expository — intended to explain or describe something; serving to expound, set forth, or explain

a museum guide points toward a large dinosaur skeleton while gesturing expressively to explain its features. She uses her hands to show the size and shape of different bone parts to make the information clear. A group of fascinated children and adults listen intently as she describes what they are seeing. Their faces show understanding and interest as the complex information becomes accessible through her explanations. The guide's animated gestures and the audience's engaged expressions create a perfect teaching moment. information being presented in an expository manner to help others understand and learn