There are many useful abbreviations which may help you in future,it will also help you in your competitive exams:
DO READ IT CAREFULLY:
HTTP:Hypertext Transfer Protocol
HTTPS:Hypertext Transfer Protocol Secure
IP:Internet Protocol
URL:Uniform Resource Locator
USB:Universal Serial Bus
VIRUS:Vital Information Resource Under Sezied
3G:3rd Generation
GSM:Global System For Mobile Communication
CDMA:Code Division Multiple Access
UMTS:Universal Mobile Telecommunication System
SIM:Subscriber Identity Module
AVI:Audio Video Interleave
RTS:Real Time Streaming
SIS:Symbian OS Installer File
AMR:Adaptive Multi Rate Codec
JAD:Java Application Descriptor
JAR:Java Archive
3GPP:3rd Generation Partnership Project
3GP:3rd Generation Project
MP3:MPEG Player 3
MP4:MPEG_4 video files
AAC:Advanced Audio Coding
GIF:Graphic Interchangeable Format
BMP:Bitmap
SWF:Shock Wave Flash
WMV:Windows Media Video
WMA:Windows Media Audio
PNG:Portable Network Graphic
DOC:Document(Microsoft corporation)
PDF:Portable Document Format
M3G:Mobile 3D Graphics
M4A:MPEG_4 Audio files
NTH:Nokia Themes
THM:Themes(Sony Erricson)
MMF:Synthetic Music Mobile Application File
NRT:Nokia Ringtone
XMF:Xtensible Music File
WBMP:Wireless Bitmap Image
DVX:DivX video
HTML:Hyper Text Markup Language
WML:Wireless Markup Language
CD:Compact Disk
DVD:Digital Versatile Disk
CRT:Cathode Ray Tube
DAT:Digital Audio Tape
DOS:Disk Operating System
GUI:Graphical User Interface
TCP:Transmission Control Protocol
UPS:Uninterrupted Power supply
HSDPA:High speed Downlink Packet Access
EDGE:Enhanced Data rate for GSM Evolution
VHF:Very High Frequency
UHF: Ultra High Frequency
GPRS: General Packet Radio Service
WAP:Wireless Application Protocol
ARPANET:Advanced Research Project Agency Network
IBM: International Business Machines
HP: Hewlett Packard
AM/FM: Amplitude/Frequency Modulation
LAN: Local Area Network
WLAN: Wireless Local Area Network