Chapter 1: Introduction to the Char, Biochar, and its Composites in Various Potential Applications - A Review Chapter 2: Char and Biochar Production: Optimal Technology, Applications and Current Limitations in the Industrial Sector Chapter 3: Char/Biochar from Plastic and Agricultural Waste as Nanofillers in Composites Chapter 4: Physical and Chemical Characterization of Char, Biochar and Its Composite Chapter 5: Characterization and Manufacturing Technology of Cellulose Nano-char as Natural Feedstocks for Advanced Carbon Materials in Soil Remediation Chapter 6: Frontier Technology of Hydrogel Biochar Composites (HBC) for Wastewater Treatments Chapter 7: Application of Char and Biochar Composites for Gas Cleaning Technology: Hydrogel Biochar Composites (HBC) Chapter 8: Emerging Development of Char and Biochar Composites for Energy Storage Chapter 9: Char as Potential Solid Fuel Chapter 10: Application of Biochar and Biochar Composites as Catalyst Chapter 11: Toxicity Screening of Char and Biochar Composites Chapter 12: Char composite-based Circular Economy