Most books are assigned categories and sub-categories, according to their subject matter by the publisher. The Category search, allows you to search for books by subject.
The main categories are listed in a box on the left of most of our webpages.
Each category has sub-categories, which in turn has sub-categories, & so on. This allows you to refine your search. for example try Children's/Children's fiction/fantasy - the list of titles in this genre will be displayed at the bottom of the page.