Azide-PEG12-alcohol is widely used in bioconjugation and chemical synthesis due to its azide functional group and polyethylene glycol (PEG) spacer. The azide group enables click chemistry reactions, particularly copper-catalyzed azide-alkyne cycloaddition (CuAAC), making it valuable for attaching molecules to proteins, peptides, or other biomolecules. The PEG12 spacer enhances solubility and reduces steric hindrance, improving reaction efficiency. This compound is also employed in drug delivery systems to modify pharmacokinetics and in the development of bioconjugate vaccines. Additionally, it is used in materials science for surface functionalization and in the synthesis of complex molecular architectures.