Pseudoplastic materials are substances that exhibit a decrease in viscosity when subjected to shear stress. This means that when they are stirred or mixed, they become thinner and flow more easily. Common examples of pseudoplastic materials include certain types of paints, ketchup, and cosmetics, which are designed to be easy to apply or pour when agitated. The behavior of pseudoplastic materials is important in various industries, as it allows for better handling and application. Understanding this property helps manufacturers create products that are user-friendly and effective. The term is often used in the context of rheology, the study of how materials flow and deform.