Primarily used in organic synthesis as a reagent for introducing azide groups into molecules. It facilitates the preparation of azides from alkyl halides, which are key intermediates in the synthesis of various organic compounds, including pharmaceuticals and polymers. Additionally, it plays a role in click chemistry, particularly in the formation of triazoles through azide-alkyne cycloaddition reactions. Its use extends to the modification of biomolecules, enabling the labeling and conjugation of proteins and nucleic acids for research and diagnostic purposes.