Composition is a fundamental concept in children's literature that encompasses the arrangement of visual and textual elements within a book. It includes how illustrations, text placement, and page layouts interact to create a cohesive story experience. A well-composed children's book engages readers by guiding their eye through the narrative flow and enhancing the understanding of the story. Effective composition can evoke emotions, highlight key themes, and cater to different age groups, ensuring that the book resonates with its intended audience.