[Music] hello students welcome to this ICT grade 9 learning session on computer operations and fundamentals today we will learn about the operating system and its functions this video lesson will cover what an operating system is examples of operating systems functions of an operating system then we will have a quick test followed by a recap of the lesson what is an operating system an operating system os is system software that manages computer hardware and allows interaction between the user and the computer the operating system is the most important software in a computer system it consists of essential files and programs that the computer requires to function let us consider some examples of commonly used operating systems the most popular one is Microsoft Windows there are many versions of Microsoft Windows the latest one is Windows 10 another operating system is Mac OS it is used in computers manufactured by the Apple company Linux is an open-source operating system it is free and can be installed on personal computers Android is a popular operating system it is used with smartphones and PC tablets now we are going to learn about the main functions of an operating system firstly the OS provides a user interface it allows interaction between the user and the computer most computers have a graphical user interface which enables the user to communicate with the computer system through menus and icons the OS is also responsible for memory management therefore it allocates memory space to programs and data furthermore the OS allocates processor time to different tasks being performed by the computer so the OS carries out processor management another function of the OS is file management it manages the transfer of data and files in the system it helps us to save and load files as well as organize storage of files this makes it easier for the user to see files using programs like the Windows File Explorer or Mac OS X finder each file has a unique name and the operating system maintains a set of look-up tables that relate file names to locations on storage drives in this example you can view the files found in Drive C using the Windows File Explorer the OS also manages hardware it controls all the peripheral devices attached to the computer moreover it controls the transfer of data between devices additionally the OS manager system security in a computer system it monitors and restricts access to programs and data it prevents unauthorized access to the system by checking usernames and passwords lastly the OS handles errors that occur during processing if necessary it informs the user through dialog boxes now let us do a quick test to evaluate what you have learnt today read the following questions carefully and answer accordingly you will have a few seconds to give you answer number one a computer can function properly without an operating system true or false the answer is false the operating system is the most important software in the computer the computer cannot function without it number two an OS allows communication between the user and the computer system true or false the answer is true the OS acts as a user interface between the user and the computer therefore it allows interaction between the user and the computer number three the OS is responsible for file management in the computer system true or false the answer is true the OS manages the transfer of data and files in a computer system number for an example of an operating system is option a paint option B Windows then Oh option C PowerPoint the answer is B an example of an operating system is Windows 10 number 5 the OS managers system security by option a shutting down the computer option B transferring files to the computer or option C monitoring access to the computer the answer is C the OS managers system security by monitoring access to the computer dear students this is the end of our quick tests I hope that you were able to get all the correct answers now it is time for a quick recap of today's lesson an operating system is a system software that manages the computer system examples of operating systems include Microsoft Windows Mac OS Linux and Android the functions of an operating system can be summarized as follows the OS acts as a user interface between the user and the computer it is responsible for memory management processor management file management hardware management system security management and error handling dear students we have reached the end of today's lesson thank you for your attention goodbye and see you soon you