4-tert-Octylphenol is widely used as an intermediate in the production of nonionic surfactants, which are essential components in various industrial and household cleaning products. These surfactants are effective in reducing surface tension, making them valuable in detergents, emulsifiers, and wetting agents. Additionally, it is utilized in the synthesis of phenolic resins, which are employed in coatings, adhesives, and composite materials due to their durability and thermal stability. In the agricultural sector, it serves as a key ingredient in the formulation of pesticides and herbicides, enhancing their efficacy. Its role in the polymerization process is also notable, contributing to the production of plastics and rubber materials. However, its environmental impact and potential endocrine-disrupting effects have led to increased scrutiny and regulation in recent years.