Computer System Overview

  • Computer System Overview:

    • A computer is an electronic device for processing data.

    • It converts data into useful information for humans.

  • Components of a Computer System:

    1. Hardware: Physical electronic components (e.g., Keyboard, Monitor, Mouse).

    2. Software: Programs consisting of instructions to control the computer.

    • Types of Software:

      • System Software: Operating systems (e.g., Windows, Linux).

      • Application Software: Programs for specific user tasks (e.g., document creation).

    1. Data: Information recognized by computers, processed as binary numbers.

    • Data can be transformed into user-friendly formats (text, images, sounds).

  • Looking Inside the Computer:

    • Key Hardware Types:

    1. CPU (Central Processing Unit): Processes data and controls devices.

    2. Memory: Stores data and program instructions (e.g., RAM).

      • RAM is temporary storage (volatile) for data the CPU uses during processing.

    3. Input/Output Devices: Tools for data input (e.g., Keyboard) and output (e.g., Printer).

    4. Storage Devices: Hold data long-term (e.g., Hard Disk Drives).

  • Memory Measurement:

    • Units of Memory: Bytes, Kilobytes (KB), Megabytes (MB), Gigabytes (GB), Terabytes (TB).

  • Input/Output Devices:

    • Input: Devices receiving data from users (e.g., Keyboard, Mouse).

    • Output: Devices delivering data to users (e.g., Monitor, Printer).

  • Storage Devices:

    • Types include Hard Drives, Optical Drives, SSDs (Solid State Drives).

    • Storage capacity can significantly vary (e.g., a CD-ROM: 700MB, a DVD: 4.7GB).

  • Software:

    • Software instructs the computer on executing tasks through programs.

    • Main categories: System Software vs Application Software (e.g., Microsoft Office).

  • Core Functionality:

    • The CPU handles data processing, while the RAM temporarily holds the data needed during processing activities.