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Operating System is a system software. Operating system is the software that manages all the computer’s resource. Operating system performs basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk and controlling the peripheral devices. In another word we can say, it provides interface between hardware and software. There are so many operating systems available like WIN 95, 98, 2000, XP, Vista, Win 7, WIN NT. There are two types of platform available on which operating system works i.e. GUI and CUI.

CUI (Character User Interface)

In CUI, to execute anything we need to use command. Without command not any action will perform on the screen. For GUI, only keyboard is required. E.g DOS

GUI (Graphical User Interface)

A program interface that takes advantage of the computer's graphics capabilities to make the program easier to use. A graphical user interface (GUI) is a human-computer interface that uses windows, icons and menus and which can be manipulated by a mouse and a keyboard as well. An icon is a small picture or symbol in a GUI that represents a program, a file, a directory or a device. Icons are used both on the desktop and within application programs. Commands are issued in the GUI by using a mouse, trackball or touchpad to first move a pointer on the screen to, or on top of, the icon, menu item or window of interest in order to select that object. for example, icons and windows can be moved by dragging and objects or programs can be opened by clicking on their icons.

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