The primary use of a graphic card is to render images, animations, and videos for display on a computer screen. It processes and accelerates graphical output by taking data from the computer's CPU and translating it into visual information that can be viewed by users. Graphic cards are essential for gaming, graphic design, and video editing, as they significantly enhance the quality of visuals and overall performance. More advanced graphic cards also support 3D rendering and real-time graphics, making them vital for performance-intensive applications.