N,N-Diethyl-o-toluidine is primarily used as an intermediate in the synthesis of various dyes and pigments, particularly in the production of azo dyes, which are widely employed in the textile, paper, and leather industries. Its role in dye manufacturing is crucial for achieving specific color properties and stability in the final products. Additionally, it finds application in the chemical industry as a precursor for the synthesis of other organic compounds, including pharmaceuticals and agrochemicals. In research and development, it is utilized as a reagent in organic reactions, particularly in the formation of complex molecules. Its properties also make it suitable for use in the production of corrosion inhibitors and as a stabilizer in certain chemical processes.