Heavy-metal-induced contamination has been one of the major pollutants, and currently being one of the most serious concerns for its ill effects on the environment, and toxicity towards humans and plants. Being persistent in the milieu for decades, these heavy metals can also seep into underground waters polluting the soil and aquifers. Contaminated water causes the physiochemical and biochemical changes affecting the plant growth and yield. Additionally, it also has a major concern with the human health effects. Hence, it is very important to find ways to remove these heavy metals efficiently from water. In recent years, different ways of remediating heavy metals from waste water have been undertaken. Biochar, a carbon-rich source is derived from the decomposition of organic wastes that has been competent adsorbent for the heavy metal from water thus, helping as an effective treatment option. An adsorbent for heavy metals, biochar has porous structure, pH value, surface function and high cation exchange. Several methods have been used to synthesise biochar with a significant physiochemical property and have been used for various chemical applications. Being an exceptional heavy metal adsorbent, biochar is also ecofriendly, least expensive and effective treatment that has a greater potential in the near future as a best option for wastewater treatment.