Porcelain
;)
Porcelain tiles are made from hard, finer clays. They used to be made using a different manufacturing method which resulted in the design running all the way through the tile - but these days they are usually glazed and fired in the same way as ceramic tiles. They tend to be harder and denser than ceramic tiles.
The difference between ceramic and porcelain tiles can cause confusion. In my experience, ceramic tiles can often give the same effect as porcelain tiles but at a lower cost. However, the choice is yours, and I can give an equally beautiful result with either type of tile.