Explanation

HTTP stands for Hypertext Transfer Protocol.

It uses port 80 by default for non-secure web communication.

For secure HTTP (HTTPS), the default port is 443.

Last updated by NA on 15-02-2026

Explanation

• Ctrl + K → Insert Hyperlink

Additional information:

• Ctrl + P → Print
• Ctrl + F2 → Print Preview
• Ctrl + H → Replace dialog box
• Ctrl + D → Font dialog box

Last verified on 06-07-2026

Explanation

• The shortcut key for Undo (last action reverse) is Ctrl + Z in most computer systems.
• It is used to cancel the last mistake or action.

Additional information:

• Ctrl + P = Print
• Ctrl + Y = Redo
• Ctrl + S = Save
• Ctrl + C = Copy command
• Ctrl + V = Paste
• Ctrl + C = Copy
• Ctrl + X = Cut
• Ctrl + Y = Redo

Last verified on 10-06-2026

Explanation

• The Motherboard is the main circuit board of a computer.
• It holds or provides connections for the CPU, RAM, ROM, and expansion cards.
• It allows different computer components to communicate with each other.

Additional information:

• CPU → Processes instructions
• RAM → Temporary memory
• ROM → Stores permanent/basic instructions
• Expansion cards → Add extra functions to a computer

Last verified on 29-09-2026

Explanation

• Email stands for Electronic Mail.
• It is a method of sending and receiving digital messages through the internet.
• The term electronic mail has been used with its modern meaning since 1975.
• The shorter form E-mail became common around 1979.

Additional information:

Parts of a valid email address:

1. Email Prefix
2. Email Domain

Address: example@mail.com

1. example = Email Prefix
2. mail.com = Email Domain

Last verified on 16-06-2026

Explanation

• CPU stands for Central Processing Unit.
• It is the main part of a computer that processes all instructions.
• It is considered the brain of the computer system.
• It performs all calculations and decision-making tasks.
• It controls the operations of all hardware and software.
• It is located on the motherboard.

Last verified on 10-06-2026

Explanation

• MS-DOS: Microsoft Disk Operating System
• Developed by: Microsoft
• Designed for: x86-based personal computers
• Interface: Command-line interface (CLI)
• IBM version: IBM PC DOS
• DOS: A term also used for MS-DOS-compatible operating systems.

Explanation

• Definition: Uses 2 or more CPUs.
• Benefit: Faster processing.
• Main Memory: Processors usually share RAM.
• Purpose: Handles multiple tasks efficiently.

Additional information:

• Uniprocessor: One processor
• Multithreaded: Multiple threads
• Multiprogramming: Multiple programs in memory

Explanation

• Third Generation (1965–1971): Integrated Circuits (ICs)
• A small semiconductor chip, usually made of silicon.
• Contains many tiny electronic components, including transistors/MOSFETs.

Additional information:

• First Generation (1946–1959): Vacuum tubes
• Second Generation (1959–1965): Transistors
• Third Generation (1965–1971): Integrated Circuits (ICs)
• Fourth Generation (1972–1980): VLSI and microprocessors

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