Chitosan is widely used in the agricultural sector as a natural biostimulant and elicitor, enhancing plant growth and resistance to diseases. It acts as a seed coating to improve germination rates and protect against soil-borne pathogens. In the food industry, it serves as a natural preservative, extending the shelf life of perishable items by inhibiting microbial growth. It is also utilized in edible films and coatings to maintain freshness and quality of fruits, vegetables, and seafood. In water treatment, chitosan is effective in removing heavy metals, dyes, and other contaminants due to its chelating and flocculating properties. In the medical field, it is employed in wound healing products, drug delivery systems, and tissue engineering due to its biocompatibility, biodegradability, and antimicrobial properties. Additionally, chitosan is used in cosmetics for its moisturizing, anti-aging, and skin-soothing effects.