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Information and
Communications
Technology
GRADE 9 Lesson 1
Functions of an
Operating System
Unit 1
Computer Operations
and Fundamentals
Recall
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Before starting this lesson
Lesson learnt in Grade 7
• Read Grade 7 textbook: Page 32, Unit 2
Section 2.4
• Watch Video Lesson
Lesson Contents
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• What is an Operating System?
• Examples of Operating Systems
• Functions of an Operating System
• Quick Test
• Recap
What is an Operating System?
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•An Operating System (OS) is an example of
system software.
• The OS is the most important software in a
computer system.
• It consists of essential files and programs that
the computer needs to function correctly.
What is an Operating System?
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• An Operating System manages computer
hardware and allows interaction between the
user and the computer.
User OS Computer
Examples of Operating Systems
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• Microsoft Windows
Examples of Operating Systems
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• Mac OS
• Used by computers manufactured by a company
called Apple.
Examples of Operating Systems
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• Linux
Examples of Operating Systems
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• Android
• Used by most smartphones
Functions of an Operating System
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• It provides a user interface.
• Interface means how the user interacts with
the computer and vice versa.
Functions of an Operating System
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• Memory management
➢ It allocates memory space to programs and data that
are currently being used.
Functions of an Operating System
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• Processor management
➢ It allocates processor time (CPU time) to different
tasks being performed by the computer.
Functions of an Operating System
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• File management
➢ It manages the transfer of data and files from one
location to another.
Functions of an Operating System
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•Hardware management
➢ It controls all the devices attached to the
computer.
➢ It controls the transfer of data between devices.
Functions of an Operating System
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• System security management
➢ It monitors and controls access to programs and data
by providing usernames and passwords.
Functions of an Operating System
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• It deals with errors that occur during processing.
➢ E.g. Printer is not connected
➢ File cannot be found
Quick Test
1. A computer can function properly without
an Operating System.
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FALSETRUE
Quick Test
1. A computer can function properly without
an Operating System.
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FALSE
The OS is the most important software in the computer.
The computer cannot function without the OS.
Quick Test
2. An OS allows communication between
the user and the computer system.
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TRUE FALSE
Quick Test
2. An OS allows communication between
the user and the computer system.
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TRUE
The OS acts as a user interface between the user
and the computer.
It allows interaction between the user and the
computer.
Quick Test
3. The OS is responsible for file
management in the computer system.
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TRUE FALSE
Quick Test
3. The OS is responsible for file
management in the computer system.
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TRUE FALSE
The OS manages the transfer of data and files
in a computer system.
Quick Test
4. An example of an Operating System
is ___________ .
C. PowerPoint
A. Paint
B. Windows 10
Quick Test
4. An example of an Operating System
is ___________ .
B. Windows 10
Quick Test
5. The OS manages system security by
__________the computer.
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B. transferring files to
A. shutting down
C. monitoring access to
Quick Test
5. The OS manages system security by
__________the computer.
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C. monitoring access to
Recap
• An Operating System (OS) is a system
software that manages the computer
system.
• Examples of OS include MS Windows,
Mac OS, Linux and Android.
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Recap
• Functions of an Operating System (OS):
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OSSystem Security
Management
User Interface
Hardware Management
File Management
Memory management
Processor Management
Error Handling
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Information and
Communications
Technology
GRADE 9
