This book contains contributions by world leaders in their fields and includes chapters dedicated to the structural analysis of glycans from different sources, and information related to the glycan functions in different biological process: the role of glycosaminoglycans in intercellular communication, polysaccharides as antiviral molecules, the immunomodulatory properties of helminth glycans, the role of glycans in Drosophila development, and the importance of mannoproteins for fungal biology.