A more thorough explanation:

Definition: A long title is a title that is longer than usual or expected. It is often used to provide more information about the content of a book, article, or other work.

Example: "The Catcher in the Rye" by J.D. Salinger is a classic novel with a long title that gives readers a sense of what the book is about: "The Catcher in the Rye: A Novel about a Young Man's Mental Breakdown."

Explanation: The example illustrates how a long title can provide additional information about the content of a work. In this case, the title not only tells us the name of the book, but also gives us a sense of what the book is about and what themes it explores.