Ceramics (Greek: "keramos"] is the generic term for pottery and the durable products made from fired clay. Pottery making is one of man's oldest cultural achievements. The earliest pottery finds date from the Middle Stone Age. Ceramics have manifold uses, as building material, for storing provisions and at the same time for the creation of art works. Ceramics are classified as either coarse or fine. Coarse ceramics include tiles and roofing tiles, pipes, etc. Fine ceramics include vessels, tableware, decorative wares and art objects. Water is added to soft clay at room temperature, then the clay is allowed to dry. When completely dry, the piece is fired at very high temperatures. The fired clay body is porous and absorbs moisture. This property is dealt with by glazing the body. Glazing is, of course, also used as decoration. The porosity of ceramics can also be influenced by sintering the bodyif it is mixed with suitable fluxes. Faience (maiolica), porcelain, lead-glazed earthenware, stoneware and terracotta are subsumed under the generic term ceramics.