Graphic design basically is visual problem solving using text and/or graphical elements. Your aim is to create something that is pleasing to the eye, and gets the attention of the viewer. But things can't just look cool. They have to work as well.
brochures, posters, magazine covers, magazine layout, tickets, business cards, T-shirts, signs, logos, book layout (typesetting), importing advertisements into a newspaper, websites, cd covers, dvd interactivity elements, Internet banners, flash animation, web interfaces, Powerpoint presentations, and more.