Phyllo is a type of thin pastry dough used in various cuisines, particularly in Mediterranean and Middle Eastern dishes. It is made from flour, water, and a small amount of oil or vinegar, resulting in a delicate and flaky texture when baked. Commonly used in recipes like baklava and spanakopita, phyllo is layered to create a crispy exterior. Each layer is brushed with butter or oil before baking, which enhances its flavor and texture. This versatile dough can be used for both sweet and savory dishes, making it a popular choice for many culinary creations.