A paperback book is a popular format in children's literature, characterized by its lightweight, flexible paper cover and often a perfect-bound spine. These books are usually more affordable than hardcover editions, making them accessible for young readers and their families. Commonly found in both fiction and non-fiction, paperbacks can come in various dimensions and designs. They are often favored by publishers for their portability and ease of printing, making them a staple choice for school libraries and personal collections.