Books on writing are instructional guides that help aspiring authors improve their craft. They cover various aspects of writing, including grammar, style, structure, and storytelling techniques. Many of these books also provide exercises and prompts to encourage practice and creativity. Notable examples of books on writing include Stephen King's "On Writing," which combines memoir and advice, and William Zinsser's "On Writing Well," focusing on nonfiction. These resources aim to inspire and equip writers with the skills needed to express their ideas effectively and engage readers.