This book provides a comprehensive overview of degrading enzymes specific to marine polysaccharides and explores their wide-ranging applications. It offers in-depth coverage of the structure, sources, physicochemical properties, and bioactivities of marine polysaccharides and oligosaccharides, along with advanced tools for enzyme mining, expression, and modification. By compiling recent findings and methodologies, the book serves as a valuable resource for researchers and professionals in biotechnology, marine biology, and biochemistry seeking to explore enzymatic applications in food, pharmaceutical, and environmental fields.