This is a broad time that covers a wide range of articles. In broad terms it means an article that isn't a news report or strictly factual. Features are more focused on literary style or point-of-view and convey human interest, colorful language, and descriptions that bring your story to life. That doesn't necessarily imply that the article is fiction with characters, a story line, and a plot. Narrative non-fiction uses the techniques of fiction writing to tell a story but also is strictly factual. You can use features in your newsletter as well as your magazine.