A colouring book is a book filled with black and white illustrations or outlines that are meant to be coloured in with coloured pencils, markers, or crayons. The illustrations can range from simple designs like geometric shapes or animals to more complex scenes like landscapes or intricate patterns. Some colouring books are designed specifically for children, with themes like cartoon characters or fairy tales, while others are geared towards adults with more intricate and detailed designs. Colouring books can be used as a fun and relaxing activity to relieve stress, improve focus and concentration