Elastomers are polymers with elastic properties, capable of large reversible deformation under stress. They are used to improve flexibility, impact resistance, and damping in plastics, adhesives, and coatings. Major types include SBR, NBR, EPDM, silicone rubber, and thermoplastic elastomers (TPE). They play a key role in seals, tires, hoses, modified plastics, and flexible formulations.