Used in bioconjugation and click chemistry applications, it serves as a linker for attaching molecules, such as proteins, peptides, or drugs, to other entities like nanoparticles or surfaces. The azide group enables efficient reactions with alkynes via copper-catalyzed azide-alkyne cycloaddition (CuAAC), while the PEG (polyethylene glycol) chains enhance solubility and reduce steric hindrance. The carboxylic acid groups allow further functionalization, such as coupling with amines, making it versatile for creating complex biomolecular constructs in drug delivery, diagnostics, and materials science. Its water-soluble nature and biocompatibility make it suitable for biological and biomedical research.