Section outline

◄Hardware Inside the Computer
►Networking Basics

    • Purpose

      In this module, you’ll learn how computers organize information and how operating systems allow users to interact with hardware and software.

      A computer is only useful if it can store, organize, and run information. Files and operating systems make that possible.

      You should understand:

      • what a file is

      • how files are organized

      • what an operating system does

      • the three major operating systems covered on the certification exam

    • What Is a File?

      A file is a collection of digital information stored on a computer.

      Files can contain many types of data, including:

      • documents
      • images
      • videos
      • software programs
      • system information

      Every file is stored somewhere on a storage device such as an SSD or HDD.

      Files allow computers to save information so it can be used later.

      File Example

      Examples of files you may already use:

      Document - .docx
      Photo - .jpg
      Presentation - .pptx
      Video - .mp4

      The part after the period is called a file extension.

      File extensions help the operating system understand what type of file it is and which program should open it.

    • File Organization

      Computers organize files using a structure called a file system.

      A file system allows the computer to:

      • store files

      • retrieve files

      • organize filesmanage file locations

      Files are usually organized into folders (also called directories).

      Think of folders like file cabinets that help organize documents.

      Example structure:

      Documents
      → Work
      → Personal
      → School

      This structure makes it easier to locate files quickly.

    • What Is an Operating System?

      An Operating System (OS) is the main software that manages the computer.

      The operating system allows the user to interact with the computer’s hardware.

      Without an operating system, the computer cannot run programs or respond to user input.

      The OS acts as the middle layer between the user and the hardware.

      It manages:

      • Files

      • Programs

      • Memory

      • Storage

      • hardware devices

    • What the Operating System Does

      The operating system performs several important functions.

      Hardware Management

      The OS communicates with hardware components such as:

      • CPU

      • RAM

      • storage devices

      • Keyboard

      • Mouse

      • monitor

      Program Management

      The OS allows software programs to run on the computer.

      Examples:

      • web browsers

      • word processors

      • Games

      • design software

      File Management

      The OS organizes files so users can save, open, delete, and move them.

      User Interface

      The OS provides the interface that allows users to interact with the computer.

      Examples include:

      • desktop environment

      • Icons

      • Windows

      • menus

    • The Three Major Operating Systems

      The certification exam focuses on three operating systems.

      Students should understand the basics of each.

      Windows

      Windows is the most widely used operating system for personal computers.

      It is developed by Microsoft and is commonly used in homes, schools, and businesses.

      Windows is known for:

      • strong compatibility with software

      • widespread use in business environments

      • extensive hardware support

      Common versions include:

      Windows 10
      Windows 11

    • macOS

      macOS is the operating system used on Apple computers.

      It is designed specifically for Apple hardware such as:

      • MacBook

      • iMac

      • Mac Mini

      macOS is known for:

      • strong integration with Apple devices

      • stable performance

      • a polished graphical interface

    • Linux

      Linux is an open-source operating system used in many environments.

      It is commonly used for:

      • servers
      • cloud infrastructure
      • cybersecurity tools
      • development environments

      There are many versions of Linux called distributions, including:

      Ubuntu
      Debian
      Fedora

      Linux is known for:

      • flexibility
      • security
      • customization

    • Important Acronyms for This Module

      OS — Operating System - Software that manages hardware resources and allows programs to run on a computer. 

      GUI — Graphical User Interface - A visual interface that allows users to interact with a computer using icons, windows, and menus.

      CLI — Command Line Interface - A text-based interface where users type commands to interact with the operating system.

      HDD — Hard Disk Drive - A storage device that stores files using spinning magnetic disks.

      SSD — Solid State Drive - A storage device that stores files using flash memory and has no moving parts.

    • Key Takeaway

      Files store digital information.

      The operating system organizes those files and allows the computer to run programs and interact with hardware.

      Without an operating system, the computer would not be usable.

◄Hardware Inside the Computer
►Networking Basics