Stoneware (shí) is called "stone tire porcelain" in China ancient books, also known as jar ware.
Its green body is dense and hard, and it has been completely sintered, but it has not been vitrified (as we all know, glass does not absorb water, and vitrification is almost in the state of glass), and its water absorption is still below 2%. Such a low water absorption rate is almost impermeable, and of course it is opaque and glazed.
Stoneware has high strength and good thermal stability, and many chemical stoneware and building ceramics are also stoneware. You got it?