Bioethanol, a sustainable and environmentally friendly fuel produced from organic matter, offers a promising solution to the exhaustion of non-renewable fossil fuels and their negative ecological impacts. This chapter examines the potential and difficulties of bioethanol as a viable and environmentally friendly substitute for fuel. It begins by reviewing the merits and drawbacks of bioethanol compared to traditional fuels. It explores different feedstock alternatives, ranging from conventional sources such as sugarcane and maize to lignocellulosic biomass and advanced feedstocks like algae. Subsequently, a comprehensive analysis of the bioethanol production process, which includes pretreatment, hydrolysis, fermentation, and downstream processing, is presented. It meticulously dissects the intricate bioethanol production process. Each step, from pretreatment (breaking down complex plant materials) and hydrolysis (converting them into simple sugars) to fermentation (microbial conversion of sugars to ethanol) and downstream processing (purification and concentration). The chapter thoroughly analyses the environmental and sustainability factors associated with bioethanol production, such as the impact on land use, emissions of greenhouse gases, and water consumption. Additionally, it examines methods for reducing these concerns. It also explores the uses of bioethanol in transportation fuels and other industries, as well as potential advancements in production technologies and policy considerations in the future. This chapter thoroughly analyses these factors, making it a valuable reference for gaining insight into the possibilities and difficulties linked to bioethanol as a renewable fuel.