Azido-PEG7-OH is widely used in bioconjugation and click chemistry applications due to its azide functional group, which allows for efficient and selective reactions with alkyne groups. It serves as a linker in the synthesis of complex molecules, particularly in drug delivery systems, where it helps attach therapeutic agents to targeting moieties. Its PEG (polyethylene glycol) chain enhances solubility and biocompatibility, making it suitable for modifying biomolecules like proteins, peptides, and nanoparticles. Additionally, it is utilized in material science for surface functionalization and in the development of hydrogels and other polymeric materials. Its versatility and stability make it a valuable tool in research and industrial applications.