A GUI is a collection of visual components such as text, buttons, and images that facilitates a user's interaction with software. GUIs are also used to provide feedback to players. In the case of our game, the GUI allows players to interact with our game. Without a GUI, the user would have no visual indication of how to use the game. Imagine software without any on-screen indicators of how to use the software. The following image shows how early user interfaces were anything but intuitive:

We use GUIs all the time and might not pay too close attention to them, unless they are poorly designed. If you've ever tried to figure out how to use an app on your Smartphone or could not figure out how to perform a specific action with desktop software, you've most likely encountered a poorly designed GUI.