Dough is a soft, flexible mixture made by combining flour with water or other liquids, along with other ingredients like yeast, salt, and sugar. It serves as the base for various baked goods, including bread, pizza, and pastries. Dough can be kneaded, rolled, shaped, and baked to create a wide range of delicious treats. It's an essential component in baking, providing structure and texture to finished products while also allowing for creativity in shaping and flavoring.