Cornstarch is a fine, powdery starch derived from corn kernels, commonly used as a thickening agent in sauces, soups, and desserts. Its neutral flavor and smooth texture make it ideal for creating silky, glossy finishes in gravies and puddings. Cornstarch is also a key ingredient in baking, where it helps to create a tender crumb in cakes and cookies. Its versatility and ability to thicken liquids quickly make it a pantry staple in many kitchens.