WHAT IS PUFF PASTRY?
Homemade puff pastry uses butter, flour, salt and cold water to make a laminated/layered dough that can bake up into more than 500 layers of light, flaky pastry. When puff pastry—consisting of layers of rolled and folded butter and dough—is placed in the oven, the moisture in the butter and dough turns to steam and puffs the layers.
Croissant dough is another pastry dough that relies on steam for its rise. However, croissant dough contains yeast, which also contributes to the rise. Choux pastry is not a laminated dough, but it also puffs due to the eggs and moisture in its recipe.