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.
While the written word is prevalent in a Books section, there have been quite a few comics book adaptations, reprintings and other drawn stories for readers to enjoy. More information on individual comic titles can be found in the Jedi Journals Comic Book section.