Biomass is the organic matter such as dead parts of plants, trees and waste materials of animals which are used as a fuel to produce energy. Biomass contains chemical energy in the form of carbon compounds.

Bioenergy is the energy produced from the biological sources like biomass. To obtain bioenergy from biomass, one method is Biogas Plant.

In the Biogas Plant, biogas which is a mixture of methane, carbon dioxide, hydrogen, and hydrogen sulphide is obtained by an anaerobic degradation of biomass. The anaerobic degradation is carried out by the anaerobic bacteria (which do not require oxygen to decompose complex organic compounds).

Wood is also a biomass and energy is produced by directly burning it, though the better way is to produce charcoal first and then use it for bioenergy to reduce smoke.