Diphenylamine is widely used as an antioxidant in the rubber and plastics industries, where it helps to prevent the degradation of products caused by oxidation and heat. It is also employed as a stabilizer in the production of explosives, particularly for nitrocellulose-based propellants, to enhance their shelf life and safety. Additionally, it serves as a stabilizer in fuels, such as gasoline, to prevent oxidation and gum formation. In agriculture, diphenylamine is used as a post-harvest treatment for apples and pears to prevent superficial scald, a condition that causes browning of the fruit skin during storage. Furthermore, it is utilized in the synthesis of dyes and pharmaceuticals, where it acts as an intermediate in the production of various chemical compounds. Its ability to inhibit oxidation makes it valuable in preserving the quality and longevity of materials across different industries.