Non-Newtonian fluids are fluids that do not exhibit a constant viscosity. This means that their resistance to flow changes as a function of the applied force or shear rate. Some common examples of non-Newtonian fluids include:

* Ooblek: A mixture of cornstarch and water that can behave as a solid or a liquid depending on the force applied to it.

* Honey: A thick, viscous liquid that flows slowly at low shear rates but becomes more fluid when stirred or agitated.

* Toothpaste: A paste that is solid when squeezed from the tube but becomes more fluid when brushed.

* Paint: A liquid that flows easily when applied to a surface but dries to form a solid film.

* Silly Putty: A putty-like material that can be stretched and molded into different shapes.

These are just a few examples of the many different types of non-Newtonian fluids that exist. Non-Newtonian fluids are found in a wide variety of applications, including food, cosmetics, paints, and industrial lubricants.