Used as a key reagent in click chemistry, particularly in Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reactions, enabling efficient bioconjugation and labeling of biomolecules such as proteins, peptides, and nucleic acids. Its primary amine group allows for easy attachment to carboxylic acids or activated esters, while the azide group participates in selective cycloaddition to introduce functional tags, fluorophores, or immobilize molecules onto surfaces. Commonly employed in drug discovery, proteomics, and material science for constructing complex molecular architectures. Also utilized in the synthesis of functionalized polymers and dendrimers where controlled, modular assembly is required.