First we know that what is O.S, it's a main software after kernel. Kernel define as it;s path between hardware and software, it's connect the hardware with software. The all application software run over the O.S. You can use your computer without O.S but you can do one work at a time and the work is done by the text command. You can input only by keyboard only in form of binary (0,1) and there is no mouse because there is no GUI if like you can enter your name it can be done by many codes line in the form of binary. In modern computer which have O.S, You think that you can do multitasking you can use multiple app in a single time but the O.S can frequently change, the changing speed is so fast we can't catch that speed and you think that it can done at a same time because the switching between the app is so fast. In the First computer there is no O.S it can done only a single work at a time. So we need O.S because with the help of O.S we can do our work fast.
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