Final answer:
A call-out box in a nonfiction text serves the purpose of providing information that is interesting but does not relate directly to the text itself. It adds visual appeal and includes supplementary facts or examples.
Step-by-step explanation:
A call-out box in a nonfiction text serves the purpose of providing information that is interesting but does not relate directly to the text itself. It is used to present supplementary or additional facts, anecdotes, or examples that are related to the main topic but not essential to the understanding of the text. These call-out boxes often add more visual appeal to the text by including relevant images, infographics, or media elements.