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A placemat or table mat is a covering or pad designating an individual place setting, unlike the larger tablecloth that covers the entire surface. Placemats are made from many different materials, depending on their purpose: to protect, decorate, entertain or advertise. Materials and production methods range from mass-produced and commercial, to local and traditional.
I don't really use placements for anything much more than say, the occasional heat pad mat.
But I do have a collection of them for use as food photography props.
Some are good quality and the occasional placemat looks good on the web, but is more fragile and less attractive in reality.