As one enters a bookstore of a library, they will be confronted with many different types of books and novels, such as romance books, historical novels, and nonfiction books. So as one can see, there is the diversity of books published these days is very large. For example, inside of the genre of romantic books, there are many different sub-genres as well, like medieval romance, Christian romance and contemporary romance. And that is not all of them. Then moving on to other novels, there are classic books, suspense novels and stories which are set in a particular historical period. Again, that is not every single genre of fiction works which are out there, as there are many more. Then moving on to nonfiction works, to refer to some, there are biographies and detailed books on certain historical periods or events. Then there are also cook books, self-help book and so on.