Tabletop protectors are items used to protect surfaces from heat and moisture. A COASTER is a round or square piece of material, usually made of cork, plastic, or metal, that is placed under a beverage to protect the surface of a table or countertop from condensation or heat. A trivet is a flat, often decorative, item made of metal, wood, or ceramic that is placed on a table or countertop to protect it from hot dishes or pans. Both coasters and trivets are used as tabletop protectors.