The primary function of a GPU in a computer is to accelerate the rendering of images, animations, and video for display. GPUs are specialized hardware designed to process parallel tasks efficiently, making them ideal for graphics-intensive applications such as gaming, video editing, and scientific simulations. By offloading these tasks from the CPU, a GPU enhances overall system performance and enables complex visual effects. Modern GPUs also support machine learning and computational workloads, expanding their application scope beyond just graphics.