A thickener is a substance used to increase the viscosity of a liquid without significantly altering its other properties. Commonly used in cooking, thickeners help achieve a desired texture in sauces, soups, and gravies. Examples of thickeners include cornstarch, flour, and gelatin, which can create a smoother and more appealing consistency. In industrial applications, thickeners are also used in products like paints, cosmetics, and pharmaceuticals. They help improve the stability and performance of these products by preventing separation and ensuring even distribution. Various types of thickeners exist, including natural and synthetic options, each serving specific purposes.