Graphical User Interface (GUI)It is a visual environment for representing programs, files and options with graphical images such as icons, menus and dialog boxes on the screen. The user could select and activate/deactivate these elements by pointing and clicking with a mouse or often with the keyboard.Features of GUI:1. A pointing device allows the user to identify and select the necessary commands by moving the cursor to a certain location on the screen, e.g. Mouse, joystick etc.2. The object being manipulated remains visible on the screen before the manipulation and after the manipulation.3. WYSIWYG (What You See Is What You Get) means that a printed document is exactly a copy of what you see on the screen.4. A GUI provides adequate messages and information from time to time depending upon the application.5. Quality of reversal is the ability to revert the previous state of action. Icons represent files, folders and other applications.6. Dialog boxes, sliders, buttons, check boxes allow the user to inform computer, what to do and how to do.7. Graphical display of the current actions informs the user regarding the current action and a method to interrupt the same action by using graphical animation.