What is Graphic Design?

What is Graphic Design to me? Honestly to me graphic design is nothing more than a form of art that I've can't make any personal connections to it because I have never done anything with it myself. Yet what I do know is that it is in everything and is used everywhere to create a memorable moment. So what I guess I'm trying to say is that until yesterday I haven't even noticed how much graphic design impacts our lives.
https://www.youtube.com/watch?v=sTi5SNgxE3U