What is a “lappato or semi-polished porcelain tile”?

The finish on different semi-polished tiles can vary from a very slight polish on the high spots of a textured glaze to an almost fully polished surface that reveals some pits or dull areas. Often it is done to more authentically duplicate stone tile which have some natural fissures. It is also less slippery and less susceptible to visible scratches than fully polished tiles.