Biochar is a type of charcoal that is left over from the pyrolysis of biomass. It is a light, black residue composed of ashes and carbon. "The solid material obtained from the thermochemical conversion of biomass in an oxygen-limited environment" is the definition of biochar given by the International Biochar Initiative. Rich in pyrogenic carbon, biochar is a stable solid that can persist in soil for millennia.The idea of pyrogenic carbon capture and storage (PyCCS), or carbon sequestration using biochar, originates from the refractory stability of biochar. Given its ability to absorb carbon with little effort, it might be a way to slow down the effects of climate change. Acidic soils may become more fertile thanks to biochar, which can also boost agricultural output.