Polyethylenimine, branched, is widely used as a gene delivery agent in molecular biology due to its ability to condense DNA and facilitate cellular uptake. It is also employed in the development of non-viral vectors for gene therapy, offering an alternative to viral delivery systems. In the field of biotechnology, it serves as a transfection reagent to introduce nucleic acids into cells for research purposes. Additionally, it is utilized in water treatment processes as a flocculant to remove suspended particles and impurities. In the pharmaceutical industry, it acts as a drug delivery vehicle, enhancing the solubility and stability of therapeutic compounds. Its adhesive properties make it suitable for surface modification and coating applications in materials science. Furthermore, it is used in the production of paper and textiles to improve strength and durability.