<span>To show an important or unclear idea from the essay that is important because if something is hard to explain an illustration with captions can help make sense of the passage. :)</span>
To show an important or unclear idea from the essay.
Explanation:
Images and descriptive captions can help the reader to clarify some important points that could be misunderstood when reading the essay. Illustrations contribute with the information in a visual way. All this helps the reader to understand better what was unclear. So in that way, the author is showing his work through images.
