B-Format is a specific book size commonly used in the publishing industry, particularly for paperback novels. It typically measures 5.1 x 7.8 inches (130 x 198 mm), making it a convenient size for readers to hold and carry. This format is popular for its balance between readability and portability, allowing publishers to produce books that are both appealing and practical. The B-Format is often associated with the UK publishing market, where it is favored for its cost-effectiveness in printing and distribution. Many well-known authors, such as J.K. Rowling and George R.R. Martin, have their works published in this format, contributing to its widespread acceptance among readers and publishers alike.