Waste (also known as rubbish, trash, refuse, garbage, or junk) is unwanted or unusable materials. Litter is waste which has been disposed of improperly, particularly waste which has been carelessly disposed of in plain sight, as opposed to waste which has been dumped to avoid paying for waste disposal fees.
In living organisms, waste is the unwanted substances or toxins that are expelled from them. More commonly, waste refers to the materials that are disposed of in a system of waste management.
