Used as a key intermediate in click chemistry, particularly in copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions. Its azide group readily reacts with alkynes to form stable triazole linkages, making it valuable in bioconjugation, drug discovery, and polymer science. Commonly employed to functionalize molecules and surfaces with hydrophilic linkers, enhancing solubility and biocompatibility. Also utilized in the synthesis of PEG-like spacers for pharmaceuticals and diagnostic probes.