Biofuel is the alternative form of energy, which is derived from biological processes like anaerobic digestion, etc. It is also generated directly from plants or plant based activities like agriculture and domestic waste. Biomass is also a main provider of biofuel in liquid, gas, and solid form. The book presents researches and studies performed by experts across the globe on biofuels and their generation. The topics covered herein offer new insights in the field of biofuel energy. This book will help new researchers by foregrounding their knowledge in this branch.