Poly(ethyleneimine) solution is widely used in various industries due to its unique properties. In biotechnology, it serves as a transfection reagent, facilitating the delivery of nucleic acids, genes, and proteins into cells for genetic research and therapy, owing to its strong binding affinity for DNA and RNA. In water treatment, it acts as a flocculant and chelating agent, helping to remove suspended particles, heavy metals, and clarify water. The chemical is also employed in the paper and textile industries as a retention aid and adhesion/surface modifier, improving production efficiency, particle retention, and product strength and durability. Additionally, it is used in the production of adhesives, coatings, detergents, and cleaning products, where it enhances binding strength, durability, and efficiency in dirt and stain removal. In the field of nanotechnology, poly(ethyleneimine) is utilized to modify surfaces and stabilize nanoparticles, aiding in the development of advanced materials.