Following Abbreviations or full forms are very useful to exams like banking,S.S.C. and UPSC .
ASCII - American Standard Code For Information Interchange
ALGOL - Algorithmic Language
AC - Alternate Current
ACPI - Advanced Configuration and Power Interface
ALU - Arithmetic Logical Unit
ANSI - American National Standard Institute
APM - Advanced Power Management
ASIC - Application Specific Integrated Circuit
ABC - Atanasoff Berry Computer
ATM - Asynchronous Transfer Mode
BBS - Bulletin Board System
BCC - Block Character Check
BNC - Boyonet Nut Connector
BIOS - Basic Input/Output System
BSC - Binary Synchronous Communication
BCD - Binary Coded Decimal
BCC - Blind Carbon Copy
BASIC - Beginners All Purpose Symbolic Instruction Code
CAD - Computer Aided Design
CAM - Computer Aided Manufacturing
CDROM - Compact Disk Read Only Memory
CGA - Color Graphics Array
CMOS - Complementary Metal Oxide Semiconductor
CPU - Central Processing Unit
CPI - Clock Per Instruction
CRC - Cyclic Redundancy Check
CRT - Cathode Ray Tube
CSS - Cascading Style Sheet
CC - Carbon Copy
CAN - Campus Area Network
DEC - Digital Equipment Corporation
DRAM - Dynamic Random Access Memory
DAT - Digital Audio Tape
DC - Direct Current
DD - Double Density
DDR - Double Data Rate
DMA - Direct Memory Access
DOS - Disk Operating System
DTR - Data Terminal Ready
DML - Data Maipulation Language
DDL - Data Definition Language
DCL - Data Control Language
DBMS - Database Management System
DSL - Digital Subscriber Line
DBA - Data Base Administrator
DFD - Data Flow Diagram
EBCDIC - Extended Binary Coded Decimal Interchange Code
EC - Error Check
ECC - Error Check And Correction
EOF - End Of File
EOL - End Of Line
EPP - Enhanced Parallel Port
ESD - Electro-Static Discharge
ESCD - Extended System Configuration Data
FAT - File Allocation Table
FCC - Federal Communication Commission
FDD - Floppy Disk Drive
FDDI - Fiber Distributed Data Interface
FDM - Frequency Divison Multiplexing
FDX - Full-Duplex Transmission
FE - Front End
FIFO - First-In First-Out
FILO - First-In Last-Out
FM - Frequency Modulation
FTP - File Transfer Protocol
GUI - Graphical User Interface
GIF - Graphics Interchange Format
GPRS - General Packet Radio service
GSM - Global System For Mobile
HDD - Hard Disk Drive
HPFS - High Performance File System
HDX - Half-Duplex Transmission
HREF - Hyper Reference
HTTP - Hyper Text Transfer Protocol
HTTPS - Hyper Text Transfer Protocol Secure
HTML - Hypertext Markup Language
I/O - Input/Output
IBM - International Business Machine
IMP - Interface Message Processor
IPC - Inter Process Communication
IRQ - Interrupt Request
ISDN - Integrated Services Digital Network
ISO - International Standard Organization
IC - Integrated Circuit
LAN - Local Area Network
LCD - Liquid Crystal Display
LED - Light Emitting Diode
LSI - Large Scale Integration
LSB - Least Significant Bit
LUN - Logical Unit Number
MAN - Metropolitan Area Network
MB/Mb - Mega Byte/mega bit
MBR - Master Boot Record
MICR - Magnetic Ink Character Recognition
MCGA - Multi Color Graphics Array
MIMD - Multiple-Instruction Multiple Data
MIPS - Millions Instruction Per Second
MISD - Multiple Instruction Single Data
MODEM - Modulator-Demodulator
MOPS - Millions Of Operations Per Second
MOS - Metal Oxide Semiconductor
MS - Microsoft
MSI - Medium Scale Integration
MIME - Multipurpose Internet Mail Extension
NVRAM - Non-Volatile Random Access memory
NT - New Technology
NTFS - New Technology File System
OCR - Optical Character Recognition
OMR - Optical Mark Reader
ODI - Open Data Link Interface
OS - Operating System
OSF - Open System Interconnect
OSI - Open System Interconnection
OEM - Original Equipment Manufacturer
PB - Peta Byte
PC - Personal Computer
PCB - Printed Circuit Board
PCI - Peripheral Component Interconnect
PMOS - Positively Doped Metal Oxide Semiconductor
PNP - Plug-and-Play
POST - Power On self Test
PPP - Point-To-Point protocol
PSTN - Public Switched Telephone network
PNG - Portable Network Graphics
PDA - Personal Digital Assistant
RAID - Redundant Array of Inexpensive Disk
RISC - Reduced Instructions Set Computer
RMS - Root Mean Squared
RPC - Remote Procedure Call
RTC - Real Time Clock
RTS - Request To Send
RDBMS - Relational Database Management System
RAR - Roshal Archieve
SIM - Subscriber Identity Module
SCSI - Small Computer System Interface
SDRAM - Synchronous Dynamic Random Access Memory
SIMM - Single Inline Memory Module
SMT - Surface Mount Technology
STDM - Synchronous Time Divison Multiplexing
SMD - Surface Mount Device
TCP/IP - Transmission Control Protocol/Internet Protocol
TDMA - Time Divison Multiple Access
TFT - Thin Film Transistor
TRANSISTOR - TRANSformer resISTOR
TTL - Transistor-Transistor Logic
TIF - Transferred Image File
TIFF - Tagged Image File Format
TCL - Transaction Control Language
TI - Texas Instrument
UDP - User Datagram protocol
UDDI - Universal Description Discovery and Integration
UPS - Uniterrupted Power Supply
USB - Universal Serial Bus
ULSI - Ultra Large Scale Integration
UTP - Unshielded Twisted pair
VBE - Video BIOS Extension
VCR - Vodeo Cassette Recorder
VESA - Video Enhanced Standards Association
VGA - Video Graphics Array
VLSI - Very Large Scale Integration
VIRUS - Vital Information Resources Under Siege
VPN - Virtual Private Network
WAN - Wide Area Network
WORM - Write Once Read Many
WMAP - Wireless Message Access Protocol
WI-FI - Wireless-Fidelity
WIMAX - World Wide Interoperability For Microwave Access
SQL - Structured Query Language
STP - Shielded Twisted Pair
SAN - Storage Area Network
SMTP - Simple Mail Transfer Protocol
SNMP - Simple Network Mangement Protocol
SDSL - Symmetric Digital Subscriber Line
SDLC - Software Development Life Cycle
XGA - Extended Graphics Array
XOR - Exclusive-OR
XMS - Extended Memory Specification
XT - Extended Technlogy
ZIF - Zero Insertion Force