There are a lot of Jobs that could use the skills learned in Illustrator. Persons with Illustrator skills could be an illustrator for story books. Illustrator would also be a plus in a marketing position as it would allow the person to be able to design and critique advertisements and marketing campaigns. Illustrator would be quite handy in package designing for products. Illustrator would be a plus in books and magazine design. Illustrator is usually one of the skills that a good graphic artist would learn.  Persons with Illustrator skills could design advertisements for social media and print campaigns.