Waste is unwanted or unusable materials.Solid waste means any garbage or refuse; sludge; and other discarded material,including solid, semi-solid resulting from industrial, commercial, mining,and agricultural operations, and from community activities from a waste water treatment plant, water supply treatment plant, or air pollution control facility.
According to United Nations Statistics Division(UNSD) it is defined as:-
Municipal Solid Waste
Municipal Solid Waste (MSW) is waste collected by or on behalf of a local authority. It comprises mostly household waste and it may include some commercial and industrial wastes. Historically, nationally the quantity of MSW has risen year on year1, presenting a growing problem for local authorities particularly as legislation, now limits (by implication2) the amount of mixed MSW that can be sent to landfill, comes into effect, becomes more stringent over time.