Graphic design uses typography, photography, iconography, and illustration to communicate ideas and to solve problems. By skillfully combining these elements, graphic designers are able to create complex messages at a glance for advertising, marketing, sales, and other company initiatives.
Well-executed graphic design ensures efficient visual communication with your target audience. As an artform, graphic design goes beyond the imagery itself, conveying thoughts and ideas which represent your brand and who you are as an organization.
References
https://en.wikipedia.org/wiki/Graphic_design
https://www.merriam-webster.com/dictionary/graphic%20design
https://www.interaction-design.org/literature/topics/graphic-design