Graphic Design in its simplest form is visual problem solving. It doesn’t matter which visual medium, print, web , mobile or video. Typography, Color Theory and Layout are just methods of addressing the problem you want to solve. The problem usually is one of “how to communicate and idea or concept”.
Visual communication is typically universal, which is why it was the first form of “writing” in ancient times through iconography. Design has intent and purpose, Art is Expressive. We combine these thing in Visual communication or Graphic Design.
We use visual art in combination with design principles to communicate information and stimulate the ideas or feelings we want people to associate with something.