Chitosan is widely used in agriculture as a natural biostimulant and elicitor to enhance plant growth and resistance to diseases. It is applied as a seed coating or foliar spray to improve crop yield and quality. In the food industry, chitosan serves as a natural preservative due to its antimicrobial properties, extending the shelf life of perishable products. It is also used as a dietary supplement for weight management, as it can bind to dietary fats and reduce their absorption. In the medical field, chitosan is utilized in wound healing and tissue engineering due to its biocompatibility, biodegradability, and ability to promote cell regeneration. It is incorporated into bandages, sutures, and drug delivery systems. Additionally, chitosan is employed in water treatment to remove heavy metals and other contaminants through its chelating and flocculating properties. Its versatility makes it a valuable material across various industries.