Graphical user interface (GUI) allows users to communicate with electronic devices and PCs though graphic-based components like visual icons, menus and symbols. The GUI is an important aspect of designing an eLearning course, making it easier to navigate for learners and trainers. Unlike a text-based interface where users have to type commands into a command line box to tell the computer what to do, a GUI makes it easier for them to input commands by creating visual cues that are more relatable and standardized across all devices. Most applications like Windows, OSX, iOS, Android, Microsoft Office and Adobe Photoshop are examples of GUIs. DOS is a command line.