Biochar, a carbon-rich product created through the pyrolysis of organic materials, has gained considerable interest due to its ability to enhance soil health. It improves soil structure, increases nutrient retention, and aids in the immobilization of contaminants, making it a valuable tool in the remediation of polluted environments. Additionally, biochar’s potential for carbon sequestration contributes to its environmental benefits. This chapter discusses the mechanisms by which biochar enhances the phytoremediation process, focusing on its ability to immobilize heavy metals, improve soil structure, and promote plant growth. It elaborated on the various key factors such as biochar properties, soil type, and plant species to determine their influence on the effectiveness of remediation efforts. The interaction between biochar and different soil types, along with its impact on various heavy metals, is examined in detail. The chapter concludes with a discussion of the practical applications of biochar in sustainable agriculture and environmental management, highlighting future research directions and potential policy implications. Emphasis is placed on the need for further studies to optimize biochar use and address economic and policy challenges for widespread adoption.