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Computer Fundamental

Computer Fundamentals – Detailed Notes

1. Introduction to Computer

A computer is an electronic machine that accepts data as input, processes it according to instructions, stores it, and produces meaningful output.

Basic Functions of a Computer:

  1. Input – Receiving data

  2. Processing – Converting data into useful information

  3. Output – Displaying results

  4. Storage – Saving data for future use

2. History of Computers

Generations of Computers

  1. First Generation (1940–1956)

    • Used Vacuum Tubes

    • Example: ENIAC

    • Very large and slow

  2. Second Generation (1956–1963)

    • Used Transistors

    • Smaller and faster than first generation

  3. Third Generation (1964–1971)

    • Used Integrated Circuits (IC)

  4. Fourth Generation (1971–Present)

    • Used Microprocessors

    • Example: Intel developed the first microprocessor

  5. Fifth Generation (Present & Future)

    • Based on Artificial Intelligence

    • Example: OpenAI

3. Components of Computer System

A. Hardware

Physical parts of a computer that we can see and touch.

  • Monitor

  • Keyboard

  • Mouse

  • CPU

  • Printer

  • Hard Disk

B. Software

Programs that tell the computer what to do.

Types of Software:

  1. System Software

    • Example: Microsoft Windows

    • Controls overall computer operations

  2. Application Software

    • Example: Microsoft Word

    • Used for specific tasks

  3. Utility Software

    • Antivirus, Disk Cleanup, etc.

4. Central Processing Unit (CPU)

CPU is called the brain of the computer.

Parts of CPU:

  1. ALU (Arithmetic Logic Unit)

    • Performs calculations

  2. Control Unit (CU)

    • Directs all operations

  3. Registers

    • Temporary storage inside CPU

5. Input and Output Devices

Input Devices

Used to enter data into computer:

  • Keyboard

  • Mouse

  • Scanner

  • Microphone

  • Webcam

Output Devices

Used to display results:

  • Monitor

  • Printer

  • Speaker

  • Projector

6. Types of Computers

  1. Super Computer – Used in research and weather forecasting

  2. Mainframe Computer – Used in banks and large organizations

  3. Mini Computer

  4. Micro Computer – Desktop, Laptop

7. Memory and Storage

A. Primary Memory (Main Memory)

  1. RAM (Random Access Memory)

    • Temporary memory

    • Volatile (data lost when power off)

  2. ROM (Read Only Memory)

    • Permanent memory

    • Non-volatile

B. Secondary Storage

  • Hard Disk

  • SSD

  • Pen Drive

  • CD/DVD

8. Operating System (OS)

An Operating System is software that manages computer hardware and software resources.

Examples:

  • Microsoft Windows

  • Linux

  • macOS

Functions of OS:

  • Process management

  • Memory management

  • File system management

  • Security

9. Basic Computer Terminology

  • Data – Raw facts

  • Information – Processed data

  • Bit – Smallest unit of data

  • Byte – 8 bits

  • File – Collection of related data

  • Folder – Collection of files

10. Uses of Computer in Daily Life

  • Education

  • Banking

  • Business

  • Healthcare

  • Entertainment

  • Communication