High Quality Content by WIKIPEDIA articles! Waste (also known as rubbish, trash, refuse, garbage, junk, litter, and ort) is unwanted or useless materials. In biology, waste is any of the many unwanted substances or toxins that are expelled from living organisms, metabolic waste; such as urea, sweat or feces. Litter is waste which has been disposed of improperly. Feces contain large quantities of fresh and soft texturized waste products.