Viscoelastic materials are substances that exhibit both viscous and elastic properties. This means they can deform when a force is applied, like a rubber band, but also have the ability to return to their original shape when the force is removed. Common examples include polymer materials, such as silicone and polyurethane, which are used in various applications from cushioning to seals. These materials respond to stress and strain in a time-dependent manner. When stretched or compressed, they may take time to return to their original form, demonstrating a combination of elasticity and viscosity. This unique behavior makes viscoelastic materials useful in industries like automotive and construction, where shock absorption and energy dissipation are important.