The term 'roofing sealer' is a type of product used to protect roofs from water damage. It is often made of TAR, which is a thick, sticky substance derived from coal and wood. TAR is commonly used in roofing sealers because it is waterproof and can form a strong bond with the roofing material. Roofing sealers are applied to the roof to create a barrier that prevents water from seeping into the roof and causing damage.