In computing terms, GUI (pronounced "gooey") is used to notify a set of interfaces with computing systems, that involve user-friendly images rather than boring text commands. GUI comes as a rescue to the numerous command line interfaces that have a steep learning curve which requires a lot of dedication. Moreover, GUI systems make it easy for the end users to fulfill their needs without knowing much about the underlying commands which are unnecessary for them.

Every other application in the modern world is designed with excellent and interactive graphics to attract the end users. Simplicity and Usability are the two main ingredients for a successful GUI system. The demanding feature of a GUI is to allow the user to concentrate on the task at hand. To achieve this, it must make the interaction between the human and the computer seamless. Therefore, learning to program in GUI will not only make you a successful developer but also help in getting some revenue for yourself.

At a very basic level, GUI is seen as a window consisting of the following parts: controls, menu, layout, and interaction. A GUI is represented as a window on the screen and contains a number of different controls. Controls can, for example, be labels, buttons, or textboxes. Under the top frame of the GUI window, a menu bar is highly likely to be present giving users some choices to control the application. The top frame can also have buttons for hiding, resizing, or destroying the windows which are again controls. The controls are positioned in a certain layout which is very important in a good GUI design. The interaction happens in the way of I/O devices such as mouse and keyboard. Developing GUI application revolves around defining and controlling these components and designing the area of interaction is the most challenging part of all. The correct exploitation of events, listeners, and handlers will help in developing better GUI applications. Many frameworks have been developed to support GUI development such as PySide to assist programmers that make the GUI programming easy and quick. A good user interface design relates to the user, not the system architecture.