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, pharmaceutical development, and polymer science. Commonly employed to modify biomolecules, such as proteins and nucleic acids, for labeling, imaging, or immobilization on surfaces. Also utilized in the synthesis of functional polymers and dendrimers where controlled architecture and terminal functionality are required. Its hydrophilic ethylene glycol chains enhance solubility in aqueous systems, beneficial for biological applications.