Biofuel is a source of energy manufactured from renewable organic materials like agricultural or human waste, decayed forest waste, etc. through intensive biological processes. Some examples of biofuels are bioethanol, biodiesel, biomass, etc. Research in biofuels cover investigations into better biofuels derived from Jatropha, fungi, animal gut bacteria, etc. Chapters compiled in this book present numerous researches in a comprehensive form in order to equip the reader with extensive knowledge related to this field of study. Topics covered herein present upcoming theories and concepts while also presenting the practical applications. As this field is emerging at a fast pace, this book will help engineers, ecologists, environmentalists, academicians and students associated with the field of biofuels and energy production.