A bed liner is a protective coating or material applied to the interior of a truck bed. Its primary purpose is to prevent damage from scratches, dents, and rust caused by transporting cargo. Bed liners can be made from various materials, including rubber, plastic, or spray-on polyurethane, each offering different levels of durability and protection. Installing a bed liner can enhance the lifespan of a truck, making it a popular choice among truck owners. Additionally, bed liners can improve the overall appearance of the truck bed and provide better traction for items being transported, reducing the risk of shifting during transit.