Azido-PEG11-azide is widely used in bioconjugation and click chemistry applications. Its azide groups enable efficient and selective reactions with alkyne-functionalized molecules, making it valuable for labeling, modifying, and crosslinking biomolecules such as proteins, peptides, and nucleic acids. The PEG (polyethylene glycol) spacer provides solubility, stability, and reduced immunogenicity, enhancing its utility in drug delivery systems and therapeutic agent development. It is also employed in surface functionalization for creating biocompatible coatings on materials like nanoparticles or medical devices. Additionally, its role in polymer synthesis and hydrogel formation is significant for tissue engineering and regenerative medicine applications.