Item Meaning
ADSL = Asymmetric Digital Subscriber Line
Bit = 1 or 0 level of storage capacity
BPS = Bits Per Second
Byte = A measurement of storage capacity
CBT = Computer Based Training
CD = Compact Disk
CD-R = Compact Disk – Recordable
CD-ROM= Compact Disk – Read Only Memory
CPU = Central Processing Unit
DAT = Digital Audio Tape
DOS = Disk Operating System
DSL = Digital Subscriber Link
DVD = Digital Versatile Disk
FTP = File Transfer Protocol
GByte = 1Gigabyte = 1024 Megabyte
GHz = Gigahertz: measurement of computer speed
GUI = Graphical User Interface
Hz = Hertz (this is a measurement of frequency e.g: speed)
IS = Information System
ISDN = Integrated Service Digital Network
IT = Information Technology
KByte = 1 Kilobyte = 1024 bytes
LAN = Local Area Network
MByte = 1 Megabyte = 1 million byte
MHz = Million Hertz
PC = Personal Computer
PSTN = Public Switched Telephone Network
RAM = Random Access Memory
ROM = Read Only Memory
ROM-BIOS = ROM-Basic Input Output System
RSI = Repetitive Strain Injury
TByte = Terabyte. 1Tbyte=1milion MB
UPS = Uninterruptible Power Supply
USB = Universal Serial Bus
VDU = Visual Display Unit
WAN = Wide Area Network
WWW = World Wide Web

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Information source: Official Productivity Training Suite