Azido-PEG6-alcohol is widely used in bioconjugation and click chemistry applications due to its azide functional group, which reacts efficiently with alkynes in copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions. This makes it a valuable tool for labeling biomolecules, such as proteins, peptides, and nucleic acids, enabling the study of molecular interactions and cellular processes. Its PEG (polyethylene glycol) spacer enhances solubility and reduces steric hindrance, improving reaction efficiency. Additionally, it is employed in the development of drug delivery systems, where it facilitates the attachment of therapeutic agents to targeting molecules. In material science, it is used to modify surfaces or polymers, introducing functional groups for further chemical modifications. Its versatility makes it a key component in research and industrial applications across biotechnology, pharmaceuticals, and nanotechnology.