Biochar is the black fine-grained residue of the pyrolysis of crop biomass. It is the product of a thermochemical decomposition at moderate temperatures (350-700 °C) under oxygen-limiting conditions. This residue has a pore structure with large specific surface area, accompanied by a strong adsorption capacity. It is necessary to improve the quality of the soil, which is a key component of successful agriculture. Biochar can be added to the soil to improve soil fertility and crop productivity. Because biochar has the potential to be used for recycling trash, preserving nutrients in the soil and reducing greenhouse gas (GHG) emissions, it is crucial for carbon sequestration. We examine the many uses of biochar to ensure a sustainable and long-lasting increase in soil fertility. This chapter provides a comprehensive summary of biochar's qualities and functions in agriculture, as well as how it is produced. Additionally, biochar usage has many environmental benefits, economic benefits and a potential role to play in carbon credit systems. Researchers, farmers and academics who are interested in using biochar will find this review to be a helpful resource.