Used in click chemistry reactions, particularly in bioconjugation and labeling of biomolecules due to its azide group reacting with alkynes via copper-catalyzed azide-alkyne cycloaddition. Serves as a building block in the synthesis of pharmaceuticals and functional materials. Employed in photoaffinity labeling to study biological interactions, where UV light triggers nitrene formation for covalent binding to target molecules. Also utilized in the preparation of fluorescent probes and sensors by incorporating the aldehyde group into larger conjugated systems.