Folate-PEG3-azide is widely used in bioconjugation and targeted drug delivery systems. Its folate moiety allows it to specifically bind to folate receptors, which are overexpressed in many cancer cells, making it valuable for targeting therapeutic agents to tumors. The PEG3 spacer enhances solubility and reduces immunogenicity, while the azide group enables efficient click chemistry reactions, such as with alkynes, for attaching drugs, imaging agents, or other functional molecules. This compound is particularly useful in developing folate receptor-targeted therapies, diagnostics, and research tools for studying cancer biology and cellular uptake mechanisms.