The primary functions of a graphic user interface (GUI) are to provide users with an intuitive way to interact with computer systems, software applications, and devices. GUIs utilize elements like icons, buttons, and menus to represent functions and facilitate actions through visual means rather than through text-based commands. This enhances usability by allowing users to navigate and operate systems more efficiently, leading to improved productivity. A well-designed GUI is key for user satisfaction and accessibility, as it caters to the diverse needs of users.