Azido-PEG11-alcohol is widely used in bioconjugation and surface modification due to its azide functional group, which enables click chemistry reactions, particularly with alkynes. It is commonly applied in the development of drug delivery systems, where it serves as a linker to attach therapeutic agents to targeting molecules or nanoparticles. Its PEG (polyethylene glycol) chain enhances solubility and biocompatibility, making it suitable for creating stealth liposomes or PEGylated proteins. Additionally, it is utilized in material science for modifying surfaces of biomaterials to improve their interaction with biological systems. In research, it plays a role in synthesizing probes or sensors for studying biological processes. Its versatility also extends to the preparation of hydrogels and other biomaterials for tissue engineering applications.