Bromo-PEG3-Azide is widely used in bioconjugation and click chemistry applications due to its reactive azide group and PEG spacer. It serves as a linker to attach biomolecules, such as proteins, peptides, or antibodies, to other functional groups or surfaces. The azide group enables efficient copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions, making it valuable in drug delivery systems, biolabeling, and the development of diagnostic tools. Its PEG spacer enhances solubility and reduces immunogenicity, improving biocompatibility in biological systems. Additionally, it is utilized in the synthesis of polymer materials and surface modifications for nanotechnology applications.