24 April 2026
23 April 2026
Summary
Summary
The operating system is the core software of a computer.
It helps users:
- interact with the device,
- run applications,
- manage files and memory,
- process input into output,
- keep the system working smoothly and securely.
Key terms to remember
- Operating System (OS)
- GUI
- Icon
- Menu
- Dialog box
- RAM
- Virtual memory
- Paging
- Input
- Output
- Buffer
- Spooling
- Multitasking
- Foreground
- Background
- Desktop OS
- Server OS
- Mobile OS
Revision questions
- What is an operating system?
- State three functions of an operating system.
- What is the difference between RAM and virtual memory?
- What does multitasking mean?
- Give two examples of desktop operating systems.
- What is the difference between foreground and background programs?
Features of some operating systems
Windows
- widely used,
- supports many applications and devices,
- includes built-in tools and services.
macOS
- used on Apple computers,
- user-friendly and stable,
- works well with other Apple devices.
UNIX
- a multitasking operating system,
- often used in technical and server environments.
Linux
- based on UNIX,
- popular for servers and technical users,
- available in many versions called distributions.
Chrome OS
- based on Linux,
- designed mainly for web apps,
- commonly used on Chromebooks.
Multiuser operating system
A multiuser operating system allows two or more users to run programs at the same time.
This is commonly used in:
- servers,
- organizations,
- networked systems.
Foreground and background
Foreground
The active program currently being used.
Background
Programs that are running but are not currently being used directly.
Example:
- Microsoft Word that you are typing in = foreground
- antivirus scanning quietly = background
Multitasking and single-tasking
Single-tasking operating system
Allows only one program or app at a time.
Multitasking operating system
Allows two or more programs or apps to run at the same time.
Most modern operating systems are multitasking.
Example:
You can:
- open Google Chrome,
- listen to music,
-
type in Microsoft Word
at the same time.
Buffer and spooling
Buffer
A buffer is an area of memory that stores data temporarily while waiting to be sent to an input or output device.
Spooling
Spooling means placing data into a buffer.
Example:
When you print many pages:
- the data waits in the buffer,
- the printer prints the pages one by one.
Input and output
Input
Input is any data or instruction entered into a computer.
Examples:
- keyboard,
- mouse,
- touch screen,
- microphone.
Output
Output is the processed information produced by the computer.
Examples:
- screen display,
- printer,
- speakers.
Simple flow:
Input → Processing → Output
Example:
You type words on a keyboard (input), the computer processes them, and the words appear on the screen (output).
RAM and virtual memory
RAM
RAM (Random Access Memory) is temporary memory that stores open apps, data, and instructions while the device is running.
Important points:
- More RAM usually means better performance.
- RAM is used when programs are open and active.
Virtual memory
If RAM is not enough, the OS can use part of the storage medium as virtual memory.
Paging
The process of moving data between storage and RAM is called paging.
Paging is useful, but it is slower than real RAM.
Example:
- RAM = work desk
- Storage = cupboard
- Virtual memory = extra temporary space when the desk is full
How an operating system works
The operating system is essential software that:
- manages the interaction between hardware and software,
- controls the use of memory,
- handles input and output,
- helps process instructions correctly.
Operating system functions
3. Main functions of an operating system
The operating system performs many important tasks, such as:
- starting and shutting down the computer or device,
- managing programs and apps,
- managing memory,
- coordinating tasks,
- configuring devices,
- establishing an Internet connection,
- providing file management,
- updating the operating system software,
- monitoring security,
- controlling network access.
Simple understanding:
The OS makes sure the computer works in an organized, efficient, and secure way.
4. The role of the OS when using a computer
When you use a computer to do work, the OS helps you:
- start a word processing program,
- open a file,
- add information to the document,
- save the file,
- store the file location so you can access it later.
Example:
When you open Microsoft Word and type an assignment:
- the OS runs the program,
- the OS manages memory,
- the OS helps save the file to storage.
5. User interface
The operating system provides ways for users to interact with the computer.
Important terms:
GUI (Graphical User Interface)
A visual way of interacting with a device using icons, buttons, menus, and images.
Icon
A small picture that represents a program, file, or command.
Button
A graphic you click to perform a command.
Menu
A list of related commands or options.
Submenu
A list of additional commands connected to a selected menu item.
Shortcut menu
A list of commonly used commands related to an object.
Dialog box
A box that shows options or asks for input from the user.
6. Controls in a dialog box
A dialog box may contain:
-
Option buttons (radio buttons)
Allow the user to choose one option only. -
Check boxes
Allow a yes/no choice. -
List boxes
Show a list of options for selection.
Example:
In print settings:
- choose page orientation using an option button,
- choose black-and-white printing using a check box,
- choose paper size from a list box.
Types of operating systems
1. What is an operating system?
An operating system (OS) is the main software that manages and controls a computer or mobile device.
In simple words, the OS is like the manager of the whole computer system.
Examples of operating systems:
- Windows
- macOS
- Linux
- Android
- iOS
- Chrome OS
2. Why is an operating system important?
Without an operating system:
- the computer cannot work properly,
- applications cannot run,
- users cannot easily interact with the device.
The operating system acts as a bridge between hardware, software, and the user.
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