Human activities in various fields of agriculture and industry cause an increasing amount of wastes. Proper and practical use of these wastes will reduce the pressure on the environment. Biochar (BCH) is a carbon substance generated by heating plant residue and trash in a condition with little or no oxygen. BCH’s unique qualities make it an appropriate soil amendment. BCH affects various physical properties, chemical properties, and soil biology and improves soil fertility. BCH increases the yield of plants by providing the needed elements. BCH is an increasing study field in agriculture and ecosystems, and as an energy source that is ecologically friendly and improves soil quality and health. It’s been extensively researched for its agriculture and ecological advantages, but there is little research on its structures and applications. This study attempts to present a summary of BCH’s effects on soil fertility.