**6. Conclusion**

As global fossil resources are immensely diminishing and high utilization of it causing climate pollution due to discharging of harmful gases. Lignin was assumed as useless materials in plant biomasses and same for other waste residue of lignocellulosic substrates. So a huge amount of beneficial carbon materials vanished either burning in the field or for cooking purpose. This chapter highlights that plant biomass *Composition and Role of Lignin in Biochemicals DOI: http://dx.doi.org/10.5772/intechopen.106527*

contains cellulose, hemicellulose and lignin. All of the three main components can be convert into industrially valuable products. This chapter described the accessibility of huge amount of lignin along with cellulose and hemicellulose carbons, separation methods of polysaccharides and conversion of these usable carbons to high value chemicals production. This brief information about lignin has the possibility to be extended for better depolymerization of lignin base biomasses, and a knowledge source for efficient reaction to new aromatic catabolic chemicals in the future.
