Poliglusam (also commonly known as chitosan) is a linear polysaccharide composed of randomly distributed β-(1→4)-linked D-glucosamine and N-acetyl-D-glucosamine. Commercial Poliglusam is derived from deacetylation of chitin contained in the shells of various sea crustaceans such as shrimps. Chitosan is easily prepared from the second most plentiful natural polymer on earth, so it is no surprise that it is being researched as a key component of so many different biomaterials. Several benefits of Poliglusam, such as biocompatibility, biodegradability, biorenewability, bioadhesivity, and nontoxicity have made them important natural polymers for pharmaceutical and cosmetic industries. Poliglusam and its derivatives are biocompatible in a wide range of applications, from hydrogels promoting angiogenesis to a bread supplement that ameliorates diabetes. Poliglusam is also used within some wound dressings to stop bleeding. In agriculture, chitosan is typically used as a natural seed treatment and plant growth enhancer, and as an ecologically friendly biopesticide substance that boosts the innate ability of plants to defend themselves against fungal infections. As a rich source of dietary fiber, chitosan is used as a food ingredient or additive.