Light stabilizers and UV absorbers are polymers additives used to protect materials from degradation caused by ultraviolet (UV) radiation, with UV absorbers absorbing and dissipating UV light as heat, while hindered amine light stabilizers (HALS) act as radical scavengers to interrupt the degradation process. Both are critical for maintaining the appearance, mechanical properties, and lifespan of products like plastics, coatings, and adhesives.