A graphics driver is a software program that allows the operating system and applications to communicate with a computer's graphics hardware, such as a graphics processing unit (GPU). It translates the commands from the software into a language that the hardware can understand, enabling the display of images, videos, and animations on the screen. Graphics drivers are essential for optimal performance in tasks like gaming, video editing, and graphic design. They ensure that the operating system can utilize the full capabilities of the GPU, providing better graphics quality and smoother performance. Regular updates to graphics drivers can improve compatibility and fix bugs.