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Pottery is a word with different meanings. It can mean: a ceramic object; a ceramic material; a place were ceramic objects are made. For a long time ceramics have been used to produce useful things such as containers and tiles.
Pottery objects are made from damp clay mixed with other materials. They are then fired in a special oven called a kiln at high temperatures. Firing makes the clay hard. The potter may then apply a glaze to the surface before firing the object again. The fired glaze makes the surface of the pottery shiny, decorative and water-tight. However, some contemporary potters make objects which are not useful and are really 3D Design or sculpture.
Bare pottery objects without a glaze are called bisque. The finest pottery objects, called porcelain are made using a special clay called kaolin.