Used primarily as a plasticizer in polymers to enhance flexibility and durability, especially in polyvinyl chloride (PVC) and related plastics. It improves workability and resistance to heat and light, making it suitable for coatings, adhesives, and sealants. Also found in rubber products and cellulose esters to increase elasticity and resilience. Due to concerns over persistence and potential health effects, its use has declined in consumer products, particularly in toys and food-contact materials. Still employed in industrial applications where leaching is minimal and long-term performance is required.