Phyllo dough is a thin, unleavened pastry made from flour, water, and a small amount of oil or vinegar. It is known for its delicate, flaky texture and is commonly used in various dishes, especially in Mediterranean and Middle Eastern cuisines. The dough is rolled out into very thin sheets, which can be layered to create a crispy crust when baked. This versatile dough is often used in popular dishes like baklava, a sweet dessert made with nuts and honey, and spanakopita, a savory pie filled with spinach and cheese. Phyllo dough can be found in most grocery stores, typically in the frozen section.