expository

Etymology

adj

1. Serving to explain, explicate, or elucidate; expositive; of or relating to exposition.
   Practicing expository writing will teach you to explain complex concepts clearly.
   The zombie scenes are reminiscent of what you might see on a show like The Walking Dead, short bursts of extreme violence and gore punctuating expository dialogue scenes where the survivors try to figure out how they’re going to get from point A to point B. February 23, 2017, Katie Rife, “The Girl With All The Gifts tries to put a fresh spin on overripe zombie clichés”, in The Onion AV Club