Chitosan oligosaccharides are widely used in agriculture as a plant growth enhancer and biopesticide. They stimulate plant immunity, improve resistance to diseases, and promote overall crop yield. In the food industry, they are utilized as natural preservatives due to their antimicrobial properties, extending the shelf life of perishable products, and as dietary supplements to enhance nutritional value and promote intestinal health through their prebiotic properties that stimulate the growth of beneficial bacteria in the digestive system. In the medical field, they are employed in wound healing and drug delivery systems because of their biocompatibility and ability to enhance tissue regeneration, as well as to reduce inflammation. Additionally, they are used in cosmetics for their moisturizing and anti-aging effects, improving skin health and appearance, including inhibiting acne-causing bacteria. Their ability to bind with heavy metals also makes them valuable in water treatment processes for detoxification and purification.