Fiction books represent the stories within the Star Wars universe, also called the Expanded Universe. The adaptations of the films, the spin off novels for adults and kids all fit within this category. If it deals with the characters from the Star Wars Saga, you'll find it here.
As the title states, move adaptations present various tellings of the adventures that were presented on the silver screen. Whether it's the book based on the film, children's storybooks, scripts or radio plays, these stories will give you greater insight into the characters and events in "a galaxy far, far away."
Adapted by Brian Daley, the Star Wars Radio Dramas made good use of the medium and provided a sizable back story and the fleshing out of many "behind-the-scenes" moments.