a flat, round or rectangular surface designed to protect a table or counter from moisture typically made of cork, wood, plastic, metal, or glass may have a pattern or design on the surface may have a non-slip base to prevent it from sliding may have ridges or grooves to hold a drink securely
coaster which is a flat, round or rectangular surface coaster which has designed to protect a table or counter from moisture coaster which typically made of cork, wood, plastic, metal, or glass coaster which may have a pattern or design on the surface coaster which may have a non-slip base to prevent it from sliding coaster which may have ridges or grooves to hold a drink securely