Which word can be used to describe material that explains something?

The word "expository" is used to describe material that aims to explain, clarify, or inform the reader about a particular topic. Expository writing is characterized by a structured approach that presents facts, offers explanations, and typically emphasizes clarity and informative content.

This type of writing is commonly found in textbooks, instructional materials, and articles that seek to educate the audience on a specific subject without inserting the author's opinions or arguments. It is designed to present information in a straightforward manner, making it accessible for understanding. The clarity and informative nature of expository material make it particularly effective for conveying complex ideas in a comprehensible way.

In contrast, other options like narrative, descriptive, and persuasive serve different purposes. Narrative focuses on storytelling, descriptive emphasizes sensory details about a subject, and persuasive aims to convince the reader to adopt a specific viewpoint or take action. Understanding these distinctions helps clarify why "expository" is the correct choice for material designed to explain something.