Sooo I will try to explain it shortly. Graphic designers create digital graphics, which are often turned into brochures or other branding materials. The graphics they create are used also in websites or can be published. Web designers also create graphics, but they use the world wide web. They have to make sure that sites have pretty good overall speed performance, and also they take care of the size of the files and so on. Basically, they have to turn their designs into working websites.