A coaster, drink coaster, beverage coaster, or beermat is an item used to rest drinks upon. Coasters protect the surface of a table or any other surface where the user might place a glass. Coasters on top of a beverage can also be used to show that a drink is not finished or to prevent contamination. Coasters can also stop hot drinks from burning the table surface.

A coaster, drink coaster, beverage coaster, or beermat is an item used to rest drinks upon. Coasters protect the surface of a table or any other surface where the user might place a glass. Coasters on top of a beverage can also be used to show that a drink is not finished or to prevent contamination. Coasters can also stop hot drinks from burning the table surface.