A croissant is a buttery, flaky, viennoiserie pastry of Austrian origin, but mostly associated with France.
Croissants are named for their historical crescent shape and, like other viennoiserie, are made of a layered yeast-leavened dough. 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.