Pizza stone
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A pizza stone is a flat stone or piece of ceramic or earthenware used to evenly distribute oven heat to pizzas or other baked goods. The thermal mass and porous nature of the stone used also helps absorb moisture, resulting in a crisp crust.
Small pizza stones can be purchased to fit in any conventional cooking oven. High-end ovens sometimes offer optional pizza stones that are specifically designed for each oven model and may include a specialized heating element. A home made "pizza stone" can also be made by distributing one or two layers of unglazed tiles on top of an oven rack.
To prevent cracking of the stone by thermal shock, the pizza stone should be placed on a cold oven and heated over at least 45 minutes, and it should be allowed to cool down slowly inside the oven after switching it off.