Storage in Computer

👉 Storage means the place where a computer keeps data and information.
👉 It stores files, photos, videos, and programs.

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🟢 Types of Storage

Computers have 2 main types of storage:

1️⃣ Primary Storage (Main Memory)

• Temporary memory

• Very fast

• Data is lost when power is OFF

Examples:

• RAM (Random Access Memory)

• ROM (Read Only Memory)

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2️⃣ Secondary Storage (Secondary Memory)

• Permanent storage

• Data is saved even after power OFF

• Slower than RAM

Examples:

• Hard Disk (HDD)

• SSD (Solid State Drive)

• Pen Drive

• External Hard Disk

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🔵 Difference Between Primary & Secondary Storage

Primary Storage	Secondary Storage
Temporary	Permanent
Very Fast	Slower
Small Size	Large Size
Example: RAM	Example: Hard Disk

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Types of Computer

Computers are classified based on size, power, and purpose.

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🟢 1️⃣ Supercomputer

• Fastest and most powerful computer

• Used for weather forecasting, space research, scientific calculations

• Very expensive

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🔵 2️⃣ Mainframe Computer

• Used in banks, railways, large companies

• Handles large amount of data

• Supports many users at the same time

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🟡 3️⃣ Mini Computer

• Smaller than mainframe

• Used in small organizations

• Supports multiple users

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🟣 4️⃣ Microcomputer (Personal Computer)

• Used at home, school, office

• Single user computer

• Example: Desktop, Laptop

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📱 Other Modern Types

🔸 Laptop

🔸 Tablet

🔸 Smartphone

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📝 Short Summary:

Type	Used For
Supercomputer	Scientific research
Mainframe	Banks & big companies
Mini Computer	Small companies
Microcomputer	Home & school

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✨ Short Definition (Exam Answer)

Computers are classified into Supercomputer, Mainframe, Mini computer, and Microcomputer based on size and power.

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HARDWARE & SOFTWARE

 

🖥️ Hardware (Computer Hardware)

👉 Hardware means the physical parts of a computer that we can see and touch.

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🟢 What is Hardware?

• Physical components of computer

• We can touch them

• Without hardware, computer cannot work

📝 Types of Hardware

1️⃣ Input Hardware – Keyboard, Mouse, Microphone
2️⃣ Output Hardware – Monitor, Printer, Speakers
3️⃣ Storage Hardware – Hard Disk, SSD, Pen Drive
4️⃣ Processing Hardware – CPU, Motherboard, RAM

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✨ Short Definition (Exam Answer)

Hardware is the physical part of a computer that we can see and touch

Software (Computer Software)

👉 Software means the programs and instructions that tell the computer what to do.
👉 We cannot see or touch software.

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🟢 What is Software?

• It is a set of instructions

• It controls the computer

• Without software, hardware cannot work

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🔵 Types of Software

1️⃣ System Software

• Controls the computer

• Manages hardware

• Example: Microsoft Windows

👉 Other examples: Linux, macOS

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2️⃣ Application Software

• Used to do specific work

• Example:

  • Microsoft Word – for typing

  • Microsoft Excel – for calculations

  • Microsoft PowerPoint – for presentations

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3️⃣ Utility Software

• Protects and maintains computer

• Example: Antivirus software

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📝 Difference Between Hardware & Software

Hardware	Software
We can touch	We cannot touch
Physical parts	Programs & instructions
Example: Keyboard	Example: Windows

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✨ Short Definition (Exam Answer)

Software is a set of programs that tells the computer what to do.

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INPUT AND OUTPUT

 

🖥️ Input & Output Devices

🔵 What is an Input Device?

👉 An Input Device is used to give data to the computer.

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⌨️ 1️⃣ Keyboard

• Used to type letters and numbers

• Has alphabet keys, number keys, function keys

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🖱️ 2️⃣ Mouse

• Used to point and click

• Helps to open files and programs

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🎤 3️⃣ Microphone

• Used to give voice input

• Records sound

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🔴 What is an Output Device?

👉 An Output Device shows the result from the computer.

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🖥️ 1️⃣ Monitor

• Shows text, pictures, videos

• Looks like a TV

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🖨️ 2️⃣ Printer

• Prints documents on paper

• Gives hard copy

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🔊 3️⃣ Speakers

• Produces sound

• Used to listen to music

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📝 Easy Difference:

Input Device	Output Device
Gives data to computer	Shows result from computer
Example: Keyboard	Example: Monitor

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Parts of Computer

A computer has 4 main parts.

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🖥️ 1️⃣ Monitor

• Looks like a TV

• Shows pictures, videos, and text

• It is an Output Device

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⌨️ 2️⃣ Keyboard

• Used to type letters and numbers

• Has many keys

• It is an Input Device

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🖱️ 3️⃣ Mouse

• Used to point and click

• Helps to open files and games

• It is an Input Device

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🖥️ 4️⃣ CPU (Central Processing Unit)

• It is the brain of the computer

• Controls all parts

• Processes data

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📝 Short 5 Lines:

1️⃣ Monitor shows output.
2️⃣ Keyboard is used to type.
3️⃣ Mouse is used to click.
4️⃣ CPU is the brain of computer.
5️⃣ All parts work together.

Internal Parts of Computer

These parts are inside the CPU cabinet (System Unit).

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🟢 1️⃣ Motherboard

• Main circuit board

• Connects all parts together

• All components are attached to it

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🔵 2️⃣ Processor (CPU Chip)

• Brain of the computer

• Processes instructions

• Works very fast

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🟡 3️⃣ RAM (Random Access Memory)

• Temporary memory

• Stores data while working

• Data is lost when power is off

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🔴 4️⃣ Hard Disk / SSD

• Permanent storage

• Stores files, videos, software

• Data stays even after power off

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🟣 5️⃣ Power Supply (SMPS)

• Gives power to all parts

• Converts electricity safely

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📝 Short Summary:

Part	Function
Motherboard	Connects all parts
Processor	Brain of computer
RAM	Temporary memory
Hard Disk/SSD	Permanent storage
SMPS	Power supply

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