Biochar a carbon-rich substance formed from the thermal breakdown of biomass, has received a lot of attention in recent years because of its potential as a sustainable additive in cement-based materials. This article provides a thorough analysis of the existing literature regarding the mechanical, thermal, and environmental characteristics of cementitious materials that contain biochar as an additive. Due to their potential to enhance the mechanical properties of concrete, biochar-infused cementitious materials have been the focus of recent research. It has been demonstrated that biochar, a carbon-rich substance created by roasting biological substances without oxygen, has a number of beneficial characteristics, including the capacity to enhancesoil fertility and sequester carbon. The addition of biochar to cementitious materials can enhance their thermal conductivity and lessen their thermal expansion coefficient in terms of their thermal characteristics. Since thermal insulation is needed in building and construction applications, they are better suited for utilisation in those environments. The environmental characteristics of cementitious materials that have biochar incorporated have also been researched. By trapping carbon dioxide during manufacture, biochar has been proven to dramatically lower the carbon footprint of cement-based compounds. The potential advantages of adding biochar to cement-based materials in terms of their mechanical, thermal, and environmental characteristics are highlighted in this review.