Explanation

• LED (Light Emitting Diode) is a semiconductor device that emits light when electric current passes through it.
• It is widely used in lighting, displays, electronic indicators, and screens.

Additional information:

• Energy efficiency: Up to 90% more efficient than traditional bulbs
  First discovery: H. J. Round – 1907
  Early research: Oleg Losev – 1927
  Practical LED development: James R. Biard – 1961
  First commercial production: October 1962 (Nick Holonyak)

Last verified on 12-03-2026

Explanation

DOS stands for disk operating system

It is a command-line, text-based operating system designed to manage files 

Dennis Ritchie is the father of MS-DOS.

MS-DOS was developed in 1982.

Explanation

Explanation

Maximum Transmission Unit refers to the largest size of a data packet

That can be transmitted over a network medium.

If a packet is larger than the MTU, it must be fragmented into smaller packets.

Example: Ethernet typically has an MTU of 1500 bytes.

Last updated 15-feb-2026

Explanation

GUI stands for graphical user interface

Origin: First developed at Xerox PARC in the early 1980s.

It is a type of user interface that interacts with electronic devices.

Examples: Microsoft Windows, Apple macOS, and mobile operating systems. 

Last updated 15-feb-2026

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