Bright and colorful children's books are just the beginning. Illustration can describe products or events that are yet to exist, or create eye catching imagery, maps and brands. The reader gains a better understanding when technical illustrations are used in instructions and educational texts. It is how we demonstrate the solar system and other concepts that present a photographic challenge, as well as reducing the amount of text required to explain a subject. Illustration can also be used to build unique branding positions and messages.
This article suggests illustration was the most influential art of the 20th century.