The world is facing energy crisis problem today. Reliable energy sources are thus necessary to meet the present energy needs. Most of the nations are dependent on non-renewable energy sources as fossil fuels and nuclear energy. These non-renewable energy sources have several limitations and disadvantages. The sustainable development of renewable energy alternatives offer many benefits both in socioeconomic and ecological principles. Biomass comprises any organic matter of either plant or animal origin. Biomass energy is the stored solar energy, carbon and hydrogen captured initially through photosynthesis into chemical bonds as organic matter. Biomass accounted for the largest share of renewable energy resources. Biomass is a vital source of energy for household and industrial energy requirements. Biomass has always been an important energy source for the country considering the benefits it offers. Thus, the purpose of the present review paper is to focus onto detailed aspects of biomass as a source of renewable energy.