This book focuses on the research on chitin, chitosan, and their derivatives and covers the related developments in the fields of textiles, wastewater treatment, biomedicine, and food industry. It discusses the natural sources, properties, characterization methods, and uses of chitin and chitosan, chitin extraction, and preparation of chitosan with different chemicals and biological methods. The book is a useful resource for scientists, professionals, and students engaged in academic and industrial research pertaining to chitin, chitosan, and polysaccharides.