Biomass

Biomass is organic matter derived from living, or recently living organisms. Biomass can be used as a source of energy and it most often refers to plants or plant-based materials which are not used for food or feed, and are specifically called lignocellulosic biomass.
As an energy source, biomass can either be used directly via combustion to produce heat, or indirectly after converting it to various forms of biofuel.