Puff pastry<span> is the simplest form of laminated </span>dough<span>, with just butter folded into a basic </span>dough<span> of flour, water, and salt.</span>Croissants<span> take it one step further and add yeast and milk to the </span>dough<span>, which make the </span>pastries<span> richer, rise more, and end up more bread-like.</span>