**5. Conclusion and future perspectives**

Chitosan is a natural polymer and has many advantages including nontoxicity, biocompatibility, and biodegradability, and it can be applied in many fields, especially in medicine. The importance of chitosan-based bionanocomposites is skyrocketing due to their numerous advantages. Because the use and potential of chitosan-based bionanocomposite expanding in a variety of industries, this paper provides a thorough examination of these issues. The negative effects of non-biodegradable materials on humans and the environment have sparked interest in biodegradable materials among scientists and environmentalists. As a result of its intrinsic qualities such as biocompatibility, biodegradability, and nontoxicity, as well as their improved structural and functional aspects, bionanocomposites have become a focus of considerable research. Bionanocomposites based on chitosan are the most popular at the moment. They have a lot of great features and advantages. This chapter primarily focuses on the properties of chitosan, and applications of chitosan-based nanocomposites. In summary,

nanocomposites based on chitosan have great potential for research and development of new nanomaterials in the future.
