink Character reader MIPS – Million Instructions Per Second N NIC – Network Interface Card NOS – Network Operating System O OMR – Optical Mark Reader OOP – Object Oriented Programming OSS – Open Source Software P PAN – Personal Area Network PC – Personal Computer PDA - Personal Digital Assistant PDF – Portable Document Format POS – Point Of Sale PNG - Portable Network Graphics PPM – Pages Per Minute PPP – Point-to-Point Protocol PROM – Programmable Read Only Memory PSTN – Public Switched Telephone Network POST – Power On Self Test PING – Packet Internet Gopher R RAM – Random Access Memory RDBMS – Relational Data Base Management System RIP – Routing Information Protocol RTF – Rich Text Format S SMTP – Simple Mail Transfer Protocol SQL – Structured Query Language SRAM – Static Random Access Memory SNMP – Simple Network Management Protocol SIM – Subscriber Identification Module T TCP – Transmission Control Protocol TB – Tera Bytes U UPS – Uninterrupted Power Supply URI – Uniform Resource Identifier URL – Uniform Resource Locator USB - Universal Serial Bus ULSI - Ultra Large Scale Integration UNIVAC - Universal Automatic Computer V VAR – Variable VGA – Video Graphics Array VSNL – Videsh Sanchar Nigam Limited VDU – Visual Display Unit W Wi-Fi – Wireless Fidelity WLAN – Wireless Local Area Network WPA – Wi-Fi Protected Access WWW – World Wide Web WORM – Write Once Read Many X XHTML – eXtensible Hyper text Markup Language XML - eXtensible Markup language Z ZB – Zeta Byte Some other Important Abbreviations - OCR - Optical Character Readers ODBC - Open Data Base Connectivity OLE - Object Linking And Embedding OMR - Optical Mark Reader ONE - Open Network Architecture OOA - Object Orient Analysis OOAD - Object Oriented Analysis And Design OOP - Object Oriented Programming OOPS - Object Oriented Programming System OPEN GL - Open Graphics Library OS - Operating System OSI - Open System Interconnection PC - Personal Computer PCI - Peripheral Component Interconnect PCMCIA - Personal Computer Memory Card International Association PDA - Personal Digital Assistant PDF - Portable Document Format PDL - Page Description Language PDU - Protocol Data Unit PIC - Programming Interrupt Control PILOT - Programmed Inquiry Learning Or Teaching PLA - Programmable Logic Array PLC - Programmable Logic Controller PNG - Portable Network Graphics PNP - Plug And Play PPP - Peer To Peer Protocol PPTP - Point To Point Tunneling Protocol PROM - Programmable Read Only Memory PS - Post Script RADSL - Rate Adaptive Digital Subscribes Line RAID - Redundant Array Of Independent Disks RAM - Random Access Memory RAMDAC - Random Access Memory Digital To Analog Converter RAS - Remote Access Network RD RAM - Rambus Dynamic Random Access Memory RDBMS - Relational Data Base Management System RDO - Remote Data Objects RDP - Remote Desktop Protocol RFC - Request For Comments RGB - Red Green Blue RICS - Reduced Instruction Set Computer RIP - Raster Image Processor RISC - Reduced Instruction Set Computer ROM - Read Only Memory RPC - Remote Procedure Call RTC - Real Time Clock RTF - Rich Text Format RTOS - Real Time Operating System SACK - Selective Acknowledgements SAM - Security Access Manager SAP - Service Access Point, Systems ApplicationsProducts SCMP - Software Configuration Management Plan SD RAM - Synchronous Dynamic Random AccessMemory SDD - Software Design Description SDK - Software Development Kit SDL - Storage Definition Language SDN - Integrated Service Digital Network SDSL - Symmetric Digital Subscribes Line SG RAM - Synchronous Graphics Random AccessMemory SGML - Standard Generalized Markup Language SIM - Subscriber Identification Module SIMD - Single Instruction Multiple Data SISD - Single Instruction Single Data SIU - Serial Interface Unit SMP - Symmetric MultiProcess SMS - Short Message Service SMTP - Simple Mail Transfer Protocol SNA - System Network Architecture SNAP - Sub Network Access Protoco lSNMP - Simple Network Management Protocol SNOBOL - String Oriented Symbolic Language SOAP - Simple Object Access Protocol SPX - Sequenced Packet Exchange SQA - Statistical Quality Assurance SQL - Structured Query Language SRAM - Static Random Access Memory SRS - Software Requirements Specification STP - Shielded Twisted Pair SVVP - Software Verification And Validation Plan SW - Software TAPI - Telephony Application Program Interface TB - Tera Bytes TCP - Transmission Control Protocol TCPIP - Transmission Control Protocol InternetProtocol TDI - Transport Data Interface TDMA - Time Division Multiple Access TPM - Transactions Processing Monitor TSR - Terminate And Stay Residents UDD - User Datagram Protocol UDP - User Datagram Protocol UI - User Interface UML - Unified Modelling Language UNC - Universal Naming Convention UNIX - Uniplexed Information And ComputerSystems URL - Universal Resource Locator USB - Universal Serial Bus USRT - Universal Synchronous ReceiverTransmitted UTP -Unshielded Twisted Pair VAN - Virtual Area Network VAST - Very Small Aperture Terminal VB - Visual Basic VC++ - Visual C++ VCD - Video Compact Disc VDL - View Definition Language VGA - Video Graphics Array VHS - Video Home System VLIW - Very Long Instruction Words VLSI - Very Large Scale Integrated Circuits VPN - Virtual Private Network VRAM - Video Random Access Memory VRML - Virtual Reality Modelling Language VS - Visual Studio VVR - Software Validation And Validation Report VXD - Virtual Device Driver W3C - World Wide Web Consortium WAIS - Wide Area Information Servers WAN - Wide Area Network WAP - Wireless Application Protocol WBEM - WebBase Enterprise Management WDM - Wave Division Multiplexing

A

• Al – Artificial intelligence
• ALGOL – Algorithmic Language
• ARP – Address resolution Protocol
• ASCII – American Standard Code for Information Interchange

B

• BINAC  - Binary Automatic Computer
• BCC – Blind Carbon Copy
• Bin – Binary
• BASIC - Beginner’s All-purpose Symbolic Instruction Code
• BIOS – Basic Input Output System
• Bit – Binary Digit
• BSNL – Bharat Sanchar Nigam Limited

C

• CC – Carbon Copy
• CAD – Computer Aided Design
• COBOL – Common Business Oriented Language
• CD – Compact Disc
• CRT – Cathode Ray Tube 
• CDR – Compact Disc Recordable
• CDROM – Compact Disc Read Only Memory 
• CDRW – Compact Disc Rewritable
• CDR/W – Compact Disk Read/Write

D

• DBA – Data Base Administrator
• DBMS – Data Base Management System 
• DNS – Domain Name System
• DPI – Dots Per Inch
• DRAM – Dynamic Random Access Memory
• DVD – Digital Video Disc/Digital Versatile Disc
• DVDR – DVD Recordable
• DVDROM – DVD Read Only Memory
• DVDRW – DVD Rewritable
• DVR – Digital Video Recorder
• DOS – Disk Operating System

E

• EBCDIC – Extended Binary Coded Decimal Interchange Code
• e-Commerce – Electronic Commerce
• EDP – Electronic Data Processing
• EEPROM – Electrically Erasable Programmable Read Only Memory
• ELM/e-Mail – Electronic Mail
• ENIAC - Electronic Numerical Integrator and Computer 
• EOF - End Of File 
• EPROM - Erasable Programmable Read Only Memory 
• EXE - Executable 

F

• FAX - Far Away Xerox/ facsimile
• FDC - Floppy Disk Controller 
• FDD - Floppy Disk Drive 
• FORTRAN - Formula Translation 
• FS - File System 
• FTP - File Transfer Protocol

G

• Gb - Gigabit 
• GB - Gigabyte 
• GIF - Graphics Interchange Format 
• GSM -  Global System for Mobile Communication

H

• HDD - Hard Disk Drive 
• HP - Hewlett Packard
• HTML - Hyper Text Markup Language 
• HTTP - Hyper Text Transfer Protocol

I

• IBM - International Business Machine 
• IM - Instant Message
• IMAP - Internet Message Access Protocol 
• ISP - Internet Service Provider

J

• JPEG - Joint Photographic Experts Group

K

• Kb - Kilobit 
• KB - Kilobyte 
• KHz - Kilohertz 
• Kbps - Kilobit Per Second

L

• LCD – Liquid Crystal Display
• LED – Light Emitting Diode
• LPI – Lines Per Inch
• LIS – Large Scale Integration

M

• Mb – Megabit
• MB – Megabyte
• MPEG – Moving Picture Experts Group
• MMS – Multimedia Message Service
• MICR – Magnetic Ink Character reader
• MIPS – Million Instructions Per Second

N

• NIC – Network Interface Card
• NOS – Network Operating System

O

• OMR – Optical Mark Reader
• OOP – Object Oriented Programming
• OSS – Open Source Software

P

• PAN – Personal Area Network
• PC – Personal Computer
• PDA - Personal Digital Assistant
• PDF – Portable Document Format
• POS – Point Of Sale
• PNG - Portable Network Graphics
• PPM – Pages Per Minute
• PPP – Point-to-Point Protocol
• PROM – Programmable Read Only Memory
• PSTN – Public Switched Telephone Network
• POST – Power On Self Test
• PING – Packet Internet Gopher

R

• RAM – Random Access Memory
• RDBMS – Relational Data Base Management System
• RIP – Routing Information Protocol
• RTF – Rich Text Format

S

• SMTP – Simple Mail Transfer Protocol
• SQL – Structured Query Language
• SRAM – Static Random Access Memory
• SNMP – Simple Network Management Protocol
• SIM – Subscriber Identification Module

T

• TCP – Transmission Control Protocol
• TB – Tera Bytes

U

• UPS – Uninterrupted Power Supply
• URI – Uniform Resource Identifier
• URL – Uniform Resource Locator
• USB -  Universal Serial Bus 
• ULSI - Ultra Large Scale Integration
• UNIVAC - Universal Automatic Computer

V

• VAR – Variable
• VGA – Video Graphics Array
• VSNL – Videsh Sanchar Nigam Limited
• VDU – Visual Display Unit

W

• Wi-Fi – Wireless Fidelity
• WLAN – Wireless Local Area Network
• WPA – Wi-Fi Protected Access
• WWW – World Wide Web
• WORM – Write Once Read Many

X

• XHTML – eXtensible Hyper text Markup Language
• XML -  eXtensible Markup language

Z

• ZB – Zeta Byte

Some other Important Abbreviations - 

• OCR - Optical Character Readers
• ODBC - Open Data Base Connectivity
• OLE - Object Linking And Embedding
• OMR - Optical Mark Reader
• ONE - Open Network Architecture
• OOA - Object Orient Analysis
• OOAD - Object Oriented Analysis And Design
• OOP - Object Oriented Programming
• OOPS - Object Oriented Programming System
• OPEN GL - Open Graphics Library
• OS - Operating System
• OSI - Open System Interconnection
• PC - Personal Computer
• PCI - Peripheral Component Interconnect
• PCMCIA - Personal Computer Memory Card International Association
• PDA - Personal Digital Assistant
• PDF - Portable Document Format
• PDL - Page Description Language
• PDU - Protocol Data Unit
• PIC - Programming Interrupt Control
• PILOT - Programmed Inquiry Learning Or Teaching
• PLA - Programmable Logic Array
• PLC - Programmable Logic Controller
• PNG - Portable Network Graphics
• PNP - Plug And Play
• PPP - Peer To Peer Protocol
• PPTP - Point To Point Tunneling Protocol
• PROM - Programmable Read Only Memory
• PS - Post Script
• RADSL - Rate Adaptive Digital Subscribes Line
• RAID - Redundant Array Of Independent Disks
• RAM - Random Access Memory
• RAMDAC - Random Access Memory Digital To Analog Converter
• RAS - Remote Access Network
• RD RAM - Rambus Dynamic Random Access Memory
• RDBMS - Relational Data Base Management System
• RDO - Remote Data Objects
• RDP - Remote Desktop Protocol
• RFC - Request For Comments
• RGB - Red Green Blue
• RICS - Reduced Instruction Set Computer
• RIP - Raster Image Processor
• RISC - Reduced Instruction Set Computer
• ROM - Read Only Memory
• RPC - Remote Procedure Call
• RTC - Real Time Clock
• RTF - Rich Text Format
• RTOS - Real Time Operating System
• SACK  - Selective Acknowledgements
• SAM - Security Access Manager
• SAP - Service Access Point, Systems ApplicationsProducts
• SCMP -  Software Configuration Management Plan
• SD RAM - Synchronous Dynamic Random AccessMemory
• SDD  - Software Design Description
• SDK - Software Development Kit
• SDL - Storage Definition Language
• SDN - Integrated Service Digital Network
• SDSL - Symmetric Digital Subscribes Line
• SG RAM - Synchronous Graphics Random AccessMemory
• SGML - Standard Generalized Markup Language
• SIM - Subscriber Identification Module
• SIMD - Single Instruction Multiple Data
• SISD - Single Instruction Single Data
• SIU - Serial Interface Unit
• SMP - Symmetric MultiProcess
• SMS - Short Message Service
• SMTP - Simple Mail Transfer Protocol
• SNA - System Network Architecture
• SNAP - Sub Network Access Protoco
• lSNMP - Simple Network Management Protocol
• SNOBOL - String Oriented Symbolic Language
• SOAP - Simple Object Access Protocol
• SPX - Sequenced Packet Exchange
• SQA - Statistical Quality Assurance
• SQL - Structured Query Language
• SRAM - Static Random Access Memory
• SRS - Software Requirements Specification
• STP - Shielded Twisted Pair
• SVVP - Software Verification And Validation Plan
• SW - Software
• TAPI - Telephony Application Program Interface
• TB - Tera Bytes
• TCP - Transmission Control Protocol
• TCPIP - Transmission Control Protocol InternetProtocol
• TDI - Transport Data Interface
• TDMA - Time Division Multiple Access
• TPM - Transactions Processing Monitor
• TSR - Terminate And Stay Residents
• UDD - User Datagram Protocol
• UDP - User Datagram Protocol
• UI - User Interface
• UML - Unified Modelling Language
• UNC - Universal Naming Convention
• UNIX - Uniplexed Information And ComputerSystems
• URL - Universal Resource Locator
• USB - Universal Serial Bus
• USRT - Universal Synchronous ReceiverTransmitted
• UTP  -Unshielded Twisted Pair
• VAN - Virtual Area Network
• VAST - Very Small Aperture Terminal
• VB - Visual Basic
• VC++ - Visual C++
• VCD - Video Compact Disc
• VDL - View Definition Language
• VGA - Video Graphics Array
• VHS - Video Home System
• VLIW - Very Long Instruction Words
• VLSI - Very Large Scale Integrated Circuits
• VPN - Virtual Private Network
• VRAM - Video Random Access Memory
• VRML - Virtual Reality Modelling Language
• VS - Visual Studio
• VVR - Software Validation And Validation Report
• VXD - Virtual Device Driver
• W3C - World Wide Web Consortium
• WAIS - Wide Area Information Servers
• WAN - Wide Area Network
• WAP - Wireless Application Protocol
• WBEM - WebBase Enterprise Management
• WDM - Wave Division Multiplexing