Biochar and modified biochar are eco-friendly materials used to clean up soil contaminated with heavy metals. Different raw materials and methods are used to make these materials, which can help remove pollutants from the soil. The properties of biochar and modified biochar are influenced by factors like the type of soil and the temperature used during production. These materials work by trapping, binding, or changing the heavy metals in the soil. Monitoring techniques are also important after using biochar for soil cleanup. Future research will focus on making these materials more effective and easier to use for environmental protection.