What is the role of computer graphics in education?

Actually, computers do not need graphics cards. There are many servers that do not contain any video hardware of any kind. However, video cards are necessary if you intend to actually see what is going on - without a video card, you can not connect a monitor to the computer. A video card is required for the computer to display any sort of video content whether it be graphics or text. Graphics adapters are the only way to accomplish this.