Clay (real clay that comes from the ground, not a plastic product) is fired in a kiln, not "baked in a oven." After is is fired it is called pottery or ceramic.
Different types of clay fire at different temperatures and different lengths of time. Most are fired two times: first at a lower temperature and then at a higher temperature with glaze on the surface (sometimes the reverse). Some pottery does not have glaze, and some is only fired once.
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