2-Azido-2-deoxy-1,3,4,6-tetra-O-acetyl-D-galactopyranose is an acetyl-protected derivative of 2-azido-2-deoxy-D-galactose, serving as a key building block in carbohydrate chemistry. The C2-azide group enables bioorthogonal conjugation via copper-catalyzed azide-alkyne cycloaddition (click chemistry) to form stable triazole linkages, Staudinger ligation, or reduction to the corresponding galactosamine unit. It is employed in the synthesis of oligosaccharides, glycoconjugates, glycoproteins, glycomimetics, and carbohydrate-based vaccines. Applications span bioconjugation, drug discovery, metabolic glycan labeling, and biomaterials development. The peracetylated form provides excellent stability, solubility, and handling in organic synthesis protocols.