A litter pan is a small, shallow container filled with sand or other absorbent material that is used to catch and contain animal waste. It is commonly used for house training young animals such as kittens or puppies by providing them with an appropriate place to eliminate their bodily waste. The term "litter" refers to the material, usually made of wood shavings or similar materials, that lines the bottom of the pan and absorbs the animal's urine and feces.