This chapter highlights the importance of biofuels in multiple perspectives to explore them as a best suitable eco-friendly and sustainable alternative to fossil fuels. Rapid industrialization leads to the overconsumption of fossil fuels in order to fulfill the need for energy. However, due to the adverse environmental impacts of fossil fuels, a replacement energy source is required, one that is eco-friendly, sustainable, and economical, as well as capable of fulfilling the energy demands of industrial sectors. Therefore, researchers are working on the development of alternative renewable sources of energy that fulfill the criteria of an eco-friendly, sustainable, and economical energy source. This chapter begins by exploring the environmental and health hazards inflicted by fossil fuels and how immensely the planet needs a sustainable alternative to rectify issues such as fuel inefficiency, fluctuation in oil prices, and future energy demand. The chapter further investigates the production process, types, and specifications of biofuels. Hydrolysis, saccharification, transesterification, and fermentation are the main production processes of biofuels. Biofuels are classified into four types based on the natural source of feedstock: first-, second-, third-, and fourth-generation biofuels. They have versatile applications in different fields, such as transportation, power generation, industrial processes, etc., along with potential drawbacks and future prospects. The energy balance of biofuels emphasizes the importance of a positive energy input-to-output ratio. The important role of biofuels in the circular economy is highlighted by exploring their potential to create jobs and promote rural development. The chapter concludes by addressing the limitations and discussing the future prospects of adopting biofuels as a potential green energy source for mankind.