Porcelain tile is a type of ceramic tile that is fired at a higher temperature than standard ceramic, making it denser and less porous.
A mix of clay, minerals, and water, ceramic tiles are fired at high temperatures. Glazed styles are then treated with a liquid glass coating and fired again, creating a hard, stain- and scratch-resistant surface. Unglazed tiles are sometimes referred to as “quarry” tiles.
Thin pieces of glass sold individually or as a mosaic, sometimes with other types of tile, on a mesh backing.