According to the European Union's Renewable Energy Directive, biomass is the biodegradable part of waste, products, and residues from different industries such as agriculture, forestry, fisheries, and aquaculture.
Biomass can be converted into electricity, burned to create heat, or processed into biofuels. Since biomass is a fuel type, some people use the terms biomass and biofuel interchangeably. Biomass is a renewable organic material.
Plant-, wood-, and other bio-waste are the most common types of biomass used for energy. Biomass is a solid material which can be converted to biogas (main methane) with the use of microorganisms in the absence of oxygen (a.k.a. Anaerobic Digestion).