something you put under your drink

[Abstract Idea]

How do you call in English an object which can be used under glasses (filled with soft drinks, beer, etc.) in order not to stain tables for instance?

They look like sauces but I think they are not exactly sauces.
They are not used everywhere, but let's say at clubs or maybe some cheap restaurants.

Some can be made of plastic or be decorative as well.

[SoothingDave]

"Coasters"

[Abstract Idea]

"Coasters"

Thanks SoothingDave!

[Rover_KE]

'Beermats'

[Abstract Idea]

'Beermats'

Thanks Rover_KE !

[Raymott]

"Beer mat" is fine for something flat and cheap. They can also become quite big.
Coasters are generally small, round, and they can have a raised edge, or lip. Wooden coasters are popular tourist items; you wouldn't call those beer mats.
But there's obviously an overlap.

[Abstract Idea]

Thanks Raymott.

I reckon the word I was looking for was "coaster" and I also notice there is such overlap with "beermat" you mentioned. After such words were suggested by the posters, I checked them out in the google images, they do fit.

[BobK]

Incidentally, the word you meant to use was 'saucer'. 'Sauce' is the stuff you put on your food to make it taste more interesting (salsa). Apart from being flat and cheap, beermats are usually made of absorbent material (paper or cardboard). They're often used as advertisements, and they're used in pubs for any drink.

A coaster is also a small ship that stays near the coast. The link with a drinks mat is interesting: see Online Etymology Dictionary

b

[Abstract Idea]

Thanks BobK !

[Tdol]

A coaster is also a small ship that stays near the coast. The link with a drinks mat is interesting: see Online Etymology Dictionary

b

Not an obvious link.