Yes Illustration is set to a brief and both can fall into one another seperating the two is harder to explain. As you might know within Graphic Design there is a specialty within, called, Illustration so a Graphic Deisgner can be a Graphic Designer plus an Illustrator. It is a complicated area to seperate but if you do the theory upon the two they are different specialties, not hugely but there is a difference.
I live with two Illustration Students who I will Graduate with this summer so I kinda know a few ins and outs :) I am sorry if i have caused a problem with how i have learnt the slight difference between the two areas.
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