Book illustration is the art of creating images to accompany a text in a book. These illustrations can enhance the reader's experience by providing visual context, helping to convey emotions, or bringing characters and settings to life. They can be found in various genres, including children's books, graphic novels, and even textbooks. Illustrators use different techniques and styles, such as watercolor, pen and ink, or digital art, to create their images. The collaboration between the author and the illustrator is essential, as both work together to ensure that the illustrations complement the story and engage the reader effectively.