Pen a novel that follows the moral and psychological development of a character from youth to adulthood, and you've written a bildungsroman! Little Women by Louisa May Alcott is a great example of a bildungsroman.
This German literary term comes from Bildung, "education or growth," and Roman, "novel." You can think of this type of book as a novel that focuses on the spiritual education or psychological growth of a protagonist over time. If you love so-called "coming-of-age" books, you're already familiar with bildungsromans — and now you have a new word for them!