This chapter contains sections titled: Introduction Lectins versus Enzymes What are Galectins, Anyway? "Neat" Lectins versus Glycosylated Lectins "Cross-Linking" of Galectins with their Specific Ligands Binding Strength and Specificity of Galectin Ligands Natural and Artificial Ligands for Galectins α-Galactoside-Containing Ligands for Galectins Binding of Some Galactose-Containing Polysaccharides to Galectins: Elisa 101 Binding of the Polysaccharides (With 1,6-α-D-Galactoside Side Residue and with 1,4-β-D-Galactoside Side Chains) to Antibodies to Galectin-1 and -3 Acknowledgments References