Section I: Synthesis, Processing, and Functionalization 1. Introduction to Hexagonal Boron Nitride: History, Classifications, Structure, Fundamental Properties, Challenges, and Future Perspectives 2. Synthesis Methods of Hexagonal Boron Nitride 3. Exfoliation Methods and Functionalization Techniques of Hexagonal Boron Nitride Section II: Properties and Characterizations 4. Electronic and Electrical Properties of Hexagonal Boron Nitride 5. Optical Properties of Hexagonal Boron Nitride 6. Magnetic, Mechanical and Tribological Properties of Hexagonal Boron Nitride 7. Thermal Stability and Thermal Conductivity Studies of Hexagonal Boron Nitride 8. Spectroscopic and Microscopic Characterizations of Hexagonal Boron Nitride Section III: Heterostructures and Nanocomposites 9. Heterostructures of Hexagonal Boron Nitride with Other Two-Dimensional Materials: Synthesis, Properties, and Applications 10. Hexagonal Boron Nitride Based Polymer Nanocomposites: Synthesis, Properties, and Applications Section IV: Applications 11. Hexagonal Boron Nitride for Microelectronics, Nanoelectronics, and Nanophotonics 12. Hexagonal Boron Nitride Based Antifriction and Anticorrosive Coatings 13. Hexagonal Boron Nitride for Bone Tissue Engineering Applications 14. Hexagonal Boron Nitride for Wound Healing Applications 15. Hexagonal Boron Nitride in Nanomedicine Applications 16. Hexagonal Boron Nitride for Targeted Drug Delivery Applications 17. Hexagonal Boron Nitride in Catalytic and Photocatalytic Applications 18. Hexagonal Boron Nitride for Water Desalination and Wastewater Treatment 19. Hexagonal Boron Nitride for Energy Storage and Conversion 20. Hexagonal Boron Nitride in Sensing and Biosensing Applications 21. Self-extinguishing Properties and Fire-Retardant Applications of Hexagonal Boron Nitride Section V: Computational Modelling and Simulations 22. Molecular Dynamic Simulations and Computational Modelling of Hexagonal Boron Nitride Section VI: Biocompatibility, Toxicity, Environment, and Health Impact 23. Biocompatibility, Toxicity Evaluations, and Environmental and Health Impact of Hexagonal Boron Nitride