Graphic design can be used by companies to promote and sell products through advertising, by websites to convey complicated information in a digestible way through infographics, or by businesses to develop an identity through branding, among other things.
Graphic design not only makes something look good but also organizes information to help deliver a message in the most impactful way possible. When you combine the right image, and a well-written headline, professionally executed in a well-established package, then BOOM! The message hits its target.