Here are some full form these are generally used in computer & IT terms.

ALU – Arithmetic Logic Unit

AMD – Advanced Micro Devices

ASCII – American Standard Code for Information Interchange

BIOS – Basic Input Output System

CD – Compact Disk

CDMA – Code Division Multiple Access

CPU – Central Processing Unit

DVD – Digital Versatile Disc

GB – Gigabytes

GHz – GigaHertz

GSM –Global Service for Mobile

HDD – Hard Disk Drive

IBM – International Business Machines Corporation

Kbps – Kilobits Per Second

KBps – KiloBytes per second

LAN – Local Area Network

LCD – Liquid Crystal Display

LDT – Lightning Data Transport

LED – Light Emitting Diode

MAC – Media Access Control

MB  – MotherBoard or Megabyte

MBps – Megabytes Per Second

Mbps – Megabits Per Second

MHz – MegaHertz

RAM – Random Access Memory

ROM – Read Only Memory

RPM – Revolutions Per Minute

USB – Universal Serial Bus

VPN – Virtual Private Network

WAN – Wide Area Network