Book illustration refers to the creation of pictures, drawings, or graphic elements found in books that complement the text, enrich it visually, and aid in better understanding the story or information. These illustrations can enhance the appeal and enjoyment of books, especially in the case of children's books, but they are also frequently used in adult books, such as picture books, comics, or reference materials.

Book illustrators or graphic artists create images that support the book's narrative and atmosphere. These images can be black and white or in color, and they can be produced in various styles and techniques, such as pencil drawings, watercolors, digital illustrations, and more. Book illustration is a creative endeavor that can contribute to the enjoyment and effectiveness of books for readers, helping in better comprehension and memorability of the stories or information presented.