Used in bioconjugation and labeling applications, particularly in click chemistry reactions. The azide group readily participates in copper-catalyzed azide-alkyne cycloaddition (CuAAC), enabling efficient attachment to alkyne-functionalized biomolecules such as proteins, peptides, or nucleic acids. Commonly employed in the development of probes for imaging, drug delivery systems, and surface functionalization of nanoparticles or biosensors. Also utilized in metabolic labeling studies when incorporated into lipids or fatty acid analogs for tracking biological pathways.