N-(p-Tolyl)-1-naphthylamine is primarily used as an intermediate in the synthesis of dyes and pigments, particularly in the production of azo dyes, which are widely used in the textile industry. It also finds application in the manufacturing of antioxidants for rubber and plastic products, helping to prevent degradation caused by oxidation. Additionally, it is utilized in research and development for creating specialized organic compounds with potential uses in pharmaceuticals or advanced materials. Its role in these industries highlights its importance in enhancing product durability and performance.