OS
Operating system(OS) has many programs to process a computer efficiently.OS means Windows, Mac OS, UNIX, IOS and Android for example.(1)Why does a computer need OS?Windows has many applications such as Notepad and Internet Explorer.Print and save are common functions that many applications use.It is efficient if one place provides common functions. Therefore, OS is needed.Applications are able to use common functions by executing API.(API = Application Program Interface)(2)What role does OS have?①Managing hardwareApplications are able to use hardware by OS.②Providing basic functionsOS provides basic functions.③Providing file systemOS provides the structure to save files into hard disk or to
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