A cat litter tray is a rectangular box or tray used to collect and contain the waste produced by cats when they defecate or urinate. It needs to be filled with cat litter, which absorbs the moisture and odors from the waste.
It is important to clean the litter tray regularly to prevent odors and maintain good hygiene. Cats can be picky about the cleanliness of their litter box, and may refuse to use it if it is not kept clean.