A coloring book is a type of book that contains line drawings or outlines of various images, designs, or patterns, intended for coloring using pencils, markers, crayons, or other coloring materials. Coloring books may feature simple or intricate designs, and may be targeted towards different age groups or interests, such as animals, cartoons, mandalas, or landscapes. Coloring books are often used as a form of relaxation or creativity, and can also be a fun activity for children or adults to engage in individually or together.