The Keyboard is one of the output units. , , , Keyboard is used to input Picture to the computer. , , , The left key of the mouse is used to click and double click., , , The right key of the mouse is used to make right click, , , On the screen, we see pictures and shapes. , , , Screen is input units., , , Operating Unit responsible responsible   for running the whole computer.     , , , Operating Unit must be connected to an electrical source.          , , , Data and information can be saved on saved on disks., , , Keyboard is used for Writing Numbers  ? , ! , + , -. , , .

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