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A croissant is a French pastry made from puff pastry in a crescent shape. It is a buttery, flaky, viennoiserie pastry inspired by the shape of the Austrian kipferl, but using the French yeast-leavened laminated dough. Croissants are named for their historical crescent shape. The dough is layered with butter, rolled and folded several times in succession, then rolled into a thin sheet, in a technique called laminating. The process results in a layered, flaky texture, similar to a puff pastry.

Source: Wikipedia