Explanation

LAN stands for local area network

It is a collection of devices connected together in one physical location

For example"

• school
• laboratory
• university campus 
• office building.

LAN covers can be small or large from home network and enterprise network

Additional Information

WAN stands for wide area network.

MAN stands for Metropolitan Area 

WANs and MANs connect many LANs together

WANs and MANs cover a large geographical area

Explanation

ARP stands for Address Resolution Protocol.

It is used in computer networks to map IP addresses to MAC addresses.

ARP works within a local area network (LAN).

It was defined in 1982 by RFC 826, which is Internet Standard STD 37.

Explanation

LED stands for Light Emitting Diode

It is a semiconductor device that emits light when current flows through it.

LED lighting products produce light up to 90%.

Invented:

H. J. Round (1907);

Oleg Losev (1927);

James R. Biard (1961);

Nick Holonyak (1962)

First production: October 1962

Explanation

• BCC stands for: Blind Carbon Copy
  • Used in: Email communication
  • Purpose: Hides recipient email addresses from other recipients

Additional information:

• CC (Carbon Copy): Recipients are visible to all
• BCC: Recipients are hidden from everyone except the sender

Last verified on 16-01-2026

Explanation

CPU stands for Central Processing Unit

• CPU is an example of hardware
• A CPU contains  A control unit and an arithmetic logic unit
• The CPU and memory are located on Motherboard.
• The motherboard holds CPU, RAM and ROM chips, etc.