N-Ethyl-4-nitroaniline is primarily used as an intermediate in the synthesis of dyes and pigments. It plays a crucial role in the production of azo dyes, which are widely applied in the textile industry for coloring fabrics. Additionally, it is utilized in the manufacture of certain types of inks and coatings, contributing to their color stability and intensity. In the field of organic chemistry, it serves as a building block for more complex chemical compounds, aiding in research and development of new materials. Its nitro and amino functional groups make it valuable in various chemical reactions, including nitration and reduction processes.