What is the target market for graphic designer?

Nowadays Graphic Designers are also focusing on Niche Marketing like they explore with their best competence on particular type of design areas like print, illustration, UX & UI, Product design for their clients. Even so many companies hire graphic design categorically . For an example in my office at Graphic Design department there are sub departments like Illustration, Image Editing (Clipping Path), Book Design, Poster Design and so on. I am an Indesign Expert and doing only Brochure and Magazine design. So my targets are young entrepreneurs whose thought process match for me. I have completed my MBA so I can fathom their Views. So target your clients is important. My friend always target corporate business other Restaurants for Menu and Food Package Cover design