A kids' coloring book is a book designed for children to color in. It typically features black and white line drawings or outlines of illustrations on each page, with plenty of white space for coloring. These books often have themes that appeal to children, such as animals, vehicles, fantasy creatures, or popular characters from books or movies. Coloring books can be educational, teaching children about shapes, colors, and different objects, or they can be purely for fun and creativity. They are a popular activity for children and can help develop fine motor skills, creativity, and concentration.