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Biomass is the most common fuel for usage in heating purposes in domestic, commercial and industrial sectors in all developing countries. Biomass is biological material derived from living, or recently living organisms. There are a number of technological options available to make use of a wide variety of biomass types as a renewable energy source. Conversion technologies may release the energy directly, in the form of heat or electricity, or may convert it to another form, such as liquid biofuel or combustible biogas. Biogas technology makes the best possible utilization of various organic wastes, which have no or little economic value at present. Cattle dung, agricultural residue, poultry dropping, water hyacinth, human excreta may be used as raw materials for biogas plants. Biomass gasification technology is an option for supplying heat to households, hostels and hospitals, commercial sectors like restaurants, bakeries etc or small industries and distributed power generation in remote areas. The traditional cooking stoves in Bangladesh are usually mud-built cylinder with three raised points. The efficiencies of these stoves are low and vary between 5% and 10%. Improved stoves can play a significant role to better the fuel energy situation in Bangladesh. Briquette is a modern biomass fuel. It is biomass in condensed form with increased volumetric calorific value. Different types of biomasses like sawdust, rice husk may be converted to briquette.