Coasters are widely used to protect the table surface especially if it is glass.
Another name for coaster is drink coaster, beverage coaster or beermat.
Sharing to you some of the coasters I recently made.
Below are some of the coasters I made using the pattern from Crochet Millan with their Magnolia Mandala pattern.
The coasters below are from made for my customers. I was not able to take pictures of the other coasters I made =)