N,N'-Diphenylethylenediamine is primarily used as a stabilizer and antioxidant in various industrial applications, particularly in the production of rubber and polymers. It helps prevent degradation caused by oxidation, extending the lifespan of these materials. Additionally, it serves as an intermediate in the synthesis of dyes, pharmaceuticals, and other organic compounds. Its ability to act as a chelating agent also makes it useful in certain chemical processes where metal ion stabilization is required. In the field of research, it is employed in the development of new materials and chemical reactions due to its versatile properties.