Illustration, requires that there be an idea or concept that needs to be illustrated, I think. IKEA illustrated assembly instructions, illustrated how-to, illustrated story books, etc.
Illustration, I think, is also art. However, it may just be a technical subset of art that requires that the illustration itself be easy to identify and understand as well as consistently on-model.
Economics demands that illustrations be simple and cheaply reproducible. That is why illustration is considered lesser than most art, I think.
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