What are the types of illustration?

Advertising or Commerical Illustration - Used to sell or promote a product, service, or idea

Editorial Illustration - Used to support an editorial article in a publication (newspapers, magazines, etc)

Medical Illustration - Ranges from illustrating medical products to physical anatomy and microscopic organisms.

Fashion Illustration - Exaggerated proportions to represent the sleek and slender style of a model/high fashion/couture

Portraits - Usually realistic representations of a person

Caricatures - Exaggerating features to create a comical representation of a person

Children's Book Illustration - Usually in a whimsical style, it accompanies a children's story, and contains multiple illustrations throughout the book

Book Jacket Illustration - Single image used on the cover of a book/novel to give potential readers a feel for the book's content and increase sales