Chitosan oligosaccharide is widely used in agriculture as a biopesticide and plant growth enhancer. It helps improve crop resistance to diseases and pests while promoting root development and overall plant health. In the food industry, it acts as a natural preservative, extending the shelf life of perishable products by inhibiting the growth of harmful microorganisms. It is also utilized in the pharmaceutical and cosmetic industries for its wound-healing, anti-inflammatory, and moisturizing properties. Additionally, it is employed in water treatment to remove heavy metals and other contaminants due to its chelating abilities. Its biocompatibility and biodegradability make it a valuable ingredient in various eco-friendly applications.