Book design is more relevant that one can think. When one says "Don't judge a book by its cover," the phrase should only be taken in the context of not judging a person by looks or physical appearance. However, when it comes to books themselves, it is quite natural to judge a book based on its entire packaging. This is the reason why book design is important.
Book design is defined as the art of incorporating not only the design, format and style but also the content and sequence of the components of a book to an organized whole. Hence, when one speaks of book design, one is not merely taking about the front and back cover; it entails everything about the entire book. It is true that the front cover is quite important; after all, a book is identified by its cover, as it indicates the title and the author. More often than not, it is what makes a customer pick up the book and purchase it. The back cover is also part of the design; it usually contains the summary or description of the book. There are also times when it contains the author's brief biography, or quotes from people or organizations praising the book.
The one thing seemingly overlooked in book design is the spine. What many people do not know is that the spine is an important element in cover design, just like a book's front cover. The spine is the vertical edge of a book as it stands on a bookshelf. When books are placed vertically or stacked up horizontally in a shelf, the spine is the only visible surface that contains relevant information about the book, such as the title, author and publisher. Indeed, it is a very crucial part of book design.